Air conditioner heat pump refrigerant charging system

Abstract

The application relates to the technical field of refrigeration equipment, and particularly discloses an air conditioner heat pump refrigerant charging system, which comprises a refrigerant charging unit and a water source heat pump circulating unit, and the output end of the refrigerant charging unit is connected with the heat exchange input end of the water source heat pump circulating unit. The flow direction of the refrigerant in the heat exchanger of the water source heat pump circulating unit is switched through a countercurrent heat exchange unit, the passing diameter of the heat exchange circulating channel is adjusted by synchronously changing the refrigerant charging amount through a heat exchange flow control valve unit, the flow pressure during the heat exchange circulation of the water source heat pump circulating unit is changed, the pressure during the refrigerant charging of the refrigerant charging unit into the water source heat pump circulating unit is more close to the circulating pressure of the heat exchanger in the water source heat pump circulating unit, the temperature of the evaporation side is kept from low to high to generate slip under the constant pressure state, the temperature difference between the water source circulating in the evaporation side and the condensation side and the charging refrigerant is reduced, and the heat loss is reduced.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, specifically to an air conditioning heat pump refrigerant charging system. Background Technology

[0002] Water source heat pump units mainly consist of a compressor, evaporator, condenser, expansion valve, and auxiliary equipment such as a liquid receiver and regenerator. They achieve phase change cooling by setting up water tanks in the evaporator and condenser as heat sources and circulating refrigerant. However, in traditional refrigerant charging systems, there is a temperature difference between the charging portion that does not participate in the circulation and the refrigerant that has already started circulating in the heat exchanger channel. This can lead to heat loss during the charging and commissioning process, causing discontinuous heat exchange or efficiency fluctuations. Although existing technologies reduce heat loss by directly adjusting the output opening of the refrigerant charging system and reducing the circulation speed of the heat exchanger to control the charging flow rate and velocity, this method still causes a short-term heat exchange delay during actual operation, resulting in a decrease in circulation efficiency. Therefore, the stability in actual use is not ideal. Summary of the Invention

[0003] To address the problems in existing technologies, this invention provides an air conditioning heat pump refrigerant charging system. The technical solution adopted by this invention to solve its technical problem is as follows: an air conditioning heat pump refrigerant charging system, comprising a refrigerant charging unit and a water source heat pump circulation unit, wherein the output end of the refrigerant charging unit is connected to the heat exchange input end of the water source heat pump circulation unit, and further comprising a multi-source end monitoring module, a heat exchange surface temperature difference adjustment unit, and a charging opening control module. The charging opening control module is used to read the heat exchange cycle parameters of the water source heat pump circulation unit obtained by the multi-source end monitoring module, and to adjust the system according to the heat exchange parameters of the water source heat pump circulation unit. The refrigerant output opening of the refrigerant charging unit is adjusted by circulating parameters to eliminate heat loss generated by the water source heat pump circulating unit during refrigerant heat exchange. The heat exchange surface temperature difference adjustment unit is installed between the refrigerant charging unit and the multi-source end monitoring module. When eliminating refrigerant heat loss in the water source heat pump circulating unit, the heat exchange flow mode of the water source heat pump circulating unit is adjusted accordingly, so that the water source heat pump circulating unit can smoothly complete the transition heat exchange during the process of eliminating refrigerant heat exchange loss.

[0004] Preferably, the multi-source end monitoring module is disposed between the water source heat pump circulating unit and the heat exchange surface temperature difference adjustment unit. The multi-source end monitoring module is used to acquire the heat exchange cycle parameters of the water source heat pump circulating unit under operating conditions. The heat exchange cycle parameters include heat exchange cycle temperature, circulation pressure and circulation flow rate. The multi-source end monitoring module is also used to acquire the temperature difference between the evaporation side and the condensation side of the water source heat pump circulating unit during heat exchange cycle operation.

