Flash evaporator and heat pump system

Abstract

The utility model relates to a flash evaporator and a heat pump system comprising the same. The flash evaporator provided by the utility model comprises a barrel body, the separation net is arranged in the cylinder body; the liquid inlet pipe and the liquid outlet pipe are arranged on the two sides of the separation net respectively. A bent part is arranged at one end, close to the bottom of the barrel, of the liquid inlet pipe and / or the liquid outlet pipe; the bent part is provided with a liquid taking opening, and the liquid taking opening is formed in the end, away from the partition net, of the bent part. And the air outlet pipe is arranged at the upper end part of the cylinder body and is communicated with the interior of the cylinder body. According to the flash evaporator disclosed by the utility model, the end part of the liquid inlet pipe is bent, so that a refrigerant entering the liquid inlet space has a certain initial velocity direction, and a gas-phase refrigerant is prevented from entering the liquid outlet space; and the gaseous refrigerant is blocked by arranging the separation net, so that the gaseous refrigerant is further prevented from entering the liquid outlet space, and the gas-liquid separation effect of the flash evaporator is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a flash evaporator and a heat pump system. Background Art

[0002] Generally, a heat pump water heater is composed of a compressor, a finned evaporator, a shell and tube heat exchanger, a fan motor, a frame, a pipeline, a flash evaporator and a throttling component. The use of a flash evaporator can improve the performance of the compressor and the evaporator to a certain extent, especially in a low temperature environment, it can improve the heating performance of the heat pump system. The main working principle of the flash evaporator is that the refrigerant at the outlet of the condenser enters the flash evaporator for gas-liquid separation after the first-stage throttling, and the separated liquid refrigerant enters the evaporator for evaporation after the second-stage throttling, while the separated gas refrigerant enters the compressor through the air replenishment circuit to act as compressor air replenishment. Therefore, the structural design of the flash evaporator is crucial to the operation of the system. If the gas-liquid separation effect is poor, the compressor air replenishment may be gas-liquid two-phase, which will affect the reliability of the compressor and the system performance.

[0003] The existing flash evaporator is divided into two chambers, the liquid inlet and the liquid outlet, by setting a partition. After the refrigerant in the gas-liquid mixed state after a throttling enters the chamber on the liquid inlet side of the flash evaporator, the gaseous refrigerant moves upward due to buoyancy, and then enters the compressor through the air outlet for gas replenishment, and the remaining liquid refrigerant enters the next throttling through the chamber on the liquid outlet side, thereby achieving gas-liquid separation. However, in the prior art, in order to avoid insufficient refrigerant, a certain distance is left between the bottom of the partition and the bottom of the flash evaporator so that the bottom of the chamber can flow. In this case, part of the gas will still enter the liquid outlet chamber synchronously with the bottom of the partition. The liquid refrigerant flowing out of the flash evaporator mixed with the gaseous refrigerant will directly affect the evaporation efficiency of the subsequent evaporator. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a flash evaporator, which separates the liquid inlet space and the liquid outlet space by setting a partition net, so that the liquid refrigerant can enter the liquid outlet space from the liquid inlet space through the partition net, and the gaseous refrigerant is blocked in the liquid inlet space and floats up and then discharged to the compressor through the outlet pipe; at the same time, by setting a bending portion in the liquid inlet pipe, the gas-liquid mixed refrigerant after one throttling is sprayed in the direction away from the partition net, which can reduce the gaseous refrigerant from escaping toward the liquid outlet space along with the liquid refrigerant during the rising process.

[0005] Another object of the present invention is to provide a heat pump including the flash evaporator of the present invention.

[0006] A flash evaporator, comprising:

[0007] Cylinder;

[0008] A partition net is arranged inside the cylinder; one end of the partition net is fixedly connected to the bottom of the cylinder, and the other end of the partition net is extended upward;

[0009] A liquid inlet pipe, one end of which passes through the cylinder and extends into the interior of the cylinder, and the other end of which is connected to an external refrigerant pipeline;

[0010] A liquid outlet pipe, one end of which passes through the cylinder and extends into the interior of the cylinder, and the other end of which is connected to an external refrigerant pipeline;

[0011] The liquid inlet pipe and the liquid outlet pipe are respectively arranged on both sides of the partition net; and the liquid inlet pipe and / or the liquid outlet pipe are provided with a bending portion at one end close to the bottom of the cylinder; the bending portion is provided with a liquid taking port, and the liquid taking port is arranged at one end of the bending portion away from the partition net;

[0012] An air outlet pipe is arranged at the upper end of the cylinder and communicated with the interior of the cylinder.

