CN115900146A - Mode switching detection method, device, equipment and storage medium - Google Patents
Mode switching detection method, device, equipment and storage medium Download PDFInfo
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- CN115900146A CN115900146A CN202211466384.7A CN202211466384A CN115900146A CN 115900146 A CN115900146 A CN 115900146A CN 202211466384 A CN202211466384 A CN 202211466384A CN 115900146 A CN115900146 A CN 115900146A
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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
Abstract
The invention relates to the technical field of heat pump detection, and discloses a mode switching detection method, device and equipment and a storage medium, which are used for realizing mode switching self-detection. The mode switching detection method comprises the following steps: responding to a fault restart instruction, and detecting each load based on the fault restart instruction; if all the loads are in a normal running state, detecting the first four-way valve; and if the first four-way valve is not switched to the target state, controlling the first four-way valve to be switched to the target state.
Description
Technical Field
The invention relates to the technical field of heat pump detection, in particular to a mode switching detection method, device, equipment and storage medium.
Background
The triple heat pump unit is one kind of air conditioner water heater with air as cold (heat) source to provide indoor space with heating, refrigerating, life hot water and other functions. The four-way valve is one of important components of the heat pump unit, and the heat pump unit switches three modes of heating, refrigerating and domestic hot water through the four-way valve, so that different requirements of users are met.
However, in the process of switching between the cooling and heating water modes and the heating and cooling water mode, and because two four-way valves need to be controlled to operate in a mutually matched manner, the situation that one of the four-way valves fails to switch due to too small high-low pressure difference of the refrigerant easily occurs, so that the equipment is restarted, and the equipment after being restarted easily judges that the heat pump unit has completed switching of the four-way valves by mistake.
Disclosure of Invention
The invention provides a mode switching detection method, a mode switching detection device and a mode switching detection storage medium, which are used for realizing self-detection of mode switching.
The first aspect of the present invention provides a method for detecting mode switching, including: responding to a fault restart instruction, and detecting each load based on the fault restart instruction; if all the loads are in a normal running state, detecting the first four-way valve; and if the first four-way valve is not switched to the target state, controlling the first four-way valve to be switched to the target state.
In a possible implementation manner, the detecting the first four-way valve if each of the loads is in a normal operation state includes: if all the loads are in a normal running state, acquiring a first pressure value between the first four-way valve and the second four-way valve; acquiring a second pressure value between the second four-way valve and the compressor; calculating a first pressure difference between the first pressure value and the second pressure value; if the first pressure difference value is larger than a first threshold value, determining that the first four-way valve is not switched to a target state; and if the first pressure difference value is smaller than or equal to the first threshold value, determining that the first four-way valve is switched to the target state.
In a possible implementation manner, the detecting the first four-way valve if each of the loads is in a normal operation state includes: if all the loads are in a normal running state, acquiring a third pressure value of the first four-way valve under a first preset condition; acquiring a fourth pressure value of the first four-way valve under a second preset condition; calculating a second pressure difference value between the third pressure value and the fourth pressure value; if the second pressure difference value is smaller than or equal to a second threshold value, determining that the first four-way valve is not switched to a target state; and if the second pressure difference value is larger than the second threshold value, determining that the first four-way valve is switched to the target state.
In a possible implementation manner, the detecting the first four-way valve if each of the loads is in a normal operation state includes: if all the loads are in a normal running state, acquiring a return air temperature value of the compressor; if the return air temperature value is larger than a preset return air temperature value, determining that the first four-way valve is not switched to a target state; and if the return air temperature value is less than or equal to the preset return air temperature value, determining that the first four-way valve is switched to the target state.
In a possible implementation manner, the detecting the first four-way valve if each of the loads is in a normal operation state includes: if all the loads are in a normal running state, judging whether a target control signal corresponding to the first four-way valve exists or not; if the target control signal exists, acquiring a return air pressure value of the compressor; if the return air pressure value is larger than a preset return air pressure value, determining that the first four-way valve is not switched to a target state; and if the return air pressure value is less than or equal to the preset return air pressure value, determining that the first four-way valve is switched to the target state.
In a possible implementation manner, before the detecting, in response to the fault restart instruction, each load based on the fault restart instruction, the method further includes: responding to a mode switching instruction, wherein the mode switching instruction is used for instructing the heat pump unit to switch a refrigerating and heating water mode to a heating water mode; performing fault shutdown detection on the mode switching process based on the mode switching instruction; if a fault shutdown state exists in the mode switching process, controlling the heat pump unit to restart when the preset duration is over, and generating the fault restart instruction; and when the heat pump unit is restarted, controlling the heat pump unit to operate the refrigerating and heating water mode, and switching the refrigerating and heating water mode to the heating water mode based on the mode switching instruction.
In one possible embodiment, the controlling the first four-way valve to switch to the target state if the first four-way valve is not switched to the target state includes: if the first four-way valve is not switched to the target state, controlling the compressor to perform frequency reduction, and performing power-on operation on the second four-way valve to reduce the frequency of the compressor to a target high-low pressure difference, wherein the target high-low pressure difference meets the switching condition of the first four-way valve; controlling the first four-way valve to be switched to the target state based on the target high-low pressure difference meeting the switching condition of the first four-way valve; and responding to an instruction of switching the first four-way valve to the target state, controlling the compressor to perform frequency-up operation, and performing power-off operation on the second four-way valve.
A second aspect of the present invention provides a mode switching detection apparatus, including: the load detection module is used for responding to a fault restart instruction and detecting each load based on the fault restart instruction; a four-way valve detection module for detecting the first four-way valve if each load is in a normal operation state; and the control module is used for controlling the first four-way valve to be switched to the target state if the first four-way valve is not switched to the target state.
