Plenum duct type ventilating system

FIELD: in-flow ventilating systems.

SUBSTANCE: ventilating system includes ventilating unit 1, radiator unit 2, filtering unit 3 and distributing unit 4. Unit 1 includes main and reserve radial fans 6, 7 having inlet manifolds 8, impellers 9 with main and covering discs 11, 12, radial blades 10 and converging gap between manifold 8 and disc 12. Fans 6, 7 are separated by partition 17 in housing 16 for forming vortex cavities between manifold 8 and disc 12 and ducts 19. Vortex suppressing plates are mounted in said cavities. Surface area of cross sections of ducts 19. Surface area and diameter of impeller 9, distance between one wall 18 and blades 10 are mutually related by predetermined relations. When flow is directed to duct 19 of fans 6 or 7 by means of flaps 25 arranged in unit 4 or valves, it is possibly to perform maintenance of system without interrupting its operation.

EFFECT: reduced size, improved comfort of maintenance of system.

17 cl, 13 dwg

 

The invention relates to a ventilation technique, namely the inlet channel ventilation system, which can find application in industrial and civil construction, ventilation and heating and cooling plants, which have to meet increased demand reliability, reliability and uninterrupted operation.

Known aggregate supply channel AIC-5-4-VM Scientific-production enterprise "Innovent" (passport APK-ABS, 2003) [1], including the fan unit and at least a filtering unit, heater unit, distribution unit with the switching device, the fan unit has at least one building that hosts a primary or redundant fans, each with kinematically connected with the motor impeller with backward curved radial blades placed between the base and covering the disk, the axis of the impeller is located along the channel in the casing input manifold has a symmetrical curvilinear profile in longitudinal section of the casing, forming a confused gap between the surfaces of the covering disk and the inlet manifold, and a vortex cavity between the channel walls, surfaces, inlet manifold and a covering disk.

The vertical position of the height of ventilati is the R blocks with primary and secondary fans, as well as large cross-sectional area of the channel relative to the area described by the ends of the radial blades, make this setting [1] bulky, inconvenient for maintenance and operation, increase the load per unit on the mounting base installation, increase the associated metal structure and ultimately the cost of the installation.

Solved technical problem of the invention is to improve fan performance by reducing the distance relationship between the ends of the blades of the impeller and the wall of the channel to the diameter of the radial impeller. The technical result of the invention is the reduction of system size, increasing the compactness and convenience of service, as well as reducing weight and stress on the base of the installation.

The technical result is achieved due to the fact that the supply channel unit, as the closest analogue [1], includes fan unit and at least a filtering unit, heater unit, distribution unit with the switching device, the fan unit has at least one building that hosts a primary or redundant fans, each with kinematically connected with the motor impeller with backward curved radial vanes, the placement is different between the primary and covering disks, the axis of the impeller is located along the channel in the casing, the inlet manifold has a symmetrical curvilinear profile in longitudinal section of the casing, forming a confused gap between the surfaces of the covering disk and the inlet manifold, and a vortex cavity between the channel walls, surfaces, inlet manifold and a covering disk, but unlike most similar analogue [1] channel, at least one of the fans made with the cross-sectional area, passing through the impeller blades, is equal to at least 2.4 square the circle described by the ends of the blades, and the minimum distance between the at least one wall channel and the blade of the impeller is not beyond the bounds of 0.005 0.075...diameter of the impeller and vortex cavity has at least one warehousemen.

The installation is characterized by the fact that warehousemen made in the form of at least one plate mounted in front of confused gap in each of the channels.

When this plate warehouses connected to the input manifold and the wall of the channel.

The installation is characterized by the fact that the fans in the fan unit is installed at the same level relative to each other.

The installation is characterized by the fact that the fan unit contains at least two duplicate ventilate the RA.

The installation is characterized by the fact that the housing of the fan unit contains the partitions between adjacent vanes, forming with the walls of the casing channels.

Thus the rear edge of the partition is at the level of the plane formed by the external edges of the rear disk of the impeller.

The installation is characterized by the fact that the housing of the fan unit is made with a rectangular cross-sectional shape of channels.

