Multi-connected heat pipe air conditioning system

Abstract

The utility model discloses a kind of multi-connection heat pipe air conditioning systems, comprising: primary side refrigeration pipeline, including the compressor unit, condenser connected in turn, throttling device and heat exchanger;Secondary side refrigeration pipeline is connected in indoor terminal, including the first pipeline and the second pipeline in parallel arrangement, first pipeline and heat exchanger are connected in series to carry out heat exchange, the second pipeline is connected in series with condenser, the outlet end of first pipeline and the outlet end of second pipeline meet, and liquid accumulator and refrigerant pump unit are sequentially connected;Supercooling pipeline, the inlet end of supercooling pipeline is connected to the downstream of throttling device, and outlet end is connected to the suction side of compressor unit;The middle section of supercooling pipeline is arranged in the inside of liquid accumulator, using part low-temperature refrigerant in primary side refrigeration pipeline to carry out active heat exchange to liquid accumulator in secondary side refrigeration pipeline, reduce the refrigerant pressure in liquid accumulator under extreme hot weather such as summer;Overcome the problem of slow start caused by the pressure of traditional system is too high due to liquid accumulator.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, specifically a multi-split heat pipe air conditioning system. Background Technology

[0002] Multi-split heat pipe air conditioning systems are widely used in temperature control in precision environments such as computer rooms due to their high efficiency in heat exchange and flexible deployment. Traditional multi-split heat pipe air conditioning systems typically include primary-side and secondary-side refrigeration piping. The primary and secondary sides exchange heat through a main heat exchanger. The primary-side refrigeration piping consists of a compressor, condenser, throttling device, and heat exchanger, forming a complete refrigeration cycle. The secondary-side refrigeration piping connects to the indoor terminal equipment, drives the circulation through a refrigerant pump, and removes heat from the room.

[0003] In traditional systems, a liquid receiver is installed on the secondary side circuit to store and buffer the refrigerant. However, under conditions of high ambient temperature, such as in summer, the temperature and pressure of the refrigerant in the liquid receiver will increase accordingly. When the unit needs to start up, the excessive back pressure will make it difficult for the refrigerant to circulate, resulting in excessively long start-up time or even start-up failure. This poses a potential operational risk for data centers that require uninterrupted and stable operation. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a multi-split heat pipe air conditioning system that cools the refrigerant in the receiver through a subcooling section design. The system includes: a primary-side refrigeration piping system comprising a compressor unit, a condenser, a throttling device, and a heat exchanger connected in sequence; a secondary-side refrigeration piping system connected to the indoor terminal, comprising a first pipe and a second pipe connected in parallel, the first pipe connected in series with the heat exchanger for heat exchange, and the second pipe connected in series with the condenser, the outlet ends of the first and second pipes converging and connected in sequence to a receiver and a refrigerant pump unit; and a subcooling piping system, the inlet end of which is connected downstream of the throttling device, and the outlet end connected to the suction side of the compressor unit; wherein the middle section of the subcooling piping system is located inside the receiver for subcooling heat exchange.

[0005] Furthermore, the condenser includes at least two independently operable heat exchange modules.

[0006] Furthermore, control valves are respectively installed at the inlet ends of the first and second pipelines.

[0007] Furthermore, the compressor unit includes a gas-liquid separator, an oil separator, and at least two compressors connected in parallel.

[0008] Furthermore, the refrigerant pump unit includes at least two refrigerant pumps connected in parallel, and each refrigerant pump is equipped with a check valve at its outlet.

[0009] Furthermore, the heat exchanger is a plate heat exchanger.

[0010] Furthermore, the middle section of the subcooling pipeline has a spiral coil structure.

[0011] Furthermore, the throttling device is an electronic expansion valve.

[0012] Furthermore, the subcooling pipeline is a capillary tube.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. By connecting a subcooling line in parallel to the primary cooling line, and using part of the low-temperature refrigerant in the primary cooling line to exchange heat with the liquid receiver in the secondary cooling line, the refrigerant pressure in the liquid receiver can be effectively reduced under extreme hot weather conditions such as summer. By overcoming the problem of slow start-up caused by excessive liquid receiver pressure in traditional systems, the unit can be started up quickly, thus ensuring the continuous and stable operation of critical environments such as the computer room.

[0014] 2. Through the parallel connection of the first and second pipelines and control valves, different operating modes can be adopted according to the external temperature. This system can switch between multiple operating modes such as compressor mode, hybrid mode, and natural cooling source mode. In the high temperatures of summer, it operates in compressor mode, using the compressor for mechanical cooling. In the low temperatures of winter, it can be completely switched to natural cooling source mode, shutting down the high-energy-consuming compressor and using only outdoor cold air for cooling, significantly saving energy. In the transitional seasons, it can operate in hybrid mode, combining compressor cooling and natural cooling to achieve the best balance between performance and energy efficiency. The flexible operating strategy enables the system to adapt to environmental changes in different seasons, significantly improving the overall operating efficiency throughout the year and meeting the stringent requirements for low-carbon and energy-saving in places such as data centers. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a structural schematic diagram of one specific embodiment of the present utility model.

