Constant-temperature and constant-humidity air conditioner

Abstract

The utility model belongs to the technical field of air conditioners, and provides a constant-temperature and constant-humidity air conditioner which comprises an indoor unit and an outdoor air heat exchanger. The indoor unit comprises a cavity, a compressor, a four-way reversing valve, a heat storage device, an indoor air heat exchanger, a fan and an indoor air reheating heat exchanger, and an air inlet and an air outlet are formed in the outer wall of the cavity. According to the constant-temperature and constant-humidity air conditioner, the heat storage device and the indoor air heat exchanger are embedded into an air conditioning system in a series connection mode. When the outdoor air heat exchanger is seriously frosted and needs to be defrosted, heat in the heat storage device can be preferentially utilized, heat is prevented from being directly taken from indoor air, and indoor temperature and humidity can be more accurately controlled. When indoor air needs to be reheated after being cooled and dehumidified in summer, condensation heat can be recycled through the indoor air reheating heat exchanger and used for conducting reheating treatment on cooled and dehumidified supercooling air. In this way, it can be guaranteed that the indoor temperature and humidity are accurately controlled, and meanwhile the electric reheating energy consumption of indoor air after dehumidification is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of air conditioners, and in particular relates to a constant temperature and humidity air conditioner. Background Art

[0002] Air source heat pump technology has been widely used in the field of building refrigeration and air conditioning. It can provide both cooling and heating, and is an energy-saving and environmentally friendly technology. However, air source heat pump air conditioners will face the problem of frosting of outdoor heat exchangers when providing heating in winter, especially in cold and humid areas, which seriously restricts the widespread application of air source heat pumps.

[0003] Constant temperature and humidity air conditioning is a kind of technological air conditioning. In civil buildings, it is usually used in areas such as collection warehouses and archive warehouses where indoor temperature and humidity need to be strictly controlled for a long time. It is also widely used in industrial fields such as electronic manufacturing, medical and health care, and biopharmaceuticals. Due to the need to accurately control the temperature and humidity of indoor air, in cooling conditions, the indoor air needs to be reheated after being cooled and dehumidified by the indoor air heat exchanger in order to achieve the purpose of accurately controlling relative humidity, reducing the temperature difference of the air supply, and avoiding frequent start and stop of the compressor.

[0004] However, in winter heating conditions, when the outdoor heat exchanger is severely frosted, it needs to be defrosted. When defrosting, conventional constant temperature and humidity air conditioners need to absorb heat directly from the indoor air through the indoor air heat exchanger, resulting in the inability to maintain the indoor air temperature and humidity during the defrosting period. At the same time, the electric heater will also generate a large amount of energy consumption. In addition, in summer cooling conditions, in order to accurately control the indoor temperature and humidity, conventional constant temperature and humidity air conditioners need to install an electric heater behind the indoor heat exchanger to reheat the air after cooling and dehumidification. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a constant temperature and humidity air conditioner, which can effectively solve the above problems.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a constant temperature and humidity air conditioner, including an indoor unit and an outdoor air heat exchanger;

[0007] The indoor unit includes a cavity, a compressor, a four-way reversing valve, a heat storage device, an indoor air heat exchanger, and a fan. The indoor air heat exchanger and the fan are both arranged in the cavity. An air inlet is arranged on the side wall of the cavity, an air outlet is arranged on the top of the cavity, and the fan outlet extends to the air outlet.

[0008] The compressor inlet and outlet are communicated with the first end and the second end of the four-way reversing valve respectively, the third end of the four-way reversing valve is communicated with the first end of the high-temperature side of the heat storage device, the second end of the high-temperature side of the heat storage device is communicated with the first end of the indoor air heat exchanger, the second end of the indoor air heat exchanger is communicated with the first end of the first electronic expansion valve, the second end of the first electronic expansion valve is communicated with the first end of the outdoor air heat exchanger, the second end of the outdoor air heat exchanger is communicated with the first end of the second electronic expansion valve, the second end of the second electronic expansion valve is simultaneously communicated with the first end of the low-temperature side of the heat storage device and the first end of the second valve, the second end of the low-temperature side of the heat storage device and the second end of the second valve are simultaneously communicated with the fourth end of the four-way reversing valve, and a third valve is provided at the first end of the low-temperature side of the heat storage device.

