Low power consumption constant temperature and humidity machine and working method thereof

Abstract

The present invention relates to a low-power constant temperature and humidity machine and a working method thereof, comprising an indoor unit and an outdoor heat dissipation unit, wherein the indoor unit is provided with a refrigeration and dehumidification unit and at least two indoor condensers, wherein the refrigeration and dehumidification unit comprises a liquid storage tank, an expansion valve, an indoor evaporator and a compressor which are sequentially connected in series along the flow direction of the refrigerant; the outdoor heat dissipation unit is connected to the refrigeration and dehumidification unit through a pipeline to form an external circulation loop; and each indoor condenser is connected to the refrigeration and dehumidification unit through a pipeline to form an internal circulation loop. The low-power constant temperature and humidity machine is suitable for low-load or zero-load environments, and a circulation loop capable of realizing heat recovery is added, and the required temperature and humidity are obtained by repeatedly running by discharging the excess heat source to the outdoors or recovering it, without the need for additional electric auxiliary heating, thereby reducing heat energy loss and operating costs.

Description

Technical Field

[0001] The invention relates to a low-power consumption constant temperature and humidity machine and a working method thereof. Background Art

[0002] Low-load or zero-load environments refer to environments where there are almost no electronic equipment that can generate heat, that is, there is no heat source that can cause the indoor temperature to rise, or even if there is, it has little effect, such as conference rooms, vaults, special medicines, special computer rooms, libraries, etc. Constant temperature and humidity machines use the refrigeration and dehumidification function to reduce the temperature of the environment to the set temperature and dehumidify. When working in a low-load or zero-load environment, if the indoor environment is required to have a temperature of 10-22°C and a humidity of 35%-50%, it is difficult to achieve low humidity control using conventional constant temperature and humidity machines, and electric auxiliary heating needs to be started, thereby increasing power consumption; if the heat of the electric auxiliary heating cannot meet the cooling capacity of the dehumidification, it is necessary to repeatedly stop the machine for heating and dehumidification, resulting in the inability to control the temperature and humidity within the specified temperature and humidity range. . Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a low-power constant temperature and humidity machine and a working method thereof, which saves power consumption, reduces heat energy loss and operating costs, and is suitable for low-load or zero-load environments.

[0004] The present invention is implemented by the following scheme: a low-power constant temperature and humidity machine, characterized in that it includes an indoor unit and an outdoor heat dissipation unit, the indoor unit is provided with a refrigeration and dehumidification unit and at least two indoor condensers, the refrigeration and dehumidification unit includes a liquid storage tank, an expansion valve, an indoor evaporator and a compressor which are sequentially connected in series along the flow direction of the refrigerant; the outdoor heat dissipation unit is connected to the refrigeration and dehumidification unit through a pipeline to form an external circulation loop; each indoor condenser is connected to the refrigeration and dehumidification unit through a pipeline to form an internal circulation loop.

[0005] Furthermore, it also includes at least two reversing four-way valves corresponding one-to-one to the indoor condensers for switching the circulation circuit. The refrigerant outlet end of the refrigeration and dehumidification unit is connected to the D interface of each reversing four-way valve through the refrigerant diversion pipe, the E interface of each reversing four-way valve is connected to the inlet end of the corresponding indoor condenser, and the outlet end of each indoor condenser is respectively connected to the refrigerant inlet end of the refrigeration and dehumidification unit; the C interface of each reversing four-way valve is connected to the inlet end of the outdoor heat dissipation unit, and the outlet end of the outdoor heat dissipation unit is connected to the refrigerant inlet end of the refrigeration and dehumidification unit.

[0006] Furthermore, a pressure relief pipeline is respectively connected between the connecting pipeline between the indoor evaporator and the compressor in the refrigeration and dehumidification unit and the S interface of each reversing four-way valve, and a one-way valve A is installed on the pressure relief pipeline; a one-way valve is installed on the connecting pipeline between each indoor condenser and the outdoor heat dissipation unit and the refrigeration and dehumidification unit.

[0007] Furthermore, the outdoor heat dissipation unit adopts an outdoor condenser.

