CN114992803B

CN114992803B - Control method and device for air supplementing and enthalpy increasing of heat pump air conditioner and heat pump air conditioner

Info

Publication number: CN114992803B
Application number: CN202210602721.4A
Authority: CN
Inventors: 姜瑞龙; 张宝库; 邬黔凤; 柯梦卿
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Filing date: 2022-05-30
Publication date: 2024-07-09
Anticipated expiration: 2042-05-30

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a control method for air supplementing and enthalpy increasing of a heat pump air conditioner, wherein the heat pump air conditioner comprises a heating circulation loop and an air supplementing and enthalpy increasing loop, and a main electronic expansion valve is arranged on the heating circulation loop; the air supplementing enthalpy increasing loop is connected in parallel between the indoor side heat exchanger of the heating circulation loop and the compressor and is used for supplementing air for the compressor; the air supplementing and enthalpy increasing loop is provided with an air supplementing electronic expansion valve; the control method comprises the following steps: under the condition that the heat pump air conditioner executes the air-supplementing enthalpy-increasing control instruction, controlling the air-supplementing enthalpy-increasing loop to be in a conducting state, and controlling the air-supplementing electronic expansion valve to be opened to a preset opening degree; obtaining the exhaust temperature change rate of the compressor; and adjusting the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve according to the exhaust temperature change rate. The method enables the system to run towards steady state operation, and improves the heating capacity of the system in a low-temperature environment. The application also discloses a control device for air supplementing and enthalpy increasing of the heat pump air conditioner and the heat pump air conditioner.

Description

Control method and device for air supplementing and enthalpy increasing of heat pump air conditioner and heat pump air conditioner

Technical Field

The application relates to the technical field of intelligent household appliances, in particular to a control method and device for air supplementing and enthalpy increasing of a heat pump air conditioner and the heat pump air conditioner.

Background

The air source heat pump air conditioner uses air as a low-temperature heat source, and drives a compressor to operate through a small amount of electric energy, so that low-level heat energy in the air is improved to high-level heat energy to heat a user. The heat pump air conditioner has the characteristics of high efficiency, environmental protection and the like, but under the low-temperature and ultralow-temperature environment, the heat pump air conditioner has the conditions of overlarge compression ratio of a compressor, overlarge evaporation temperature and overlarge exhaust temperature. This results in a deterioration of the heating capacity of the unit, which in turn affects the heating effect.

In the related art, a gas-supplementing enthalpy-increasing system and a control method thereof are disclosed, wherein the gas-supplementing enthalpy-increasing system comprises a gas-supplementing enthalpy-increasing compressor, a four-way valve, a water side heat exchanger, an air side heat exchanger, an economizer, an electromagnetic valve, a first electronic expansion valve and a second electronic expansion valve; the first outlet of the economizer is connected with one end, far away from the four-way valve, of the air side heat exchanger through the first electronic expansion valve, and the second outlet of the economizer is connected with a pipeline between the first outlet of the economizer and the first electronic expansion valve through the second electronic expansion valve. The control method comprises the step of adjusting the states of the electronic expansion valve and the electromagnetic valve according to the temperatures of the exhaust port, the air supplementing port and the second outlet of the economizer of the compressor.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

In the related art, the air supplementing enthalpy increasing control mainly controls the opening of the second electronic expansion valve to adjust the flow of the refrigerant entering the economizer. But the effect of supplementing air and increasing enthalpy is poor, and the system is difficult to stably run.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a control method and device for air supplementing and enthalpy increasing of a heat pump air conditioner and the heat pump air conditioner, so as to improve the effect of air supplementing and enthalpy increasing and realize stable operation of an air conditioning system.

In some embodiments, the heat pump air conditioner comprises a heating circulation loop and an air supplementing enthalpy increasing loop, wherein a main electronic expansion valve is arranged on the heating circulation loop; the air supplementing enthalpy increasing loop is connected in parallel between the indoor side heat exchanger of the heating circulation loop and the compressor and is used for supplementing air for the compressor; the air supplementing and enthalpy increasing loop is provided with an air supplementing electronic expansion valve; the control method comprises the following steps: under the condition that the heat pump air conditioner executes the air-supplementing enthalpy-increasing control instruction, controlling the air-supplementing enthalpy-increasing loop to be in a conducting state, and controlling the air-supplementing electronic expansion valve to be opened to a preset opening degree; obtaining the exhaust temperature change rate of the compressor; and adjusting the opening of the air supplementing electronic expansion valve and the opening of the heating electronic expansion valve according to the exhaust temperature change rate.

In some embodiments, the apparatus comprises: comprising a processor and a memory storing program instructions, the processor being configured to execute the control method for air-supplementing and enthalpy-increasing of a heat pump air conditioner as described above when the program instructions are executed.

