Refrigeration system equalization tank

Abstract

The application relates to the technical field of heat pump systems, in particular to a refrigeration system balance tank which comprises a tank body, a high-pressure liquid storage connecting pipe is arranged at the bottom of the tank body, connecting feet are symmetrically arranged at the bottom of the tank body, further comprises a low-pressure liquid storage assembly, the low-pressure liquid storage assembly is arranged in the tank body, a liquid inlet and a liquid outlet are arranged on the side wall of the tank body, the two ends of the low-pressure liquid storage assembly are connected with the liquid inlet and the liquid outlet respectively, and the liquid inlet and the liquid outlet are used for being connected with the low-pressure side of the refrigeration system; in the application, the low-pressure liquid storage assembly and an electric heating assembly are arranged, under the working condition that the system refrigerant is insufficient, the electric heating assembly can heat the refrigerant in the tank body, so that the refrigerant can flow out quickly, under the working condition that the system refrigerant is excessive, the low-pressure liquid storage assembly can make the refrigerant entering the tank body condense quickly, compared with the traditional balance tank, the application can fully improve the working efficiency of the tank body balance refrigerant, and can realize active control and adjustment of the refrigerant amount of the refrigeration system.

Description

Technical Field

[0001] This invention relates to the field of heat pump system technology, specifically to a refrigeration system balance tank. Background Technology

[0002] In air conditioning or heat pump systems, the balance tank is a key auxiliary component that ensures stable system operation. Its core function is to balance the fluctuations in refrigerant capacity within the system. Because the refrigerant demand of air conditioners and heat pumps varies under different operating conditions, the balance tank can prevent the system from experiencing excessive pressure due to excess refrigerant or compressor idling due to insufficient refrigerant by storing or releasing refrigerant.

[0003] Most existing refrigeration system balance tanks adopt a cylindrical sealed tank structure with a single hollow interior. The tank wall typically has an inlet, an outlet, and a gas inlet. Some also include a level sensor to monitor the refrigerant level. During installation, the balance tank is generally placed in the refrigerant piping between the condenser and evaporator of the system. Its refrigerant balancing principle is as follows: when the system has excess refrigerant, the excess refrigerant enters the balance tank through the inlet for temporary storage, reducing the pressure in the piping; when the system has insufficient refrigerant, the temporarily stored refrigerant in the tank flows back to the main piping through the outlet under the influence of the system pressure difference, replenishing the refrigerant consumed and achieving a supply-demand balance.

[0004] However, existing balance tanks have significant shortcomings, the core problem being low refrigerant inflow and outflow efficiency. Specifically, when the system refrigerant is insufficient, because the tank's internal cavity is a single empty cavity, the refrigerant is discharged solely through the natural pressure difference between the pipes and the tank. This results in slow refrigerant flow, failing to quickly respond to system demands and easily causing short-term refrigerant supply shortages to the compressor, affecting cooling / heating performance. Conversely, when the system has excessive refrigerant, the excess refrigerant entering the balance tank also suffers from slow filling speed, preventing the pressure in the pipes from dropping quickly and potentially causing system pressure overload, increasing equipment operational risks. Therefore, this invention proposes a refrigeration system balance tank to effectively address these drawbacks. Summary of the Invention

[0005] The purpose of this invention is to provide a refrigeration system balance tank to solve the problems mentioned in the background art.

[0006] This invention is achieved through the following technical solution: a refrigeration system balance tank, comprising a tank body, a high-pressure liquid storage connection pipe provided at the bottom of the tank body, and symmetrically provided connecting feet on both sides of the bottom of the tank body, and further comprising:

[0007] A low-pressure liquid storage assembly is located inside a tank. The side wall of the tank is provided with an inlet and an outlet. Both ends of the low-pressure liquid storage assembly are connected to the inlet and the outlet, respectively, and the inlet and the outlet are used to connect to the low-pressure side of the refrigeration system.

[0008] An electric heating assembly is disposed inside the tank.

[0009] The high-pressure liquid storage connection pipe is used to connect to the high-pressure side of the refrigeration system, and a solenoid valve is also provided on the high-pressure liquid storage connection pipe.

