CN112432342A - Differential pressure control system and method of heat pump air conditioner and heat pump air conditioner - Google Patents
Differential pressure control system and method of heat pump air conditioner and heat pump air conditioner Download PDFInfo
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- CN112432342A CN112432342A CN202011322565.3A CN202011322565A CN112432342A CN 112432342 A CN112432342 A CN 112432342A CN 202011322565 A CN202011322565 A CN 202011322565A CN 112432342 A CN112432342 A CN 112432342A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1932—Oil pressures
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a differential pressure control system and method of a heat pump air conditioner and the heat pump air conditioner, wherein the system adjusts the operation frequency of a compressor and the opening degree of an electronic expansion valve after determining that the system enters a differential pressure over-low oil return control mode so as to improve the differential pressure of the system, ensure the operation reliability of the compressor, ensure the use comfort of a user and improve the reliability of the start and operation of the system; compared with the prior art that the system pressure difference is improved by simply adjusting the opening of the electronic expansion valve to realize the circulating supply of the refrigeration oil, the technical scheme provided by the invention has the advantages that the control mode is more accurate, and the problem of low-pressure protection is not easy to occur; compared with the prior art that the external force is provided by adding the oil pump to realize the normal supply of the oil, the technical scheme provided by the invention can reduce the cost and has higher reliability.
Description
Technical Field
The invention relates to the technical field of intelligent control of air conditioners, in particular to a differential pressure control system and method of a heat pump air conditioner and the heat pump air conditioner.
Background
At present, in the field of air-cooled screw heat pump units, a screw compressor needs to supply refrigeration oil circularly by means of pressure difference, and if the pressure difference is insufficient, the oil return process of the compressor is influenced, so that the normal operation of the compressor is influenced, and even the compressor is damaged. In the prior art, a common method for solving the problem is to add an oil pump, and provide external force through the oil pump to realize normal supply of oil. But this approach is limited by the reliability of the oil pump and results in increased costs.
The related technology discloses a pressure difference control method of a refrigerating unit and the refrigerating unit, wherein the pressure difference is improved by increasing the opening degree of an electronic expansion valve, the mode is rough, the sequential and gradual adjustment of the air suction amount of a compressor is not combined, and low-pressure protection is easy to occur.
The related technology discloses a method, a device and a unit for adjusting system pressure difference, which adjust condensation pressure by adjusting air quantity on an air side and improve pressure difference by reducing heat exchange area on the air side and improving high pressure. The scheme is only limited to a year-round refrigerating unit, and can be only used under the refrigerating working condition, so that the air-cooled screw type heat pump unit has low pressure difference during heating.
Disclosure of Invention
In view of the above, the present invention provides a pressure difference control system and method for a heat pump air conditioner, and a heat pump air conditioner, so as to solve the problems that in the prior art, the heat pump air conditioner only adjusts the opening degree of an electronic expansion valve to increase the system pressure difference to realize the refrigeration oil circulation supply, the control mode is not accurate enough, and low-pressure protection is easy to occur.
According to a first aspect of embodiments of the present invention, there is provided a pressure difference control system of a heat pump air conditioner, including:
the system comprises a compressor, a heat exchanger and a controller;
the compressor is connected with the heat exchanger through a four-way reversing valve;
the heat exchanger is connected with the controller through an electronic expansion valve;
the controller is connected with the compressor through a variable frequency control box;
and the controller is used for determining whether the system enters a pressure difference over-low oil return control mode or not, and adjusting the running frequency of the compressor and the opening degree of the electronic expansion valve after determining that the system enters the pressure difference over-low oil return control mode so as to improve the pressure difference of the system.
Preferably, the heat exchanger comprises:
parallel fin heat exchangers, and, shell and tube heat exchangers;
one end of the heat exchanger after parallel connection is connected with the four-way reversing valve, and the other end of the heat exchanger is connected with the electronic expansion valve.
Preferably, the system further comprises:
the high-pressure sensor is arranged on an input loop connected with the compressor and the heat exchanger and used for detecting the high-pressure value of the system;
the low-pressure sensor is arranged on an output loop connected with the compressor and the heat exchanger and used for detecting the low-pressure value of the system;
and the controller is specifically used for determining whether the system enters a pressure difference too low oil return control mode or not according to the high-pressure value and the low-pressure value.