In some embodiments, the heat pump air conditioner includes: the heating circulation loop comprises a main electronic expansion valve; the air supplementing and enthalpy increasing loop comprises an air supplementing electronic expansion valve; the air supplementing and enthalpy increasing loop is connected in parallel between the indoor side heat exchanger and the compressor; the device is used for supplementing air and increasing enthalpy for the compressor; and the control device for supplementing air and increasing enthalpy of the heat pump air conditioner.

The control method and device for air supplementing and enthalpy increasing of the heat pump air conditioner and the heat pump air conditioner provided by the embodiment of the disclosure can realize the following technical effects:

in the embodiment of the disclosure, under the condition that the heat pump air conditioner needs to perform air supplementing and enthalpy increasing, the air supplementing and enthalpy increasing loop is controlled to be conducted, and the air supplementing electronic expansion valve is controlled to be opened to a preset opening degree. And then according to the exhaust temperature change rate, the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve are adjusted. The exhaust temperature is adjusted by adjusting the flow of the refrigerant at the air supplementing port of the compressor. Therefore, the system runs towards steady state operation, and the heating capacity of the system in a low-temperature environment is improved.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

Fig. 1 is a schematic structural view of a heat pump air conditioner provided in an embodiment of the present disclosure;

fig. 2 is a schematic structural view of a defrosting pipe of a heat pump air conditioner according to an embodiment of the present disclosure;

Fig. 3 is a schematic diagram of a control method for air-supplementing and enthalpy-increasing of a heat pump air conditioner according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a method for adjusting the opening of a gas-make-up electronic expansion valve and a main electronic expansion valve in the method provided by the embodiments of the present disclosure;

fig. 5 is a schematic diagram of another control method for air-supplementing and enthalpy-increasing of a heat pump air conditioner according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of another control method for air-supplementing and enthalpy-increasing of a heat pump air conditioner according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of another control method for air-supplementing and enthalpy-increasing of a heat pump air conditioner according to an embodiment of the present disclosure;

FIG. 8 is a schematic illustration of an application of an embodiment of the present disclosure;

fig. 9 is a schematic diagram of a control method apparatus for air-supplementing and enthalpy-increasing of a heat pump air conditioner according to an embodiment of the disclosure.

Description of the drawings:

10. A compressor; 20. a four-way valve; 30. an indoor side heat exchanger; 40. an economizer; 50. an outdoor side heat exchanger; 60. a main electronic expansion valve; 70. an electronic expansion valve for supplementing air; 80. an electromagnetic valve; 90. a filter; 11. an electric heating belt; 51. a defrosting pipe; 52. a chassis.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.

Referring to fig. 1, the heat pump air conditioner includes a heating cycle circuit and a supplementary air enthalpy circuit. The heating cycle includes a compressor 10, a four-way valve 20, an indoor side heat exchanger 30, an economizer 40, a filter 90, a main electronic expansion valve 60, and an outdoor side heat exchanger 50. Specifically, the compressor 10 has an exhaust port connected to the four-way valve 20, and the four-way valve 20 is connected to an inlet of the indoor-side heat exchanger 30. The outlet of the indoor side heat exchanger 30 is connected to the first inlet a of the economizer 40, the first outlet B of the economizer 40 is connected to the first inlet a, and the first outlet B is connected to the inlet of the outdoor side heat exchanger 50 through the main electronic expansion valve 60. The outlet of the outdoor heat exchanger 50 is connected to the return air port of the compressor 10 through the four-way valve 20.

The air supplementing and enthalpy increasing loop is connected in parallel between the indoor side heat exchanger 30 and the compressor 10 of the heating circulation loop. The air make-up enthalpy circuit includes a solenoid valve 80, an air make-up electronic expansion valve 70, and an economizer 40. Specifically, the outlet of the indoor side heat exchanger 30 is divided into two paths, one of which is connected to the first inlet a of the economizer 40. The other path is connected with the electromagnetic valve 80, is connected with a second inlet C of the economizer 40 after passing through the air supplementing electronic expansion valve 70, and is connected with an air supplementing port of the compressor 10 after passing through a second outlet D communicated with the second inlet C.

Here, the solenoid valve 80 is set to a closed state of power off, that is, an initial state after power on is an open state. And the initial state of the air-supplementing electronic expansion valve 70 is a closed state. The heat pump air conditioner generally needs to supplement air and increase enthalpy when heating in winter. The solenoid valve 80 and the electronic expansion valve 70 in the air make-up enthalpy circuit are opened. Further, in the air-make-up enthalpy control process, the opening degrees of the air-make-up electronic expansion valve 70 and the main electronic expansion valve 60 are controlled to adjust the amount of refrigerant at the air-make-up port of the compressor 10. It will be appreciated that when the heat pump air conditioner does not require supplemental air to increase enthalpy, the solenoid valve 80 and the supplemental air electronic expansion valve 70 need to be closed.