[0009] Preferably, the air conditioner also includes an indoor air reheat heat exchanger, which is arranged in the cavity, the first end of the indoor air reheat heat exchanger is connected to the second end of the first electronic expansion valve, the second end of the indoor air reheat heat exchanger is connected to the first end of the second electronic expansion valve, and a first valve is provided at the second end of the indoor air reheat heat exchanger.

[0010] Preferably, the air conditioner further includes an electric humidifier, which is disposed in the cavity.

[0011] Preferably, the air conditioner further comprises an electric heater, and the electric heater is disposed in the cavity.

[0012] Preferably, the indoor air heat exchanger, the electric humidifier, the indoor air reheat heat exchanger, the electric heater, and the fan are arranged in sequence in the direction from the air inlet to the air outlet in the cavity.

[0013] Preferably, the first valve, the second valve and the third valve are all solenoid valves.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model provides a constant temperature and humidity air conditioner, which is equipped with a heat storage device on the basis of a conventional constant temperature and humidity air conditioner unit. When the heat storage device is operated under heating conditions, the heat storage device in the room can be heated at the same time, so that the heat storage device stores a certain amount of heat. When the outdoor air heat exchanger is seriously frosted and needs to be defrosted, the heat in the heat storage device can be used for defrosting by controlling the electronic expansion valve, the second valve, etc., to avoid reverse circulation directly taking heat from the indoor air. At the same time, the indoor unit can continue to maintain the heating state, reduce the fluctuation of indoor air temperature during defrosting, reduce defrosting time and energy consumption, and help to more accurately control the indoor temperature and humidity.

[0016] 2. The utility model provides a constant temperature and humidity air conditioner, which is equipped with an indoor air reheating heat exchanger on the basis of a conventional constant temperature and humidity air conditioner unit. When the air needs to be reheated after cooling and dehumidification in summer during cooling operation, the condensation heat can be recycled by controlling the valve of the indoor air reheating heat exchanger to reheat the supercooled air after cooling and dehumidification to reach the set air supply state point. In this way, the energy consumption of electric reheating of indoor air after dehumidification can be greatly reduced while ensuring accurate control of indoor temperature and humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A side structural schematic diagram of a constant temperature and humidity air conditioner provided by an embodiment of the utility model;

[0018] Figure 2 A schematic diagram of a process flow of a constant temperature and humidity air conditioner in winter heating operation provided by an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of a process flow of a constant temperature and humidity air conditioner in winter defrosting operation provided by an embodiment of the utility model;

[0020] Figure 4 A schematic flow chart of a summer cooling condition of a constant temperature and humidity air conditioner provided in an embodiment of the utility model.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Compressor; 2. Four-way reversing valve; 3. Heat storage device; 4. Indoor air heat exchanger; 5. Outdoor air heat exchanger; 6. Indoor air reheat heat exchanger; 7. First electronic expansion valve; 8. Second electronic expansion valve; 9. First valve; 10. Second valve; 11. Third valve; 12. Cavity; 13. Fan; 14. Electric heater; 15. Electric humidifier. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0024] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrally formed structure. For ordinary technicians in this field, the specific meanings of such terms in this patent can be understood according to specific circumstances.

[0025] like Figure 1-4 As shown, this embodiment provides a constant temperature and humidity air conditioner, including an indoor unit and an outdoor air heat exchanger 5;

[0026] The indoor unit includes a cavity 12, a compressor 1, a four-way reversing valve 2, a heat storage device 3, an indoor air heat exchanger 4, and a fan 13. The indoor air heat exchanger 4 and the fan 13 are both arranged in the cavity 12. An air inlet is arranged on the side wall of the cavity 12, and an air outlet is arranged on the top of the cavity 12. The outlet of the fan 13 extends to the air outlet.

