CN218154581U - Heat pump air conditioning system - Google Patents
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- CN218154581U CN218154581U CN202221744875.9U CN202221744875U CN218154581U CN 218154581 U CN218154581 U CN 218154581U CN 202221744875 U CN202221744875 U CN 202221744875U CN 218154581 U CN218154581 U CN 218154581U
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Abstract
The application relates to the technical field of intelligent household appliances and discloses a heat pump air conditioning system, which comprises: the refrigerant circulating flow path comprises a compressor, a four-way valve, a water side heat exchanger, a first throttling device and an air side heat exchanger; the refrigerant flow regulating device comprises a liquid storage device and a second throttling device; the liquid storage device is arranged on a refrigerant circulating pipeline between the first throttling device and the water side heat exchanger; the second throttling device is arranged on a refrigerant circulating pipeline between the liquid storage device and the water side heat exchanger. When the heat pump air conditioning system is in a heating mode, the system can adjust the opening degree of the second throttling device in real time according to relevant parameters of actual working conditions. And the pressure of a pipeline where the liquid storage device is positioned is adjusted by adjusting the opening. And further the refrigerant quantity in the liquid storage device is changed to adapt to the working condition. Therefore, the control precision of the refrigerant quantity is improved, and the heat pump air conditioning unit is facilitated to exert the maximum performance.
Description
Technical Field
The application relates to the technical field of intelligent household appliances, for example to a heat pump air conditioning system.
Background
At present, the quantity of refrigerant is fixed when a heat pump air conditioning system heats. If the refrigerant quantity is adjusted according to the fixed-point working condition, the unit is caused to have the condition of refrigerant shortage or excessive refrigerant under the extreme working condition of the other side. And thus the heat pump air conditioner cannot fully exert the optimal performance.
In the related art, a heat pump system is disclosed, which includes: the refrigerant circulating flow path comprises a compressor, a four-way valve, an air side heat exchanger, a water side heat exchanger and a gas-liquid separator; and the liquid storage pipeline comprises a liquid storage device, a first pipeline and a second pipeline, and one ends of the first pipeline and the second pipeline are communicated with a liquid inlet of the liquid storage device. The other end of the first pipeline is communicated with a first refrigerant pipeline between the air side heat exchanger and the water side heat exchanger, and a first valve element is arranged on the first pipeline; the other end of the second pipeline is communicated with a second refrigerant pipeline between the four-way valve and the gas-liquid separator, and a second valve element is arranged on the second pipeline.
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 adjustment of the refrigerant quantity is realized through the switching action of the electromagnetic valve, and the refrigerant quantity control precision is low.
SUMMERY OF THE UTILITY MODEL
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 nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a heat pump air conditioning system to improve the control precision of refrigerant quantity adjustment.
In some embodiments, the heat pump air conditioning system comprises: the refrigerant circulating flow path comprises a compressor, a four-way valve, a water side heat exchanger, a first throttling device and an air side heat exchanger;
the refrigerant flow regulating device comprises a liquid storage device and a second throttling device; the liquid storage device is arranged on a refrigerant circulating pipeline between the first throttling device and the water side heat exchanger; the second throttling device is arranged on a refrigerant circulating pipeline between the liquid storage device and the water side heat exchanger.
Optionally, the first throttling means comprises a first electronic expansion valve; the second throttling means comprises a second electronic expansion valve.
Optionally, the refrigerant flow rate adjusting device further includes:
the first pressure sensor is arranged between the liquid storage device and the first throttling device;
the opening degree of the second throttling device is adjusted, the detection value of the first pressure sensor is changed, and therefore the amount of the refrigerant in the liquid storage device is adjusted.
Optionally, the refrigerant circulation flow path further includes:
the second pressure sensor is arranged at an air return port of the compressor; and when the refrigerant quantity in the liquid storage device is adjusted, the opening degree of the first throttling device is synchronously adjusted, so that the evaporation pressure of the compressor detected by the second pressure sensor is unchanged.
Optionally, the refrigerant circulation flow path further includes:
and the air outlet of the gas-liquid separator is connected with the air return port of the compressor, and the liquid inlet of the gas-liquid separator is connected with one end of the four-way valve.