[0013] Furthermore, the liquid inlet pipe and the liquid outlet pipe are both fixedly connected to the top of the cylinder.

[0014] Furthermore, the liquid inlet pipe is provided with a first main body and a first bending portion, one end of the first main body is fixedly connected to the top of the cylinder, and the other end is connected to the first bending portion; the first bending portion is provided with a first liquid intake port at one end away from the first main body; the first liquid intake port is provided relative to the first main body away from the partition net;

[0015] The liquid outlet pipe is provided with a second main body and a second bending portion, one end of the second main body is fixedly connected to the top of the cylinder, and the other end is connected to the second bending portion; a second liquid intake port is provided at one end of the second bending portion away from the second main body; the second liquid intake port is arranged away from the partition relative to the second main body.

[0016] Furthermore, a horizontal distance between the first liquid intake port and the second liquid intake port is 0.5-0.9 times the diameter of the cylinder.

[0017] Furthermore, the included angle between the first main tube and the first bending portion is 90 to 180°; the included angle between the second main tube and the second bending portion is 90 to 180°.

[0018] Furthermore, the liquid inlet pipe and the liquid outlet pipe are symmetrically arranged relative to the partition net.

[0019] Furthermore, the first main pipe body is provided with a first positioning portion, and the second main pipe body is provided with a second positioning portion, for preventing the first main pipe body and the second main pipe body from rotating in the cylinder.

[0020] Furthermore, the height of the partition is greater than the distance from the first liquid intake port to the bottom of the cylinder, and the height of the partition is greater than the distance from the second liquid intake port to the bottom of the cylinder; the partition is spaced apart from the air outlet pipe.

[0021] Furthermore, the mesh number of the silk screen is greater than 80 meshes.

[0022] Furthermore, the utility model further provides a heat pump system, comprising the flash evaporator described in the utility model.

[0023] The utility model has the following beneficial effects:

[0024] (1) By providing a bent portion in the liquid inlet pipe, the gas-liquid mixed refrigerant after the primary throttling is sprayed toward the side wall of the cylinder away from the partition, and the gaseous refrigerant is guided by the side wall of the cylinder to rise vertically and escape, thereby reducing the gaseous refrigerant from escaping toward the liquid outlet space along with the liquid refrigerant during the rising process;

[0025] (2) By increasing the horizontal distance between the two liquid extraction ports, the gaseous refrigerant moving with the liquid refrigerant has more space to escape;

[0026] (3) The liquid inlet space and the liquid outlet space are separated by a partition. The liquid refrigerant can enter the liquid outlet space from the liquid inlet space through the partition. The gaseous refrigerant is blocked in the liquid inlet space and floats up and is then discharged to the compressor through the outlet pipe, thereby improving the gas-liquid separation efficiency of the flash evaporator.

[0027] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 An overall schematic diagram of a flash evaporator provided in an embodiment of the present application;

[0029] Figure 2 Embodiment 1 of the flash evaporator provided in the embodiment of the present application;

[0030] Figure 3 Embodiment 2 of the flash evaporator provided in the embodiment of the present application;

[0031] Figure 4 It is a structural schematic diagram of the partition net;

[0032] Figure 5 A schematic diagram of a heat pump system provided in an embodiment of the present application.

[0033] In the figure, 10-cylinder, 11-first liquid storage space; 12-second liquid storage space; 13-base; 20-partition net; 21-wire mesh; 22-support frame; 30-air outlet pipe; 40-liquid inlet pipe; 41-first main pipe body; 42-first bending part; 43-first liquid intake port; 50-liquid outlet pipe; 51-second main pipe body; 52-second bending part; 53-second liquid intake port; 100-flash evaporator; 200-compressor; 300-first heat exchanger; 400-first throttling device; 500-second throttling device; 600-second heat exchanger. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In the description of the present invention, it should be noted that the terms "vertical direction", "upper", "lower", "horizontal" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or a connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The existing flash evaporator is divided into two chambers, the liquid inlet and the liquid outlet, by setting a partition. After the refrigerant in the gas-liquid mixed state after a throttling enters the chamber on the liquid inlet side of the flash evaporator, the gaseous refrigerant moves upward due to buoyancy, and then enters the compressor through the air outlet for gas replenishment. The remaining liquid refrigerant enters the next throttling through the chamber on the liquid outlet side, thereby achieving gas-liquid separation. However, in the prior art, in order to avoid insufficient refrigerant, a certain distance is left between the bottom of the partition and the bottom of the flash evaporator so that the bottom of the chamber can flow. In this case, part of the gas will still enter the liquid outlet chamber synchronously with the bottom of the partition. The liquid refrigerant mixed with the gaseous refrigerant will directly affect the evaporation efficiency of the subsequent evaporator.

