Anti-cavitation device and fluorine pump air conditioning system

Abstract

The utility model discloses an anti-cavitation device and a fluorine pump air conditioning system.The anti-cavitation device is used for the fluorine pump air conditioning system and comprises a bypass pipeline, and one end of the bypass pipeline is connected with an outlet of a fluorine pump of the fluorine pump air conditioning system; and the other end of the connecting pipe is connected to a reflux inlet of a liquid storage tank of the fluorine pump air-conditioning system or connected to a liquid storage tank inlet pipe of the liquid storage tank. According to the anti-cavitation device and the fluorine pump air-conditioning system, the bypass pipeline is arranged between the fluorine pump outlet of the fluorine pump air-conditioning system and the liquid storage tank, and the refrigerant flows back into the liquid storage tank from the fluorine pump outlet by utilizing the high pressure of the fluorine pump outlet, so that the refrigerant in the liquid storage tank is not gasified due to the fact that the pressure in the liquid storage tank is not easy to drop quickly; therefore, the cavitation phenomenon of the fluorine pump can be reduced, the cutoff resistance and the cavitation resistance of a fluorine pump refrigerating circuit are greatly improved, the operation efficiency of the fluorine pump is improved, and the service life of the fluorine pump is long.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to an anti-cavitation device and a fluorine pump air-conditioning system. Background Art

[0002] In some refrigeration and air-conditioning application scenarios, such as data centers, using a natural cooling system instead of a vapor compression refrigeration system can significantly reduce the energy consumption of the system.

[0003] Fluorine pump air conditioning system is one of the most commonly used natural cooling systems. Fluorine pump air conditioning system often uses centrifugal pump as refrigerant delivery equipment. However, when the refrigerant pressure at the centrifugal pump (fluorine pump) inlet is low or the supercooling degree is low, it may cause more gaseous refrigerant at the fluorine pump inlet, resulting in fluorine pump cavitation.

[0004] On the one hand, fluorine pump cavitation will cause the centrifugal pump to lose head, resulting in refrigerant interruption, reducing the system's cooling capacity and affecting the temperature control effect. On the other hand, fluorine pump cavitation will cause fatigue, cracks, leakage and other problems in the impeller, volute and other parts of the centrifugal pump. In severe cases, it may even cause damage to the fluorine pump and reduce the operating reliability of the unit.

[0005] In the existing system, the impact of cavitation is reduced by increasing the height difference between the liquid storage tank and the fluorine pump, or reducing the flow resistance of the pipeline between the liquid storage tank and the fluorine pump.

[0006] In the process of implementing this application, the inventors found that there are at least the following problems in the prior art:

[0007] The above scheme has limited ability to reduce cavitation, and the anti-interference ability of the fluorine pump air conditioning system using the above scheme is still limited, and even a slight disturbance will cause cavitation of the fluorine pump.

[0008] Therefore, how to more effectively solve the cavitation problem of fluorine pumps is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0009] Based on this, the purpose of this application is to provide an anti-cavitation device and a fluorine pump air conditioning system to improve the cavitation problem of the fluorine pump existing in the prior art.

[0010] In order to achieve the above objectives, this application provides the following technical solutions:

[0011] On the one hand, the present application provides an anti-cavitation device for a fluorine pump air-conditioning system, the anti-cavitation device comprising a bypass pipe, one end of the bypass pipe being connected to the outlet of a fluorine pump of the fluorine pump air-conditioning system, and the other end being connected to the reflux port of a liquid storage tank of the fluorine pump air-conditioning system or to a liquid storage tank inlet pipe of the liquid storage tank.

[0012] In a possible design, the anti-cavitation device further includes a supercooling pipeline, and two ends of the supercooling pipeline are respectively connected to a liquid storage tank inlet pipe and a liquid storage tank outlet pipe of the liquid storage tank.

[0013] In a possible design, the liquid storage tank inlet pipe and the liquid storage tank outlet pipe are respectively arranged at the bottom of the liquid storage tank, the liquid storage tank inlet pipe is connected to the liquid inlet of the liquid storage tank, and the liquid storage tank outlet pipe is connected to the liquid outlet of the liquid storage tank;

[0014] One end of the bypass pipeline is connected to the inlet pipe of the liquid storage tank; or, the bottom of the liquid storage tank is provided with the reflux port, the reflux port is arranged close to the liquid inlet, and one end of the bypass pipeline is connected to the reflux port.

