WO2021093229A1

WO2021093229A1 - Outdoor system, heat pump system, and control method for heat pump system

Info

Publication number: WO2021093229A1
Application number: PCT/CN2020/078845
Authority: WO
Inventors: 程威; 罗彬�
Original assignee: 广东美的暖通设备有限公司; 美的集团股份有限公司
Priority date: 2019-11-13
Filing date: 2020-03-11
Publication date: 2021-05-20

Abstract

An outdoor system, a heat pump system, and a control method for the heat pump system. The outdoor system comprises: an air supplementation compressor, a reversing assembly, an outdoor heat exchanger, a first heat exchanger, and a cold-medium heat exchanger used to heat a cold medium in an air supplementation loop.

Description

Outdoor system, heat pump system and control method of heat pump system

Cross-references to related applications

This application is based on two Chinese patent applications filed on November 13, 2019 with application numbers: 201911109184.4 and 201921962355.3, and claims the priority of the two Chinese patent applications. The entire contents of the two Chinese patent applications are in This application is hereby incorporated by reference.

Technical field

This application relates to the field of air conditioning, in particular to an outdoor system, a heat pump system, and a control method of the heat pump system.

Background technique

In related technologies, in the heating mode of the heat pump system, the refrigerant absorbs heat from the outdoor air through the outdoor heat exchanger, and then transports the heat from the outdoor side to the room to achieve the heating effect, but in the heating mode in winter, The lower the outdoor temperature, the less heat that can be transported from the outside to the room, and the worse the heating effect of the indoor air conditioner will be.

In addition, due to the characteristics of refrigerant migration during the low-temperature heating start-up period, during the low-temperature heating start-up period, it takes a relatively long time for the refrigerant to migrate from the indoor heat exchanger to the outdoor heat exchanger after the start-up, so that the air cannot be quickly utilized during the start-up. As a result, when the air conditioner is heated at low temperature in winter, the waiting time for hot air from the indoor unit is long, and the user experience is poor.

Application content

This application aims to solve at least one of the technical problems existing in the prior art.

For this reason, this application proposes an outdoor system to shorten the time for hot air from the indoor unit and speed up the heating speed.

This application also proposes a heat pump system with the above outdoor system.

This application also proposes a control method for controlling the above heat pump system.

The outdoor system according to the embodiment of the present application includes: a supplemental air compressor, a reversing component, an outdoor heat exchanger, a first heat exchanger, and a refrigerant heater for heating the refrigerant in the supplemental air circuit. The supplemental air compressor includes an exhaust port, a return air port, and a supplemental air port, the reversing assembly has a first valve port to a fourth valve port, the first valve port and the second valve port and the third valve port One of them is in communication, the fourth valve port is in communication with the other of the second valve port and the third valve port, the first valve port is connected to the exhaust port, and the fourth valve port is connected to The air return ports are connected.

The first end of the outdoor heat exchanger is connected to the second valve port, the first heat exchanger includes a first flow channel and a second flow channel that exchange heat with each other, and the first end of the first flow channel is suitable for In connection with the indoor unit, a first throttling element is connected in series between the second end of the first flow channel and the second end of the outdoor heat exchanger, and the first end of the second flow channel is connected to the first end A second throttling element is connected in series between the second ends of the flow channel, and the second end of the second flow channel is connected with the air supplement port through the air supplement circuit.

According to the outdoor system of the embodiment of the present application, a refrigerant heater for heating the refrigerant in the supplement gas circuit is provided in the supplement gas circuit, and the refrigerant in the supplement gas circuit is heated to the gaseous state by the refrigerant heater, and then the gaseous state The refrigerant directly enters the supplementary air compressor through the supplementary air port. On the one hand, it can increase the refrigerant circulation speed of the supplementary compressor during the start-up period, increase the output power of the supplementary compressor, and accelerate the heating speed. On the other hand, Ensure that all refrigerants entering the supplemental gas compressor in the supplemental gas circuit are gaseous refrigerants. As far as the safety of the supplementary gas compressor is concerned, there is no risk of liquid return.

In some embodiments of the present application, the refrigerant heater includes: a second heat exchanger and a heating element, the second heat exchanger has a refrigerant flow path, and the second heat exchanger is connected in series to the supplemental air circuit , The heating element is used to heat the second heat exchanger.