[0008] Furthermore, the outdoor heat dissipation unit includes a water-fluorine heat exchanger and a dry cooler, and a heat dissipation circulation pump is installed on the connecting pipeline between the dry cooler and the water-fluorine heat exchanger.

[0009] Furthermore, an air inlet is provided on the lower side of the indoor unit, an air outlet is provided on the upper side of the indoor unit, an air supply fan is installed on the top of the indoor unit, all indoor condensers and indoor evaporators are installed in the middle of the indoor unit and are inclined in the same direction, all indoor condensers are located above the indoor evaporator, a water collecting pan is installed below the lower end of the indoor evaporator, and a plasma generator or an ultraviolet lamp is installed above the indoor condenser.

[0010] Furthermore, the refrigeration and dehumidification unit also includes an oil separator connected to the outlet end of the compressor, a drying filter, a solenoid valve and a sight glass are connected in series on the connecting pipe between the liquid storage tank and the expansion valve, and a shock-absorbing corrugated hose is connected in series on the connecting pipe between the indoor evaporator and the compressor.

[0011] Another technical solution of the present invention is a working method of a low-power constant temperature and humidity machine as described above: (1) when it is necessary to reduce the ambient temperature and humidity to a set value, some of the reversing four-way valves switch the corresponding indoor condenser to be connected to the refrigeration and dehumidification unit, and the remaining reversing four-way valves switch the outdoor heat dissipation unit to be connected to the refrigeration and dehumidification unit, the external circulation loop and part of the internal circulation loop intervene to work, and the constant temperature and humidity machine first enters the refrigeration and dehumidification state; (2) when the temperature reaches the set temperature but the humidity has not reached the set value, all the reversing four-way valves switch the corresponding indoor condenser to be connected to the refrigeration and dehumidification unit, all the circulation loops intervene to work, and the constant temperature and humidity machine switches to the dehumidification and heating state; (3) when the temperature is higher than the set temperature but the humidity has not reached the set value, some of the reversing four-way valves switch the corresponding indoor condenser to be connected to the refrigeration and dehumidification unit, the remaining reversing four-way valves switch the outdoor heat dissipation unit to be connected to the refrigeration and dehumidification unit, the external circulation loop and part of the internal circulation loop intervene to work, and the constant temperature and humidity machine switches back to the refrigeration and dehumidification state; through steps (1) to (3), the switching operation is repeated until the indoor temperature and humidity are reduced to the set value.

[0012] Compared with the prior art, the present invention has the following beneficial effects: the low-power constant temperature and humidity machine of the present invention is suitable for low-load or zero-load environments. By adding two indoor condensers in the indoor unit, a first internal circulation loop and a second internal circulation loop that can realize heat recovery are added. By discharging excess heat source to the outdoors or recovering it, the required temperature and humidity can be obtained by repeated operation without the need for additional electric auxiliary heating, thereby saving power consumption, reducing heat energy loss and operating costs.

[0013] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of a first embodiment of the present invention;

[0015] Figure 2 is a side view of the internal structure of an indoor unit according to a first embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of a cooling state of Embodiment 1 of the present invention;

[0017] Figure 4 This is a schematic diagram of the cooling and dehumidification state of the first embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the dehumidification and heating state of the first embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of the second embodiment of the present invention;

[0020] Figure 7 is a side view of the internal structure of the indoor unit of Embodiment 2 of the present invention;

[0021] Explanation of the numbers in the figure: 100 - indoor unit, 110 - first indoor condenser, 120 - second indoor condenser, 130 - oil separator, 140 - indoor evaporator, 141 - water tray, 150 - compressor, 160 - water-fluorine heat exchanger, 170 - cooling circulation pump, 180 - air supply fan, 190 - plasma generator. DETAILED DESCRIPTION