[0038] Based on this, the inventor studied the structure of the flash evaporator and found that the movement of the gaseous refrigerant in the liquid phase refrigerant is approximately a straight upward movement. Therefore, if the gas-liquid two-phase refrigerant entering the flash evaporator can be kept away from the liquid inlet pipe of the liquid outlet space, bubbles can be avoided to a large extent from entering the liquid outlet space. Therefore, the inventor proposed the technical solution of the utility model, which separates the liquid inlet space and the liquid outlet space by setting a partition net, and the liquid refrigerant can enter the liquid outlet space from the liquid inlet space through the partition net, and the gaseous refrigerant is blocked in the liquid inlet space and floats up and then discharged to the compressor through the air outlet pipe; at the same time, by setting a bending part in the liquid inlet pipe, the gas-liquid mixed refrigerant after a throttling is sprayed in the direction away from the partition net, which can reduce the gaseous refrigerant from escaping toward the liquid outlet space during the rising process, and improve the gas-liquid separation effect.

[0039] See also Figure 1 and Figure 2 The embodiment of the present application provides a flash evaporator, comprising: a cylinder 10, a partition net 20, a liquid inlet pipe 40, a liquid outlet pipe 50, and an air outlet pipe 30; the partition net 20 is arranged inside the cylinder 10, one end of the partition net 20 is fixed to the bottom of the cylinder 10, and the other end extends upward to a certain height, dividing the cylinder 10 into two liquid storage spaces, which are respectively defined as a first liquid storage space 11 and a second liquid storage space 12. The liquid inlet pipe 40 and the liquid outlet pipe 50 are respectively arranged on both sides of the partition net 20, one end of the liquid inlet pipe 40 passes through the cylinder 10 and extends into the interior of the cylinder 10, and is located in the first liquid storage space 11; one end of the liquid outlet pipe 50 passes through the cylinder 10 and extends into the interior of the cylinder 10, and is located in the second liquid storage space 12. The air outlet pipe 30 is arranged at the upper end of the cylinder 10 and is connected to the interior of the cylinder 10, and the gaseous refrigerant flows out through the air outlet pipe 30.

[0040] It is understandable that when the heat pump system operates in different modes, the refrigerant flows in different directions. When the gas-liquid mixed refrigerant that has undergone a throttling enters the cylinder 10 via the liquid inlet pipe 40, the first liquid storage space 11 is the liquid inlet space, and the second liquid storage space 12 is the liquid outlet space; when the gas-liquid mixed refrigerant that has undergone a throttling enters the cylinder 10 via the liquid outlet pipe 50, the second liquid storage space 12 is the liquid inlet space, and the first liquid storage space 11 is the liquid outlet space.

[0041] Taking the first liquid storage space 11 as the liquid inlet space as an example, the gas-liquid mixed refrigerant that has been throttled once enters the first liquid storage space 11 through the liquid inlet pipe 40. At this time, the gaseous refrigerant moves upward and escapes from the liquid refrigerant, and then is discharged from the outside of the cylinder 10 through the air outlet pipe 30; at the same time, the liquid refrigerant in the first liquid storage space 11 enters the second liquid storage space 12 through the partition net 20. At this time, there will still be a small amount of gaseous refrigerant mixed in the liquid refrigerant and flowing to the partition net 20. After being blocked by the partition net 20, the gaseous refrigerant stays in the first liquid storage space 11.

[0042] Furthermore, a bending portion is provided at one end of the liquid inlet pipe 40 and / or the liquid outlet pipe 50 near the bottom of the cylinder 10; the bending portion is provided with a liquid taking port, and the liquid taking port is provided at one end of the bending portion away from the partition 20, so that the distance between the liquid inlet pipe 40 and the liquid outlet pipe 50 can be effectively increased, and in the process of the mixed refrigerant moving from the liquid taking port of the liquid inlet pipe 40 to the liquid taking port of the liquid outlet pipe 50, more gaseous refrigerant escapes upward. In addition, the liquid taking port is arranged in a direction away from the partition 20, and the gaseous refrigerant is mixed in the refrigerant fluid and sprayed in a direction away from the partition 20 at a certain flow rate, which can further prevent the gaseous refrigerant from diffusing in the direction of the partition 20.