In some embodiments of the present application, the heating element includes: an electromagnetic heating coil and an electromagnetic heater, the electromagnetic heating coil is adapted to be connected to a power source, and the electromagnetic heater senses the magnetic field of the electromagnetic heating coil to generate heat, The electromagnetic heater is in contact with the second heat exchanger to transfer heat to the second heat exchanger.

In some embodiments of the present application, the refrigerant heater further includes a heat-insulating material piece, and the heat-insulating material piece is wrapped around the electromagnetic heater and the second heat exchanger.

In some embodiments of the application, the electromagnetic heater is a steel plate.

In some embodiments of the present application, the second heat exchanger is a microchannel heat exchanger.

The heat pump system according to the embodiment of the present application includes an indoor unit and an outdoor system. The outdoor system is the outdoor system described in the above-mentioned embodiment of the application, and the third valve port and the first of the first flow channel The terminals are respectively connected with the indoor unit.

According to the heat pump system of the embodiment of the present application, a refrigerant heater for heating the refrigerant in the supplement gas circuit is provided in the supplement gas circuit, and the refrigerant in the supplement gas circuit is heated to the gaseous state by the refrigerant heater, and then the gaseous state The refrigerant directly enters the supplementary air compressor through the supplementary air port. On the one hand, it can increase the refrigerant circulation speed of the supplementary compressor during the start-up period, increase the output power of the supplementary compressor, and accelerate the heating speed. On the other hand, Ensure that all refrigerants entering the supplemental gas compressor in the supplemental gas circuit are gaseous refrigerants. As far as the safety of the supplementary gas compressor is concerned, there is no risk of liquid return.

According to the control method of the heat pump system according to the embodiment of the present application, the heat pump system is the heat pump system according to the embodiment of the present application, and the control method includes the following steps: during heating operation, detecting outdoor ambient temperature; determining outdoor Whether the ambient temperature T is less than the first set temperature T0; if the outdoor ambient temperature T is less than the first set temperature T0, control the refrigerant heater to turn on to heat the refrigerant in the supplemental gas circuit.

According to the control method of the heat pump system of the embodiment of the present application, a refrigerant heater for heating the refrigerant in the supplement gas circuit is provided in the supplement gas circuit, and the refrigerant in the supplement gas circuit is heated to a gaseous state by the refrigerant heater, Then the gaseous refrigerant directly enters the supplemental gas compressor through the supplementary gas port. On the one hand, it can increase the refrigerant circulation speed of the supplementary compressor during the startup period, increase the output power of the supplementary compressor, and accelerate the heating speed. On the one hand, it is ensured that all refrigerants entering the supplemental gas compressor in the supplemental gas circuit are gaseous refrigerants, and there is no risk of liquid return for the safety of the supplementary compressor.

In some embodiments of the present application, after the refrigerant heater is controlled to be turned on, it is determined whether the condition of the refrigerant heater satisfies at least one of the following conditions: the turn-on time of the refrigerant heater reaches the set time, and the refrigerant heating The temperature of the heater reaches the second set temperature T1; if at least one of the above conditions is met, the refrigerant heater is turned off, and if none is met, the heating power of the refrigerant heater is adjusted.

In some embodiments of the present application, the control method further includes the following steps: when the heat pump system is running, detecting the temperature difference between the two ends of the second flow channel and determining whether the temperature difference is less than the first set temperature difference T2; if If the temperature difference is less than the first set temperature difference T2, the refrigerant heater is controlled to turn on to heat the refrigerant in the supplemental gas circuit, otherwise the refrigerant heater is controlled to turn off.

In some embodiments of the present application, after the refrigerant heater is turned on, continue to detect the temperature difference between the two ends of the second flow channel and determine whether the temperature difference is less than the second set temperature difference T3; if the temperature difference reaches the second Set the temperature difference T3, turn off the refrigerant heater; if the temperature difference is less than the second set temperature difference T3, control the refrigerant heater to continue heating until the temperature difference reaches the second set temperature difference T3, then turn off the refrigerant heater Refrigerant heater.