The installation is characterized by the fact that the switching device is installed in front of the fan unit is made in the form of at least one rotary wing, fixed to the end part of the housing of the fan unit.

When this rotary shutter mounted on the wall, the axis of rotation of the leaf parallel to the axis of the septum.

In addition, the partition is installed vertically.

The installation is characterized by the fact that the rotary shutter is installed on the wall adjacent channels, for example on the side walls.

The installation is characterized by the fact that the switching device is made in the form of the air valve.

The air valve installed at the inlet or at the outlet or the inlet and outlet of each fan housing.

The installation is characterized by the fact that the heater unit contains at least two heater.

Installation characterizes the I, filter block contains at least two filters.

This distribution block located in front of the heater and fan units.

The invention is illustrated by drawings.

Figure 1 shows a sectional inlet channel unit, top view, when performing a distribution block with butterfly valve.

Figure 2 shows in section the supply duct air handling unit, top view, when performing a distribution block in the form of air valves.

Figure 3 shows the section of the supply channel unit with redundant heater and filter blocks, top view.

Figure 4 shows a section a-a in figure 1.

Figure 5 shows cross-section B-B in figure 2.

Figure 6 shows in section the fan unit, top view.

7 shows the section b-b In figure 1, 2, 3, and 6.

On Fig shown external element G in figure 1 and 2.

Figure 9 shows the external element D in figure 2.

Figure 10 shows the dependence of the coefficient of static pressure ψ the ratio S/SRKcross-sectional area of the channel and the impeller at a constant value of the coefficient of performance of the fan: ψ=f(S/SRK) at ϕ=const.

Figure 11 shows the dependence of the coefficient of static pressure ψ the ratio of B/D distance is In between the walls of the channel and the diameter D of the impeller at a constant value of the coefficient of performance of the fan: ψ =f(B/D) at ϕ=const.

On Fig presents the dependence of the coefficient of static pressure ψ from performance factor ϕ without warehouses and multiple-choice run warehouses.

On Fig presents the dependence of the static pressure on the productivity of ventilation unit with two fans: Psν=f(Q).

Implementation of the invention.

Inlet channel unit has a fan unit 1 heater unit 2, the filter unit 3, control unit 4 may be mounted input unit 5 (Fig 1, 2, 3) and block air humidification (Fig. not shown). The fan unit 1 includes a base 6 and at least one backup 7 radial fan, each of which contains the inlet manifold 8, the impeller 9 with radial backward curved blades 10 attached between the base 11 and top 12 disks (1, 2, 3, 6), between the surfaces of the inlet manifold 8 and the covering disk 12 is formed confused gap 13 (Fig). The impeller 9 is kinematically connected, for example, through the hub 14 to the engine 15, and the working and redundant fans 6, 7 are equipped with their own engines 15. The fan unit can be performed with several fans 6 and/or 7, each of which has its own housing (Fig. not shown), and is also when placing the fan 6, 7 in a common housing 16, baffles 17, between adjacent vanes 6 and 7 (6, 7). Between the surfaces of the walls 18 of the housing 16 (Fig.9) and the partition walls 17 are formed channels 19 and between the surfaces of the inlet manifold 8, a covering disk 12 and wall 18 of the housing 16 of the vortex cavity 20 (Fig 1, 2, 3, 6). In the vortex cavity 20 is installed wirelessely made, for example, in the form of plates 21 connected with the walls 18 and/or with the input of the collector 8 (figure 4, 5, 8). The area of S passing through the blades 10 of the cross-section of each channel 19 is not less than the 2.4 square SRKthe circle described by the ends of the vanes 10 corresponding to the impeller 9, the minimum distance between the at least one wall 18 of the channel 19 and the shoulder 10 of the impeller 9 is in the range of 0.005...0,075 diameter D of the circle described by the ends of the blades 10 of the impeller 9 (hereinafter - impeller diameter): S/SRK≥2,4, 0,005≤C/D≤0,075. When the location of the impeller 9 at equal distances from the walls 18 of the housing 16, the distance B=D+2C between the walls 18 channel 19 in the housing 16 in the cross section passing through the vanes 10 of the impeller 9, is 1.01≤B/D≤1,15. However, as research has shown, the channels 19 can be performed with different shape and contour of the cross-section (rectangular, circular, polygonal and the like).

