WO2023147753A1 - 热泵机组及其控制方法 - Google Patents
热泵机组及其控制方法 Download PDFInfo
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- WO2023147753A1 WO2023147753A1 PCT/CN2023/070851 CN2023070851W WO2023147753A1 WO 2023147753 A1 WO2023147753 A1 WO 2023147753A1 CN 2023070851 W CN2023070851 W CN 2023070851W WO 2023147753 A1 WO2023147753 A1 WO 2023147753A1
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- pressure
- superheat
- degree
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- control method
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- 238000000034 method Methods 0.000 title claims abstract description 59
- 239000003507 refrigerant Substances 0.000 claims abstract description 26
- 230000003434 inspiratory effect Effects 0.000 claims description 16
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 230000000875 corresponding effect Effects 0.000 description 13
- 239000000243 solution Substances 0.000 description 12
- 239000007788 liquid Substances 0.000 description 9
- 230000002528 anti-freeze Effects 0.000 description 6
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the invention belongs to the technical field of heat pump heat exchange, and specifically provides a heat pump unit and a control method thereof.
- heat pump units have become an essential heat exchange device in people's lives.
- the technology of heat pump units has developed to a very mature level, there are still some areas for improvement in the existing heat pump units.
- the refrigerant circulation system usually performs corresponding actions such as frequency increase and valve closing.
- excessive frequency increase is easy It leads to the problem of low pressure in the system, and even causes the problem of freezing and cracking in the water system.
- the present invention aims to solve the above-mentioned technical problems, that is, to solve the problem that the existing heat pump units have poor control methods and easily affect the unit’s operational stability.
- the present invention provides a control method for a heat pump unit.
- the heat pump unit includes a refrigerant circulation loop and a first heat exchanger, an inverter compressor, and a second heat exchanger sequentially arranged on the refrigerant circulation loop.
- a heater and a throttling member, the control method includes:
- the operating state of the heat pump unit is selectively adjusted according to the degree of superheat of the exhaust gas and/or the first corrected suction pressure.
- the step of "selectively adjusting the operating state of the heat pump unit according to the exhaust superheat and/or the first corrected suction pressure" includes:
- the operating frequency of the inverter compressor is selectively adjusted according to the degree of superheat of the exhaust gas and the first corrected suction pressure.
- the step of "selectively adjusting the operating frequency of the inverter compressor according to the degree of superheat of the exhaust gas and the first corrected suction pressure" specifically includes:
- discharge superheat degree is less than the first preset superheat degree and greater than or equal to the second preset superheat degree, and the first corrected suction pressure is greater than the first preset pressure, increase the inverter compressor operating frequency.
- control method during the step of "increasing the operating frequency of the inverter compressor", the control method further includes:
- the second preset pressure is lower than the first preset pressure.
- the step of "selectively adjusting the operating state of the heat pump unit according to the exhaust superheat and/or the first corrected suction pressure" further includes:
- An opening degree of the throttle member is selectively adjusted based on the degree of superheat of the exhaust gas and the first corrected suction pressure.
- the step of "selectively adjusting the opening degree of the throttle member according to the exhaust superheat and the first corrected suction pressure" specifically includes:
- the throttle is decreased The opening of the component.
- control method further includes:
- the fourth preset pressure is smaller than the third preset pressure.
- the step of "selectively adjusting the operating state of the heat pump unit according to the exhaust superheat and/or the first corrected suction pressure" further includes:
- the unloading of the variable frequency compressor is selectively controlled.
- the step of "selectively controlling the unloading of the variable frequency compressor according to the degree of superheat of the exhaust gas" specifically includes:
- variable frequency compressor is controlled to be unloaded.
- the present invention also provides a heat pump unit, the heat pump unit includes a controller, and the controller is capable of executing the control method described in any one of the above preferred technical solutions.
- the heat pump unit of the present invention includes a refrigerant circulation circuit and a first heat exchanger, an inverter compressor, a second heat exchanger and a throttling member sequentially arranged on the refrigerant circulation circuit, so that
- the control method includes: obtaining the discharge temperature, discharge pressure and suction pressure of the variable frequency compressor; determining the corresponding saturation temperature according to the discharge pressure of the variable frequency compressor; calculating the discharge temperature and the The difference of the saturation temperature is recorded as the exhaust superheat; the sum of the suction pressure and the corrected pressure is calculated and recorded as the first corrected suction pressure; according to the exhaust superheat and/or the first corrected suction Air pressure to selectively adjust the operating state of the heat pump unit.
- the control method of the present invention can effectively avoid the low pressure problem of the heat pump unit, thereby effectively reducing the possibility of damage to the unit, thereby effectively ensuring the stability of the unit operation.
- Fig. 1 is the overall structure schematic diagram of the heat pump unit of the present invention
- Fig. 2 is the flow chart of main steps of the control method of the present invention.
- Fig. 3 is the specific step flowchart of the preferred embodiment of control method of the present invention.
- Refrigerant circulation loop 111. First heat exchanger; 112. Inverter compressor; 113. Second heat exchanger; 114. Electronic expansion valve; 115. Four-way valve; 116. Gas-liquid separator; 117. Injection Valve; 118, stop valve; 119, unloading valve;
- connection should be understood in a broad sense, for example, it may be directly connected, or indirectly connected through an intermediary, or it may be an internal connection between two components. connected.
- first, second, third, “fourth”, and “fifth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
- FIG. 1 is a schematic diagram of the overall structure of the heat pump unit of the present invention.