The additional aspects and advantages of the present application will be partly given in the following description, and part of them will become obvious from the following description, or be understood through the practice of the present application.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a schematic diagram of an outdoor system according to an embodiment of the present application;

Figure 2 is a schematic diagram of a heating element according to an embodiment of the present application;

Figure 3 is a control logic diagram of the refrigerant heater during the heating period of the heat pump system according to an embodiment of the present application;

Fig. 4 is a control logic diagram of the refrigerant heater in the heat pump system according to an embodiment of the present application when there is a risk of liquid return in the air supplement circuit.

Reference signs:

100. Outdoor system;

1. Supplementary air compressor; 11. Exhaust port; 12. Return air port; 13. Supplement air port;

2. Reversing component; 21, the first valve port; 22, the second valve port; 23, the third valve port; 24, the fourth valve port;

3. Outdoor heat exchanger;

4. The first heat exchanger; 41, the first runner; 42, the second runner;

5. Refrigerant heater; 51, second heat exchanger; 52, heating element; 521, electromagnetic heating coil; 522, power supply; 523, electromagnetic heater; 524, thermal insulation material;

6. Air supplement circuit.

Detailed ways

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present application, and should not be understood as a limitation to the present application.

In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply the pointed device or element It must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to this application. In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of this application, unless otherwise specified, "plurality" means two or more.

In the description of this application, it should be noted that the terms "installation", "connection", and "connection" should be understood in a broad sense, unless otherwise clearly specified and limited. For example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood under specific circumstances.

The outdoor system 100 according to an embodiment of the present application will be described below with reference to FIGS. 1 to 4. The outdoor system 100 may be a jet enthalpy air conditioning system.

The outdoor system 100 according to the embodiment of the present application includes: a supplemental air compressor 1, a reversing assembly 2, an outdoor heat exchanger 3, a first heat exchanger 4, and a refrigerant for heating the refrigerant in the supplemental air circuit 6 Heater 5. The supplemental air compressor 1 includes an exhaust port 11, a return air port 12, and a supplemental air port 13. The refrigerant can enter the supplemental air compressor 1 from the return air inlet 12, and is compressed by the supplementary air compressor 1 and then discharged from the exhaust outlet 11.

As shown in Figure 1, the reversing assembly 2 has a first valve port 21 to a fourth valve port 24, the first valve port 21 is in communication with one of the second valve port 22 and the third valve port 23, and the fourth valve port 24 is in communication with the other of the second valve port 22 and the third valve port 23. It can be understood that the first valve port 21 is switched to communicate with one of the second valve port 22 and the third valve port 23, and the fourth valve port The valve port 24 is in switching communication with the other of the second valve port 22 and the third valve port 23, and the flow direction of the refrigerant can be changed by manipulating the reversing assembly 2, so that the air-conditioning system provided with the outdoor system 100 can operate in the cooling mode and control mode. Switch between thermal modes.

As shown in FIG. 1, the first valve port 21 is connected with the exhaust port 11, and the fourth valve port 24 is connected with the return port 12. It can be understood that by connecting the first valve port 21 with the exhaust port 11, the refrigerant discharged from the exhaust port 11 of the supplemental gas compressor 1 enters the reversing assembly 2 through the first valve port 21 to change The refrigerant in the component 2 then flows out through the second valve port 22 or the third valve port 23 according to the function mode of the outdoor system 100, and the refrigerant in the reversing component 2 flows out through the fourth valve port 24, and then passes through the air return port 12 Backflow into the supplemental air compressor 1.

The first end of the outdoor heat exchanger 3 is connected to the second valve port 22 to allow the refrigerant to flow between the outdoor heat exchanger 3 and the reversing assembly 2. For example, in the heating mode, the outdoor heat exchanger 3 makes the belt The refrigerant with heat flows into the reversing assembly 2 through the first end.

As shown in Figure 1, the first heat exchanger 4 includes a first flow channel 41 and a second flow channel 42 that exchange heat with each other. The first heat exchanger 4 may be a plate heat exchanger. The heat exchanger 4 has two independent first flow passages 41 and second flow passages 42. When the refrigerant in the first flow passage 41 and the second flow passage 42 flows sequentially, the first flow passage 41 and the second flow passage 42 The refrigerant inside can achieve mutual heat exchange in the first heat exchanger 4.

