Refrigerant pump and refrigerating system

Abstract

The invention provides a refrigerant pump and a refrigerating system. The refrigerant pump comprises a pump body which comprises a liquid suction port; the first liquid storage device comprises a cylinder body, a liquid return pipe, a liquid inlet pipe, a liquid level pipe and a degassing pipe; the liquid return pipe and the liquid inlet pipe are arranged at the two axial ends of the barrel respectively. The liquid return pipe is communicated with the liquid suction port; the first end of the liquid level pipe is arranged on the side wall of the barrel; and the degassing pipe is communicated with the liquid inlet pipe and the liquid level pipe. The refrigerant pumps are provided with the liquid level pipes, the liquid level pipes in the refrigerant pumps connected in parallel communicate with one another, when the liquid level of the refrigerant in the first liquid storage device is not uniform, the refrigerant with the high liquid level can automatically flow to the refrigerant with the low liquid level, and then liquid uniformization is achieved; and by arranging the degassing pipe, the refrigerant entering the first liquid storage device through the liquid level pipe can be subjected to degassing treatment, and the situation that cavitation is generated in the pump body, and the pump body is damaged is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration, and in particular to a refrigerant pump and a refrigeration system. Background Art

[0002] With the rapid development of the communications industry, the heat generated by a single cabinet in a data center is increasing, and the heat generated by some cabinets can exceed 20kW. In order to ensure that the cabinets can operate normally without being affected by temperature, row-to-row air conditioners are currently mainly used to dissipate heat from the cabinets. Row-to-row air conditioners generally have their own compressors and evaporators, which correspond to the outdoor units one by one. The outdoor units are composed of refrigerant pumps and condensers.

[0003] In winter and transitional seasons (spring and autumn), conventional compressor refrigeration has low condensing temperature due to low outdoor ambient temperature, which can easily cause reliability problems such as refrigerant accumulation and poor lubrication in the compressor housing. Therefore, in winter and transitional seasons, refrigerant pumps are usually used to utilize outdoor natural cold sources and share one outdoor unit to supply liquid refrigeration to the indoor units of each inter-row air conditioner. When one refrigerant pump cannot meet the flow requirements, two or more refrigerant pumps with the same characteristics can be used in parallel. For some large pumps that require a backup pump, two pumps (each with a flow rate of 50%) can also be selected for parallel operation, with one pump as a backup, that is, two-on and one-backup.

[0004] However, when conventional refrigerant pumps are running at high speed, the liquid flow in the pipeline is easily unevenly distributed. The saturated pressure of the liquid refrigerant at the suction port of the refrigerant pump is low, and the suction pressure is prone to sudden drop and cavitation occurs. The liquid refrigerant flashes into gas, and the gaseous refrigerant blocks the passage of the refrigerant pump suction port, causing unstable flow and making it difficult for the refrigeration system to operate stably. When multiple refrigerant pumps are connected in parallel, uneven refrigerant distribution will affect the refrigeration efficiency of the refrigeration system and may also damage the refrigerant pump. Summary of the invention

[0005] In view of the problems in the prior art, an object of the present invention is to provide a refrigerant pump and a refrigeration system to improve the stability of the operation of the refrigerant pump.

[0006] An embodiment of the present invention provides a refrigerant pump, comprising:

[0007] A pump body, including a suction port;

[0008] The first liquid reservoir comprises a cylinder, a liquid return pipe, a liquid inlet pipe, a liquid level pipe and a degassing pipe; the liquid return pipe and the liquid inlet pipe are respectively arranged at the axial ends of the cylinder; the liquid return pipe is connected with the liquid suction port; the liquid level pipe is arranged on the side wall of the cylinder; the degassing pipe is connected with the liquid inlet pipe and the liquid level pipe.

[0009] In some embodiments, the first end of the degassing pipe is disposed on the side wall of the liquid inlet pipe, and the second end of the degassing pipe is disposed on the side wall of the liquid level pipe.

[0010] In some embodiments, the maximum diameter of the liquid level tube is D, and the diameter of the degassing tube is d, satisfying: 1.4<d / D<0.32.

[0011] In some embodiments, the distance between the liquid level tube and the liquid suction port is H, and H is greater than 30 mm.

[0012] In some embodiments, the second ends of the liquid level pipes of the multiple refrigerant pumps connected in parallel are connected to each other through a pipeline, and the pipeline includes a first branch pipe and a second branch pipe, the first end of the first branch pipe is connected to the second end of the liquid level pipe, and the second ends of multiple first branch pipes are connected to the second branch pipe.

