A multi-connected ice storage air conditioner

Abstract

The utility model provides a kind of multi-connected ice storage air conditioner, including compressor, oil separator, four-way valve, outdoor heat exchanger, heating expansion valve, first check valve, liquid accumulator, supercooling expansion valve, supercooler, refrigeration expansion valve, second check valve, indoor heat exchanger, ice storage expansion valve, fluorine pump, ice storage device, gas-liquid separator and first control valve, second control valve, third control valve, fourth control valve, fifth control valve, sixth control valve.Compared with large ice storage central air conditioner, the multi-connected ice storage air conditioner provided by the utility model is suitable for household and small commercial ice storage air conditioner without ethylene glycol circulation, chilled water circulation and cooling water circulation.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology, and in particular relates to a multi-split ice storage air conditioner. Background Technology

[0002] Ice storage air conditioners utilize off-peak electricity at night to store ice, which is then melted during peak daytime electricity consumption to provide cooling. This helps balance the grid load, and users can save on air conditioning operating costs by taking advantage of the peak-valley electricity price difference. They are increasingly widely used in large central air conditioning systems. Currently, however, no such products are used in residential or small air conditioning systems.

[0003] Large-scale ice storage central air conditioning, such as Figure 1 As shown. During ice making, the dual-mode chiller transfers cooling capacity from the refrigerant to ethylene glycol, which is then circulated by the ethylene glycol pump to the ice storage unit for ice production. During cooling, the dual-mode chiller transfers cooling capacity from the refrigerant to ethylene glycol, which is then circulated by the ethylene glycol pump through a plate heat exchanger to the chilled water, and finally circulated by the chilled water pump through the terminal fan coil units to the indoor air. During ice melting and cooling, the ethylene glycol pump circulates the cooling capacity from the ice storage unit and transfers it to the chilled water through the plate heat exchanger. In all these cooling capacity transfer processes, both the ethylene glycol pump and the chilled water pump consume a large amount of energy. Both pumps deliver sensible heat, resulting in high flow rates and energy consumption. Each transfer of cooling capacity from the refrigerant to the ethylene glycol, then to the chilled water, and finally to the indoor air requires a temperature difference. During this transfer, the quality of the cooling capacity gradually decreases. To achieve the same comfortable indoor environment, the dual-mode chiller needs to provide a higher quality of cooling capacity, thus reducing its efficiency.

[0004] Large-scale ice storage central air conditioning systems have many auxiliary equipment, including dual-mode refrigeration units and ice storage devices, as well as glycol pumps, chilled water pumps, cooling water pumps, cooling towers, plate heat exchangers, etc. In addition, the internal structure of the dual-mode refrigeration unit is also particularly complex, which will make the operation and control of the entire system complicated and unsuitable for small projects. Utility Model Content

[0005] The purpose of this utility model is to provide a multi-split ice storage air conditioner suitable for small projects.

[0006] Therefore, the above-mentioned objective of this utility model is achieved through the following technical solution: A multi-split ice storage air conditioner includes a compressor, an oil separator, a four-way valve, an outdoor heat exchanger, a heating expansion valve, a first one-way valve, a liquid receiver, a subcooling expansion valve, a subcooler, a cooling expansion valve, a second one-way valve, an indoor heat exchanger, an ice storage expansion valve, a refrigerant pump, an ice storage device, a gas-liquid separator, and a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve, and a sixth control valve. The compressor, oil separator, and four-way valve are connected in series; the four-way valve is connected to the oil separator, outdoor heat exchanger, gas-liquid separator, indoor heat exchanger, and ice storage device respectively. The outdoor heat exchanger, the first one-way valve, the liquid receiver, the subcooler, the first control valve, the refrigeration expansion valve, the indoor heat exchanger, the second control valve, and the four-way valve are connected in series. The second control valve is connected to the four-way valve. The two ends of the first one-way valve are connected in parallel with the thermal expansion valve. The two ends of the refrigeration expansion valve are connected in parallel with the second one-way valve. The liquid receiver, the subcooling expansion valve, the subcooler, and the gas-liquid separator are also connected in series. The subcooler, the third control valve, the ice storage expansion valve, the ice storage device, the fourth control valve, and the four-way valve are connected in series; the fourth control valve is connected to the four-way valve. The ice storage device, the fifth control valve, the refrigerant pump, the refrigeration expansion valve, the indoor heat exchanger, and the sixth control valve are connected in series.

[0007] While adopting the above technical solutions, this utility model may also adopt or combine the following technical solutions: As a preferred technical solution of this utility model: port a of the four-way valve is connected to the oil separator, port b of the four-way valve is connected to the outdoor heat exchanger, port c of the four-way valve is connected to the gas-liquid separator, and port d of the four-way valve is connected to the indoor heat exchanger or the ice storage device respectively. The d-port of the four-way valve is connected to either the second control valve or the fourth control valve.

[0008] As a preferred technical solution of this utility model: the ice storage device consists of an insulated shell, a heat exchange coil inside the insulated shell, an energy storage medium inside the insulated shell, and several sensors.

[0009] As a preferred technical solution of this utility model, the energy storage medium is a phase change material.