Wherein, the first end of the first flow channel 41 is suitable for connecting with an indoor unit, and a first throttling element is connected in series between the second end of the first flow channel 41 and the second end of the outdoor heat exchanger 3. A second throttling element is connected in series between the first end of the second flow channel 42 and the second end of the first flow channel 41, and the second end of the second flow channel 42 is connected to the air supplement port 13 through the air supplement circuit 6. It is understandable that in the heating mode, the refrigerant enters the first heat exchanger 4 through the first end of the first flow passage 41 to cool down, and then flows out of the second end of the first flow passage 41, and part of the refrigerant after flowing out After cooling by the first throttling element, it flows to the outdoor heat exchanger 3. After the outdoor heat exchanger 3 absorbs the heat from the outside, it flows into the supplementary air compressor 1, and the other part flows through the second throttling element and then passes through the second throttling element. The first end of the second runner 42 flows back into the first heat exchanger 4. At this time, the refrigerant in the second runner 42 exchanges heat with the refrigerant in the first runner 41. After the temperature rises, it flows out from the second end of the second flow passage 42 to the supplemental gas circuit 6. The refrigerant is heated in the supplementary gas circuit 6 by the refrigerant heater 5, and then flows into the supplemental gas compressor 1, so that Shorten the hot air time of the indoor unit and speed up the heating speed.

In addition, the supplemental gas circuit 6 is provided with a refrigerant heater 5 for heating the refrigerant in the supplemental gas circuit 6. When the outdoor system 100 is in the heating mode, the refrigerant heater 5 is used to heat the refrigerant in the supplementary gas circuit 6 The refrigerant is heated to a gaseous state, and then the gaseous refrigerant is directly entered into the supplemental air compressor 1 through the supplementary air port 13, so that the supplementary air compressor 1 can be compressed quickly and discharged from the exhaust port 11, thereby shortening the hot air from the indoor unit Time, speed up the heating speed.

By setting the refrigerant heater 5 in the supplemental air circuit 6, during the low-temperature heating start period, after the supplemental air compressor 1 is turned on, the refrigerant heater 5 is turned on, which can effectively increase the power of the supplementary air compressor 1, and at the same time, the refrigerant passing through the indoor unit Returning to the supplemental gas compressor 1 through the supplemental gas circuit 6 can achieve rapid heat absorption, so that hot air can be quickly discharged during low-temperature heating to achieve the purpose of rapid heating.

It should be noted that the flow rate of the refrigerant flowing into the supplemental air circuit 6 and the outdoor heat exchanger 3 is controlled by the first and second throttling elements. When the outdoor temperature is low or during the start of low-temperature heating, the flow rate of the refrigerant can be increased. Part of the refrigerant flows into the air supplement circuit 6 and is heated by the refrigerant heater 5 in the air supplement circuit 6. The heated gaseous refrigerant directly enters the air supplement compressor 1 through the air supplement port 13, which can increase the air supplement on the one hand. The refrigerant circulation speed of the compressor 1 during the start-up period increases the output power of the supplemental air compressor 1, thereby speeding up the heating speed. On the other hand, it is ensured that all the refrigerant entering the supplemental air circuit 6 into the supplemental air compressor 1 is gaseous refrigerant. As far as the safety of the supplemental air compressor 1 is concerned, there is no risk of liquid return.

According to the outdoor system 100 of the embodiment of the present application, the supplemental air circuit 6 is provided with a refrigerant heater 5 for heating the refrigerant in the supplemental air circuit 6, and the refrigerant in the supplemental air circuit 6 is heated by the refrigerant heater 5 To the gaseous state, the gaseous refrigerant directly enters the supplementary gas compressor 1 through the supplementary gas port 13. On the one hand, it can increase the refrigerant circulation speed of the supplementary gas compressor 1 during the start-up period, and increase the output power of the supplementary gas compressor 1. This speeds up the heating speed. On the other hand, it is ensured that all the refrigerant entering the supplemental compressor 1 in the supplemental gas circuit 6 is gaseous refrigerant. For the safety of the supplementary compressor 1, there is no risk of liquid return, thereby ensuring the reliability of the system.