[0010] Optionally, the low-pressure liquid storage component is in the shape of a spiral coil and is made of copper.

[0011] Optionally, the low-pressure liquid storage assembly includes a number of heat-conducting plates, which are arranged vertically at intervals. Each heat-conducting plate has an outer cavity and an inner cavity, which are interconnected. The outer cavities of two adjacent heat-conducting plates are connected in sequence, and the inner cavities of two adjacent heat-conducting plates are connected in sequence. The outer cavity and inner cavity of the heat-conducting plate are respectively connected to the liquid inlet and the liquid outlet.

[0012] Optionally, the heat-conducting plate has a ring-shaped structure and a rectangular cross-section.

[0013] Optionally, the heat-conducting plate is composed of a heat-insulating ring, an outer copper ring, a hard ring, and an inner copper ring nested from the outside to the inside. Both the outer copper ring and the inner copper ring are hollow ring structures, and the inner cavities of the outer copper ring and the inner copper ring respectively constitute the outer cavity and the inner cavity.

[0014] Optionally, a hidden groove is provided on the opposite surface of two adjacent heat conduction plates. The hidden groove is provided on the heat insulation ring. An extension spring is also provided between two adjacent heat conduction plates. The two ends of the extension spring are respectively connected to the hidden grooves of the two adjacent heat conduction plates.

[0015] Optionally, an installation ring is provided in the middle of the tank, and several guide rods are vertically movably inserted through the installation ring. Several guide holes are opened through the rigid ring for the guide rods to pass through. The guide rods pass through the guide holes and are fixedly connected to the heat-conducting plate located at the bottom. The tops of the several guide rods are connected to a counterweight iron ring.

[0016] An electromagnet is provided above the counterweight ring. When the electromagnet is de-energized, the counterweight ring is in contact with the top wall of the mounting ring, and there is a gap between the heat-conducting plates. When the electromagnet is energized, the counterweight ring is in contact with the electromagnet, and the heat-conducting plates are also in contact with each other.

[0017] Optionally, a heat insulation ring is fitted to the inner ring wall of the heat-conducting plate, and a heat insulation layer is fitted to the bottom surface of the bottommost heat-conducting plate.

[0018] Optionally, the outer cavities of two adjacent heat-conducting plates are connected by an outer flexible hose, and the inner cavities of two adjacent heat-conducting plates are connected by an inner flexible hose.

[0019] Optionally, a liquid inlet conduit is provided on the topmost heat-conducting plate, and a liquid outlet conduit is provided on the bottom surface of the bottommost heat-conducting plate. The liquid inlet conduit communicates with the outer cavity, and the liquid outlet conduit communicates with the inner cavity. The liquid inlet conduit and the liquid outlet conduit are connected to each other through a flexible tube and a liquid inlet and a liquid outlet, respectively.

[0020] Compared with the prior art, the present invention provides a refrigeration system balance tank, which has the following beneficial effects:

[0021] 1. This invention includes a low-pressure liquid storage component and an electric heating component. When the system refrigerant is insufficient, the electric heating component can heat the refrigerant in the tank and make it flow out quickly. When the system refrigerant is excessive, the low-pressure liquid storage component can make the refrigerant entering the tank condense quickly. Compared with the traditional balance tank, this invention can significantly improve the working efficiency of the tank in balancing the refrigerant.

[0022] 2. In this invention, the low-pressure liquid storage component is connected to the low-pressure side of the system. Therefore, the refrigerant in the low-pressure liquid storage component is a low-temperature, low-pressure gas. Thus, this invention does not require an additional refrigeration mechanism to cool the refrigerant. This not only helps to reduce the manufacturing cost of this invention, but also accelerates the entry of the refrigerant into the tank without increasing power consumption, which helps to save energy and reduce emissions.

