An anti-cavitation refrigeration system

Abstract

The present invention discloses an anti-cavitation refrigeration system, which specifically includes a condenser, an evaporator, a liquid storage device and a pump unit; the condensation outlet of the condenser is connected to the liquid storage inlet of the liquid storage device, the liquid storage outlet of the liquid storage device is connected to the pump body inlet of the pump unit, and the pump body outlet of the pump unit is connected to the evaporation inlet of the evaporator; the pump body inlet of the pump unit is also connected to a cooling component, a refrigerant flows in the cooling component, and the cooling component is connected to the condenser. When the anti-cavitation refrigeration system of the present invention is started, the fan of the condenser is started first, and the pressure of the internal pipeline of the condenser decreases under the action of the fan, and the cooling component is connected to the condenser, and the pressure in the cooling component is also reduced accordingly, so that the refrigerant in the cooling component evaporates and absorbs heat, and then the refrigerant in the cooling component evaporates and takes away the heat of the pipeline at the pump body inlet, thereby preventing the appearance of gas at the inlet of the pump unit, avoiding the occurrence of cavitation, and extending the overall life of the pump unit.

Description

Technical Field

[0001] The invention relates to the field of refrigeration equipment, and in particular to an anti-cavitation refrigeration system. Background Art

[0002] Refrigeration equipment refers to a device that achieves indoor and outdoor heat exchange through evaporation and condensation of refrigerant circulation heat. Cavitation refers to the phenomenon that the liquid at the pump port is affected by the pressure reduction, escaping a large amount of vapor and mixing with the gas to form many small bubbles. The bubbles then burst and condense on the metal surface of the blades, hitting the blade surface with a large force, causing the blade to be damaged and vibrate.

[0003] In the prior art, refrigeration systems such as fluorine pump systems are used to cool down data centers. The main principle is to set a pump unit such as a fluorine pump between the condenser and the evaporator. The pump unit plays the role of transferring the refrigerant condensed by the condenser to the evaporator, and then the evaporator cools the data center to meet the refrigeration needs of the data center. However, for the refrigeration system, when it is just started, the pressure in the pipe is reduced, and the pressure reduction and evaporation phenomenon occurs, that is, gas appears in the pipeline, and these gases will cause cavitation to the pump unit. After long-term operation, it will damage the impeller and motor of the pump unit, reducing the service life of the pump unit. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-cavitation refrigeration system to solve the problem of cavitation occurring when the current refrigeration system is started.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An anti-cavitation refrigeration system comprises a condenser, an evaporator, a liquid storage device and a pump unit, wherein the condenser comprises a condensation pipeline and a fan for cooling the condensation pipeline, the condensation pipeline is connected with the liquid storage device, a refrigerant is stored in the liquid storage device, and the pump unit is used to transport the refrigerant in the liquid storage device to the evaporator;

[0007] The condensation outlet of the condensation pipeline is communicated with the liquid storage inlet of the liquid storage device, the liquid storage outlet of the liquid storage device is communicated with the pump body inlet of the pump body unit, the pump body outlet of the pump body unit is communicated with the evaporation inlet of the evaporator; the evaporation outlet of the evaporator is communicated with the condensation inlet of the condensation pipeline;

[0008] The pump body inlet of the pump body unit is also connected to a cooling component, and the cooling component is used to cool the refrigerant flowing to the pump body inlet. The refrigerant flows in the cooling component, and the cooling component is connected to the condensation pipe.

[0009] Optionally, the cooling component includes a first pipeline and a second pipeline;

[0010] The first pipeline inlet of the first pipeline is connected to the liquid storage outlet of the liquid storage device, and the first pipeline outlet of the first pipeline is connected to the pump body inlet of the pump body unit;

[0011] The second pipe inlet of the second pipe is connected to the liquid storage outlet of the liquid storage device, the second pipe outlet of the second pipe is connected to the condenser, and the second pipe can exchange heat with the first pipe.