[0027] The inlet and outlet of the compressor 1 are respectively connected to the first end and the second end of the four-way reversing valve 2 through a refrigerant pipe, the third end of the four-way reversing valve 2 is connected to the first end of the high temperature side of the heat storage device 3 through a refrigerant pipe, the second end of the high temperature side of the heat storage device 3 is connected to the first end of the indoor air heat exchanger 4 through a refrigerant pipe, the second end of the indoor air heat exchanger 4 is connected to the first end of the first electronic expansion valve 7 through a refrigerant pipe, the second end of the first electronic expansion valve 7 is connected to the first end of the outdoor air heat exchanger 5 through a refrigerant pipe, the second end of the outdoor air heat exchanger 5 is connected to the first end of the second electronic expansion valve 8 through a refrigerant pipe, the second end of the second electronic expansion valve 8 is simultaneously connected to the first end of the low temperature side of the heat storage device 3 and the first end of the second valve 10 through a refrigerant pipe, the second end of the low temperature side of the heat storage device 3 and the second end of the second valve 10 are simultaneously connected to the fourth end of the four-way reversing valve 2 through a refrigerant pipe, that is, the second valve 10 is connected in parallel with the low temperature side of the heat storage device 3, and a third valve 11 is provided at the first end of the low temperature side of the heat storage device 3.

[0028] Based on the above structure, by switching the internal connecting path of the four-way reversing valve 2, the flow channel and flow direction of the refrigerant can be changed, thereby converting the functions of the indoor and outdoor units of the air-conditioning system in winter and summer: in summer, the refrigerant evaporates and absorbs heat to become gas in the indoor air heat exchanger 4 (the evaporator at this time), and releases heat in the outdoor air heat exchanger 5 (the condenser at this time) for indoor cooling; in winter, the refrigerant evaporates and absorbs external heat in the outdoor air heat exchanger 5 (the evaporator at this time), and releases heat in the indoor air heat exchanger 4 (the condenser at this time) for indoor heating.

[0029] The specific working conditions are as follows.

[0030] 1) Winter heating conditions

[0031] During conventional heating in winter, the second valve 10 is opened, the third valve 11 remains closed, the second electronic expansion valve 8 remains fully open, and the first electronic expansion valve 7 throttles the refrigerant.

[0032] When the heating mode is in operation, the compressor 1 discharges high-temperature and high-pressure refrigerant gas from its outlet. For ease of understanding, Figure 2As shown, the high-temperature and high-pressure refrigerant gas flows in the direction indicated by the arrow in the figure, that is, the high-temperature and high-pressure refrigerant gas successively enters the high-temperature side of the heat storage device 3 and the indoor air heat exchanger 4 to condense and release heat, and then passes through the first electronic expansion valve 7 for throttling. After throttling, it evaporates and absorbs heat in the outdoor air heat exchanger 5, and finally enters the compressor 1 to form a heating cycle. During this process, the heat storage device 3 can store heat.

[0033] The indoor air enters the cavity 12 from the air inlet on the side wall of the cavity 12, is heated when passing through the indoor air heat exchanger 4, and is finally sent back to the room through the air outlet by the fan 13.

[0034] 2) Winter defrosting conditions

[0035] After the above heating condition has been running for a period of time, if the outdoor air heat exchanger 5 is frosted, the heat exchange efficiency will be reduced. At this time, the heat storage device 3 stores a certain amount of heat. The four-way reversing valve 2 can be switched, such as Figure 3 As shown, the high temperature and high pressure refrigerant gas is Figure 3 The middle arrow indicates the direction of flow, thereby starting the defrost condition, the third valve 11 is opened, the second valve 10 remains closed, the first electronic expansion valve 7 remains fully open, and the second electronic expansion valve 8 throttles the refrigerant. At this time, the indoor air heat exchanger 4 can continue to work.