According to a second aspect of the embodiments of the present invention, there is provided a pressure difference control method of a heat pump air conditioner, including:
determining whether the system enters a differential pressure over-low oil return control mode;
after the system is determined to enter the pressure difference over-low oil return control mode, the operation frequency of the compressor and the opening degree of the electronic expansion valve are adjusted to improve the pressure difference of the system.
Preferably, the method further comprises:
acquiring a high-pressure value of the system and a low-pressure value of the system;
whether the system enters a differential pressure over-low oil return control mode is determined, and the method specifically comprises the following steps:
and determining whether the system enters a differential pressure over-low oil return control mode or not according to the high-pressure value and the low-pressure value.
Preferably, according to the high pressure value and the low pressure value, it is determined whether the system enters a differential pressure excessively low oil return control mode, specifically:
if the low-pressure value is larger than the low-pressure target value; and the number of the first and second electrodes,
the difference value between the high-pressure value and the low-pressure value is smaller than a target pressure difference; and the number of the first and second electrodes,
the initial frequency maintaining time of the compressor is more than or equal to the preset frequency maintaining time; and the number of the first and second electrodes,
the initial step number maintaining time of the electronic expansion valve is more than or equal to the preset step number maintaining time;
and determining that the system enters a pressure difference low oil return control mode.
Preferably, the initial number of steps of the electronic expansion valve is:
the number of action steps of the electronic expansion valve in the refrigeration mode; alternatively, the first and second electrodes may be,
the number of operation steps of the electronic expansion valve in the heating mode.
Preferably, the adjusting the operating frequency of the compressor and the opening degree of the electronic expansion valve specifically include:
adjusting the running frequency of the compressor once every other first preset time length; and a process for the preparation of a coating,
and the action steps of the electronic expansion valve are increased once every second preset time.
Preferably, the method further comprises:
if the low-pressure value is less than or equal to the low-pressure target value; alternatively, the first and second electrodes may be,
the difference value between the high-pressure value and the low-pressure value is greater than or equal to a target pressure difference;
the control system exits the differential pressure under-low oil return control mode.
According to a second aspect of embodiments of the present invention, there is provided a heat pump air conditioner including:
the pressure difference control system of the heat pump air conditioner is provided.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
after the system is determined to enter the pressure difference over-low oil return control mode, the operation frequency of the compressor and the opening degree of the electronic expansion valve are adjusted, so that the system pressure difference is improved, the operation reliability of the compressor is ensured, the use comfort of a user is ensured, and the starting and operation reliability of the system is improved; compared with the prior art that the system pressure difference is improved by simply adjusting the opening of the electronic expansion valve to realize the circulating supply of the refrigeration oil, the technical scheme provided by the invention has the advantages that the control mode is more accurate, and the problem of low-pressure protection is not easy to occur; compared with the prior art that the external force is provided by adding the oil pump to realize the normal supply of the oil, the technical scheme provided by the invention can reduce the cost and has higher reliability.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a pressure differential control system for a heat pump air conditioner according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating a method of differential pressure control for a heat pump air conditioner according to an exemplary embodiment;
FIG. 3 is a flow chart illustrating a heat pump air conditioner entering a pressure differential under low oil return control mode according to an exemplary embodiment;
FIG. 4 is a flow chart illustrating a heat pump air conditioner exiting a differential pressure too low oil return control mode according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 1 is a schematic diagram illustrating a differential pressure control system of a heat pump air conditioner according to an exemplary embodiment, as shown in fig. 1, the system including:
the compressor 1, the heat exchanger and the controller 6;
the compressor 1 is connected with the heat exchanger through a four-way reversing valve 2;
the heat exchanger is connected with the controller 6 through an electronic expansion valve 4;
the controller 6 is connected with the compressor 1 through a variable frequency control box 7;
and the controller 6 is used for determining whether the system enters a pressure difference over-low oil return control mode or not, and adjusting the running frequency of the compressor and the opening degree of the electronic expansion valve after determining that the system enters the pressure difference over-low oil return control mode so as to improve the pressure difference of the system.
It should be noted that the technical solution provided in this embodiment is applicable to a heat pump air conditioner, and is particularly applicable to a variable frequency air-cooled screw type heat pump air conditioner.
