Heat exchanger

 

(57) Abstract:

Usage: in heat technology, mainly for cooling or heating liquids in the food industry and in the chemical industry or in the courts for cooling of the catch. The inventive heat exchanger comprises a cylindrical housing 1 with a cooled jacket 2 and placed coaxially therein a drum 3 mounted on a rotating hollow shaft 4. The housing 1 is connected manifold chambers 5 and 6 for input and output cooled or heated liquid from the apparatus. Inside the drum 3 coaxially mounted on a rotating hollow shaft 4 sealed cylinder 7, having a flat base 8 and base 9 made in the form of a truncated cone. The base 8 and 9 mounted on a rotating hollow shaft 4, one end of which there are openings 10. Between the holes 10 for rotating the hollow shaft 4 is attached to the radial plate 11 made in the form of trapezoids. The inner surface of the drum 3 provided with protrusions 12. In the collector chamber 5 is equipped with a bladed wheel 13, and the collector chamber 6 - blade wheel 15. 2 C.p. f-crystals, 3 ill.

The invention relates to heat exchange apparatus, primarily for ogladaj equipment, where you want compact high-performance equipment for cooling or heating liquids.

A device for cooling fish in a liquid medium containing a double wall tank for the storage of fish, coupled with capacity cylindrical heat exchanger with a shirt and coaxially located therein a rotor having on the mechanical part of the impeller of the pump and the heat exchanger is placed horizontally, the shirt has a tapered shape, and in the space between the jacket and the tank is located a spiral with the formation of the helical channel with the impeller has a guide ring mounted on the ends of the blades of the pump, and the rotor is made smooth, in addition, the storage capacity of the fish is connected with the heat exchanger flexible pipelines (ed. St. USSR N 1653694, CL 4/0,6, 21.12.88).

Following the essential features of this technical solution coincide with the essential features of the invention, namely a device for cooling fish in liquid medium comprises a heat exchanger with a shirt and coaxially located therein, the rotor having on the mechanical part of the impeller of the pump, and in the space between the jacket and the tank are spiral with the formation of Teploobmennik, and the cooling water is carried out only on the side of the case. The wall of the rotor can be used to increase the heat transfer rate.

The closest technical solution, selected as a prototype is a heat exchanger, mainly for cooling viscous liquids containing a cooled enclosure with coaxially placed in it a drum mounted on a rotating hollow shaft for the circulation of refrigerant, and a manifold chamber connected to the housing cavity, while the inside of the drum has a perforated glass with a false bottom and mesh on the side for the distribution of the refrigerant on the inner surface of the drum, and in the collector cameras installed blade wheel for pumping fluid through the body cavity, and the inner surface of the casing reinforced perforated radial ribs, a drum is made in the form of a truncated cone with a cone angle of about 1 5oC, (ed. St. USSR N 455235, 30.12.74, BI N 48).

Following the essential features of this technical solution coincide with the essential features of the invention, namely: heat exchanger for cooling liquids contains a cooled curposy on a rotating hollow shaft for the circulation of refrigerant, and collector of cameras connected to the cavity of the housing and provided with a blade wheel for pumping the cooled liquid.

The disadvantage of this device is the presence of the smooth inner surface of the drum and a perforated Cup, which do not provide the necessary turbulence in the refrigerant heat exchange surface of the drum, which prevents the increase of heat transfer rate.

The task of the invention to increase the heat transfer rate.

The technical result of the invention increase the heat transfer rate.

In the proposed device the technical result is achieved in that in a heat exchange apparatus for cooling or heating liquids, comprising a housing with a jacket and formed between them an annular cavity coaxially located within the housing of the drum, mounted on a rotating hollow shaft for the circulation of refrigerant, and a manifold chamber connected to the casing and a vane wheels for pumping the cooled or heated liquid, and inside the drum coaxially mounted sealed cylinder, with one of the end parts of the rotating hollow shaft provided with holes destiny to circulate coolant (refrigerant) through the annular cavity, formed by the drum and sealed cylinder, the base of which is attached to a rotating hollow shaft, and one of the grounds is made in the form of a truncated cone and the inner surface of the drum is provided with lugs, in addition, the radial plates are made in the form of trapezoids.

