Vortex air cooler with permanent removing of frost

FIELD: heat-exchange apparatus.

SUBSTANCE: air cooler comprises vortex heat exchangers, pipes of the vortex heat exchangers for flowing air to be cooled flows, swirlers, and actuator of purifying mechanisms. The actuator has hollow driving shaft mounted in the pipes and provided with a longitudinal groove throughout its length. The groove receives unmovable screw with a nut coupled with the bushing freely mounted on the shaft through a key. The brush holder with brushes are secured to the bushing. The outer side of the pipes of the vortex heat exchangers are provided with chutes for circulating a coolant. The vortex heat exchangers has a fining with a coefficient that varies according to the relationship where D is the diameter of the pipe, n is the number of chutes, and l is the chute width. The parameters vary in the following range: D = 50-800 mm and l = 20-50 mm. The chute height l1 =3-40 mm, the thickness of the pipe wall and the thickness of the chute wall

EFFECT: simplified structure and enhanced reliability.

5 cl, 7 dwg

 

The invention relates to refrigeration and can be used on distribution refrigerators, fridges, meat and fruit processing industry.

Known vortex coolers with continuous removal of frost, where the air is in each element of the air cooler whirls special axial fan (see A.S. No. 235049, USSR).

The presence of a large number of elements requires a corresponding number of axial fans that conditions in cooling chambers with moist air due to frequent failure of the fan motors. Therefore expedient are the coolers with the minimum possible number of fans.

The prototype is a vortex cooler with a device for removing frost from the inner surface of the pipe by A.S. SU 1808111, F 25 D 21/06, 07.04.1993,

The vortex cooler is a heat exchanger in the form of a pipe, which is arranged outside of the gutter or shirt, in which the boiling refrigerant. At the entrance to the pipe is a special axial fan whirling air flow. Swirling stream of air moving inside the pipe and is cooled. Upon cooling of moist air in the cells of refrigerators at temperatures from it falls on the cold inner surface of ruby moisture in the form of crystals of frost. Deposited on the inner surface of the pipe frost affects the heat transfer, which entails additional energy costs.

To remove frost from the inside of the tube inside her mounted device containing the drive shaft is installed with the opportunity to interact with him a couple of screw - nut, brush holder, comprising communicated with the shaft spring pivot plate and pivotally mounted on them spring-loaded strap with clips and brushes. In addition, the device is provided with an additional brush holder, supporting means and centering devices for the shaft, the brush holders and centering device located at the ends of the shaft. Each centering device contains fixed on the shaft rods with rollers that are installed with the possibility of rolling on the inner surface of the pipe.

The device is designed so that one brush holder on each end of the shaft mounted on the rod centering device with capability of the location of the brush during rotation of the front roller.

The lack of a vortex cooler with continuous removal of frost is that with a relatively large length of the shaft of the treatment device sags, which complicates his work and, in addition, each heat exchanger must octanal is to their axial fan.

In addition, a small length of pipe uneconomical use the turbulence of the air, which greatly intensifies the heat transfer compared to once-through air flow in the pipe. Therefore, from the energy point of view of the swirling motion of the air in longer tubes for the heat exchange is more profitable.

Further, depending on operating conditions, there is a need to modify the characteristics of the vortex (the initial angle of introduction of the air flow in a pipe)that when the turbulence of the air flow blades of the axial fan is significantly more expensive than the special swirlers. It should also be noted that the cleaning mechanism is quite complex. The basis of the invention the task is improving the "Vortex cooler with continuous removal of frost" by the intensification of heat transfer, reduce capital and energy costs and simplify the design.

