CN111947489A - Supercooling device with high supercooling efficiency and heat exchanger - Google Patents

Abstract

The invention provides a subcooling device and a heat exchanger with high subcooling efficiency. The subcooling device includes: a casing, which is provided with an orifice and a liquid outlet; a heat exchange tube, which is arranged inside the casing, and both ends of the heat exchange tube pass through the casing The liquid refrigerant is in communication with the liquid refrigerant; the liquid refrigerant flashes from the orifice and enters the casing to exchange heat with the heat exchange tube, and flows out of the casing through the liquid outlet. In the supercooling device and heat exchanger with high supercooling efficiency provided by the present invention, an orifice is arranged to flash liquid refrigerant, and cooling water is used to condense the gaseous refrigerant produced by flashing, so that the flashing process continues, thereby increasing the overheating process. The cooling degree is set, and the air-homogeneous structure is set to increase the contact efficiency between the gaseous refrigerant and the heat exchange tube, thereby effectively improving the utilization rate of the heat exchange area inside the subcooler and improving the condensation efficiency of the gaseous refrigerant.

Description

Subcooling device and heat exchanger with high subcooling efficiency

technical field

The invention relates to the technical field of air treatment equipment, in particular to a subcooling device and a heat exchanger with high subcooling efficiency.

Background technique

Shell-and-tube condensers are commonly used in large-scale chiller air-conditioning systems. The inlet high-temperature superheated gaseous refrigerant exchanges heat with the cooling medium in the heat exchange tube. After cooling and condensation, it becomes a saturated liquid refrigerant, and the saturated liquid refrigerant enters the subcooling device to further reduce the temperature ( That is to increase its subcooling degree), and finally enter the evaporator through throttling to exchange heat with the chilled water, reduce the temperature of the chilled water and supply it to the user. The subcooling device can be divided into external and built-in according to the installation form. Compared with the external independent subcooling device, the subcooling device is built into the condenser, which can reduce the leakage of the system pipeline and reduce the hidden danger, but the conventional built-in subcooling device The device generally adopts the form of baffle for subcooling, the structure is simple, and due to the small reserved internal space of the condenser, the convection heat exchange area is limited, and the subcooling degree improvement is also limited.

SUMMARY OF THE INVENTION

In order to solve the technical problem of poor subcooling effect of the baffle form in the prior art, a subcooling device and a heat exchanger with high subcooling efficiency are provided in which an orifice and a heat exchange tube are arranged on the casing for subcooling.

A supercooling device immersed in a liquid refrigerant, the supercooling device comprising:

a casing, which is provided with an orifice and a liquid outlet;

a heat exchange tube, which is arranged inside the shell, and both ends of the heat exchange tube penetrate through the shell to communicate with cooling water;

The liquid refrigerant is flashed from the orifice and then enters the casing for heat exchange with the heat exchange tube, and flows out of the casing through the liquid outlet.

Along the length direction of the casing, the casing has a first side surface and a second side surface opposite to each other, one end of the heat exchange tube penetrates the first side surface, and the other end of the heat exchange tube penetrates the first side surface. Two sides.

The throttle hole is provided on the first side surface; or the throttle hole is provided on the second side surface; or the throttle hole is provided on both the first side surface and the second side surface hole.

The number of the heat exchange tubes is plural, and the ends of the heat exchange tubes are evenly distributed on the peripheral side of the orifice.

The supercooling device further includes an air equalizing mechanism, the air equalizing mechanism is arranged inside the casing, and the throttle hole communicates with the inside of the casing through the air equalizing mechanism.

The air equalizing mechanism is a tubular structure, the end of the tubular structure abuts on the inner surface of the casing, and the end of the tubular structure communicates with the throttle hole, and the circumference of the tubular structure is in contact with the orifice. There are even air holes on the side.

The cross section of the tubular structure is circular or square.

The tubular structure includes five planes connected in sequence, two adjacent planes each have an included angle, and all five planes are provided with uniform air holes.

The five planes include a first plane, a second plane, a third plane, a fourth plane and a fifth plane that are connected in sequence, the fifth plane is parallel to the bottom surface of the casing, and the first plane, The second plane, the third plane and the fourth plane are all disposed on the side of the fifth plane away from the bottom surface.