As shown in Figures 1 and 2, in some embodiments of the present application, the refrigerant heater 5 includes: a second heat exchanger 51 and a heating element 52. The second heat exchanger 51 has a refrigerant flow path, and the second heat exchange The device 51 is connected in series to the supplemental gas circuit 6, and the heating element 52 is used to heat the second heat exchanger 51. That is to say, the second heat exchanger 51 is connected in series to the supplemental gas circuit 6. During the process of the refrigerant flowing through the second heat exchanger 51, the second heat exchanger 51 is heated by the heating element 52, so as to realize the heating of the second heat exchanger 51. The purpose of heating the refrigerant in the second heat exchanger 51. Therefore, the structure of the refrigerant heater 5 is simple.

As shown in Figures 1 and 2, in some embodiments of the present application, the heating element 52 includes: an electromagnetic heating coil 521 and an electromagnetic heater 523. The electromagnetic heating coil 521 is adapted to be connected to a power supply 522, and the electromagnetic heater 523 senses the electromagnetic The magnetic field of the heating coil 521 generates heat, and the electromagnetic heater 523 contacts the second heat exchanger 51 to transfer the heat to the second heat exchanger 51. In other words, after the electromagnetic heating coil 521 is connected to the power supply 522, the electromagnetic heating coil 521 generates an electromagnetic induction magnetic field, and the electromagnetic heater 523 generates heat under the action of the electromagnetic induction magnetic field and transfers the heat to the second heat exchanger 51, thereby When the refrigerant passes through the second heat exchanger 51, the heat is taken away in time, so as to achieve the purpose of heating the refrigerant in the supplemental air circuit 6.

As shown in FIGS. 1 and 2, in some embodiments of the present application, the refrigerant heater 5 further includes a heat-insulating material piece 524, and the heat-insulating material piece 524 is wrapped on the outside of the electromagnetic heater 523 and the second heat exchanger 51 . That is to say, the electromagnetic heater 523 and the second heat exchanger 51 are both wrapped with a heat insulation material 524, and the heat insulation material 524 may be thermal insulation cotton to improve the electromagnetic heater 523 and the second heat exchanger 51. The heat preservation effect of 51, so that the heat generated by the electromagnetic heater 523 can better heat the second heat exchanger 51.

In some embodiments of the present application, a thermal insulation material 524 may be provided on the outside of the second heat exchanger 51, between the electromagnetic heater 523 and the magnetic heating coil. The thermal insulation material 524 may be thermal insulation cotton to improve The heat preservation effect of the second heat exchanger 51 enables the heat generated by the electromagnetic heater 523 to better heat the second heat exchanger 51.

In some embodiments of the present application, the electromagnetic heater 523 is a steel plate. The steel plate generates heat under the action of the electromagnetic induction magnetic field and transfers the heat to the second heat exchanger 51 to achieve the purpose of heating the second heat exchanger 51, thereby making the structure of the electromagnetic heater 523 simple and saving cost.

In some embodiments of the present application, the second heat exchanger 51 is a microchannel heat exchanger. In other words, the second heat exchanger 51 may be a microchannel heat exchanger. After the electromagnetic heating coil 521 is connected to the power supply 522, the electromagnetic heating coil 521 generates an electromagnetic induction magnetic field, and the electromagnetic heater 523 generates heat under the action of the electromagnetic induction magnetic field. , And transfer the heat to the micro-channel heat exchanger. There are multiple micro-channels in the micro-channel heat exchanger, so that the refrigerant can flow through the micro-channel heat exchanger through multiple micro-channels to improve each micro-channel heat exchanger. The flow rate of the refrigerant enables the high-speed circulating refrigerant to take away the heat in time, so as to increase the heat exchange efficiency and meet the higher energy efficiency standards.

The heat pump system according to the embodiment of the present application includes an indoor unit and an outdoor system 100. The outdoor system 100 is the outdoor system 100 in the above-mentioned embodiment of the application. The third valve port 23 and the first end of the first flow channel 41 are connected to the indoor unit respectively. The machine is connected.

