CN107192012A - Splitting heat pump air conditioner and the method for delaying its frosting - Google Patents

Abstract

The embodiment of the present invention discloses a split-type heat pump air conditioner, which includes a controller and an outdoor unit with a compressor and an outdoor heat exchanger. The air port or the air inlet is connected, and a bypass pipeline is set between the exhaust port of the compressor and the gas flow port of the outdoor heat exchanger, and a solenoid valve is set on the bypass line; the gas flow port is equipped with a pressure sensor, It is used to detect the air pressure of the gas flow port; the controller receives the air pressure value Ps detected by the air pressure sensor in the heating mode, and adjusts the opening of the solenoid valve according to the air pressure value Ps detected by the air pressure sensor, so that the air pressure of the gas flow port is greater than Or equal to the set air pressure value P0, which can effectively delay the frosting of the outdoor unit, so the present invention can solve the problem of how to delay the frosting of the outdoor unit when the split heat pump air conditioner is used for heating.

Description

Split heat pump air conditioner and method for delaying its frosting

technical field

The invention relates to the technical field of air conditioners, in particular to a split heat pump air conditioner and a method for delaying its frosting.

Background technique

When the split heat pump air conditioning system is heating, when the outdoor ambient temperature is lower than freezing point, the water vapor in the air will condense on the surface of the heat exchanger, and as time changes, a frost layer will form on the surface of the heat exchanger. Frosting directly increases the heat transfer resistance between the surface of the heat exchanger and the flowing air, which reduces the air flow through the heat exchanger and reduces the heat exchange efficiency, resulting in a decrease in the heat transfer of the system and the heating condition of the system. deteriorating and measures to defrost are required.

In the prior art, measures are generally taken to remove the frost after the outdoor unit of the air conditioner is frosted. Generally, the control mode of indoor cooling and outdoor heating is used to defrost. Therefore, when the outdoor unit frosts, it will affect the indoor heating effect , and the defrosting process will also seriously affect the indoor heating effect and reduce the comfort of the human body.

Contents of the invention

Embodiments of the present invention provide a split heat pump air conditioner and a method for delaying its frosting, aiming at solving the problem of how to delay the frosting of an outdoor unit when the split heat pump air conditioner is used for heating. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. This summary is not an overview, nor is it intended to identify key/critical elements or delineate the scope of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

According to the first aspect of the embodiment of the present invention, there is provided a split heat pump air conditioner, including a controller and an outdoor unit with a compressor and an outdoor heat exchanger. The outdoor heat exchanger has a gas flow port, and the gas flow port passes through a The through valve is in communication with the exhaust port or air return port of the compressor, and there is a bypass pipeline between the exhaust port of the compressor and the gas circulation port of the outdoor heat exchanger, and a solenoid valve is arranged on the bypass pipeline; the gas circulation An air pressure sensor is installed at the air flow port to detect the air pressure at the gas flow port; the controller receives the air pressure value Ps detected by the air pressure sensor in the heating mode, and adjusts the opening of the solenoid valve according to the air pressure value Ps detected by the air pressure sensor, so that The air pressure of the gas flow port is greater than or equal to the set air pressure value P0. The setting of P0 is related to the outdoor ambient temperature. The value of P0 is inversely proportional to the outdoor ambient temperature. When the outdoor ambient temperature is high and the outdoor unit is not prone to frost, P0 can be set smaller. When the outdoor ambient temperature is low and the outdoor unit is prone to frost during the heating process, P0 can be set larger. When the air pressure at the gas flow port of the outdoor heat exchanger is greater than P0, it can be determined that the pressure at the gas flow port is high, the surface temperature of the outdoor heat exchanger is high, and the outdoor unit is not prone to frosting.