[0022] Embodiment 1: Figures 1 to 5As shown, a low-power constant temperature and humidity machine includes an indoor unit 100 and an outdoor heat dissipation unit. The indoor unit 100 is provided with two indoor condensers (respectively a first indoor condenser 110 and a second indoor condenser 120) and a refrigeration and dehumidification unit. The refrigeration and dehumidification unit includes a liquid storage tank 130, an expansion valve, an indoor evaporator 140 and a compressor 150 which are sequentially connected in series along the flow direction of the refrigerant. The expansion valve is a thermal expansion valve, and an electronic expansion valve can also be used in the specific implementation process; the outdoor heat dissipation unit is connected to the refrigeration and dehumidification unit through a pipeline to form an external circulation loop, and each indoor condenser is connected to the refrigeration and dehumidification unit through a pipeline to form an internal circulation loop; wherein the first indoor condenser is connected to the refrigeration and dehumidification unit through a pipeline to form a first internal circulation loop; the second indoor condenser is connected to the refrigeration and dehumidification unit through a pipeline to form a first internal circulation loop; The condenser is connected with the refrigeration and dehumidification unit through a pipeline to form a second internal circulation loop; the present invention will add two indoor condensers in the indoor unit, thereby adding a first internal circulation loop and a second internal circulation loop that can realize heat recovery. According to the temperature and humidity conditions in the room, it can be selected whether to enable the first internal circulation loop or the second internal circulation loop to recover heat to improve the dehumidification efficiency. By discharging the excess heat source to the outdoors or recovering it, the required temperature and humidity can be obtained by repeated operation without the need for additional electric auxiliary heating. The heat source in the environment is recovered, and the humidity in the environment is extracted from the air and discharged to the outdoors, thereby saving power consumption, reducing heat energy loss, and reducing operating costs. In addition, by allocating the ratio of the heat exchange area of ​​the two indoor condensers, the temperature can be controlled to a lower level in the refrigeration and dehumidification state.

[0023] In this embodiment, the outdoor heat dissipation unit is an outdoor condenser.

[0024] In the present embodiment, two reversing four-way valves corresponding to the two indoor condensers for switching the circulation circuit are also included, which are a first reversing four-way valve corresponding to the first indoor condenser and a second reversing four-way valve corresponding to the second indoor condenser. The refrigerant outlet end of the refrigeration and dehumidification unit is connected to the D interfaces of the two reversing four-way valves through two refrigerant shunt pipes, respectively. The inlet end of the first indoor condenser is connected to the E interface of the first reversing four-way valve, and the outlet end of the first indoor condenser is connected to the refrigerant inlet end (that is, the liquid storage tank) of the refrigeration and dehumidification unit; the inlet end of the second indoor condenser is connected to the E interface of the second reversing four-way valve, and the outlet end of the second indoor condenser is connected to the refrigerant inlet end (that is, the liquid storage tank) of the refrigeration and dehumidification unit; the C interfaces of the first reversing four-way valve and the second reversing four-way valve are both connected to the inlet end of the outdoor heat dissipation unit, and the outlet end of the outdoor heat dissipation unit is connected to the refrigerant inlet end (that is, the liquid storage tank) of the refrigeration and dehumidification unit. The switching between the three circulation loops is realized by two reversing four-way valves; the compression pump divides the refrigerant into two parts, one part goes to the first reversing four-way valve, and the other part goes to the second reversing four-way valve; when the D interface of the first reversing four-way valve and the second reversing four-way valve are connected to the C interface, the two parts of the refrigerant all enter the outdoor cooling unit, and only the external circulation loop participates in the work. At this time, it is in the cooling state, such as Figure 3 As shown; when the D interface of the first reversing four-way valve is connected to the E interface, and the D interface of the second reversing four-way valve is connected to the C interface, a part of the refrigerant enters the first indoor condenser, and the other part of the refrigerant enters the outdoor heat dissipation unit. The external circulation loop and the first internal circulation loop participate in the work at the same time. At this time, it is in the refrigeration and dehumidification state, as shown in FIG. Figure 4 As shown; when the D interface of the first reversing four-way valve is connected to the E interface, and the D interface of the second reversing four-way valve is also connected to the E interface, a part of the refrigerant enters the first indoor condenser, and the other part of the refrigerant enters the second indoor condenser, and the first internal circulation loop and the second internal circulation loop participate in the work at the same time, and it is in the dehumidification and heating state.

