CN214891574U - Heat pump system and air conditioning equipment thereof - Google Patents

Abstract

The utility model provides a heat pump system and air conditioning equipment thereof relates to heat pump technical field. The heat pump system includes: an indoor unit device (100) and an outdoor unit device (200); the indoor unit device (100) comprises a compressor (01), an electromagnetic valve (8), a first indoor heat exchanger (05), a second indoor heat exchanger (06), a valve assembly (40) and a flash evaporator (11); the valve assembly (40) is used for controlling the flow direction and the on-off of the refrigerant; the second port and the third port of the flash evaporator (11) are respectively connected with an air supplement port of the compressor (01) and the second end of the outdoor unit device (200); the electromagnetic valve (8) is arranged in an air supply pipeline between the second port of the flash evaporator (11) and an air supply port of the compressor (01). The utility model discloses a heat pump system and air conditioning equipment thereof can provide stable heating capacity, enlarges heat pump system's operating range.

Description

Heat pump system and air conditioning equipment thereof

Technical Field

The utility model relates to a heat pump technology field especially relates to a heat pump system and air conditioning equipment thereof.

Background

At present, in order to improve the comfort level of the environment where people are located, a constant temperature and humidity machine can be adopted to control the temperature and the humidity in the environment, and the constant temperature and humidity machine can also be applied to places such as base stations and machine rooms with higher requirements on temperature and humidity. The constant temperature and humidity machine is a common heat pump unit, and when heating is performed in a low-temperature environment or an ultra-low-temperature environment, the heat pump system can generate the conditions of heating attenuation and insufficient heating quantity, so that the heating performance coefficient is reduced.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a heat pump system and an air conditioner thereof, which can ensure the heating capacity of the heat pump system.

According to a first aspect of the present invention, there is provided a heat pump system, comprising: an indoor unit device and an outdoor unit device; the indoor unit device includes: the system comprises a compressor, an electromagnetic valve, a first indoor heat exchanger, a second indoor heat exchanger, a valve assembly and a flash evaporator; the valve assembly is respectively connected with an exhaust port and an air suction port of the compressor, the first end of the first indoor heat exchanger and the first end of the outdoor unit device, and is used for controlling the flow direction and the on-off of a refrigerant; the first end of the second indoor heat exchanger is connected with the exhaust port of the compressor, the second end of the second indoor heat exchanger is connected with the second end of the first indoor heat exchanger to form a first connecting point, and the first connecting point is connected with the first port of the flash evaporator; the second port and the third port of the flash evaporator are respectively connected with the gas supplementing port of the compressor and the second end of the outdoor unit device; the electromagnetic valve is arranged in an air supplement pipeline between the second port of the flash evaporator and an air supplement port of the compressor.

Optionally, the outdoor unit device includes: at least two outdoor units.

Optionally, the outdoor unit device includes: a first outdoor unit and a second outdoor unit; the first outdoor unit includes: a first outdoor heat exchanger, the second outdoor unit comprising: a second outdoor heat exchanger; the valve assembly is respectively connected with the first end of the first outdoor heat exchanger and the first end of the second outdoor heat exchanger; and the second end of the first outdoor heat exchanger and the second end of the second outdoor heat exchanger are connected to form a second connecting point, and the second connecting point is connected with the third port of the flash evaporator.

Optionally, the valve assembly comprises: a first four-way valve, a second four-way valve and a third four-way valve; the first port of the first four-way valve, the first port of the second four-way valve and the first port of the third four-way valve are respectively connected with an exhaust port of the compressor; the fourth port of the first four-way valve, the fourth port of the second four-way valve and the fourth port of the third four-way valve are respectively communicated with an air suction port of the compressor; a pipeline between a fourth port of the first four-way valve and an air suction port of the compressor is connected with a second port of the first four-way valve through a first throttling device; a pipeline between a fourth port of the second four-way valve and the suction port of the compressor is connected with a second port of the second four-way valve through a second throttling device; a pipeline between a fourth port of the third four-way valve and the suction port of the compressor is connected with a second port of the third four-way valve through a third throttling device; a third port of the first four-way valve is connected with a first end of the first indoor heat exchanger; a third port of the second four-way valve is connected with a first end of the first outdoor heat exchanger; and a third port of the third four-way valve is connected with the first end of the second outdoor heat exchanger.

Optionally, the indoor unit device includes: a first stop valve and a second stop valve; the first outdoor unit includes: a third stop valve; the second outdoor unit includes: a fourth stop valve; the first stop valve and the fourth stop valve are arranged in a pipeline between a third port of the third four-way valve and a first end of the second outdoor heat exchanger; the second stop valve and the third stop valve are arranged in a pipeline between a third port of the second four-way valve and the first end of the first outdoor heat exchanger.

Optionally, the indoor unit device includes: a fifth stop valve; the first outdoor unit includes: a sixth stop valve; the second outdoor unit includes: a seventh stop valve; the fifth stop valve is arranged in a pipeline between the second connecting point and the third port of the flash evaporator; the sixth stop valve is arranged in a pipeline between the second connecting point and the second end of the first outdoor heat exchanger; the seventh stop valve is disposed in the piping between the second connection point and the second end of the second outdoor heat exchanger.