In a feasible implementation manner, the four-way valve detection module is specifically configured to: if all the loads are in a normal running state, acquiring a first pressure value between the first four-way valve and the second four-way valve; acquiring a second pressure value between the second four-way valve and the compressor; calculating a first pressure difference between the first pressure value and the second pressure value; if the first pressure difference value is larger than a first threshold value, determining that the first four-way valve is not switched to a target state; and if the first pressure difference value is smaller than or equal to the first threshold value, determining that the first four-way valve is switched to the target state.
In a feasible implementation manner, the four-way valve detection module is specifically configured to: if all the loads are in a normal running state, acquiring a third pressure value of the first four-way valve under a first preset condition; acquiring a fourth pressure value of the first four-way valve under a second preset condition; calculating a second pressure difference value between the third pressure value and the fourth pressure value; if the second pressure difference value is smaller than or equal to a second threshold value, determining that the first four-way valve is not switched to a target state; and if the second pressure difference value is larger than the second threshold value, determining that the first four-way valve is switched to the target state.
In a feasible implementation manner, the four-way valve detection module is specifically configured to: if all the loads are in a normal running state, acquiring a return air temperature value of the compressor; if the return air temperature value is larger than a preset return air temperature value, determining that the first four-way valve is not switched to a target state; and if the return air temperature value is less than or equal to the preset return air temperature value, determining that the first four-way valve is switched to the target state.
In a feasible implementation manner, the four-way valve detection module is specifically configured to: if all the loads are in a normal running state, judging whether a target control signal corresponding to the first four-way valve exists or not; if the target control signal exists, acquiring a return air pressure value of the compressor; if the return air pressure value is larger than a preset return air pressure value, determining that the first four-way valve is not switched to a target state; and if the return air pressure value is less than or equal to the preset return air pressure value, determining that the first four-way valve is switched to the target state.
In a possible embodiment, the mode switching detection device further includes: the response module is used for responding to a mode switching instruction, and the mode switching instruction is used for instructing the heat pump unit to switch a refrigerating and heating water mode to a heating water mode; the shutdown detection module is used for carrying out fault shutdown detection on the mode switching process based on the mode switching instruction; the restarting module is used for controlling the heat pump unit to restart when the preset duration is finished and generating the fault restarting instruction if the fault shutdown state exists in the mode switching process; and the operation module is used for controlling the heat pump unit to operate the refrigeration and heating water mode when the heat pump unit is restarted, and switching the refrigeration and heating water mode to the heating water mode based on the mode switching instruction.
In a possible embodiment, the control module is specifically configured to: if the first four-way valve is not switched to a target state, controlling the compressor to perform frequency reduction, and performing power-on operation on the second four-way valve to reduce the frequency of the compressor to a target high-low pressure difference, wherein the target high-low pressure difference meets the switching condition of the first four-way valve; controlling the first four-way valve to be switched to the target state based on the target high-low pressure difference meeting the switching condition of the first four-way valve; and responding to an instruction of switching the first four-way valve to the target state, controlling the compressor to perform frequency-up operation, and performing power-off operation on the second four-way valve.
A third aspect of the present invention provides a device for detecting mode switching, including: a memory and at least one processor, the memory having instructions stored therein; the at least one processor invokes the instructions in the memory to cause the mode switch detection device to perform the mode switch detection method described above.
A fourth aspect of the present invention provides a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to execute the above-described mode switching detection method.
In the technical scheme provided by the invention, each load is detected based on the fault restart instruction in response to the fault restart instruction; if all the loads are in a normal running state, detecting the first four-way valve; and if the first four-way valve is not switched to the target state, controlling the first four-way valve to be switched to the target state. In the embodiment of the invention, each load is detected in response to a fault restart instruction, whether the first four-way valve is switched to the target state is detected when each load is in the normal operation state, and if the first four-way valve is not switched to the target state, the first four-way valve is controlled to be switched to the target state, so that the self-checking of mode switching is realized, and the problem that the heat pump unit is wrongly judged to have completed the switching of the four-way valve due to equipment restart is solved.
Drawings
FIG. 1 is a diagram of an embodiment of a method for detecting a mode switch according to an embodiment of the present invention;
FIG. 2 is a diagram of another embodiment of a method for detecting a mode switch according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an embodiment of controlling the first four-way valve to switch to a target state according to an embodiment of the present invention;
FIG. 4 is a schematic view of an embodiment of a cooling and heating mode according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an embodiment of a hot water mode according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an embodiment of a mode switch detection apparatus according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another embodiment of a mode switch detection apparatus according to the embodiment of the present invention;
fig. 8 is a schematic diagram of an embodiment of a detection device for mode switching in the embodiment of the present invention.
Description of reference numerals:
401-compressor, 402-gas-liquid separator, 403-second four-way valve, 404-hot water end heat exchanger, 405-first four-way valve, 406-one-way valve, 407-gas-liquid separator, 408-one-way valve component, 409-second electronic expansion valve, 410-fin heat exchanger, 411-first electronic expansion valve, 412-heating end heat exchanger, 413-three-way valve and 414-gas-liquid separator.