Optionally, the air-side heat exchanger comprises: two heat exchangers in parallel.
Optionally, the heat pump air conditioning system further comprises:
the first temperature sensor is arranged at a water outlet of the water side heat exchanger and used for detecting the temperature of water;
the second temperature sensor is arranged at the air outlet of the compressor and used for detecting the air outlet temperature;
and the third pressure sensor is arranged on a refrigerant circulating path connected with the exhaust port of the compressor and the four-way valve and used for detecting the condensing pressure of the compressor.
Optionally, the heat pump air conditioning system further comprises:
the first controller is electrically connected with the first throttling device and the second throttling device; configured to, in the heating mode, if the outlet water temperature detected by the first temperature sensor increases, decrease the opening degree of the second throttling device and increase the opening degree of the first throttling device when the detection values of the second temperature sensor and the third pressure sensor are both greater than or equal to the corresponding first temperature threshold value and first pressure threshold value; or the like, or, alternatively,
and if the outlet water temperature detected by the first temperature sensor is reduced, under the condition that the detection values of the second temperature sensor and the third pressure sensor are both smaller than the corresponding second temperature threshold and the second pressure threshold, the opening degree of the second throttling device is increased, and the opening degree of the first throttling device is decreased.
Optionally, the heat pump air conditioning system further comprises:
the second temperature sensor is arranged at the air outlet of the compressor and used for detecting the air exhaust temperature;
and the third temperature sensor is arranged at the coil pipe of the air side heat exchanger and used for detecting the ambient temperature.
Optionally, the heat pump air conditioning system further comprises:
the second controller is electrically connected with the first throttling device and the second throttling device; configured to, in the heating mode, if the ambient temperature detected by the third temperature sensor increases, decrease the opening degree of the second throttle device and increase the opening degree of the first throttle device in a case where the detection value of the second temperature sensor is greater than or equal to a third temperature threshold value and the detection value of the third pressure sensor is less than or equal to a third pressure threshold value; or the like, or a combination thereof,
and if the ambient temperature detected by the third temperature sensor is reduced, the opening degree of the second throttling device is increased and the opening degree of the first throttling device is decreased under the condition that the second temperature sensor is smaller than the corresponding fourth temperature threshold value and the detection value of the third pressure sensor is larger than or equal to the fourth pressure threshold value.
The heat pump air conditioning system provided by the embodiment of the disclosure can realize the following technical effects:
according to the embodiment of the disclosure, the liquid storage device is arranged between the two throttling devices, namely, the liquid storage device is arranged on a medium-pressure section pipeline. When the heat pump air-conditioning system is in a heating mode, the opening degree of the second throttling device can be adjusted in real time according to relevant parameters of actual working conditions. And the pressure of a pipeline where the liquid storage device is positioned is adjusted by adjusting the opening. And further the refrigerant quantity in the liquid storage device is changed to adapt to the working condition. Therefore, the control precision of the refrigerant quantity is improved, and the heat pump air conditioning unit is facilitated to exert the maximum performance.
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 in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is an overall schematic view of a heat pump air conditioning system provided by an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of another heat pump air conditioning system provided by the embodiment of the disclosure;
fig. 3 is a schematic diagram illustrating a first flow direction of a refrigerant of a heat pump air conditioning system according to an embodiment of the disclosure;
fig. 4 is a schematic diagram illustrating a second flow direction of a refrigerant of the heat pump air conditioning system according to the embodiment of the disclosure;
fig. 5 is a schematic diagram of a controller of a heat pump air conditioning system according to an embodiment of the disclosure.
Reference numerals:
10: a compressor; 20: a four-way valve; 30: a water side heat exchanger; 40: an air-side heat exchanger; 50: a gas-liquid separator; 60: a first throttling device; 70: a liquid storage device; 80: a second throttling device; 91: a first pressure sensor; 92: a second pressure sensor; 93: a third pressure sensor; 94: a first temperature sensor; 95: a second temperature sensor; 96: a third temperature sensor; 41: a first air side heat exchanger; 42: a second air-side heat exchanger; 110: a first controller; 120: and a second controller.