[0013] In some embodiments, the second ends of the plurality of first branch pipes are located on the same horizontal plane.

[0014] In some embodiments, the refrigerant pump also includes a shell and a motor, and the pump body and the motor are located inside the shell; the pump body includes a cylinder, an upper cylinder head, a lower cylinder head, a crankshaft and a rolling rotor; the upper cylinder head and the lower cylinder head are respectively located at the axial ends of the cylinder; the crankshaft passes through the two ends of the cylinder; the rolling rotor is sleeved on the eccentric part of the crankshaft and is located inside the cylinder; the motor includes a stator and a rotor arranged coaxially with the stator, and the rotor is connected to the crankshaft.

[0015] In some embodiments, the cylinder includes a cylinder cavity, and the cylinder is radially provided with a blade groove connected to the cylinder cavity and a spring hole connected to the blade groove, a blade is provided in the blade groove, and a spring is installed in the spring hole, and two ends of the blade are respectively abutted against the rolling rotor and the spring.

[0016] An embodiment of the present invention also provides a refrigeration system, comprising at least two refrigerant pumps as described above, each of the refrigerant pumps being connected in parallel; the liquid level pipes of each of the refrigerant pumps are connected to each other, the liquid inlet pipes of each of the refrigerant pumps are connected in parallel, and the discharge ends of each of the refrigerant pumps are connected in parallel.

[0017] In some embodiments, the refrigeration system also includes a first heat exchanger, a throttling device, a second heat exchanger and a second liquid reservoir, the first end of the first heat exchanger is connected to the discharge end of each of the refrigerant pumps, the second end of the first heat exchanger is connected to the first end of the throttling device, the second end of the throttling device is connected to the first end of the second heat exchanger, the second end of the second heat exchanger is connected to the first end of the second liquid reservoir; the second end of the second liquid reservoir is connected to the liquid inlet pipe of each of the refrigerant pumps.

[0018] In some embodiments, the first heat exchanger is an evaporator located indoors; the second heat exchanger is a condenser located outdoors.

[0019] The refrigerant pump and refrigeration system provided by the present invention have the following advantages:

[0020] The refrigerant pump in the present invention is provided with a liquid level tube. In the refrigeration system, the liquid level tubes in the refrigerant pumps connected in parallel are connected to each other. When the liquid level of the refrigerant in each first liquid reservoir is uneven, the high liquid level refrigerant will automatically flow to the low liquid level refrigerant, thereby making the refrigerant level in each first liquid reservoir uniform. The setting of the degassing pipe can degas the refrigerant entering the first liquid reservoir through the liquid level tube, prevent cavitation from occurring inside the pump body and damage to the pump body, and can also stabilize the refrigerant flow rate sucked into the pump body, so that the system can operate stably and improve the system operation stability and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0022] Figure 1 is a schematic diagram of a refrigerant pump provided in one embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Enlarged view of the location indicated by the circle;

[0024] Figure 3 yes Figure 1 A schematic diagram of a cylinder of a refrigerant pump;

[0025] Figure 4 is a schematic diagram of a refrigerant pump provided in another embodiment of the present invention;

[0026] Figure 5 yes Figure 4 A schematic diagram of a cylinder of a refrigerant pump is shown;

[0027] Figure 6 is a schematic diagram of a refrigerant pump provided in yet another embodiment of the present invention;

[0028] Figure 7 Schematic diagram of a refrigeration system provided in one embodiment of the present invention.

[0029] Reference numerals:

[0030] 10 pump body 24 liquid level pipe

[0031] 11 cylinder 25 degassing pipe

[0032] 111 blade slot 30 housing

[0033] 112 spring hole 31 discharge end

[0034] 12 upper cylinder head 40 motor

[0035] 13 lower cylinder head 41 stator

[0036] 14 crankshaft 42 rotor

[0037] 15 rolling rotor 50 first heat exchanger

[0038] 16 blades 60 second heat exchanger

[0039] 20 first liquid reservoir 70 second liquid reservoir

[0040] 21 cylinder 80 throttling device

[0041] 22 liquid return pipe 91 first branch pipe

[0042] 23 liquid inlet pipe 92 second branch pipe DETAILED DESCRIPTION

[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0044] In the representations of the present application, the representations with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the represented specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples represented in the present application and the features of the different embodiments or examples, unless they contradict each other.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In order to solve the problems in the prior art, an embodiment of the present invention provides a refrigerant pump. Figure 1 FIG. 1 is a schematic diagram of a refrigerant pump provided by an embodiment of the present invention. Figure 1 As shown, the refrigerant pump includes:

[0047] The pump body 10 includes a liquid suction port;

[0048] The first liquid reservoir 20 includes a cylinder 21, a liquid return pipe 22, a liquid inlet pipe 23, a liquid level pipe 24 and a degassing pipe 25; the liquid return pipe 22 and the liquid inlet pipe 23 are respectively arranged at the axial ends of the cylinder 21, and the liquid return pipe 22 is connected to the liquid suction port; the first end of the liquid level pipe 24 is arranged on the side wall of the cylinder 21; the degassing pipe 25 connects the liquid inlet pipe 23 and the liquid level pipe 24.

[0049] When multiple refrigerant pumps are connected in parallel, the liquid level tubes 24 of each refrigerant pump are interconnected, and the interconnected liquid level tubes 24 act as a U-shaped tube. When the liquid level of the liquid refrigerant in the first liquid reservoir 20 of multiple refrigerant pumps is uneven, the liquid refrigerant in the one with a high liquid level will automatically flow to the one with a low liquid level, achieving a liquid equalization effect, ensuring that the liquid refrigerant level in the first liquid reservoir of each refrigerant pump connected in parallel is uniform, and each refrigerant pump can operate stably.

[0050] Furthermore, the degassing pipe 25 is connected to the liquid inlet pipe 23 and the liquid level pipe 24. When the refrigerant is a gas-liquid mixture, the gaseous refrigerant is located above the liquid refrigerant. When the refrigerant passes through the liquid level pipe 24, the gaseous refrigerant is discharged through the degassing pipe 25, and the liquid refrigerant is sucked into the pump body 10 to participate in the working cycle. The discharge of the gaseous refrigerant through the degassing pipe 25 can prevent the gaseous refrigerant from entering the pump body 10 to generate cavitation, thereby improving the working stability of the pump body 10; and removing the gaseous refrigerant through the degassing pipe 25 can also stabilize the refrigerant flow rate sucked into the pump body 10, stabilize the operation of the refrigerant pump, and improve the working stability and working efficiency of the refrigerant pump.

[0051] In the embodiment of the present invention, the degassing pipe 25 is L-shaped, one end of which is connected to the liquid inlet pipe 23 , the first end of the degassing pipe 25 is arranged on the side wall of the liquid inlet pipe 23 , and the second end of the degassing pipe 25 is arranged on the side wall of the liquid level pipe 24 .

[0052] For further information, see Figure 2, the maximum diameter of the liquid level pipe 24 is D, and the diameter of the degassing pipe 25 is d, which satisfies: 1.4<d / D<0.32. For example, d / D can be 0.4, 0.6, 0.8, 1.0, 1.2.

[0053] For further information, see Figure 1 The distance between the center of the liquid level tube 24 and the liquid suction port is H, and H is greater than 30 mm. Exemplarily, H can be 40 mm, 45 mm, 50 mm, 55 mm and 60 mm.

[0054] like Figure 7 As shown, the second ends of the liquid level pipes 24 of multiple refrigerant pumps connected in parallel are connected to each other through a pipeline, and the pipeline includes a first branch pipe 91 and a second branch pipe 92. The first end of the first branch pipe 91 is connected to the second end of the liquid level pipe 24, and the second ends of multiple first branch pipes 91 are connected to the second branch pipe 92.

[0055] Furthermore, the second ends of the plurality of first branch pipes 91 are located on the same horizontal plane, so that when the liquid refrigerant in the first liquid storage tanks 20 of the plurality of refrigerant pumps has uneven liquid levels, the liquid refrigerant in the first liquid storage tanks 20 with higher liquid levels will automatically flow to the one with lower liquid levels, thereby achieving a uniform liquid effect.

[0056] See also Figure 1 and Figure 3 The refrigerant pump further comprises a housing 30 and a motor 40, wherein the pump body 10 and the motor 40 are located inside the housing 30; the pump body 10 comprises a cylinder 11, an upper cylinder head 12, a lower cylinder head 13, a crankshaft 14 and a rolling rotor 15; the upper cylinder head 12 and the lower cylinder head 13 are respectively located at the two ends of the cylinder 11, the crankshaft 14 is passed through the two ends of the cylinder 11, and the rolling rotor 15 is sleeved on the eccentric part of the crankshaft 14 and is located inside the cylinder 11. The motor 40 comprises a stator 41 and a rotor 42 which is coaxially arranged with the stator 41 and is located inside the stator 41, and the rotor 42 is connected to the crankshaft 14. When current is applied to the stator 41, the stator 41 generates a rotating magnetic field, which drives the rotor 42 to rotate, and the rotor 42 then drives the crankshaft 14 to rotate.