It can be understood that one end of the indoor unit is connected to the third valve port 23, and the other end of the indoor unit is connected to the first end of the first flow passage 41. In the heating mode, the supplemental air compressor 1 is compressed from the exhaust The refrigerant discharged from the air port 11 enters the reversing assembly 2, the refrigerant in the reversing assembly 2 enters the indoor unit through the third valve port 23, and the refrigerant in the indoor unit flows into the first flow passage 41 after heat exchange.

In addition, by providing a refrigerant heater 5 in the supplemental gas circuit 6 for heating the refrigerant in the supplemental gas circuit 6, when the outdoor system 100 is in the heating mode, the refrigerant heater 5 is used to heat the refrigerant in the supplementary gas circuit 6 The refrigerant is heated to the gaseous state, and then the gaseous refrigerant enters the supplementary compressor 1 directly through the supplementary air port 13, so that the supplementary compressor 1 can be compressed quickly and then discharged from the exhaust port 11, thereby shortening the hot air from the indoor unit Time, speed up the heating speed.

According to the heat pump system of the embodiment of the present application, a refrigerant heater 5 for heating the refrigerant in the supplementary circuit 6 is provided in the supplemental gas circuit 6. The refrigerant heater 5 heats the refrigerant in the supplemental gas circuit 6 to In the gaseous state, the gaseous refrigerant enters the supplementary gas compressor 1 directly through the supplementary gas port 13. On the one hand, it can increase the refrigerant circulation speed of the supplementary gas compressor 1 during the start-up period, and increase the output power of the supplementary gas compressor 1, thereby Speed up the heating speed. On the other hand, it is ensured that all the refrigerants entering the supplemental gas compressor 1 in the supplemental gas circuit 6 are gaseous refrigerants. For the safety of the supplementary gas compressor 1, there is no risk of liquid return.

In some embodiments of the present application, one end of the indoor unit is connected to the third valve port 23 through a gas side stop valve, and the other end of the indoor unit is connected to the first end of the first flow channel 41 through a liquid side stop valve.

As shown in FIGS. 1 to 4, according to the control method of the heat pump system according to the embodiment of the present application, the heat pump system is the heat pump system according to the embodiment of the present application, and the control method includes the following steps: detecting outdoor ambient temperature during heating operation; It is determined whether the outdoor ambient temperature T is less than the first set temperature T0; if the outdoor ambient temperature T is less than the first set temperature T0, the refrigerant heater 5 is controlled to turn on to heat the refrigerant in the supplemental air circuit 6.

That is to say, by detecting the outdoor ambient temperature T, when the outdoor ambient temperature T is less than the first set temperature T0, it is determined that the outdoor ambient temperature is low, and there is a risk of low-temperature heating startup, and the refrigerant heater 5 is turned on to compensate The refrigerant in the gas circuit 6 is heated to the gaseous state, and then the gaseous refrigerant enters the supplemental gas compressor 1 directly through the supplementary gas port 13. On the one hand, it can increase the refrigerant circulation speed of the supplementary gas compressor 1 during the startup period and increase the supplementary gas. The output power of the air compressor 1 can speed up the heating speed. On the other hand, it is ensured that all the refrigerants entering the air supply circuit 6 into the air supply compressor 1 are gaseous refrigerants. As far as the safety of the air supply compressor 1 is concerned, there is no liquid return. risk.

According to the control method of the heat pump system of the embodiment of the present application, a refrigerant heater 5 for heating the refrigerant in the supplementary circuit 6 is provided in the supplemental gas circuit 6. When there is a risk of low-temperature heating startup, the refrigerant is heated by the refrigerant The device 5 heats the refrigerant in the supplemental gas circuit 6 to a gaseous state, and then causes the gaseous refrigerant to directly enter the supplemental gas compressor 1 through the supplementary gas port 13, which can increase the refrigerant circulation speed of the supplementary gas compressor 1 during the startup period. , Increase the output power of the supplemental air compressor 1, thereby speeding up the heating speed. On the other hand, ensure that all the refrigerants entering the supplemental air compressor 1 in the supplemental air circuit 6 are gaseous refrigerants, which is important for the safety of the supplementary air compressor 1. , There is no risk of liquid back.

