阅读说明：本技术 热泵系统及控制方法 (Heat pump system and control method ) 是由 吴一梅 柯彬彬 荆莹 郑宏浩 唐长青 于 2019-09-12 设计创作，主要内容包括：本发明提供一种热泵系统及控制方法。其中热泵系统,包括顺次连接形成制冷制热冷媒主循环的压缩机、四通阀、室内换热器、第一节流元件、第一热源换热器,还包括顺次连接形成辅助换热支路的第二热源换热器、第二节流元件,所述第二节流元件的一端连接于所述室内换热器与所述第一热源换热器之间的管路上,所述第二节流元件的另一端与所述第二热源换热器的一端连接,所述第二热源换热器的另一端连接于所述压缩机的吸气口。本发明的一种热泵系统及控制方法,使热泵系统无论处于制热工作模式还是制冷工作模式,都具有两个蒸发器,使保证热泵系统能够同时利用两个热源,大幅提升热泵系统的运行能效,降低热泵系统的运行成本。(The present invention provides a kind of heat pump system and control method.Wherein heat pump system, the compressor of cooling and warming refrigerant major cycle is formed including being sequentially connected with, four-way valve, indoor heat exchanger, first throttle element, first heat source heat exchanger, it further include being sequentially connected with the Secondary Heat Source heat exchanger to form auxiliary heat-exchanging branch, second restricting element, one end of second restricting element is connected on the pipeline between the indoor heat exchanger and the first heat source heat exchanger, the other end of second restricting element is connect with one end of the Secondary Heat Source heat exchanger, the other end of the Secondary Heat Source heat exchanger is connected to the air entry of the compressor.A kind of heat pump system of the invention and control method, make no matter heat pump system is in heating operating mode or refrigeration work mode, all tools enable to guarantee that heat pump system utilizes two heat sources simultaneously there are two evaporator, the operational energy efficiency of heat pump system is substantially improved, reduces the operating cost of heat pump system.)

1. a kind of heat pump system, which is characterized in that including being sequentially connected with the compressor to form cooling and warming refrigerant major cycle, four-way Valve (12), indoor heat exchanger (13), first throttle element (14), the first heat source heat exchanger (15), further include being sequentially connected with to be formed Secondary Heat Source heat exchanger (21), the second restricting element (22) of auxiliary heat-exchanging branch, one end of second restricting element (22) It is connected on the pipeline between the indoor heat exchanger (13) and the first heat source heat exchanger (15), second restricting element (22) the other end is connect with one end of the Secondary Heat Source heat exchanger (21), the other end of the Secondary Heat Source heat exchanger (21) It is connected to the air entry of the compressor.

2. heat pump system according to claim 1, which is characterized in that the evaporating temperature of the Secondary Heat Source heat exchanger (21) Evaporating temperature when higher than in the first heat source heat exchanger (15) or the indoor heat exchanger (13) as evaporator.

3. heat pump system according to claim 1, which is characterized in that the compressor includes the first Two-stage Compression in parallel Machine (111), the second double-stage compressor (112), the exhaust outlet and second Two-stage Compression of first double-stage compressor (111) The exhaust outlet of machine (112) is aggregated to form the first pipeline and connect with the A mouth of the four-way valve (2), first double-stage compressor (111) air entry and the air entry of second double-stage compressor (112) be aggregated to form the second pipeline and with the four-way valve (12) C mouth connection.

4. heat pump system according to claim 3, which is characterized in that first double-stage compressor (111), the second twin-stage Compressor (112) is all Gas-supplying enthalpy-increasing compressor, further includes flash evaporation (16), third restricting element (17), the flash evaporation (16) it is sequentially connected with the third restricting element (17) in the first throttle element (14) and the first heat source heat exchanger (15) between, the flash evaporation (16) is between the first throttle element (14) and the third restricting element (17), institute The first double-stage compressor (111) are stated with the first gas supplementing opening, second double-stage compressor (112) has the second gas supplementing opening, institute The gas tonifying branch for stating flash evaporation (16) is connect by the first solenoid valve (101) with first gas supplementing opening, the flash evaporation (16) Gas tonifying branch connect with second gas supplementing opening by second solenoid valve (102).