- the heat pump unit in this preferred embodiment includes a refrigerant circulation circuit 11 capable of exchanging heat and a water exchange circuit 12.
- the refrigerant circulation circuit 11 is provided with a first A heat exchanger 111, an inverter compressor 112, a second heat exchanger 113, an electronic expansion valve 114 and a four-way valve 115, and a gas-liquid separator 116 is provided at the inlet of the inverter compressor 112.
- An injection valve 117 and a shut-off valve 118 are provided.
- the refrigerant circulates continuously between the first heat exchanger 111 and the second heat exchanger 113 through the refrigerant circulation circuit 11 to realize heat exchange.
- the four-way valve 115 changes direction
- the reverse circulation of the refrigerant in the refrigerant circulation circuit 11 can be controlled, so that the heat pump unit can switch between the cooling mode and the heating mode.
- An unloading valve 119 is also provided in the refrigerant circulation circuit 11 , and the unloading valve 119 and the variable frequency compressor 112 are arranged in parallel so as to relieve the pressure of the variable frequency compressor 112 .
- the present invention does not impose any restrictions on the specific structure of the refrigerant circulation loop 11, and those skilled in the art can set it by themselves according to actual use requirements, as long as the refrigerant circulation loop 11 is provided with a first heat exchanger 111, frequency conversion compression machine 112, the second heat exchanger 113 and the electronic expansion valve 114; and the present invention does not impose any limitation on the specific type of each element, for example, the electronic expansion valve 114 can also be replaced by a combination of a solenoid valve and a capillary tube. Neither is restrictive.
- the refrigerant circulation circuit 11 is also provided with a discharge temperature sensor 101, a discharge pressure sensor 102 and a suction pressure sensor 103, wherein the discharge temperature sensor 101 and the discharge pressure sensor 102 are located at the discharge port of the inverter compressor 112.
- the discharge temperature sensor 101 can detect the discharge temperature of the variable frequency compressor 112
- the discharge pressure sensor 102 can detect the discharge pressure of the variable frequency compressor 112
- the suction pressure sensor 103 is located at the suction end of the variable frequency compressor 112.
- the air pressure sensor 103 can detect the suction pressure of the inverter compressor 112 .
- the air temperature sensor 101 can detect the discharge temperature of the inverter compressor 112
- the discharge pressure sensor 102 can detect the discharge pressure of the inverter compressor 112
- the suction pressure sensor 103 can detect the suction pressure of the inverter compressor 112 .
- the water exchange circuit 12 can exchange heat with the refrigerant in the refrigerant circulation circuit 11 through the first heat exchanger 111, and the water exchange circuit 12 is provided with a water pump 121 and an auxiliary heater 122, and the water pump 121 can provide circulation power , the auxiliary heater 122 can heat the water in the water exchange circuit 12; of course, the water exchange circuit 12 can be a circulating water circuit only for heating, or an open water circuit that can also provide hot water. As a limitation, those skilled in the art can set the specific structure of the water exchange circuit 12 according to actual usage requirements.
- the heat pump unit of the present invention also includes a controller, the controller can acquire the detection data of the suction pressure sensor 103 that can detect the suction pressure of the variable frequency compressor 112, and the controller can also control the heat pump unit
- the operating state for example, controls the frequency of the inverter compressor 112, the opening degree of the electronic expansion valve 114, the opening and closing state of the unloading valve 119, and the like.
- the controller may be the original controller of the heat pump unit, or it may be a controller for implementing the present invention. For the controller whose control method is set separately, technicians can set the structure and model of the controller according to the actual use requirements.
- FIG. 2 this figure is a flow chart of the main steps of the control method of the present invention.
- the control method of the present invention mainly includes the following steps:
- S5 Selectively adjust the operating state of the heat pump unit according to the degree of superheat of the exhaust gas and/or the first corrected suction pressure.
- step S1 the controller can obtain the discharge temperature, discharge pressure and suction pressure of the variable frequency compressor 112 through the discharge temperature sensor 101, discharge pressure sensor 102 and suction pressure sensor 103 as basic parameters .
- step S2 the controller can determine the corresponding saturation temperature according to the exhaust pressure of the variable frequency compressor 112.
- the present invention does not impose any limitation on its specific determination method, and those skilled in the art can determine the corresponding saturation temperature according to actual needs. set up.
- step S3 and S4 After the controller obtains the exhaust temperature, saturation temperature and suction pressure, then execute steps S3 and S4 to calculate the difference between the exhaust temperature and the saturation temperature, which is recorded as the degree of superheat of the exhaust gas; calculation The sum of the suction pressure and the correction pressure is recorded as the first correction suction pressure. It should be noted that the present invention does not impose any restrictions on the specific execution sequence of steps S2 to S4, and those skilled in the art can adjust it according to actual usage requirements, as long as step S2 is before step S3.
- the present invention does not impose any limitation on the specific value of the correction pressure, which can be set by those skilled in the art according to actual use requirements.
- the pressure loss per unit length corresponding to the liquid pipe of the refrigerant circulation circuit 11 is A
- the distance between the stop valve 118 and the first heat exchanger 111 is L
- usually the two stop valves 118 and the first heat exchanger 111 are L.
- the distance between a heat exchanger 111 is the same, if not the same, then adopt the distance between the shut-off valve 118 on the liquid pipe and the first heat exchanger 111; the correction pressure is set to the corresponding value of the liquid pipe.