Optionally, the first outdoor unit includes: a fourth throttling device; the second outdoor unit includes: a fifth throttling device; the fourth throttling device is arranged in a pipeline between the sixth stop valve and the second end of the first outdoor heat exchanger; the fifth throttling device is arranged in a pipeline between the seventh stop valve and the second end of the second outdoor heat exchanger.

Optionally, the indoor unit device includes: a sixth throttling means and a seventh throttling means; the sixth throttling device is arranged in a pipeline between the first indoor heat exchanger and the first connecting point, and the seventh throttling device is arranged in a pipeline between the second indoor heat exchanger and the first connecting point.

Optionally, the first outdoor unit includes: a first outdoor fan system; the second outdoor unit includes: a second outdoor fan system; the first outdoor fan system and the first outdoor heat exchanger are positioned in a first air duct, and the second outdoor fan system and the second outdoor heat exchanger are positioned in a second air duct.

Optionally, the indoor unit device includes: an indoor side fan system; the indoor side fan system, the first indoor heat exchanger and the second indoor heat exchanger are located in the same air duct.

According to a second aspect of the present invention, there is provided an air conditioning apparatus, comprising: a heat pump system as described above.

The heat pump system and the air conditioning equipment thereof can ensure that the heat pump system can provide stable heating capacity, improve the heating performance, enlarge the operation range of the heat pump system and improve the operation stability; and can realize asynchronous defrosting to the off-premises station, the indoor side heat exchanger still keeps high pressure state during the defrosting, keeps indoor side heat output, and the indoor temperature that reduces during the defrosting fluctuates by a wide margin increases the suitability of off-premises station simultaneously, improves user's use sensitivity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive laboriousness.

Fig. 1 is a schematic structural view of an embodiment of a heat pump system according to the present invention;

fig. 2 is a schematic flow diagram of an embodiment of a method of controlling a heat pump system according to the present invention;

fig. 3 is a schematic structural view of another embodiment of a heat pump system according to the present invention;

fig. 4 is a schematic structural view of yet another embodiment of a heat pump system according to the present invention;

fig. 5 is a schematic flow chart of another embodiment of a control method of a heat pump system according to the present invention;

fig. 6 is a schematic diagram of a refrigerant flow path of the heat pump system in the cooling/dehumidifying mode according to the embodiment of the present invention;

fig. 7 is a schematic diagram of a refrigerant flow path of the heat pump system in the second dehumidification and reheating mode according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a refrigerant flow path of the heat pump system in the third dehumidification and reheating mode according to an embodiment of the present invention;

fig. 9 is a schematic view of a refrigerant flow path of the heat pump system in the first heating mode according to an embodiment of the present invention;

fig. 10 is a schematic view of a refrigerant flow path of the heat pump system in the second heating mode according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a refrigerant flow path of the heat pump system in the first defrosting mode according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a refrigerant flow path of the heat pump system in the second defrosting mode according to an embodiment of the present invention.

Detailed Description

The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. The technical solution of the present invention is described in many ways with reference to the drawings and the embodiments.

The terms "first" and "second" are used only for descriptive distinction and have no other special meaning.

As shown in fig. 1, the present invention provides a heat pump system including an indoor unit 100 and an outdoor unit 200. The indoor unit device 100 includes a compressor 01, a solenoid valve 8, a first indoor heat exchanger 05, a second indoor heat exchanger 06, a valve assembly 40, and a flash evaporator 11. The valve assembly 40 is connected to an exhaust port and a suction port of the compressor 01, a first end of the first indoor heat exchanger 05, and a first end of the outdoor unit 200, respectively. The valve assembly 40 may be implemented in various manners, and the valve assembly 40 is used to control the flow direction and on/off of a refrigerant (for example, a refrigerant) to form a refrigerant circuit, so that the functions of cooling, heating, and the like can be implemented by controlling the operation of the valve assembly 40.

A first end of the second indoor heat exchanger 06 is connected to an exhaust port of the compressor 01, and a second end of the second indoor heat exchanger 06 is connected to a second end of the first indoor heat exchanger 05 and forms a first connection point P1. The first connection point P1 is connected to the first port of the flash vessel 11, and the first connection point P1 may be connected to the first port of the flash vessel 11 via the line 38. The second port and the third port of the flash evaporator 11 are connected to the air supply port of the compressor 01 and the second end of the outdoor unit apparatus 200, respectively, and the second port and the third port of the flash evaporator 11 may be connected to the air supply port of the compressor 01 and the second end of the outdoor unit apparatus 200 through a pipe 39 and a pipe 37, respectively. The compressor 01 can be various compressors with the functions of air supply and enthalpy increase, and an air supply port of the compressor 01 can be an intermediate air supply port and the like.