5. heat pump system according to claim 4, which is characterized in that the auxiliary heat-exchanging branch includes the first switching pipeline (201), the second switching pipeline (202), it is dry for first between the indoor heat exchanger (13) and the first throttle element (14) Section (203) is the second trunk section (204) between the third restricting element (17) and the first heat source heat exchanger (15), There are third solenoid valve (103) in first switching pipeline (201) and in second restricting element (22) and described the Between one trunk section (203), there is the 4th solenoid valve (104) in second switching pipeline (202) and be in second section Between fluid element (22) and second trunk section (204).

6. heat pump system according to claim 5, which is characterized in that the auxiliary heat-exchanging branch further includes the 5th solenoid valve (105), the 5th solenoid valve (105) be connected to the Secondary Heat Source heat exchanger (21) and the compressor air entry it Between.

7. heat pump system according to claim 6, which is characterized in that second pipeline, which has, is connected to described first pair The first branch section (205) of grade compressor (111) and the second branch section for being connected to second double-stage compressor (112) (206), the 6th solenoid valve (106) is additionally provided on the second branch section (206).

8. a kind of control method of the heat pump system as described in any one of claims 1 to 7, which is characterized in that including following Step:

Obtain the operating mode of heat pump system；

The on-off of solenoid valve and restricting element is controlled, so that heat pump system is run with the operating mode obtained.

9. control method according to claim 8, which is characterized in that

A mouth for controlling four-way valve 12 when the operating mode of acquisition is double heat source tonifying Qi heating modes and D mouthful, B mouthfuls and C mouthfuls divide It is not connected to, controls first throttle element (14), the second restricting element (22), third restricting element (17), the first solenoid valve (101), third solenoid valve (103), the 5th solenoid valve (105) are opened, and control second solenoid valve (102), the 4th solenoid valve (104), the 6th solenoid valve (106) is closed；

Alternatively, when the operating mode of acquisition is the non-tonifying Qi heating mode of double heat sources, control four-way valve 12 A mouth and D mouthfuls, B mouthfuls It is respectively communicated with C mouthfuls, controls first throttle element (14), the second restricting element (22), third restricting element (17), third electromagnetism Valve (103), the 5th solenoid valve (105) are opened, and the first solenoid valve (101), second solenoid valve (102), the 4th solenoid valve are controlled (104), the 6th solenoid valve (106) is closed；

Alternatively, controlling the A mouth and D mouthfuls, B mouthfuls and C of four-way valve 12 when the operating mode of acquisition is single heat source tonifying Qi heating mode Mouth is respectively communicated with, and controls first throttle element (14), third restricting element (17), the first solenoid valve (101), second solenoid valve (102), the 6th solenoid valve (106) is opened, and controls third solenoid valve (103), the 4th solenoid valve (104), the 5th solenoid valve (105), the second restricting element (22) is closed；

Alternatively, when the operating mode of acquisition is the non-tonifying Qi heating mode of single heat source, control four-way valve 12 A mouth and D mouthfuls, B mouthfuls It is respectively communicated with C mouthfuls, controls first throttle element (14), third restricting element (17), third solenoid valve (103), the 6th electromagnetism Valve (106) is opened, and the first solenoid valve (101), second solenoid valve (102), third solenoid valve (103), the 4th solenoid valve are controlled (104), the 5th solenoid valve (105), the second restricting element (22) are closed.

10. control method according to claim 8, which is characterized in that

A mouth for controlling four-way valve 12 when the operating mode of acquisition is double heat source tonifying Qi refrigeration modes and B mouthful, C mouthfuls and D mouthfuls divide It is not connected to, controls first throttle element (14), the second restricting element (22), third restricting element (17), the first solenoid valve (101), the 4th solenoid valve (104), the 5th solenoid valve (105) are opened, and control second solenoid valve (102), third solenoid valve (103), the 6th solenoid valve (106) is closed；

Alternatively, when the operating mode of acquisition is the non-tonifying Qi refrigeration mode of double heat sources, control four-way valve 12 A mouth and B mouthfuls, C mouthfuls It is respectively communicated with D mouthfuls, controls first throttle element (14), the second restricting element (22), third restricting element (17), the 4th electromagnetism Valve (104), the 5th solenoid valve (105) are opened, and the first solenoid valve (101), second solenoid valve (102), third solenoid valve are controlled (103), the 6th solenoid valve (106) is closed；