The problem is solved in that in the "Vortex cooler with continuous removal of frost", containing eddy heat exchangers, in which the moving cooled air swirler, the actuator treatment mechanisms of frost, which includes placed inside the said tube hollow drive shaft with a longitudinal groove along its length, which is installed inside the fixed screw with nut associated key sofobomo placed on the shaft sleeve, and fortified by the last brush holder with brushes according to the invention it provides a unifying duct and fan, with the outer surface of the vortex tube heat exchangers placed gutters, inside of which circulates the refrigerant, while eddy heat exchangers made with a coefficient of fins, changing in accordance with the equation:

,

where D is the pipe diameter; n is the number of grooves: l - width of the gutter, which, in turn, vary D=50-800 mm; l=20-150 mm, and the height of the chute l1=3-40 mm; the wall thickness of the pipe δ=1-8 mm and wall thickness gutters δ=1-5 mm

The cooler is equipped with special swirlers with whirling blades and core with a ratio of diameter equal to D/d≤10, and with the angles of twisting of the blades (the angle between the direction of the air flow and the pipe) inlet air flow α=0-70° and the output air flow β=20-70°that enable effective turbulence of the air flow on the pipe length equal to L/D≤60, where L is the pipe length, D is the diameter pipe, d is the core diameter of the swirl.

For the convenience of assembling the cleaning device of frost drive shaft and propeller are made of separate parts, and to reduce the deflection of the drive shaft and the health of the pure device inside the pipe is installed intermediate bearing.

To prevent rotation of the screw and disconnect it during work, the last extreme ends of square cross-section mounted in supports with square holes, one of the pillars is removable.

The connection shaft is splined clutch, and a connection screw screw clutch.

When gathering nuts with screw cleanup mechanism of frost, and again for its engagement with the screw, if the direction of rotation of the shaft, at both ends of the screw is installed contractile springs, which generate axial force and contribute to the normal operation of the mechanism.

To simplify the design of the cleaning device of frost, the latter is in the form of a spring, one end of which is fixed on the sleeve, and the second is provided with a brush holder with a brush.

For maintenance cleaning mechanism, and intermediate supports in the middle of the vortex heat exchangers are inspection hatches with covers.

It should be noted that the ratio of the vortex fins of heat exchangers varies in a considerable range γ=1-10.

This is caused by a large number of cases that occur in the operating conditions, namely: different cooling agents (ammonia, freon, brines of calcium chloride and sodium chloride), the terms of the strength and density of the heat exchangers, the materials of which can be accomplished by heat exchangers (black is th steel, stainless steel, aluminum alloys, which have significant differences in the coefficients of thermal conductivity), the influence of heat and humidity parameters of the cooled air (relative humidity, temperature), thermal-hydraulic processes in the gutters in the movement and heat exchange of the cooling agent.

Relative to the swirler, which also are significant ranges of geometrical parameters, it must be emphasized that these data were obtained as a result of research works aimed at obtaining optimal energy performance for processes taking place in an industrial environment.

Figure 1 shows a General view of the air cooler. Figure 2 shows the cross-section of the heat exchanger. Figure 3 and 4 shows the swirl in two projections, figure 5 shows the drill core with blades. Figure 6 shows the cleaning mechanism of frost with the inner surface of the vortex tube heat exchanger, figure 7 shows the cross-section of the cleaning mechanism.

Vortex air cooler includes a frame 1, a drive sprocket 2, the shaft 3, the swirler 4, manhole covers 5, the intermediate support 6, the heat exchanger 7, uniting the duct 8, the centrifugal fan 9 with the motor 10, the mounting frame 11, a support 12, treatment mechanisms 13, the actuator treatment mechanisms 14, VI is you're 15, pipe 16, gutters 17, swirler vanes 18, the core of the swirl 19, the outer shell of the swirler 20. In turn, the cleaning mechanism of frost inside the pipe 16 includes a hollow shaft 3 with a longitudinal groove 21 along its length, which is installed inside the fixed screw 15 with the nut 22, the associated key 23 with a freely mounted on the shaft 3 by a nut 24. The sleeve 24 is welded to cylindrical rods 25, which are mounted springs 26. At the other end of the spring set brush holder 27 with a brush 28. The sleeve 24 through 120° attached strap 29 with rollers 30, which center it on the shaft 3. The mechanism has three bearing 31, the four springs 32, the two pillars with square holes 33, the screw coupling 34, the splined connection of the two parts of the shaft 35, the intermediate slide bearing 36 mounted on the intermediate support 6, the two nuts 37, sleeve bearing 38 and 39.