[0015] In a possible design, when the reflux port is provided at the bottom of the liquid storage tank, one end of the bypass line connected to the reflux port is flush with the reflux port or extends into the interior of the liquid storage tank.

[0016] In a possible design, a third control valve is provided on the subcooling pipeline, and / or a fourth control valve is provided on the bypass pipeline.

[0017] On the other hand, the present application provides a fluorine pump air conditioning system, comprising the anti-cavitation device as described above.

[0018] In a possible design, the fluorine pump air conditioning system also includes a liquid storage tank, a fluorine pump, a compressor, a condenser, an expansion valve, an evaporator, a first control valve and a second control valve; the compressor, the condenser, the liquid storage tank, the fluorine pump, the expansion valve and the evaporator are connected in sequence; the first control valve is connected in parallel to both ends of the fluorine pump, and the second control valve is connected in parallel to both ends of the compressor.

[0019] In a possible design, the liquid storage tank is arranged above the fluorine pump.

[0020] In a possible design, a shock absorbing structure is provided on the bypass pipeline.

[0021] In a possible design, the shock absorbing structure is formed by bending the bypass line.

[0022] Compared with the prior art, the anti-cavitation device and fluorine pump air conditioning system provided by the present application have at least the following advantages:

[0023] Beneficial effects:

[0024] The anti-cavitation device provided in the present application sets a bypass pipeline between the fluorine pump outlet and the liquid storage tank of the fluorine pump air-conditioning system, and utilizes the high pressure at the fluorine pump outlet to make the refrigerant flow back from the fluorine pump outlet to the liquid storage tank, so that the pressure in the liquid storage tank is not easy to drop rapidly, causing the refrigerant in the liquid storage tank to vaporize, thereby reducing the occurrence of fluorine pump cavitation, greatly improving the anti-interruption and anti-cavitation capabilities of the fluorine pump refrigeration circuit, improving the operating efficiency of the fluorine pump, and extending the service life of the fluorine pump.

[0025] The fluorine pump air conditioning system provided in the present application includes the above-mentioned anti-cavitation device, and therefore also has the same technical effect as the above-mentioned anti-cavitation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the connection structure of the fluorine pump air conditioning system according to an embodiment of the present application.

[0027] Figure 2 Schematic diagram of the structure of an anti-cavitation device according to an embodiment of the present application.

[0028] Figure 3 for Figure 2 A schematic structural diagram of the anti-cavitation device from another perspective.

[0029] Figure 4 This is a schematic structural diagram of an anti-cavitation device according to another embodiment of the present application.

[0030] Figure 5 This is a schematic diagram of the connection structure of a fluorine pump air conditioning system according to an embodiment of the present application.

[0031] Figure 6 This is a schematic diagram of the connection structure of a fluorine pump air conditioning system according to an embodiment of the present application.

[0032] Figure 7 This is a schematic diagram of the connection structure of a fluorine pump air conditioning system according to an embodiment of the present application.

[0033] Figure 8 This is a schematic diagram of the connection structure of a fluorine pump air conditioning system according to an embodiment of the present application.

[0034] Fig. 9 for Figure 4 A schematic structural diagram of the anti-cavitation device from another perspective.

[0035] Fig.10 for Fig. 9 Schematic diagram of the bypass pipeline structure.

[0036] The meanings of the symbols in the accompanying drawings are as follows:

[0037] 1. Compressor; 2. Condenser; 21. External fan; 3. Anti-cavitation device; 31. Bypass pipeline; 311. Shock absorption structure; 312. Fourth control valve; 32. Subcooling pipeline; 321. Third control valve; 4. Expansion valve; 5. Evaporator; 51. Internal fan; 6. First control valve; 7. Second control valve; 8. Liquid storage tank; 81. Liquid storage tank inlet pipe; 82. Liquid storage tank outlet pipe; 83. Liquid inlet; 84. Liquid outlet; 85. Reflux port; 9. Fluorine pump; 91. Fluorine pump outlet pipe. DETAILED DESCRIPTION

[0038] The technical solution of the present application is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the implementation of this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] See also Figure 1 and Figure 2The fluorine pump air conditioning system of the embodiment of the present application includes a compressor 1, a condenser 2, an expansion valve 4, an evaporator 5, a first control valve 6, a second control valve 7, a liquid storage tank 8 and a fluorine pump 9, and also includes an anti-cavitation device 3, and the anti-cavitation device 3 includes a supercooling pipeline 32 and a bypass pipeline 31. The compressor 1, the condenser 2, the liquid storage tank 8, the fluorine pump 9, the expansion valve 4 and the evaporator 5 are connected in sequence to form a refrigerant circulation loop. The first control valve 6 is connected to both ends of the fluorine pump 9, and the second control valve 7 is connected to both ends of the compressor 1.