Alternatively, controlling the A mouth and B mouthfuls, C mouthfuls and D of four-way valve 12 when the operating mode of acquisition is single heat source tonifying Qi refrigeration mode Mouth is respectively communicated with, and controls first throttle element (14), third restricting element (17), the first solenoid valve (101), second solenoid valve (102), the 6th solenoid valve (106) is opened, and controls the second restricting element (22), third solenoid valve (103), the 4th solenoid valve (104), the 5th solenoid valve (105) is closed；

Alternatively, when the operating mode of acquisition is the non-tonifying Qi refrigeration mode of single heat source, control four-way valve 12 A mouth and B mouthfuls, C mouthfuls It is respectively communicated with D mouthfuls, control first throttle element (14), third restricting element (17), the 6th solenoid valve (106) are opened, control Second restricting element (22), the first solenoid valve (101), second solenoid valve (102), third solenoid valve (103), the 4th solenoid valve (104), the 5th solenoid valve (105) is closed.

11. control method according to claim 8, which is characterized in that

When the operating mode of acquisition is defrosting mode, the A mouth of control four-way valve 12 is connected to B mouthfuls, controls the second restricting element (22), the 5th solenoid valve (105) is opened, and controls first throttle element (14), third restricting element (17), the first solenoid valve (101), second solenoid valve (102), third solenoid valve (103), the 4th solenoid valve (104), the 6th solenoid valve (106) are closed.

Technical field

The invention belongs to air-conditioning technique fields, and in particular to a kind of heat pump system and control method.

Background technique

In recent years, it with the aggravation of environmental pollution and the exhaustion of the energy, needs constantly to promote air-conditioning technique, pass through The target of air conditioning high efficiency operation is realized using energy-efficient technological means such as (warm and humid independent control technology and heat pump techniques).Mesh It is preceding to be based on previous reasons on the market, developed a variety of heat pump systems with double evaporators, but these heat pump systems it is most because For the evaporation endothermic cooling purpose of double evaporators, coolant circulating system is caused to be strictly limited in refrigeration mode or heating mould Formula namely existing heat pump system there are problems that having a single function more, also there is the refrigerant circulation in extremely least a portion of heat pump system Switching operating condition with heating and refrigeration, but the effect of its double evaporators but can only occur in heating mode or refrigeration mode Under, the sharing of load of two evaporators can not be adjusted flexibly, the efficiency of heat pump system is relatively low.For example, patent announcement number A kind of big temperature difference water cooler of single machine compression with double stage double evaporators is disclosed for the patent of CN205505465U, can only be realized Double evaporating temperature refrigeration, have a single function, and can not flexibly control the load of two evaporation sides, and do not have the mode of heating condition, Whole equipment is left unused in winter, waste of resource.

Summary of the invention

Therefore, the technical problem to be solved in the present invention is that providing a kind of heat pump system and control method, make heat pump system No matter in heating operating mode or refrigeration work mode, all tools enable to guarantee heat pump system simultaneously there are two evaporator Using two heat sources, the operational energy efficiency of heat pump system is substantially improved, reduces the operating cost of heat pump system.

To solve the above-mentioned problems, the present invention provides a kind of heat pump system, including is sequentially connected with and to form cooling and warming refrigerant Compressor, four-way valve, indoor heat exchanger, first throttle element, the first heat source heat exchanger of major cycle, further include being sequentially connected with shape At the Secondary Heat Source heat exchanger of auxiliary heat-exchanging branch, the second restricting element, one end of second restricting element is connected to described On pipeline between indoor heat exchanger and the first heat source heat exchanger, the other end of second restricting element and described second One end of heat source heat exchanger connects, and the other end of the Secondary Heat Source heat exchanger is connected to the air entry of the compressor.

Preferably, the evaporating temperature of the Secondary Heat Source heat exchanger is higher than the first heat source heat exchanger or the interior Evaporating temperature when in heat exchanger as evaporator.