[0005] Preferably, the multi-source monitoring module includes a temperature sensing unit, a pressure sensing unit, and a real-time flow monitoring unit. The temperature sensing unit is arranged on the evaporator side and the condenser side of the water source heat pump circulating unit to obtain the heat exchange circulation temperature of the water source heat pump circulating unit. The pressure sensing unit and the real-time flow monitoring unit are both located between the output end of the refrigerant charging unit and the input end of the water source heat pump circulating unit to synchronously obtain the circulation pressure and circulation flow rate when the refrigerant is input into the water source heat pump circulating unit.

[0006] Preferably, the multi-source monitoring module further includes a cold and heat source temperature difference calculation unit. The cold and heat source temperature difference calculation unit is signal-connected to the temperature sensing unit. The cold and heat source temperature difference calculation unit is used to calculate the temperature difference between the evaporator side and the condenser side of the water source heat pump circulating unit in real time, and determine whether the temperature difference between the two sides exceeds the preset difference value of the conventional cycle.

[0007] Preferably, the heat exchange surface temperature difference adjustment unit includes a counter-current heat exchange unit, a heat exchange flow control valve unit, and a cold and heat source dynamic flow direction control unit. The counter-current heat exchange unit is connected to the heat exchanger in the water source heat pump circulation unit. The cold and heat source dynamic flow direction control unit is signal-connected to the counter-current heat exchange unit and the heat exchange flow control valve unit. When the refrigerant charging unit performs refrigerant heat loss elimination compensation, the cold and heat source dynamic flow direction control unit sends an adjustment signal to the counter-current heat exchange unit, and switches the flow direction of the refrigerant along the heat exchanger in the water source heat pump circulation unit through the counter-current heat exchange unit. The heat exchange flow control valve unit is installed in the heat exchanger channel of the water source heat pump circulation unit to reduce the circulation pressure of the refrigerant when circulating inside the heat exchanger during flow direction switching.

[0008] Preferably, the heat exchange surface temperature difference adjustment unit further includes a sliding temperature single-item monitoring unit, which is signal-connected to the temperature sensing unit.

[0009] Preferably, the sliding temperature single-item monitoring unit is used to obtain whether the refrigerant charged in the water source heat pump circulation unit has a temperature slip during the refrigerant heat elimination process, and to send a reset signal to the charging opening control module after the temperature slip.

[0010] Preferably, the charging opening control module is located between the refrigerant charging unit and the water source heat pump circulation unit, and the charging opening control module is signal-connected to the multi-source end monitoring module.

[0011] Preferably, the filling opening control module includes a microprocessor controller and a terminal opening control unit.

[0012] Preferably, after the microprocessor controller acquires the stabilization of the monitoring data from the multi-source end monitoring module, it sends a reset signal to the terminal opening control unit, which then resets the opening of the refrigerant charging unit's output terminal.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The heat exchange cycle temperature of the evaporator and condenser sides of the water source heat pump circulating unit is obtained by setting a temperature sensing unit, and the temperature difference between the evaporator and condenser sides of the water source heat pump circulating unit during heat exchange cycle operation is obtained by a cold / heat source temperature difference measurement unit. When the heat exchange temperature difference is large, the charging opening control module sends a corresponding opening adjustment signal to the refrigerant charging unit to change the refrigerant charging amount, eliminating heat loss caused by the temperature difference. Simultaneously, the heat source dynamic flow control unit sends an adjustment signal to the counter-current heat exchange unit, thereby controlling the heat loss through the counter-current heat exchange unit. The refrigerant flow direction in the heat exchanger of the water source heat pump circulating unit is switched by the heat exchange flow control valve unit, which adjusts the diameter of the heat exchange circulation channel according to the change of refrigerant charge amount. This changes the flow pressure when the water source heat pump circulating unit performs heat exchange circulation, making the pressure of the refrigerant charging unit charging the refrigerant into the water source heat pump circulating unit closer to the circulation pressure of the heat exchanger in the water source heat pump circulating unit. This maintains the temperature of the evaporator side under constant pressure, causing a temperature slip from low to high. The temperature difference between the circulating water and the charged refrigerant on the evaporator and condenser sides is reduced, thereby reducing heat loss. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a flowchart of an air conditioning heat pump refrigerant charging system according to the present invention.