[0025] The low-power constant temperature and humidity machine of the present invention works as follows: when the low-power constant temperature and humidity machine is in a low-load or zero-load environment, the temperature is 30°C and the humidity is 80%. When the ambient temperature and humidity need to be controlled at 20°C and 50%, the constant temperature and humidity machine first enters the refrigeration and dehumidification state. Figure 4 As shown, part of the heat is recovered into the room to increase the temperature, while the other part is used to cool down the room, so that the low-temperature cold air is heated by part of the hot air and then sent to the environment; when the temperature reaches the set temperature (20ºC), the constant temperature and humidity machine switches to the dehumidification and heating state, as shown in the figure. Figure 5 As shown, all the heat is recovered to the room to increase the temperature and improve the dehumidification efficiency; when the temperature is higher than the set temperature (20ºC), the constant temperature and humidity machine switches to the cooling and dehumidification state again, as shown in Figure 4As shown, part of the heat is recovered into the room to increase the temperature, while the other part is used to cool it down, so that the low-temperature cold air is heated by a part of the hot air and then sent to the environment. This cycle is repeated to reduce the indoor humidity to the set humidity.

[0026] In this embodiment, a pressure relief pipeline is connected between the connecting pipeline between the indoor evaporator and the compressor in the refrigeration and dehumidification unit and the S interface of the first reversing four-way valve and the second reversing four-way valve, so that the reversing four-way valve can switch the indoor and outdoor condensers and return the operating refrigerant in the unactivated condenser to low pressure through the pressure relief pipeline; a one-way valve A is installed on the pressure relief pipeline, which is respectively Figure 1 The one-way valve A1 and one-way valve A2 in the first indoor condenser, the second indoor condenser, and the connecting pipes between the outdoor heat dissipation unit and the refrigeration and dehumidification unit are all installed with one-way valves, respectively. Figure 1 The one-way valve 1, one-way valve 2 and one-way valve 3 in the reversing four-way valve are connected; when the D interface and the C interface of the reversing four-way valve are connected, the S interface and the E interface are connected; when the D interface and the E interface are connected, the S interface and the C interface are connected; in this way, each time the reversing four-way valve is switched, the refrigerant in the original condenser will be switched through the reversing four-way valve and returned to the low-pressure side of the compressor through the pressure relief pipeline, and the refrigerant will not be accumulated in the condenser that is not working. Each time the reversing four-way valve is switched, the compressor is switched to low-load operation to ensure the good operation state of the compressor; at the same time, the outdoor condenser is equipped with a constant pressure stepless speed regulation module, which can ensure the high pressure under low load of the outdoor condenser.

[0027] In this embodiment, an air inlet is provided on the lower side of the indoor unit, an air filter is installed at the air inlet, an air outlet is provided on the upper side of the indoor unit, an air supply fan 180 is installed on the top of the indoor unit, the first indoor condenser, the second indoor condenser and the indoor evaporator are installed in the middle of the indoor unit and are all inclined in the same direction, the first indoor condenser and the second indoor condenser are located above the indoor evaporator, and a water receiving pan 141 is installed below the lower end of the indoor evaporator; in the specific implementation process, the air supply fan 180 in this embodiment can adopt an EC air supply fan, and when the set temperature and humidity are reached, the air volume is reduced to save electric energy.

[0028] In this embodiment, a plasma generator 190 is installed above the first indoor condenser and the second indoor condenser, which has a mildew removal and sterilization effect, and an ultraviolet lamp can also be used.

[0029] In this embodiment, the refrigeration and dehumidification unit also includes an oil separator 130 connected to the outlet end of the compressor. The oil separator serves as the refrigerant outlet end of the refrigeration and dehumidification unit. The two reversing four-way valves are connected to the oil separator through the refrigerant shunt pipe. When the oil separator 130 is not set, the compressor serves as the refrigerant outlet end of the refrigeration and dehumidification unit and is connected to the refrigerant shunt pipe and the reversing four-way valve; a drying filter, a solenoid valve and a sight glass are connected in series on the connecting pipe between the liquid storage tank and the expansion valve, and a shock-absorbing corrugated hose is connected in series on the connecting pipe between the indoor evaporator and the compressor. The compressor is installed on a base plate below it, and a shock-absorbing spring supporting the base plate is installed below the base plate.