Preferably, the compressor includes the first double-stage compressor in parallel, the second double-stage compressor, first twin-stage The exhaust outlet of the exhaust outlet of compressor and second double-stage compressor be aggregated to form the first pipeline and with the A of four-way valve mouth The air entry of connection, the air entry of first double-stage compressor and second double-stage compressor is aggregated to form the second pipeline simultaneously It is connect with the C of four-way valve mouth.

Preferably, first double-stage compressor, the second double-stage compressor are all Gas-supplying enthalpy-increasing compressor, further include shwoot Device, third restricting element, the flash evaporation and the third restricting element be sequentially connected in the first throttle element with it is described Between first heat source heat exchanger, the flash evaporation is between the first throttle element and the third restricting element, described First double-stage compressor has the first gas supplementing opening, and second double-stage compressor has the second gas supplementing opening, the benefit of the flash evaporation Gas branch connect by the first solenoid valve with first gas supplementing opening, the gas tonifying branch of the flash evaporation pass through second solenoid valve and The second gas supplementing opening connection.

Preferably, the auxiliary heat-exchanging branch include first switching pipeline, second switching pipeline, the indoor heat exchanger with It is the first trunk section between the first throttle element, is the between the third restricting element and the first heat source heat exchanger Two trunk sections, described first switches in pipeline with third solenoid valve and in second restricting element and first main line There is the 4th solenoid valve between section, in the second switching pipeline and in second restricting element and second trunk section Between.

Preferably, the auxiliary heat-exchanging branch further includes the 5th solenoid valve, and the 5th solenoid valve is connected to described second Between heat source heat exchanger and the air entry of the compressor.

Preferably, second pipeline has the first branch section for being connected to first double-stage compressor and is connected to institute The second branch section of the second double-stage compressor is stated, is additionally provided with the 6th solenoid valve in the second branch section.

The present invention also provides a kind of control methods of heat pump system, comprising the following steps:

Obtain the operating mode of heat pump system；

The on-off of solenoid valve and restricting element is controlled, so that heat pump system is run with the operating mode obtained.

Preferably,

When the operating mode of acquisition is double heat source tonifying Qi heating modes, A mouth of four-way valve and D mouthfuls, B mouthfuls and C mouthfuls are controlled It is respectively communicated with, control first throttle element, the second restricting element, third restricting element, the first solenoid valve, third solenoid valve, the Five solenoid valves are opened, and control second solenoid valve, the 4th solenoid valve, the 6th solenoid valve are closed；

Alternatively, controlling the A mouth and D mouthfuls, B of four-way valve when the operating mode of acquisition tonifying Qi heating mode non-for double heat sources Mouth is respectively communicated with C mouthfuls, control first throttle element, the second restricting element, third restricting element, third solenoid valve, the 5th electricity Magnet valve is opened, and the first solenoid valve of control, second solenoid valve, the 4th solenoid valve, the 6th solenoid valve are closed；

Alternatively, when the operating mode of acquisition be single heat source tonifying Qi heating mode when, control four-way valve A mouth and D mouthfuls, B mouthfuls It is respectively communicated with C mouthfuls, controls first throttle element, third restricting element, the first solenoid valve, second solenoid valve, the 6th solenoid valve It opens, control third solenoid valve, the 4th solenoid valve, the 5th solenoid valve, the second restricting element are closed；

Alternatively, controlling the A mouth and D mouthfuls, B of four-way valve when the operating mode of acquisition tonifying Qi heating mode non-for single heat source Mouth is respectively communicated with C mouthfuls, and control first throttle element, third restricting element, third solenoid valve, the 6th solenoid valve are opened, control First solenoid valve, second solenoid valve, third solenoid valve, the 4th solenoid valve, the 5th solenoid valve, the second restricting element are closed.