<> Heater unit 2 includes a housing 22, at least one heater, which contains the heating elements 23 made, for example, in the form of teploelektronagrevatel (ten) (1, 2, 3, 4, 5), steam or water header and the like (Fig. not shown). Heater unit 2 is connected to the fan unit 1 via flexible spacers (Fig. not shown) and may be as front and rear of the fan unit 1.

The filter unit 3 is accommodated in the housing 24 filters and is, as a rule, in front of heater unit 2 1, 2, 3, 4, 5).

Distribution block 4 is used to control the air supply to the fans 6, 7, and is fitted with a device that can be in the form of rotary shutters 25 (1, 6), the air valve 26 (figure 2, 3, 5) and other overlapping section of the channel 19 of the device. The distribution device can be placed in front of the entrance of the collector 8 (1, 6), at the outlet of the fan (figure 2, 3, 5), and before the heater and filter blocks. Thus, the rotary shutter 25 of the switchgear is located generally in front of the entrance reservoir 8 and is connected to the wall 17 or with the walls 18 adjacent channels 19, for example with the side walls 18. Air valves 26 distribution device can be placed in front of the entrance is ollection 8 and at the outlet of the fan 6, 7, at the same time and at the entrance (in front of the entrance reservoir 8), and at the outlet of the housing 16 of the fan or in front of the heaters 2 and/or filter 3 blocks.

The fan unit can be equipped with multiple coils and filters, placed in the corresponding block 2, 3 (figure 3). When you fan the installation may have one or more ducts connecting the respective heaters and fans. The ventilation device can be equipped with nozzles 27 and 28 for connection with the supply and exhaust air in the network of ducts (Fig. not shown). If there are multiple coils and/or filters distribution block 4 is located in front of the fan 1 and heater 2 blocks, and can also be equipped with multiple distribution devices for supply air from the heater to the appropriate fan 6, 7 (Fig 3).

Blocks 1, 2, 3, 4 can be interconnected by means of connecting elements, or be mounted on a common frame 29 (figure 5). This housing 16, 22, 23 of the fan 1, truck 2, filter 3, switch 4, input 5 and other units equipped with connection nodes (Fig. not shown) to the frame 29.

In a preferred embodiment, the heater unit 2 is installed in front of the fan unit 1 and connected with it by RA is concerning switch power unit 4. Front heater unit installed filter 3 and input 4 blocks after the fan unit 1 unit humidification (Fig. not shown). The fan unit 1 is made to work 6 and 7 duplicate fans, installed in a common housing 16 at the same level with each other and separated by a partition 17 to form two channels 19 of rectangular cross section with dimensions a and b and two vortex cavities 20, which posted wirelessely made in the form of plates 21. Wall 18 channel 19 with greater length and the partition wall 17 is installed vertically, the area S of the cross section of each channel 19 is 3.0...3.5 square SPKinstalled in the channel 19 of the impeller 9 and the channel width B=D+2C≤2,05D channel 19, and the ends of the blades 10 equidistant from one pair of opposite walls 18 of the housing 16 of each of the fans 6, 7 at a distance not to exceed 0,025 impeller diameter D: C≤0,025D (Fig.7), and the axis of rotation is along the channel 19. Rotary door 25 is connected to the partition 17, which ends at the level of the plane of the edges of the main disc 11.

Supply air handling unit operates as follows.

Rotary door 25, pivotally connected to the partition wall 17 and the wall 18 of the housing 16 (Fig 1), or the air valve 26 installed, for example, at the exit of ventilator is 2, 3), or air valves 26, installed in front of the entrance and at the exit from the housing 16 of the fans 6, 7, block one or more channels 19 redundant fans 7, include motors 15 of one or more major fan 6, which are separated by partitions 17 include respective heaters are equipped with heating elements 23 made, for example, in the form of teploelektronagrevatel, open the appropriate air valves (Fig. not labeled) of the input unit 5. The air sucked by the fan 6, passes through the respective air valves of the input unit 5, the filters of the filter unit 3, is heated by the heating elements 23 hot-air heating unit 2, the corresponding duct is routed to the input manifold 8 and enters the impeller 9 of the fan 6.

