Flash device and heat exchanger with high supercooling efficiency

Abstract

The present invention provides a flash device and heat exchanger with high supercooling efficiency. The flash device is immersed in liquid refrigerant, and the flash device includes: a shell; a supercooling pipe, the supercooling pipe is arranged inside the shell, and low-temperature refrigerant circulates inside the supercooling pipe; a connecting pipe, which is arranged inside the shell, and the end of the connecting pipe passes through the shell and is connected to the liquid refrigerant, and the connecting pipe is provided with a spray hole. The flash device and heat exchanger with high supercooling efficiency provided by the present invention introduces liquid refrigerant into the shell through the connecting pipe and sprays it for flashing, and then uses the supercooling pipe to introduce low-temperature refrigerant for supercooling, effectively increasing the degree of supercooling, and setting a baffle can increase the gas-liquid separation effect in the connecting pipe, while increasing the condensation dripping process of the refrigerant, and setting a corrugated structure to increase the surface area of ​​the gas-liquid mixed refrigerant impacting the baffle, amplifying the filtering effect, and maximizing the degree of supercooling.

Description

Technical Field

[0001] The present invention relates to the technical field of air treatment equipment, in particular to a flash device and a heat exchanger with high supercooling efficiency. Background Art

[0002] At present, in order to improve the energy efficiency of refrigeration equipment units, increasing the subcooling of the condenser is one of the low-cost and effective methods. There are three main methods to increase subcooling: 1. External subcooler, this method is complex and costly; 2. Internal subcooler, this method is simple and cost-effective; 3. Using a system heat recovery cycle, the connecting pipes are complex and have large losses. Therefore, the second structure is cost-effective and widely used, but this structure often increases subcooling by installing more subcooling pipes or baffle structures. This method has the problem of high cost of heat exchange pipes, large system pressure drop caused by the baffle structure, and the liquid refrigerant is easily mixed with the gas and flows out through the liquid outlet, resulting in a small subcooling degree. Summary of the Invention

[0003] In order to solve the technical problem of low supercooling degree of heat exchanger in the prior art, a flash device and a heat exchanger with high supercooling efficiency are provided in which a flash structure is arranged inside the heat exchanger.

[0004] A flash device, immersed in liquid refrigerant, comprising:

[0005] a shell, wherein a liquid outlet is provided at the bottom of the shell;

[0006] a supercooling pipe, the supercooling pipe being arranged inside the shell, and cooling water flowing inside the supercooling pipe;

[0007] a connecting pipe, disposed inside the shell, with an end portion of the connecting pipe penetrating the shell and communicating with the liquid refrigerant, and a spray hole being provided on the connecting pipe;

[0008] The spraying direction of the spray hole is toward the supercooling pipe.

[0009] Both ends of the communicating pipe pass through the shell and communicate with the liquid refrigerant.

[0010] The two ends of the communicating pipe pass through the same side surface of the shell; or the two ends of the communicating pipe pass through different side surfaces of the shell.

[0011] When the flash device is placed horizontally, the shell is a rectangular parallelepiped structure, and both ends of the connecting pipe pass through the bottom surface of the rectangular parallelepiped structure; or when the flash device is placed horizontally, the shell is a rectangular parallelepiped structure, and both ends of the connecting pipe pass through the side surfaces of the rectangular parallelepiped structure.

[0012] The flash device further includes a baffle, the supercooling pipe is arranged above the connecting pipe, the baffle is arranged between the connecting pipe and the supercooling pipe, and the injection direction of the injection hole points to the baffle.

[0013] The baffle is provided with through holes, and the spacing between the through holes is equal along the length direction of the baffle; or the baffle is provided with through holes, and the spacing between the through holes gradually increases along the length direction of the baffle.

[0014] The cross section of the baffle is arc-shaped or inverted V-shaped; or the edge of the baffle is provided with a folded edge.

[0015] Liquid holes are provided on the edge of the baffle, and the spacing between the liquid holes is equal along the length direction of the baffle; or liquid holes are provided on the baffle, and the spacing between the liquid holes gradually increases along the length direction of the baffle.

[0016] A corrugated groove is provided on a surface of the baffle facing the connecting pipe.

[0017] The cross section of the groove is V-shaped or U-shaped.

[0018] When the flash device is arranged horizontally, the baffle forms an angle with the horizontal plane.

[0019] Along the length direction of the baffle, the baffle has a first end and a second end, and a distance from the first end to the bottom surface of the shell is smaller than a distance from the second end to the bottom surface of the shell.

[0020] Along the width direction of the baffle, the baffle has a first edge and a second edge, and a distance from the first edge to the bottom surface of the shell is smaller than a distance from the second edge to the bottom surface of the shell.