[0012] Optionally, the second pipe outlet of the second pipe is communicated with the condensation outlet of the condenser.

[0013] Optionally, the second pipe forms a flow channel portion between the second pipe inlet and the second pipe outlet, and the first pipe passes through the flow channel portion.

[0014] Optionally, the first pipeline is formed with a flow guide at the first pipeline inlet and the first pipeline outlet respectively;

[0015] A cross-sectional area of ​​a first end portion of the flow guide portion close to the first pipe is larger than a cross-sectional area of ​​a second end portion of the flow guide portion away from the first pipe.

[0016] Optionally, a solenoid valve is provided between the second pipe inlet of the second pipe and the liquid storage device, and the solenoid valve is used to connect the second pipe and the liquid storage device when the fan is started.

[0017] Optionally, a main control unit is further included, a first pressure sensor is provided at a pump body inlet of the pump body unit, and a second pressure sensor is provided at a pump body outlet of the pump body unit;

[0018] The main control unit is electrically connected to the first pressure sensor, the second pressure sensor and the solenoid valve respectively, and is used to close the solenoid valve when the pressure difference between the first pressure sensor and the second pressure sensor is greater than a preset pressure threshold for a duration exceeding a preset time value.

[0019] Optionally, the pump body unit is connected in parallel with a one-way valve.

[0020] Optionally, a compressor is connected between the evaporation outlet of the evaporator and the condensation inlet of the condenser, and a one-way valve is connected in parallel to the compressor.

[0021] Optionally, the pump unit is a fluorine pump.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The anti-cavitation refrigeration system of the present invention starts up, and the fan of the condenser starts up, and the internal pressure of the condensation pipe drops, while the cooling component is connected to the condensation pipe, and the pressure in the cooling component is also reduced accordingly, so that the refrigerant in the cooling component evaporates and absorbs heat, and then the refrigerant in the cooling component evaporates and takes away the heat of the pipe at the inlet of the pump body, thereby preventing the appearance of gas at the inlet of the pump body unit, avoiding the occurrence of cavitation, and extending the overall life of the pump body unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0026] Figure 1 A schematic diagram of the overall structure of an anti-cavitation refrigeration system provided by an embodiment of the present invention;

[0027] Figure 2 It is a schematic structural diagram of a cooling component according to an embodiment of the present invention.

[0028] Illustrations: 1. Condenser; 2. Evaporator; 3. Liquid storage device; 4. Pump unit; 5. Cooling component; 51. First pipeline; 511. First pipeline inlet; 512. First pipeline outlet; 513. Guide part; 52. Second pipeline; 521. Second pipeline inlet; 522. Second pipeline outlet; 523. Flow channel part; 6. Solenoid valve; 71. First pressure sensor; 72. Second pressure sensor; 8. One-way valve; 9. Compressor. DETAILED DESCRIPTION

[0029] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0031] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0032] Please refer to Figure 1 to Figure 2 , Figure 1 The overall structural diagram of the anti-cavitation refrigeration system provided by the embodiment of the present invention is as follows: Figure 2 It is a schematic structural diagram of a cooling component according to an embodiment of the present invention.

[0033] The anti-cavitation refrigeration system provided in the embodiment of the present invention is mainly used in refrigeration scenarios. By improving its structure, the anti-cavitation refrigeration system can avoid cavitation when starting.

[0034] like Figure 1 As shown, this embodiment provides an anti-cavitation refrigeration system, including a condenser 1, an evaporator 2, a liquid storage device 3 and a pump body unit 4. The condenser 1 includes a condensation pipe and a fan for cooling the condensation pipe. The condensation pipe is connected to the liquid storage device 3. The liquid storage device 3 stores refrigerant. The pump body unit 4 is used to transport the refrigerant in the liquid storage device 3 to the evaporator 2.