[0043] In this embodiment, the condenser 2 and the evaporator 5 can both be coil heat exchangers, with an external fan 21 provided at the condenser 2 and an internal fan 51 provided at the evaporator 5. The expansion valve 4 of this embodiment can be an electronic expansion valve 4. The first control valve 6 and the second control valve 7 can both be solenoid valves. In other embodiments, the condenser 2 and the evaporator 5 can also be heat exchangers of other structures, such as microchannel heat exchangers, etc., and the specific structure of the heat exchanger is not limited.

[0044] The liquid storage tank 8 is provided with a liquid inlet 83 and a liquid outlet 84. The liquid inlet 83 is used to be connected to the outlet of the condenser 2 through the liquid storage tank inlet pipe 81, and the liquid outlet 84 is connected to the inlet of the fluorine pump 9 through the liquid storage tank outlet pipe 82. The liquid storage tank inlet pipe 81 and the liquid storage tank outlet pipe 82 are respectively arranged at the bottom of the liquid storage tank 8 and at the opposite ends of the liquid storage tank 8. The end of the liquid storage tank inlet pipe 81 can be extended into the liquid storage tank 8 (such as Figure 1 and Figure 8 As shown), the liquid storage tank outlet pipe 82 can also be extended into the liquid storage tank 8 (as shown in FIG. Figure 7 In this embodiment, the liquid storage tank 8 is arranged above the fluorine pump 9 and has a certain height difference with the fluorine pump 9. This design can make use of gravity to make the refrigerant liquid in the liquid storage tank 8 easier to reach the inlet of the fluorine pump 9, so as to reduce the cavitation phenomenon of the fluorine pump 9 to a certain extent. The liquid storage tank 8 in this embodiment is placed horizontally. In other embodiments, the liquid storage tank 8 can also be placed vertically. The liquid storage tank 8 can also be placed upright or inverted (such as Figure 7 The figure shows the liquid storage tank 8 in an inverted state. At this time, the liquid storage tank inlet pipe 81 and the liquid storage tank outlet pipe 82 are both connected to the top of the liquid storage tank 8. The liquid storage tank outlet pipe 82 can be extended into the interior of the liquid storage tank 8 to prevent the gas at the top of the liquid storage tank 8 from entering the fluorine pump 9 through the outlet of the liquid storage tank 8 and causing cavitation). The anti-cavitation device 3 of the present application can be used to achieve the purpose of preventing cavitation of the fluorine pump 9.

[0045] The two ends of the supercooling pipeline 32 are respectively connected to the liquid storage tank inlet pipe 81 and the liquid storage tank outlet pipe 82. The setting of the supercooling pipeline 32 can utilize the refrigerant liquid with a high degree of supercooling at the outlet of the condenser 2 to increase the degree of supercooling of the refrigerant at the inlet of the fluorine pump 9, thereby improving the ability of the fluorine pump 9 to resist interruption and cavitation, improving the operating efficiency of the fluorine pump 9, and extending the service life of the fluorine pump 9. In addition, a third control valve 321 can be installed on the supercooling pipeline 32 according to actual needs. The third control valve 321 can be a one-way valve, for example. The setting of the one-way valve can avoid the problem of lack of liquid in the liquid storage tank 8 when the fluorine pump 9 is started due to equipment installation, and avoid increasing the risk of cavitation in the fluorine pump 9. If not necessary, the third control valve 321 may not be configured.