In addition, when the heat pump air conditioner is in heating operation and performs air-supplementing enthalpy-increasing control, the refrigerant flowing through the first inlet a and the first outlet B of the economizer 40 in the heating cycle is a medium-high temperature liquid refrigerant subjected to heat exchange by the indoor side heat exchanger 30. In the air-supplementing enthalpy-increasing loop, the refrigerant flowing through the second inlet C and the second outlet D of the economizer 40 is low-temperature gas-liquid refrigerant which is cooled and depressurized through the air-supplementing electronic expansion valve 70. The refrigerant in the two circuits exchanges heat in the economizer 40 so that the refrigerant in the vapor-enriched enthalpy circuit absorbs heat to become a gas that is drawn in by the vapor-enriched port of the compressor.

Optionally, the air-supplementing enthalpy-increasing circuit further includes a defrosting pipe 51 disposed on the chassis 52 of the outdoor side heat exchanger 50 of the heating cycle and close to the bottom of the outdoor heat exchanger 50. One end of the defrosting pipe 51 is connected with the air supplementing electronic expansion valve 70, and the other end is connected with the electromagnetic valve 80.

Here, the refrigerant in the air-supplementing enthalpy-increasing circuit is a medium-high temperature refrigerant before flowing through the air-supplementing electronic expansion valve 70. Therefore, the defrosting pipe 51 is added at the time of low-temperature cooling. So that the medium and high temperature refrigerant in the circuit can heat the bottom of the outdoor side heat exchanger 50 and the bottom pan 52. So that the condensed water on the surface of the outdoor side heat exchanger 50 is not frosted and frozen at the bottom of the outdoor side heat exchanger and the chassis due to low temperature. In this way, the chassis 52 of the outdoor heat exchanger 50 is heated without providing an electric heating device, which contributes to an increase in heating power of the air conditioner and energy saving.

Alternatively, the defrosting pipe 51 has a shape corresponding to the cross-sectional shape of the coil of the outdoor side heat exchanger 50. In this way, the heat exchange between the two can be further improved. The shape of the defrosting pipe 51 can be seen in fig. 2.

Optionally, an electric heating belt 11 is provided at the bottom of the compressor 10 to heat the compressor when the temperature of the bottom of the compressor is low. Thereby avoiding the liquid impact of the compressor in the air supplementing and enthalpy increasing process.

Referring to fig. 3, an embodiment of the disclosure provides a control method for air-supplementing and enthalpy-increasing of a heat pump air conditioner, including:

s101, under the condition that the processor determines that the heat pump air conditioner executes the air-supplementing enthalpy-increasing control instruction, controlling the air-supplementing enthalpy-increasing loop to be in a conducting state, and controlling the air-supplementing electronic expansion valve to be opened to a preset opening.

S102, the processor acquires the exhaust temperature change rate of the compressor.

And S103, the processor adjusts the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve according to the exhaust temperature change rate.

Here, when receiving the air-supplementing enthalpy-increasing control instruction, the air-supplementing enthalpy-increasing loop is controlled to be in a conducting state. The electromagnetic valve is in an open state, and the air supplementing electronic expansion valve is opened. And simultaneously, the opening of the air supplementing electronic expansion valve is adjusted to a preset opening. The preset opening is set, and is usually not more than 50% of the maximum opening. For example, the value 100Pluse may be taken. The initial opening of the air supplementing electronic expansion valve is not excessively large, so that excessive air supplementing amount caused by sudden increase of the refrigerant of the compressor is avoided. So that the return air of the compressor is carried with liquid to generate liquid impact, and the reliability of the compressor is affected.