[0036] When the defrost condition is in operation, the high-temperature and high-pressure refrigerant gas is discharged from the outlet of the compressor 1, first passes through the high-temperature side of the heat storage device 3, and then enters the indoor air heat exchanger 4 and the outdoor air heat exchanger 5 in sequence for condensation and heat release, and then passes through the second electronic expansion valve 8 for throttling, flows through the low-temperature side of the heat storage device 3 after throttling and cooling, evaporates and absorbs heat in the heat storage device 3, and finally enters the compressor 1, forming a defrost cycle.

[0037] In this way, when the outdoor air heat exchanger 5 is severely frosted and needs to be defrosted, the heat in the heat storage device 3 can be preferentially utilized by controlling the electronic expansion valve, the second valve, etc., to avoid reverse circulation directly taking heat from the indoor air. At the same time, the indoor air heat exchanger 4 can continue to maintain the heating state, reducing the fluctuation of indoor air temperature during defrosting, reducing defrosting time and energy consumption, and facilitating more accurate control of indoor temperature and humidity.

[0038] In this embodiment, the air conditioner also includes an indoor air reheat heat exchanger 6, which is arranged in the cavity 12, and the first end of the indoor air reheat heat exchanger 6 is connected to the second end of the first electronic expansion valve 7, and the second end of the indoor air reheat heat exchanger 6 is connected to the first end of the second electronic expansion valve 8. That is to say, the indoor air reheat heat exchanger 6 is connected in parallel with the outdoor air heat exchanger 5, and a first valve 9 is provided at the second end of the indoor air reheat heat exchanger 6.

[0039] In the summer cooling condition, the indoor air reheat heat exchanger 6 can recycle the condensation heat and use it to reheat the supercooled air after cooling and dehumidification to reach the set air supply state point. In this way, while ensuring accurate control of indoor temperature and humidity, the energy consumption of electric reheating of indoor air after dehumidification can be greatly reduced.

[0040] 3) Summer cooling conditions

[0041] When the cooling condition is in operation, Figure 4 As shown, the heat storage device 3 stops working, the first valve 9 and the second valve 10 are opened, the third valve 11 remains closed, the second electronic expansion valve 8 remains fully open, and the first electronic expansion valve 7 throttles the refrigerant. At this time, the four-way reversing valve 2 can be switched so that the high-temperature and high-pressure refrigerant gas flows according to Figure 4 The arrows indicate the direction of flow.

[0042] The compressor 1 discharges high-temperature and high-pressure refrigerant gas, which passes through the second valve 10 and the second electronic expansion valve 8 in sequence, and then partly enters the outdoor air heat exchanger 5 to condense and release heat, and partly enters the indoor air reheat heat exchanger 6 to condense and release heat. After heat release, it is throttled by the first electronic expansion valve 7, and finally evaporates and absorbs heat in the indoor air heat exchanger 4 before entering the compressor 1, forming a cooling cycle.

[0043] At this time, the indoor air enters the cavity 12 from the air inlet on the side wall of the cavity 12, flows through the indoor air heat exchanger 4 to be cooled and dehumidified, then flows through the indoor air reheat heat exchanger 6 to be heated to the air supply state point, and is finally sent back to the room by the fan 13 through the air outlet.

[0044] In this embodiment, the air conditioner further includes an electric humidifier 15, which is disposed in the cavity 12. In winter heating conditions, the electric humidifier 15 can fine-tune the humidity of the air supply. Specifically, after the indoor air enters the cavity 12 from the air inlet on the side wall of the cavity 12, it can be humidified when flowing through the electric humidifier 15.

[0045] In this embodiment, the air conditioner further includes an electric heater 14, which is disposed in the cavity 12. In winter heating conditions, when the indoor air heat exchanger 4 does not provide sufficient heat, the electric heater 14 can be turned on for supplementary heating. Specifically, after the indoor air enters the cavity 12 from the air inlet on the side wall of the cavity 12, it can be heated when it flows through the electric heater 14, and the air supply temperature can be finely adjusted.