The controller is one of the following items, or the combination of a plurality of items, and comprises the following items:
single chip computer, PLC controller, DSP processor, PFGA controller, etc.
It can be understood that the controller sends a frequency modulation command to control the variable frequency control box to adjust the operating frequency of the compressor, improve the operating frequency of the compressor and improve the rotating speed; meanwhile, the opening degree of the electronic expansion valve needs to be properly increased after the rotating speed is increased, and the minimum limit value of low pressure needs to be considered, so that low-pressure protection caused by excessive refrigerant suction is prevented.
It can be understood that, according to the technical scheme provided by this embodiment, after it is determined that the system enters the differential pressure too-low oil return control mode, the operating frequency of the compressor and the opening degree of the electronic expansion valve are adjusted, so as to improve the differential pressure of the system, ensure the operating reliability of the compressor, ensure the use comfort of a user, and improve the reliability of the starting and the operation of the system; compared with the prior art that the refrigeration oil circulation supply is realized by only adjusting the opening of the electronic expansion valve to improve the system pressure difference, the technical scheme provided by the embodiment has more accurate control mode and is not easy to cause the problem of low-pressure protection; compare among the prior art and provide external force through increasing the oil pump and realize the normal supply of oil, the technical scheme that this embodiment provided can reduce cost, the reliability is higher.
Preferably, the heat exchanger comprises:
the parallel fin heat exchanger 3 and the shell-and-tube heat exchanger 5;
one end of the heat exchanger after parallel connection is connected with the four-way reversing valve 2, and the other end of the heat exchanger is connected with the electronic expansion valve 4.
Referring to fig. 1, a differential pressure control system of a heat pump air conditioner shown in fig. 1, wherein,
the refrigerant refrigeration flow direction is as follows:
the system comprises a compressor 1, a four-way reversing valve 2, a finned heat exchanger 3, an electronic expansion valve 4, a shell and tube heat exchanger 5 and the compressor 1;
the refrigerant heating flow direction is as follows:
the compressor comprises a compressor 1, a four-way reversing valve 2, a shell-and-tube heat exchanger 5, an electronic expansion valve 4, a fin heat exchanger 3 and the compressor 1.
Preferably, the system further comprises:
the high-pressure sensor Ph is arranged on an input loop of the compressor 1 connected with the heat exchanger and used for detecting the high-pressure value of the system;
the low-pressure sensor Pd is arranged on an output loop of the compressor 1 connected with the heat exchanger and is used for detecting the low-pressure value of the system;
and the controller is specifically used for determining whether the system enters a pressure difference too low oil return control mode or not according to the high-pressure value and the low-pressure value.
It can be understood that, the technical scheme that this embodiment provided, through detecting low pressure value, high pressure value, adjust the operating frequency of compressor and the aperture of system electronic expansion valve, improve system's pressure differential, guaranteed compressor operational reliability, guaranteed user's comfort level.
Fig. 2 is a flowchart illustrating a pressure difference control method of a heat pump air conditioner according to an exemplary embodiment, as shown in fig. 2, the method including:
step S11, determining whether the system enters a differential pressure over-low oil return control mode;
and step S12, after the system is determined to enter the pressure difference over-low oil return control mode, adjusting the running frequency of the compressor and the opening degree of the electronic expansion valve to improve the pressure difference of the system.
It should be noted that the technical solution provided in this embodiment is applicable to a heat pump air conditioner, and is particularly applicable to a variable frequency air-cooled screw type heat pump air conditioner.
The controller of the variable-frequency air-cooled screw type heat pump air conditioner sends a frequency modulation command to control the variable-frequency control box to adjust the operating frequency of the compressor, improve the operating frequency of the compressor and improve the rotating speed; meanwhile, the opening degree of the electronic expansion valve needs to be properly increased after the rotating speed is increased, and the minimum limit value of low pressure needs to be considered, so that low-pressure protection caused by excessive refrigerant suction is prevented.