The electromagnetic valve 8 is provided in the air supply line between the second port of the flash evaporator 11 and the air supply port of the compressor 01. The first and second indoor heat exchangers 05 and 06 may be various heat exchangers, for example, the second indoor heat exchanger 06 may be an indoor reheater 06, and the first indoor heat exchanger 05 may be an indoor evaporator. The solenoid valve 8 may be various solenoid valves, ball valves, etc. The indoor unit device 100 includes an indoor side fan system 07, and the indoor side fan system 07, the first indoor heat exchanger 05, and the second indoor heat exchanger 06 are located in the same air duct.

The indoor unit device includes a sixth throttling device 09 and a seventh throttling device 10, the sixth throttling device 09 being disposed in the piping between the first indoor heat exchanger 05 and the first connection point P1, and the seventh throttling device 10 being disposed in the piping between the second indoor heat exchanger 06 and the first connection point P1. The sixth and seventh restrictions 09, 10 may be electronic expansion valves or the like.

The flash evaporator 11 may be a flash evaporation tank, and the like, and performs an intermediate enthalpy-increasing function when the heat pump system performs low-temperature heating, so as to improve the heating capacity of the heat pump system, thereby improving the performance of the heat pump system, enabling the heat pump system to realize heating without attenuation in a low-temperature environment, and maintaining the stability and reliability of the function of the heat pump system. Meanwhile, when the refrigeration load is small and the circulation volume of the system refrigerant is small, the flash tank can serve as a liquid storage tank to store the refrigerant. By placing the flash tank on the indoor side, two identical outdoor units can be supported; the flash tank is located at the indoor side, and the length of a connecting pipe between the second port of the flash tank and the middle gas supplementing port of the compressor 01 can be shortened, so that the cost of the connecting pipe is reduced.

The utility model discloses a heat pump system increases the enthalpy technique through middle tonifying qi, makes heat pump system can provide stable heating volume under low temperature or ultra-low temperature environment, realizes heating unattenuated, improves the coefficient of performance that heats, enlarges heat pump system's range of operation and has improved the operating stability.

Fig. 2 is a schematic flow chart of an embodiment of a control method of a heat pump system according to the present invention, as shown in fig. 2:

in step 201, the operation mode of the heat pump system is determined.

And step 203, controlling the actions of the valve assembly and the electromagnetic valve of the indoor unit device according to a preset control strategy and based on the operation mode.

The operation mode includes at least one of a cooling/dehumidifying mode, a second dehumidifying mode, a third dehumidifying mode, a first heating mode, a second heating mode, a first defrosting mode, and a second defrosting mode. The control strategy can be set according to design requirements, and the actions of the valve assembly 40 and the solenoid valve 8 are controlled according to the control strategy and based on the operation mode, so that the functions of a cooling/dehumidifying mode, a second dehumidifying mode, a third dehumidifying mode, a first heating mode, a second heating mode, a first defrosting mode, a second defrosting mode and the like are realized.

In one embodiment, the outdoor unit device 200 includes at least two outdoor units, that is, the number of the outdoor units is two or more, and the number of the outdoor units is two. As shown in fig. 3, the outdoor unit device includes a first outdoor unit 021 and a second outdoor unit 022; the first outdoor unit 021 includes a first outdoor heat exchanger 18, and the second outdoor unit 022 includes a second outdoor heat exchanger 20.

The valve assembly 40 is connected to a first end of the first outdoor heat exchanger 18 and a first end of the second outdoor heat exchanger 20, respectively. A second end of the first outdoor heat exchanger 18 and a second end of the second outdoor heat exchanger 20 are connected and form a second connection point P2, and the second connection point P2 is connected with a third port of the flash evaporator 11. The first and second outdoor heat exchangers 18 and 20 may be various heat exchangers, for example, the first and second outdoor heat exchangers 18 and 20 may both be outdoor condensers. The two outdoor units can finish outdoor side synchronous defrosting, namely one outdoor unit is defrosted and the other outdoor unit is used for refrigeration. By arranging the two outdoor units, the adaptability of the heat pump system can be improved, and the continuity and the stability of the operation of the heat pump system are improved.

The first outdoor unit 021 includes a first outdoor fan system 19, and the second outdoor unit 022 includes a second outdoor fan system 21. The first outdoor fan system 19 and the first outdoor heat exchanger 18 are located in the first air duct, and the second outdoor fan system 21 and the second outdoor heat exchanger 20 are located in the second air duct.

In one embodiment, as shown in FIG. 4, the valve assembly includes a first four-way valve 02, a second four-way valve 03, and a third four-way valve 04. The first port D1 of the first four-way valve 02, the first port D2 of the second four-way valve 03, and the first port D3 of the third four-way valve 04 are connected to the discharge port of the compressor 01, respectively.

A line between the fourth port S1 of the first four-way valve 02 and the suction port of the compressor 01 is connected to the second port E1 of the first four-way valve 02 through the first throttle device 28; a pipeline between the fourth port S2 of the second four-way valve 03 and the suction port of the compressor 01 is connected to a second port E2 of the second four-way valve 03 through a second throttle device 27; a line between the fourth port S3 of the third four-way valve 04 and the suction port of the compressor 01 is connected to the second port E3 of the third four-way valve 04 via the third throttle device 26.