In the impeller 9 rotary top disk 12 creates a circular swirling motion of the air in the vortex cavity 20. Over at the outlet of the impeller 9 has a kinetic energy of rotation and generates a dynamic pressure ρu2/2, where ρ is the air density, u is the peripheral speed of the ends of the blades 10 at the outer diameter of the impeller 9. Part of the flow coming from the impeller 9, sucked into the vortex cavity 20 and interacting with the annular vortex forms in her maroobra the economic whirlwind. Introduction vortex cavity wiregates made, for example, in the form of plates 21, located in front of the confused gap 13 (figure 4, 5, 8), allows you to destroy the toroidal vortex and convert it to full pressure in the static pressure Psν. Due to the difference of the static pressure in the vortex cavity 20 and the inner surface of the covering disk 12 is formed an annular jet of air flowing from the annular confused gap 13 on the inner surface of the covering disk 12. If this is delayed boundary layer separation (flow) on the inner surface of the covering disk 12, which allows to increase the width H of the blades 10 (equal to the distance between the ends of the blades 10 at the junction with the main 11 and top 12 discs, 4, 5), up to 0.38 diameter D of the impeller 9 (H=0,38D), without compromising aerodynamic performance of the fan. Studies have shown that when the ratio of the area S of the cross-section of the channel 19 to the area of SPKlocated therein the impeller 9, is equal to S/SRK≥2,4, in the plane perpendicular to the axis of symmetry of the input manifold 8 in the setup of the impeller 9, the flow behind the impeller 9 expands and its velocity decreases, resulting in changes in the intensity of growth factor ψ static pressure (equal to the ratio of static the ski pressure Psν to the product of air density on the square of the peripheral speed of the impeller blades ψ=2Psν/ρu2) when S/SPK≥2,4.

So, from the graph ψ=f(S/SRK) at ϕ=const (figure 10), it follows that for a constant value of the coefficient of performance ϕ=Q/uSPK(where Q - fan capacity) with increasing S/SRKincreases the rate ψ. The shape of the cross section of the channel 19 has little effect on pressure recovery that allows you to perform channel 19 different forms. The decrease of the distance of the ends of the blades 10 from the walls 16 of the channel 19, as follows from the graph ψ=f(C/DRK) figure 11 leads to a slight decrease in the ratio of total pressure at high flow coefficients ϕ. Accommodation in the vortex cavity 20 varahamihira made, for example, in the form of plates 21, as shown in Fig, leads to an increased ratio of total pressure ψand growth factor ψ compensates and exceeds the pressure loss due to the approximate position of the end of the blade 10 from the wall 16. This allows the fans to a very small distance of the ends of the blades 10 of the impeller 9 of the wall 18, limited technological manufacture errors of the channel 19, the impeller 9 and the amplitude of its vibrations, up to a distance of C=(0,005...0,075)D. When performing case with PR is mogannam cross-section of the channel 19 and the location of the impeller 9 at equal distances from the walls 18 channel 19 distance B=D+2C is 1.01≤ B/D≤1,15. Moreover, when removing the ends of the blades 10 from the wall 16 at a distance of more than C≥0,075D pressure loss stop that allows you to run the fan without varahamihira. In this case, as shown in the graph Psν=f(Q) on Fig, the mutual influence of adjacent fans is practically absent, so you can distribute presented on figure 10, 11, 12 results in two or more closely spaced fans 6, 7. Thus, it is possible to reduce at least one transverse dimensions of the fan unit 1 and the fans 6, 7 in a common housing 16 with vertical walls 18 of the greater length of the channel 19 and separating the fans partitions 17 allows you to place the work 6 and 7 duplicate fans on the same level, i.e. next to each other on a horizontal plane. Due to the small length In the short side of the channel 19, the fans 6, 7 slightly exceed the width of the fan unit and substantially less than the height of the inlet duct of the air handling unit, presented in the closest analogue [1]. In addition, the location of the fans 6, 7 on one level reduces the load on the installation base. You can also connect fans along the short sides of the channel 19 (not shown)that helps to visibly reduce the mounting height.