[0057] like Figure 3 As shown, the cylinder 11 includes a cylinder cavity, and a blade groove 111 connected to the cylinder cavity and a spring hole 112 connected to the blade groove 111 are provided in the radial direction of the cylinder 11. A blade 16 is provided in the blade groove 111, and a spring is installed in the spring hole 112. The two ends of the blade 16 are respectively abutted against the rolling rotor 15 and the spring.

[0058] The pump body 10 in the embodiment of the present invention is a double-cylinder single-suction structure, that is, the pump body 10 includes two cylinders 11 and a liquid suction port, and the liquid suction port is arranged on the middle plate between the two cylinders 11.

[0059] like Figure 4As shown, in other embodiments, the pump body 10 can also be configured as a double-cylinder double-suction structure, that is, each of the two cylinders 11 is provided with a liquid suction port. The specific structure of the cylinder 11 can be referred to Figure 5 as shown in .

[0060] like Figure 6 As shown, in other embodiments, the pump body 10 can also be set as a single-cylinder single-suction structure, that is, a liquid suction port is provided on a cylinder 11. The specific structure of the cylinder 11 can be referred to Figure 5 as shown in .

[0061] The working principle of the refrigerant pump is introduced below.

[0062] When the motor 40 is running, the rotor 42 drives the crankshaft 14 to rotate, and the crankshaft 14 drives the rolling rotor 15 to roll along the inner wall of the cylinder. The outer diameter of the rolling rotor 15 and the inner diameter of the cylinder 11 form a crescent-shaped working chamber. The blade 16 is in close contact with the rolling rotor 15 at its end by the force of the spring, dividing the crescent-shaped working chamber into two parts: the suction chamber and the compression discharge chamber; the refrigerant liquid is sucked into an expanded cavity from the return pipe 22, and then as the volume shrinks, the refrigerant is pushed and obtains a certain head and is discharged from the pump body 10, that is, from the discharge end 31 of the shell 30 into the output pipe of the refrigeration system. The head refers to the effective pressure head of the pump, that is, the net increase in energy obtained by the unit mass of fluid through the pump.

[0063] An embodiment of the present invention also provides a refrigeration system, comprising at least two refrigerant pumps as described above, each refrigerant pump is connected in parallel; the liquid level pipes of each refrigerant pump are connected to each other, the liquid inlet pipes of each refrigerant pump are connected in parallel, and the discharge ends of each refrigerant pump are connected in parallel. Figure 7 FIG. 1 is a schematic diagram of a refrigeration system provided by an embodiment of the present invention. Figure 7 As shown, an embodiment of the present invention provides a refrigeration system, including three refrigerant pumps, which are connected in parallel; the liquid level pipes 24 of each refrigerant pump are connected to each other, the liquid inlet pipes of each refrigerant pump are connected in parallel, and the discharge ends of each refrigerant pump are connected in parallel. The refrigeration system can achieve all the technical effects of the above-mentioned refrigerant pumps, which will not be repeated here.

[0064] The refrigeration system also includes a first heat exchanger 50, a throttling device 80, a second heat exchanger 60 and a second liquid reservoir 70. The first end of the first heat exchanger 50 is connected to the discharge end 31 of each refrigerant pump, the second end of the first heat exchanger 50 is connected to the first end of the throttling device 80, the second end of the throttling device 80 is connected to the first end of the second heat exchanger 60, the second end of the second heat exchanger 60 is connected to the first end of the second liquid reservoir 70; the second end of the second liquid reservoir 70 is connected to the liquid inlet pipe 23 of each refrigerant pump.

[0065] The first heat exchanger 50 is an evaporator located indoors; the second heat exchanger 60 is a condenser located outdoors.

[0066] The working principle of the refrigeration system is introduced below.