The second port E1 and the fourth port S1 of the first four-way valve 02 are connected by a first throttle device 28, the second port E2 and the fourth port S2 of the second four-way valve 03 are connected by a second throttle device 27, and the second port E3 and the fourth port S3 of the third four-way valve 04 are connected by a third throttle device 26. The first, second and third throttling means 28, 27, 26 may be capillary tubes or the like.

The fourth port S1 of the first four-way valve 02, the fourth port S2 of the second four-way valve 03, and the fourth port S3 of the third four-way valve 04 are respectively communicated with a suction port of the compressor 01. A third port C1 of the first four-way valve 02 is connected to a first end of the first indoor heat exchanger 05. The third port C2 of the second four-way valve 03 is connected to the first end of the first outdoor heat exchanger 18. A third port C3 of the third four-way valve 04 is connected to a first end of the second outdoor heat exchanger 20. The valve assembly uses three four-way valves, can realize the switching of different modes, can reduce the cost of the valve assembly, and has better system reliability, simpler control mode and better popularization.

The second end of the first outdoor heat exchanger 18 and the second end of the second outdoor heat exchanger 20 are connected by a connection member 15, the connection member 15 is a second connection point P2, and the connection member 15 is connected to the third port of the flash evaporator 11.

The indoor unit 100 includes a first cutoff valve 12 and a second cutoff valve 13, the first outdoor unit 021 includes a third cutoff valve 22, and the second outdoor unit 022 includes a fourth cutoff valve 25. The first cut-off valve 12 and the fourth cut-off valve 25 are disposed in a line between the third port C3 of the third four-way valve 04 and the first end of the second outdoor heat exchanger 20; the second and third cut-off valves 13 and 22 are disposed in a line between the third port C2 of the second four-way valve 03 and the first end of the first outdoor heat exchanger 18.

The indoor unit 100 includes a fifth cutoff valve 14, the first outdoor unit 021 includes a sixth cutoff valve 16, and the second outdoor unit 022 includes a seventh cutoff valve 23. A fifth shut-off valve 14 is arranged in the line between the second connection point and the third port of the flash vessel 11; a sixth shutoff valve 16 is provided in the piping between the second connection point and the second end of the first outdoor heat exchanger 18; a seventh cut-off valve 23 is provided in the piping between the second connection point and the second end of the second outdoor heat exchanger 20.

The first outdoor unit 021 includes a fourth throttling device 17; the second outdoor unit 022 includes a fifth throttling device 24; a fourth throttle device 17 is provided in the piping between the sixth cut-off valve 16 and the second end of the first outdoor heat exchanger 18; a fifth throttling device 24 is provided in a pipe between the seventh cutoff valve 23 and the second end of the second outdoor unit 022. The fourth throttle 17 and the fifth throttle 24 may be electronic expansion valves, etc.

As shown in fig. 4, the discharge outlet 30 of the compressor 01 is branched into two branches, a branch 31 and a branch 32. The branch 31 is divided into two branches, a branch 33 and a branch 34. Branch 33 is connected to a first port D3 of the third four-way valve 04 and branch 34 is connected to a first port D2 of the second four-way valve 03. The branch 32 is divided into two branches, a branch 35 and a branch 36. The branch 35 is connected to the second indoor heat exchanger 06, and the branch 36 is connected to the first port D1 of the first four-way valve 02; the branch 35, the second indoor heat exchanger 06, and the seventh throttling device 10 are connected in series, and the third port C1 of the first four-way valve 02, the first indoor heat exchanger 05, and the sixth throttling device 09 are connected in series.

The suction port of the compressor 01 is divided into two paths, and is connected to the fourth port S1 of the first four-way valve 02, the fourth port S2 of the second four-way valve 03, and the fourth port S3 of the third four-way valve 04, respectively, and the first throttling means 28, the second throttling means 27, and the third throttling means 26 may be capillary tubes, for preventing liquid slugging of the valve elements. An air supply port (intermediate air supply port) of the compressor 01 is connected in series with the solenoid valve 08 and the pipe 39 at the first port of the flash evaporator 11. Indoor side fan system 07 and second indoor heat exchanger 06, first indoor heat exchanger 05 are located same wind channel, and indoor side fan system 07 during operation, indoor side return air passes through first indoor heat exchanger 05 earlier, passes through second indoor heat exchanger 06 again.

The second outdoor heat exchanger 20 and the fifth throttling device 24 are connected in series, and the first outdoor heat exchanger 18 and the fourth throttling device 17 are connected in series. The second outdoor fan system 21 and the second outdoor heat exchanger 20 are in the same air duct, and the first outdoor fan system 19 and the first outdoor heat exchanger 18 are in the same air duct.

When the heat pump system operates and the circulation amount of the refrigerant is small, redundant refrigerant can be discharged to the flash evaporator 11 for storage, the electromagnetic valve 08 is powered off and is in a closed state, and the flash evaporator 11 at the moment is equivalent to the function of a liquid storage tank and is used for adjusting the circulation amount of the operation of the heat pump system; when the heat pump system is started to heat and the outdoor environment temperature is lower, the electromagnetic valve 08 is electrified and conducted, the flash evaporator 11 is conducted with the middle air supplement pipe of the compressor 01, and the refrigerant is flashed in the flash evaporator 11, so that middle air supplement is performed, quasi-secondary compression is achieved, and the heating capacity is improved.

