Carbon dioxide heat pump air conditioning system

Abstract

The utility model relates to a carbon dioxide heat pump air-conditioning system, which is characterized in that a carbon dioxide compressor is connected with a heat exchange pipe, and a living water pipe and the heat exchange pipe are in a winding heat exchange state to prepare living hot water; the four-way valve is connected with an outlet of the heat exchange pipe through an exhaust port, an air return port is connected with an air inlet of the carbon dioxide compressor, a refrigerating port is connected with the first air-cooled evaporator, a heating port is connected with the second air-cooled evaporator, and the electronic expansion valve is arranged between the first air-cooled evaporator and the second air-cooled evaporator. The cooling or heating function of the air conditioner can be achieved by controlling the flowing directions of carbon dioxide at different temperatures and states; a water inlet control valve is arranged at an inlet of the domestic water pipe, and whether domestic hot water is prepared or not can be determined according to actual requirements by controlling opening and closing of the water inlet control valve; according to the scheme, the structure is simple, simultaneous operation of the heat pump function and the air conditioner function is guaranteed, the energy consumption of a refrigerating or heating system is relatively low, the overall working efficiency is higher, resource utilization is maximized, and the purposes of energy conservation and emission reduction are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air conditioning technical field, concretely relates to a carbon dioxide heat pump air conditioning system. BACKGROUND

[0002] Air conditioner and water heater are essential household appliances in people's daily life, and these household appliances are independently controlled usually, and users need to spend more funds to purchase the two household appliances simultaneously, along with the continuous improvement of people's living standards, more and more users select heat pump water heater air conditioner combined with heat pump water heater and air conditioner, which can independently heat domestic hot water, and can also independently realize the use of cold and hot air conditioner, realize one machine multiple use, fully utilize energy, reduce cost and energy consumption, the existing heat pump water heater air conditioner is used to realize the demand of producing domestic hot water, indoor cooling in summer or heating in winter, which leads to the complexity of the overall structure of the system, increases the production and subsequent maintenance cost thereof, and simultaneously meets the demand of producing domestic hot water throughout the year, and the system operation needs to select the increase of water heater heat exchange power or through multiple compressor composite work to ensure that the above functions can be realized, and the above composition will lead to the more complex system and increase the system energy consumption, so that the overall COP value of the system is low.

[0003] The utility model discloses through the simplification structure, with carbon dioxide as system heat medium working medium, realizes the supply of domestic hot water and the simultaneous operation of air conditioner refrigeration or heating function, and the system energy consumption is relatively lower, and the overall working efficiency is higher. UTILITY MODEL CONTENTS

[0004] In view of the above existing problems, the utility model provides a carbon dioxide heat pump air conditioning system, the structure is simplified, carbon dioxide is used as system heat medium working medium, the supply of domestic hot water and the simultaneous operation of air conditioner refrigeration or heating function are realized, the system energy consumption is relatively lower, and the overall working efficiency is higher.

[0005] In order to achieve the above object, the utility model provides a kind of carbon dioxide heat pump air conditioning system, including carbon dioxide circulation unit, heat exchange box and air conditioning circulation unit;The carbon dioxide circulation unit includes carbon dioxide compressor and electronic expansion valve;Heat exchange pipe and domestic water pipe are provided in the heat exchange box, the heat exchange pipe tube passes through the heat exchange box, and its inlet and outlet are arranged in the heat exchange box outside one side, the heat exchange pipe inlet is connected with the carbon dioxide compressor gas outlet, the domestic water pipe tube passes through the heat exchange box, and is in the winding heat exchange state with the heat exchange pipe, and its inlet and outlet are arranged in the heat exchange box outside and the other side opposite to the heat exchange pipe inlet and outlet;The air conditioning circulation unit includes four-way valve, first gas-cooled evaporator and second gas-cooled evaporator connected in circulation, the electronic expansion valve is arranged between the first gas-cooled evaporator and second gas-cooled evaporator, the four-way valve includes exhaust port, back gas port, refrigeration port and heating port, the exhaust port is connected with the heat exchange pipe outlet, the back gas port is connected with the carbon dioxide compressor gas inlet, the refrigeration port is connected with the first gas-cooled evaporator, and the heating port is connected with the second gas-cooled evaporator;The four-way valve has two working modes of refrigeration mode and heating mode, the refrigeration mode is that the exhaust port is communicated with the refrigeration port, and the back gas port is communicated with the heating port;The heating mode is that the exhaust port is communicated with the heating port, and the back gas port is communicated with the refrigeration port, and the working mode of the four-way valve is switched using the control mode of electric switching valve.