When you stop working fan 6 (from the and failure, for preventive maintenance and for other reasons) by turning the sash 25 or located at the inlet and outlet in the housing 16 of the air valve 26 distribution device (2, 5) block the channel 19 of the working of the fan 6 and open the corresponding channel 19 redundant fan 7, then turn the engine 15 redundant fan 7, and the installation continues. Thus, the presence of duplicate fan 3 increases the reliability of the fan unit and the air valve 26 at the inlet and the outlet of the housing 16 allows the repair and maintenance of one of the fans (in this case, the fan 6) without interrupting ventilation unit.

Equipment installation backup heaters and/or filters placed in the corresponding block 2 and 3, allows for the repair and preventative maintenance workers heaters and filters without interrupting the supply duct of the air handling unit. The result is improved reliability of the entire installation, which is important for ventilation, and other industrial premises with high requirements of reliability, reliability and uninterrupted operation. In addition, the presence of duplicate fan 7 and the heater (3) provides for the simultaneous operation together with the workers of ventilat the Rami 6 and the heating elements 23 improving plant performance. The lack of mutual influence of neighboring fans (Fig) allows for preserving the values of static and total pressure to adjust the capacity of the ventilation unit as speed and smoothly by changing the speed of one or both of the fans 6, 7, temperature changes and humidity. Installing multiple redundant fans and heaters (Fig. not shown) extends the control range of the parameters supplied air.

Presented in the description of the totality of symptoms and the degree of disclosure of the invention sufficient to develop and manufacture the supply duct of the air handling unit with redundant fan on any computer company.

1. The supply duct air handling unit, including the fan unit and at least a filtering unit, heater unit, distribution unit with the switching device, the fan unit has at least one building that hosts a primary or redundant fans, each with kinematically connected with the motor impeller with backward curved radial blades placed between the base and covering the disk, the axis of the impeller is located along the channel in the casing, the inlet manifold is symmetric rivoliana profile in longitudinal section of the hull, forming a confused gap between the surfaces of the covering disk and the inlet manifold, and a vortex cavity between the channel walls, surfaces, inlet manifold and a covering disk, characterized in that the channel is at least one of the fans made with the cross-sectional area, passing through the impeller blades, is equal to at least 2.4 square the circle described by the ends of the blades, and the minimum distance between the at least one channel wall and the blade of the impeller, not outside of 0.005÷0,075 diameter of the impeller and vortex cavity installed at least one warehousemen.

2. Installation according to claim 1, characterized in that warehousemen made in the form of at least one plate mounted in front of confused gap in each of the channels.

3. Installation according to claim 2, characterized in that the plate warehouses connected to the input manifold and the wall of the channel.

4. Installation according to claim 1, characterized in that the fans in the fan unit is installed at the same level relative to each other.

5. Installation according to claim 5, wherein the fan unit includes at least two redundant fan.

6. Installation according to claim 1, characterized in that the housing of the fan unit contains the partitions between adjacent fans, clicks the user with the walls of the casing channels.

7. Installation according to claim 6, characterized in that the rear edge of the partition is at the level of the plane formed by the external edges of the rear disk of the impeller.

8. Installation according to claim 1 or 6, characterized in that the housing of the fan unit is made with a rectangular cross-sectional shape of channels.

9. Installation according to claim 1, characterized in., that the switching device is installed in front of the fan unit is made in the form of at least one rotary wing, fixed to the end part of the housing of the fan unit.

10. Installation according to claim 9, characterized in that the rotary shutter mounted on the wall, the axis of rotation of the leaf parallel to the axis of the septum.

11. Installation according to claim 10, characterized in that the partition is set vertically.

12. Installation according to claim 9, characterized in that the rotary shutter is installed on the wall adjacent channels, for example on the side walls.

13. Installation according to claim 1, characterized in that the switching device is made in the form of the air valve.

14. Installation according to item 13, wherein the air valve installed at the inlet or at the outlet or the inlet and outlet of each fan housing.

15. Installation according to claim 1, wherein the heater unit includes at least two heater.

16. Installation according to claim 1, characterized who eat filter unit has at least two filters.

17. Installation according to claim 1 or 15, or 16, characterized in that the distribution unit located in front of the heater and fan units.



 

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