[0021] The angle ranges from 0° to 10°.

[0022] The connecting pipe is in a I-shape, an L-shape, a Z-shape or a U-shape.

[0023] The number of the injection holes is proportional to the unit flow rate of the connecting pipe.

[0024] Along the axial direction of the communicating tube, the spacings between adjacent injection holes are equal; or along the axial direction of the communicating tube, the spacings between adjacent injection holes gradually increase.

[0025] A heat exchanger comprises the above-mentioned flash device.

[0026] The flash device is located below the liquid level in the heat exchanger.

[0027] The liquid outlet is communicated with the outside of the heat exchanger.

[0028] The flash device and heat exchanger with high supercooling efficiency provided by the present invention introduce liquid refrigerant into the interior of the shell through a connecting pipe and spray it for flashing, and then use the supercooling pipe to introduce low-temperature refrigerant for supercooling, effectively increasing the supercooling degree. The baffle is set to increase the gas-liquid separation effect in the connecting pipe, while increasing the condensation dripping process of the refrigerant. The corrugated structure is set to increase the surface area of ​​the gas-liquid mixed refrigerant impacting the baffle, amplifying the filtering effect, and maximizing the supercooling degree. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a flash device with high supercooling efficiency and a heat exchanger according to an embodiment of the present invention, wherein the connecting pipe is in a Z-shape;

[0030] Figure 2 A schematic structural diagram of a baffle in an embodiment of a flash device and a heat exchanger with high supercooling efficiency provided by the present invention;

[0031] Figure 3 Another structural schematic diagram of a baffle in an embodiment of a flash device and a heat exchanger with high supercooling efficiency provided by the present invention;

[0032] Figure 4 Another structural schematic diagram of a baffle in an embodiment of a flash device and a heat exchanger with high supercooling efficiency provided by the present invention;

[0033] Figure 5 Another structural schematic diagram of a baffle in an embodiment of a flash device and a heat exchanger with high supercooling efficiency provided by the present invention;

[0034] Figure 6 A schematic structural diagram of a flash device with high supercooling efficiency and a heat exchanger according to an embodiment of the present invention, wherein the baffle is inclined along the length direction;

[0035] Figure 7 A schematic structural diagram of a flash device with high supercooling efficiency and a heat exchanger according to an embodiment of the present invention, wherein the baffle is inclined along the width direction;

[0036] Figure 8 A cross-sectional view of a heat exchanger of an embodiment of a flash device and a heat exchanger with high supercooling efficiency provided by the present invention;

[0037] In the picture:

[0038] 1. Shell; 11. Liquid outlet; 2. Subcooling pipe; 3. Connecting pipe; 31. Injection hole; 4. Baffle; 41. Through hole; 42. Liquid passage hole. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is 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 and are not intended to limit the present invention.

[0040] like Figures 1 to 8 The flash device shown is immersed in liquid refrigerant, and includes:

[0041] A shell 1 is provided with a liquid outlet 11 at the bottom of the shell 1, which forms a relatively closed environment using the shell 1, and the liquid outlet 11 is used to discharge the supercooled liquid refrigerant formed inside the shell 1 out of the shell 1; a supercooling pipe 2 is provided inside the shell 1, and cooling water flows inside the supercooling pipe 2, and the cooling water is used to condense the gaseous refrigerant inside the shell 1, thereby forming a supercooling effect; a connecting pipe 3 is provided inside the shell 1, and the end of the connecting pipe 3 passes through the shell 1 and is connected to the liquid refrigerant, and the connecting pipe 3 is provided with a spray hole 31, and the spray direction of the spray hole 31 is toward the supercooling pipe 2;

[0042] The connecting pipe 3 introduces the liquid refrigerant inside the shell 1, and uses the tiny injection hole 31 to instantly flash the refrigerant into the inside of the shell 1, so that the refrigerant temperature drops instantly, achieving the purpose of flash supercooling. At the same time, the gaseous refrigerant flowing out of the injection hole 31 exchanges heat with the supercooling pipe 2 and condenses into droplets, completing supercooling again, thereby effectively increasing the supercooling effect of the heat exchanger.

[0043] The connecting pipe 3 corresponding to the liquid outlet 11 is not provided with a spray hole 31 to prevent the gaseous refrigerant from directly entering the liquid outlet 11 .

[0044] Both ends of the connecting pipe 3 pass through the shell 1 and are connected to the liquid refrigerant in the heat exchanger. The liquid refrigerant in the heat exchanger can enter the interior of the connecting pipe 3 from both ends of the connecting pipe 3, which ensures that the connecting pipe 3 can only introduce refrigerant but cannot discharge refrigerant, and at the same time increases the amount of liquid refrigerant in the connecting pipe 3, thereby increasing the supercooling effect of the heat exchanger.