[0016] In the diagram: 1. Refrigerant charging unit; 2. Water source heat pump circulation unit; 3. Multi-source end monitoring module; 4. Heat exchange surface temperature difference adjustment unit; 5. Charging opening control module. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] like Figure 1As shown, the air conditioning heat pump refrigerant charging system of the present invention includes a refrigerant charging unit 1 and a water source heat pump circulation unit 2. The output end of the refrigerant charging unit 1 is connected to the heat exchange input end of the water source heat pump circulation unit 2. It also includes a multi-source end monitoring module 3, a heat exchange surface temperature difference adjustment unit 4, and a charging opening control module 5. The charging opening control module 5 is used to read the heat exchange cycle parameters of the water source heat pump circulation unit 2 obtained by the multi-source end monitoring module 3, and to adjust the charging opening parameters according to the heat exchange cycle parameters of the water source heat pump circulation unit 2. The refrigerant output opening of the refrigerant charging unit 1 is adjusted to eliminate the heat loss generated by the water source heat pump circulation unit 2 during refrigerant heat exchange. The heat exchange surface temperature difference adjustment unit 4 is installed between the refrigerant charging unit 1 and the multi-source end monitoring module 3. The heat exchange surface temperature difference adjustment unit 4 is used to adjust the heat exchange flow mode of the water source heat pump circulation unit 2 when eliminating the refrigerant heat loss, so that the water source heat pump circulation unit 2 can smoothly complete the transition heat exchange during the process of eliminating the refrigerant heat loss.

[0019] In this embodiment, to address the problem that existing technologies reduce heat loss by directly adjusting the output opening of the refrigerant charging system and reducing the circulation speed of the heat exchanger, thereby controlling the charging flow rate and velocity, but this method still results in a short-term heat exchange delay and a decrease in circulation efficiency during actual operation, this invention proposes an air conditioning heat pump refrigerant charging system. This system changes the refrigerant charging amount by sending a corresponding opening adjustment signal to the refrigerant charging unit 1 through the charging opening control module 5. This eliminates heat loss caused by temperature differences while simultaneously adjusting the diameter of the heat exchange circulation channel based on the change in refrigerant charging amount. This alters the flow pressure during heat exchange circulation in the water source heat pump circulation unit 2, making the pressure of the refrigerant charging unit 1 charging the refrigerant into the water source heat pump circulation unit 2 closer to the circulation pressure of the heat exchanger in the water source heat pump circulation unit 2. This maintains a temperature gradient from low to high on the evaporator side under constant pressure, minimizing the temperature difference between the heat source and the refrigerant at both ends of the evaporator and condenser, thereby reducing heat loss due to temperature difference heat transfer and solving this technical problem.

[0020] In an optional embodiment of this example, the multi-source monitoring module 3 is disposed between the water source heat pump circulating unit 2 and the heat exchange surface temperature difference adjustment unit 4. The multi-source monitoring module 3 is used to acquire the heat exchange cycle parameters of the water source heat pump circulating unit 2 under operating conditions. The heat exchange cycle parameters include heat exchange cycle temperature, circulation pressure and circulation flow rate. The multi-source monitoring module 3 is also used to acquire the temperature difference between the evaporator side and the condenser side of the water source heat pump circulating unit 2 during heat exchange cycle operation.

[0021] In this embodiment, both the refrigerant charging unit 1 and the water source heat pump circulation unit 2 are existing refrigerant charging and air conditioning heat pumps. The present invention aims to improve the operation mode during charging. During normal operation, the heat exchange circulation temperature of the evaporator side and the condenser side of the water source heat pump circulation unit 2 can be obtained through the temperature sensing unit, and the temperature difference between the evaporator side and the condenser side of the water source heat pump circulation unit 2 during heat exchange circulation can be obtained by the cold and heat source temperature difference calculation unit. When the heat exchange temperature difference is large, the charging opening control module 5 sends a corresponding opening adjustment signal to the refrigerant charging unit 1 to change the refrigerant charging amount and eliminate the heat loss caused by the temperature difference.