[0067] After the liquid refrigerant absorbs heat and evaporates in the first heat exchanger 50 (evaporator) located indoors, it enters the second heat exchanger 60 (condenser) outdoors to be condensed into a supercooled liquid refrigerant, enters the second liquid reservoir 70 for oil-liquid separation, and then returns to the first liquid reservoir 20. The refrigerant is pumped to the evaporator again by the refrigerant pump to complete a working cycle. The head and flow rate of the refrigerant pumps increase after they are connected in parallel. In actual applications, those skilled in the art can select the number of parallel refrigerant pumps based on the installation distance, head, and cooling load requirements of the indoor and outdoor unit systems, and no specific restrictions are made here.

[0068] In summary, the refrigerant pump and refrigeration system provided by the present invention have the following advantages:

[0069] The refrigerant pump in the present invention is provided with a liquid level tube. In the refrigeration system, the liquid level tubes in the refrigerant pumps connected in parallel are connected to each other. When the liquid level of the refrigerant in each first liquid reservoir is uneven, the refrigerant with a high liquid level will automatically flow to the low liquid level, thereby making the internal refrigerant level in each first liquid reservoir uniform. The degassing pipe can degas the gaseous refrigerant passing through the liquid level tube, thereby preventing the gaseous refrigerant from being sucked into the pump body, preventing cavitation from occurring inside the pump body and damaging the pump body, and can also stabilize the refrigerant flow rate sucked into the pump body, so that the system can operate stably and improve the system operation stability and efficiency.

[0070] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A refrigerant pump, characterized in that: include: A pump body, including a suction port; The first liquid reservoir comprises a cylinder, a liquid return pipe, a liquid inlet pipe, a liquid level pipe and a degassing pipe; the liquid return pipe and the liquid inlet pipe are respectively arranged at the axial ends of the cylinder; the liquid return pipe is connected with the liquid suction port; the first end of the liquid level pipe is arranged on the side wall of the cylinder; the degassing pipe is connected with the liquid inlet pipe and the liquid level pipe.

2. The refrigerant pump according to claim 1, characterized in that: The first end of the degassing pipe is arranged on the side wall of the liquid inlet pipe, and the second end of the degassing pipe is arranged on the side wall of the liquid level pipe.

3. The refrigerant pump according to claim 1, characterized in that: The maximum diameter of the liquid level pipe is D, and the diameter of the degassing pipe is d, which satisfies: 1.4<d / D<0.

32.

4. The refrigerant pump according to claim 1, characterized in that: The distance between the center of the liquid level tube and the liquid suction port is H, and H is greater than 30 mm.

5. The refrigerant pump according to claim 1, characterized in that: The second ends of the liquid level pipes of the multiple refrigerant pumps connected in parallel are connected to each other through a pipeline, and the pipeline includes a first branch pipe and a second branch pipe, the first end of the first branch pipe is connected to the second end of the liquid level pipe, and the second ends of the multiple first branch pipes are connected to the second branch pipe.

6. The refrigerant pump according to claim 5, characterized in that: The second ends of the plurality of first branch pipes are located on the same horizontal plane.

7. The refrigerant pump according to any one of claims 1 to 6, characterized in that: The refrigerant pump also includes a shell and a motor, and the pump body and the motor are located inside the shell; the pump body includes a cylinder, an upper cylinder head, a lower cylinder head, a crankshaft and a rolling rotor; the upper cylinder head and the lower cylinder head are respectively located at the axial ends of the cylinder; the crankshaft passes through the two ends of the cylinder; the rolling rotor is sleeved on the eccentric part of the crankshaft and is located inside the cylinder; the motor includes a stator and a rotor arranged coaxially with the stator, and the rotor is connected to the crankshaft.

8. A refrigeration system, characterized in that: It comprises at least two refrigerant pumps as claimed in claim 7, each of which is connected in parallel; the liquid level pipes of each refrigerant pump are connected to each other, the liquid inlet pipes of each refrigerant pump are connected in parallel, and the discharge ends of each refrigerant pump are connected in parallel.

9. The refrigeration system according to claim 8, characterized in that: The refrigeration system also includes a first heat exchanger, a throttling device, a second heat exchanger and a second liquid reservoir. The first end of the first heat exchanger is connected to the discharge end of each refrigerant pump, the second end of the first heat exchanger is connected to the first end of the throttling device, the second end of the throttling device is connected to the first end of the second heat exchanger, the second end of the second heat exchanger is connected to the first end of the second liquid reservoir; the second end of the second liquid reservoir is connected to the liquid inlet pipe of each refrigerant pump.

10. The refrigeration system according to claim 9, characterized in that: The first heat exchanger is an evaporator located indoors; the second heat exchanger is a condenser located outdoors.

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