Comparative analysis of the prototype allows us to conclude that the proposed heat exchanger differs in that the inside of the drum coaxially mounted sealed cylinder, with one of the end parts of the rotating hollow shaft with openings on a rotating hollow shaft fixed radial plate for pumping coolant through the annular cavity formed by the drum and sealed cylinder, the base of which is attached to a rotating hollow shaft, and one of the grounds is made in the form of a truncated cone and the inner surface of the drum is provided with lugs, in addition, the radial plates are made in the form of trapezoids.

A housing with a jacket to form an annular cavity for the circulation of the coolant. The building drum to form an annular cavity for the circulation of a cooled or heated liquid. The drum serves to turbulence in the boundary layer of the cooling gap the holes, located on one of the end parts of the shaft, provides a supply of fluid in the cavity of the drum.

Rotating the hollow shaft serves for fastening on it drum tight cylinder and radial plates. Collector cameras are designed for input and output of the cooled or heated fluid from the cavity formed by the housing and drum. Blade wheel, installed in the manifold chambers are used for pumping the cooled and heated liquid between the body and face.

A sealed cylinder, is placed coaxially inside the drum, forming a narrow annular cavity in the form of a slit, thereby increasing the speed of the fluid on the inner wall of the drum, ribbed protrusions. Holes in one of the end parts of the rotating hollow shaft serving for the passage of fluid from the cavity of the shaft in the cavity of the drum. Radial plate mounted on a rotating hollow shaft, provide the pumping of coolant through the annular cavity formed by the drum and sealed cylinder.

The base of the cylinder is attached to a rotating hollow shaft to ensure its integrity. One of the grounds of the pressurized cylinder is performance communications plate made in the form of trapezes to capture them during the rotation of the large volume of fluid.

The inner surface of the drum is provided with protrusions to enhance turbulence in the coolant and giving them arabinose heat transfer surfaces to enhance heat transfer.

In Fig.1 there is shown a heat exchanger, (longitudinal section); Fig.2 is a section along a-a in Fig.1; Fig.3 node I in Fig.1.

Heat exchanger comprises a cylindrical housing 1 with a cooled jacket 2 and placed coaxially therein a drum 3 mounted on a rotating hollow shaft 4 to the brine.

The path of movement of the cooled or heated fluid in the heat exchange apparatus shown in solid line arrows and the path of flow - dotted line arrows.

To the cavity of the stationary housing 1 is connected manifold chambers 5 and 6 respectively for input and output of the apparatus to be cooled or heated liquid.

Inside the drum 3 coaxially mounted on a rotating hollow shaft 4 sealed cylinder 7, having a flat base 8 and base 9 made in the form of a truncated cone. The base 8 and 9 mounted on a rotating hollow shaft 4, one end of which there are openings 10. Between the holes 10 to the torque ICS sealed cylinder 7. The inner surface of the drum 3 provided with protrusions 12.

In the collector chamber 5 is equipped with a bladed wheel 13, mounted on the end surface of the drum 3, for pumping the cooled or heated fluid through the annular cavity 14 between the housing 1 and the drum 3. In the collector chamber 6 is set blade wheel 15, mounted on the cylindrical wall of the drum 3.

In the annular cavity 16 formed by the housing 1 and the jacket 2, installed in the form of a spiral septum 17, forming a helical channel for the circulation of the coolant.

Radial plate 11 provide the pumping of coolant through the annular cavity 18 formed by the drum 3 and sealed by the cylinder 7.