[0017] Figure 3 This is a structural schematic diagram of one specific embodiment of the present utility model.

[0018] The diagram shows: 1. Compressor unit; 101. Gas-liquid separator; 102. Oil separator; 103. Compressor; 2. Condenser; 3. Heat exchanger; 4. First pipeline; 5. Second pipeline; 6. Liquid receiver; 7. Refrigerant pump unit; 8. Subcooling pipeline. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, a specific embodiment of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] This embodiment discloses a multi-split heat pipe air conditioning system, including: a primary side refrigeration pipeline, including a compressor unit 1, a condenser 2, a throttling device and a heat exchanger 3 connected in sequence; The secondary cooling pipeline is connected to the indoor end and includes a first pipeline 4 and a second pipeline 5 arranged in parallel. The first pipeline 4 is connected in series with the heat exchanger 3 for heat exchange, and the second pipeline 5 is connected in series with the condenser 2. The outlet end of the first pipeline 4 and the outlet end of the second pipeline 5 meet and are connected in sequence to a liquid receiver 6 and a refrigerant pump unit 7. Subcooling pipe 8, the inlet end of which is connected to the downstream of the throttling device, and the outlet end of which is connected to the suction side of the compressor unit 1; The middle section of the subcooling pipe 8 is located inside the liquid reservoir 6 for subcooling heat exchange.

[0021] Reference Figure 1 and Figure 2 The refrigerant circulation path of the primary side refrigeration pipeline provided in this embodiment is as follows: After the low-temperature and low-pressure gaseous refrigerant flows out of the heat exchanger 3, it enters the compressor unit 1 and is compressed into a high-temperature and high-pressure gas. The high-temperature and high-pressure gas enters the condenser 2 and is cooled and condensed into a liquid. The condensed liquid refrigerant passes through the dryer filter and the solenoid valve (since the dryer filter and the solenoid valve are existing technologies, they will not be described in detail here), and then is throttled and depressurized by the throttling device, becoming a low-temperature and low-pressure gas-liquid two-phase mixture. The secondary-side refrigeration piping provided in this embodiment forms a closed loop with the indoor terminals (such as server racks in libraries or computer rooms). The low-temperature liquid refrigerant pumped by the refrigerant pump unit 7 flows to the indoor terminals, absorbs indoor heat, and becomes gaseous or gas-liquid mixed state. The refrigerant carrying heat flows back from the indoor terminals and enters the heat exchanger 3, where it transfers the heat it carries to the refrigerant in the primary-side refrigeration piping and is cooled into a liquid state. It then flows into the liquid receiver 6, waiting to be pumped out again by the refrigerant pump unit 7 to complete the cycle. As a preferred embodiment, the secondary-side refrigeration piping of this utility model can be connected in parallel with multiple indoor terminals to cool multiple indoor terminals simultaneously.

[0022] A parallel subcooling pipe 6 is provided in the primary side refrigeration piping. Regarding the specific location of the subcooling pipe 6, the inlet end can be located on the pipe between the throttling device and the heat exchanger 5, and the outlet end of the subcooling pipe 6 can be located on the pipe between the heat exchanger and the compressor unit. The middle section of the cooling pipe 6 is located in the liquid receiver. During operation, a small amount of refrigerant will flow through the subcooling pipe 6, thereby cooling the refrigerant in the liquid receiver 3. In high-temperature environments such as summer, even if the unit is shut down for a long time and the initial pressure of the liquid receiver 3 is high, once the unit is started, the subcooling pipe will immediately actively reduce the pressure of the liquid receiver 3. This creates good working conditions for the refrigerant pump unit 4 on the secondary side, enabling it to quickly establish an effective refrigerant cycle, thereby greatly shortening the system start-up time, improving the system reliability and environmental adaptability, and is particularly suitable for places such as data centers with stringent requirements for operational stability.

[0023] As one embodiment of this utility model, the condenser 2 includes at least two independently operable heat exchange modules.

[0024] Figure 1 The condenser 2 shown includes two independently operable heat exchange modules, each of which includes two heat sinks. Figure 2 The diagram shows the operating path of one of the heat exchange modules when running independently. Figure 3 The diagram shows the working path of another heat exchange module running independently.

[0025] As one embodiment of this utility model, the inlet ends of the first pipeline 4 and the second pipeline 5 are respectively provided with control valves.

[0026] like Figure 1 As shown, the control valve controls the simultaneous opening of the first pipe 4 and the second pipe 5, which meets the cooling demand while saving energy. In this embodiment, the second pipe 5 can also work independently, such as... Figure 3 As shown, when the outside temperature is low, the second pipe 5 is used in conjunction with the condenser 2 for natural cooling.