[0023] 3. The low-pressure liquid storage assembly in this invention includes several heat-conducting plates stacked sequentially. When the electric heating assembly is heating up, the several low-pressure liquid storage assemblies can be pulled upwards and merged to prevent the electric heating assembly from heating the refrigerant in the low-pressure liquid storage assembly and affecting the cooling effect of the refrigerant. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a cross-sectional view of the structure according to Embodiment 1 of the present invention;

[0026] Figure 3 This is a cross-sectional view of the first state of Embodiment 2 of the present invention;

[0027] Figure 4 This is a cross-sectional view of the second state of Embodiment 2 of the present invention;

[0028] Figure 5 This is a schematic diagram of the low-pressure liquid storage component in Embodiment 2 of the present invention;

[0029] Figure 6 This is a cross-sectional view of the low-pressure liquid storage component according to Embodiment 2 of the present invention;

[0030] Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0031] In the diagram: 100, Tank body; 101, High-pressure liquid storage connection pipe; 102, Solenoid valve; 103, Liquid inlet; 104, Liquid outlet; 105, Mounting ring; 106, Guide rod; 107, Counterweight iron ring; 108, Electromagnet; 200, Low-pressure liquid storage assembly; 201, Heat-conducting plate; 2011, Heat insulation ring; 2012, Outer copper ring; 2013, Hard ring; 2014, Inner copper ring; 202, Outer cavity; 203, Inner cavity; 204, Hidden groove; 205, Extension spring; 206, Heat insulation ring; 207, Heat insulation layer; 208, Outer hose; 209, Inner hose; 210, Liquid inlet conduit; 211, Liquid outlet conduit; 300, Electric heating assembly. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figure 1 and Figure 2 This application proposes a refrigeration system balancing tank, including a tank body 100. A high-pressure liquid storage connection pipe 101 is provided at the bottom of the tank body 100, and connecting feet are symmetrically provided on both sides of the bottom of the tank body 100. The high-pressure liquid storage connection pipe 101 is used to connect to the high-pressure side of the refrigeration system, and a solenoid valve 102 is also provided on the high-pressure liquid storage connection pipe 101 to control its opening and closing. This embodiment also includes a low-pressure liquid storage component 200 and an electric heating component 300. Specifically, the low-pressure liquid storage component 200 is located inside the tank body 100. An inlet 103 and an outlet 104 are provided on the side wall of the tank body 100. The two ends of the low-pressure liquid storage component 200 are respectively connected to the inlet 103 and the outlet 104, and the inlet 103 and the outlet 104 are used to connect to the low-pressure side of the refrigeration system.

[0034] It should be noted that in air conditioning or heat pump systems, the compressor's outlet is the high-pressure side, and its inlet is the low-pressure side. Specifically, the compressor discharges refrigerant in a high-temperature, high-pressure state, which, after heat exchange in the condenser, becomes a high-pressure liquid. This liquid then passes through the expansion valve to form a low-temperature, gas-liquid mixture, which then passes through the evaporator to form a low-pressure gas and returns to the compressor. In this embodiment, the high-pressure liquid receiver connecting pipe 101 can be specifically installed on the pipeline connecting the condenser and the expansion valve, while the liquid inlet 103 and liquid outlet 104 are connected in series on the pipeline connecting the evaporator and the compressor.

[0035] In this embodiment, the low-pressure liquid storage component 200 is in the shape of a spiral coil and is made of copper; this increases the contact area, and the copper material facilitates heat dissipation. Additionally, the electric heating component 300 is located inside the tank 100. When energized, it heats the refrigerant inside the tank 100, increasing the internal pressure and facilitating the refrigerant's return to the refrigeration system.

[0036] In summary, in practical applications, when the refrigerant in the refrigeration system is balanced, the solenoid valve 102 remains closed, ensuring the refrigeration system maintains a relatively efficient and stable state. When there is excessive refrigerant in the system, the solenoid valve 102 opens, and the refrigerant on the high-pressure side of the system automatically fills the balance tank. Simultaneously, due to the presence of the low-pressure liquid receiver 200, the low-temperature liquid receiver 200 exchanges heat with the refrigerant in the tank 100, thereby rapidly condensing the refrigerant liquid and reducing the amount of refrigerant in the system, achieving balance.