It can be understood that, according to the technical scheme provided by this embodiment, after it is determined that the system enters the differential pressure too-low oil return control mode, the operating frequency of the compressor and the opening degree of the electronic expansion valve are adjusted, so as to improve the differential pressure of the system, ensure the operating reliability of the compressor, ensure the use comfort of a user, and improve the reliability of the starting and the operation of the system; compared with the prior art that the refrigeration oil circulation supply is realized by only adjusting the opening of the electronic expansion valve to improve the system pressure difference, the technical scheme provided by the embodiment has more accurate control mode and is not easy to cause the problem of low-pressure protection; compare among the prior art and provide external force through increasing the oil pump and realize the normal supply of oil, the technical scheme that this embodiment provided can reduce cost, the reliability is higher.
Preferably, the method further comprises:
acquiring a high-pressure value of the system and a low-pressure value of the system;
whether the system enters a differential pressure over-low oil return control mode is determined, and the method specifically comprises the following steps:
and determining whether the system enters a differential pressure over-low oil return control mode or not according to the high-pressure value and the low-pressure value.
It can be understood that, the technical scheme that this embodiment provided, through detecting low pressure value, high pressure value, adjust the operating frequency of compressor and the aperture of system electronic expansion valve, improve system's pressure differential, guaranteed compressor operational reliability, guaranteed user's comfort level.
Referring to fig. 3, preferably, it is determined whether the system enters the differential pressure too low oil return control mode according to the high pressure value and the low pressure value, specifically:
if the low-pressure value is larger than the low-pressure target value; and the number of the first and second electrodes,
the difference value between the high-pressure value and the low-pressure value is smaller than a target pressure difference; and the number of the first and second electrodes,
the initial frequency maintaining time of the compressor is more than or equal to the preset frequency maintaining time; and the number of the first and second electrodes,
the initial step number maintaining time of the electronic expansion valve is more than or equal to the preset step number maintaining time;
and determining that the system enters a pressure difference low oil return control mode.
It should be noted that the low-pressure target value, the target pressure difference, the preset frequency maintaining time, and the preset step number maintaining time are set according to historical experience values, or are set according to experimental data.
Preferably, the initial number of steps of the electronic expansion valve is:
the number of action steps of the electronic expansion valve in the refrigeration mode; alternatively, the first and second electrodes may be,
the number of operation steps of the electronic expansion valve in the heating mode.
It can be understood that, if the heat pump air conditioner is in the refrigeration mode, the system is determined to enter the pressure difference over-low oil return control mode, and the reference is the number of the action steps of the electronic expansion valve in the refrigeration mode; if the heat pump air conditioner is in the heating mode, the system is determined to enter the oil return control mode with the low differential pressure, and the reference is the action steps of the electronic expansion valve in the heating mode.
It can be understood that, in the prior art, the method for adjusting the system pressure difference is to adjust the condensation pressure by adjusting the air quantity on the air side, and to increase the pressure difference by reducing the heat exchange area on the air side to increase the high pressure. The scheme is only limited to a year-round refrigerating unit, and can only be used under the refrigerating working condition, so that the air-cooled screw type heat pump unit has the condition of lower pressure difference during heating, and the prior art cannot solve the problem. The technical scheme provided by the embodiment is not only suitable for adjusting the system pressure difference when the air conditioner is in the refrigeration mode, but also suitable for adjusting the system pressure difference when the air conditioner is in the heating mode, and has wide application scenes and strong applicability.
Preferably, the adjusting the operating frequency of the compressor and the opening degree of the electronic expansion valve specifically include:
adjusting the running frequency of the compressor once every other first preset time length; and a process for the preparation of a coating,
and the action steps of the electronic expansion valve are increased once every second preset time.
It should be noted that the first preset duration and the second preset duration are set according to user needs, and the first preset duration and the second preset duration may be equal to each other or unequal to each other.
Referring to fig. 4, preferably, the method further includes:
if the low-pressure value is less than or equal to the low-pressure target value; alternatively, the first and second electrodes may be,
the difference value between the high-pressure value and the low-pressure value is greater than or equal to a target pressure difference;
the control system exits the differential pressure under-low oil return control mode.
A heat pump air conditioner is shown according to an exemplary embodiment, including:
the pressure difference control system of the heat pump air conditioner is provided.