- the product of the pressure loss A per unit length and the distance L between the shut-off valve 118 and the first heat exchanger 111 is used to effectively improve the accuracy of judgment.
- step S5 the controller selectively adjusts the operating state of the heat pump unit according to the exhaust gas superheat and/or the first corrected suction pressure.
- the present invention does not impose any restrictions on its specific control logic, and those skilled in the art can set it according to actual use requirements; for example, it can be based on the exhaust superheat and/or the first corrected suction pressure
- the adjustment selectively adjusts the frequency of the variable frequency compressor 112 ; as another example, the opening degree of the electronic expansion valve 114 may also be adjusted selectively according to the exhaust gas superheat and/or the first corrected suction pressure.
- FIG. 3 is a flow chart of specific steps of a preferred embodiment of the control method of the present invention.
- the preferred embodiment of the control method of the present invention specifically includes the following steps:
- S103 Calculate the difference between the exhaust gas temperature and the saturation temperature, and record it as the degree of superheat of the exhaust gas
- S104 Calculate the sum of the inspiratory pressure and the corrected pressure, and record it as the first corrected inspiratory pressure
- S105 Selectively adjust the operating frequency of the inverter compressor according to the degree of superheat of the exhaust gas and the first corrected suction pressure
- S106 Selectively adjust the opening of the electronic expansion valve according to the exhaust superheat and the first corrected suction pressure
- S107 Selectively control the unloading of the variable frequency compressor according to the degree of superheat of the exhaust gas.
- step S101 the controller acquires the discharge temperature, discharge pressure and suction pressure of the inverter compressor 112 as basic parameters through the discharge temperature sensor 101 , the discharge pressure sensor 102 and the suction pressure sensor 103 .
- step S102 the controller can determine the corresponding saturation temperature according to the exhaust pressure of the inverter compressor 112.
- the present invention does not impose any limitation on its specific determination method, and those skilled in the art can determine the corresponding saturation temperature according to actual needs. set up.
- step S103 and S104 execute steps S103 and S104 to calculate the difference between the exhaust temperature and the saturation temperature, which is recorded as the degree of superheat of the exhaust gas; calculation The sum of the suction pressure and the correction pressure is recorded as the first correction suction pressure. It should be noted that the present invention does not impose any restrictions on the specific execution sequence of steps S102 to S104, and those skilled in the art can adjust it according to actual usage requirements, as long as step S102 is before step S103.
- the present invention does not impose any limitation on the specific value of the correction pressure, which can be set by those skilled in the art according to actual use requirements.
- the pressure loss per unit length corresponding to the liquid pipe of the refrigerant circulation circuit 11 is A
- the distance between the stop valve 118 and the first heat exchanger 111 is L
- usually the two stop valves 118 and the first heat exchanger 111 are L.
- the distance between a heat exchanger 111 is the same, if not the same, then adopt the distance between the shut-off valve 118 on the liquid pipe and the first heat exchanger 111; the correction pressure is set to the corresponding value of the liquid pipe.
- the product of the pressure loss A per unit length and the distance L between the shut-off valve 118 and the first heat exchanger 111 is used to effectively improve the accuracy of judgment.
- step S105 the controller can selectively adjust the operating frequency of the variable frequency compressor 112 according to the degree of superheat of the exhaust gas and the first corrected suction pressure.
- this step specifically includes: if the exhaust superheat degree is less than the first preset superheat degree and greater than or equal to the second preset superheat degree, and the first corrected suction pressure If the pressure is greater than the first preset pressure, then increase the operating frequency of the variable frequency compressor 112, so as to effectively increase the exhaust superheat and ensure the stable operation of the unit; The needs are set by yourself.
- the present invention does not impose any restrictions on the specific values of the first preset degree of superheat and the second preset degree of superheat, which can be set by those skilled in the art according to actual use requirements; the first The preset superheat degree is preferably set to 25°C, and the second preset superheat degree is preferably set to 20°C.
- the present invention does not impose any restrictions on the specific value of the first preset pressure, which can be set by those skilled in the art according to actual use requirements; as a preferred setting method, the heat pump unit
- the antifreeze pressure point in the liquid pipe is C, and the specific value of this value can be determined according to the actual situation.
- the first preset pressure is preferably set to the antifreeze pressure point C plus 1Bar, so as to effectively improve the control accuracy ; Of course, this is only a preferred setting method, not a restrictive setting method.
- control method further includes: obtaining the suction pressure of the variable frequency compressor 112 again; calculating the obtained suction pressure The sum of pressure and the corrected pressure is recorded as the second corrected suction pressure; if the second corrected suction pressure is less than or equal to the second preset pressure, stop increasing the operating frequency of the variable frequency compressor 112, In order to effectively avoid the problem that the heat pump unit is easily damaged by excessive frequency increase; wherein, the second preset pressure is lower than the first preset pressure.
- the present invention does not impose any restrictions on the specific value of the second preset pressure, and those skilled in the art can set it according to actual use requirements, as long as the second preset pressure is lower than the first preset pressure. It only needs to set the pressure, and the second preset pressure is preferably set to the antifreeze pressure point C plus 0.2 Bar.
- the The opening of the electronic expansion valve 114 is adjusted so as to adjust the demand of the whole unit according to the degree of superheat of the exhaust gas, thereby effectively improving the reliability of the heat pump unit.
- step S106 the controller can selectively adjust the opening degree of the electronic expansion valve 114 according to the degree of superheat of the exhaust gas and the first corrected suction pressure.