Preferably,

When the operating mode of acquisition is double heat source tonifying Qi refrigeration modes, A mouth of four-way valve and B mouthfuls, C mouthfuls and D mouthfuls are controlled It is respectively communicated with, control first throttle element, the second restricting element, third restricting element, the first solenoid valve, the 4th solenoid valve, the Five solenoid valves are opened, and control second solenoid valve, third solenoid valve, the 6th solenoid valve are closed；

Alternatively, controlling the A mouth and B mouthfuls, C of four-way valve when the operating mode of acquisition tonifying Qi refrigeration mode non-for double heat sources Mouth is respectively communicated with D mouthfuls, control first throttle element, the second restricting element, third restricting element, the 4th solenoid valve, the 5th electricity Magnet valve is opened, and the first solenoid valve of control, second solenoid valve, third solenoid valve, the 6th solenoid valve are closed；

Alternatively, when the operating mode of acquisition be single heat source tonifying Qi refrigeration mode when, control four-way valve A mouth and B mouthfuls, C mouthfuls It is respectively communicated with D mouthfuls, controls first throttle element, third restricting element, the first solenoid valve, second solenoid valve, the 6th solenoid valve It opens, the second restricting element of control, third solenoid valve, the 4th solenoid valve, the 5th solenoid valve are closed；

Alternatively, controlling the A mouth and B mouthfuls, C of four-way valve when the operating mode of acquisition tonifying Qi refrigeration mode non-for single heat source Mouth is respectively communicated with D mouthfuls, and control first throttle element, third restricting element, the 6th solenoid valve are opened, and the second throttling of control is first Part, the first solenoid valve, second solenoid valve, third solenoid valve, the 4th solenoid valve, the 5th solenoid valve are closed.

Preferably,

When the operating mode of acquisition is defrosting mode, the A mouth for controlling four-way valve is connected to B mouthfuls, control the second throttling member Part, the 5th solenoid valve are opened, control first throttle element, third restricting element, the first solenoid valve, second solenoid valve, third electricity Magnet valve, the 4th solenoid valve, the 6th solenoid valve are closed.

A kind of heat pump system provided by the invention and control method, since the auxiliary heat-exchanging branch is connected to indoor heat exchange Pipeline between device and the first heat source heat exchanger and between the air entry of compressor, this locates the heat pump system either In refrigeration mode or heating mode, the Secondary Heat Source heat exchanger will all play the effect of heat absorption evaporation, so described in realization Double evaporating temperature modes under the full working scope of heat pump system are conducive to improve while meeting refrigeration with heating needs at the same time The operational energy efficiency of heat pump system reduces operating cost, and enables occasion of the system suitable for warm and humid independent control.

Detailed description of the invention

Fig. 1 is the schematic illustration of the heat pump system of the embodiment of the present invention；

The refrigerant that Fig. 2 is heat pump system operating mode shown in FIG. 1 when being double heat source tonifying Qi heating modes flows to schematic diagram；

The refrigerant flow direction signal that Fig. 3 is heat pump system operating mode shown in FIG. 1 when being the non-tonifying Qi heating mode of double heat sources Figure；

The refrigerant that Fig. 4 is heat pump system operating mode shown in FIG. 1 when being single heat source tonifying Qi heating mode flows to schematic diagram；

The refrigerant flow direction signal that Fig. 5 is heat pump system operating mode shown in FIG. 1 when being the non-tonifying Qi heating mode of single heat source Figure；

The refrigerant that Fig. 6 is heat pump system operating mode shown in FIG. 1 when being defrosting mode flows to schematic diagram；

The refrigerant that Fig. 7 is heat pump system operating mode shown in FIG. 1 when being double heat source tonifying Qi refrigeration modes flows to schematic diagram；

The refrigerant flow direction signal that Fig. 8 is heat pump system operating mode shown in FIG. 1 when being the non-tonifying Qi refrigeration mode of double heat sources Figure；

The refrigerant that Fig. 9 is heat pump system operating mode shown in FIG. 1 when being single heat source tonifying Qi refrigeration mode flows to schematic diagram；

The refrigerant flow direction signal that Figure 10 is heat pump system operating mode shown in FIG. 1 when being the non-tonifying Qi heating mode of single heat source Figure.

Appended drawing reference indicates are as follows:

111, the first double-stage compressor；112, the second double-stage compressor；12, four-way valve；13, indoor heat exchanger；14, first Restricting element；15, the first heat source heat exchanger；16, flash evaporation；17, third restricting element；21, Secondary Heat Source heat exchanger；22, Two restricting elements；101, the first solenoid valve；102, second solenoid valve；103, third solenoid valve；104, the 4th solenoid valve；105, Five solenoid valves；106, the 6th solenoid valve；201, the first switching pipeline；202, the second switching pipeline；203, the first trunk section；204, Second trunk section；205, first branch section；206, second branch section.