[0006] Preferably, the carbon dioxide circulation unit further includes a filter assembly, which is arranged between the first gas-cooled evaporator and the electronic expansion valve.

[0007] Preferably, the filter assembly includes a gas filter and a liquid filter.

[0008] Preferably, a water inlet control valve is arranged at the inlet of the domestic water pipe, and a hot water control valve is arranged at the outlet of the domestic water pipe.

[0009] Preferably, a domestic water pump is further arranged, which is communicated with the inlet of the domestic water pipe through the water inlet control valve.

[0010] Preferably, a temperature sensor is arranged at the hot water control valve, which is respectively connected with the water inlet control valve.

[0011] Preferably, a fan is arranged in each of the first gas-cooled evaporator and the second gas-cooled evaporator.

[0012] Compared with the prior art, the carbon dioxide heat pump air conditioning system has the advantages that: the carbon dioxide heat pump air conditioning system comprises a carbon dioxide circulating unit composed of a carbon dioxide compressor and an electronic expansion valve, a heat exchange box provided with a heat exchange pipe and a domestic water pipe, and an air conditioning circulating unit composed of a four-way valve, a first air-cooled evaporator and a second air-cooled evaporator, the carbon dioxide compressor is connected with the heat exchange pipe, the domestic water pipe is in a winding heat exchange state with the heat exchange pipe to heat domestic hot water, the four-way valve is connected with the heat exchange pipe outlet through the exhaust port, the gas return port is connected with the carbon dioxide compressor gas inlet, the refrigeration port is connected with the first air-cooled evaporator, the heating port is connected with the second air-cooled evaporator, and the electronic expansion valve is arranged between the first air-cooled evaporator and the second air-cooled evaporator, so as to ensure the circulation of carbon dioxide as a heat medium working medium among the carbon dioxide circulating unit, the heat exchange box and the air conditioning circulating unit, and the flow direction of carbon dioxide with different temperatures and states is controlled through switching of the four-way valve, so that the refrigeration or heating function of the air conditioner can be realized; in addition, a water inlet control valve is arranged at the inlet of the domestic water pipe, and whether the domestic hot water is prepared or not can be determined according to actual needs and the real-time temperature of the domestic hot water by controlling the opening and closing of the water inlet control valve; the structure is simple, carbon dioxide is used as a system heat medium working medium, the heat pump function and the air conditioning function are simultaneously realized, domestic hot water is provided in winter, free domestic hot water is provided in summer, the energy consumption of the refrigeration or heating system is relatively low, the overall working efficiency is higher, resource utilization is maximized, and the purpose of energy saving and emission reduction is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structure schematic view of the carbon dioxide heat pump air conditioning system of the utility model;

[0014] Figure 2 It is a structure schematic view of the working mode of the utility model for preparing domestic hot water and simultaneously air conditioning refrigeration;

[0015] Figure 3 It is a structure schematic view of the working mode of the utility model for preparing domestic hot water and simultaneously air conditioning heating.

[0016] In the drawing: 11 - carbon dioxide compressor, 12 - electronic expansion valve, 13 - filter assembly, 2 - heat exchange box, 21 - heat exchange pipe, 22 - domestic water pipe, 23 - water inlet control valve, 24 - hot water control valve, 31 - four-way valve, 32 - exhaust port, 33 - gas return port, 34 - refrigeration port, 35 - heating port, 36 - first air-cooled evaporator, 37 - second air-cooled evaporator, 38 - fan, 4 - domestic water pump. DETAILED DESCRIPTION