It can be understood that, according to the technical scheme provided by this embodiment, after it is determined that the system enters the differential pressure too-low oil return control mode, the operating frequency of the compressor and the opening degree of the electronic expansion valve are adjusted, so as to improve the differential pressure of the system, ensure the operating reliability of the compressor, ensure the use comfort of a user, and improve the reliability of the starting and the operation of the system; compared with the prior art that the refrigeration oil circulation supply is realized by only adjusting the opening of the electronic expansion valve to improve the system pressure difference, the technical scheme provided by the embodiment has more accurate control mode and is not easy to cause the problem of low-pressure protection; compare among the prior art and provide external force through increasing the oil pump and realize the normal supply of oil, the technical scheme that this embodiment provided can reduce cost, the reliability is higher.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A pressure differential control system of a heat pump air conditioner, comprising:
the system comprises a compressor, a heat exchanger and a controller;
the compressor is connected with the heat exchanger through a four-way reversing valve;
the heat exchanger is connected with the controller through an electronic expansion valve;
the controller is connected with the compressor through a variable frequency control box;
and the controller is used for determining whether the system enters a pressure difference over-low oil return control mode or not, and adjusting the running frequency of the compressor and the opening degree of the electronic expansion valve after determining that the system enters the pressure difference over-low oil return control mode so as to improve the pressure difference of the system.
2. The system of claim 1, wherein the heat exchanger comprises:
parallel fin heat exchangers, and, shell and tube heat exchangers;
one end of the heat exchanger after parallel connection is connected with the four-way reversing valve, and the other end of the heat exchanger is connected with the electronic expansion valve.
3. The system of claim 2, further comprising:
the high-pressure sensor is arranged on an input loop connected with the compressor and the heat exchanger and used for detecting the high-pressure value of the system;
the low-pressure sensor is arranged on an output loop connected with the compressor and the heat exchanger and used for detecting the low-pressure value of the system;
and the controller is specifically used for determining whether the system enters a pressure difference too low oil return control mode or not according to the high-pressure value and the low-pressure value.
4. A pressure difference control method of a heat pump air conditioner is characterized by comprising the following steps:
determining whether the system enters a differential pressure over-low oil return control mode;
after the system is determined to enter the pressure difference over-low oil return control mode, the operation frequency of the compressor and the opening degree of the electronic expansion valve are adjusted to improve the pressure difference of the system.
5. The method of claim 4, further comprising:
acquiring a high-pressure value of the system and a low-pressure value of the system;
whether the system enters a differential pressure over-low oil return control mode is determined, and the method specifically comprises the following steps:
and determining whether the system enters a differential pressure over-low oil return control mode or not according to the high-pressure value and the low-pressure value.
6. The method according to claim 5, wherein whether the system enters the pressure difference low oil return control mode is determined according to the high pressure value and the low pressure value, and specifically:
if the low-pressure value is larger than the low-pressure target value; and the number of the first and second electrodes,
the difference value between the high-pressure value and the low-pressure value is smaller than a target pressure difference; and the number of the first and second electrodes,
the initial frequency maintaining time of the compressor is more than or equal to the preset frequency maintaining time; and the number of the first and second electrodes,
the initial step number maintaining time of the electronic expansion valve is more than or equal to the preset step number maintaining time;
and determining that the system enters a pressure difference low oil return control mode.
7. The method of claim 6,
the initial steps of the electronic expansion valve are as follows:
the number of action steps of the electronic expansion valve in the refrigeration mode; alternatively, the first and second electrodes may be,
the number of operation steps of the electronic expansion valve in the heating mode.
8. The method of claim 6, wherein the adjusting the operating frequency of the compressor and the opening degree of the electronic expansion valve comprises:
adjusting the running frequency of the compressor once every other first preset time length; and a process for the preparation of a coating,
and the action steps of the electronic expansion valve are increased once every second preset time.
9. The method of claim 6, further comprising:
if the low-pressure value is less than or equal to the low-pressure target value; alternatively, the first and second electrodes may be,
the difference value between the high-pressure value and the low-pressure value is greater than or equal to a target pressure difference;
the control system exits the differential pressure under-low oil return control mode.
10. A heat pump air conditioner, comprising:
a differential pressure control system of a heat pump air conditioner as claimed in any one of claims 1 to 3.
Priority Applications (1)
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Cited By (1)
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| CN115355640A (en) * | 2022-08-26 | 2022-11-18 | 青岛海尔中央空调有限公司 | Method and device for controlling water chilling unit, water chilling unit and storage medium |
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