[0046] In this embodiment, the indoor air heat exchanger 4, the electric humidifier 15, the indoor air reheat heat exchanger 6, the electric heater 14, and the fan 13 are arranged in sequence from the air inlet to the air outlet in the cavity 12. In this way, after the indoor air enters the cavity 12 from the air inlet on the side wall of the cavity 12, it will flow through the indoor air heat exchanger 4, the electric humidifier 15, the indoor air reheat heat exchanger 6, the electric heater 14 in sequence, and finally be sent back to the room through the air outlet by the fan 13.

[0047] In this embodiment, the first valve 9, the second valve 10, and the third valve 11 are all solenoid valves, which are conducive to automatic and precise control of the opening and closing of the valves.

[0048] The mechanisms, components and parts not specifically described in the present invention are all existing structures in the prior art and can be directly purchased from the market.

[0049] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present utility model. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0050] The above is only a preferred embodiment of the utility model, and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A constant temperature and humidity air conditioner, characterized in that: It includes an indoor unit and an outdoor air heat exchanger (5); The indoor unit comprises a cavity (12), a compressor (1), a four-way reversing valve (2), a heat storage device (3), an indoor air heat exchanger (4), and a fan (13); the indoor air heat exchanger (4) and the fan (13) are both arranged in the cavity (12); an air inlet is provided on a side wall of the cavity (12); an air outlet is provided on the top of the cavity (12); and an outlet of the fan (13) extends to the air outlet; The inlet and outlet of the compressor (1) are respectively connected to the first end and the second end of the four-way reversing valve (2); the third end of the four-way reversing valve (2) is connected to the first end of the high temperature side of the heat storage device (3); the second end of the high temperature side of the heat storage device (3) is connected to the first end of the indoor air heat exchanger (4); the second end of the indoor air heat exchanger (4) is connected to the first end of the first electronic expansion valve (7); the second end of the first electronic expansion valve (7) is connected to the first end of the outdoor air heat exchanger (5); the second end of the outdoor air heat exchanger (5) is connected to the first end of the second electronic expansion valve (8); the second end of the second electronic expansion valve (8) is simultaneously connected to the first end of the low temperature side of the heat storage device (3) and the first end of the second valve (10); the second end of the low temperature side of the heat storage device (3) and the second end of the second valve (10) are simultaneously connected to the fourth end of the four-way reversing valve (2); and a third valve (11) is provided at the first end of the low temperature side of the heat storage device (3).

2. A constant temperature and humidity air conditioner according to claim 1, characterized in that: The air conditioner further comprises an indoor air reheat heat exchanger (6), wherein the indoor air reheat heat exchanger (6) is arranged in the cavity (12), wherein the first end of the indoor air reheat heat exchanger (6) is connected to the second end of the first electronic expansion valve (7), and the second end of the indoor air reheat heat exchanger (6) is connected to the first end of the second electronic expansion valve (8), and a first valve (9) is provided at the second end of the indoor air reheat heat exchanger (6).

3. A constant temperature and humidity air conditioner according to claim 2, characterized in that: The air conditioner further comprises an electric humidifier (15), and the electric humidifier (15) is arranged in the cavity (12).

4. A constant temperature and humidity air conditioner according to claim 3, characterized in that: The air conditioner further comprises an electric heater (14), wherein the electric heater (14) is arranged in the cavity (12).

5. A constant temperature and humidity air conditioner according to claim 4, characterized in that: The indoor air heat exchanger (4), the electric humidifier (15), the indoor air reheat heat exchanger (6), the electric heater (14), and the fan (13) are arranged in sequence in the cavity (12) along the direction from the air inlet to the air outlet.

6. A constant temperature and humidity air conditioner according to claim 5, characterized in that: The first valve (9), the second valve (10) and the third valve (11) are all solenoid valves.

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