According to the second aspect of the embodiments of the present invention, there is provided a method for delaying frosting of a split heat pump air conditioner, the split heat pump air conditioner includes an outdoor unit having a compressor and an outdoor heat exchanger, and the outdoor heat exchanger has a gas flow port , the gas flow port communicates with the high-pressure exhaust port or return port of the compressor through a four-way valve, and a bypass pipeline is also set between the exhaust port of the compressor and the gas flow port of the outdoor heat exchanger. A solenoid valve is arranged on the pipeline; the method includes: detecting the air pressure value Ps of the gas flow port in the heating mode; adjusting the opening of the solenoid valve according to the air pressure value Ps, so that the air pressure of the gas flow port is greater than or equal to the set pressure value P0.

In the present invention, when the air conditioner is in the heating mode, the gas flow port of the outdoor heat exchanger communicates with the air return port of the compressor, and a bypass pipeline is also provided between the exhaust port of the compressor and the gas flow port of the outdoor heat exchanger , so the high-temperature and high-pressure gas at the exhaust port of the compressor can flow to the gas flow port of the outdoor heat exchanger through the bypass pipeline. The flow of high-temperature and high-pressure gas flowing from the exhaust port of the machine to the gas flow port of the outdoor heat exchanger, so that the air pressure of the gas flow port is greater than or equal to the set pressure value P0, so that the pressure of the gas flow port of the outdoor heat exchanger can always be maintained In a higher range, the internal pressure of the outdoor heat exchanger is higher and the surface temperature is higher, which effectively delays the frosting of the outdoor unit. Therefore, the present invention can solve the problem of how to delay the frosting of the outdoor unit when the split heat pump air conditioner is used for heating. question.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

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

2 is a schematic structural view of a controller of a split heat pump air conditioner according to an embodiment of the present invention;

Fig. 3 is a flowchart of a method for delaying frosting of a split-type heat pump air conditioner according to an embodiment of the present invention;

Fig. 4 is a flowchart of a method for delaying frosting of a split-type heat pump air conditioner according to an embodiment of the present invention.

Description of reference signs: 10, controller; 11, calculation unit; 12, judgment unit; 13, adjustment unit; 20, compressor; 21, exhaust port; 22, return air port; 30, four-way valve; 40, outdoor Heat exchanger; 41, gas circulation port; 42, liquid inlet; 50, air pressure sensor; 60, solenoid valve; 70, indoor heat exchanger; 71, air inlet; 72, liquid outlet.

detailed description

The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. Herein, various embodiments may be referred to individually or collectively by the term "invention", which is for convenience only and is not intended to automatically limit the scope of this application if in fact more than one invention is disclosed. A single invention or inventive concept. Herein, relational terms such as first and second etc. are used only to distinguish one entity from another without requiring or implying any actual relationship or order between these entities. Moreover, the terms "comprises", "comprises" or any other variation thereof are intended to cover a non-exclusive inclusion such that the inclusion of a list of elements includes not only those elements but also other elements not expressly listed. Various embodiments herein are described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of the various embodiments may be referred to each other. As for the structures, products, etc. disclosed in the embodiments, since they correspond to the parts disclosed in the embodiments, the description is relatively simple, and for relevant parts, please refer to the description of the method part.

The first embodiment of the present invention provides a split-type heat pump air conditioner, which includes a controller 10 and an outdoor unit with a compressor 20 and an outdoor heat exchanger 40. The outdoor heat exchanger 40 has a gas flow port 41, and the gas flow port 41 passes through a The four-way valve 30 communicates with the exhaust port 21 or the air return port 22 of the compressor 20, and a bypass pipeline is also provided between the exhaust port 21 of the compressor 20 and the gas circulation port 41 of the outdoor heat exchanger 40, and the bypass The pipeline is provided with a solenoid valve 60; the gas flow port 41 is provided with an air pressure sensor 50 for detecting the air pressure at the gas flow port 41; the controller 10 receives the air pressure value Ps detected by the air pressure sensor 50 in the heating mode, and according to The air pressure value Ps detected by the air pressure sensor 50 adjusts the opening degree of the solenoid valve 60 .