Detailed Description
So that the manner in which the features and advantages of the embodiments of the present disclosure can be understood in detail, a more particular description of the embodiments of the disclosure, briefly summarized above, may be had by reference to the appended drawings, which are included to illustrate, but are not intended to limit 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 be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and claims of the embodiments of the disclosure and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used in other meanings besides orientation or positional relationship, for example, the term "upper" may also be used in some cases to indicate a certain attaching or connecting relationship. The specific meanings of these terms in the embodiments of the present disclosure may be understood as specific cases by those of ordinary skill in the art.
In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the disclosed embodiments can be understood by those of ordinary skill in the art according to specific situations.
The term "plurality" means two or more, unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. E.g., a and/or B, represents: a or B, or A and B.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.
As shown in fig. 1, an embodiment of the present disclosure provides a heat pump air conditioning system, which includes a refrigerant circulation flow path and a refrigerant flow rate adjusting device. The refrigerant circulation path includes a compressor 10, a four-way valve 20, a water-side heat exchanger 30, a first throttle device 60, and an air-side heat exchanger 40, which are connected in this order. The refrigerant flow regulating device comprises a liquid storage device 70 and a second throttling device 80; the liquid storage device 70 is arranged on a refrigerant circulating path between the first throttling device 60 and the water side heat exchanger 30; the second throttling means 80 is disposed on the refrigerant circulation path between the liquid storage means 70 and the water side heat exchanger 30.
Here, the liquid storage device 70 of the refrigerant flow rate adjusting device and the second throttle device 80 may be disposed at positions where the liquid storage device 70 is disposed on the refrigerant circulation path between the first throttle device 60 and the air-side heat exchanger 40. The second throttle device 80 is disposed on the refrigerant circulation path between the liquid storage device 70 and the air-side heat exchanger 40.
In the related art, when the heat pump air conditioning system operates in the heating mode, the air-side heat exchanger 40 is an evaporator, and the water-side heat exchanger 30 is a condenser. When the air side ambient temperature (i.e., the outside ambient temperature) decreases, the refrigerant density varies due to a change in the evaporation pressure in the evaporator. Therefore, the amount of refrigerant required for the heat pump air conditioning system differs depending on the ambient temperature (the lower the ambient temperature, the more the amount of refrigerant required). In this case, the refrigerant has a characteristic that the density is increased as the temperature is lower. Based on this feature, the amount of refrigerant stored in the liquid storage device 70 is large, and the amount of refrigerant running in the system decreases. The discharge temperature of the compressor 10 is too high, and in order to avoid the discharge too high to trigger system protection, the opening degree of the throttle device of the heat pump air conditioning system is increased and the compressor is decreased in frequency. This deteriorates the system heating performance.
Similarly, when the temperature of the outlet water of the water-side heat exchanger increases, the condensing pressure of the condenser changes, resulting in a difference in refrigerant density. The higher the outlet water temperature is, the more refrigerant quantity is needed by the system. In this case, the refrigerant has a characteristic that the higher the condenser pressure is, the higher the refrigerant density is. Based on this feature, the amount of refrigerant stored in the liquid storage device is large, and the amount of refrigerant running in the system is reduced. The exhaust temperature of the compressor is too high, and in order to avoid the excessive exhaust triggering system protection, the opening degree of a throttling device of the heat pump air conditioning system is increased, and the compressor is subjected to frequency reduction. This also deteriorates the system heating performance.
In the embodiment of the disclosure, when the heat pump air conditioning system operates in the heating mode, the second throttling device is used for throttling once to throttle the high-pressure liquid refrigerant in the water side heat exchanger into the medium-pressure liquid refrigerant. The first throttling device is used for secondary throttling and is used for throttling the medium-pressure liquid refrigerant into a low-pressure liquid refrigerant. The refrigerant flow adjusting device is arranged between the two throttling devices. As described above, the amount of refrigerant required for the system increases as the condenser pressure increases (the water-side condenser outlet water temperature increases) or as the compressor evaporation pressure decreases (the air-side ambient temperature decreases). In this case, the opening degree of the second throttle device is reduced, so that the pressure of the pipe section where the liquid storage device is located is reduced. Therefore, the amount of liquid refrigerant entering the liquid storage device is reduced, and the amount of refrigerant of a system heating cycle is increased. The exhaust temperature of the compressor is reduced, and the heating performance is improved.