[0035] The condensation outlet of the condensation pipe is connected to the liquid storage inlet of the liquid storage device 3, the liquid storage outlet of the liquid storage device 3 is connected to the pump body inlet of the pump body unit 4, the pump body outlet of the pump body unit 4 is connected to the evaporation inlet of the evaporator 2; the evaporation outlet of the evaporator 2 is connected to the condensation inlet of the condensation pipe.

[0036] The pump body inlet of the pump body unit 4 is also connected to a cooling component 5, which is used to cool the refrigerant flowing to the pump body inlet. The refrigerant flows in the cooling component 5, and the cooling component 5 is connected to the condensation pipe.

[0037] Specifically, when the anti-cavitation refrigeration system is just started, the fan of the condenser 1 is started first, and the pressure of the internal pipe of the condenser 1 drops under the action of the fan, and the cooling component 5 is connected to the condenser 1, and the pressure in the pipe connected to the condenser 1 in the cooling component 5 is also reduced accordingly, and the evaporation temperature of the refrigerant is also reduced accordingly. The pressure difference causes the liquid refrigerant introduced from the liquid storage outlet of the liquid storage device 3 in the cooling component 5 to evaporate and absorb heat and then re-enter the liquid storage inlet of the liquid storage device 3. Then, when the refrigerant in the pipe connected to the condenser 1 by the cooling component 5 evaporates, it takes away the heat of the pipe connected to the pump body inlet of the pump body unit 4, thereby preventing the appearance of gas at the inlet of the pump body unit 4, avoiding the occurrence of cavitation, and extending the overall life of the pump body unit. It should be noted that the cooling component 5 of the present invention does not need to use other cooling means or control means to cool down, and has the advantages of fast response and stable cooling.

[0038] Furthermore, if Figure 2 As shown, the cooling component 5 includes a first pipe 51 and a second pipe 52 .

[0039] The first pipe inlet 511 of the first pipe 51 is connected to the liquid storage outlet of the liquid storage device 3 , and the first pipe outlet 512 of the first pipe 51 is connected to the pump body inlet of the pump body unit 4 .

[0040] The second pipe inlet 521 of the second pipe 52 is connected to the liquid storage outlet of the liquid storage device 3 , the second pipe outlet 522 of the second pipe 52 is connected to the condenser 1 , and the second pipe 52 can exchange heat with the first pipe 51 .

[0041] Specifically, when the anti-cavitation refrigeration system is just started, the fan of the condenser 1 is started first, and the internal pipeline pressure of the condenser 1 decreases, so the pressure of the second pipeline 52 is also reduced accordingly, and then the boiling point of the refrigerant in the second pipeline 52 is reduced and then evaporated into gas. The refrigerant absorbs heat when evaporating. Since the second pipeline 52 can exchange heat with the first pipeline 51, the temperature in the first pipeline 51 decreases, so that the refrigerant gas at the inlet of the pump unit 4 is completely cooled and turned into refrigerant liquid. And the second pipeline inlet 521 of the second pipeline 52 is connected to the liquid storage device 3 to ensure that there is enough refrigerant inside to evaporate into gas to take away the heat in the first pipeline 51, so as to ensure that no cavitation occurs when the anti-cavitation refrigeration system is started.

[0042] It should be added that the cooling component 5 can also include other forms. For example, the second pipe inlet 521 of the second pipe 52 is not connected to the liquid storage outlet of the liquid storage device 3, that is, the second pipe inlet 521 of the second pipe 52 is sealed. Each time the anti-cavitation refrigeration system is shut down, the refrigerant will be retained in the second pipe 52. When the anti-cavitation refrigeration system is started next time, when the fan of the condenser 1 is started, the pipe pressure of the condenser 1 drops, causing the refrigerant in the second pipe 52 to evaporate into gas, which absorbs heat in the first pipe 51 during evaporation, causing the first pipe 51 to be overcooled, thereby ensuring that the refrigerant inside it does not evaporate.