- this step specifically includes: if the exhaust superheat degree is less than the second preset superheat degree and greater than or equal to the third preset superheat degree, and the first corrected suction pressure If it is greater than the third preset pressure, then reduce the opening of the electronic expansion valve 114 , and try to maintain the corrected suction pressure always greater than the third preset pressure during the adjustment process.
- the third preset The pressure is preferably set to the antifreeze pressure point C plus 0.2 Bar, and the third preset degree of superheat is preferably set to 15°C.
- control method further includes: obtaining the suction pressure of the frequency conversion compressor 112 again; then, calculating the obtained again The sum of the suction pressure and the correction pressure is recorded as the third correction suction pressure; if the third correction suction pressure is less than the fourth preset pressure, stop reducing the opening of the electronic expansion valve 114 , that is, maintain the current opening of the electronic expansion valve 114 so as to effectively prevent freezing; wherein, the fourth preset pressure is lower than the third preset pressure.
- the present invention does not impose any restrictions on the specific value of the fourth preset pressure, and those skilled in the art can set it according to actual use requirements, as long as the fourth preset pressure is lower than the third preset pressure. It only needs to set the pressure, and the fourth preset pressure is preferably set to the antifreeze pressure point C plus 0.1 Bar.
- step S107 the controller can selectively control the variable frequency compressor 112 to unload according to the degree of superheat of the exhaust gas.
- this step specifically includes: if the exhaust superheat degree is less than the third preset superheat degree, controlling the variable frequency compressor 112 to unload.
- the corrected suction pressure should always be kept at a level greater than the antifreeze pressure point C, so as to effectively ensure that the heat pump unit will not be damaged by freezing.
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Abstract
一种热泵机组及其控制方法，该热泵机组包括冷媒循环回路（11）以及依次设置在冷媒循环回路（11）上的第一换热器（111）、变频压缩机（112）、第二换热器（113）和节流构件（114）。控制方法包括：获取变频压缩机（112）的排气温度、排气压力和吸气压力；根据变频压缩机（112）的排气压力确定其对应的饱和温度；计算排气温度和饱和温度的差值，记为排气过热度；计算吸气压力和修正压力的和，记为第一修正吸气压力；根据排气过热度和/或第一修正吸气压力，选择性地调节热泵机组的运行状态，以避免热泵机组出现低压偏低的问题。