Specific embodiment

In conjunction with referring to shown in Fig. 1 to Figure 10, according to an embodiment of the invention, providing a kind of heat pump system, including sequentially connect Connect the compressor to form cooling and warming refrigerant major cycle, four-way valve 12, indoor heat exchanger 13, the 14, first heat of first throttle element Source heat exchanger 15 further includes being sequentially connected with the Secondary Heat Source heat exchanger 21 to form auxiliary heat-exchanging branch, the second restricting element 22, institute The one end for stating the second restricting element 22 is connected to pipeline between the indoor heat exchanger 13 and the first heat source heat exchanger 15 On, the other end of second restricting element 22 is connect with one end of the Secondary Heat Source heat exchanger 21, and the Secondary Heat Source changes The other end of hot device 21 is connected to the air entry of the compressor.In the technical solution, since the auxiliary heat-exchanging branch connects Pipeline between indoor heat exchanger 13 and the first heat source heat exchanger 15 and between the air entry of compressor, this makes the heat Pumping system is either in refrigeration mode or heating mode, the Secondary Heat Source heat exchanger 21 will all play the work of heat absorption evaporation With so realizing double evaporating temperature modes under the full working scope of the heat pump system, at the same time meet refrigeration with heating needs Meanwhile being conducive to improve the operational energy efficiency of heat pump system, operating cost is reduced, and the system is enable to be suitable for warm and humid independence The occasion of control.

Preferably, the evaporating temperature of the Secondary Heat Source heat exchanger 21 is higher than the first heat source heat exchanger 15 or described Evaporating temperature when in indoor heat exchanger 13 as evaporator.Specifically, the first heat source heat exchanger 15 can be using usual Forced convertion heat exchanger (namely air-source), and the Secondary Heat Source heat exchanger 21 then can using solar energy, water source (packet Include rivers and lakes water) heat exchanger, such as in winter (when outside air temperature is lower), the Secondary Heat Source heat exchanger 21 is changed using solar energy Hot device is by the heat (passing through corresponding working medium) of one side recycling high temperature heat source afterwards and in the cooling and warming refrigerant major cycle Refrigerant carries out heat exchange, to promote the evaporating temperature flowed through in the Secondary Heat Source heat exchanger 21, this, which will undoubtedly be improved, compresses The efficiency of machine, namely improve the efficiency of the heat pump system.

For the efficiency for further promoting the heat pump system, it is preferable that the compressor includes the first twin-stage pressure in parallel Contracting machine 111, the second double-stage compressor 112, the four-way valve 12 is with A mouthfuls, B mouthfuls, C mouthfuls, D mouthfuls (as shown in Figure 1, as in the industry It is well known that four-way valve has 4 mouths, it is only especially to be defined for convenience of description herein, it is improper not constitute to the present invention Limitation), the exhaust outlet of the exhaust outlet of first double-stage compressor 111 and second double-stage compressor 112 is aggregated to form the One pipeline is simultaneously connect with the A mouth of the four-way valve 12, the air entry of first double-stage compressor 111 and the second twin-stage pressure The air entry of contracting machine 112 is aggregated to form the second pipeline and connect with the C mouth of the four-way valve 12.

Further, first double-stage compressor 111, the second double-stage compressor 112 are all Gas-supplying enthalpy-increasing compressor, also Including flash evaporation 16, third restricting element 17, the flash evaporation 16 and the third restricting element 17 are sequentially connected in described the Between one restricting element 14 and the first heat source heat exchanger 15, the flash evaporation 16 is in the first throttle element 14 and institute It states between third restricting element 17, first double-stage compressor 111 has the first gas supplementing opening, second double-stage compressor 112 have the second gas supplementing opening, and the gas tonifying branch of the flash evaporation 16 is connected by the first solenoid valve 101 with first gas supplementing opening It connects, the gas tonifying branch of the flash evaporation 16 is connect by second solenoid valve 102 with second gas supplementing opening, by the heat pump system The corresponding system for being designed as having Gas-supplying enthalpy-increasing can further promote the efficiency of the system, wherein first solenoid valve 101, the design of second solenoid valve 102 is conducive to meet flow path switching demand of the heat pump system under different working modes.