[0043] In a specific embodiment, the second pipe outlet 522 of the second pipe 52 is in communication with the condensation outlet of the condenser 1 .

[0044] Furthermore, the second pipe 52 forms a flow channel portion 523 between the second pipe inlet 521 and the second pipe outlet 522 , and the first pipe 51 passes through the flow channel portion 523 .

[0045] In a specific embodiment, the first pipe 51 is formed with a guide portion 513 at the first pipe inlet 511 and the first pipe outlet 512 respectively.

[0046] The cross-sectional area of ​​the first end of the guide portion 513 close to the first pipe 51 is larger than the cross-sectional area of ​​the second end of the guide portion 513 away from the first pipe 51. When the refrigerant enters the first pipe 51, the flow rate can be reduced to ensure sufficient heat exchange with the first pipe 51 and the second pipe 52, and the flow rate can be accelerated when flowing out of the first pipe 51, thereby promoting the refrigeration efficiency of the anti-cavitation refrigeration system. It should be noted that the cooling component 5 can also adopt other forms. For example, the cross-sectional area of ​​the first end of the guide portion 513 close to the first pipe 51 is equal to the cross-sectional area of ​​the second end of the guide portion 513 away from the first pipe 51, thereby improving the stability of the refrigerant when flowing in the cooling component 5. In short, the core of the cooling component 5 is that the second pipe 52 can exchange heat with the first pipe 51, and the specific structure is not limited.

[0047] Furthermore, a solenoid valve 6 is provided between the second pipe inlet 521 of the second pipe 52 and the liquid storage device 3 , and the solenoid valve 6 is used to connect the second pipe 52 and the liquid storage device 3 when the fan of the condenser 1 is started.

[0048] Specifically, the anti-cavitation refrigeration system further includes a main control unit. A first pressure sensor 71 is provided at the pump inlet of the pump unit 4 , and a second pressure sensor 72 is provided at the pump outlet of the pump unit 4 .

[0049] The main control unit is electrically connected to the first pressure sensor 71, the second pressure sensor 72 and the solenoid valve 6 respectively, and is used to close the solenoid valve 6 when the pressure difference between the first pressure sensor 71 and the second pressure sensor 72 is greater than a preset pressure threshold for a duration exceeding a preset time value.

[0050] Exemplarily, when the anti-cavitation refrigeration system detects the need to start the fluorine pump, the fan of the condenser 1 is started and the solenoid valve 6 is opened. The pressure is detected by the first pressure sensor 71 and the second pressure sensor 72. When the pressure difference is greater than or equal to the minimum head of the fluorine pump (0.5-1bar) for a certain period of time (which can be set to a value between 30S-60S), the solenoid valve 6 is closed. It should be noted that when the anti-cavitation refrigeration system is started, if there is almost no pressure difference before and after the fluorine pump, it indicates that there is a risk of cavitation. Only when the pressure difference is greater than the threshold value can it be said that the fluorine pump has established a head to ensure that no cavitation occurs. The preset time value can ensure the safe startup of the fluorine pump and avoid the consequence of premature closure of the solenoid valve 6 due to the accidental pressure difference being greater than the pressure threshold.

[0051] like Figure 1 As mentioned above, the pump unit 4 is connected in parallel with a one-way valve 8 .

[0052] Furthermore, a compressor 9 is connected between the evaporation outlet of the evaporator 2 and the condensation inlet of the condenser 1 , and a one-way valve 8 is connected in parallel to the compressor 9 .

[0053] Specifically, the pump unit 4 is a fluorine pump. It should be understood that the pump unit can also be a refrigerant pump.

[0054] In summary, the anti-cavitation refrigeration system provided by the present invention can prevent the appearance of gas at the inlet of the pump unit 4, avoid the occurrence of cavitation, extend the overall life of the pump unit, and also has the characteristics of fast response, stable cooling, and high stability.