[0010] As a preferred technical solution of this utility model, the energy storage medium is water.

[0011] As a preferred technical solution of this utility model: the sensor is a temperature sensor, a pressure sensor, or a liquid level sensor; The pressure sensor and temperature sensor are installed at the inlet and outlet of the heat exchange coil. The liquid level sensor is installed on the inner wall of the insulation shell or on the inner top of the insulation shell.

[0012] As a preferred embodiment of this utility model, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the sixth control valve are solenoid valves or electric ball valves.

[0013] This utility model provides a multi-split ice storage air conditioner. Compared with large-scale ice storage central air conditioning systems, it eliminates the need for ethylene glycol circulation, chilled water circulation, and cooling water circulation, making it suitable for both residential and small-scale commercial use. Specifically, it offers the following advantages: 1) Direct refrigerant path replaces multi-stage circulation: In traditional systems, the cold energy transfer path is "refrigerant → ethylene glycol → chilled water → air", which requires a pump to drive the intermediate fluid; while in this utility model, the refrigerant circulates directly between the compressor, heat exchanger, ice storage device and multiple valves, and the cold energy is transferred from the refrigerant to the target component (such as indoor air or ice storage device) in one go, eliminating the intermediate link driven by the pump.

[0014] 2) Integrated valve control optimizes the flow path: Through the coordination between the four-way valve and the operating condition switching valves (first control valve to sixth control valve), the refrigerant path can be automatically switched in different modes, avoiding the need for an additional pump. For example, in the ice-melting cooling mode, the refrigerant pump replaces the compressor to drive the refrigerant flow. The refrigerant pump delivers latent heat, and its energy consumption is much lower than that of a traditional water pump. Attached Figure Description

[0015] Figure 1 This is a structural diagram of an ice storage air conditioner in the existing technology.

[0016] Figure 2 This is a structural diagram of the multi-split ice storage air conditioner provided by this utility model.

[0017] Figure 3 This is a structural diagram of a multi-split ice storage air conditioner in cooling mode.

[0018] Figure 4 This is a structural diagram of a multi-split ice storage air conditioner in ice storage mode.

[0019] Figure 5 This is a structural diagram of a multi-split ice storage air conditioner in ice melting and cooling mode.

[0020] Figure 6 This is a structural diagram of a multi-split ice storage air conditioner in heating mode. Detailed Implementation

[0021] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0022] A multi-split ice storage air conditioner includes a compressor 111, an oil separator 112, a four-way valve 113, an outdoor heat exchanger 114, a heating expansion valve 131, a first one-way valve 121, a liquid receiver 115, a subcooling expansion valve 132, a subcooler 116, a cooling expansion valve 133, a second one-way valve 122, an indoor heat exchanger 117, an ice storage expansion valve 134, a refrigerant pump 141, an ice storage device 118, a gas-liquid separator 119, and a first control valve V1, a second control valve V2, a third control valve V3, a fourth control valve V4, a fifth control valve V5, and a sixth control valve V6. The compressor 111, oil separator 112, and four-way valve 113 are connected in series; the four-way valve 113 is connected to the oil separator 112, outdoor heat exchanger 114, gas-liquid separator 119, indoor heat exchanger 117, and ice storage device 118 respectively. The outdoor heat exchanger 114, the first one-way valve 121, the liquid receiver 115, the subcooler 116, the first control valve V1, the refrigeration expansion valve 133, the indoor heat exchanger 117, the second control valve V2, and the four-way valve 113 are connected in series; the second control valve V2 is connected to the four-way valve 113; the two ends of the first one-way valve 121 are connected in parallel to the thermal expansion valve 131; the two ends of the refrigeration expansion valve 133 are connected in parallel to the second one-way valve 122; the liquid receiver 115, the subcooling expansion valve 132, the subcooler 116, and the gas-liquid separator 119 are also connected in series. The subcooler 116, the third control valve V3, the ice storage expansion valve 134, the ice storage device 118, the fourth control valve V4, and the four-way valve 113 are connected in series; the fourth control valve V4 is connected to the four-way valve 113. The ice storage device 118, the fifth control valve V5, the refrigerant pump 141, the refrigeration expansion valve 133, the indoor heat exchanger 117, and the sixth control valve V6 are connected in series.

[0023] In this embodiment: port a of the four-way valve 113 is connected to the oil separator 112, port b of the four-way valve 113 is connected to the outdoor heat exchanger 114, port c of the four-way valve 113 is connected to the gas-liquid separator 119, and port d of the four-way valve 113 is connected to the indoor heat exchanger 117 or the ice storage device 118 respectively. The d port of the four-way valve 113 is connected to either the second control valve V2 or the fourth control valve V4.

[0024] In this embodiment, the ice storage device 118 consists of an insulated shell, a heat exchange coil inside the insulated shell, an energy storage medium inside the insulated shell, and several sensors.

[0025] In this embodiment, the energy storage medium is a phase change material.

[0026] In this embodiment, the energy storage medium is water.