Similarly, the lower the condenser pressure (lower the water side condenser leaving water temperature), or the higher the compressor evaporating pressure (higher the air side ambient temperature), the smaller the amount of refrigerant required by the system. In this case, the opening degree of the second throttling device is increased, so that the pressure of the pipeline section where the liquid storage device is located is increased. Thus, the amount of liquid refrigerant entering the liquid storage device is increased, and the amount of refrigerant of a system heating cycle is reduced. The exhaust temperature of the compressor is improved, and the heating performance is improved.
In this manner, the reservoir 70 is disposed between the two restrictions, i.e., on the medium pressure section line. When the heat pump air conditioning system is in the heating mode, the opening degree of the second throttling device 80 can be adjusted in real time according to relevant parameters of actual working conditions. And the pressure of a pipeline where the liquid storage device is positioned is adjusted by adjusting the opening. And further the refrigerant quantity in the liquid storage device is changed to adapt to the working condition. Therefore, the control precision of the refrigerant quantity is improved, and the heat pump air-conditioning system can exert the optimal energy efficiency under different working conditions.
Alternatively, the first throttle device 60 comprises a first electronic expansion valve and the second throttle device 80 comprises a second electronic expansion valve. Here, in order to achieve the regulation of the line pressure at which the liquid storage means is located, an electronic expansion valve is selected as the second throttle means 80. In order to adjust the evaporation pressure of the compressor, an electronic expansion valve is also selected as the first throttle device 60.
Optionally, the refrigerant flow adjusting device further includes:
a first pressure sensor 91 provided between the liquid storage device 70 and the first throttle device 60; the opening degree of the second throttling device 80 is adjusted to change the detection value of the first pressure sensor 91 so as to adjust the refrigerant quantity in the liquid storage device.
Here, a first pressure sensor 91 is provided between the reservoir device 70 and the first restriction device 60. The detection value of the first pressure sensor 91 can determine whether the second throttle device 80 whose opening degree has been adjusted is effective in adjusting the amount of refrigerant in the liquid storage device 70. Specifically, an increase in the detection value of the first pressure sensor 91 indicates an increase in the amount of liquid refrigerant entering the liquid storage device 70. Accordingly, the amount of refrigerant in the heating cycle is reduced. Similarly, an increase in the value detected by the first pressure sensor 91 indicates an increase in the amount of liquid refrigerant entering the liquid storage device 70. The amount of refrigerant in the heating cycle increases.
Optionally, the refrigerant circulation flow path further includes:
and a second pressure sensor 92 disposed at an air return port of the compressor 10. When the amount of refrigerant in the liquid storage device 70 is adjusted, the opening degree of the first throttle device 60 is synchronously adjusted so that the evaporation pressure of the compressor 10 detected by the second pressure sensor 92 is not changed.
Here, when the amount of the liquid refrigerant in the liquid storage device 70 increases, the opening degree of the first throttle device 60 is decreased. When the amount of the refrigerant for the heating cycle in the system is decreased, if the opening degree of the first throttle device 60 is maintained, the refrigerant pressure in the evaporator is decreased. Resulting in excessively low exhaust temperature and reduced heating performance. Therefore, the opening degree of the first throttle device 60 is synchronously adjusted to be small, and the evaporation pressure of the compressor can be kept constant. In this way, the discharge temperature of the compressor is facilitated to be increased. Similarly, when the amount of liquid refrigerant in the liquid reservoir 70 decreases, the opening degree of the first throttle device 60 is increased. When the heating cycle refrigerant amount increases, if the opening degree of the first throttle device 60 is maintained, the refrigerant pressure in the evaporator increases. Further, the evaporation pressure increases, resulting in an excessively high exhaust temperature, and a decrease in heating performance. Therefore, the opening degree of the first throttling device is synchronously increased, the evaporation pressure of the compressor is kept unchanged, and the exhaust temperature of the compressor is improved.
Optionally, the refrigerant circulation flow path further includes:
and the gas-liquid separator 50 has an air outlet connected to the return air port of the compressor 10 and a liquid inlet connected to one end of the four-way valve 20.