[0055] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anti-cavitation refrigeration system, characterized in that: The invention comprises a condenser (1), an evaporator (2), a liquid storage device (3) and a pump unit (4); the condenser (1) comprises a condensation pipeline and a fan for cooling the condensation pipeline; the condensation pipeline is connected to the liquid storage device (3); a refrigerant is stored in the liquid storage device (3); and the pump unit (4) is used to transport the refrigerant in the liquid storage device (3) to the evaporator (2); The condensation outlet of the condensation pipeline is communicated with the liquid storage inlet of the liquid storage device (3), the liquid storage outlet of the liquid storage device (3) is communicated with the pump body inlet of the pump body unit (4), the pump body outlet of the pump body unit (4) is communicated with the evaporation inlet of the evaporator (2); the evaporation outlet of the evaporator (2) is communicated with the condensation inlet of the condensation pipeline; The pump body inlet of the pump body unit (4) is also connected to a cooling component (5), and the cooling component (5) is used to cool the refrigerant flowing to the pump body inlet. The refrigerant flows in the cooling component (5), and the cooling component (5) is connected to the condensation pipe.

2. The anti-cavitation refrigeration system according to claim 1, characterized in that: The cooling component (5) comprises a first pipeline (51) and a second pipeline (52); The first pipeline inlet (511) of the first pipeline (51) is connected to the liquid storage outlet of the liquid storage device (3), and the first pipeline outlet (512) of the first pipeline (51) is connected to the pump body inlet of the pump body unit (4); The second pipe inlet (521) of the second pipe (52) is connected to the liquid storage outlet of the liquid storage device (3), the second pipe outlet (522) of the second pipe (52) is connected to the condensation pipe, and the second pipe (52) can exchange heat with the first pipe (51).

3. The anti-cavitation refrigeration system according to claim 2, characterized in that: The second pipe outlet (522) of the second pipe (52) is in communication with the condensation outlet of the condensation pipe.

4. The anti-cavitation refrigeration system according to claim 2, characterized in that: The second pipe (52) forms a flow channel portion (523) between the second pipe inlet (521) and the second pipe outlet (522), and the first pipe (51) passes through the flow channel portion (523).

5. The anti-cavitation refrigeration system according to claim 4, characterized in that: The first pipeline (51) is formed with flow guide portions (513) at the first pipeline inlet (511) and the first pipeline outlet (512), respectively; The cross-sectional area of ​​a first end portion of the flow guide portion (513) close to the first pipe (51) is larger than the cross-sectional area of ​​a second end portion of the flow guide portion (513) away from the first pipe (51).

6. The anti-cavitation refrigeration system according to claim 2, characterized in that: A solenoid valve (6) is provided between the second pipe inlet (521) of the second pipe (52) and the liquid storage device (3), and the solenoid valve (6) is used to connect the second pipe (52) and the liquid storage device (3) when the fan is started.

7. The anti-cavitation refrigeration system according to claim 6, characterized in that: It also comprises a main control unit, wherein a first pressure sensor (71) is arranged at a pump body inlet of the pump body unit (4), and a second pressure sensor (72) is arranged at a pump body outlet of the pump body unit (4); The main control unit is electrically connected to the first pressure sensor (71), the second pressure sensor (72) and the solenoid valve (6) respectively, and is used to close the solenoid valve (6) when the pressure difference between the first pressure sensor (71) and the second pressure sensor (72) is greater than a preset pressure threshold for a duration exceeding a preset time value.

8. The anti-cavitation refrigeration system according to claim 1, characterized in that: The pump body unit (4) is connected in parallel with a one-way valve (8).

9. The anti-cavitation refrigeration system according to claim 1, characterized in that: A compressor (9) is connected between the evaporation outlet of the evaporator (2) and the condensation inlet of the condensation pipe, and the compressor (9) is connected in parallel with a one-way valve (8).

10. The anti-cavitation refrigeration system according to any one of claims 1 to 9, characterized in that: The pump body unit (4) is a fluorine pump.

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