Description
本申请要求2022年2月7日提交的、发明名称为“热泵机组及其控制方法”的中国专利申请CN202210116765.6的优先权，上述中国专利申请的全部内容通过引用并入本申请中。
本发明属于热泵换热技术领域，具体提供一种热泵机组及其控制方法。
随着人们生活水平的不断提高，人们对生活环境也提出了越来越高的要求。为了维持舒适的环境温度，热泵机组已经成为人们生活中必不可少的一种换热设备。近年来，虽然热泵机组技术已经发展到十分成熟的地步，但现有热泵机组依然存在一些需要改进的地方。例如，在热泵机组运行频率较低时，容易出现排气温度短时间偏低的情况，在此情形下，通常冷媒循环系统会相应执行升频、关阀等动作，但是，过度升频又容易导致系统低压过低的问题，甚至导致水系统出现冻裂的问题，而如果在出现系统低压过低的现象时直接进行停机保护则又会影响到用户的正常使用。现有机组在高频运行时，待排气温度上升至预设温度后就会执行降频操作，这种控制逻辑虽然可以解决排气温度较低的问题，但对于低温制热情形，高频运行很容易造成机组提前结霜，甚至给有热水供应需求的机组带来水路冻结的问题。
相应地，本领域需要一种新的热泵机组及其控制方法来解决上述问题。
发明内容
本发明旨在解决上述技术问题，即，解决现有热泵机组的控制方式 不佳而容易影响机组运行稳定性的问题。
在第一方面，本发明提供一种用于热泵机组的控制方法，所述热泵机组包括冷媒循环回路以及依次设置在所述冷媒循环回路上的第一换热器、变频压缩机、第二换热器和节流构件，所述控制方法包括：
获取所述变频压缩机的排气温度、排气压力和吸气压力；
根据所述变频压缩机的排气压力确定其对应的饱和温度；
计算所述排气温度和所述饱和温度的差值，记为排气过热度；
计算所述吸气压力和修正压力的和，记为第一修正吸气压力；
根据所述排气过热度和/或所述第一修正吸气压力，选择性地调节所述热泵机组的运行状态。
在上述控制方法的优选技术方案中，“根据所述排气过热度和/或所述第一修正吸气压力，选择性地调节所述热泵机组的运行状态”的步骤包括：
根据所述排气过热度和所述第一修正吸气压力，选择性地调节所述变频压缩机的运行频率。
在上述控制方法的优选技术方案中，“根据所述排气过热度和所述第一修正吸气压力，选择性地调节所述变频压缩机的运行频率”的步骤具体包括：
如果所述排气过热度小于第一预设过热度且大于或等于第二预设过热度，并且所述第一修正吸气压力大于第一预设压力，则增大所述变频压缩机的运行频率。
在上述控制方法的优选技术方案中，在执行“增大所述变频压缩机的运行频率”的步骤的过程中，所述控制方法还包括：
再次获取所述变频压缩机的吸气压力；
计算再次获取到的所述吸气压力和所述修正压力的和，记为第二修正吸气压力；
如果所述第二修正吸气压力小于或等于第二预设压力，则停止增大所述变频压缩机的运行频率；
其中，所述第二预设压力小于所述第一预设压力。
在上述控制方法的优选技术方案中，“根据所述排气过热度和/或所述 第一修正吸气压力，选择性地调节所述热泵机组的运行状态”的步骤还包括：
根据所述排气过热度和所述第一修正吸气压力，选择性地调节所述节流构件的开度。
在上述控制方法的优选技术方案中，“根据所述排气过热度和所述第一修正吸气压力，选择性地调节所述节流构件的开度”的步骤具体包括：
如果所述排气过热度小于所述第二预设过热度且大于或等于第三预设过热度，并且所述第一修正吸气压力大于第三预设压力，则减小所述节流构件的开度。
在上述控制方法的优选技术方案中，在执行“减小所述节流构件的开度”的步骤的过程中，所述控制方法还包括：
又一次获取所述变频压缩机的吸气压力；
计算又一次获取到的所述吸气压力和所述修正压力的和，记为第三修正吸气压力；
如果所述第三修正吸气压力小于第四预设压力，则停止减小所述节流构件的开度；
其中，所述第四预设压力小于所述第三预设压力。
在上述控制方法的优选技术方案中，“根据所述排气过热度和/或所述第一修正吸气压力，选择性地调节所述热泵机组的运行状态”的步骤还包括：
根据所述排气过热度，选择性地控制所述变频压缩机卸载。
在上述控制方法的优选技术方案中，“根据所述排气过热度，选择性地控制所述变频压缩机卸载”的步骤具体包括：
如果所述排气过热度小于所述第三预设过热度，则控制所述变频压缩机卸载。
在第二方面，本发明还提供了一种热泵机组，所述热泵机组包括控制器，所述控制器能够执行上述任一项优选技术方案中所述的控制方法。
在采用上述技术方案的情况下，本发明的热泵机组包括冷媒循环回路以及依次设置在所述冷媒循环回路上的第一换热器、变频压缩机、第二换热器和节流构件，所述控制方法包括：获取所述变频压缩机的排气 温度、排气压力和吸气压力；根据所述变频压缩机的排气压力确定其对应的饱和温度；计算所述排气温度和所述饱和温度的差值，记为排气过热度；计算所述吸气压力和修正压力的和，记为第一修正吸气压力；根据所述排气过热度和/或所述第一修正吸气压力，选择性地调节所述热泵机组的运行状态。基于上述控制方式，本发明的控制方法能够有效避免热泵机组出现低压偏低的问题，从而有效降低机组损坏的可能性，进而有效保证机组运行的稳定性。
下面结合附图来描述本发明的优选实施方式，附图中：
图1是本发明的热泵机组的整体结构示意图；
图2是本发明的控制方法的主要步骤流程图；
图3是本发明的控制方法的优选实施例的具体步骤流程图；
附图标记：
11、冷媒循环回路；111、第一换热器；112、变频压缩机；113、第二换热器；114、电子膨胀阀；115、四通阀；116、气液分离器；117、喷射阀；118、截止阀；119、卸载阀；
12、换热水回路；121、水泵；122、辅助加热器；
101、排气温度传感器；102、排气压力传感器；103、吸气压力传感器。