Here, the gas-liquid separator 50 is used to separate the gas and liquid of the refrigerant flowing out of the condenser, and prevent the gaseous refrigerant from entering the compressor 10.
Alternatively, as shown in fig. 2, the air-side heat exchanger 40 includes: two air side heat exchangers in parallel, i.e. comprising a first air side heat exchanger 41 and a second air side heat exchanger 42.
Here, two air-side heat exchangers are provided in parallel in order to increase the heat exchange area, contributing to the improvement of the heating performance of the unit.
Optionally, as shown in fig. 2 and 5, the heat pump air conditioning system further comprises:
the first temperature sensor 94 is disposed at the water outlet of the water-side heat exchanger 30 and detects the temperature of water. And a second temperature sensor 95 disposed at an exhaust port of the compressor 10, for detecting an exhaust temperature. And a third pressure sensor 93 disposed on a refrigerant circulation path connecting an exhaust port of the compressor 10 and the four-way valve 20, for detecting a condensing pressure of the compressor.
A first controller 110 electrically connected to the first and second throttle devices 60 and 80; is configured to, in the heating mode, if the outlet water temperature detected by the first temperature sensor 94 increases, decrease the opening degree of the second throttle device 80 and increase the opening degree of the first throttle device 60 in a case where the detection values of the second temperature sensor 95 and the third pressure sensor 93 are both greater than or equal to the corresponding first temperature threshold value and first pressure threshold value. Alternatively, if the leaving water temperature detected by the first temperature sensor 94 decreases, the opening degree of the second throttle device 80 is increased and the opening degree of the first throttle device 60 is decreased when the detected values of the second temperature sensor 95 and the third pressure sensor 93 are both smaller than the corresponding second temperature threshold value and second pressure threshold value.
Here, the outlet water temperature of the water-side heat exchanger 30 may be periodically detected, and the difference between the outlet water temperatures in adjacent periods is calculated, so as to obtain the outlet water temperature variation trend. Wherein, the change trend of the outlet water temperature comprises the gradual reduction of the outlet water temperature or the gradual increase of the outlet water temperature. As shown above, the refrigerant demand of the heat pump air conditioning system varies with the outlet water temperature. Therefore, when the water temperature changes, whether the condensing pressure and the exhaust temperature of the compressor meet corresponding conditions can be further judged. If the difference is satisfied, the refrigerant quantity is required to be adjusted, and then the opening degrees of the first throttling device 60 and the second throttling device 80 are adjusted. If the current opening degree of the first adjusting device 60 and the second throttling device 80 is not satisfied, the refrigerant quantity does not need to be adjusted, and the current opening degree of the first adjusting device 60 and the second throttling device 80 is maintained. Here, the condensing pressure of the compressor is detected by a third pressure sensor 93, and the discharge temperature is detected by a first temperature sensor 94.
When the water temperature change condition of the water-side heat exchanger 30 indicates that the water temperature is increased, if the condensing pressure of the compressor 10 is greater than or equal to the first pressure threshold value and the exhaust temperature is greater than or equal to the first temperature threshold value, the opening degree of the second throttling device 80 is decreased, and the opening degree of the first throttling device 60 is increased; so as to reduce the amount of refrigerant entering the liquid storage device and maintain the evaporation pressure of the compressor unchanged.
When the water temperature change condition of the water-side heat exchanger 30 indicates that the water temperature is reduced, if the condensing pressure of the compressor 10 is less than or equal to a second pressure threshold value and the exhaust temperature is less than or equal to a second temperature threshold value, the opening degree of the second throttling device 80 is increased, and the opening degree of the first throttling device 60 is decreased; so as to increase the quantity of the refrigerant entering the liquid storage device and maintain the evaporation pressure of the compressor unchanged.