[0043] See also Figure 2 and Figure 3 It can be understood that, in some embodiments, the liquid inlet pipe 40 and the liquid outlet pipe 50 are inserted into the cylinder 10 from the top of the cylinder 10 toward the top of the cylinder 10. In other embodiments, the liquid inlet pipe 40 and the liquid outlet pipe 50 can also be inserted into the cylinder 10 from the bottom of the cylinder 10 upwards, and even in other embodiments, the liquid inlet pipe 40 and the liquid outlet pipe 50 can be inserted into the cylinder 10 from the side wall of the cylinder 10 at a certain angle, but it is not limited thereto.

[0044] Preferably, in the present embodiment, the liquid inlet pipe 40 and the liquid outlet pipe 50 are vertically inserted into the cylinder body 10 from the top of the cylinder body 10 toward the bottom of the cylinder body 10, so as to more stably fix the liquid inlet pipe 40 and the liquid outlet pipe 50 to the cylinder body 10.

[0045] See also Figure 1 and Figure 2Further, the liquid inlet pipe 40 is provided with a first main body 41 and a first bending portion 42, one end of the first main body 41 is inserted into the top of the cylinder 10, and the other end is connected to the first bending portion 42. The first bending portion 42 is provided with a first liquid intake port 43 at one end away from the first main body 41, and the first liquid intake port 43 is arranged away from the partition net 20 relative to the first main body 41. Similarly, the liquid outlet pipe 50 is provided with a second main body 51 and a second bending portion 52, one end of the second main body 51 is inserted into the top of the cylinder 10, and the other end is connected to the second bending portion 52. The second bending portion 52 is provided with a second liquid intake port 53 at one end away from the second main body 51, and the second liquid intake port 53 is arranged away from the partition net 20 relative to the second main body 51. Preferably, the horizontal spacing L between the first liquid intake port 43 and the second liquid intake port 53 is 0.5-0.9 times the diameter of the cylinder 10. This ensures that in the process of the refrigerant flowing from the liquid inlet space to the liquid outlet space, the gaseous refrigerant has enough space to escape upward, so that the first liquid intake port 43 or the second liquid intake port 53 can completely take in the liquid refrigerant. The liquid refrigerant flows through the subsequent evaporator to achieve uniform liquid separation, and the evaporator capacity is improved by about 2%.

[0046] Furthermore, the angle α between the first main pipe body 41 and the first bending portion 42 is 90-180°; the angle β between the second main pipe body 51 and the second bending portion 52 is 90-180°, so that no matter the liquid inlet pipe 40 is used as the liquid inlet end or the liquid outlet pipe 50 is used as the liquid inlet end, an initial flow rate of the gas-liquid mixed refrigerant can be provided, and the direction of the initial flow rate is consistent with the bending direction of the first bending portion 42 or the second bending portion 52, so that the gaseous refrigerant is blown to the side wall of the cylinder 10 and escapes vertically upward along the side wall. Preferably, the liquid inlet pipe 40 and the liquid outlet pipe 50 are symmetrically arranged relative to the partition net 20.

[0047] Further, the first main body 41 is provided with a first positioning portion, and the second main body 51 is provided with a second positioning portion, which is used to prevent the liquid inlet pipe 40 and the liquid outlet pipe 50 from rotating inside the cylinder 10. It can be understood that in some embodiments, the first positioning portion and the second positioning portion can be a boss, and as a matching, the top of the cylinder 10 is provided with a groove corresponding to the position of the first positioning portion and the second positioning portion, and the first positioning portion and the second positioning portion are respectively clamped in the corresponding groove to prevent the liquid inlet pipe 40 and the liquid outlet pipe 50 from rotating. In some other embodiments, the first positioning portion can be a first positioning groove opened on the outer wall of the first main body 41, and the second positioning portion is a second positioning groove opened on the outer wall of the second main body 51. The first positioning groove and the second positioning groove are horizontally arranged and are clamped on the outside of the first positioning groove and the second positioning groove by a clamping member at the same time, so that the liquid inlet pipe 40 and the liquid outlet pipe 50 can be fixed at the same time. In some other embodiments, the first positioning portion and the second positioning portion can also be other forms of achieving relative fixation with the cylinder 10, which will not be described in detail here.