[0027] As one embodiment of the present invention, the compressor unit 1 includes a gas-liquid separator 101, an oil separator 102, and at least two compressors 103 connected in parallel.

[0028] In this embodiment, the compressors 103 are arranged in parallel, which can maintain the normal operation of the entire system even if one of the compressors fails. A one-way valve is connected to the outlet end of each compressor, and a one-way valve is connected to the outlet end of the oil separator 102 to ensure the normal operation of the system.

[0029] As one embodiment of this utility model, the refrigerant pump unit 7 includes at least two refrigerant pumps arranged in parallel, and each refrigerant pump is provided with a one-way valve at its outlet end.

[0030] Similar to the above embodiments, this embodiment uses two refrigerant pumps connected in parallel, which ensures that the system can still operate normally even if one of the refrigerant pumps fails, and the parallel connection of the refrigerant pumps can greatly improve the overall operational stability of the system.

[0031] As one embodiment of this utility model, the heat exchanger 3 is a plate heat exchanger.

[0032] As one embodiment of this utility model, the middle section of the subcooling pipe 8 is a spiral coil structure.

[0033] The length of the subcooling pipe 8 can be increased as much as possible within the limited space inside the liquid reservoir 3, thereby improving the cooling effect.

[0034] As one embodiment of this utility model, the throttling device is an electronic expansion valve.

[0035] As one embodiment of this utility model, the subcooling pipe 8 is a capillary tube.

[0036] This utility model has at least the following working modes: In the first operating mode, when the outdoor temperature is high, such as in summer, the compressor and refrigerant pump work together. At this time, the second pipe 5 is closed, and the refrigerant flows through the first pipe 4, exchanging heat with the primary-side refrigeration pipes via the plate heat exchanger. Simultaneously, the compressor 103 and the refrigerant pump work to cool the indoor environment. The refrigerant flow path is shown in the reference diagram. Figure 2 .

[0037] The second working mode is as follows: Figure 1 As shown, when the outdoor environment is in the transitional season, the compressor 103 and the refrigerant pump work together. At this time, the second pipeline 5 is opened, and the refrigerant flowing out from the indoor terminal flows through the first pipeline 4 and the second pipeline 5 respectively. The refrigerant flowing through the second pipeline 5 is cooled by the condenser 2, and the refrigerant flowing through the first pipeline 4 exchanges heat with the primary side refrigeration pipeline through the heat exchanger 3. The two paths converge at the inlet end of the liquid receiver 3 and flow into the terminal through the refrigerant pump.

[0038] In the third operating mode, when the outdoor temperature is low, such as in winter, the second pipe 5 is opened and the first pipe 4 is closed via the control valve. The refrigerant pump operates independently, and the refrigerant circulates through the second pipe 5. The refrigerant flow path at this time is as follows: Figure 3 .

[0039] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A multi-split heat pipe air conditioning system, characterized in that, include: The primary side refrigeration piping includes a compressor unit (1), a condenser (2), a throttling device, and a heat exchanger (3) connected in sequence; The secondary cooling pipeline is connected to the indoor end and includes a first pipeline (4) and a second pipeline (5) arranged in parallel. The first pipeline (4) is connected in series with the heat exchanger (3) for heat exchange, and the second pipeline (5) is connected in series with the condenser (2). The outlet end of the first pipeline (4) and the outlet end of the second pipeline (5) meet and are connected in sequence to a liquid receiver (6) and a refrigerant pump unit (7). Subcooling pipe (8), the inlet end of which is connected to the downstream of the throttling device, and the outlet end of which is connected to the suction side of the compressor unit (1); The middle section of the subcooling pipe (8) is located inside the liquid reservoir (6) for subcooling heat exchange.

2. The multi-unit heat pipe air conditioning system according to claim 1, characterized in that, The condenser (2) includes at least two heat exchange modules that can operate independently.

3. A multi-unit heat pipe air conditioning system according to claim 1, characterized in that, The inlet ends of the first pipeline (4) and the second pipeline (5) are respectively equipped with control valves.

4. A multi-split heat pipe air conditioning system according to claim 1, characterized in that, The compressor unit (1) includes a gas-liquid separator (101), an oil separator (102), and at least two compressors (103) connected in parallel.

5. A multi-unit heat pipe air conditioning system according to claim 1, characterized in that, The refrigerant pump unit (7) includes at least two refrigerant pumps connected in parallel, and each refrigerant pump is provided with a check valve at its outlet.

6. A multi-unit heat pipe air conditioning system according to claim 1, characterized in that, The heat exchanger (3) is a plate heat exchanger.

7. A multi-unit heat pipe air conditioning system according to claim 1, characterized in that, The middle section of the subcooling pipe (8) is a spiral coil structure.

8. A multi-unit heat pipe air conditioning system according to claim 1, characterized in that, The throttling device is an electronic expansion valve.

9. A multi-unit heat pipe air conditioning system according to claim 1, characterized in that, The subcooling pipe (8) is a capillary tube.

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