Detailed Description
The invention provides a mode switching detection method, a mode switching detection device and a mode switching detection storage medium, which are used for realizing self-detection of mode switching.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Moreover, the terms "comprises," "comprising," or "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
For convenience of understanding, a detailed flow of an embodiment of the present invention is described below, and referring to fig. 1, an embodiment of a method for detecting mode switching in an embodiment of the present invention includes:
101. responding to a fault restart instruction, and detecting each load based on the fault restart instruction;
it is to be understood that the executing subject of the present invention may be a mode switching detection device, and may also be a mode switching detection device, which is not limited herein. The embodiment of the present invention is described by taking a mode switching detection apparatus as an execution subject.
The heat pump unit at least comprises: the system comprises a compressor, a first four-way valve, a second four-way valve, a finned heat exchanger, a first electronic expansion valve, a second electronic expansion valve, a hot water end heat exchanger, a heating end heat exchanger, a three-way valve and other loads.
102. If all the loads are in a normal running state, detecting the first four-way valve;
when the heat pump unit is restarted, the mode switching detection device detects each load of the heat pump unit, so that whether the first four-way valve is switched to a target state or not is judged when each load is in a normal operation state.
103. And if the first four-way valve is not switched to the target state, controlling the first four-way valve to be switched to the target state.
When the first four-way valve is not switched to the target state, the mode switching detection device controls the compressor to reduce the frequency so that the high-low pressure difference of the first four-way valve meets the switching pressure difference of the first four-way valve, and therefore the first four-way valve is switched to the target state.
In the embodiment of the invention, each load is detected in response to a fault restart instruction, whether the first four-way valve is switched to the target state is detected when each load is in the normal operation state, and if the first four-way valve is not switched to the target state, the first four-way valve is controlled to be switched to the target state, so that the self-checking of mode switching is realized, and the problem that the heat pump unit is wrongly judged to have completed the switching of the four-way valve due to equipment restart is solved.
Referring to fig. 2, another embodiment of the method for detecting mode switching in the embodiment of the present invention includes:
201. responding to a fault restart instruction, and detecting each load based on the fault restart instruction;
specifically, (1) the mode switching detection device responds to a fault restart instruction, and obtains operation data and load component temperature data corresponding to each load based on the fault restart instruction; (2) And if the operation data corresponding to each load accords with the corresponding preset normal operation data and the load component temperature data corresponding to each load accords with the corresponding preset component temperature data, the mode switching detection device determines that each load is in a normal operation state.
The heat pump unit at least comprises: the system comprises a compressor, a first four-way valve, a second four-way valve, a fin heat exchanger, a first electronic expansion valve, a second electronic expansion valve, a hot water end heat exchanger, a heating end heat exchanger, a three-way valve and the like.
For example, the preset normal operation data of the compressor includes, but is not limited to: (1) The pressure value of the compressor exhaust is more than or equal to 1.1 megapascals (MPa) and less than or equal to 1.5 megapascals (MPa), and the specific pressure value can be set according to the actual application scene; (2) The compressor is operated at a current value less than or equal to the rated current value. The preset component temperature data of the compressor is as follows: the temperature value is greater than or equal to 45 degrees and less than or equal to 90 degrees, and the specific temperature value can be set according to an actual application scene. The preset normal operation data of the first four-way valve includes but is not limited to: (1) the coil is in a power-on state; and (2) operating the voltage value which is less than or equal to the rated voltage value. The preset component temperature data of the first four-way valve is as follows: the temperature value is less than or equal to 120 degrees, and the specific temperature value can be set according to the actual application scene. The preset normal operation data of the second four-way valve includes but is not limited to: (1) the coil is in a power-on state; and (2) operating the voltage value less than or equal to the rated voltage value. The preset component temperature data of the first four-way valve is as follows: the temperature value is less than or equal to 120 degrees, and the specific temperature value can be set according to the actual application scene. The preset normal operation data of the fin heat exchanger include but are not limited to: (1) the current value of the operation is less than or equal to the rated current value; and (2) operating the voltage value which is less than or equal to the rated voltage value. The preset component temperature data of the fin heat exchanger are as follows: the temperature value is greater than or equal to 30 degrees and less than or equal to 45 degrees, and the specific temperature value can be set according to the actual application scene. The preset normal operation data of the first electronic expansion valve includes, but is not limited to: (1) the coil is in a power-on state; and (2) operating the voltage value which is less than or equal to the rated voltage value. The preset component temperature data of the first electronic expansion valve are as follows: the temperature value is less than or equal to 110 degrees, and the specific temperature value can be set according to the actual application scene. The preset normal operation data of the second electronic expansion valve includes but is not limited to: (1) the coil is in a power-on state; and (2) operating the voltage value which is less than or equal to the rated voltage value. The preset component temperature data of the first electronic expansion valve are as follows: the temperature value is less than or equal to 110 degrees, and the specific temperature value can be set according to the actual application scene. The preset normal operation data of the hot-water side heat exchanger includes but is not limited to: (1) in a power-on state; and (2) the outlet water temperature is equal to the set temperature value. The preset component temperature data of the hot water end heat exchanger is as follows: the temperature value is less than or equal to 100 degrees, and the specific temperature value can be set according to the actual application scene. The preset normal operation data of the heating end heat exchanger includes but is not limited to: (1) in a power-on state; and (2) outputting the temperature equal to the set temperature value. The preset component temperature data of the heating end heat exchanger is as follows: the temperature value is less than or equal to 50 degrees, and the specific temperature value can be set according to the actual application scene. The preset normal operation data of the three-way valve includes but is not limited to: (1) in a power-on state; (2) the operating voltage value is less than or equal to the rated voltage value; and (3) operating the current value less than or equal to the rated current value. The preset part temperature data of the three-way valve is as follows: the temperature value is less than or equal to 60 degrees, and the specific temperature value can be set according to the actual application scene.