下面参照附图来描述本发明的优选实施方式。本领域技术人员应当理解的是，这些实施方式仅用于解释本发明的技术原理，并非旨在限制本发明的保护范围。本领域技术人员可以根据需要对其作出调整，以便适应具体的应用场合。例如，虽然本优选实施例中所述的热泵机组包括换热水回路，但这并不是限制性的，所述热泵机组还可以仅包括冷媒循环回路。这种有关热泵机组的具体类型的改变并不偏离本发明的基本原理，应当属于本发明的保护范围。
需要说明的是，在本优选实施方式的描述中，术语“左”、“右”、 “内”、“外”等指示的方向或位置关系的术语是基于附图所示的方向或位置关系，这仅仅是为了便于描述，而不是指示或暗示所述装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
此外，在本发明的描述中，除非另有明确的规定和限定，术语“相连”应做广义理解，例如，可以是直接相连，也可以通过中间媒介间接相连，还可以是两个元件内部的连通。此外，术语“第一”、“第二”、“第三”、“第四”、“第五”仅用于描述目的，而不能理解为指示或暗示相对重要性。对于本领域技术人员而言，可根据具体情况理解上述术语在本发明中的具体含义。
另外，还需要说明的是，尽管本申请中按照特定顺序描述了本发明的控制方法的各个步骤，但是这些顺序并不是限制性的，在不偏离本发明的基本原理的前提下，本领域技术人员可以按照不同的顺序来执行所述步骤。
首先参阅图1，该图是本发明的热泵机组的整体结构示意图。如图1所示，本优选实施例中的热泵机组包括能够换热的冷媒循环回路11和换热水回路12，当然，也可以仅包括冷媒循环回路11，冷媒循环回路11上设置有第一换热器111、变频压缩机112、第二换热器113、电子膨胀阀114和四通阀115，并且变频压缩机112的入口处还设置有气液分离器116，冷媒循环回路11上还设置有喷射阀117和截止阀118，基于此，冷媒通过冷媒循环回路11在第一换热器111和第二换热器113之间不断循环流通以实现换热，四通阀115换向时能够控制冷媒循环回路11中的冷媒逆循环，以使所述热泵机组在制冷工况和制热工况之间转换。冷媒循环回路11中还设置有卸载阀119，卸载阀119和变频压缩机112呈并联设置，以便给变频压缩机112泄压。还需要说明的是，本发明不对冷媒循环回路11的具体结构作任何限制，本领域技术人员可以根据实际使用需求自行设定，只要冷媒循环回路11上设置有第一换热器111、变频压缩机112、第二换热器113和电子膨胀阀114即可；并且，本发明也不对各个元件的具体类型作任何限制，例如，电子膨胀阀114还可以采用电磁阀和毛细管的组合替代，这都不是限制性的。
进一步地，冷媒循环回路11上还设置有排气温度传感器101、排气压力传感器102和吸气压力传感器103，其中，排气温度传感器101和排气压力传感器102位于变频压缩机112的排气端，排气温度传感器101能够检测变频压缩机112的排气温度，排气压力传感器102能够检测变频压缩机112的排气压力，吸气压力传感器103位于变频压缩机112的吸气端，吸气压力传感器103能够检测变频压缩机112的吸气压力。需要说明的是，本发明不对排气温度传感器101、排气压力传感器102和吸气压力传感器103的具体类型和设置位置作任何限制，本领域技术人员可以根据实际使用需求自行设定，只要排气温度传感器101能够检测变频压缩机112的排气温度，排气压力传感器102能够检测变频压缩机112的排气压力，吸气压力传感器103能够检测变频压缩机112的吸气压力即可。
另外，换热水回路12能够通过第一换热器111与冷媒循环回路11中的冷媒进行换热，并且换热水回路12上设置有水泵121和辅助加热器122，水泵121能够提供循环动力，辅助加热器122能够加热换热水回路12中的水；当然，换热水回路12可以是仅用于供热的循环水回路，也可以是还能够提供热水的开放水路，这并不是限制性的，本领域技术人员可以根据实际使用需求自行设定换热水回路12的具体结构。
此外，本发明的热泵机组还包括控制器，所述控制器能够获取吸气压力传感器103能够检测变频压缩机112的吸气压力的检测数据，并且所述控制器还能够控制所述热泵机组的运行状态，例如，控制变频压缩机112的频率、电子膨胀阀114的开度、卸载阀119的开闭状态等。本领域技术人员能够理解的是，本发明不对所述控制器的具体结构和型号作任何限制，并且所述控制器可以是所述热泵机组原有的控制器，也可以是为执行本发明的控制方法单独设置的控制器，技术人员可以根据实际使用需求自行设定所述控制器的结构和型号。
接着参阅图2，该图是本发明的控制方法的主要步骤流程图。如图2所示，基于上述实施例中所述的热泵机组，本发明的控制方法主要包括下列步骤：
S1：获取变频压缩机的排气温度、排气压力和吸气压力；
S2：根据变频压缩机的排气压力确定其对应的饱和温度；
S3：计算排气温度和饱和温度的差值，记为排气过热度；
S4：计算吸气压力和修正压力的和，记为第一修正吸气压力；
S5：根据排气过热度和/或第一修正吸气压力，选择性地调节热泵机组的运行状态。
在步骤S1中，所述控制器能够通过排气温度传感器101、排气压力传感器102和吸气压力传感器103获取变频压缩机112的排气温度、排气压力和吸气压力，以作为基础参数。接着，在步骤S2中，所述控制器能够根据变频压缩机112的排气压力确定其对应的饱和温度，当然，本发明不对其具体确定方式作任何限制，本领域技术人员可以根据实际需求自行设定。
在所述控制器获取到排气温度、饱和温度和吸气压力后，接着执行步骤S3和步骤S4，计算所述排气温度和所述饱和温度的差值，记为排气过热度；计算所述吸气压力和所述修正压力的和，记为第一修正吸气压力。需要说明的是，本发明不对步骤S2至步骤S4的具体执行顺序作任何限制，本领域技术人员可以根据实际使用需求自行调整，只要步骤S2位于步骤S3之前即可。