[0048] Furthermore, in some embodiments, the extension height of the partition net 20 is greater than the distance from the first liquid inlet 43 to the bottom of the cylinder 10; at the same time, the extension height of the partition net 20 is greater than the distance from the second liquid inlet 53 to the bottom of the cylinder 10; and the partition net 20 is arranged at a certain distance from the air outlet pipe 30, so that the upper ends of the liquid inlet space and the liquid outlet space can be connected, and the air pressure above the liquid inlet space and the liquid outlet space can be equal. Preferably, the height of the partition net 20 is 0.6-0.9 times the height of the cylinder 10, so as to ensure that the liquid inlet space has sufficient liquid storage capacity.

[0049] See also Figure 4 Further, in some embodiments, the screen 20 includes a layer of wire mesh 21, which is directly welded to the bottom and side wall of the cylinder 10; the mesh number of the wire mesh 21 is preferably above 80 meshes, which can effectively prevent small bubbles from passing through. In other embodiments, the screen 20 includes multiple layers of wire mesh 21, and a support frame 22 is provided between two adjacent layers of wire mesh 21. The support frame 22 is formed by cross-welding of a plurality of transverse and longitudinal metal strips, and is used to support the wire mesh 21 to ensure the stability of the screen 20. The wire mesh 21 can be made of SUS302, 304, 304L, 316, 316L, pure nickel wire, low-carbon steel wire, etc.

[0050] Furthermore, a plurality of bases 13 are provided at the bottom of the cylinder 10 for supporting the flash evaporator 100 and maintaining the stability of the flash evaporator 100 to avoid mixing of the refrigerants in the two liquid storage spaces inside the cylinder 10 due to shaking of the cylinder 10, thereby affecting the gas-liquid separation effect.

[0051] See also Figure 1-5 The embodiment of the present application further provides a heat pump system, including a compressor 200 , a first heat exchanger 300 , a second heat exchanger 600 , a first throttling device 400 , a second throttling device 500 , and a flash evaporator 100 .

[0052] In the heating mode, the first heat exchanger 300 serves as a condenser, and the second heat exchanger 600 serves as an evaporator. At this time, the first liquid storage space 11 serves as a liquid inlet space, and the second liquid storage space 12 serves as a liquid outlet space. The high-pressure gaseous refrigerant discharged from the compressor 200 is condensed into liquid refrigerant through the condenser, and then throttled through the first throttling member 400 to form a gas-liquid mixed refrigerant. The gas-liquid mixed refrigerant enters the first liquid storage space 11 through the liquid inlet pipe 40, and is ejected toward the side wall of the cylinder 10 away from the partition net 20 through the first bending portion 42, and then is guided through the side wall. Most of the gaseous refrigerant escapes directly upward along the side wall; the remaining part of the gaseous refrigerant is mixed in the liquid refrigerant, and as the liquid refrigerant flows toward the partition net 20, during this flow process, the gaseous refrigerant continues to rise and escape, and the remaining part of the gaseous refrigerant is blocked by the partition net 20 and stays in the first liquid storage space 11, thereby ensuring that the refrigerant entering the second liquid storage space 12 through the partition net 20 is pure liquid, thereby ensuring that the liquid refrigerant taken out through the liquid outlet pipe 50 can be evenly diverted when entering the evaporator, thereby improving the efficiency of the evaporator. The gaseous refrigerant escaping from the first liquid storage space 11 is discharged to the air supply port of the compressor 200 through the air outlet pipe 30 to supply air to the compressor 200, thereby improving the unit performance of the heat pump system at low ambient temperature.

[0053] In the cooling mode, the first heat exchanger 300 acts as an evaporator, and the second heat exchanger 600 acts as a condenser. At this time, the second liquid storage space 12 is the liquid inlet space, and the first liquid storage space 11 is the liquid outlet space. The high-pressure gaseous refrigerant discharged from the compressor 200 is condensed into liquid refrigerant through the condenser, and then throttled by the second throttling member 500 to form a gas-liquid mixed refrigerant. The gas-liquid mixed refrigerant enters the second liquid storage space 12 through the liquid outlet pipe 50, and sprays toward the side wall of the cylinder 10 away from the partition 20 through the second bending portion 52, and then is guided through the side wall. Most of the gaseous refrigerant escapes directly upward along the side wall; the remaining part of the gaseous refrigerant is mixed in the liquid refrigerant, and as the liquid refrigerant flows toward the partition 20, during this flow process, the gaseous refrigerant continues to rise and escape, and the remaining part of the gaseous refrigerant is blocked by the partition 20 and stays in the second liquid storage space 12.