Vortex air cooler works as follows. The air from the cooling chamber through the swirler 4 and eddy heat exchangers 7 is sucked by the centrifugal fan 9. When the flow of air through the swirler, the latter is twisted, and the vortex moves inside the vortex tube heat exchanger. Whirl increases the heat transfer coefficient from air to the pipe surface by more than two times compared to pamelina is the second thread with the same energy used to drive the centrifugal fan. On the outer surface of the pipe 16 is welded to the chute 17, inside of which circulates cooling agent, the cooling air. After eddy heat exchangers cool the air through uniting the duct 8, is sucked by the centrifugal fan 9 and is discharged into the camera. The fan is driven by an electric motor 10.

The cooler is installed on the frame 11. Eddy heat exchangers 7 are mounted one above the other on the supports 12. Within each vortex heat exchanger installed sewage treatment device of frost with the inner surface of the pipe 16. The treatment device of frost is driven into rotation from the actuator 14 by means of a chain drive and sprocket 2. Stars 2, mounted on the hollow shaft 3, bring it into rotation around a stationary screw 15 mounted on the frame 1.

In the middle of the vortex tube heat exchanger has a sunroof 5 with the cover for servicing the intermediate support 6 and the cleaning mechanism.

Swirl air is made of shell 20, the core 19 and twisting of the blades 18. The left part (see figure 3) the core is made in the form of a truncated cone, and the shell has a smooth manifold, all of which helps to reduce resistance to air flow when the inlet swirl it in.

When passing the swirling warm and humid air flow through the pipe 16 on its inner surface, R is the result of cooling moisture falls in the form of frost (temperatures below zero degrees), which significantly reduces the heat transfer coefficient, and hence the heat flow. At sufficiently long period of time frost reduces heat flow and the cooler it becomes useless. To restore existing finned coolers must be defrost, due to the violation of the cooling mode and labour costs. In a vortex, offered, cooler remove frost is carried out using a cleaning mechanism.

Frost with the inner surface of the pipe is removed by the brushes 28, placed in the brush holder 27. In turn, the brush holder 27 is mounted inside the compressed spring 26. The second end of the compressed spring mounted on the rod 25. Compressed spring always provides reliable contact brush 28 with the inner surface of the pipe. The rod 25 is welded to the sleeve 24. Rotational and axial movement of the brushes is transmitted from the sleeve 24, which rotates with the hollow shaft 3 and moves in the axial direction as a result of its rigid connection through the plug 23 with a nut 22, which is coupled with the screw 15. The key 23 is moved in the axial direction of profesionalnomu (along the length) of the longitudinal groove 21 of the shaft 3.

The direction of rotation (reverse) reverses the direction of the axial movement of the nut 22, and therefore, the sleeve 24 and the brushes 28. DL is the elimination of friction between the sleeve and the hollow shaft 3, and its distortions welded thereto through 120° strap 29 with rollers 30, which center it on the shaft and significantly reduce the effort to move.

A hard link bars 29 with rollers 30 and sleeve 24 and the connection sleeve by pins 23 with a nut 22 prevents the friction of the nut 22 on the inner wall in the middle of the hollow shaft (the maximum deflection of the screw), which also reduces the resistance to movement of the cleaning mechanism of frost. On the inner surface of the pipe 16 may be irregularities and protrusions in the form of misalignment when welding pipe joints, beading and droplets of metal after welding, which create significant barriers to the movement of the brushes. In this case, the presence of such a flexible element such as a compressed spring 26 allows the brushes 28 to pass through all the obstacles in the possible compression and bending springs.