Wherein, the setting of P0 is related to the outdoor ambient temperature. The value of P0 is inversely proportional to the outdoor ambient temperature. When the outdoor ambient temperature is high and the outdoor unit is not prone to frost, P0 can be set smaller. When the outdoor ambient temperature is low and the outdoor unit is prone to frost during the heating process, P0 can be set larger. When the air pressure at the gas flow port 41 of the outdoor heat exchanger 40 is greater than P0, it can be determined that the pressure at the gas flow port 41 is high, the surface temperature of the outdoor heat exchanger 40 is high, and the outdoor unit is not likely to be frosted.

Wherein, the value range of P0 is the corresponding evaporation pressure when the saturated evaporation temperature Ts of the refrigerant is 0-2° C., and the saturated evaporation temperature Ts refers to the temperature of the refrigerant in a gas-liquid saturated state. The value of P0 is related to the type of refrigerant selected. Different refrigerants have different values of P0. For example, when the Ts of R22 refrigerant is 0°C, the corresponding pressure value is 0.35Mpa.

In the present invention, when the air conditioner operates in the heating mode, the gas circulation port 41 of the outdoor heat exchanger 40 communicates with the air return port 22 of the compressor 20 through the four-way valve 30, and the exhaust port 21 of the compressor 20 communicates with the outdoor heat exchanger. The gas flow port 41 of 40 is also provided with a bypass line, so the high temperature and high pressure gas at the exhaust port 21 of the compressor 20 can flow to the gas flow port 41 of the outdoor heat exchanger 40 through the bypass line, and the bypass line is set There is a solenoid valve 60, and the controller 10 is used to receive the pressure at the gas flow port 41 detected by the air pressure sensor 50. The controller 10 is also used to adjust the opening of the solenoid valve 60, that is, to control the flow from the exhaust port 21 of the compressor 20 to The flow rate of the high-temperature and high-pressure gas in the gas flow port 41 of the outdoor heat exchanger 40 makes the air pressure of the gas flow port 41 greater than or equal to the set pressure value P0, so that the pressure of the gas flow port 41 of the outdoor heat exchanger 40 can be maintained at all times. In a higher range, the internal pressure of the outdoor heat exchanger 40 is higher, and the surface temperature is higher, effectively delaying the frosting of the outdoor unit, so the present invention can solve how to delay the frosting of the outdoor unit when the split heat pump air conditioner is used for heating The problem.

As shown in FIG. 1 , a split heat pump air conditioner in this embodiment includes a controller 10 , a compressor 20 , a four-way valve 30 , an outdoor heat exchanger 40 , an indoor heat exchanger 70 , an air pressure sensor 50 and a solenoid valve 60 , in the heating mode, the air return port 22 of the compressor 20 is connected to the gas circulation port 41 of the outdoor heat exchanger 40 through the four-way valve 30 , and the exhaust port 21 of the compressor 20 is connected to the indoor heat exchanger 70 through the four-way valve 30 The inlet 71 of the indoor heat exchanger 70 is connected to the inlet 71 of the indoor heat exchanger 70, and the outlet 72 of the indoor heat exchanger 70 is connected to the inlet 42 of the outdoor heat exchanger 40 through a throttle valve (not shown in the figure). Therefore, in the heating mode, the outdoor heat exchange The evaporator 40 is used as an evaporator, and the indoor heat exchanger 70 is used as a condenser. A bypass pipeline is provided between the gas flow port 41 of the outdoor heat exchanger 40 and the exhaust port 21 of the compressor 20, and the bypass pipeline is provided with There is a solenoid valve 60, and the gas flow port 41 of the outdoor heat exchanger 40 is provided with an air pressure sensor 50 for detecting the air pressure at the gas flow port 41, and the controller 10 receives the air pressure value Ps detected by the air pressure sensor 50 in the heating mode. , and adjust the opening of the solenoid valve 60 according to the air pressure value Ps detected by the air pressure sensor 50, so that the air pressure of the gas flow port 41 is greater than or equal to the set air pressure value P0.