Further, the temperature sensor detects the discharge temperature Td of the compressor, and calculates the discharge temperature change rate μ of the compressor. If the detection period of the exhaust temperature is t _s, the exhaust temperature change rate μ= (Td (n) -Td (n-1))/t _s. Td (n) is the exhaust temperature detected in the nth detection period, td (n-1) is the exhaust temperature detected in the (n-1) th detection period, and t _s can take on a value of 30s. The exhaust temperature change rate can rapidly and accurately reflect the exhaust condition of the compressor. And then according to the exhaust temperature change rate, the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve are adjusted. Specifically, when the exhaust temperature variation rate indicates that the exhaust temperature is rising, the opening degree of the air-supplementing electronic expansion valve may be adjusted while the opening degree of the main electronic expansion valve is adjusted. Thus, the pressure of the front and the back of the air supplementing electronic expansion valve is increased, and the flow of the refrigerant of the air supplementing port of the compressor is increased, so that the exhaust temperature is reduced. Or when the exhaust temperature change rate indicates that the exhaust temperature is decreasing, the opening degree of the air supplementing electronic expansion valve can be adjusted to be small, and the opening degree of the main electronic expansion valve can be adjusted to be large. Thus, the pressure of the front and the rear of the air supplementing electronic expansion valve is reduced, and the flow of the refrigerant of the air supplementing port of the compressor is reduced. Thereby reducing the discharge air quantity of the compressor and improving the discharge air temperature. Therefore, the heating capacity of the heat pump air conditioner is improved, and the steady-state operation of the system is ensured.

By adopting the control method for the air-supplementing and enthalpy-increasing of the heat pump air conditioner, under the condition that the air-supplementing and enthalpy-increasing of the heat pump air conditioner is determined, the conduction of the air-supplementing and enthalpy-increasing loop is controlled, and the opening of the air-supplementing electronic expansion valve to the preset opening is controlled. And then according to the exhaust temperature change rate, the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve are adjusted. The exhaust temperature is adjusted by adjusting the flow of the refrigerant at the air supplementing port of the compressor. Therefore, the system runs towards steady state operation, and the heating capacity of the system in a low-temperature environment is improved.

Optionally, as shown in fig. 4, in step S103, the processor adjusts the opening degrees of the air-supplementing electronic expansion valve and the main electronic expansion valve according to the exhaust temperature change rate, including:

And S131, the processor adjusts the air supplementing electronic expansion valve according to the first amplitude value under the condition that the absolute value of the exhaust temperature change rate is larger than or equal to the first threshold value, and determines a second amplitude value according to the current opening of the main electronic expansion valve, so as to adjust the main electronic expansion valve.

S132, the processor adjusts the air supplementing electronic expansion according to the third amplitude value and adjusts the main electronic expansion valve according to the fourth amplitude value under the condition that the absolute value of the exhaust temperature change rate is smaller than the first threshold value and larger than the second threshold value; wherein the first amplitude is greater than the third amplitude and the second amplitude is greater than the fourth amplitude.

And S133, the processor keeps the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve under the condition that the absolute value of the exhaust temperature change rate is smaller than or equal to a second threshold value and the temperature difference of the refrigerant in the heating circulation loop at the inlet and the outlet of the economizer is larger than the temperature difference threshold value.

Here, a first threshold value and a second threshold value are set for the absolute value of the exhaust gas temperature change rate for characterizing the speed of the exhaust gas temperature change rate. For example, the first threshold takes on 5% and the second threshold takes on 2%. When the absolute value of the exhaust gas temperature change rate is greater than or equal to the first threshold value, it is indicated that the exhaust gas temperature change is rapid. In this case, the opening degree adjustment ranges of the air-supplementing electronic expansion valve and the main electronic expansion valve need to be adjusted to a large extent to improve the exhaust temperature. In the case where the absolute value of the exhaust gas temperature change rate is smaller than the first threshold value and larger than the second threshold value, it is indicated that the exhaust gas temperature change is slow. In this case, the opening adjustment ranges of the air-supplementing electronic expansion valve and the main electronic expansion valve are small. In the case where the absolute value of the exhaust gas temperature change rate is less than or equal to the second threshold value, it is indicated that the exhaust gas temperature tends to be stable. At this time, the temperature Tc ₁、Tc₂ of the heating cycle circuit refrigerant at the inlet and outlet of the economizer is detected to obtain the temperature difference Δtc=tc ₁-Tc₂. If the temperature difference is larger than the preset temperature difference Tc _set, the heating effect is better. And (3) keeping the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve. Wherein, the temperature difference threshold value can take the value of 20 ℃. The first amplitude may take on the value of 50Pluse and the third amplitude may take on the value of 10Pluse. The second amplitude may have a range of 20Pluse-5Pluse and the fourth amplitude may have a value of 2Pluse-3Pluse.

As described above, the exhaust gas temperature change rate has a positive value or a negative value. When the exhaust gas temperature change rate is a positive value, it indicates that the exhaust gas temperature is increasing. The opening of the air supplementing electronic expansion valve is required to be increased according to the corresponding amplitude, and the opening of the main electronic expansion valve is required to be decreased. Similarly, when the exhaust gas temperature change rate is a positive value, it is indicated that the exhaust gas temperature is decreasing. The opening of the air supplementing electronic expansion valve is required to be reduced according to the corresponding amplitude, and the opening of the main electronic expansion valve is also required to be increased.