[0027] In this embodiment: the sensors are a temperature sensor, a pressure sensor, and a liquid level sensor; Pressure and temperature sensors are installed at the inlet and outlet of the heat exchange coil. The liquid level sensor is installed on the inner wall of the insulation shell or on the inner top of the insulation shell.

[0028] In this embodiment: the first control valve V1, the second control valve V2, the third control valve V3, the fourth control valve V4, the fifth control valve V5, and the sixth control valve V6 are solenoid valves or electric ball valves.

[0029] Specifically, the above-mentioned multi-split ice storage air conditioner controls its operating conditions in the following way: Table 1 Control Table for Different Operating Modes Cooling mode operation: The refrigerant passes through the compressor, oil separator, four-way valve ab, outdoor heat exchanger, first check valve, and receiver, and then splits into two paths. One path passes through the cooler, first control valve V1, refrigeration expansion valve, indoor heat exchanger, second control valve V2, and four-way valve dc. The other path passes through the refrigeration expansion valve and subcooler. After mixing, the refrigerant enters the gas-liquid separator and returns to the compressor, completing the refrigeration cycle.

[0030] Ice storage mode: The refrigerant passes through the compressor, oil separator, four-way valve ab, outdoor heat exchanger, first check valve, and liquid receiver, and then splits into two paths. One path passes through the cooler, third control valve V3, ice storage expansion valve, ice storage device, fourth control valve V4, and four-way valve dc. The other path passes through the cold expansion valve and subcooler. After mixing, the refrigerant enters the gas-liquid separator and returns to the compressor, completing the ice storage cycle.

[0031] Ice melting and cooling mode: The refrigerant passes through the ice storage device, the fifth control valve V5, the refrigerant pump, the refrigeration expansion valve, the indoor heat exchanger, the sixth control valve V6, and returns to the ice storage device to complete the ice melting and cooling cycle.

[0032] Heating mode operation: The refrigerant passes through the compressor, oil separator, four-way valve AD, second control valve V2, indoor heat exchanger, second check valve, first control valve V1, subcooler, liquid receiver, heating expansion valve, outdoor heat exchanger, four-way valve BC, gas-liquid separator, and returns to the compressor to complete the heating cycle.

[0033] The above specific embodiments are used to explain and illustrate the present utility model, and are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made to the present utility model within the spirit and protection scope of the claims shall fall within the protection scope of the present utility model.

Claims

1. A multi-split ice storage air conditioner, characterized in that: Includes a compressor, oil separator, four-way valve, outdoor heat exchanger, heating expansion valve, first check valve, liquid receiver, subcooling expansion valve, subcooler, refrigeration expansion valve, second check valve, indoor heat exchanger, ice storage expansion valve, refrigerant pump, ice storage device, gas-liquid separator, and first control valve, second control valve, third control valve, fourth control valve, fifth control valve, and sixth control valve; The compressor, oil separator, and four-way valve are connected in series; the four-way valve is connected to the oil separator, outdoor heat exchanger, gas-liquid separator, indoor heat exchanger, and ice storage device respectively. The outdoor heat exchanger, the first one-way valve, the liquid receiver, the subcooler, the first control valve, the refrigeration expansion valve, the indoor heat exchanger, the second control valve, and the four-way valve are connected in series. The second control valve is connected to the four-way valve. The two ends of the first one-way valve are connected in parallel with the thermal expansion valve. The two ends of the refrigeration expansion valve are connected in parallel with the second one-way valve. The liquid receiver, the subcooling expansion valve, the subcooler, and the gas-liquid separator are also connected in series. The subcooler, the third control valve, the ice storage expansion valve, the ice storage device, the fourth control valve, and the four-way valve are connected in series; the fourth control valve is connected to the four-way valve. The ice storage device, the fifth control valve, the refrigerant pump, the refrigeration expansion valve, the indoor heat exchanger, and the sixth control valve are connected in series.

2. The multi-split ice storage air conditioner according to claim 1, characterized in that: Port a of the four-way valve is connected to the oil separator, port b of the four-way valve is connected to the outdoor heat exchanger, port c of the four-way valve is connected to the gas-liquid separator, and port d of the four-way valve is connected to the indoor heat exchanger or the ice storage device respectively. The d-port of the four-way valve is connected to either the second control valve or the fourth control valve.

3. The multi-split ice storage air conditioner according to claim 1, characterized in that: The ice storage device consists of an insulated shell, a heat exchange coil inside the insulated shell, an energy storage medium inside the insulated shell, and several sensors.

4. The multi-split ice storage air conditioner according to claim 3, characterized in that: The energy storage medium is a phase change material.

5. The multi-split ice storage air conditioner according to claim 3 or 4, characterized in that: The energy storage medium is water.

6. The multi-split ice storage air conditioner according to claim 3, characterized in that: The sensors are temperature sensors, pressure sensors, and liquid level sensors; The pressure sensor and temperature sensor are installed at the inlet and outlet of the heat exchange coil. The liquid level sensor is installed on the inner wall of the insulation shell or on the inner top of the insulation shell.

7. The multi-split ice storage air conditioner according to claim 1, characterized in that: The first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the sixth control valve are solenoid valves or electric ball valves.

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