[0022] In an optional embodiment of this example, the multi-source monitoring module 3 includes a temperature sensing unit, a pressure sensing unit, and a real-time flow monitoring unit. The temperature sensing unit is arranged on the evaporation side and the condensation side of the water source heat pump circulating unit 2 to obtain the operating temperature of the water source heat pump circulating unit 2 during heat exchange circulation. The pressure sensing unit and the real-time flow monitoring unit are both located between the output end of the refrigerant charging unit 1 and the input end of the water source heat pump circulating unit 2 to synchronously obtain the circulation pressure and circulation flow rate when the refrigerant is input into the water source heat pump circulating unit 2.

[0023] In this embodiment, the pressure sensing unit and the real-time flow monitoring unit are used to measure the flow rate of refrigerant when the refrigerant charging unit 1 charges the water source heat pump circulation unit 2. The cold and heat source dynamic flow control unit sends adjustment signals to the counter-current heat exchange unit and the heat exchange flow control valve unit according to the flow rate and pressure of the newly charged refrigerant in the water source heat pump circulation unit 2. The counter-current heat exchange unit switches the flow direction of the refrigerant in the heat exchanger of the water source heat pump circulation unit 2, and the heat exchange flow control valve unit adjusts the diameter of the heat exchange circulation channel in sync with the change of refrigerant charge amount, so that the current circulation flow speed of the heat exchanger in the water source heat pump circulation unit 2 is close to the refrigerant charge amount and charge pressure after the adjustment of the refrigerant charging unit 1.

[0024] In an optional embodiment of this example, the multi-source monitoring module 3 further includes a cold and heat source temperature difference calculation unit. The cold and heat source temperature difference calculation unit is connected to the temperature sensing unit. The cold and heat source temperature difference calculation unit is used to calculate the temperature difference between the evaporator side and the condenser side of the water source heat pump circulating unit 2 in real time, and determine whether the temperature difference between the two sides exceeds the preset difference value of the conventional cycle.

[0025] In one optional embodiment of this example, the charging opening control module 5 is disposed between the refrigerant charging unit 1 and the water source heat pump circulation unit 2. The charging opening control module 5 is signal-connected to the multi-source end monitoring module 3. The charging opening control module 5 includes a microprocessor controller and a terminal opening control unit.

[0026] In one optional embodiment of this example, after the microprocessor controller obtains the monitoring data from the multi-source end monitoring module 3 and stabilizes, it sends a reset signal to the terminal opening control unit, which then resets the opening of the refrigerant charging unit 1's output terminal.

[0027] In an optional embodiment of this example, the heat exchange surface temperature difference adjustment unit 4 includes a counter-current heat exchange unit, a heat exchange flow control valve unit, and a cold and heat source dynamic flow direction control unit. The counter-current heat exchange unit is connected to the heat exchanger in the water source heat pump circulation unit 2. The cold and heat source dynamic flow direction control unit is signal-connected to the counter-current heat exchange unit and the heat exchange flow control valve unit. When the refrigerant charging unit 1 performs refrigerant heat loss elimination compensation, the cold and heat source dynamic flow direction control unit sends an adjustment signal to the counter-current heat exchange unit. The counter-current heat exchange unit switches the flow direction of the refrigerant along the heat exchanger in the water source heat pump circulation unit 2. The heat exchange flow control valve unit is installed in the heat exchanger channel of the water source heat pump circulation unit 2 to reduce the circulation pressure of the refrigerant when it circulates inside the heat exchanger during the flow direction switching.

[0028] In an optional embodiment of this example, the heat exchange surface temperature difference adjustment unit 4 further includes a sliding temperature single-item monitoring unit. The sliding temperature single-item monitoring unit is signal-connected to the temperature sensing unit. The sliding temperature single-item monitoring unit is used to obtain whether the refrigerant charged in the water source heat pump circulation unit 2 has a temperature slip during the refrigerant heat elimination process, and to send a reset signal to the charging opening control module 5 after the temperature slip.