Fig. 5 is a schematic flow chart of another embodiment of a control method of a heat pump system according to the present invention, as shown in fig. 5:

in step 501, the operation mode of the heat pump system is determined. The operation mode includes at least one of a cooling/dehumidifying mode, a first heating mode, a second heating mode, a first dehumidification and reheat mode, a second dehumidification and reheat mode, a third dehumidification and reheat mode, a first defrosting mode, a second defrosting mode, and the like.

Step 502, controlling the actions of the first four-way valve 02, the second four-way valve 03, the third four-way valve 04 and the solenoid valve 8 in the indoor unit device according to a preset control strategy and based on the operation mode.

In one embodiment, when one of the first, second, and third four-way valves 02, 03, and 04 is powered down, then the D and C ports of that four-way valve are communicated, and the S and E ports of that four-way valve are communicated; when one of the first, second, and third four-way valves 02, 03, and 04 is energized, the D and E ports of the four-way valve communicate, and the S and C ports of the four-way valve communicate. The electromagnetic valve 08 is switched on or switched on when electrified, and is switched off or switched off when power is lost. The third throttling device 26 and the second throttling device 27 are respectively communicated with the ports E of the third four-way valve 04 and the second four-way valve 03, so that the high-pressure refrigerant returns to the suction port of the compressor 01 after being throttled, the flow can be adjusted, multiple modes can be interchanged, and the required state is achieved.

When low-temperature or ultralow-temperature heating is carried out, the electromagnetic valve 08 is electrified, the second port of the flash evaporator 11 is communicated with the air supplementing port of the compressor 11 through the pipeline 39 and the electromagnetic valve 08, air supplementing and enthalpy increasing are carried out, the heating quantity is increased, and the heating performance of the heat pump system is improved.

The outdoor heat exchangers of the two outdoor units can be the same, asynchronous defrosting can be realized, the indoor side heat exchanger still keeps a high-pressure state during defrosting, indoor side heat output is kept, the phenomenon that the indoor side heat exchanger does not heat during defrosting of a common heat pump air conditioner can be reduced, the resulting indoor temperature fluctuates greatly, the adaptability of the outdoor units is increased, if one outdoor heat exchanger breaks down, the outdoor heat exchanger can be replaced without stopping, and the running stability and the continuity of the unit can be improved.

The entering or exiting of each operation mode can be triggered by detecting parameters such as indoor environment temperature, indoor humidity, outdoor unit system pressure, outdoor environment temperature and the like, and the operation scene of each operation mode can be set. For example, the operating scenario of the cooling/dehumidification mode: when the indoor temperature and humidity are relatively high; operating scenario of the second dehumidification mode: when the indoor temperature is close to the target temperature and the humidity is higher; operating scenario of the third dehumidification mode: the scene is similar to the second dehumidification mode, and the refrigeration or heating of the two outdoor units can be switched; operating scenario of the first heating mode: when the indoor temperature is lower than the target temperature; operating scenario of the second heating mode (vapor-filling enthalpy-increasing): when the outdoor ambient temperature is low; operating scenario of the first defrost mode: the system heats and defrosts synchronously, the second outdoor unit defrosts, and the first outdoor unit refrigerates; operating scenario of the second defrost mode: the system heats and defrosts synchronously, the first outdoor unit defrosts, and the second outdoor unit refrigerates.

In one embodiment, as shown in fig. 6, when the operation mode is the cooling/dehumidifying mode, the first port D1 of the first four-way valve 02 is controlled to communicate with the second port E1, the third port C1 is controlled to communicate with the fourth port S1, the first port D2 of the second four-way valve 03 is controlled to communicate with the third port C2, the second port E2 is controlled to communicate with the fourth port S2, the first port D3 of the third four-way valve 04 is controlled to communicate with the third port C3, the second port E3 is controlled to communicate with the fourth port S3, and the solenoid valve 08 is controlled to be in a closed state. When the operation mode is the cooling/dehumidifying mode, the path of the refrigerant is as shown in fig. 6.

As shown in fig. 7, when the operation mode is the second dehumidification mode, the first port D1 of the first four-way valve 02 is controlled to communicate with the second port E1, the third port C1 is controlled to communicate with the fourth port S1, the first port D2 of the second four-way valve 03 is controlled to communicate with the second port E2, the third port C2 is controlled to communicate with the fourth port S2, the first port D3 of the third four-way valve 04 is controlled to communicate with the third port C3, the second port E3 is controlled to communicate with the fourth port S3, and the solenoid valve 08 is controlled to be in a closed state. When the operation mode is the second dehumidification mode, the path of the refrigerant is as shown in fig. 7.