The auxiliary heat-exchanging branch includes that the first switching pipeline 201, second switches pipeline 202, the indoor heat exchanger 13 It is the first trunk section 203 between the first throttle element 14, the third restricting element 17 exchanges heat with first heat source It is the second trunk section 204 between device 15, there is third solenoid valve 103 in the first switching pipeline 201 and be in described second Between restricting element 22 and first trunk section 203, there is the 4th solenoid valve 104 in the second switching pipeline 202 and locate Between second restricting element 22 and second trunk section 204, in this way, passing through the 103, the 4th electricity of third solenoid valve The design of magnet valve 104 can further enrich the flow path of refrigerant in the heat pump system, in favor of further enriching the heat pump The type of system operating mode.As a same reason, further, the auxiliary heat-exchanging branch further includes the 5th solenoid valve 105, described 5th solenoid valve 105 is connected between the Secondary Heat Source heat exchanger 21 and the air entry of the compressor；Second pipeline With the first branch section 205 for being connected to first double-stage compressor 111 and it is connected to second double-stage compressor 112 Second branch section 206 is additionally provided with the 6th solenoid valve 106 in the second branch section 206.

According to an embodiment of the invention, also providing a kind of control method of heat pump system, comprising the following steps:

Obtain the operating mode of heat pump system；

The on-off of solenoid valve and restricting element is controlled, so that heat pump system is run with the operating mode obtained.

The operating mode for example can be double heat source tonifying Qi heating modes, the non-tonifying Qi heating mode of double heat sources, single heat source The non-tonifying Qi heating mode of tonifying Qi heating mode, single heat source, defrosting mode, double heat source tonifying Qi refrigeration modes, the non-tonifying Qi system of double heat sources Cold mode, single heat source tonifying Qi refrigeration mode, nine kinds of the non-tonifying Qi refrigeration mode of single heat source.

For example, when the operating mode of acquisition is double heat source tonifying Qi heating modes, controlling four-way valve 12 as shown in Fig. 2 to 5 A mouth be respectively communicated with D mouthfuls, B mouthfuls with C mouthfuls, control first throttle element 14, the second restricting element 22, third restricting element 17, First solenoid valve 101, third solenoid valve 103, the 5th solenoid valve 105 are opened, and second solenoid valve 102, the 4th solenoid valve are controlled 104, the 6th solenoid valve 106 is closed；Alternatively, controlling four-way when the operating mode of acquisition tonifying Qi heating mode non-for double heat sources The A mouth of valve 12 is respectively communicated with D mouthfuls, B mouthfuls with C mouthfuls, control first throttle element 14, the second restricting element 22, third throttling member Part 17, third solenoid valve 103, the 5th solenoid valve 105 are opened, and the first solenoid valve 101, second solenoid valve 102, the 4th electromagnetism are controlled Valve 104, the 6th solenoid valve 106 are closed；Alternatively, controlling four-way when the operating mode of acquisition is single heat source tonifying Qi heating mode The A mouth of valve 12 is respectively communicated with D mouthfuls, B mouthfuls with C mouthfuls, controls first throttle element 14, third restricting element 17, the first solenoid valve 101, second solenoid valve 102, the 6th solenoid valve 106 are opened, and control third solenoid valve 103, the 4th solenoid valve 104, the 5th electromagnetism Valve 105, the second restricting element 22 are closed；Alternatively, when the operating mode of acquisition tonifying Qi heating mode non-for single heat source, control four The A mouth of port valve 12 is respectively communicated with D mouthfuls, B mouthfuls with C mouthfuls, controls first throttle element 14, third restricting element 17, third electromagnetism Valve 103, the 6th solenoid valve 106 are opened, the first solenoid valve 101 of control, second solenoid valve 102, the 103, the 4th electricity of third solenoid valve Magnet valve 104, the 5th solenoid valve 105, the second restricting element 22 are closed.In the technical solution, it is emphasized that working as the work When mode is using double heat sources (either refrigeration or heating), it should ensure that the 6th solenoid valve 106 disconnects, so that the refrigeration The refrigerant of the refrigerant and the auxiliary heat-exchanging branch that heat refrigerant major cycle is independent of each other to respectively enter the first twin-stage pressure Contracting machine 111, the second double-stage compressor 112, and the reduction after preventing the refrigerant of the two different temperatures from mixing to heat pump system efficiency； And in single heat source, then it should ensure that the 6th solenoid valve 106 is opened the 5th solenoid valve 105 and closed, be thusly-formed described First double-stage compressor 111, the second double-stage compressor 112 low-pressure stage compression chamber air entry share a refrigerant pressure.Into One step is it is understood that under double heat source heating modes (tonifying Qi or non-tonifying Qi), the Secondary Heat Source heat exchanger 21 and One heat source heat exchanger 15 is all used as evaporator, and the indoor heat exchanger 13 is then used as condenser.