Wherein, the setting of the set air pressure value P0 is as described above, and will not be repeated here. In this embodiment, when the air conditioner is used for heating, the air outlet 21 of the compressor 20 and the inlet of the indoor heat exchanger 70 The gas port 71 is connected, and the high-temperature and high-pressure gaseous refrigerant releases heat in the indoor heat exchanger 70 for heating. The liquid outlet 72 of the indoor heat exchanger 70 is connected to the liquid inlet 42 of the outdoor heat exchanger 40 through a throttle valve. The liquid refrigerant at normal temperature and pressure absorbs heat and vaporizes in the outdoor heat exchanger 40, and enters the interior of the compressor 20 through the four-way valve 30 from the air return port 22 of the compressor 20 to be compressed and reused. It is used to absorb heat. When the pressure of the refrigerant in the outdoor heat exchanger 40 is low, the temperature inside the outdoor heat exchanger 40 is low, and the surface of the outdoor heat exchanger 40 is prone to frosting. A bypass pipeline is provided between the air port 21 and the gas circulation port 41, and a solenoid valve 60 is arranged on the bypass pipeline, and the opening of the solenoid valve 60 is adjustable. 50 is used to detect the air pressure Ps at the gas flow port 41. In the heating mode, the controller 10 is also used to receive Ps and adjust the opening of the solenoid valve 60 according to Ps so that the air pressure at the gas flow port 41 is greater than or equal to the set value. Constant air pressure value P0 keeps the air pressure at the gas flow port 41 in a relatively high range. Since the refrigerant flows from the liquid inlet 42 of the outdoor heat exchanger 40 to the gas flow port 41, and the refrigerant is under pressure Therefore, when the pressure at the gas outlet 41 of the outdoor heat exchanger 40 is higher, the pressure at the liquid inlet 42 of the outdoor heat exchanger 40 is also higher, so that the pressure in the outdoor heat exchanger 40 is higher , the temperature is higher, which can effectively delay the frosting of the outdoor unit.

In the above-mentioned embodiment, the controller 10 adjusts the opening degree of the solenoid valve 60 according to the air pressure value Ps detected by the air pressure sensor 50. The pressure difference ΔP between the air pressure value Ps and the set air pressure value P0 adjusts the opening degree of the solenoid valve 60 . The controller 10 adjusts the opening of the solenoid valve 60 according to the pressure difference ΔP between Ps and P0, which makes the control method simple to calculate and convenient to control.

Optionally, in the above embodiment, as shown in FIG. 2 , the controller 10 further includes: a calculation unit 11 for calculating the pressure difference ΔP between the air pressure value Ps detected by the air pressure sensor 50 and the set air pressure value P0 the judging unit 12 is used to judge the area where the pressure difference ΔP is located; and the adjusting unit 13 is used to adjust the opening degree of the solenoid valve 60 corresponding to the area where the pressure difference ΔP is located. In this embodiment, the pressure difference ΔP is calculated by the calculation unit 11, and then the area where the pressure difference ΔP is determined by the judging unit 12, and finally the opening of the solenoid valve 60 is adjusted according to the area where the pressure difference ΔP is located. Therefore, by calculating Unit 11 , judging unit 12 and adjusting unit 13 , the controller 10 can adjust the opening degree of the solenoid valve 60 according to the pressure difference ΔP, and can ensure that the opening degree of the solenoid valve 60 corresponds to the area where the pressure difference ΔP is located.