[0046] One end of the bypass line 31 is connected to the outlet of the fluorine pump 9, and the other end is connected to the reflux port of the liquid storage tank 8. In order to meet the different needs of different scenarios, the bypass line 31 can be connected to the liquid storage tank 8 in a variety of ways, for example, Figure 1 and Figure 3 As shown, one end of the bypass line 31 is connected to the liquid storage tank inlet pipe 81 of the liquid storage tank 8, or, as shown in Figures 4 to 6 As shown, a reflux port 85 can be provided at the bottom of the liquid storage tank 8, and the reflux port 85 is provided close to the liquid inlet 83, and one end of the bypass line 31 is connected to the reflux port 85. When the reflux port 85 is provided at the bottom of the liquid storage tank 8, the end of the bypass line 31 can be provided flush with the reflux port 85 (such as Figure 5 , Figure 6 and Figure 7 Alternatively, the end of the bypass line 31 may extend into the interior of the liquid storage tank 8 (as shown in FIG. Figure 8As shown), the extension distance cannot be too long to prevent the bypass line 31 from affecting the operation of the system compressor single operation mode and the compressor fluorine pump mixed operation mode. If the bypass line 31 extends into the liquid storage tank 8 for a long distance, then in the compressor single operation mode, the refrigerant gas at the top of the liquid storage tank 8 may reach the fluorine pump outlet pipe 91 through the bypass line 31, and then reach the evaporator 5 through the expansion valve 4, which may cause the compressor 1 suction superheat fluctuation, the expansion valve 4 frequent adjustment and other problems, resulting in affecting the reliable operation of the compressor single operation mode and the compressor fluorine pump mixed operation mode. The connection point between the bypass line 31 and the liquid storage tank 8 is set at a position close to the liquid inlet 83 of the liquid storage tank 8 and away from the liquid outlet 84 of the liquid storage tank 8, that is, when the bypass line 31 is connected to the bottom of the liquid storage tank 8, the connection point between the bypass line 31 and the liquid storage tank 8 and the liquid outlet 84 of the liquid storage tank 8 are far away from each other. This design can prevent the bubbles generated by the fluorine pump 9 from entering the fluorine pump 9 through the bypass line 31, the liquid outlet 84 and the liquid storage tank outlet pipe 82, causing cavitation of the fluorine pump 9. In addition, bubbles are easily generated near the liquid outlet 84 due to flow resistance and local resistance. At the same time, due to the high pressure near the liquid outlet 84, impact is formed, and turbulence is easily formed. If it is too close to the liquid outlet 84, the inlet pressure of the fluorine pump 9 will be unstable.

[0047] A fourth control valve 312 may be installed on the bypass line 31 according to actual needs. The fourth control valve 312 may be, for example, a one-way valve, a ball valve, or a solenoid valve. Fig. 9 and Fig.10 As shown, a shock absorbing structure 311 may be provided on the bypass pipeline 31 to reduce the vibration force and stress effect on the bypass pipeline 31 during the transportation or operation of the unit. The shock absorbing structure 311 may be, for example, one or more annular bends (similar to a spring) formed by bending the bypass pipeline 31, so that the bypass pipeline 31 has a certain elasticity and plays a certain shock absorbing role.

[0048] The bypass line 31 can use the high-pressure refrigerant at the outlet of the fluorine pump 9 to increase the pressure of the refrigerant in the liquid storage tank 8, thereby increasing the pressure of the refrigerant at the inlet of the fluorine pump 9, improving the anti-interruption and anti-cavitation capabilities of the fluorine pump in the single operation mode, and improving the operating efficiency and service life of the fluorine pump 9.

[0049] The operation modes of the fluorine pump air conditioning system of the embodiment of the present application include a compressor single operation mode, a compressor fluorine pump mixed operation mode and a fluorine pump single operation mode.

[0050] The working principle of the compressor single operation mode is as follows: the fluorine pump 9 is stopped, the compressor 1 is started, the first control valve 6 is opened, and the second control valve 7 is closed. The compressor 1, the condenser 2, the liquid storage tank 8, the expansion valve 4, the first control valve 6 and the evaporator 5 form a refrigeration circuit.

[0051] The working principle of the compressor-fluorine pump hybrid operation mode is as follows: the fluorine pump 9 is started, the compressor 1 is started, the first control valve 6 is closed, and the second control valve 7 is closed. The compressor 1, the condenser 2, the liquid storage tank 8, the fluorine pump 9, the expansion valve 4 and the evaporator 5 form a refrigeration circuit. The compressor-fluorine pump hybrid operation mode can partially utilize the natural cold source and has a certain energy-saving effect.

[0052] The working principle of the fluorine pump single operation mode is as follows: the fluorine pump 9 is started, the compressor 1 is stopped, the first control valve 6 is closed, and the second control valve 7 is opened. The fluorine pump 9, the expansion valve 4, the evaporator 5, the second control valve 7, the condenser 2 and the liquid storage tank 8 form a fluorine pump refrigeration circuit. The fluorine pump single operation mode can shut down the compressor 1, use the natural cold source for cooling, and reduce the operating energy consumption of the system.