The execution of the base 9 of the pressurized cylinder 7 in the form of a truncated cone and radial plates 11 in the form of trapezoids, provides connectivity greatest pumping effect required for pumping the coolant through the annular cavity 18, since it is known that the pumping effect during the rotation of the liquid creates a centrifugal force of its rotation. The magnitude of the centrifugal force is equal to:

F = mr2< / BR>
where: F is the centrifugal force;

m the mass of the rotating fluid;

r2osnovaniya 9 sealed cylinder 7 in the form of a truncated cone provides increased volume in which are radial plate 11, and, consequently, the increase of mass m rotating fluid. This results in the increase of the centrifugal force F, i.e., a pumping effect, which increases the velocity of the fluid in the annular cavity 18. And, as a consequence, there is an increase in the intensity of heat transfer through the side surface of the drum 3 between a cooled or heated liquid coolant moving in the annular cavity 18.

When coolant flow projections 12, it turbulization in the annular cavity 18, which also increases the heat exchange rate.

The proposed heat exchanger operates as follows. For example, cooling fluid.

The liquid to be cooled is supplied from a tank (not shown) through the suction pipe 19 to the collector cell 5 and fill the cavity vane wheel 13 and the annular cavity 14. After that, the hollow shaft with radial plates 11, the drum 3 with blade wheel 13, pressurized cylinder 7 is put into rotation, the capacity of the cooled fluid.

The drum 3 rotates, turbulizer cooled fluid in the annular cavity 14.

the flow of the cooled fluid, formed in the annular cavity 14, increase the intensity of heat transfer to the cooled walls of the housing 1 and the drum 3 due to the intensive rotation of the drum 3.

After the establishment of the permanent flow regime of the cooled fluid in the annular cavity 14, through the suction pipe 21 into the annular cavity 16 serves the refrigerant. Due to the fact that the annular cavity 16 provided with a partition wall 17 made in the form of a spiral, forming a spiral channel, the refrigerant moves with greater velocity through the channel 16, where the curvature of the channel occur secondary flow of the refrigerant, which increases the coefficient of heat transfer from the refrigerant to heat the outer surface of the housing 1.

On the inner surface of the housing 1, the increase in heat transfer rate, as noted, is due to the turbulence of the cooled liquid drum 3 as it rotates. The refrigerant passes the annular cavity 16, taleesa and exits through the outlet 22.

However, after that, the refrigerant has a low enough temperature that allows its further use for cooling fluid. Therefore, the refrigerant through pipe 22 and channel 23 is directed into the input chamber 2 the end portion of the rotating hollow shaft 4. Through holes 10, the refrigerant enters the space between the radial plates 11, which during the rotation of the drum, untwist the refrigerant. In this case the centrifugal forces increase the speed of the refrigerant in a narrow, slotted, annular cavity 18, which leads to greater turbulence in the refrigerant around the protrusions 12, thereby increasing the heat transfer coefficient on the inner surface of the drum 3.

Further, the refrigerant, the cooling fluid passes into the annular cavity 18 and flows through the gaps 26 and 27 in the discharge chamber 28 of the box-shaped clutch 25 and the pressure tube 29 is supplied to a refrigeration unit for re-cooling. After reaching the desired temperature of the liquid in the tank, the cooling stop.

Rotating the hollow shaft 4 is stopped after stopping the supply of the refrigerant.

1. Heat exchanger, comprising a housing covered by the shirt to form between them a cavity in which is placed a spiral wall, coaxially located in the rotating drum, mounted on the hollow shaft for the circulation of the coolant, and the collector of the camera connected to the housing and having a blade wheel for pumping cooled or agreeable annular gap to its inner surface and fixed bases on the hollow shaft, and one of the bases of the hollow cylinder has a cone shape, with one of the end sections of the hollow shaft with holes for the passage of fluid between the holes on the hollow shaft mounted radial plate for pumping coolant through the aforementioned annular gap, and on the inner surface of the rotating drum is made ribbing.

2. The apparatus according to p. 1, characterized in that the radial plates are made in the form of trapezoids.

3. The apparatus according to PP.1 and 2, characterized in that it is provided with a coupling mounted inside the drum at the other end section of the hollow shaft.

 

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