Optionally, in the above-mentioned embodiment, there are many ways for the adjustment unit 13 to adjust the solenoid valve 60 to the opening corresponding to the area where the pressure difference ΔP is located. As an optional way, when the pressure difference ΔP is greater than When the pressure difference ΔP is less than the first set value A1 but greater than or equal to the second set value A2, the adjustment unit 13 will open the solenoid valve 60 The degree of adjustment is 1/4; when the pressure difference ΔP is less than the second set value A2 but greater than or equal to the third set value A3, the adjustment unit 13 adjusts the opening of the solenoid valve 60 to 1/2; when the pressure difference ΔP When it is less than the third set value A3 but greater than or equal to the fourth set value A4, the adjustment unit 13 adjusts the opening of the solenoid valve 60 to 3/4; when the pressure difference ΔP is less than the fourth set value A4, the adjustment unit 13 Open all the solenoid valves 60; wherein, A1>A2>A3>A4>0. Among them, A1 can take a value between 0.04 ~ 0.05Mpa. The value of A1 is related to the safe temperature of the saturation temperature of the evaporator. When the difference between the temperature at the gas circulation port 41 and the saturated evaporation temperature Ts is greater than or equal to the safe temperature, Frosting will definitely not occur on the surface of the outdoor heat exchanger 40, and the safe temperature is generally set at 4-5°C. If the safe temperature is too low, it cannot be guaranteed that when the difference between the temperature at the gas flow port 41 and the saturated evaporation temperature Ts is greater than or When the temperature is equal to the safe temperature, there will be no frost on the surface of the outdoor heat exchanger 40. If the safe temperature is too high, it will seriously affect the heating effect of the air conditioner; A1 is the pressure of the refrigerant corresponding to the safe temperature. When the pressure difference ΔP When it is greater than or equal to A1, it means that the pressure at the gas circulation port 41 is very high. At this time, the outdoor heat exchanger 40 will not frost, and there is no need to send high temperature from the exhaust port 21 of the compressor 20 to the gas circulation port 41. High-pressure gaseous refrigerant, so the regulating unit 13 closes the solenoid valve 60; the value of A2 is related to the setting of the opening area of the solenoid valve 60 and the pressure of the refrigerant corresponding to the safe temperature. In this embodiment, the solenoid valve 60 is set to 4 The pressure of the refrigerant corresponding to the safe temperature is 0.04-0.05Mpa, and the opening range of the solenoid valve 60 corresponds to the pressure adjustment area of 0.01Mpa-0.0125Mpa. Therefore, A2 can subtract a pressure adjustment area from A1 For example, A2 can take a value between 0.03 and 0.04Mpa. When the pressure difference ΔP is less than A1 and greater than or equal to A2, it means that although the current pressure at the gas flow port 41 is relatively high, it is still not enough. To meet the requirement of no frosting, the adjustment unit 13 adjusts the opening of the solenoid valve 60 to 1/4, and controls the delivery of less high-temperature and high-pressure gaseous refrigerant, which can meet the requirement greater than or equal to the set pressure value P0, so that the gas The pressure at the flow port 41 is always greater than or equal to P0, delaying the frosting of the outdoor unit; A3 can be set within the range of A1 minus the two pressure adjustment areas, for example, A3 can be set between 0.02-0.03Mpa When the pressure difference ΔP is less than the second set value A2 but greater than or equal to the third set value A3, it means that the current pressure at the gas flow port 41 is low, so the adjustment unit 13 adjusts the opening of the solenoid valve 60 to 1/2, so that the exhaust port 21 of the compressor 20 discharges more high-temperature and high-pressure gaseous refrigerant to the gas circulation port 41, so that the pressure at the gas circulation port 41 is always greater than or equal to P0, and delays frosting of the outdoor unit; A4 can Take the value within the range of A3 minus the three adjustment areas, for example, A3 can take a value between 0 and 0.02Mpa, when the pressure difference ΔP is less than the third set value A3 but greater than or equal to the fourth set value When A4, it means that the pressure at the gas flow port 41 is very low, the adjustment unit 13 adjusts the opening of the solenoid valve 60 to 3/4, so that the pressure at the gas flow port 41 is always greater than or equal to P0, and the frosting of the outdoor unit is delayed; When the pressure difference ΔP is less than A4, it is considered that the gas flow port 41 The pressure is extremely low, and the regulating unit 13 fully opens the solenoid valve 60, and replenishes a large amount of high-temperature and high-pressure gaseous refrigerant from the exhaust port 21 of the compressor 20 to the gas circulation port, so that the pressure at the gas circulation port 41 is always greater than or equal to P0, delaying The outdoor unit is frosted.