此外，还需要说明的是，本发明不对所述修正压力的具体取值作任何限制，本领域技术人员可以根据实际使用需求自行设定。作为一种优选设定方式，冷媒循环回路11的液管对应的单位长度的压损为A，截止阀118和第一换热器111之间的距离为L，通常两个截止阀118和第一换热器111之间的距离是相同的，如不相同，则采用位于液管上的截止阀118和第一换热器111之间的距离；所述修正压力设定为液管对应的单位长度的压损A与截止阀118和第一换热器111之间的距离L的乘积，以便有效提升判断的准确性。
进一步地，在步骤S5中，所述控制器根据所述排气过热度和/或所述第一修正吸气压力，选择性地调节所述热泵机组的运行状态。需要说明的是，本发明不对其具体控制逻辑作任何限制，本领域技术人员可以根据实际使用需求自行设定；例如，可以根据所述排气过热度和/或所述第一修正吸气压力调节选择性地调节变频压缩机112的频率；又例如，还 可以根据所述排气过热度和/或所述第一修正吸气压力调节选择性地电子膨胀阀114的开度。
接着参阅图3，该图是本发明的控制方法的优选实施例的具体步骤流程图。如图3所示，基于上述优选实施例中所述的热泵机组，本发明的控制方法的优选实施例具体包括下列步骤：
S101：获取变频压缩机的排气温度、排气压力和吸气压力；
S102：根据变频压缩机的排气压力确定其对应的饱和温度；
S103：计算排气温度和饱和温度的差值，记为排气过热度；
S104：计算吸气压力和修正压力的和，记为第一修正吸气压力；
S105：根据排气过热度和第一修正吸气压力，选择性地调节变频压缩机的运行频率；
S106：根据排气过热度和第一修正吸气压力，选择性地调节电子膨胀阀的开度；
S107：根据排气过热度，选择性地控制变频压缩机卸载。
在步骤S101中，所述控制器通过排气温度传感器101、排气压力传感器102和吸气压力传感器103获取变频压缩机112的排气温度、排气压力和吸气压力，以作为基础参数。接着，在步骤S102中，所述控制器能够根据变频压缩机112的排气压力确定其对应的饱和温度，当然，本发明不对其具体确定方式作任何限制，本领域技术人员可以根据实际需求自行设定。
在所述控制器获取到排气温度、饱和温度和吸气压力后，接着执行步骤S103和步骤S104，计算所述排气温度和所述饱和温度的差值，记为排气过热度；计算所述吸气压力和所述修正压力的和，记为第一修正吸气压力。需要说明的是，本发明不对步骤S102至步骤S104的具体执行顺序作任何限制，本领域技术人员可以根据实际使用需求自行调整，只要步骤S102位于步骤S103之前即可。
此外，还需要说明的是，本发明不对所述修正压力的具体取值作任何限制，本领域技术人员可以根据实际使用需求自行设定。作为一种优选设定方式，冷媒循环回路11的液管对应的单位长度的压损为A，截止阀118和第一换热器111之间的距离为L，通常两个截止阀118和第一换 热器111之间的距离是相同的，如不相同，则采用位于液管上的截止阀118和第一换热器111之间的距离；所述修正压力设定为液管对应的单位长度的压损A与截止阀118和第一换热器111之间的距离L的乘积，以便有效提升判断的准确性。
具体地，在步骤S105中，所述控制器能够根据所述排气过热度和所述第一修正吸气压力，选择性地调节变频压缩机112的运行频率。作为一种优选控制方式，该步骤具体包括：如果所述排气过热度小于所述第一预设过热度且大于或等于所述第二预设过热度，并且所述第一修正吸气压力大于所述第一预设压力，则增大变频压缩机112的运行频率，以便有效提升排气过热度，保证机组的稳定运行；当然，运行频率的具体增大方式可以由本领域技术人员根据实际需求自行设定。需要说明的是，本发明不对所述第一预设过热度和所述第二预设过热度的具体取值作任何限制，本领域技术人员可以根据实际使用需求自行设定；所述第一预设过热度优选设定为25℃，所述第二预设过热度优选设定为20℃。
另外，还需要说明的是，本发明不对所述第一预设压力的具体取值作任何限制，本领域技术人员可以根据实际使用需求自行设定；作为一种优选设置方式，所述热泵机组的液管中的防冻压力点为C，这个值的具体取值可以根据实际情况自行测定，所述第一预设压力优选设定为防冻压力点C加上1Bar，以便有效提升控制的精准度；当然，这仅仅是一种优选设定方式，而并非限制性的设定方式。
进一步地，在执行“增大所述变频压缩机的运行频率”的步骤的过程中，所述控制方法还包括：再次获取变频压缩机112的吸气压力；计算再次获取到的所述吸气压力和所述修正压力的和，记为第二修正吸气压力；如果所述第二修正吸气压力小于或等于所述第二预设压力，则停止增大变频压缩机112的运行频率，以便有效避免过度升频容易对所述热泵机组造成损伤的问题；其中，所述第二预设压力小于所述第一预设压力。需要说明的是，本发明不对所述第二预设压力的具体取值作任何限制，本领域技术人员可以根据实际使用需求自行设定，只要所述第二预设压力小于所述第一预设压力即可，所述第二预设压力优选设定为防冻压力点C加上0.2Bar。
作为一种优选控制方式，在停止增大变频压缩机112的运行频率的情形下，如果出现变频压缩机112的排气过热度小于所述第二预设过热度的情况，则还可以进一步对电子膨胀阀114的开度进行调节，以便同时根据排气过热度来调整整机需求，进而有效提升所述热泵机组的可靠性。在此情形下，获取变频压缩机112的吸气压力，并计算获取到的所述吸气压力和所述修正压力的和，如果获取到的所述吸气压力和所述修正压力的和大于所述第二预设压力，则减小电子膨胀阀114的开度，以便结合调节电子膨胀阀114的方式来调节机组运行状态，并且在调节过程中尽量维持修正吸气压力始终大于所述第二预设压力。优选采用调整目标过热度的方式来控制电子膨胀阀114的开度的减小速度，具体为以每分钟增大1℃的速度来调整目标过热度，进而调整电子膨胀阀114的开度的减小速度。