As shown in fig. 8, when the operation mode is the third dehumidification mode, the first port D1 of the first four-way valve 02 is controlled to communicate with the second port E1, the third port C1 is controlled to communicate with the fourth port S1, the first port D2 of the second four-way valve 03 is controlled to communicate with the third port C2, the second port E2 is controlled to communicate with the fourth port S2, the first port D3 of the third four-way valve 04 is controlled to communicate with the second port E3, the third port C3 is controlled to communicate with the fourth port S3, and the solenoid valve 08 is controlled to be in a closed state. When the operation mode is the third dehumidification mode, the refrigerant passage is as shown in fig. 8.

The cooling mode/dehumidification mode is taken as an example to describe how dehumidification is performed. As shown in fig. 6, the high-temperature and high-pressure refrigerant discharged from the compressor 11 is divided into two branches, a branch 32 passes through a port E1 of the first four-way valve 02 and returns to a suction port of the compressor 01 through the first throttling device 28 (capillary tube), and a branch 31 passes through ports C2 and C3 of the second four-way valve 03 and the third four-way valve 04, respectively, and is discharged to the first outdoor heat exchanger 18 and the second outdoor heat exchanger 20.

The first and second outdoor heat exchangers 18 and 20 condense the refrigerant into a liquid, and then the refrigerant enters the flash evaporator 11. The refrigerant is throttled by the sixth throttling device 09 (electronic expansion valve) to become a low-temperature and low-pressure gas-liquid mixture, evaporation heat exchange is performed in the first indoor heat exchanger 05, indoor wet air passes through the low-temperature first indoor heat exchanger 05, and the refrigerant is condensed into condensed water on the outer surface of the first indoor heat exchanger 05, so that the dehumidification effect is achieved. The evaporated refrigerant returns to the suction port of the compressor 11 through the S1 port of the first four-way valve 02.

The difference between the refrigeration mode/dehumidification mode, the second dehumidification mode and the third dehumidification mode is that the refrigeration circulation volume of the heat pump system is different, and the refrigeration mode/dehumidification mode, the second dehumidification mode and the third dehumidification mode are used for regulating and controlling the temperature and the humidity of the indoor side by regulating and controlling the refrigerant circulation volume, so that the accurate control is achieved.

In one embodiment, as shown in fig. 9, when the operation mode is the first heating mode, the first port D1 of the first four-way valve 02 is controlled to communicate with the third port C1, the second port E1 is controlled to communicate with the fourth port S1, the first port D2 of the second four-way valve 03 is controlled to communicate with the second port E2, the third port C2 is controlled to communicate with the fourth port S2, the first port D3 of the third four-way valve 04 is controlled to communicate with the second port E3, the third port C3 is controlled to communicate with the fourth port S3, and the solenoid valve 08 is controlled to the closed state. When the operation mode is the first heating mode, the path of the refrigerant is as shown in fig. 9.

As shown in fig. 10, when the operation mode is the second heating mode, the first port D1 of the first four-way valve 02 is controlled to communicate with the third port C1, the second port E1 is controlled to communicate with the fourth port S1, the first port D2 of the second four-way valve 03 is controlled to communicate with the second port E2, the third port C2 is controlled to communicate with the fourth port S2, the first port D3 of the third four-way valve 04 is controlled to communicate with the second port E3, the third port C3 is controlled to communicate with the fourth port S3, and the solenoid valve 08 is controlled to an open state. When the operation mode is the second heating mode, the refrigerant passage is as shown in fig. 10.

Taking the second heating mode (air-supply and enthalpy-increase) as an example to explain the heating function, as shown in fig. 10, the high-temperature and high-pressure refrigerant gas discharged from the compressor 01 is divided into two paths, the branch 32 is further divided into two branches, the refrigerant enters the first indoor heat exchanger 05 through the branch 36 and the first four-way valve 02, the refrigerant enters the second indoor heat exchanger 06 through the branch 35, the indoor fan is turned on, and the refrigerant passes through the second four-way valve 03, the port E2 and the port E3 of the third four-way valve 04, and is throttled by the second throttling device 27 (capillary tube) and the third throttling device 26 (capillary tube) and then directly returns to the air suction port of the compressor 01.

The high-temperature and high-pressure refrigerant carries out heat exchange in the first indoor heat exchanger 05 and the second indoor heat exchanger 06, the indoor air is heated, the refrigerant is condensed into liquid and throttled to form a gas-liquid mixture and enters the flash evaporator 11, the refrigerant is flashed in the flash evaporator 11 to enable the liquid at the lower part of the flash evaporator 11 to be supercooled, and the saturated gas at the upper part enters the air supplementing port of the compressor 01 through the pipeline 39. The supercooled liquid enters the first outdoor heat exchanger 18 and the second outdoor heat exchanger 20, and the refrigerant is evaporated in the first outdoor heat exchanger 18 and the second outdoor heat exchanger 20 and then returns to the suction port of the compressor 01 through the S2 port of the second four-way valve 03 and the S3 port of the third four-way valve 04, respectively, to be compressed.

The difference between the first heating mode and the second heating mode (air-make-up enthalpy increase) is that the second heating mode can enable the heat pump system to heat in a low-temperature or ultra-low-temperature outdoor environment, and the heating operation range is expanded.