In addition, when the main electronic expansion valve needs to be adjusted to a large extent, the second amplitude is determined based on the current opening of the main electronic expansion valve. In general, the larger the current opening degree, the larger the second amplitude. After the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve are maintained, if the heating demand load of the heat pump air conditioner is changed (namely, the set target temperature is reduced), or the load factor of the heat pump air conditioner is reduced (namely, the output load capacity of the heat pump air conditioner is larger than the demand of a user), the air supplementing enthalpy increasing loop is closed. Otherwise, the air supplementing and enthalpy increasing loop is kept open, and the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve are kept.

Optionally, in step S131, the processor determines the second amplitude by determining the current opening of the main electronic expansion valve by:

and the processor determines a second amplitude corresponding to the current opening of the main electronic expansion valve according to the corresponding relation between the opening interval and the amplitude.

Here, the opening interval may be set to a plurality of intervals, and each interval corresponds to a different amplitude. And the larger the value of the opening interval is, the larger the amplitude is. As one example, the opening degree of the main electronic expansion valve is set to four sections, [ maximum opening degree, 200 ], [200, 150 ], [150, 100), [100,0]. The corresponding amplitudes are 20Pluse, 15Pluse, 10Pluse, 5Pluse in order. Thus, the opening degree of the main electronic expansion valve can be accurately adjusted.

Optionally, in step S103, the processor adjusts the opening degrees of the air-supplementing electronic expansion valve and the main electronic expansion valve according to the exhaust temperature change rate, and further includes:

S134, the processor acquires the exhaust temperature change rate again under the condition that the absolute value of the exhaust temperature change rate is smaller than or equal to a second threshold value and the temperature difference of a refrigerant in the heating circulation loop at the inlet and the outlet of the economizer is smaller than or equal to a temperature difference threshold value; and according to the latest obtained exhaust temperature change rate, the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve are adjusted.

Here, if the temperature difference of the refrigerant at the inlet and outlet of the economizer in the heating cycle is less than or equal to the temperature difference threshold, it is indicated that the heating effect does not reach the preferable state. Therefore, it is necessary to re-acquire the exhaust gas temperature change rate and adjust the opening of the air-make-up and main electronic expansion valve according to the latest exhaust gas temperature change rate. The specific adjustment strategy may be parameterized by steps S131 to S133 described above.

Referring to fig. 5, an embodiment of the present disclosure provides another control method for air-supplementing and enthalpy-increasing of a heat pump air conditioner, including:

s204, the processor acquires the exhaust temperature of the compressor under the condition that the heat pump air starts to operate in a heating mode and the outdoor environment temperature is less than or equal to the first temperature.

S205, determining that the heat pump air conditioner controls to execute an air supplementing enthalpy increasing control instruction under the condition that the exhaust temperature meets the preset condition; the preset condition is that the exhaust temperature is greater than or equal to a first exhaust threshold value and less than or equal to a second exhaust threshold value.

S101, the processor controls the air supplementing enthalpy increasing loop to be in a conducting state, and controls the air supplementing electronic expansion valve to be opened to a preset opening degree.

Here, it is determined whether the heat pump air conditioner performs the air-supplementing enthalpy-increasing control by detecting the outdoor ambient temperature and the compressor discharge temperature. Specifically, when the outdoor ambient temperature is less than the first temperature, it indicates that the outdoor ambient temperature is low. In order to avoid the attenuation of the heating capacity of the air conditioning system, the air supplementing and enthalpy increasing functions of the compressor are required to be started. Further, the exhaust temperature of the compressor is obtained, and whether the exhaust temperature of the compressor meets a preset condition is judged. If the compressor discharge temperature does not meet the preset condition, it is indicated that the compressor discharge temperature is too low or too high. When the exhaust temperature is too high, the system is unstable to operate, and if the air supplementing and enthalpy increasing are carried out, the exhaust of the compressor is changed, so that the air conditioning system is in fault. When the exhaust temperature is too low, the air supplementing enthalpy increasing effect is that the exhaust temperature of the compressor is lower, and the compressor is easy to fail. Therefore, when the exhaust temperature and the outdoor temperature meet the conditions, the compressor is controlled to carry out air supplementing and enthalpy increasing. In addition, the first temperature may take on a value of-3 ℃, the first exhaust threshold Td ₁ may take on a value of 55 ℃, and the second exhaust threshold Td ₂ may take on a value of 110 ℃.

Referring to fig. 6, an embodiment of the present disclosure provides another control method for air-supplementing and enthalpy-increasing of a heat pump air conditioner, including:

S206, controlling the conduction of the air supplementing enthalpy increasing pipeline by the processor under the condition that the exhaust temperature does not meet the preset condition and is larger than a second exhaust threshold value; and adjusting the opening of the air supplementing electronic expansion valve so that the exhaust temperature meets the preset condition.