For another example, the mode switching detection device acquires the operation data of the compressor and the temperature data of the load component based on the fault restart instruction in response to the fault restart instruction, and determines that the compressor is in the normal operation state if the pressure value of the compressor discharge air is greater than or equal to 1.1 megapascal (MPa) and less than or equal to 1.5 megapascal (MPa), the current value of the operation is less than or equal to the rated current value, and the temperature value is greater than or equal to 45 degrees and less than or equal to 90 degrees.
202. If all the loads are in a normal running state, detecting the first four-way valve;
it can be understood that a first pressure value between the first four-way valve and the second four-way valve can be obtained in real time by providing a pressure sensor between the first four-way valve and the second four-way valve, and a second pressure value between the second four-way valve and the compressor can be obtained in real time by also providing a pressure sensor between the second four-way valve and the compressor.
Specifically, (1) if each load is in a normal running state, the mode switching detection device acquires a first pressure value between the first four-way valve and the second four-way valve; (2) The mode switching detection device acquires a second pressure value between the second four-way valve and the compressor; (3) The mode switching detection device calculates a first pressure difference value between a first pressure value and a second pressure value; (4) If the first pressure difference value is larger than a first threshold value, the mode switching detection device determines that the first four-way valve is not switched to the target state; (5) If the first pressure difference is less than or equal to the first threshold, the mode switching detection device determines that the first four-way valve has switched to the target state.
For example, if each load is in a normal operation state, the mode switching detection device acquires a first pressure value P1 between the first four-way valve and the second four-way valve, the mode switching detection device acquires a second pressure value P2 between the second four-way valve and the compressor, the mode switching detection device calculates a first pressure difference value between P1 and P2, if the first pressure difference value is greater than a first threshold value, the mode switching detection device determines that the first four-way valve is not switched to a target state, and if the first pressure difference value is less than or equal to the first threshold value, the mode switching detection device determines that the first four-way valve is switched to the target state.
203. If the first four-way valve is not switched to the target state, controlling the compressor to reduce the frequency, and carrying out power-on operation on the second four-way valve so as to reduce the frequency of the compressor to a target high-low pressure difference, wherein the target high-low pressure difference meets the switching condition of the first four-way valve;
the switching condition of the first four-way valve means that the high-low pressure difference is greater than or equal to the lowest switching pressure difference which can make the first four-way valve switch smoothly. The magnitude of the high-low pressure difference is in positive correlation with the operating frequency of the compressor, the higher the frequency, the larger the pressure difference is, the more the balancing time is required for balancing the high pressure and the low pressure, but the too large pressure difference will cause impact on a valve body of the first four-way valve and increase the risk of hardware damage, so that the switching of the first four-way valve needs to be realized by controlling the frequency reduction of the compressor, and the high-low pressure difference is ensured to be more than the lowest switching pressure difference recommended by the specification of the first four-way valve, for example, more than 0.3 megapascal.
For example, as shown in fig. 3, when the cooling and heating water mode is switched to the heating water mode, if the first four-way valve is not switched to the target state, the compressor is controlled to reduce the frequency to 40 hertz (Hz), or to reduce the frequency to other frequencies, which is not limited herein, and the second four-way valve is energized, and when the time period T1 ends, the first four-way valve is energized to reduce the frequency of the compressor to the target high-low pressure difference, which satisfies the switching condition of the first four-way valve. Or under the mode of heating water to switch to the mode of cooling and heating water, if the first four-way valve is not switched to the target state, the compressor is controlled to reduce the frequency to 40 hertz (Hz), or to reduce the frequency to other frequencies, where no limitation is made, the second four-way valve is powered on, and when the time duration t1 is over, the first four-way valve is powered off, so that the frequency of the compressor is reduced to the target high-low pressure difference, and the target high-low pressure difference meets the switching condition of the first four-way valve.
204. Controlling the first four-way valve to be switched to a target state based on the target high-low pressure difference meeting the switching condition of the first four-way valve;
for example, if the target high-low pressure difference is greater than or equal to the minimum switching pressure difference, the mode switching detection device controls the first four-way valve to switch to the target state, as shown in fig. 3, the first four-way valve is in the target state in the time period T2, and the first four-way valve is in the target state in the time period T2.
In fig. 3, T1= T1 and T2= T2.
205. And responding to an instruction of switching the first four-way valve to a target state, controlling the compressor to perform frequency-up operation, and performing power-off operation on the second four-way valve.
The running frequency of the compressor is recovered after the first four-way valve is switched to the target state, the switching of the four-way valve is not required to be carried out under the condition that the frequency of the compressor is slowly reduced to the minimum or the compressor is stopped, and the minimum switching pressure difference is met through the high-low pressure difference, so that the first four-way valve is switched to the target state, the normal work of the heat pump unit is ensured, the stability of the heat pump unit is improved, and the possibility of failure of the heat pump is reduced.
In a possible implementation manner, (1) if each load is in a normal operation state, the mode switching detection device acquires a third pressure value of the first four-way valve under a first preset condition; (2) The mode switching detection device acquires a fourth pressure value of the first four-way valve under a second preset condition; (3) The mode switching detection device calculates a second pressure difference value between a third pressure value and a fourth pressure value; (4) If the second pressure difference value is smaller than or equal to a second threshold value, the mode switching detection device determines that the first four-way valve is not switched to the target state; (5) If the second pressure difference is greater than the second threshold, the mode switching detection device determines that the first four-way valve has switched to the target state.