具体地，在步骤S106中，所述控制器能够根据所述排气过热度和所述第一修正吸气压力，选择性地调节电子膨胀阀114的开度。作为一种优选控制方式，该步骤具体包括：如果所述排气过热度小于所述第二预设过热度且大于或等于所述第三预设过热度，并且所述第一修正吸气压力大于所述第三预设压力，则减小电子膨胀阀114的开度，并且在调节过程中尽量维持修正吸气压力始终大于所述第三预设压力。优选采用调整目标过热度的方式来控制电子膨胀阀114的开度的减小速度，具体为以每分钟增大1℃的速度来调整目标过热度，进而调整电子膨胀阀114的开度的减小速度。需要说明的是，本发明不对所述第三预设压力和所述第三预设过热度的具体取值作任何限制，本领域技术人员可以根据实际使用需求自行设定，所述第三预设压力优选设定为防冻压力点C加上0.2Bar，所述第三预设过热度优选设定为15℃。
另外，在执行“减小所述节流构件的开度”的步骤的过程中，所述控制方法还包括：又一次获取变频压缩机112的吸气压力；接着，计算又一次获取到的所述吸气压力和所述修正压力的和，记为第三修正吸气压力；如果所述第三修正吸气压力小于所述第四预设压力，则停止减小电子膨胀阀114的开度，即维持电子膨胀阀114的当前开度，以便有效起到防冻结效果；其中，所述第四预设压力小于所述第三预设压力。需要 说明的是，本发明不对所述第四预设压力的具体取值作任何限制，本领域技术人员可以根据实际使用需求自行设定，只要所述第四预设压力小于所述第三预设压力即可，所述第四预设压力优选设定为防冻压力点C加上0.1Bar。
具体地，在步骤S107中，所述控制器能够根据所述排气过热度，选择性地控制变频压缩机112卸载。作为一种优选控制方式，该步骤具体包括：如果所述排气过热度小于所述第三预设过热度，则控制变频压缩机112卸载。
此外，在所述热泵机组的运行过程中，修正吸气压力应当始终保持在大于防冻压力点C的水平，以便有效保证所述热泵机组不会出现冻结损坏的问题。
还需要说明的是，除上述提及到的情形，其他情形均按照所述热泵机组的原有控制逻辑运行即可，本发明不对其他情形下的具体控制步骤作任何限制，本领域技术人员可以根据实际使用需求自行设定。
至此，已经结合附图所示的优选实施方式描述了本发明的技术方案，但是，本领域技术人员容易理解的是，本发明的保护范围显然不局限于这些具体实施方式。在不偏离本发明的原理的前提下，本领域技术人员可以对相关技术特征作出等同的更改或替换，这些更改或替换之后的技术方案都将落入本发明的保护范围之内。
Claims (10)
- 一种用于热泵机组的控制方法，其特征在于，所述热泵机组包括冷媒循环回路以及依次设置在所述冷媒循环回路上的第一换热器、变频压缩机、第二换热器和节流构件，所述控制方法包括：获取所述变频压缩机的排气温度、排气压力和吸气压力；根据所述变频压缩机的排气压力确定其对应的饱和温度；计算所述排气温度和所述饱和温度的差值，记为排气过热度；计算所述吸气压力和修正压力的和，记为第一修正吸气压力；根据所述排气过热度和/或所述第一修正吸气压力，选择性地调节所述热泵机组的运行状态。
- 根据权利要求1所述的控制方法，其特征在于，“根据所述排气过热度和/或所述第一修正吸气压力，选择性地调节所述热泵机组的运行状态”的步骤包括：根据所述排气过热度和所述第一修正吸气压力，选择性地调节所述变频压缩机的运行频率。
- 根据权利要求2所述的控制方法，其特征在于，“根据所述排气过热度和所述第一修正吸气压力，选择性地调节所述变频压缩机的运行频率”的步骤具体包括：如果所述排气过热度小于第一预设过热度且大于或等于第二预设过热度，并且所述第一修正吸气压力大于第一预设压力，则增大所述变频压缩机的运行频率。
- 根据权利要求3所述的控制方法，其特征在于，在执行“增大所述变频压缩机的运行频率”的步骤的过程中，所述控制方法还包括：再次获取所述变频压缩机的吸气压力；计算再次获取到的所述吸气压力和所述修正压力的和，记为第二修正吸气压力；如果所述第二修正吸气压力小于或等于第二预设压力，则停止增大所述变频压缩机的运行频率；其中，所述第二预设压力小于所述第一预设压力。
- 根据权利要求3所述的控制方法，其特征在于，“根据所述排气过热度和/或所述第一修正吸气压力，选择性地调节所述热泵机组的运行状态”的步骤还包括：根据所述排气过热度和所述第一修正吸气压力，选择性地调节所述节流构件的开度。
- 根据权利要求5所述的控制方法，其特征在于，“根据所述排气过热度和所述第一修正吸气压力，选择性地调节所述节流构件的开度”的步骤具体包括：如果所述排气过热度小于所述第二预设过热度且大于或等于第三预设过热度，并且所述第一修正吸气压力大于第三预设压力，则减小所述节流构件的开度。
- 根据权利要求6所述的控制方法，其特征在于，在执行“减小所述节流构件的开度”的步骤的过程中，所述控制方法还包括：又一次获取所述变频压缩机的吸气压力；计算又一次获取到的所述吸气压力和所述修正压力的和，记为第三修正吸气压力；如果所述第三修正吸气压力小于第四预设压力，则停止减小所述节流构件的开度；其中，所述第四预设压力小于所述第三预设压力。
- 根据权利要求6所述的控制方法，其特征在于，“根据所述排气过热度和/或所述第一修正吸气压力，选择性地调节所述热泵机组的运行状态”的步骤还包括：根据所述排气过热度，选择性地控制所述变频压缩机卸载。
- 根据权利要求8所述的控制方法，其特征在于，“根据所述排气过热度，选择性地控制所述变频压缩机卸载”的步骤具体包括：如果所述排气过热度小于所述第三预设过热度，则控制所述变频压缩机卸载。
- 一种热泵机组，其特征在于，所述热泵机组包括控制器，所述控制器能够执行权利要求1至9中任一项所述的控制方法。
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