Optionally, in any of the above embodiments, a temperature sensor (not shown in the figure) is also included, the temperature sensor is located near the gas flow port 41, and is used to detect the temperature Te at the gas flow port 41, so The controller 10 is also used to adjust the values of A1, A2, A3 and A4 according to the difference ΔT between Te and the saturated evaporation temperature Ts. As an optional implementation manner, the values of A1 , A2 , A3 and A4 when ΔT≧0 are respectively smaller than the values of A1 , A2 , A3 and A4 when ΔT<0. Further optionally, when ΔT≥0, A1 takes a value of 0.04Mpa, A2 takes a value of 0.03Mpa, A3 takes a value of 0.02Mpa, and A4 takes a value of 0Mpa; when ΔT<0, A1 takes a value of 0.05Mpa, and A2 takes a value of 0.04 Mpa, the value of A3 is 0.03Mpa, and the value of A4 is 0.02Mpa. In this embodiment, the controller 10 can also adjust the values of A1, A2, A3 and A4 according to the difference between Te and Ts, so as to make the control of the air conditioner more precise. where ΔT=Te−Ts.

The second embodiment of the present invention discloses a method for delaying the split heat pump air conditioner in any of the above embodiments, as shown in Figure 3, the control method includes:

Step S301: Detect the pressure value Ps of the gas flow port in the heating mode.

Step S302: Adjust the opening of the solenoid valve according to the air pressure value Ps.

Wherein, the setting of the set air pressure value P0 is as described above, and will not be repeated here. In the present invention, when the air conditioner operates in the heating mode, the gas circulation port of the outdoor heat exchanger communicates with the air return port of the compressor through the four-way valve, and the exhaust port of the compressor is also provided with the gas circulation port of the outdoor heat exchanger. Bypass pipeline, so the high-temperature and high-pressure gas at the exhaust port of the compressor can flow to the gas flow port of the outdoor heat exchanger 40 through the bypass pipeline. A solenoid valve is installed on the bypass pipeline, and the air conditioner is in the heating mode through step S301. Next, detect the air pressure value PS at the gas flow port, and then adjust the opening of the solenoid valve through step S302, so that the air pressure of the gas flow port is greater than or equal to the set pressure value P0, so that the pressure of the gas flow port of the outdoor heat exchange can be 0 It is always kept within a relatively large range, so that the internal pressure of the outdoor heat exchanger is relatively high, and the surface temperature is relatively high, which effectively delays the frosting of the outdoor unit. Frost problem.

Optionally, in the above embodiment, step S302 further includes: adjusting the opening degree of the solenoid valve according to the pressure difference ΔP between the air pressure value Ps and the set air pressure value P0. The air conditioner adjusts the opening of the solenoid valve according to the pressure difference ΔP between PS and P0, which makes the control method simple to calculate and convenient to control.

Optionally, in the foregoing embodiment, as shown in FIG. 4, step S302 further includes:

Step S3021: Calculate the pressure difference ΔP between the air pressure value Ps and the set air pressure value P0.

Step S3022: Determine the area where the pressure difference ΔP is located.

Step S3023: Adjust the solenoid valve to an opening corresponding to the area where the pressure difference ΔP is located.

In this embodiment, the air conditioner can calculate the differential pressure ΔP through step S3021, determine the area where the differential pressure ΔP is located through step S3022, and adjust the opening of the solenoid valve according to the area where the differential pressure ΔP is located through step S3023. Through this embodiment, the air conditioner can adjust the opening degree of the electromagnetic valve according to the pressure difference ΔP, and can ensure that the opening degree of the electromagnetic valve corresponds to the area where the pressure difference ΔP is located.