In the embodiment of the present disclosure, the outlet water temperature T of the water-side heat exchanger 30 is obtained w According to the temperature T of the outlet water w Further determining the condensing pressure P d And exhaust temperature T d Whether a preset condition is satisfied. If the temperature T of the outlet water w Rate of change of (2)If the temperature is a positive value and is greater than the first preset change rate, the temperature of the outlet water is increased and changes faster. At this time, the system may be in a refrigerant-starved state. Thereby obtaining the condensing pressure P d And exhaust temperature T d (ii) a If the condensing pressure P d Greater than or equal to a first pressure threshold value P 1 ', and exhaust temperature T d Greater than or equal to a first temperature threshold T d1 ', it is determined that the system is in a refrigerant-lack state. At this time, the opening degree of the second throttle device 80 is adjusted to be small so that the detection value of the first pressure sensor 91 is reduced. Thereby reducing the amount of liquid refrigerant entering the liquid storage device 70 and correspondingly increasing the amount of heating cycle refrigerant. At the same time, the opening degree of the first throttle device 60 is increased. So that the evaporation pressure of the evaporator is kept constant; further, the discharge temperature of the compressor is lowered while the amount of the refrigerant of the refrigeration cycle is increased (the refrigerant flow direction is shown in fig. 3). Therefore, the adjustment of the refrigerant quantity is adaptive to the change of the outlet water temperature, and the control precision is improved. The performance of the system is also optimized.
Likewise, if the water outlet temperature T is lower than the water outlet temperature T w When the change rate of (2) is a negative value and is less than a second preset change rate, the temperature of the outlet water is reduced and the change is quicker. At this time, the system may be in a refrigerant rich state. Thereby obtaining the condensing pressure P d And exhaust temperature T d (ii) a If the condensing pressure P d Less than or equal to a second pressure threshold value P 2 ', and exhaust temperature T d Less than or equal to the second temperature threshold T d2 ' determining that the system is in a state of excessive refrigerants. At this time, the opening degree of the second throttle device 80 is increased so that the detection value of the first pressure sensor 91 is increased. Therefore, the amount of liquid refrigerant entering the liquid storage device is increased, and the amount of heating circulating refrigerant is correspondingly reduced. At the same time, the opening degree of the first throttle device 60 is adjusted small. So that the evaporation pressure of the evaporator is kept constant; further, the discharge temperature of the compressor 10 is increased while the amount of the refrigerant in the refrigeration cycle is decreased (the refrigerant flow direction is shown in fig. 4). Therefore, the adjustment of the refrigerant quantity is adaptive to the change of the outlet water temperature, and the control precision is improved. The performance of the system is also optimized.
Optionally, the heat pump air conditioning system further comprises: and a second temperature sensor 95 disposed at an exhaust port of the compressor 10 for detecting an exhaust temperature. And a third temperature sensor 96 provided at the coil of the air-side heat exchanger 40 for detecting the ambient temperature. A second controller 120 electrically connected to the first throttling device 60 and the second throttling device 80; configured to, in the heating mode, if the ambient temperature detected by the third temperature sensor 96 increases, in a case where the detection value of the second temperature sensor 95 is greater than or equal to the third temperature threshold value and the detection value of the third pressure sensor 93 is less than or equal to the third pressure threshold value, decrease the opening degree of the second throttle device 80 and increase the opening degree of the first throttle device 60. Or, if the ambient temperature detected by the third temperature sensor decreases, the opening degree of the second throttling device 80 is increased and the opening degree of the first throttling device 60 is decreased in the case where the second temperature sensor is smaller than the corresponding fourth temperature threshold value and the detection value of the third pressure sensor is greater than or equal to the fourth pressure threshold value.
Here, the ambient temperature change of the air-side heat exchanger 40 refers to a change in the outdoor ambient temperature of the air-side heat exchanger 40. The ambient temperature can be periodically detected, and the difference value of the ambient temperature of the adjacent periods is calculated, so that the ambient temperature variation trend is obtained. Wherein the trend of the change of the environmental temperature comprises the gradual decrease of the environmental temperature or the gradual increase of the environmental temperature. As shown above, the refrigerant demand of the heat pump air conditioning system varies with different ambient temperatures. Therefore, when the ambient temperature changes, it can be further judged whether the evaporating pressure and the discharge temperature of the compressor satisfy the respective conditions. If the difference is satisfied, the refrigerant quantity is required to be adjusted, and then the opening degrees of the first throttling device 60 and the second throttling device 80 are adjusted. If the current opening degree of the first adjusting device 60 and the second throttling device 80 is not satisfied, the refrigerant quantity does not need to be adjusted, and the current opening degree of the first adjusting device 60 and the second throttling device 80 is maintained. Wherein the evaporation pressure of the compressor 10 is detected by the second pressure sensor 92.