The first preset condition refers to a cooling and heating water mode or a heating water mode of the heat pump unit, it should be noted that the cooling and heating water mode refers to a cooling and heating water dual mode, i.e., cooling and heating water can be performed simultaneously, and the second preset condition refers to that the first four-way valve is switched to a target state or equipment after restarting misjudges that the first four-way valve in the heat pump unit is switched to the target state. For example, the cooling and heating water mode is switched to the heating water mode, wherein the first four-way valve is switched to a target state; or the heating water mode is switched to the cooling and heating water mode, wherein the first four-way valve is switched to a target state.
For example, as shown in fig. 4, the heat pump unit is in a cooling and heating water mode, specifically, a high-temperature and high-pressure refrigerant compressed by a compressor 401 enters a second four-way valve 403 through a gas-liquid separator 402, at this time, the second four-way valve 403 is in a power-off state, that is, a port D and a port C of the second four-way valve 403 are communicated with each other, wherein the high-temperature and high-pressure refrigerant enters from the port D of the second four-way valve 403 and then exits from the port C of the second four-way valve 403, the high-temperature and high-pressure refrigerant enters a hot water end heat exchanger 404 through the second four-way valve 403 to heat water, so as to obtain a liquid refrigerant, since the first four-way valve 405 is also in a power-off state at this time, that the port D and the port C of the first four-way valve 405 are communicated with each other, and a port E and a port S of the first four-way valve 405 are communicated with each other, since the pressure value of the E port of the first four-way valve 405 is lower than the pressure value of the C port of the first four-way valve 405, the liquid refrigerant cannot enter the C port of the first four-way valve 405 through the check valve 406, the gas-liquid separator 407, the check valve assembly 408, the second electronic expansion valve 409 and the fin heat exchanger 410, so that the liquid refrigerant can only pass through the check valve 406, the gas-liquid separator 407 and the check valve assembly 408 and is throttled by the first electronic expansion valve 411, the throttled liquid refrigerant enters the heating side heat exchanger 412 for cooling to obtain a low-temperature gaseous refrigerant, and the low-temperature gaseous refrigerant coming out of the heating side heat exchanger 412 enters from the E port of the first four-way valve 405, comes out from the S port of the first four-way valve 405, and returns to the compressor through the three-way valve 413 and the gas-liquid separator 414.
For another example, as shown in fig. 5, the heat pump unit is in a hot water heating mode, specifically, a high-temperature and high-pressure refrigerant compressed by the compressor 401 enters the second four-way valve 403 through the gas-liquid separator 402, at this time, the second four-way valve 403 is in a power-off state, that is, the port D and the port C of the second four-way valve 403 are communicated with each other, the high-temperature and high-pressure refrigerant enters the hot water side heat exchanger 404 through the second four-way valve 403 to heat water, so as to obtain a liquid refrigerant, since the first four-way valve 405 is in a power-on state, that is, the port S and the port C of the first four-way valve 405 are communicated with each other, the port E and the port D of the first four-way valve 405 are communicated with each other, since the pressure value of the port C of the first four-way valve 405 is lower than the pressure value of the port E of the first four-way valve 405, the liquid refrigerant can pass through the one-way valve 406, the gas-liquid separator 407 and the one-way valve 408 to throttle the throttled liquid refrigerant can pass through the fin 410 to perform heat exchange through the fin 410, and then enter the port C of the first four-way valve 405 to return to the gas-liquid separator 413.
For another example, if each load is in a normal operation state, the mode switching detection device obtains a third pressure value P3 of the first four-way valve under a first preset condition, the mode switching detection device obtains a fourth pressure value P4 of the first four-way valve under a second preset condition, the mode switching detection device calculates a second pressure difference value between P3 and P4, if the second pressure difference value is less than or equal to a second threshold value, the mode switching detection device determines that the first four-way valve is not switched to a target state, and if the second pressure difference value is greater than the second threshold value, the mode switching detection device determines that the first four-way valve is switched to the target state.
In a possible embodiment, (1) if each load is in a normal operation state, the mode switching detection device acquires a return air temperature value of the compressor; (2) If the return air temperature value is larger than the preset return air temperature value, the mode switching detection device determines that the first four-way valve is not switched to the target state; (3) And if the return air temperature value is less than or equal to the preset return air temperature value, the mode switching detection device determines that the first four-way valve is switched to the target state.
The return air temperature value refers to a temperature value corresponding to a low-temperature gaseous refrigerant coming out of the heating end heat exchanger.
For example, if each load is in a normal operating state, the mode switching detection device obtains the return air temperature value of the compressor: and if the preset return air temperature value is 40 ℃, the return air temperature value is greater than the preset return air temperature value, and the mode switching detection device determines that the first four-way valve is not switched to the target state. Or if each load is in a normal operation state, the mode switching detection device acquires a return air temperature value of the compressor: and if the preset return air temperature value is 40 degrees, the return air temperature value is smaller than the preset return air temperature value, and the mode switching detection device determines that the first four-way valve is switched to the target state.
In a feasible implementation mode, (1) if each load is in a normal running state, the mode switching detection device judges whether a target control signal corresponding to the first four-way valve exists or not; (2) If the target control signal exists, the mode switching detection device acquires the return air pressure value of the compressor; (3) If the return air pressure value is larger than the preset return air pressure value, the mode switching detection device determines that the first four-way valve is not switched to the target state; (4) And if the return air pressure value is less than or equal to the preset return air pressure value, the mode switching detection device determines that the first four-way valve is switched to the target state.
The return air pressure value refers to a pressure value corresponding to the low-temperature gaseous refrigerant coming out of the heating end heat exchanger.