S207, the processor controls the closing of the air supplementing and enthalpy increasing pipeline under the condition that the exhaust temperature does not meet the preset condition and the exhaust temperature is smaller than the first exhaust threshold.

And S101, after the processor executes S205, controlling the air supplementing and enthalpy increasing loop to be in a conducting state, and controlling the air supplementing electronic expansion valve to be opened to a preset opening degree.

Here, when the discharge temperature is greater than the second discharge threshold, it is indicated that the current discharge temperature of the compressor is too high. At this time, the air-supplementing enthalpy-increasing pipeline is controlled to be opened. The opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve are regulated so as to enable the exhaust temperature to be quickly reduced to be within a section of a preset condition. Specifically, the opening degree of the air supplementing electronic expansion valve is adjusted to be large, and the opening degree of the main electronic expansion valve is adjusted to be small at the same time. The opening of the air supplementing electronic expansion valve is increased by a fifth amplitude value which is larger than the first amplitude value. If the fifth amplitude can take the value of 100Pluse, the adjusting amplitude of the main electronic expansion valve can be 5Pluse.

Meanwhile, when the discharge temperature is less than the first discharge threshold value, the current discharge temperature of the compressor is indicated to be too low. Therefore, the closing of the air supplementing and enthalpy increasing pipeline, namely the closing of the electromagnetic valve, is controlled so as to avoid the fault of the compressor. And after the exhaust temperature rises and meets the preset condition, controlling the compressor to execute air supplementing and enthalpy increasing.

Referring to fig. 7, another method for controlling air supply and enthalpy increase of a heat pump air conditioner according to an embodiment of the present disclosure includes:

S306, the processor acquires the operation frequency of the compressor under the condition that the heat pump air starts the operation heating mode and the outdoor environment temperature is less than or equal to the first temperature.

S307, the processor judges whether the bottom temperature of the compressor is higher than the preset bottom pressing temperature under the condition that the operation frequency of the compressor is higher than or equal to the preset frequency; if yes, then S204 is performed; if not, S308 is performed.

S308, the processor controls the electric heating belt of the compressor to be started so as to increase the bottom temperature of the compressor to a preset bottom pressing temperature, and then S204 is executed.

S204, the processor acquires the exhaust temperature of the compressor.

Here, when the outdoor environment indicates that the air-supplementing enthalpy-increasing function is required to be started, the operation frequency of the compressor is further judged. If the compressor frequency is low, no make-up gas enthalpy increase is required. In this case, the heating requirement of the user may be low, and on the other hand, the air supply may cause the air suction of the compressor to carry liquid at a low frequency. Therefore, when the compressor frequency is low, the air-supplementing enthalpy-increasing is not performed. When the compressor frequency is greater than or equal to the preset frequency, the compressor is susceptible to excessive discharge temperature. Therefore, it is determined that the compressor needs to start the air-supplementing enthalpy-increasing function. However, when the bottom temperature of the compressor is low, the liquid impact hidden trouble exists in the air supplementing and enthalpy increasing process of the compressor. And therefore, when the bottom temperature of the compressor is less than or equal to the preset bottom pressing temperature, the compressor is heated so as to increase the bottom temperature of the compressor. So as to avoid the occurrence of liquid impact. After the temperature of the bottom of the compressor is raised, the electric heating belt is turned off. And then, further judging whether the exhaust temperature of the compressor meets the condition of opening the air supplementing and enthalpy increasing.

In practical use, as shown in figure 8,

S401, starting up a heat pump air conditioner to operate a heating mode;

S402, judging whether the outdoor environment temperature Tao is smaller than or equal to the first temperature Tao ₁, if so, executing S403; if not, then S402 is performed;

S403, judging whether the frequency f of the compressor is larger than or equal to a preset frequency f _set, if so, executing; if not, then S403 is performed;

S404, judging whether the bottom temperature Tb of the compressor is greater than a preset bottom pressing temperature Tb _set; if yes, then execute S407; if not, then S405 is performed;

s405, controlling the electric heating belt of the compressor to start and run;

S406, when Tb is larger than Tb _set, controlling the electric heating belt to be closed;

S407, judging whether the exhaust temperature Td of the compressor satisfies a preset condition (Td ₁≤Td≤Td₂), if yes, executing S410; if not and Td > Td ₂, then S408 is performed; if not and Td < Td ₁, then S409 is performed;