Specifically, when the ambient temperature change condition of the air-side heat exchanger 40 indicates an increase in the ambient temperature, if the evaporation pressure of the compressor 10 is less than or equal to the third pressure threshold value and the discharge temperature is greater than or equal to the third temperature threshold value, the opening degree of the second throttle device 80 is adjusted smaller and the opening degree of the first throttle device 60 is adjusted larger. To reduce the amount of refrigerant entering the liquid storage device 70 and to maintain the evaporating pressure of the compressor 10 constant.
When the ambient temperature change condition of the air-side heat exchanger 40 indicates a decrease in the ambient temperature, if the evaporation pressure of the compressor 10 is greater than or equal to the fourth pressure threshold value and the discharge temperature is less than or equal to the fourth temperature threshold value, the opening degree of the second throttle device 80 is increased and the opening degree of the first throttle device 60 is decreased. To increase the amount of refrigerant entering the liquid storage device 70 and to maintain the evaporating pressure of the compressor 10 constant.
In the embodiment of the disclosure, the ambient temperature T of the air-side heat exchanger is acquired a According to the ambient temperature T a Further judging the evaporation pressure P s And exhaust temperature T d Whether a preset condition is satisfied. If the ambient temperature T a If the change rate of (d) is a negative value and is less than the third predetermined change rate, it indicates that the ambient temperature is decreased and the change is faster. At this time, the system may be in a refrigerant-starved state. Further obtaining the evaporation pressure P s And exhaust temperature T d . If the evaporation pressure P s Less than or equal to a third pressure threshold value P 3 ', and exhaust temperature T d Greater than or equal to a third temperature threshold T d3 ', it is determined that the system is in a refrigerant-lack state. At this time, the opening degree of the second throttle device 80 is adjusted to be small so that the detection value of the first pressure sensor 91 is decreased. Thereby reducing the amount of liquid refrigerant entering the liquid storage device 70 and correspondingly increasing the amount of heating cycle refrigerant. At the same time, the opening degree of the first throttle device 60 is increased. So that the evaporation pressure of the evaporator is kept constant; further, the discharge temperature of the compressor 10 is decreased while the amount of the refrigerant in the refrigeration cycle is increased (the refrigerant flow direction is shown in fig. 3). Therefore, the adjustment of the refrigerant quantity is adaptive to the change of the ambient temperature, and the control precision is improved. The performance of the system is also optimized.
Likewise, if the ambient temperature T a If the change rate of (b) is a positive value and is greater than the fourth preset change rate, it indicates that the ambient temperature is increased and the change is fast. At this time, the system may be in a state of a large amount of refrigerant. Thereby obtaining the evaporation pressure P s And exhaust temperature T d . If the evaporation pressure P s Greater than or equal to a fourth pressure threshold P 4 ', and exhaust temperature T d Less than or equal to a fourth temperature threshold T d4 ' determining that the system is in a state of excessive refrigerants. At this time, the opening degree of the second throttle device 80 is adjusted to be small so that the detection value of the first pressure sensor 91 is reduced. Thereby reducing the amount of liquid refrigerant entering the liquid storage device 70 and correspondingly increasing the amount of heating cycle refrigerant. At the same time, the opening degree of the first throttle device 60 is increased. So that the evaporation pressure of the evaporator is kept constant; further, the discharge temperature of the compressor 10 is increased while the amount of the refrigerant in the refrigeration cycle is decreased (the refrigerant flow direction is shown in fig. 4). Therefore, the adjustment of the refrigerant quantity is adaptive to the change of the outlet water temperature, and the control precision is improved. The performance of the system is also optimized.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify 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. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A heat pump air conditioning system, comprising:
the refrigerant circulating flow path comprises a compressor, a four-way valve, a water side heat exchanger, a first throttling device and an air side heat exchanger;
the refrigerant flow regulating device comprises a liquid storage device and a second throttling device; the liquid storage device is arranged on a refrigerant circulating pipeline between the first throttling device and the water side heat exchanger; the second throttling device is arranged on a refrigerant circulating pipeline between the liquid storage device and the water side heat exchanger.