[0053] The fluorine pump air conditioning system and anti-cavitation device of the embodiments of the present application adopt a fluorine pump anti-cavitation scheme which can not only effectively prevent cavitation from occurring in the fluorine pump when the fluorine pump is in single operation mode, but also has no adverse effect on the compressor single operation mode and the compressor-fluorine pump mixed operation mode.

[0054] The fluorine pump air conditioning system and anti-cavitation device of the embodiment of the present application add a bypass pipeline between the fluorine pump outlet pipe and the liquid storage tank inlet pipe or the liquid return port of the liquid storage tank, and the high-pressure refrigerant at the fluorine pump outlet can be used to increase the pressure of the refrigerant in the liquid storage tank, and increase the liquid pressure of the refrigerant at the inlet of the fluorine pump. In addition, a supercooling pipeline with a one-way valve is added between the liquid storage tank inlet pipe and the liquid storage tank outlet pipe, and the refrigerant liquid with a high degree of supercooling at the condenser outlet can be used to increase the supercooling of the refrigerant at the inlet of the fluorine pump. These measures jointly improve the anti-interruption and anti-cavitation capabilities of the fluorine pump, thereby improving the operating efficiency of the fluorine pump and extending the service life of the fluorine pump. In addition, a one-way valve is installed on the supercooling pipeline to avoid the lack of liquid in the liquid storage tank when the fluorine pump is started due to equipment installation, which increases the risk of cavitation in the fluorine pump. When designing the scheme, this application comprehensively considered the characteristics of the fluorine pump air-conditioning system with multiple operating modes. The fluorine pump anti-cavitation technical scheme adopted can not only effectively prevent the occurrence of cavitation when the fluorine pump is in the single operation mode, but also will not have an adverse effect on the compressor single operation mode and the compressor-fluorine pump mixed operation mode.

[0055] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0056] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An anti-cavitation device for a fluorine pump air conditioning system, characterized in that: It comprises a bypass pipeline and a supercooling pipeline, wherein one end of the bypass pipeline is connected to the outlet of the fluorine pump of the fluorine pump air conditioning system; The inlet pipe of the liquid storage tank is arranged at the bottom of the liquid storage tank, and the other end of the bypass pipeline is connected to the inlet pipe of the liquid storage tank; or, the inlet pipe of the liquid storage tank is connected to the liquid inlet of the liquid storage tank, a reflux port is arranged at the bottom of the liquid storage tank, the reflux port is arranged close to the liquid inlet, and the other end of the bypass pipeline is connected to the reflux port; Two ends of the supercooling pipeline are respectively connected to a liquid storage tank inlet pipe and a liquid storage tank outlet pipe of the liquid storage tank.

2. The anti-cavitation device according to claim 1, characterized in that: The liquid storage tank outlet pipe is arranged at the bottom of the liquid storage tank, and the liquid storage tank outlet pipe is connected to the liquid outlet of the liquid storage tank.

3. The anti-cavitation device according to claim 2, characterized in that: When the reflux port is provided at the bottom of the liquid storage tank, one end of the bypass pipeline connected to the reflux port is flush with the reflux port or extends into the interior of the liquid storage tank.

4. The anti-cavitation device according to claim 1, characterized in that: The subcooling pipeline is provided with a third control valve, and / or the bypass pipeline is provided with a fourth control valve.

5. A fluorine pump air conditioning system, characterized in that: Comprising the anti-cavitation device according to any one of claims 1 to 4.

6. The fluorine pump air conditioning system according to claim 5, characterized in that: It also includes a liquid storage tank, a fluorine pump, a compressor, a condenser, an expansion valve, an evaporator, a first control valve and a second control valve; the compressor, the condenser, the liquid storage tank, the fluorine pump, the expansion valve and the evaporator are connected in sequence; the first control valve is connected in parallel to both ends of the fluorine pump, and the second control valve is connected in parallel to both ends of the compressor.

7. The fluorine pump air conditioning system according to claim 6, characterized in that: The liquid storage tank is arranged above the fluorine pump.

8. The fluorine pump air conditioning system according to claim 6, characterized in that: The bypass pipeline is provided with a shock absorbing structure.

9. The fluorine pump air conditioning system according to claim 8, characterized in that: The shock absorbing structure is formed by bending the bypass pipeline.

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