For example, if each load is in a normal operation state, the mode switching detection device determines whether a target control signal corresponding to the first four-way valve exists, if the target control signal exists, the mode switching detection device obtains a return air pressure value of the compressor, if the return air pressure value is 0.4 mpa and the preset return air pressure value is 0.3 mpa, the return air pressure value is greater than the preset return air pressure value, and the mode switching detection device determines that the first four-way valve is not switched to the target state. Or if the return air pressure value is 0.25 MPa and the preset return air pressure value is 0.3 MPa, the return air pressure value is smaller than the preset return air pressure value, and the mode switching detection device determines that the first four-way valve is switched to the target state.
In a possible implementation manner, (1) if each load is in a normal operation state, the mode switching detection device acquires a fifth pressure value of the second four-way valve under a first preset condition; (2) The mode switching detection device acquires a sixth pressure value of the second four-way valve under a second preset condition; (3) The mode switching detection device calculates a third pressure difference value between the fifth pressure value and the sixth pressure value; (4) If the third pressure difference value is smaller than or equal to the third threshold value, the mode switching detection device determines that the first four-way valve is not switched to the target state; (5) If the third pressure difference is greater than the third threshold, the mode switching detection device determines that the first four-way valve has been switched to the target state.
For example, if each load is in a normal operation state, the mode switching detection device obtains a fifth pressure value P5 of the second four-way valve under a first preset condition, the mode switching detection device obtains a sixth pressure value P6 of the second four-way valve under a second preset condition, the mode switching detection device calculates a third pressure difference value between P5 and P6, if the third pressure difference value is less than or equal to a third threshold value, the mode switching detection device determines that the first four-way valve is not switched to a target state, and if the third pressure difference value is greater than the third threshold value, the mode switching detection device determines that the first four-way valve is switched to the target state.
In a possible implementation manner, before responding to the fault restart instruction, detecting each load based on the fault restart instruction, the method further includes: (1) The mode switching detection device responds to a mode switching instruction, and the mode switching instruction is used for instructing a heat pump unit to switch a refrigerating and heating water mode to a heating water mode; (2) The mode switching detection device carries out fault shutdown detection on the mode switching process based on the mode switching instruction; (3) If a fault shutdown state exists in the mode switching process, when the preset duration is over, the mode switching detection device controls the heat pump unit to restart, and a fault restarting instruction is generated; (4) When the heat pump unit is restarted, the mode switching detection device controls the heat pump unit to operate the refrigerating and heating water mode, and switches the refrigerating and heating water mode to the heating water mode based on the mode switching instruction.
It should be noted that the preset duration includes a valve-switching duration and a stability duration, and the preset duration may be set according to an actual application scenario, which is not limited herein, and for example, the preset duration is 40 seconds, and includes a valve-switching duration of 30 seconds and a stability duration of 10 seconds.
For another example, the mode switching detection device is responsive to a mode switching instruction for instructing the heat pump unit to switch the cooling and heating water mode to the heating water mode, the mode switching detection device performs a fault shutdown detection on the mode switching process based on the mode switching instruction, if the mode switching process has a fault shutdown state and the preset time is 40 seconds, the mode switching detection device controls the heat pump unit to restart when the 40 seconds end and generates a fault restart instruction, and when the heat pump unit restarts, the mode switching detection device controls the heat pump unit to operate the cooling and heating water mode and switches the cooling and heating water mode to the heating water mode based on the mode switching instruction.
In a possible implementation manner, before responding to the fault restart instruction, detecting each load based on the fault restart instruction, the method further includes: (1) The mode switching detection device responds to a mode switching instruction, and the mode switching instruction is used for instructing the heat pump unit to switch the heating water mode to the refrigerating and heating water mode; (2) The mode switching detection device carries out fault shutdown detection on the mode switching process based on the mode switching instruction; (3) If a fault shutdown state exists in the mode switching process, when the preset duration is over, the mode switching detection device controls the heat pump unit to restart, and a fault restarting instruction is generated; (4) When the heat pump unit is restarted, the mode switching detection device controls the heat pump unit to operate a hot water heating mode, and switches the hot water heating mode to a refrigerating and hot water heating mode based on a mode switching instruction.
For example, the mode switching detection device responds to a mode switching instruction, the mode switching instruction is used for instructing the heat pump unit to switch the heating water mode to the cooling and heating water mode, the mode switching detection device performs fault shutdown detection on the mode switching process based on the mode switching instruction, if the mode switching process has a fault shutdown state and the preset duration is 40 seconds, the mode switching detection device controls the heat pump unit to restart when the 40 seconds end and generates a fault restart instruction, and when the heat pump unit restarts, the mode switching detection device controls the heat pump unit to operate the heating water mode and switches the heating water mode to the cooling and heating water mode based on the mode switching instruction.
In the embodiment of the invention, each load is detected in response to a fault restarting instruction, whether the first four-way valve is switched to the target state or not is detected when each load is in the normal running state, and if the first four-way valve is not switched to the target state, the first four-way valve is controlled to be switched to the target state, so that the self-checking of mode switching is realized, and the problem that the switching of the four-way valve of the heat pump unit is misjudged due to equipment restarting is solved.
With reference to fig. 6, the method for detecting mode switching in the embodiment of the present invention is described above, and a device for detecting mode switching in the embodiment of the present invention is described below, where an embodiment of the device for detecting mode switching in the embodiment of the present invention includes:
the load detection module 601 is configured to respond to a fault restart instruction and detect each load based on the fault restart instruction;
a four-way valve detection module 602, configured to detect a first four-way valve if each load is in a normal operation state;
the control module 603 is configured to control the first four-way valve to switch to the target state if the first four-way valve is not switched to the target state.