Optionally, in the above embodiment, step S3023 specifically includes: closing the solenoid valve when the pressure difference ΔP is greater than or equal to the first set value A1; When the second set value A2, adjust the opening of the solenoid valve to 1/4; when the pressure difference ΔP is less than the second set value A2 but greater than or equal to the third set value A3, adjust the opening of the solenoid valve to 1/2; when the pressure difference ΔP is less than the third set value A3 but greater than or equal to the fourth set value A4, adjust the opening of the solenoid valve to 3/4; when the pressure difference ΔP is less than the fourth set value A4 , open all the solenoid valves; among them, A1>A2>A3>A4>0. The setting of A1 is as above, and will not be repeated here. When the pressure difference ΔP is greater than or equal to A1, it means that the pressure at the gas flow port 41 is very high. The gaseous refrigerant of high temperature and high pressure is delivered from the exhaust port 21 to the gas circulation port 41, and the outdoor heat exchanger 40 will not be frosted; the setting of A2 is as above, and will not be repeated here. When the pressure difference ΔP If it is less than A1 and greater than or equal to A2, it means that although the current pressure at the gas flow port 41 cannot meet the requirement of no frosting, it is still relatively high. Therefore, the air conditioner adjusts the opening of the solenoid valve 60 to 1/4. Less high-temperature and high-pressure gaseous refrigerant can meet the requirement of greater than or equal to the set air pressure value P0, so that the pressure at the gas flow port 41 is always greater than or equal to P0, delaying the frosting of the outdoor unit; wherein, the setting of A3 is as above It will not be repeated here. When the pressure difference ΔP is less than the second set value A2 but greater than or equal to the third set value A3, it means that the current pressure at the gas flow port 41 is low, and the air conditioner will open the solenoid valve 60 Adjust the speed to 1/2, so that the compressor 20 exhaust port 21 discharges more high-temperature and high-pressure gaseous refrigerant to the gas circulation port 41, so that the pressure at the gas circulation port 41 is always greater than or equal to P0, and delays frosting of the outdoor unit; The setting of A4 is as above, and will not be repeated here. When the pressure difference ΔP is less than the third set value A3 but greater than or equal to the fourth set value A4, it means that the pressure at the gas flow port 41 is very low, and the air conditioner will The opening of the solenoid valve 60 is adjusted to 3/4, so that the pressure at the gas flow port 41 is always greater than or equal to P0, delaying the frosting of the outdoor unit; when the pressure difference ΔP is less than A4, it is considered that the pressure at the gas flow port 41 is extremely low , the air conditioner fully opens the solenoid valve 60, and the air conditioner controls to replenish a large amount of high-temperature and high-pressure gaseous refrigerant from the exhaust port 21 of the compressor 20 to the gas circulation port, so that the pressure at the gas circulation port 41 is always greater than or equal to P0, and delays the outdoor unit. Frost.

Optionally, in any of the above embodiments, the values of A1, A2, A3 and A4 are adjusted according to the difference ΔT between the temperature Te at the gas flow port 41 and the saturated evaporation temperature Ts. As an optional implementation manner, the values of A1, A2, A3 and A4 when ΔT≥0 are smaller than the values of A1, A2, A3 and A4 when ΔT<0. Further optional, when ΔT≥0, A1 takes 0.04Mpa, A2 takes 0.03Mpa, A3 takes 0.02Mpa, A4 takes 0Mpa; when ΔT<0, A1 takes 0.05Mpa, A2 takes 0.04Mpa, The value of A3 is 0.03Mpa, and the value of A4 is 0.02Mpa. In this embodiment, the values of A1, A2, A3 and A4 are adjusted according to the difference between Te and Ts, so that the control of the air conditioner is more precise. where ΔT=Te−Ts.

It should be understood that the present invention is not limited to the processes and structures that have been described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (10)

1. a kind of splitting heat pump air conditioner, including controller and the outdoor unit with compressor and outdoor heat converter, the room Outer heat-exchanger has gas communication port, and the gas communication port is by a four-way valve and the exhaust outlet or return-air of the compressor Mouth connection, it is characterised in that also set up between the exhaust outlet of the compressor and the gas communication port of the outdoor heat converter Have and be provided with magnetic valve on bypass line, the bypass line；The gas communication port is provided with baroceptor, for detecting The air pressure of the gas communication port；The controller receives the atmospheric pressure value that the baroceptor is detected in a heating mode Ps, and the atmospheric pressure value Ps detected according to the baroceptor adjusts the aperture of the magnetic valve.