[0029] In this embodiment, after the temperature slippage of the refrigerant charged in the water source heat pump circulating unit 2 is obtained by the slip temperature single-item monitoring unit, the temperature difference between the evaporator side and the condenser side of the water source heat pump circulating unit 2 is measured by the cold and heat source temperature difference calculation unit to determine whether the temperature difference is stable. After it is stable, the cold and heat source temperature difference calculation unit and the slip temperature single-item monitoring unit simultaneously send the data to the microprocessor controller. The microprocessor controller sends a reset signal to the terminal opening control unit. The terminal opening control unit synchronously controls the opening of the refrigerant charging unit 1 output terminal (in this embodiment, the refrigerant charging unit 1 output terminal is the expansion valve connected to the input terminal of the water source heat pump circulating unit 2) and the opening of the heat exchange flow control valve unit (a solenoid valve) to reset to the original state, and continues to complete the normal operation process.

[0030] The working principle of this invention is as follows: When activated, the temperature sensing unit acquires the heat exchange cycle temperature of the evaporator and condenser sides of the water source heat pump circulating unit 2, and the cold and heat source temperature difference calculation unit acquires the temperature difference between the evaporator and condenser sides of the water source heat pump circulating unit 2 during heat exchange cycle operation. When the heat exchange temperature difference is large, the charging opening control module 5 sends a corresponding opening adjustment signal to the refrigerant charging unit 1 to change the refrigerant charging amount, thereby eliminating the heat loss caused by the temperature difference. At the same time, while adjusting the opening of the input end of the refrigerant charging unit 1 to eliminate heat loss, the cold and heat source dynamic flow control unit sends an adjustment signal to the counterflow heat exchange unit, which switches the flow direction of the refrigerant along the heat exchanger of the water source heat pump circulating unit 2 (wherein, the heat exchanger of the water source heat pump circulating unit 2 is a plate heat exchanger), and the heat exchange flow control valve unit synchronously adjusts the flow direction according to the cold and heat source temperature difference. The change in refrigerant charge volume adjusts the diameter of the heat exchange circulation channel, altering the flow pressure during heat exchange circulation in the water source heat pump circulation unit 2. This makes the pressure at which the refrigerant charging unit 1 charges the refrigerant into the water source heat pump circulation unit 2 closer to the circulation pressure of the heat exchanger in the water source heat pump circulation unit 2. (The principle is that when the refrigerant reaches the evaporator side at constant pressure, the temperature slides from low to high. In the current state, the cold water temperature on the evaporator side is higher than the refrigerant temperature, and the water temperature continuously decreases as heat exchange proceeds. When the refrigerant reaches the condenser side at constant pressure, the hot water temperature on the condenser side is lower than the refrigerant temperature, and the water temperature increases as heat exchange occurs. At this time, due to the existence of the refrigerant sliding temperature, the temperature difference between the refrigerant and the water source on both sides decreases.) This maintains the temperature sliding from low to high on the evaporator side under constant pressure, reducing the temperature difference between the circulating water source and the charged refrigerant on the evaporator and condenser sides, thereby reducing heat loss.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air conditioner heat pump refrigerant charging system, comprising a refrigerant charging unit (1) and a water source heat pump circulating unit (2), the output end of the refrigerant charging unit (1) is connected with the heat exchange input end of the water source heat pump circulating unit (2), characterized in that, Also include multi-source end monitoring module (3), heat exchange surface temperature difference debugging machine group (4) and filling opening control module (5), the filling opening control module (5) is used to read the water source heat pump circulating unit (2) heat exchange cycle parameter obtained by the multi-source end monitoring module (3), and adjusts the refrigerant filling unit (1) refrigerant output opening according to the water source heat pump circulating unit (2) heat exchange cycle parameter, eliminates the heat loss generated by the water source heat pump circulating unit (2) when refrigerant heat exchange; The heat exchange surface temperature difference debugging machine group (4) is installed between the refrigerant filling unit (1) and the multi-source end monitoring module (3), and the heat exchange surface temperature difference debugging machine group (4) is used to correspond to the heat exchange flow direction mode of the water source heat pump circulating unit (2) when eliminating the refrigerant heat loss, so that the water source heat pump circulating unit (2) can smoothly complete the transition heat exchange in the process of eliminating the refrigerant heat loss; The multi-source end monitoring module (3) is arranged between the water source heat pump circulating unit (2) and the heat exchange surface temperature difference debugging machine group (4), and the multi-source end monitoring module (3) is used to obtain the heat exchange cycle parameter of the water source heat pump circulating unit (2) in the running state, and the heat exchange cycle parameter includes heat exchange cycle temperature, cycle through pressure and cycle through flow. The multi-source end monitoring module (3) is also used to obtain the temperature difference between the evaporation side and the condensation side of the water source heat pump circulating unit (2) during heat exchange cycle operation. The multi-source end monitoring module (3) includes a temperature sensing unit, a pressure sensing unit and a flow real-time monitoring unit. The temperature sensing unit is arranged on the evaporation side and the condensation side of the water source heat pump circulating unit (2), and is used to obtain the heat exchange cycle temperature of the water source heat pump circulating unit (2). The pressure sensing unit and the flow real-time monitoring unit are arranged between the output end of the refrigerant filling unit (1) and the input end of the water source heat pump circulating unit (2), and are used to synchronously obtain the cycle through pressure and the cycle through flow when the refrigerant is input to the water source heat pump circulating unit (2). The multi-source end monitoring module (3) further comprises a cold and heat source temperature difference calculation unit, which is signal connected with the temperature sensing unit. The cold and heat source temperature difference calculation unit is used to calculate the temperature difference between the evaporation side and the condensation side of the water source heat pump circulating unit (2) in real time, and determine whether the temperature difference between the two sides exceeds the difference value of the conventional cycle preset.