The cross section of the orifice is circular or square.

A heat exchanger, comprising the above-mentioned subcooling device.

The subcooling device is below the liquid level inside the heat exchanger; or the orifice is below the liquid level inside the heat exchanger.

A support plate is arranged in the heat exchanger, a heat exchange tube hole is formed on the support plate, and the edge of the support plate is fixedly arranged with the casing.

The heat exchanger is provided with a partition, the partition divides the heat exchanger into a condensation area and a subcooling area, and the subcooling device is arranged in the subcooling area.

In the subcooling device and heat exchanger with high subcooling efficiency provided by the present invention, an orifice is arranged to flash and supercool the liquid refrigerant, and cooling water is used to condense the gaseous refrigerant produced by the flash, so that the flash process continues, thereby Increase the degree of subcooling, and set up a gas-equalizing structure to increase the contact efficiency between the gaseous refrigerant and the heat exchange tube, thereby effectively improving the utilization rate of the heat exchange area inside the subcooler and improving the condensation efficiency of the gaseous refrigerant.

Description of drawings

1 is a schematic structural diagram of a heat exchanger according to an embodiment of a subcooling device with high subcooling efficiency and a heat exchanger provided by the present invention;

2 is a schematic structural diagram of a subcooling device of an embodiment of a subcooling device with high subcooling efficiency and a heat exchanger provided by the present invention;

3 is a side view of the subcooling device of the embodiment of the subcooling device with high subcooling efficiency and the heat exchanger provided by the present invention;

4 is a side cross-sectional view of the subcooling device of the embodiment of the subcooling device with high subcooling efficiency and the heat exchanger provided by the present invention;

5 is a perspective view of a subcooling device of an embodiment of a subcooling device with high subcooling efficiency and a heat exchanger provided by the present invention;

6 is a schematic structural diagram of the liquid homogenization mechanism of the embodiment of the subcooling device with high subcooling efficiency and the heat exchanger provided by the present invention;

In the picture:

1. Shell; 11. Orifice; 12. Liquid outlet; 2. Heat exchange tube; 3. Air equalization mechanism; 31. Air equalization hole.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The subcooling device shown in Figures 1 to 6 is immersed in a liquid refrigerant. The subcooling device includes: a casing 1, which is provided with an orifice 11 and a liquid outlet 12. The casing 1 is provided with a throttle hole 11 and a liquid outlet 12. The inside of the casing 1 is relatively sealed with the outside of the casing 1, so that the refrigerant inside the casing 1 and the refrigerant outside the casing 1 will not flow with each other, and the refrigerant outside the casing 1 can only flow from the throttling. The hole 11 flows into the inside of the casing 1, so it must be supercooled by the throttling flash effect of the throttling hole 11, and the liquid outlet 12 is used for the liquid refrigerant inside the casing 1 (including the subcooled part). and the part directly flowing in from the orifice 11) is discharged from the casing 1; the heat exchange tube 2 is arranged inside the casing 1, and both ends of the heat exchange tube 2 penetrate the casing 1 and the cooling water The heat exchange tube 2 introduces the cooling water into the shell 1, and exchanges heat with the gaseous refrigerant inside the shell 1, so as to condense the flashed gaseous refrigerant to form a liquid subcooled refrigerant to realize secondary subcooling; The refrigerant is flashed from the orifice 11 and divided into gaseous refrigerant and liquid refrigerant. The liquid refrigerant is directly discharged from the casing 1 through the liquid outlet 12, and the gaseous refrigerant enters the casing 1 and exchanges heat with the heat exchange tube 2. , condensed into a subcooled liquid refrigerant, and flows out of the casing 1 through the liquid outlet 12 , so that the entire subcooling device can achieve secondary subcooling of the refrigerant and increase the supercooling efficiency.

Along the length direction of the casing 1, the casing 1 has a first side surface and a second side surface opposite to each other, one end of the heat exchange tube 2 penetrates the first side surface, and the other end of the heat exchange tube 2 passes through the first side surface. Passing through the second side surface, that is, the liquid refrigerant can enter the housing 1 from one side in the longitudinal direction of the housing 1 and flow out from the other side of the housing 1 to complete the flow.