As shown in FIGS. 1 and 3, in some embodiments of the present application, after the refrigerant heater 5 is controlled to turn on, it is determined whether the condition of the refrigerant heater 5 meets at least one of the following conditions: Set time, the temperature of the refrigerant heater 5 reaches the second set temperature T1; if at least one of the above conditions is met, the refrigerant heater 5 is turned off, and if none is met, the heating power of the refrigerant heater 5 is adjusted.

Specifically, the supplemental air compressor 1 can be turned on first, and then the refrigerant heater 5 may be turned on. At the same time, by detecting the turn-on time of the refrigerant heater 5 and the temperature of the refrigerant heater 5, when the turn-on time of the refrigerant heater 5 reaches the set time Or when the temperature of the refrigerant heater 5 reaches the second set temperature T1, the refrigerant heater 5 can be turned off. At this time, the supplemental air compressor 1 has entered the normal operating state. If the above conditions are not met, the refrigerant heater can be turned off. 5 Continue to run and adjust the heating power of the refrigerant heater 5 until one of the above conditions is met.

It should be noted that to adjust the heating power of the refrigerant heater 5, a PI regulator (proportional integral controller) can be used to perform PI adjustment control on the refrigerant heater 5. Specifically, the actual temperature of the refrigerant heater 5 and the second set temperature T1 The deviation of △T is △T, and the value of △T is used as the reference of PI adjustment control. When the value of △T is larger, the power of the refrigerant heater 5 is greater. When the value of △T is smaller, the power of the refrigerant heater 5 is The smaller the value, when the value of ΔT is zero, the power of the refrigerant heater 5 is zero, and the refrigerant heater 5 is turned off. The principle of PI adjustment control has been known to those skilled in the art, and will not be described in detail in this application.

As shown in Figures 1 and 4, in some embodiments of the present application, the control method further includes the following steps: when the heat pump system is running, detecting the temperature difference between the two ends of the second flow channel 42 and determining whether the temperature difference is smaller than the first setting Set the temperature difference T2; if the temperature difference is less than the first set temperature difference T2, the refrigerant heater 5 is controlled to turn on to heat the refrigerant in the supplemental air circuit 6, otherwise the refrigerant heater 5 is controlled to turn off.

In other words, the temperature difference between the two ends of the second flow channel 42 can be detected to determine whether the temperature at both ends of the second flow channel 42 is less than the first set temperature difference T2. When it is determined that the temperature difference is less than the first set temperature difference At T2, it proves that the supplemental gas circuit 6 may have a risk of liquid return. At this time, the refrigerant heater 5 is turned on to heat the refrigerant in the supplemental gas circuit 6 to ensure that the refrigerant returning from the supplemental gas circuit 6 to the supplemental compressor 1 is In a gaseous state, the effect of preventing the liquid refrigerant from flowing to the supplemental gas compressor 1 is achieved, so as to further protect the supplementary gas compressor 1.

As shown in Fig. 1, in some embodiments of the present application, a temperature sensor T6a may be provided at the first end of the second flow channel 42, and a temperature sensor T6b may be provided at the second end of the second flow channel 42, by determining that the temperature sensor Whether the temperature difference between T6a and the temperature sensor T6b is smaller than the first set temperature difference T2, so that the accuracy of detecting the temperature difference between the two ends of the second flow channel 42 can be improved.

As shown in FIGS. 1 and 4, in some embodiments of the present application, after the refrigerant heater 5 is turned on, continue to detect the temperature difference between the two ends of the second flow channel 42 and determine whether the temperature difference is less than the second set temperature difference T3 ; If the temperature difference reaches the second set temperature difference T3, turn off the refrigerant heater 5; if the temperature difference is less than the second set temperature difference T3, control the refrigerant heater 5 to continue heating until the temperature difference reaches the second set temperature difference Turn off the refrigerant heater 5 after T3.

That is to say, during the process of turning on the refrigerant heater 5, the temperature difference between the two ends of the second flow channel 42 can continue to be monitored. When the temperature difference is less than the second set temperature difference T3, it is proved that the supplementary air circuit 6 may have a return. Therefore, the heating power of the refrigerant heater 5 is adjusted to ensure that the refrigerant returning from the supplemental gas circuit 6 to the supplemental gas compressor 1 is in a gaseous state, thereby further protecting the supplementary gas compressor 1.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials, or characteristics described by the examples or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and modifications can be made to these embodiments without departing from the principle and purpose of the present application. The scope of the application is defined by the claims and their equivalents.