S408, controlling the electromagnetic valve to be opened, opening the air supplementing electronic expansion valve to 200Pluse, and reducing the main electronic expansion valve by 5Pluse; then S407 is performed;

s409, controlling the electromagnetic valve to be closed, and then executing S407;

s410, controlling the electromagnetic valve to be opened, and opening the air supplementing electronic expansion valve to a preset opening degree of 100Pluse;

S411, adjusting the opening of the air supplementing electronic expansion valve and the main electronic expansion valve according to the exhaust temperature change rate mu; (specifically, when mu is more than or equal to 5%, the first amplitude of the air-supplementing electronic expansion valve is regulated and the second amplitude of the main electronic expansion valve is regulated, when mu is more than or equal to 2% < 5%, the third amplitude of the air-supplementing electronic expansion valve is regulated and the fourth amplitude of the main electronic expansion valve is regulated, when mu is more than or equal to-5%, the first amplitude of the air-supplementing electronic expansion valve is regulated and the second amplitude of the main electronic expansion valve is regulated, and when mu is more than or equal to-5%, the third amplitude of the air-supplementing electronic expansion valve is regulated and the fourth amplitude of the main electronic expansion valve is regulated;

s412, judging whether mu satisfies-2% or more and mu is less than or equal to 2%; if yes, then S413 is performed; if not, then S411 is performed;

S413, judging whether DeltaTc is more than Tc _set; if yes, then S414 is performed; if not, then S411 is performed;

and S414, maintaining the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve.

The embodiment of the disclosure provides a control device for supplementing air and increasing enthalpy of a heat pump air conditioner, which comprises a control module, an acquisition module and an adjustment module. The control module is configured to control the air supplementing enthalpy increasing loop to be in a conducting state and control the air supplementing electronic expansion valve to be opened to a preset opening degree under the condition that the heat pump air conditioner executes the air supplementing enthalpy increasing control instruction; the acquisition module is configured to acquire a discharge temperature change rate of the compressor; the adjusting module is configured to adjust the opening degrees of the air-supplementing electronic expansion valve and the main electronic expansion valve according to the exhaust temperature change rate.

By adopting the control device for air supplementing and enthalpy increasing of the heat pump air conditioner, under the condition that the air supplementing and enthalpy increasing of the heat pump air conditioner is determined, the air supplementing and enthalpy increasing loop is controlled to be conducted, and the air supplementing electronic expansion valve is controlled to be opened to a preset opening. And then according to the exhaust temperature change rate, the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve are adjusted. The exhaust temperature is adjusted by adjusting the flow of the refrigerant at the air supplementing port of the compressor. Therefore, the system runs towards steady state operation, and the heating capacity of the system in a low-temperature environment is improved.

As shown in fig. 9, an embodiment of the present disclosure provides a control device for air-supplementing and enthalpy-increasing of a heat pump air conditioner, including a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may invoke logic instructions in the memory 101 to execute the control method for air make-up and enthalpy increase of the heat pump air conditioner of the above embodiment.

Further, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.

The memory 101 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes the program instructions/modules stored in the memory 101 to perform the functional application and data processing, i.e., to implement the control method for air-conditioning and enthalpy-increasing of the heat pump air conditioner in the above embodiment.

The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.

The embodiment of the disclosure provides a heat pump air conditioner, which comprises the control device for air supplementing and enthalpy increasing of the heat pump air conditioner.

The embodiment of the disclosure provides a storage medium storing computer executable instructions configured to execute the control method for supplementing air and increasing enthalpy of a heat pump air conditioner.

The storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

Embodiments of the present disclosure may be embodied in a software product stored on a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of a method according to embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium including: a plurality of media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or a transitory storage medium.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this disclosure is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in the present disclosure, the terms "comprises," "comprising," and/or variations thereof, mean that the recited features, integers, steps, operations, elements, and/or components are present, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus that includes the element. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.

Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. The control method for the air supplementing and enthalpy increasing of the heat pump air conditioner is characterized in that the heat pump air conditioner comprises a heating circulation loop and an air supplementing and enthalpy increasing loop, and a main electronic expansion valve is arranged on the heating circulation loop; the air supplementing enthalpy increasing loop is connected in parallel between the indoor side heat exchanger of the heating circulation loop and the compressor and is used for supplementing air for the compressor; the air supplementing and enthalpy increasing loop is provided with an air supplementing electronic expansion valve; the control method comprises the following steps:

Under the condition that the heat pump air conditioner executes the air-supplementing enthalpy-increasing control instruction, controlling the air-supplementing enthalpy-increasing loop to be in a conducting state, and controlling the air-supplementing electronic expansion valve to be opened to a preset opening degree;

Obtaining the exhaust temperature change rate of the compressor;

According to the exhaust temperature change rate, opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve are adjusted;

Under the condition that the change rate of the exhaust temperature is a positive value, the regulating trend of the air supplementing electronic expansion valve is regulated to be larger, and the regulating trend of the main electronic expansion valve is regulated to be smaller; under the condition that the exhaust temperature change rate is a negative value, the regulating trend of the air supplementing electronic expansion valve is regulated down, and the regulating trend of the main electronic expansion valve is regulated up; in addition, the regulating amplitude of the air supplementing electronic expansion valve is larger than that of the main electronic expansion valve.