[0017] To further illustrate the present application, the following embodiments will be described in conjunction with the accompanying drawings. It is particularly pointed out that the embodiments described below are only a part of the embodiments of the present application, not all. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0018] Referring to Figure 1 The present embodiment provides a carbon dioxide heat pump air conditioning system, which uses carbon dioxide as the system heat medium working substance. The system can produce domestic hot water while achieving air conditioning refrigeration or heating functions. The system comprises a carbon dioxide circulation unit, a heat exchange tank 2, an air conditioning circulation unit and a domestic water pump 4. In the present embodiment, the carbon dioxide circulation unit is used to provide and regulate the heat medium working substance in the system, comprising a carbon dioxide compressor 11 for providing high-temperature and high-pressure carbon dioxide gas, an electronic expansion valve 12 and a filter assembly 13. The carbon dioxide compressor 11 is provided with an air outlet and an air inlet. The air outlet is connected to the inlet of the heat exchange pipe 21, and the air inlet is connected to the four-way valve 31. The electronic expansion valve 12 is arranged between the first air-cooled evaporator 36 and the second air-cooled evaporator 37, and is used to intercept and depressurize the passing carbon dioxide gas. The filter is arranged between the first air-cooled evaporator 36 and the electronic expansion valve 12. The filter assembly 13 comprises a gas filter and a liquid filter.

[0019] The heat exchange tank 2 is used to produce domestic hot water, and is provided with a heat exchange pipe 21 and a domestic water pipe 22. The heat exchange pipe 21 passes through the heat exchange tank 2, and its inlet and outlet are arranged on one side of the heat exchange tank 2. The inlet of the heat exchange pipe 21 is connected to the air outlet of the carbon dioxide compressor 11. The domestic water pipe 22 passes through the heat exchange tank 2 and is in a winding heat exchange state with the heat exchange pipe 21. Its inlet and outlet are arranged on the other side of the heat exchange tank 2 opposite to the inlet and outlet of the heat exchange pipe 21. The inlet of the domestic water pipe 22 is connected to the domestic water pump 4 through the water inlet control valve 23, so as to provide normal temperature water for producing domestic hot water. The outlet of the domestic water pipe 22 is provided with a hot water control valve 24 for use of the domestic hot water. In the present embodiment, a temperature sensor is arranged at the hot water control valve 24. The temperature sensor is respectively connected to the water inlet control valve 23 in communication, so as to monitor the temperature of the domestic hot water in real time, and control the opening and closing of the water inlet control valve 23 according to the temperature.

[0020] The air conditioner circulation unit is used to realize indoor refrigeration or heating function, comprising a four-way valve 31, a first air-cooled evaporator 36 and a second air-cooled evaporator 37 connected in circulation; the four-way valve 31 is a commonly used hydraulic control element, capable of guiding the flow of gas or liquid in the hydraulic system to two different directions, and can be switched by control, specifically comprising an exhaust port 32, a return air port 33, a refrigeration port 34 and a heating port 35, wherein the exhaust port 32 is connected with the outlet of the heat exchange pipe 21, the return air port 33 is connected with the gas inlet of the carbon dioxide compressor 11, the refrigeration port 34 is connected with the first air-cooled evaporator 36, and the heating port 35 is connected with the second air-cooled evaporator 37; in this embodiment, the four-way valve 31 has two working modes of refrigeration mode and heating mode, the refrigeration mode is that the exhaust port 32 is communicated with the refrigeration port 34, and the return air port 33 is communicated with the heating port 35; the heating mode is that the exhaust port 32 is communicated with the heating port 35, and the return air port 33 is communicated with the refrigeration port 34, and the working mode of the four-way valve 31 is switched by using the control mode of the electric switching valve; the first air-cooled evaporator 36 and the second air-cooled evaporator 37 are both provided with a fan 38.