The throttle hole 11 is provided on the first side surface; or the throttle hole 11 is provided on the second side surface; or the throttle hole 11 is provided on both the first side surface and the second side surface. As for the orifice 11 , the position of the orifice 11 is selected according to the installation position of the casing 1 .

The number of the heat exchange tubes 2 is multiple, and the ends of the heat exchange tubes 2 are evenly distributed on the peripheral side of the orifice 11 , so that the gaseous refrigerant flowing out of the orifice 11 can flow in any direction. Both can be in contact with the heat exchange tube 2 for heat exchange to ensure the supercooling effect.

The subcooling device further includes an air equalizing mechanism 3 , the air equalizing mechanism 3 is arranged inside the casing 1 , and the throttle hole 11 communicates with the interior of the casing 1 through the air equalizing mechanism 3 . , the gaseous refrigerant flashed from the orifice 11 is evenly distributed through the gas equalization mechanism 3, so that the heat exchange tube 2 can perform uniform heat exchange and increase the supercooling effect.

The air equalizing mechanism 3 is a tubular structure, the end of the tubular structure abuts on the inner surface of the housing 1, and the end of the tubular structure communicates with the throttle hole 11, the tubular structure There are uniform air holes 31 on the peripheral side of the structure, so that the tubular structure can send the gaseous refrigerant to the heat exchange tube 2 located on the peripheral side of the orifice 11 for heat exchange, thereby increasing the heat exchange efficiency of the gaseous refrigerant and improving the cooling efficiency. cooling efficiency.

The cross section of the tubular structure is circular or square.

The tubular structure includes five planes connected in sequence, two adjacent planes each have an included angle, and each of the five planes is provided with air holes 31 .

The five planes include a first plane, a second plane, a third plane, a fourth plane and a fifth plane connected in sequence, the fifth plane is parallel to the bottom surface of the housing 1, and the first plane , the second plane, the third plane and the fourth plane are all arranged on the side of the fifth plane away from the bottom surface, the first plane is A, the second plane is B, the third plane is C, and the fourth plane is D, the fifth plane is E, in which A, B, C, D are the inclined gas outlet surfaces, and the bottom E surface is the horizontal liquid outlet surface, that is, the gaseous refrigerant flows from A, B, C, and D to the outside after passing through the porous homogenization. ensure full contact with each heat transfer tube at an appropriate flow rate. Surfaces A, B, C, and D are all inclined and arranged with staggered openings. The heat exchange tubes are laid out against the openings of the gas equalization mechanism. The refrigerant gas flows vertically to the heat exchange tubes, and the condensed liquid refrigerant is forced downward by gravity. When dripping, the inclined arrangement of the perforated plates on the A and B faces can make the upper condensate flow down smoothly to the bottom of the casing or enter the inside of the gas equalization mechanism through the small holes, and then flow out to the bottom of the casing through the small holes on the E face. After the gas flowing out from the C and D surfaces is condensed, it drips directly into the bottom of the shell under the action of gravity to avoid the gas rushing to the local area and cannot make full use of the heat exchange area. The size and number of openings are related to the amount of flash and circulation. Ensure that the proper airflow velocity is in contact with the heat exchange tube to improve the heat exchange efficiency. The E surface of the air equalizing mechanism is assembled at the bottom, and holes or slits are also opened on it, so that the liquid entering the air equalizing mechanism can smoothly flow out to the bottom of the casing, and finally out of the casing 1 .

The cross section of the orifice 11 is circular or square.

A heat exchanger, comprising the above-mentioned subcooling device.

The subcooling device is below the liquid level inside the heat exchanger; or the throttle hole 11 is below the liquid level inside the heat exchanger, so that the liquid refrigerant in the heat exchanger can enter the subcooling device The interior is too cold.

The heat exchanger is provided with a support plate, a heat exchange tube hole is formed on the support plate, and the edge of the support plate is fixedly arranged with the shell 1, that is, the support plate in the heat exchanger is connected to the shell. The body 1 is fixed to ensure the reliability of the fixing of the casing 1 .

The heat exchanger is provided with a partition, the partition divides the heat exchanger into a condensation area and a subcooling area, and the subcooling device is arranged in the subcooling area.