2. The heat pump air conditioning system of claim 1,
the first throttling device comprises a first electronic expansion valve;
the second throttling means comprises a second electronic expansion valve.
3. The heat pump air conditioning system of claim 1, wherein the refrigerant flow regulating device further comprises:
the first pressure sensor is arranged on a pipeline between the liquid storage device and the first throttling device;
the opening degree of the second throttling device is adjusted, the detection value of the first pressure sensor is changed, and therefore the amount of the refrigerant in the liquid storage device is adjusted.
4. The heat pump air conditioning system according to claim 3, wherein the refrigerant circulation flow path further includes:
the second pressure sensor is arranged at the air return port of the compressor; and when the refrigerant quantity in the liquid storage device is adjusted, the opening degree of the first throttling device is synchronously adjusted, so that the evaporation pressure of the compressor detected by the second pressure sensor is unchanged.
5. The heat pump air conditioning system according to claim 1, wherein the refrigerant circulation flow path further includes:
and the air outlet of the gas-liquid separator is connected with the air return port of the compressor, and the liquid inlet of the gas-liquid separator is connected with one end of the four-way valve.
6. The heat pump air conditioning system of claim 1,
the air-side heat exchanger includes: two air side heat exchangers in parallel.
7. The heat pump air conditioning system according to any one of claims 1 to 6, further comprising:
the first temperature sensor is arranged at a water outlet of the water side heat exchanger and used for detecting the temperature of water;
the second temperature sensor is arranged at the air outlet of the compressor and used for detecting the air exhaust temperature;
and the third pressure sensor is arranged on a refrigerant circulating path connected with the exhaust port of the compressor and the four-way valve and used for detecting the condensation pressure of the compressor.
8. The heat pump air conditioning system of claim 7, further comprising:
the first controller is electrically connected with the first throttling device and the second throttling device; configured to, in the heating mode, if the outlet water temperature detected by the first temperature sensor increases, decrease the opening degree of the second throttling device and increase the opening degree of the first throttling device when the detection values of the second temperature sensor and the third pressure sensor are both greater than or equal to the corresponding first temperature threshold value and first pressure threshold value; or the like, or, alternatively,
and if the outlet water temperature detected by the first temperature sensor is reduced, under the condition that the detection values of the second temperature sensor and the third pressure sensor are both smaller than the corresponding second temperature threshold and the second pressure threshold, the opening degree of the second throttling device is increased, and the opening degree of the first throttling device is decreased.
9. The heat pump air conditioning system according to any one of claims 1 to 6, further comprising:
the second temperature sensor is arranged at the air outlet of the compressor and used for detecting the air outlet temperature;
and the third temperature sensor is arranged at the coil pipe of the air side heat exchanger and used for detecting the ambient temperature.
10. The heat pump air conditioning system of claim 9, further comprising:
the second controller is electrically connected with the first throttling device and the second throttling device; configured to, in the heating mode, if the ambient temperature detected by the third temperature sensor increases, decrease the opening degree of the second throttle device and increase the opening degree of the first throttle device in a case where the detected value of the second temperature sensor is greater than or equal to a third temperature threshold value and the detected value of the third pressure sensor is less than or equal to a third pressure threshold value; or the like, or, alternatively,
and if the ambient temperature detected by the third temperature sensor is reduced, the opening degree of the second throttling device is increased and the opening degree of the first throttling device is decreased under the condition that the second temperature sensor is smaller than the corresponding fourth temperature threshold value and the detection value of the third pressure sensor is larger than or equal to the fourth pressure threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221744875.9U CN218154581U (en) | 2022-07-08 | 2022-07-08 | Heat pump air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221744875.9U CN218154581U (en) | 2022-07-08 | 2022-07-08 | Heat pump air conditioning system |
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| Publication Number | Publication Date |
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| CN218154581U true CN218154581U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221744875.9U Active CN218154581U (en) | 2022-07-08 | 2022-07-08 | Heat pump air conditioning system |
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| Country | Link |
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| CN (1) | CN218154581U (en) |
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2022
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