[0037] When the refrigerant in the refrigeration system is insufficient, the solenoid valve 102 is opened, and the refrigerant in the tank 100 is quickly discharged under its own pressure. At the same time, the electric heating component 300 is turned on, which causes the temperature of the refrigerant to rise rapidly, so that the refrigerant in the tank 100 can be discharged even more quickly, thus achieving rapid replenishment of the refrigerant.

[0038] In summary, compared to the traditional balance tank, this embodiment adds a low-pressure liquid storage component 200 and an electric heating component 300. These two components can further improve the efficiency of balancing the refrigerant when there is too much or too little refrigerant in the system. This reduces the problem of system pressure not dropping quickly, which may cause system pressure overload, and avoids the problem of insufficient refrigerant supply to the compressor in a short period of time due to the system pressure not rising quickly.

[0039] Example 2: Please refer to Figure 3 - Figure 7 This application also proposes a refrigeration system balance tank. The difference between this embodiment and Embodiment 1 is that the low-pressure liquid storage assembly 200 includes a plurality of heat-conducting discs 201, which are arranged vertically at intervals. Each heat-conducting disc 201 has an outer cavity 202 and an inner cavity 203, which are interconnected. The outer cavities of adjacent heat-conducting discs 201 are sequentially connected, and the inner cavities of adjacent heat-conducting discs 201 are sequentially connected. The outer and inner cavities of the heat-conducting discs 201 are connected to the liquid inlet 103 and the liquid outlet 104, respectively. Therefore, the refrigerant entering through the liquid inlet 103 can enter the outer cavities 202 and then flow back to the liquid outlet 104 through the inner cavities 203.

[0040] The structure of the heat-conducting plate 201 is described in detail below:

[0041] The heat-conducting plate 201 has a ring-shaped structure and a rectangular cross-section. This means that several heat-conducting plates 201, when bonded together, can form a ring with increased thickness. The heat-conducting plate 201 is composed of a heat-insulating ring 2011, an outer copper ring 2012, a rigid ring 2013, and an inner copper ring 2014, nested sequentially from the outside to the inside. Both the outer copper ring 2012 and the inner copper ring 2014 are hollow ring structures. The cavities of the outer copper ring 2012 and the inner copper ring 2014 respectively form the outer cavity 202 and the inner cavity 203. Both the outer copper ring 2012 and the inner copper ring 2014 are made of plastic, which has good thermal conductivity. In contrast, the heat-insulating ring 2011 and the rigid ring 2013 are made of plastic, which has poor thermal conductivity.

[0042] It should be added that there is a hard ring 2013 between the outer copper ring 2012 and the inner copper ring 2014. The hard ring 2013 has a through hole (not shown in the figure) that allows the outer cavity 202 and the inner cavity 203 to communicate. That is, the refrigerant entering the outer cavity 202 can enter the inner cavity 203 through the through hole.

[0043] Furthermore, each of the two adjacent heat-conducting plates 201 has a hidden groove 204 on its opposite surface. The hidden groove 204 is located on the heat insulation ring 2011. A tension spring 205 is also provided between the two adjacent heat-conducting plates 201, with both ends of the tension spring 205 connected to the hidden grooves 204 of the two adjacent heat-conducting plates 201. The function of the tension spring 205 is to maintain a gap between the two adjacent heat-conducting plates 201, thereby allowing the outer copper ring 2012 and the inner copper ring 2014 to make more sufficient contact with the refrigerant in the tank 100. Simultaneously, the hidden groove 204 serves to accommodate the tension spring 205. When the two adjacent heat-conducting plates 201 are pressed together under external force, the tension spring 205 can retract into the hidden groove 204. In addition, there are three tension springs 205 between the two adjacent heat-conducting plates 201, and the three tension springs 205 are distributed circumferentially.

[0044] In addition, an installation ring 105 is provided in the middle section of the tank body 100. Several guide rods 106 are vertically movably inserted through the installation ring 105. Several guide holes are opened through the rigid ring 2013 for the guide rods 106 to pass through. The guide rods 106 pass through the guide holes and are fixedly connected to the heat-conducting plate 201 located at the bottom. The top ends of the several guide rods 106 are connected to a counterweight iron ring 107. An electromagnet 108 is provided above the counterweight iron ring 107. When the electromagnet 108 is de-energized, the counterweight iron ring 107 is always in contact with the top wall of the installation ring 105 under the action of gravity, and there are gaps between the several heat-conducting plates 201. When the electromagnet 108 is energized, the counterweight iron ring 107 is in contact with the electromagnet 108, and under the pulling action of the guide rods 106, the several heat-conducting plates 201 are also in contact with each other, and the heat-conducting plate 201 located at the top is in contact with the lower surface of the installation ring 105.