In one embodiment, as illustrated in fig. 11, when the operation mode is the first defrosting mode, the first port D1 of the first four-way valve 02 is controlled to communicate with the third port C1, the second port E1 is controlled to communicate with the fourth port S1, the first port D2 of the second four-way valve 03 is controlled to communicate with the second port E2, the third port C2 is controlled to communicate with the fourth port S2, the first port D3 of the third four-way valve 04 is controlled to communicate with the third port C3, the second port E3 is controlled to communicate with the fourth port S3, and the solenoid valve 08 is controlled to an open state. When the operation mode is the first defrosting mode, the path of the refrigerant is as shown in fig. 11.

As shown in fig. 12, when the operation mode is the second defrosting mode, the first port D1 of the first four-way valve 02 is controlled to communicate with the third port C1, the second port E1 is controlled to communicate with the fourth port S1, the first port D2 of the second four-way valve 03 is controlled to communicate with the third port C2, the second port E2 is controlled to communicate with the fourth port S2, the first port D3 of the third four-way valve 04 is controlled to communicate with the second port E3, the third port C3 is controlled to communicate with the fourth port S3, and the solenoid valve 08 is controlled to an open state. When the operation mode is the second defrosting mode, a passage of the refrigerant is as shown in fig. 12.

When defrosting is carried out, the indoor side heat exchanger can still keep a high-pressure state, so that the indoor side heat output is kept, and the large fluctuation of the indoor temperature caused by the fact that the indoor side heat exchanger does not heat when a common heat pump air conditioner is defrosted is reduced; the outdoor unit can be defrosted synchronously, and the indoor heat exchanger is in a heating state all the time.

For the first defrosting mode, as shown in fig. 11, the first four-way valve 02 and the third four-way valve 04 are controlled to be powered off, the second four-way valve 03 is controlled to be powered on, the control solenoid valve 08 is opened, the high-temperature and high-pressure refrigerant enters the first indoor heat exchanger 05 and the second indoor heat exchanger 06, and the high-temperature and high-pressure refrigerant enters the second outdoor heat exchanger 20 for defrosting. After heat exchange is carried out by the first indoor heat exchanger 05 and the second indoor heat exchanger 06, the refrigerant enters the flash evaporator 11 for flash evaporation, refrigerant gas returns to the compressor 01 through the pipeline 39, and refrigerant liquid enters the first outdoor heat exchanger 18. The refrigerant liquid defrosted by the second outdoor heat exchanger 20 enters the first outdoor heat exchanger 18 together with the refrigerant liquid input by the flash evaporator 11 to be throttled and evaporated.

The difference between the first defrosting mode and the second defrosting mode is that the first defrosting mode is defrosting by the second outdoor heat exchanger 20, and the second defrosting mode is defrosting by the first outdoor heat exchanger 18, so that the outdoor side can simultaneously perform cooling and defrosting, and the indoor side always keeps a heating state.

In one embodiment, a first control table of the operation mode of the heat pump system corresponding to the component control state is shown in table 1 below:

TABLE 1 first control Table of operating modes and component control states

The second control table in which the operation mode of the heat pump system corresponds to the control state of the components is shown in table 2 below:

TABLE 2 second control Table of operating modes and component control states

The states of the components of the heat pump system can be controlled according to the above first control table and second control table according to the operation mode, and the corresponding functions can be realized. The adjustment mode strategy for the component can be set for different operation modes; and when the heat pump system operates in different operation modes, performing corresponding adjustment treatment on the components according to the adjustment mode strategy.

In one embodiment, the present invention provides an air conditioning apparatus including the heat pump system of any of the above embodiments. The air conditioning equipment may be a heat pump type constant temperature and humidity machine or the like.

The heat pump system and the air conditioning equipment thereof provided by the embodiment can enable the heat pump system to provide stable heating capacity in a low-temperature or ultralow-temperature environment, so that the heating capacity is not attenuated, the heating performance coefficient is improved, the operation range of the heat pump system is expanded, the heating capacity is increased, and the operation stability of the heat pump system is improved; the two same outdoor units are used, asynchronous defrosting can be achieved, the indoor side heat exchanger still keeps a high-pressure state during defrosting, indoor side heat output is kept, indoor temperature caused by the fact that the indoor side heat exchanger does not heat during defrosting of a common heat pump air conditioner is reduced to be greatly fluctuated, the adaptability of the outdoor units is improved, and the use experience of users is improved.

The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically stated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as programs recorded in a recording medium, the programs including machine readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.

The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (11)

1. A heat pump system, comprising:

an indoor unit device (100) and an outdoor unit device (200); the indoor unit device (100) includes: the system comprises a compressor (01), an electromagnetic valve (8), a first indoor heat exchanger (05), a second indoor heat exchanger (06), a valve assembly (40) and a flash evaporator (11); the valve assembly (40) is respectively connected with an exhaust port and an air suction port of the compressor (01), a first end of the first indoor heat exchanger (05) and a first end of the outdoor unit device (200), and the valve assembly (40) is used for controlling the flow direction and the on-off of a refrigerant;

a first end of the second indoor heat exchanger (06) is connected with an exhaust port of the compressor (01), a second end of the second indoor heat exchanger (06) is connected with a second end of the first indoor heat exchanger (05) to form a first connecting point, and the first connecting point is connected with a first port of the flash evaporator (11); the second port and the third port of the flash evaporator (11) are respectively connected with the gas supplementing port of the compressor (01) and the second end of the outdoor unit device (200); the electromagnetic valve (8) is arranged in an air supplementing pipeline between a second port of the flash evaporator (11) and an air supplementing port of the compressor (01).