In the embodiment of the invention, each load is detected in response to a fault restart instruction, whether the first four-way valve is switched to the target state is detected when each load is in the normal operation state, and if the first four-way valve is not switched to the target state, the first four-way valve is controlled to be switched to the target state, so that the self-checking of mode switching is realized, and the problem that the heat pump unit is wrongly judged to have completed the switching of the four-way valve due to equipment restart is solved.
Referring to fig. 7, another embodiment of the apparatus for detecting mode switching according to the embodiment of the present invention includes:
the load detection module 601 is configured to respond to a fault restart instruction and detect each load based on the fault restart instruction;
a four-way valve detection module 602, configured to detect a first four-way valve if each load is in a normal operation state;
the control module 603 is configured to control the first four-way valve to switch to the target state if the first four-way valve is not switched to the target state.
Optionally, the four-way valve detection module 602 is specifically configured to:
if all the loads are in a normal running state, acquiring a first pressure value between the first four-way valve and the second four-way valve;
acquiring a second pressure value between the second four-way valve and the compressor;
calculating a first pressure difference value between the first pressure value and the second pressure value;
if the first pressure difference value is larger than a first threshold value, determining that the first four-way valve is not switched to a target state;
and if the first pressure difference value is smaller than or equal to the first threshold value, determining that the first four-way valve is switched to the target state.
Optionally, the four-way valve detection module 602 is specifically configured to:
if all the loads are in a normal running state, acquiring a third pressure value of the first four-way valve under a first preset condition;
acquiring a fourth pressure value of the first four-way valve under a second preset condition;
calculating a second pressure difference value between the third pressure value and the fourth pressure value;
if the second pressure difference value is smaller than or equal to a second threshold value, it is determined that the first four-way valve is not switched to the target state;
and if the second pressure difference value is larger than a second threshold value, determining that the first four-way valve is switched to a target state.
Optionally, the four-way valve detection module 602 is specifically configured to:
if all the loads are in a normal running state, acquiring a return air temperature value of the compressor;
if the return air temperature value is larger than the preset return air temperature value, determining that the first four-way valve is not switched to a target state;
and if the return air temperature value is less than or equal to the preset return air temperature value, determining that the first four-way valve is switched to the target state.
Optionally, the four-way valve detection module 602 is specifically configured to:
if all the loads are in a normal running state, judging whether a target control signal corresponding to the first four-way valve exists or not;
if the target control signal exists, acquiring the return air pressure value of the compressor;
if the return air pressure value is larger than the preset return air pressure value, determining that the first four-way valve is not switched to a target state;
and if the return air pressure value is less than or equal to the preset return air pressure value, determining that the first four-way valve is switched to the target state.
Optionally, the mode switching detection apparatus further includes:
a response module 604, configured to respond to a mode switching instruction, where the mode switching instruction is used to instruct the heat pump unit to switch the cooling and heating water mode to the heating water mode;
a shutdown detection module 605, configured to perform, based on the mode switching instruction, fault shutdown detection on the mode switching process;
the restarting module 606 is configured to restart the heat pump unit when a preset duration is over and generate a fault restarting instruction if a fault shutdown state exists in the mode switching process;
and the operation module 607 is configured to control the heat pump unit to operate the cooling and heating water mode when the heat pump unit is restarted, and switch the cooling and heating water mode to the heating water mode based on the mode switching instruction.
Optionally, the control module 603 is specifically configured to:
if the first four-way valve is not switched to the target state, controlling the compressor to reduce the frequency, and carrying out power-on operation on the second four-way valve so that the frequency of the compressor is reduced to a target high-low pressure difference, wherein the target high-low pressure difference meets the switching condition of the first four-way valve;
controlling the first four-way valve to be switched to a target state based on the target high-low pressure difference meeting the switching condition of the first four-way valve;
and responding to an instruction of switching the first four-way valve to the target state, controlling the compressor to perform frequency-up operation, and performing power-off operation on the second four-way valve.
In the embodiment of the invention, each load is detected in response to a fault restart instruction, whether the first four-way valve is switched to the target state is detected when each load is in the normal operation state, and if the first four-way valve is not switched to the target state, the first four-way valve is controlled to be switched to the target state, so that the self-checking of mode switching is realized, and the problem that the heat pump unit is wrongly judged to have completed the switching of the four-way valve due to equipment restart is solved.
Fig. 6 and 7 describe the mode switching detection apparatus in the embodiment of the present invention in detail from the perspective of the modular functional entity, and the mode switching detection apparatus in the embodiment of the present invention is described in detail from the perspective of hardware processing.
Fig. 8 is a schematic structural diagram of a mode-switching detection apparatus 800 according to an embodiment of the present invention, where the mode-switching detection apparatus 800 may generate a relatively large difference due to different configurations or performances, and may include one or more processors (CPUs) 810 (e.g., one or more processors) and a memory 820, and one or more storage media 830 (e.g., one or more mass storage devices) storing an application 833 or data 832. Memory 820 and storage medium 830 may be, among other things, transient or persistent storage. The program stored in the storage medium 830 may include one or more modules (not shown), each of which may include a series of instruction operations in the mode switching detection apparatus 800. Further, the processor 810 may be configured to communicate with the storage medium 830 and execute a series of instruction operations in the storage medium 830 on the switched mode detection device 800.