When using the vortex heat exchangers great length of the hollow shaft and the screw will have a significant deflection that makes its operation. For this reason, the vortex heat exchanger provided with intermediate support 6 with the sliding bearing 36. Connection hollow shaft made in the form of the spline 35, or some other design of connections). The screws 15 are connected by a screw coupling 34.

To prevent turning of the screws and their separation, their opposite ends have a square cross section and the W ill result in the square holes of the supports 33. The screws are fixed in the bearings nuts 37.

When the failure of the reverse (not shown) in the extreme positions of the brushes in the pipe and prevent breakage of the cleaning mechanism at a certain length of the screw is not threaded, which allows the nut to go with the thread and no longer be moved in the axial direction while revolving. In this case, the nut compresses the spring 32, having axial force. If the direction of rotation of its spring force contributes to the engagement of the nut with the screw, and the cleaning mechanism is restored. The drive of the hollow shaft is a sprocket 2, which is the key installed on the bearing sleeve 38, and the sleeve is rigidly connected with the hollow shaft. The second end of the hollow shaft mounted on the sleeve 39. Taking into account the conditions required refrigeration technology, the use of those or other refrigerant (brine, ammonia, freons), strength conditions dictated by safety regulations, the metals used for the manufacture of (ordinary steel and stainless steel, aluminum alloys, copper and others), conditions of heat transfer geometrical parameters of vortex heat exchangers can undergo significant changes.

The main characteristics of the vortex heat exchanger shown in figure 1 and 2 - section a-a, And the swirler - figure 3-5.

When using the vortex coolers with mouth what Euston to remove frost from the inside of the tube significantly improve conditions for operation of the refrigeration chambers, as there is no need to conduct defrosts, reduced cycle thermal food processing and reduces the cost of the cooler compared to serial finned-tube coolers.

1. Vortex cooler with continuous removal of frost, containing eddy heat exchangers, pipes vortex heat exchanger inside which moves the cooled air swirler, the actuator treatment mechanisms including placed inside the mentioned pipes hollow drive shaft with a longitudinal groove along its length, which is installed inside the fixed screw with nut associated key with a freely mounted on the shaft sleeve, and fixed on the last brush holders with brushes, characterized in that it contains a combining duct and fan, and on the outer surface of the vortex tubes of heat exchangers placed in the gutter, inside of which circulates the refrigerant, while the vortex the heat exchangers are made with a coefficient of fins, which changes in accordance with a ratio ofwhere D is the pipe diameter; n is the number of grooves; l is the width of the gutter, which, in turn, changes within: D=50-800 mm; l=20-150 mm, and the height of the chute l1=3-40 mm; the wall thickness of the pipe δ=1-8 mm and wall thickness gutters δ=1-5 mm

2. Vortex of vzducholod the tel according to claim 1, wherein the swirler contain twisting the blades and the core and is made with a ratio of diameters D/d≤10, the angles of twisting of the blades relative to the generatrix of the change in the inlet air flow in the swirl α=0-70 and outlet air flow from the swirl β=20-70, and the length of the vortex heat exchanger made in accordance with the L/D ratio≤60, where L is the length of the heat exchanger; d is the core diameter of the swirl.

3. Vortex air cooler according to claim 1, characterized in that in order to prevent deflection of the hollow shaft in the middle of the heat exchanger of the intermediate bearing.

4. Vortex air cooler according to claim 1, characterized in that the fixed screw on the ends are made with a square cross section and is mounted on supports with square holes.

5. Vortex air cooler according to claim 1, characterized in that during the gathering of the nuts with screws and reverse the hollow shaft at the ends of the screw set spring, which engages the nut from the screw.

6. Vortex air cooler according to claim 1, characterized in that the brush holders with brushes installed in compressed springs, and springs on the rods which are rigidly attached to the sleeve.



 

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