[0030] A method for operating a low-power constant temperature and humidity machine as described above, wherein: (1) when the ambient temperature and humidity need to be lowered to a set value, two reversing four-way valves switch the first indoor condenser and the outdoor condenser to be connected to a refrigeration and dehumidification unit, i.e., the D interface and the E interface of the first reversing four-way valve are connected, and the D interface and the C interface of the second reversing four-way valve are connected, and the external circulation loop and the first internal circulation loop intervene to work, and the constant temperature and humidity machine first enters a refrigeration and dehumidification state; (2) when the temperature reaches the set temperature but the humidity has not yet reached the set value, the two reversing four-way valves switch the first indoor condenser and the second indoor condenser to be connected to the refrigeration and dehumidification unit, i.e., the D interface and the E interface of the first reversing four-way valve are connected. The D interface of the second reversing four-way valve is also connected to the E interface, the first internal circulation loop and the second internal circulation loop intervene to work, and the constant temperature and humidity machine switches to the dehumidification and heating state; (3) when the temperature is higher than the set temperature and the humidity has not reached the set value, the two reversing four-way valves switch the first indoor condenser and the outdoor condenser to connect with the refrigeration and dehumidification unit, that is, the D interface of the first reversing four-way valve is connected to the E interface, and the D interface of the second reversing four-way valve is connected to the C interface, the external circulation loop and the first internal circulation loop intervene to work, and the constant temperature and humidity machine switches back to the refrigeration and dehumidification state; through steps (1) to (3), the switching operation is repeated until the indoor temperature and humidity are reduced to the set values.

[0031] Embodiment 2: Figure 6-7 As shown, the difference between this embodiment and the first embodiment is that the structure of the outdoor heat dissipation unit is different. The outdoor heat dissipation unit in this embodiment includes a water-fluorine heat exchanger 160 and a dry cooler. A heat dissipation circulation pump 170 is installed on the connecting pipe between the dry cooler and the water-fluorine heat exchanger. The outdoor heat dissipation unit in the first embodiment directly uses an outdoor condenser, which is based on the principle of direct evaporation and is called type A; while this embodiment uses indirect heat exchange, which is used in the case where the installation position of the outdoor unit is limited, and uses a water\ethylene glycol mixed liquid for conversion to achieve long-distance heat dissipation of the outdoor unit, which is called type G, and solves the problem that the refrigerant is not easy to return to the compressor and the load of the compressor due to the long pipeline when the condenser (i.e. type A) is directly used.

[0032] A working method of a low-power constant temperature and humidity machine as described above, (1) when it is necessary to reduce the ambient temperature and humidity to a set value, two reversing four-way valves switch the first indoor condenser and the water-fluorine heat exchanger to be connected to the refrigeration and dehumidification unit, that is, the D interface and the E interface of the first reversing four-way valve are connected, and the D interface and the C interface of the second reversing four-way valve are connected, and the external circulation loop and the first internal circulation loop intervene to work, and the constant temperature and humidity machine first enters the refrigeration and dehumidification state; (2) when the temperature reaches the set temperature but the humidity has not yet reached the set value, the two reversing four-way valves switch the first indoor condenser and the second indoor condenser to be connected to the refrigeration and dehumidification unit, that is, the D interface and the E interface of the first reversing four-way valve are connected. The D interface of the second reversing four-way valve is also connected to the E interface, the first internal circulation loop and the second internal circulation loop intervene to work, and the constant temperature and humidity machine switches to the dehumidification and heating state; (3) When the temperature is higher than the set temperature and the humidity has not reached the set value, the two reversing four-way valves switch the first indoor condenser and the water-fluorine heat exchanger to connect with the refrigeration and dehumidification unit, that is, the D interface of the first reversing four-way valve is connected to the E interface, and the D interface of the second reversing four-way valve is connected to the C interface, the external circulation loop and the first internal circulation loop intervene to work, and the constant temperature and humidity machine switches back to the refrigeration and dehumidification state; through steps (1) to (3), the switching operation is repeated until the indoor temperature and humidity are reduced to the set values.