[0045] It is worth mentioning that a heat insulation ring 206 is fitted to the inner ring wall of the heat-conducting plate 201, and a heat insulation layer 207 is fitted to the bottom surface of the bottommost heat-conducting plate 201. Both the heat insulation layer 207 and the heat insulation ring 206 are made of plastic. When the electromagnet 108 is energized, several heat-conducting plates 201 overlap each other. At this time, the heat insulation layer 207 and the heat insulation ring 206 can bend to prevent the outer copper ring 2012 and the inner copper ring 2014 from contacting the refrigerant in the tank 100, thereby preventing the heat from the electric heating component 300 from being transferred to the refrigerant in the heat-conducting plate 201.

[0046] It should be added that the outer cavities of two adjacent heat-conducting plates 201 are connected by an outer flexible tube 208, and the inner cavities 203 of two adjacent heat-conducting plates 201 are connected by an inner flexible tube 209. A liquid inlet conduit 210 is provided on the topmost heat-conducting plate 201, and a liquid outlet conduit 211 is provided on the bottom surface of the bottommost heat-conducting plate 201. Figure 5 As shown, the inlet conduit 210 communicates with the outer cavity 202, and the outlet conduit 211 communicates with the inner cavity 203. The inlet conduit 210 and the outlet conduit 211 are connected to the inlet port 103 and the outlet port 104 respectively via flexible tubes. It is worth mentioning that the mounting ring 105 has a notch for the inlet conduit 210 and the outlet conduit 211 to pass through. When the electromagnet 108 is energized, both the inlet conduit 210 and the outlet conduit 211 can penetrate the mounting ring 105 until the heat-conducting plate 201 at the top side contacts the lower surface of the mounting ring 105.

[0047] In addition, since the inlet pipe 210 and the outlet pipe 211 are connected to the inlet 103 and the outlet 104 respectively through the flexible pipe, when the heat conduction plate 201 moves up and down, the flexible pipe can always ensure that the refrigerant enters the outer cavity 202 through the inlet 103 and then flows back to the outlet 104 through the inner cavity 203.

[0048] When there is too much refrigerant in the system, the electromagnet 108 is de-energized, and at this time, several heat-conducting plates 201 are in the deployed state, such as... Figure 3 As shown, its function is to increase the contact area between the outer copper ring 2012, the inner copper ring 2014 and the refrigerant, so that the two can exchange heat, which helps the refrigerant entering the tank 100 to condense quickly and improve the refrigerant balance efficiency.