2. An air conditioner and heat pump refrigerant charging system according to claim 1 wherein: The heat exchange surface temperature difference debugging unit (4) comprises a counter-flow heat exchange unit, a heat exchange flow control valve unit and a cold and heat source dynamic flow direction control unit, the counter-flow heat exchange unit is connected with the heat exchanger in the water source heat pump circulating unit (2), the cold and heat source dynamic flow direction control unit is signal connected with the counter-flow heat exchange unit and the heat exchange flow control valve unit, when the refrigerant charging unit (1) eliminates and compensates the refrigerant heat loss, the cold and heat source dynamic flow direction control unit sends a debugging signal to the counter-flow heat exchange unit, the counter-flow heat exchange unit switches the flow direction of the refrigerant along the heat exchanger in the water source heat pump circulating unit (2), the heat exchange flow control valve unit is arranged in the heat exchanger channel of the water source heat pump circulating unit (2) and is used for reducing the circulation through pressure of the refrigerant in the heat exchanger when the flow direction is switched.

3. An air conditioner and heat pump refrigerant charging system according to claim 1 wherein: The heat exchange surface temperature difference debugging unit (4) further comprises a glide temperature single monitoring unit, and the glide temperature single monitoring unit is signal connected with the temperature sensing unit.

4. An air conditioner and heat pump refrigerant charging system as set forth in claim 3, characterized by: The glide temperature single monitoring unit is used for obtaining whether the refrigerant charged in the water source heat pump circulating unit (2) generates temperature glide in the refrigerant heat elimination process, and sends a reset signal to the charging opening degree control module (5) after the temperature glide.

5. An air conditioner and heat pump refrigerant charging system as set forth in claim 1, further characterized by: The charging opening degree control module (5) is arranged between the refrigerant charging unit (1) and the water source heat pump circulating unit (2), and the charging opening degree control module (5) is signal connected with the multi-source end monitoring module (3).

6. An air conditioner and heat pump refrigerant charging system as set forth in claim 5 wherein: The charging opening degree control module (5) comprises a micro-processing controller and a terminal opening degree control unit.

7. An air conditioner and heat pump refrigerant charging system as set forth in claim 6 wherein: The micro-processing controller sends a reset signal to the terminal opening degree control unit after the monitoring data of the multi-source end monitoring module (3) is stabilized, and the terminal opening degree control unit resets the output terminal opening degree of the refrigerant charging unit (1).

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