[0033] Embodiment 3: The difference between this embodiment and embodiment 1 is that the number of indoor condensers and reversing four-way valves is different. In this embodiment, the number of indoor condensers and reversing four-way valves is the same and greater than two, which can be 3, 4, 5, 6...; the connection method of all indoor condensers is the same as the connection method of the first indoor condenser or the second indoor condenser in embodiment 1, and each indoor condenser is equipped with a reversing four-way valve; the refrigerant outlet end of the refrigeration and dehumidification unit is respectively connected to the D interface of each reversing four-way valve through the refrigerant shunt pipe, the E interface of each reversing four-way valve is connected to the inlet end of the corresponding indoor condenser, the outlet end of each indoor condenser is respectively connected to the refrigerant inlet end of the refrigeration and dehumidification unit, and each indoor condenser and the refrigeration and dehumidification unit are respectively connected through pipelines to form an internal circulation loop; the C interface of each reversing four-way valve is connected to the inlet end of the outdoor heat dissipation unit, and the outlet end of the outdoor heat dissipation unit is connected to the refrigerant inlet end of the refrigeration and dehumidification unit; compared with embodiment 1, this embodiment increases the number of indoor condensers, which can improve the control accuracy to control the fluctuation range of the temperature and humidity curve.

[0034] In this embodiment, a pressure relief pipeline is respectively connected between the connecting pipeline between the indoor evaporator and the compressor in the refrigeration and dehumidification unit and the S interface of each reversing four-way valve, and a one-way valve A is installed on the pressure relief pipeline; a one-way valve is installed on the connecting pipeline between each indoor condenser and the outdoor heat dissipation unit and the refrigeration and dehumidification unit.

[0035] A method for operating a low-power constant temperature and humidity machine as described above: (1) when it is necessary to reduce the ambient temperature and humidity to a set value, part (at least one) of the reversing four-way valves switches the corresponding indoor condenser to be connected to a refrigeration and dehumidification unit, and the remaining reversing four-way valves switches the outdoor heat dissipation unit to be connected to the refrigeration and dehumidification unit, the external circulation loop and part of the internal circulation loop intervene to work, and the constant temperature and humidity machine first enters the refrigeration and dehumidification state; (2) when the temperature reaches the set temperature but the humidity has not yet reached the set value, all the reversing four-way valves switch the corresponding indoor condenser to be connected to the refrigeration and dehumidification unit, all the circulation loops intervene to work, and the constant temperature and humidity machine switches to the dehumidification and heating state; (3) when the temperature is higher than the set temperature but the humidity has not yet reached the set value, part of the reversing four-way valves switches the corresponding indoor condenser to be connected to the refrigeration and dehumidification unit, the remaining reversing four-way valves switch the outdoor heat dissipation unit to be connected to the refrigeration and dehumidification unit, the external circulation loop and part of the internal circulation loop intervene to work, and the constant temperature and humidity machine switches back to the refrigeration and dehumidification state; through steps (1) to (3), the switching operation is repeated until the indoor temperature and humidity are reduced to the set value.

[0036] When the constant temperature and humidity machine in step (1) and step (3) is in the cooling and dehumidification state, the number of indoor condensers that are specifically involved in the work is controlled and allocated by the control system according to the current temperature and humidity conditions. By increasing the number of indoor condensers, the control accuracy can be improved to control the fluctuation range of the temperature and humidity curve.

[0037] Unless otherwise stated, any technical solution disclosed in the present invention disclosed above, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the present invention discloses some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the present invention.

[0038] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integrated molding using a casting process) (except when it is obviously impossible to use an integrated molding process).