[0021] Referring to Figure 2In the present embodiment, the principle and process of the system in the working mode of producing domestic hot water while providing refrigeration are as follows: the carbon dioxide compressor 11 is powered to send high-temperature and high-pressure carbon dioxide gas to the heat exchange pipe 21, the domestic water pump 4 sends normal-temperature water to the domestic water pipe 22 through the opened water inlet control valve 23, the high-temperature and high-pressure carbon dioxide gas in the heat exchange pipe 21 exchanges heat with the normal-temperature water in the domestic water pipe 22 to produce domestic hot water, and the produced domestic hot water is finally output for use through the hot water control valve 24; the carbon dioxide gas after heat exchange is cooled to a certain extent, but is still in a high-temperature and high-pressure state, the cooling range varies according to the actual temperature of the normal-temperature water, and the variation range is between 20 and 80℃, at this time, the four-way valve 31 is in the refrigeration working mode, the carbon dioxide gas after heat exchange enters the exhaust port 32 and then enters the first air-cooled evaporator 36 through the refrigeration port 34, is subjected to secondary heat dissipation through the fan 38 therein, and then is cooled to low-temperature and high-pressure carbon dioxide gas, which enters the filter assembly 13, is filtered through the gas filter, is then cut off and depressurized by the electronic expansion valve 12 into low-temperature and low-pressure carbon dioxide liquid, enters the second air-cooled evaporator 37 to exchange heat and evaporate to absorb heat, absorbs the heat in the indoor room to realize the air conditioning refrigeration function, and accelerates the refrigeration process through the fan 38 therein; the carbon dioxide liquid after heat exchange and evaporation is converted into low-temperature and low-pressure carbon dioxide gas, enters the heating port 35, and then enters the carbon dioxide compressor 11 through the gas return port 33 to perform compression work. Thus, the complete working cycle of producing domestic hot water and air conditioning refrigeration is completed.

[0022] Referring to Figure 3In the present embodiment, the principle and process of the system producing domestic hot water while providing heating mode of operation are as follows: the carbon dioxide compressor 11 is powered to send high-temperature and high-pressure carbon dioxide gas to the heat exchange box 2 to produce domestic hot water, and the production process is consistent with the above-mentioned production of domestic hot water while providing refrigeration mode of operation; the carbon dioxide gas after heat exchange has a certain amplitude of temperature drop, but is still in a high-temperature and high-pressure state, and the amplitude of temperature drop varies according to the actual temperature of the normal-temperature water body, and the variation range is between 20 and 80℃, at this time the four-way valve 31 is in heating mode of operation, the carbon dioxide gas after heat exchange enters the exhaust port 32 and enters the second gas-cooled evaporator 37 through the heating port 35, and the high-temperature and high-pressure carbon dioxide gas is accelerated by the fan 38 therein to exchange heat with the lower-temperature gas outside to realize the air conditioning heating function; the carbon dioxide gas after heat exchange enters the electronic expansion valve 12 to be cut off and depressurized into low-temperature and low-pressure carbon dioxide liquid, which passes through the filter assembly 13 and the liquid filter, enters the first gas-cooled evaporator 36 to be evaporated and heat-absorbed to become low-temperature and low-pressure carbon dioxide gas, enters the refrigeration port 34 and enters the carbon dioxide compressor 11 again through the gas return port 33 to perform compression work. Thus, the complete working cycle of producing domestic hot water and air conditioning heating is completed.

[0023] In the present embodiment, if the temperature of the domestic hot water monitored by the temperature sensor in real time reaches the production requirement or there is no temporary production requirement of domestic hot water, the water inlet control valve 23 can be controlled to be closed in communication, the carbon dioxide compressor 11 is powered to send high-temperature and high-pressure carbon dioxide gas to the heat exchange pipe 21, at this time the normal-temperature water body in the domestic water pipe 22 exchanges heat with the high-temperature and high-pressure carbon dioxide gas, the high-temperature and high-pressure carbon dioxide gas enters the four-way valve 31, and the system performs air conditioning refrigeration or heating work alone.

[0024] In the present embodiment, the above is only an example and does not limit the protection scope of the present application.