Claims

An outdoor system, characterized in that it comprises:

A supplemental air compressor, which includes an exhaust port, a return air port and a supplemental air port;

A reversing assembly, the reversing assembly has a first valve port to a fourth valve port, the first valve port communicates with one of the second valve port and the third valve port, and the fourth valve port is connected to the The second valve port is connected to the other of the third valve ports, the first valve port is connected to the exhaust port, and the fourth valve port is connected to the air return port;

An outdoor heat exchanger, the first end of the outdoor heat exchanger is connected to the second valve port;

The first heat exchanger, the first heat exchanger includes a first flow channel and a second flow channel that exchange heat with each other, the first end of the first flow channel is adapted to be connected with an indoor unit, and the first end of the first flow channel A first throttling element is connected in series between the two ends and the second end of the outdoor heat exchanger, and a second section is connected in series between the first end of the second flow channel and the second end of the first flow channel Flow element, the second end of the second flow channel is connected to the air supplement port through an air supplement circuit;

A refrigerant heater used to heat the refrigerant in the supplemental air circuit.
The outdoor system according to claim 1, wherein the refrigerant heater comprises:

A second heat exchanger, the second heat exchanger having a refrigerant flow path, and the second heat exchanger is connected in series on the supplemental gas circuit;

The heating element is used to heat the second heat exchanger.
The outdoor system according to claim 2, wherein the heating element comprises:

An electromagnetic heating coil, the electromagnetic heating coil is suitable for being connected to a power source;

An electromagnetic heater that senses the magnetic field of the electromagnetic heating coil to generate heat, and the electromagnetic heater is in contact with the second heat exchanger to transfer heat to the second heat exchanger.
The outdoor system according to claim 3, wherein the refrigerant heater further comprises a heat-insulating material piece, and the heat-insulating material piece is wrapped around the electromagnetic heater and the second heat exchanger.
The outdoor system according to claim 3 or 4, wherein the electromagnetic heater is a steel plate.
The outdoor system according to any one of claims 2 to 5, wherein the second heat exchanger is a microchannel heat exchanger.
A heat pump system is characterized in that it comprises:

Indoor unit

An outdoor system, the outdoor system is the outdoor system according to any one of claims 1-6, and the third valve port and the first end of the first flow channel are respectively connected to the indoor unit.
A control method of a heat pump system, wherein the heat pump system is the heat pump system according to claim 7, and the control method includes the following steps:

Detect outdoor ambient temperature during heating operation;

Determine whether the outdoor ambient temperature T is less than the first set temperature T0;

If the outdoor ambient temperature T is less than the first set temperature T0, the refrigerant heater is controlled to be turned on to heat the refrigerant in the supplemental air circuit.
The control method of the heat pump system according to claim 8, wherein after the refrigerant heater is controlled to turn on, it is determined whether the condition of the refrigerant heater satisfies at least one of the following conditions: the turn-on time of the refrigerant heater reaches Set time, the temperature of the refrigerant heater reaches the second set temperature T1;

If at least one of the above conditions is met, the refrigerant heater is turned off, and if none is met, the heating power of the refrigerant heater is adjusted.
The control method of the heat pump system according to claim 8 or 9, characterized in that it further comprises the following steps:

When the heat pump system is running, detect the temperature difference between the two ends of the second flow channel and determine whether the temperature difference is less than the first set temperature difference T2;

If the temperature difference is less than the first set temperature difference T2, the refrigerant heater is controlled to be turned on to heat the refrigerant in the supplemental gas circuit; otherwise, the refrigerant heater is controlled to be turned off.
The control method of the heat pump system according to claim 10, wherein after the refrigerant heater is turned on, continue to detect the temperature difference between the two ends of the second flow path and determine whether the temperature difference is less than the second set temperature difference T3;

If the temperature difference reaches the second set temperature difference T3, turn off the refrigerant heater; if the temperature difference is less than the second set temperature difference T3, control the refrigerant heater to continue heating until the temperature difference reaches the second set temperature After a difference of T3, the refrigerant heater is turned off.