[0039] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0040] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A low-power constant temperature and humidity machine, characterized in that: The invention comprises an indoor unit and an outdoor heat dissipation unit, wherein the indoor unit is provided with a refrigeration and dehumidification unit and at least two indoor condensers, wherein the refrigeration and dehumidification unit comprises a liquid storage tank, an expansion valve, an indoor evaporator and a compressor which are sequentially connected in series along the flow direction of the refrigerant; the outdoor heat dissipation unit and the refrigeration and dehumidification unit are connected through pipelines to form an external circulation loop; each indoor condenser is connected to the refrigeration and dehumidification unit through pipelines to form an internal circulation loop; the invention also comprises at least two reversing four-way valves corresponding to the indoor condensers for switching the circulation loop, the refrigerant outlet end of the refrigeration and dehumidification unit is respectively connected to the D interface of each reversing four-way valve through a refrigerant shunt pipe, the E interface of each reversing four-way valve is connected to the inlet end of the corresponding indoor condenser, and the outlet end of each indoor condenser is respectively connected to the refrigerant inlet end of the refrigeration and dehumidification unit; the C interface of each reversing four-way valve is connected to the inlet end of the outdoor heat dissipation unit, and the outlet end of the outdoor heat dissipation unit is connected to the refrigerant inlet end of the refrigeration and dehumidification unit; the refrigeration A pressure relief pipeline is respectively connected between the connecting pipeline between the indoor evaporator and the compressor in the dehumidification unit and the S interface of each reversing four-way valve, and a one-way valve A is installed on the pressure relief pipeline; a one-way valve is installed on each indoor condenser and the connecting pipeline between the outdoor heat dissipation unit and the refrigeration and dehumidification unit; an air inlet is arranged on the lower side of the indoor unit, an air outlet is arranged on the upper side of the indoor unit, an air supply fan is installed on the top of the indoor unit, all indoor condensers and indoor evaporators are installed in the middle of the indoor unit and are inclined in the same direction, all indoor condensers are located above the indoor evaporator, a water receiving pan is installed below the lower end of the indoor evaporator, and a plasma generator or an ultraviolet lamp is installed above the indoor condenser; the refrigeration and dehumidification unit also includes an oil separator connected to the outlet end of the compressor, a drying filter, a solenoid valve and a sight glass are connected in series on the connecting pipeline between the liquid storage tank and the expansion valve, and a shock-absorbing corrugated hose is connected in series on the connecting pipeline between the indoor evaporator and the compressor.

2. The low-power constant temperature and humidity machine according to claim 1, characterized in that: The outdoor heat dissipation unit adopts an outdoor condenser.

3. The low-power constant temperature and humidity machine according to claim 1, characterized in that: The outdoor heat dissipation unit comprises a water-fluorine heat exchanger and a dry cooler, and a heat dissipation circulation pump is installed on the connecting pipeline between the dry cooler and the water-fluorine heat exchanger.

4. A method for operating the low-power constant temperature and humidity machine as claimed in claim 1, characterized in that: (1) When the ambient temperature and humidity need to be lowered to the set value, some of the reversing four-way valves are switched to connect the corresponding indoor condenser with the refrigeration and dehumidification unit, and the remaining reversing four-way valves are switched to connect the outdoor heat dissipation unit with the refrigeration and dehumidification unit. The external circulation loop and part of the internal circulation loop intervene to work, and the constant temperature and humidity machine first enters the refrigeration and dehumidification state; (2) When the temperature reaches the set temperature but the humidity has not reached the set value, all the reversing four-way valves are switched to connect the corresponding indoor condenser with the refrigeration and dehumidification unit, all the circulation loops intervene to work, and the constant temperature and humidity machine switches to the dehumidification and heating state; (3) When the temperature is higher than the set temperature but the humidity has not reached the set value, some of the reversing four-way valves are switched to connect the corresponding indoor condenser with the refrigeration and dehumidification unit, and the remaining reversing four-way valves are switched to connect the outdoor heat dissipation unit with the refrigeration and dehumidification unit. The external circulation loop and part of the internal circulation loop intervene to work, and the constant temperature and humidity machine switches back to the refrigeration and dehumidification state; Steps (1) to (3) are repeatedly switched until the indoor temperature and humidity are both lowered to the set value.

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