[0025] The utility model provides a kind of carbon dioxide heat pump air conditioning system, including by carbon dioxide compressor and electronic expansion valve composition carbon dioxide circulation unit, the heat exchange tank being provided with heat exchange tube and domestic water pipe and by four-way valve, first air-cooled evaporator and second air-cooled evaporator circulation connection composition air conditioning circulation unit, the carbon dioxide compressor is connected with heat exchange tube, the domestic water pipe is with the heat exchange tube winding heat exchange state to carry out heat exchange and obtain domestic hot water;The four-way valve is connected with the heat exchange tube outlet respectively by the exhaust port, the gas return port is connected with the carbon dioxide compressor gas inlet, the refrigeration port is connected with the first air-cooled evaporator, the heating port is connected with the second air-cooled evaporator, and the electronic expansion valve is arranged between the first air-cooled evaporator and second air-cooled evaporator, to ensure that as heat medium working substance carbon dioxide is circulated between the carbon dioxide circulation unit, heat exchange tank and air conditioning circulation unit three, and by the switching of the four-way valve, the flow direction of carbon dioxide of different temperature and state is controlled, and the refrigeration or heating function of air conditioner can be realized respectively;In addition, water inlet control valve is arranged in the inlet of the domestic water pipe, by controlling the water inlet control valve opening and closing, and then whether the domestic hot water is obtained can be decided according to actual demand and real-time temperature of domestic hot water;The scheme structure is simplified, carbon dioxide is used as system heat medium working substance, realizes the simultaneous operation of heat pump function and air conditioning function, realizes domestic hot water while providing heating in winter, provides free domestic hot water when refrigerating in summer, and its refrigeration or heating system energy consumption is relatively lower, and overall working efficiency is higher, can maximize resource utilization, achieve the purpose of energy saving and emission reduction.

[0026] The above disclosed embodiments are only for introducing the utility model in detail, and cannot limit the range of the utility model, so simple improvement and change made according to the scope of the utility model claim application still belong to the protection range of the utility model.

[0027] The protection range of the utility model should be limited to the range defined. For ordinary skilled person in the art, without departing from the spirit and scope of the utility model, a number of improvements and refinements can be made, and these and refinements should be regarded as the protection range of the utility model.

Claims

1. A carbon dioxide heat pump air conditioning system, characterized by, The application relates to a carbon dioxide recycling unit, a heat exchange tank and an air conditioner circulating unit; the carbon dioxide recycling unit comprises a carbon dioxide compressor and an electronic expansion valve; the heat exchange tank is provided with heat exchange pipes and domestic water pipes; the heat exchange pipe body penetrates through the heat exchange tank, the inlet and outlet of the heat exchange pipe are arranged on one side of the heat exchange tank, the inlet of the heat exchange pipe is connected with the gas outlet of the carbon dioxide compressor, the domestic water pipe body penetrates through the heat exchange tank and is in a winding heat exchange state with the heat exchange pipe, and the inlet and outlet of the domestic water pipe are arranged on the other side of the heat exchange tank opposite to the inlet and outlet of the heat exchange pipe; the air conditioner circulating unit comprises a four-way valve, a first gas cooling evaporator and a second gas cooling evaporator which are connected in a cycle, the electronic expansion valve is arranged between the first gas cooling evaporator and the second gas cooling evaporator, the four-way valve comprises an exhaust port, a return port, a refrigeration port and a heating port, the exhaust port is connected with the outlet of the heat exchange pipe, the return port is connected with the gas inlet of the carbon dioxide compressor, the refrigeration port is connected with the first gas cooling evaporator, and the heating port is connected with the second gas cooling evaporator; the four-way valve has two working modes of a refrigeration mode and a heating mode, the refrigeration mode is that the exhaust port and the refrigeration port are connected, and the return port and the heating port are connected, the heating mode is that the exhaust port and the heating port are connected, and the return port and the refrigeration port are connected, and the working mode of the four-way valve is switched by adopting an electric switching valve control mode.

2. The carbon dioxide heat pump air conditioning system according to claim 1, wherein, The carbon dioxide recycling unit further comprises a filter assembly, and the filter assembly is arranged between the first gas cooling evaporator and the electronic expansion valve.

3. A carbon dioxide heat pump air conditioning system according to claim 2, wherein, The filter assembly comprises a gas filter and a liquid filter.

4. The carbon dioxide heat pump air conditioning system according to claim 1, wherein, The inlet of the domestic water pipe is provided with a water inlet control valve, and the outlet of the domestic water pipe is provided with a hot water control valve.

5. A carbon dioxide heat pump air conditioning system according to claim 4, wherein, A domestic water pump is further arranged, and the domestic water pump is connected with the inlet of the domestic water pipe through the water inlet control valve.

6. A carbon dioxide heat pump air conditioning system according to claim 5, wherein, A temperature sensor is arranged at the hot water control valve, and the temperature sensor is connected with the water inlet control valve.

7. The carbon dioxide heat pump air conditioning system according to claim 1, wherein, Fans are arranged in the first gas cooling evaporator and the second gas cooling evaporator.

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