The heat exchanger is provided with a liquid outlet pipe, and the liquid outlet port 12 is communicated with the liquid outlet pipe, so that the refrigerant entering the subcooling device flows to the bottom of the shell 1, and then flows from the liquid outlet port. 12 is directly transported into the liquid outlet pipe, so as to ensure that the refrigerant inside the shell 1 can flow out through the liquid outlet 12 smoothly, so as to avoid the liquid refrigerant inside the heat exchanger entering the shell from the liquid outlet 12 and affecting the subcooling. The supercooling effect of the device can also avoid the problem that the liquid refrigerant flowing out of the liquid outlet 12 needs to overcome the pressure inside the heat exchanger and cause the problem of poor liquid discharge.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (14)

1. A supercooling device, characterized in that: immersed in a liquid refrigerant, the supercooling device comprising: a casing (1), the casing (1) is provided with an orifice (11) and a liquid outlet (12); A heat exchange tube (2) is arranged inside the casing (1), and both ends of the heat exchange tube (2) pass through the casing (1) and communicate with cooling water; The liquid refrigerant flashes from the orifice (11) and enters the casing (1) for heat exchange with the heat exchange tube (2), and flows out of the casing through the liquid outlet (12). (1). 2. The supercooling device according to claim 1, characterized in that: along the length direction of the casing (1), the casing (1) has opposite first side surfaces and second side surfaces, and the replacement One end of the heat pipe (2) penetrates the first side surface, and the other end of the heat exchange pipe (2) penetrates the second side surface. 3. The supercooling device according to claim 2, characterized in that: the first side surface is provided with the throttle hole (11); or the second side surface is provided with the throttle hole (11) ); or the throttle holes (11) are provided on both the first side surface and the second side surface. 4 . The subcooling device according to claim 3 , wherein the number of the heat exchange tubes ( 2 ) is multiple, and the ends of the heat exchange tubes ( 2 ) are evenly distributed on the throttle body. 5 . The peripheral side of the hole (11). 5. The subcooling device according to claim 1, characterized in that: the subcooling device further comprises an air equalizing mechanism (3), and the air equalizing mechanism (3) is arranged inside the casing (1), And the throttle hole (11) communicates with the inside of the casing (1) through the air equalizing mechanism (3). 6 . The supercooling device according to claim 5 , wherein the gas equalization mechanism ( 3 ) is a tubular structure, and the end of the tubular structure abuts on the inner surface of the casing ( 1 ). 7 . , and the end of the tubular structure is communicated with the throttle hole (11), and a uniform air hole (31) is provided on the peripheral side of the tubular structure. 7 . The supercooling device according to claim 6 , wherein the cross-section of the tubular structure is circular or square. 8 . 8 . The supercooling device according to claim 6 , wherein the tubular structure comprises five planes connected in sequence, and there is an included angle between two adjacent planes, and the five planes are on the five planes. 9 . Both are provided with uniform air holes (31). 9 . The supercooling device according to claim 8 , wherein the five planes comprise a first plane, a second plane, a third plane, a fourth plane and a fifth plane which are connected in sequence, and the fifth plane The plane is parallel to the bottom surface of the casing (1), and the first plane, the second plane, the third plane and the fourth plane are all arranged on the side of the fifth plane away from the bottom surface. 10. The supercooling device according to claim 1, characterized in that: the cross section of the orifice (11) is circular or square. 11. A heat exchanger, characterized in that it comprises the subcooling device according to any one of claims 1 to 10. 12. The heat exchanger according to claim 11, characterized in that: the subcooling device is located below the liquid level inside the heat exchanger; or the orifice (11) is located inside the heat exchanger below the liquid level. 13 . The heat exchanger according to claim 12 , wherein a support plate is provided in the heat exchanger, a heat exchange tube hole is formed on the support plate, and the edge of the support plate is connected to the edge of the support plate. 14 . The casing (1) is fixedly arranged. 14. The heat exchanger according to claim 11, characterized in that: the heat exchanger is provided with a baffle, the baffle divides the heat exchanger into a condensation area and a subcooling area, and the A cooling device is arranged in the supercooling area.

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