The mode switch detection apparatus 800 may also include one or more power supplies 840, one or more wired or wireless network interfaces 850, one or more input-output interfaces 860, and/or one or more operating systems 831, such as Windows Server, mac OS X, unix, linux, freeBSD, etc. It will be appreciated by those skilled in the art that the switched mode detection device configuration shown in fig. 8 does not constitute a limitation of switched mode detection devices and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
The present invention also provides a mode switching detection device, which includes a memory and a processor, where the memory stores computer readable instructions, and the computer readable instructions, when executed by the processor, cause the processor to execute the steps of the mode switching detection method in the above embodiments.
The present invention also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium, and which may also be a volatile computer-readable storage medium, having stored therein instructions, which, when run on a computer, cause the computer to perform the steps of the method for detecting a mode switch.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various 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), a magnetic disk, or an optical disk.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A mode switching detection method is characterized by being applied to a heat pump unit, wherein the heat pump unit at least comprises a first four-way valve, a second four-way valve, a compressor and a finned heat exchanger, and the mode switching detection method comprises the following steps:
responding to a fault restarting instruction, and detecting each load based on the fault restarting instruction;
if all the loads are in a normal running state, detecting the first four-way valve;
and if the first four-way valve is not switched to the target state, controlling the first four-way valve to be switched to the target state.
2. The method as claimed in claim 1, wherein the detecting the first four-way valve if the loads are in normal operation state comprises:
if all the loads are in a normal running state, acquiring a first pressure value between the first four-way valve and the second four-way valve;
acquiring a second pressure value between the second four-way valve and the compressor;
calculating a first pressure difference between the first pressure value and the second pressure value;
if the first pressure difference value is larger than a first threshold value, determining that the first four-way valve is not switched to a target state;
and if the first pressure difference value is smaller than or equal to the first threshold value, determining that the first four-way valve is switched to the target state.
3. The method as claimed in claim 1, wherein the detecting the first four-way valve if the loads are in normal operation state comprises:
if all the loads are in a normal running state, acquiring a third pressure value of the first four-way valve under a first preset condition;
acquiring a fourth pressure value of the first four-way valve under a second preset condition;
calculating a second pressure difference value between the third pressure value and the fourth pressure value;
if the second pressure difference value is smaller than or equal to a second threshold value, determining that the first four-way valve is not switched to a target state;
and if the second pressure difference value is larger than the second threshold value, determining that the first four-way valve is switched to the target state.
4. The method as claimed in claim 1, wherein the detecting the first four-way valve if the loads are in normal operation state comprises:
if all the loads are in a normal running state, acquiring a return air temperature value of the compressor;
if the return air temperature value is larger than a preset return air temperature value, determining that the first four-way valve is not switched to a target state;
and if the return air temperature value is less than or equal to the preset return air temperature value, determining that the first four-way valve is switched to the target state.
5. The method as claimed in claim 1, wherein the detecting the first four-way valve if the loads are in normal operation state comprises:
if all the loads are in a normal running state, judging whether a target control signal corresponding to the first four-way valve exists or not;
if the target control signal exists, acquiring a return air pressure value of the compressor;
if the return air pressure value is larger than a preset return air pressure value, determining that the first four-way valve is not switched to a target state;
and if the return air pressure value is less than or equal to the preset return air pressure value, determining that the first four-way valve is switched to the target state.
6. The method according to any one of claims 1 to 5, wherein before said detecting respective loads based on the failed restart instruction in response to the failed restart instruction, further comprising:
responding to a mode switching instruction, wherein the mode switching instruction is used for instructing the heat pump unit to switch a refrigerating and heating water mode to a heating water mode;
performing fault shutdown detection on the mode switching process based on the mode switching instruction;
if a fault shutdown state exists in the mode switching process, controlling the heat pump unit to restart when the preset duration is over, and generating the fault restart instruction;
and when the heat pump unit is restarted, controlling the heat pump unit to operate the refrigerating and heating water mode, and switching the refrigerating and heating water mode to the heating water mode based on the mode switching instruction.
7. The method as claimed in claim 1, wherein the controlling the first four-way valve to switch to the target state if the first four-way valve is not switched to the target state comprises:
if the first four-way valve is not switched to the target state, controlling the compressor to perform frequency reduction, and performing power-on operation on the second four-way valve to reduce the frequency of the compressor to a target high-low pressure difference, wherein the target high-low pressure difference meets the switching condition of the first four-way valve;
controlling the first four-way valve to be switched to the target state based on the target high-low pressure difference meeting the switching condition of the first four-way valve;
and responding to an instruction of switching the first four-way valve to the target state, controlling the compressor to perform frequency-up operation, and performing power-off operation on the second four-way valve.
8. A mode switch detection device, characterized in that the mode switch detection device comprises:
the load detection module is used for responding to a fault restarting instruction and detecting each load based on the fault restarting instruction;
a four-way valve detection module for detecting the first four-way valve if each load is in a normal operation state;
and the control module is used for controlling the first four-way valve to be switched to the target state if the first four-way valve is not switched to the target state.
9. A mode switching detection device, characterized in that the mode switching detection device comprises: a memory and at least one processor, the memory having instructions stored therein;
the at least one processor invoking the instructions in the memory to cause the mode switch detection device to perform the mode switch detection method of any one of claims 1-7.
10. A computer-readable storage medium having instructions stored thereon, wherein the instructions, when executed by a processor, implement a method for detecting a mode switch according to any one of claims 1-7.
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| CN202211466384.7A CN115900146A (en) | 2022-11-22 | 2022-11-22 | Mode switching detection method, device, equipment and storage medium |
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