[0049] When the refrigerant in the system is insufficient, the electromagnet 108 is energized, and at this time, several heat-conducting plates 201 are in a closed state, such as... Figure 4 As shown, its function is to prevent the outer copper ring 2012 and inner copper ring 2014 from being exposed, and to prevent the electric heating assembly 300 from significantly affecting the refrigerant temperature inside the heat-conducting plate 201. The reason is that if the electric heating assembly 300 significantly increases the refrigerant temperature inside the heat-conducting plate 201, it will cause the temperature and pressure of the gas drawn into the compressor to rise. This will not only lead to an abnormal increase in system pressure, increasing the load on pipelines and components, but also increase system power consumption and shorten the service life of various system components.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A refrigeration system equalizing tank, comprising a tank body (100), a high-pressure liquid storage connecting pipe (101) is arranged at the bottom of the tank body (100), and connecting feet are symmetrically arranged at both sides of the bottom of the tank body (100), characterized in that, Also include: The low-pressure liquid storage assembly (200) is located in the inside of the tank body (100), the sidewall of the tank body (100) is provided with liquid inlet (103) and liquid outlet (104), the two ends of the low-pressure liquid storage assembly (200) are connected with liquid inlet (103) and liquid outlet (104) respectively, and the liquid inlet (103) and the liquid outlet (104) are used to be connected with the low-pressure side of the refrigeration system; Electric heating assembly (300), the electric heating assembly (300) is arranged in the inside of the tank body (100); Wherein, the high-pressure liquid storage connecting pipe (101) is used for connecting with the high-pressure side of the refrigeration system, and the electromagnetic valve (102) is further arranged on the high-pressure liquid storage connecting pipe (101); The low-pressure liquid storage assembly (200) includes a plurality of heat-conducting plates (201), a plurality of heat-conducting plates (201) are distributed in vertical direction, the inside of the heat-conducting plate (201) has an outer cavity (202) and an inner cavity (203), the outer cavity (202) and the inner cavity (203) are communicated with each other, the outer cavities of the adjacent two heat-conducting plates (201) are connected in sequence, the inner cavities (203) of the adjacent two heat-conducting plates (201) are connected in sequence, and the outer cavities and the inner cavities of the heat-conducting plates (201) are connected with the liquid inlet (103) and the liquid outlet (104) respectively; The heat-conducting plate (201) is composed of a heat insulation ring (2011), an outer copper ring (2012), a hard ring (2013) and an inner copper ring (2014) from outside to inside, the outer copper ring (2012) and the inner copper ring (2014) are both hollow ring structure, the inner cavities of the outer copper ring (2012) and the inner copper ring (2014) form the outer cavity (202) and the inner cavity (203) respectively; The opposite surfaces of the adjacent two heat-conducting plates (201) are provided with hidden grooves (204), the hidden grooves (204) are arranged on the heat insulation ring (2011), and the adjacent two heat-conducting plates (201) are further provided with extension springs (205), the two ends of the extension spring (205) are connected in the hidden grooves (204) of the adjacent two heat-conducting plates (201) respectively; The inside of the tank body (100) is provided with a mounting ring (105) at the middle position, a plurality of guide rods (106) are vertically movably arranged on the mounting ring (105), a plurality of guide holes are arranged on the hard ring (2013) for the guide rods (106) to pass through, the guide rods (106) pass through the guide holes and are fixedly connected with the heat-conducting plate (201) at the bottom side, and the top ends of the guide rods (106) are connected with a counterweight iron ring (107). The upper portion of the counterweight iron ring (107) is provided with an electromagnet (108), when the electromagnet (108) is powered off, the counterweight iron ring (107) is attached to the top wall of the mounting ring (105), and the plurality of heat-conducting plates (201) have gaps between them; when the electromagnet (108) is powered on, the counterweight iron ring (107) is attached to the electromagnet (108), and the plurality of heat-conducting plates (201) are also attached to each other.

2. A refrigeration system equalization tank as set forth in claim 1 wherein: The low-pressure liquid storage assembly (200) is made of red copper.

3. A refrigeration system equalization tank as set forth in claim 1 wherein: The heat-conducting plates (201) are annular structures, and the cross section of the heat-conducting plates (201) is rectangular.

4. A refrigeration system equalizing tank as set forth in claim 1 wherein: The inner ring wall of the heat-conducting plates (201) is attached with a heat insulation ring (206), and the bottom surface of the heat-conducting plate (201) at the bottom side is attached with a heat insulation layer (207).

5. A refrigeration system equalizing tank as set forth in claim 1 wherein: The outer cavities between the adjacent two heat-conducting plates (201) are connected through an outer hose (208), and the inner cavities (203) between the adjacent two heat-conducting plates (201) are connected through an inner hose (209).

6. A refrigeration system equalizing tank as set forth in claim 1 wherein: The heat-conducting plate (201) at the top side is provided with an inlet guide pipe (210), and the bottom surface of the heat-conducting plate (201) at the bottom side is provided with an outlet guide pipe (211), the inlet guide pipe (210) is communicated with the outer cavity (202), the outlet guide pipe (211) is communicated with the inner cavity (203), and the inlet guide pipe (210) and the outlet guide pipe (211) are respectively connected with the flexible pipe and the inlet (103) and the outlet (104) through the flexible pipe.

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