For another example, when the operating mode of acquisition is double heat source tonifying Qi refrigeration modes, controlling four-way as shown in Fig. 7 to 10 The A mouth of valve 12 is respectively communicated with B mouthfuls, C mouthfuls with D mouthfuls, control first throttle element 14, the second restricting element 22, third throttling member Part 17, the first solenoid valve 101, the 4th solenoid valve 104, the 5th solenoid valve 105 are opened, and second solenoid valve 102, third electromagnetism are controlled Valve 103, the 6th solenoid valve 106 are closed；Alternatively, when the operating mode of acquisition tonifying Qi refrigeration mode non-for double heat sources, control four The A mouth of port valve 12 is respectively communicated with B mouthfuls, C mouthfuls with D mouthfuls, control first throttle element 14, the second restricting element 22, third throttling Element 17, the 4th solenoid valve 104, the 5th solenoid valve 105 are opened, the first solenoid valve 101 of control, second solenoid valve 102, third electricity Magnet valve 103, the 6th solenoid valve 106 are closed；Alternatively, when the operating mode of acquisition is single heat source tonifying Qi refrigeration mode, control four The A mouth of port valve 12 is respectively communicated with B mouthfuls, C mouthfuls with D mouthfuls, controls first throttle element 14, third restricting element 17, the first electromagnetism Valve 101, second solenoid valve 102, the 6th solenoid valve 106 are opened, the second restricting element 22 of control, the 103, the 4th electricity of third solenoid valve Magnet valve 104, the 5th solenoid valve 105 are closed；Alternatively, when the operating mode of acquisition tonifying Qi refrigeration mode non-for single heat source, control The A mouth of four-way valve 12 is respectively communicated with B mouthfuls, C mouthfuls with D mouthfuls, control first throttle element 14, the 17, the 6th electricity of third restricting element Magnet valve 106 is opened, and the second restricting element 22, the first solenoid valve 101, second solenoid valve 102, third solenoid valve the 103, the 4th are controlled Solenoid valve 104, the 5th solenoid valve 105 are closed.It will be further understood that under double heat source refrigeration modes, (tonifying Qi is non- Tonifying Qi), the Secondary Heat Source heat exchanger 21 and indoor heat exchanger 13 are all used as evaporator, and the first heat source heat exchanger 15 use as condenser.

Specifically, as shown in fig. 6, when the operating mode of acquisition be defrosting mode when, control four-way valve 12 A mouth and B mouthfuls Connection, control the second restricting element 22, the 5th solenoid valve 105 open, control first throttle element 14, third restricting element 17, First solenoid valve 101, second solenoid valve 102, third solenoid valve 103, the 4th solenoid valve 104, the 6th solenoid valve 106 are closed, this The heat of high temperature heat source of the Shi Suoshu Secondary Heat Source heat exchanger 21 outside realizes defrost to the first heat source heat exchanger 15, Larger fluctuation is generated without will lead to room temperature.

Those skilled in the art will readily recognize that above-mentioned each advantageous manner can be free under the premise of not conflicting Ground combination, superposition.

The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.Above only It is the preferred embodiment of the present invention, it is noted that for those skilled in the art, do not departing from this hair Under the premise of bright technical principle, several improvements and modifications can also be made, these improvements and modifications also should be regarded as guarantor of the invention Protect range.