2. splitting heat pump air conditioner as claimed in claim 1, it is characterised in that the controller is according to the baroceptor Pressure differential deltap P between the atmospheric pressure value Ps and the setting atmospheric pressure value P0 that detect adjusts the aperture of the magnetic valve.

3. splitting heat pump air conditioner as claimed in claim 2, it is characterised in that the controller includes：

Computing unit, for calculating the pressure between the atmospheric pressure value Ps and the setting atmospheric pressure value P0 that the baroceptor detects Poor Δ P；

Judging unit, for judging the region where the pressure differential deltap P；With,

Adjustment unit, for by the electromagnetism valve regulation to corresponding to the pressure differential deltap P regions aperture.

4. splitting heat pump air conditioner as claimed in claim 3, it is characterised in that

When the pressure differential deltap P is more than or equal to the first setting value A1, the adjustment unit closes the magnetic valve；

When the pressure differential deltap P is less than the first setting value A1 but is more than or equal to the second setting value A2, the adjustment unit It is 1/4 by the aperture regulation of the magnetic valve；

When the pressure differential deltap P is less than the second setting value A2 but is more than or equal to the 3rd setting value A3, the adjustment unit It is 1/2 by the aperture regulation of the magnetic valve；

When the pressure differential deltap P is less than the 3rd setting value A3 but is more than or equal to the 4th setting value A4, the adjustment unit It is 3/4 by the aperture regulation of the magnetic valve；

When the pressure differential deltap P is less than the 4th setting value A4, the adjustment unit is fully open by the magnetic valve；Its In, A1 ＞ A2 ＞ A3 ＞ A4 ＞ 0.

5. splitting heat pump air conditioner as claimed in claim 4, it is characterised in that also include：

Temperature sensor, the temperature sensor is located at the gas communication port, the temperature Te for detecting gas communication port, The controller is additionally operable to adjust the first setting value A1, the second setting according to the temperature Te and saturation evaporating temperature Ts difference Value A2, the 3rd setting value A3 and the 4th setting value A4 value.

6. a kind of method for being used to delay splitting heat pump air conditioner frosting, it is characterised in that methods described includes：

The atmospheric pressure value Ps of the gas communication port is detected in a heating mode；

The aperture of the magnetic valve is adjusted according to the atmospheric pressure value Ps.

7. method as claimed in claim 5, it is characterised in that according between the atmospheric pressure value Ps and the setting atmospheric pressure value P0 Pressure differential deltap P adjust the aperture of the magnetic valve.

8. method as claimed in claim 6, it is characterised in that the pressure according between atmospheric pressure value Ps and setting atmospheric pressure value P0 The aperture of poor Δ P electromagnetic valve for adjusting, including：

Calculate the pressure differential deltap P between the atmospheric pressure value Ps and the setting atmospheric pressure value P0；

Judge the region where the pressure differential deltap P；With,

By the electromagnetism valve regulation to the aperture corresponding to the pressure differential deltap P regions.

9. method as claimed in claim 7, it is characterised in that it is described by electromagnetism valve regulation to corresponding to pressure differential deltap P locations The aperture in domain, including：

When the pressure differential deltap P is more than or equal to the first setting value A1, the magnetic valve is closed；

When the pressure differential deltap P is less than the first setting value A1 but is more than or equal to the second setting value A2, by the magnetic valve Aperture regulation be 1/4；

When the pressure differential deltap P is less than the second setting value A2 but is more than or equal to the 3rd setting value A3, by the magnetic valve Aperture regulation be 1/2；

When the pressure differential deltap P is less than the 3rd setting value A3 but is more than or equal to the 4th setting value A4, by the magnetic valve Aperture regulation be 3/4；

It is when the pressure differential deltap P is less than the 4th setting value A4, the magnetic valve is fully open；Wherein, A1 ＞ A2 ＞ A3 ＞ A4 ＞ 0.

10. method as claimed in claim 9, it is characterised in that also include：

Set according to the difference of the temperature at gas communication port and saturation evaporating temperature regulation the first setting value A1, described second Definite value A2, the 3rd setting value A3 and the 4th setting value A4 value.