[0054] It is understandable that the flash evaporator 100 can also be arranged at the return air end of the compressor in the heat pump system as a gas-liquid separator, and the air outlet pipe 30 is connected to the return air port of the compressor 200, which will not be described in detail here.

[0055] Compared with the prior art, the beneficial effects of the embodiments of the present application are as follows:

[0056] (1) By providing a bent portion in the liquid inlet pipe, the gas-liquid mixed refrigerant after the primary throttling is sprayed toward the side wall of the cylinder away from the partition, and the gaseous refrigerant is guided by the side wall of the cylinder to rise vertically and escape, thereby reducing the gaseous refrigerant from escaping toward the liquid outlet space along with the liquid refrigerant during the rising process;

[0057] (2) By increasing the horizontal distance between the two liquid extraction ports, the gaseous refrigerant moving with the liquid refrigerant has more space to escape;

[0058] (3) The liquid inlet space and the liquid outlet space are separated by a partition. The liquid refrigerant can enter the liquid outlet space from the liquid inlet space through the partition. The gaseous refrigerant is blocked in the liquid inlet space and floats up and is then discharged to the compressor through the outlet pipe, thereby improving the gas-liquid separation efficiency of the flash evaporator.

[0059] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.

Claims

1. A flash evaporator, characterized in that: include Cylinder; A partition net is arranged inside the cylinder; one end of the partition net is fixedly connected to the bottom of the cylinder, and the other end of the partition net is extended upward; A liquid inlet pipe, one end of which passes through the cylinder and extends into the interior of the cylinder, and the other end of which is connected to an external refrigerant pipeline; A liquid outlet pipe, one end of which passes through the cylinder and extends into the interior of the cylinder, and the other end of which is connected to an external refrigerant pipeline; The liquid inlet pipe and the liquid outlet pipe are respectively arranged on both sides of the partition net; and the liquid inlet pipe and / or the liquid outlet pipe are provided with a bending portion at one end close to the bottom of the cylinder; the bending portion is provided with a liquid taking port, and the liquid taking port is arranged at one end of the bending portion away from the partition net; An air outlet pipe is arranged at the upper end of the cylinder and communicated with the interior of the cylinder.

2. The flash evaporator according to claim 1, characterized in that: The liquid inlet pipe and the liquid outlet pipe are both fixedly connected to the top of the cylinder.

3. The flash evaporator according to claim 2, characterized in that: The liquid inlet pipe is provided with a first main body and a first bending portion, one end of the first main body is fixedly connected to the top of the cylinder, and the other end is connected to the first bending portion; the first bending portion is provided with a first liquid intake port at one end away from the first main body; the first liquid intake port is provided relative to the first main body away from the partition net; The liquid outlet pipe is provided with a second main body and a second bending portion, one end of the second main body is fixedly connected to the top of the cylinder, and the other end is connected to the second bending portion; a second liquid intake port is provided at one end of the second bending portion away from the second main body; the second liquid intake port is arranged away from the partition relative to the second main body.

4. The flash evaporator according to claim 3, characterized in that: The horizontal distance between the first liquid taking port and the second liquid taking port is 0.5-0.9 times of the diameter of the cylinder.

5. The flash evaporator according to claim 4, characterized in that: The included angle between the first main pipe and the first bending portion is 90 to 180 degrees; the included angle between the second main pipe and the second bending portion is 90 to 180 degrees.

6. The flash evaporator according to claim 5, characterized in that: The first main pipe body is provided with a first positioning portion, and the second main pipe body is provided with a second positioning portion, which are used to prevent the first main pipe body and the second main pipe body from rotating in the cylinder.

7. The flash evaporator according to any one of claims 3 to 6, characterized in that: The height of the partition is greater than the distance from the first liquid intake port to the bottom of the cylinder, and the height of the partition is greater than the distance from the second liquid intake port to the bottom of the cylinder; the partition is spaced apart from the air outlet pipe.

8. The flash evaporator according to claim 7, characterized in that: The partition net includes a layer of wire mesh; or, the partition net includes multiple layers of wire mesh, and a support frame is arranged between two adjacent layers of wire mesh.

9. The flash evaporator according to claim 8, characterized in that: The mesh number of the silk screen is 80 or more.

10. A heat pump system, characterized in that: include: The flash evaporator according to any one of claims 1 to 9.

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