2. The heat pump system of claim 1,

the outdoor unit device (200) includes: at least two outdoor units.

3. The heat pump system of claim 2, wherein the outdoor unit comprises: a first outdoor unit (021) and a second outdoor unit (022); the first outdoor unit (021) includes: a first outdoor heat exchanger (18), the second outdoor unit (022) comprising: a second outdoor heat exchanger (20);

the valve assembly (40) is respectively connected with a first end of the first outdoor heat exchanger (18) and a first end of the second outdoor heat exchanger (20); a second end of the first outdoor heat exchanger (18) and a second end of the second outdoor heat exchanger (20) are connected and form a second connection point, and the second connection point is connected with a third port of the flash evaporator (11).

4. The heat pump system of claim 3,

the valve assembly includes: a first four-way valve (02), a second four-way valve (03) and a third four-way valve (04);

a first port (D1) of the first four-way valve (02), a first port (D2) of the second four-way valve (03) and a first port (D3) of the third four-way valve (04) are respectively connected with an exhaust port of the compressor (01);

a fourth port (S1) of the first four-way valve (02), a fourth port (S2) of the second four-way valve (03) and a fourth port (S3) of the third four-way valve (04) are respectively communicated with a suction port of the compressor (01);

a pipeline between a fourth port (S1) of the first four-way valve (02) and a suction inlet of the compressor (01) is connected with a second port (E1) of the first four-way valve (02) through a first throttling device (28); a pipeline between a fourth port (S2) of the second four-way valve (03) and the suction inlet of the compressor (01) is connected with a second port (E2) of the second four-way valve (03) through a second throttling device (27); a pipeline between a fourth port (S3) of the third four-way valve (04) and a suction inlet of the compressor (01) is connected with a second port (E3) of the third four-way valve (04) through a third throttling device (26);

a third port (C1) of the first four-way valve (02) is connected with a first end of the first indoor heat exchanger (05); a third port (C2) of the second four-way valve (03) is connected with a first end of the first outdoor heat exchanger (18); and a third port (C3) of the third four-way valve (04) is connected with a first end of the second outdoor heat exchanger (20).

5. The heat pump system of claim 4,

the indoor unit device (100) includes: a first shut-off valve (12) and a second shut-off valve (13); the first outdoor unit (021) includes: a third stop valve (22); the second outdoor unit (022) includes: a fourth stop valve (25);

the first and fourth cut-off valves (12, 25) are disposed in a line between a third port (C3) of the third four-way valve (04) and a first end of the second outdoor heat exchanger (20);

the second and third cut-off valves (13, 22) are disposed in a line between a third port (C2) of the second four-way valve (03) and a first end of the first outdoor heat exchanger (18).

6. The heat pump system of claim 5,

the indoor unit device (100) includes: a fifth stop valve (14); the first outdoor unit (021) includes: a sixth stop valve (16); the second outdoor unit (022) includes: a seventh stop valve (23);

the fifth shut-off valve (14) is arranged in the pipeline between the second connecting point and the third port of the flash evaporator (11); the sixth shut-off valve (16) being disposed in the conduit between the second connection point and the second end of the first outdoor heat exchanger (18); the seventh cut-off valve (23) is disposed in the piping between the second connection point and the second end of the second outdoor heat exchanger (20).

7. The heat pump system of claim 6,

the first outdoor unit (021) includes: a fourth throttling means (17); the second outdoor unit (022) includes: a fifth throttle device (24); -said fourth throttling means (17) are arranged in the line between said sixth shut-off valve (16) and the second end of said first outdoor heat exchanger (18); the fifth throttle device (24) is arranged in the pipeline between the seventh stop valve (23) and the second end of the second outdoor heat exchanger (20).

8. The heat pump system of claim 4,

the indoor unit device includes: a sixth throttling device (09) and a seventh throttling device (10); the sixth throttle device (09) is arranged in a pipeline between the first indoor heat exchanger (05) and the first connection point, and the seventh throttle device (10) is arranged in a pipeline between the second indoor heat exchanger (06) and the first connection point.

9. The heat pump system of claim 3,

the first outdoor unit (021) includes: a first outdoor fan system (19); the second outdoor unit (022) includes: a second outdoor fan system (21);

wherein the first outdoor fan system (19) and the first outdoor heat exchanger (18) are located in a first air duct, and the second outdoor fan system (21) and the second outdoor heat exchanger (20) are located in a second air duct.

10. The heat pump system of claim 1,

the indoor unit device includes: an indoor side fan system (07); the indoor side fan system (07), the first indoor heat exchanger (05) and the second indoor heat exchanger (06) are located in the same air duct.

11. An air conditioning apparatus comprising: a heat pump system according to any one of claims 1 to 10.

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