[0045] The two ends of the connecting tube 3 pass through the same side of the shell 1; or the two ends of the connecting tube 3 pass through different sides of the shell 1, increasing the liquid inlet direction of the connecting tube 3, avoiding the problem that the liquid level of the liquid refrigerant is uneven and cannot completely cover the end of the connecting tube 3, causing the connecting tube 3 to be unable to smoothly enter the liquid, so that the refrigerant liquid in different positions (such as left and right or front and back of the bottom) or unevenly distributed can be flash-cooled smoothly through the injection hole 31.

[0046] When the flash device is placed horizontally, the shell 1 is a rectangular parallelepiped structure, and the two ends of the connecting pipe 3 pass through the bottom surface of the rectangular parallelepiped structure; or when the flash device is placed horizontally, the shell 1 is a rectangular parallelepiped structure, and the two ends of the connecting pipe 3 pass through the side surfaces of the rectangular parallelepiped structure, that is, except for the top surface of the rectangular parallelepiped structure, other surfaces of the rectangular parallelepiped structure can enter liquid.

[0047] The flash device also includes a baffle 4, the subcooling pipe 2 is arranged above the connecting pipe 3, the baffle 4 is arranged between the connecting pipe 3 and the subcooling pipe 2, and the injection direction of the injection hole 31 points to the baffle 4. The refrigerant injected from the injection hole 31 can collide with the surface of the baffle 4 and condense into liquid refrigerant to complete subcooling. At the same time, the gaseous refrigerant in contact with the subcooling pipe 2 will condense and drip onto the baffle 4, and gather on the baffle 4 and drip to the bottom of the shell 1.

[0048] The baffle 4 is provided with through holes 41, and the spacing of the through holes 41 is equal along the length direction of the baffle 4; or the baffle 4 is provided with through holes 41, and the spacing of the through holes 41 gradually increases along the length direction of the baffle 4, wherein the through holes 41 can be circular or square, and the spacing of the through holes 41 is selected according to actual needs;

[0049] Preferably, the baffle 4 corresponding to the injection hole 31 is not provided with a through hole 41 to avoid the injected refrigerant directly passing through the through hole 41 and contacting the supercooling tube 2, thereby reducing the heat exchange effect of the supercooling tube 2.

[0050] The cross section of the baffle 4 is arc-shaped or inverted V-shaped; or the edge of the baffle 4 is provided with a folded edge, which increases the surface area relative to the flat plate, thereby increasing the gas-liquid separation effect, and is more conducive to the collection and dripping of droplets formed at the supercooling tube 2.

[0051] Liquid holes 42 are provided on the edge of the baffle 4, and the spacing between the liquid holes 42 is equal along the length direction of the baffle 4; or liquid holes 42 are provided on the baffle 4, and the spacing between the liquid holes 42 gradually increases along the length direction of the baffle 4, so that the droplets formed at the supercooling tube 2 can flow back to the bottom of the shell 1 at the liquid holes 42.

[0052] The baffle 4 is provided with corrugated grooves on the surface facing the connecting pipe 3, and a plurality of grooves constitute a corrugated groove structure, thereby increasing the surface area of ​​the gas-liquid mixed refrigerant impacting, so as to separate small droplets from the gaseous refrigerant to the maximum extent and increase the filtering effect. The grooves are opened along the length direction of the baffle 4 or along the width direction of the baffle 4, both of which can play a role in accelerating the diversion of the converged droplets.

[0053] The cross section of the groove is V-shaped or U-shaped.

[0054] When the flash device is arranged horizontally, the baffle 4 has an angle α with the horizontal plane, that is, the baffle 4 is arranged tilted, thereby accelerating the diversion of the droplets and collecting them on the inner wall of the shell 1 to drip.

[0055] Along the length direction of the baffle 4, the baffle 4 has a first end and a second end, and the distance from the first end to the bottom surface of the shell 1 is smaller than the distance from the second end to the bottom surface of the shell 1, that is, the baffle 4 is inclined along its length direction.

[0056] Along the width direction of the baffle 4, the baffle 4 has a first edge and a second edge, and the distance from the first edge to the bottom surface of the shell 1 is smaller than the distance from the second edge to the bottom surface of the shell 1, that is, the baffle 4 is inclined along its width direction.

[0057] The angle α ranges from 0° to 10°.

[0058] The connecting pipe 3 is in a shape of I, L, Z or U, and the specific shape is determined according to the needs such as the liquid level height of the liquid refrigerant.

[0059] The number of the injection holes 31 is proportional to the unit flow rate of the connecting pipe 3 , ensuring that the injection holes 31 can fully perform flash subcooling.