2. The method according to claim 1, wherein adjusting the opening degrees of the air-supplementing electronic expansion valve and the main electronic expansion valve according to the exhaust gas temperature change rate includes:

When the absolute value of the exhaust temperature change rate is greater than or equal to a first threshold value, adjusting the air supplementing electronic expansion valve according to the first amplitude value, determining a second amplitude value according to the current opening of the main electronic expansion valve, and adjusting the main electronic expansion valve according to the second amplitude value;

Under the condition that the absolute value of the exhaust temperature change rate is smaller than the first threshold value and larger than the second threshold value, the air supplementing electronic expansion is regulated according to the third amplitude value, and the main electronic expansion valve is regulated according to the fourth amplitude value;

maintaining the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve under the condition that the absolute value of the exhaust temperature change rate is smaller than or equal to a second threshold value and the temperature difference of the refrigerant in the heating circulation loop at the inlet and the outlet of the economizer is larger than the temperature difference threshold value;

Wherein the first amplitude is greater than the third amplitude and the second amplitude is greater than the fourth amplitude.

3. The method of claim 2, wherein the second magnitude is determined by determining a current opening of the main electronic expansion valve by:

determining a second amplitude corresponding to the current opening of the main electronic expansion valve according to the corresponding relation between the opening interval and the amplitude;

wherein, the larger the value of the opening interval is, the larger the amplitude is.

4. The method of claim 1, wherein the heat pump air conditioner is determined to execute the make-up enthalpy control command by:

Under the condition that the heat pump air conditioner starts to operate a heating mode and the outdoor environment temperature is smaller than or equal to the first temperature, the exhaust temperature of the compressor is obtained;

under the condition that the exhaust temperature meets the preset condition, determining that the heat pump air conditioner control executes an air supplementing enthalpy increasing control instruction;

the preset condition is that the exhaust temperature is greater than or equal to a first exhaust temperature threshold and less than or equal to a second exhaust temperature threshold.

5. The method of claim 4, wherein the bottom of the compressor is provided with an electric heating belt; before the obtaining the discharge temperature of the compressor, the method further comprises:

Acquiring the operating frequency of a compressor;

Judging whether the bottom temperature of the compressor is higher than the preset bottom temperature or not under the condition that the running frequency of the compressor is higher than or equal to the preset frequency; if yes, obtaining the exhaust temperature of the compressor; if not, controlling the electric heating belt of the compressor to be started so as to increase the bottom temperature of the compressor to the preset bottom temperature.

6. The method according to claim 4, wherein the method further comprises:

Controlling the conduction of the air supplementing and enthalpy increasing pipeline under the condition that the exhaust temperature does not meet the preset condition and is higher than a second exhaust threshold value;

and adjusting the opening degrees of the air supplementing electronic expansion valve and the main electronic expansion valve so that the exhaust temperature meets the preset condition.

7. The method according to claim 4, wherein the method further comprises:

and controlling the closing of the air supplementing and enthalpy increasing pipeline under the condition that the exhaust temperature does not meet the preset condition and is smaller than the first exhaust threshold value.

8. A control device for air-supplementing and enthalpy-increasing of a heat pump air conditioner, comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method for air-supplementing and enthalpy-increasing of a heat pump air conditioner according to any one of claims 1 to 7 when running the program instructions.

9. A heat pump air conditioner, comprising:

The heating circulation loop comprises a main electronic expansion valve; is used for heating;

The air supplementing and enthalpy increasing loop comprises an air supplementing electronic expansion valve; the air supplementing and enthalpy increasing loop is connected in parallel between the indoor side heat exchanger and the compressor; the device is used for supplementing air and increasing enthalpy for the compressor; and, a step of, in the first embodiment,

The control device for air-supplementing and enthalpy-increasing of a heat pump air conditioner according to claim 8.

10. The heat pump air conditioner according to claim 9, wherein the air-make-up enthalpy-increasing circuit further includes:

the defrosting pipe is arranged on the chassis of the outdoor side heat exchanger of the heating circulation loop and is close to the bottom of the outdoor side heat exchanger; one end of the defrosting pipe is connected with the electromagnetic valve, and the other end of the defrosting pipe is connected with the air supplementing electronic expansion valve.