[0060] Along the axial direction of the communicating tube 3 , the intervals between adjacent injection holes 31 are equal; or along the axial direction of the communicating tube 3 , the intervals between adjacent injection holes 31 gradually increase.

[0061] A heat exchanger comprises the above-mentioned flash device.

[0062] The flash device is located below the liquid level in the heat exchanger, that is, the flash device is immersed in the liquid refrigerant in the heat exchanger.

[0063] The liquid outlet 11 is connected to the outside of the heat exchanger, and the supercooled refrigerant inside the shell 1 is directly discharged to the heat exchanger through the liquid outlet 11 without mixing with the liquid refrigerant in the heat exchanger, thereby preventing the liquid refrigerant in the heat exchanger from entering the shell 1 through the liquid outlet 11, and also increasing the supercooling degree of the refrigerant discharged from the heat exchanger.

[0064] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A flash device, characterized in that: Immersed in liquid refrigerant, the flash device comprises: A housing (1), wherein a liquid outlet (11) is provided at the bottom of the housing (1); A supercooling pipe (2), wherein the supercooling pipe (2) is arranged inside the shell (1), and cooling water flows inside the supercooling pipe (2); A connecting pipe (3) is provided inside the shell (1), and an end portion of the connecting pipe (3) passes through the shell (1) and is connected to the liquid refrigerant, and a spray hole (31) is provided on the connecting pipe (3); The flash device further comprises a baffle (4), the supercooling pipe (2) is arranged above the connecting pipe (3), the baffle (4) is arranged between the connecting pipe (3) and the supercooling pipe (2), and the injection direction of the injection hole (31) points to the baffle (4); The baffle (4) is provided with through holes (41), and the spacing between the through holes (41) is equal along the length direction of the baffle (4); or the baffle (4) is provided with through holes (41), and the spacing between the through holes (41) gradually increases along the length direction of the baffle (4); The cross section of the baffle (4) is arc-shaped or inverted V-shaped; or a folded edge is provided at the edge of the baffle (4); Liquid holes (42) are provided on the edge of the baffle (4), and the spacing between the liquid holes (42) is equal along the length direction of the baffle (4); or liquid holes (42) are provided on the baffle (4), and the spacing between the liquid holes (42) gradually increases along the length direction of the baffle (4).

2. The flash device according to claim 1, characterized in that: The spraying direction of the spray hole (31) is toward the supercooling tube (2).

3. The flash device according to claim 1, wherein: Both ends of the connecting pipe (3) pass through the shell (1) and are connected to the liquid refrigerant.

4. The flash device according to claim 3, characterized in that: The two ends of the connecting pipe (3) pass through the same side of the shell (1); or the two ends of the connecting pipe (3) pass through different sides of the shell (1).

5. The flash device according to claim 3, characterized in that: The shell (1) is a rectangular parallelepiped structure, and both ends of the connecting pipe (3) pass through the bottom surface of the rectangular parallelepiped structure; or both ends of the connecting pipe (3) pass through the side surface of the rectangular parallelepiped structure.

6. The flash device according to claim 1, characterized in that: Corrugated grooves are provided on the surface of the baffle (4) facing the connecting pipe (3).

7. The flash device according to claim 1, characterized in that: The baffle (4) has an included angle with the horizontal plane.

8. The flash device according to claim 7, characterized in that: Along the length direction of the baffle (4), the baffle (4) has a first end and a second end, and the distance from the first end to the bottom surface of the shell (1) is smaller than the distance from the second end to the bottom surface of the shell (1).

9. The flash device according to claim 7, characterized in that: Along the width direction of the baffle (4), the baffle (4) has a first edge and a second edge, and the distance from the first edge to the bottom surface of the shell (1) is smaller than the distance from the second edge to the bottom surface of the shell (1).

10. The flash device according to claim 7, characterized in that: The angle ranges from 0° to 10°.

11. The flash device according to claim 1, characterized in that: The connecting pipe (3) is in a I-shape, an L-shape, a Z-shape or a U-shape.

12. The flash device according to claim 1, characterized in that: The number of the injection holes (31) is proportional to the unit flow rate of the connecting pipe (3).

13. The flash device according to claim 1, characterized in that: Along the axial direction of the connecting pipe (3), the spacing between adjacent injection holes (31) is equal; or along the axial direction of the connecting pipe (3), the spacing between adjacent injection holes (31) gradually increases.

14. A heat exchanger, characterized in that: The flashing device comprises the flashing device according to any one of claims 1 to 13.

15. The heat exchanger according to claim 14, characterized in that: The flash device is located below the liquid level in the heat exchanger.

16. The heat exchanger according to claim 14, characterized in that: The liquid outlet (11) is in communication with the outside of the heat exchanger.

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