CN111023360B - Air source heat pump unit - Google Patents
Air source heat pump unit Download PDFInfo
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- CN111023360B CN111023360B CN201911258475.XA CN201911258475A CN111023360B CN 111023360 B CN111023360 B CN 111023360B CN 201911258475 A CN201911258475 A CN 201911258475A CN 111023360 B CN111023360 B CN 111023360B
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air source heat pump unit, comprising: an indoor unit; the outdoor unit has a volume difference with the indoor unit; the refrigerant circulating loop can enable the refrigerant to circularly flow among the compressor, the outdoor heat exchanger, the indoor heat exchanger and the four-way valve; the refrigerant bypass unloading branch is connected between the outdoor heat exchanger and the gas-liquid separator and can store redundant refrigerants in the outdoor heat exchanger into the gas-liquid separator when the volume of the outdoor unit is smaller than that of the indoor unit and the unit is used for refrigerating; or connect between indoor heat exchanger and vapour and liquid separator, it can be greater than indoor set volume and when the unit heats with unnecessary refrigerant transfer to vapour and liquid separator in the indoor heat exchanger, the controller, the configuration is: the on-off of the refrigerant bypass unloading branch can be controlled at least according to the size of the supercooling value. The invention can solve the problem of high cost of the air source heat pump unit in the prior art.
Description
Technical Field
The invention belongs to the technical field of air conditioning equipment, and particularly relates to an improvement of an air source heat pump unit structure.
Background
Air source heat pump set adopts the water module as indoor set usually, because of the water module heat exchanger adopts plate heat exchanger more, shell and tube heat exchanger, it is for finned tube heat exchanger, the heat exchanger internal volume is on the small side, make the required refrigerant circulation volume of refrigeration process and heating process different, all correspond in current structure be equipped with the high-pressure reservoir in order to save unnecessary refrigerant, but increased behind the high-pressure reservoir both increased the cost and high-pressure reservoir occupation space is big, if the design space of then all the other parts article diminishes when whole quick-witted size is fixed, the design degree of difficulty increases.
Disclosure of Invention
The invention aims to solve the problems of high cost and space occupation of the prior art that the air source heat pump unit adopts the high-pressure liquid storage device to store the refrigerant.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
an air source heat pump unit comprises:
an indoor unit;
the outdoor unit has a volume difference with the indoor unit;
the compressor is respectively connected with the indoor heat exchanger, the outdoor heat exchanger and the gas-liquid separator through the four-way valve;
the refrigerant circulating loop can enable the refrigerant to circularly flow among the compressor, the outdoor heat exchanger, the indoor heat exchanger and the four-way valve;
the refrigerant bypass unloading branch is connected between the outdoor heat exchanger and the gas-liquid separator and can transfer redundant refrigerants in the outdoor heat exchanger into the gas-liquid separator for storage when the volume of the outdoor unit is smaller than that of the indoor unit and the air source heat pump unit is used for refrigerating;
or between the indoor heat exchanger and the gas-liquid separator, when the volume of the outdoor machine is larger than that of the indoor machine and the air source heat pump unit heats, the redundant refrigerant in the indoor heat exchanger is transferred into the gas-liquid separator for storage,
a controller configured to: the on-off of the refrigerant bypass unloading branch can be controlled at least according to the magnitude of the supercooling value in the refrigerant circulation loop.
Further, the method also comprises the following steps: the pressure sensor is arranged on the air outlet side of the compressor and used for detecting the actual pressure value on the air outlet side and transmitting a signal to the controller;
the controller may be further configured to: and controlling the on-off of the refrigerant bypass unloading branch according to the relation between the actual pressure value of the air outlet side obtained by the pressure sensor and the internal preset pressure of the air outlet side and the magnitude of the supercooling value.
Further, an outdoor liquid pipe temperature sensor is arranged on the side of the liquid pipe of the outdoor heat exchanger and used for detecting the temperature value of the outdoor liquid pipe of the refrigerant running in the outdoor liquid pipe;
the controller is configured to: when the volume of the indoor unit is larger than that of the outdoor unit and the air source heat pump unit is in a refrigeration mode, the corresponding saturation temperature value can be obtained according to the actual pressure value of the air outlet side of the compressor, and the supercooling degree can be obtained according to the difference value of the saturation temperature value and the temperature value of the outdoor liquid pipe.
Further, an indoor liquid pipe temperature sensor is arranged on the liquid pipe side of the indoor heat exchanger and used for detecting the indoor liquid pipe temperature value of the refrigerant running in the indoor liquid pipe;
the controller is configured to: when the volume of the indoor unit is smaller than that of the outdoor unit and the air source heat pump unit is in a heating mode, a corresponding saturation temperature value can be obtained according to the actual pressure value of the air outlet side of the compressor, and the supercooling degree can be obtained according to the difference value of the saturation temperature value and the temperature value of the indoor liquid pipe.
Further, the method also comprises the following steps: the economizer assembly is used for refrigerant shunting and connected between the indoor heat exchanger and the outdoor heat exchanger, and one of the shunted branches of the economizer flows into the refrigerant bypass unloading branch;
the refrigerant bypass unloading branch is sequentially provided with:
the electric control valve is used for communicating with the controller so as to be switched on or off after receiving a controller signal;
the first throttling component is used for realizing the regulation control of the flow;
the air supply loop can be used for supplying air and increasing enthalpy to the compressor and is connected between the first throttling component and the compressor, and an air supply electric control valve is further arranged on the loop;
the controller is configured to transmit signals to the electric control valve or the air supply electric control valve to control the alternate on-off of the air supply loop and the refrigerant bypass unloading branch.
Furthermore, the electric control valve is a first electromagnetic valve controlled to be on and off according to the flow or a second electromagnetic valve controlled to be directly on and off by a controller, and the first throttling component is a capillary throttling pipe or an electronic expansion valve.
Further, when the volume of the outdoor unit is larger than that of the indoor unit, the difference between the actual pressure and the preset pressure on the air outlet side of the compressor is larger than a first threshold value, and the supercooling degree is smaller than a second threshold value, the controller controls the refrigerant bypass unloading branch to be opened.
Further, when the volume of the outdoor unit is larger than that of the indoor unit and the supercooling degree is smaller than a third threshold value, the controller controls the refrigerant bypass unloading branch to be opened.
Further, when the volume of the outdoor unit is larger than that of the indoor unit, and the difference between the actual pressure and the preset pressure at the air outlet side of the compressor is smaller than a fourth threshold value or the supercooling degree is smaller than a fifth threshold value, the controller controls the refrigerant bypass unloading branch to be disconnected.
Compared with the prior art, the invention has the advantages and positive effects that:
the air source heat pump unit provided by the invention is provided with a refrigerant bypass unloading branch when in arrangement, if the volume of an indoor unit of the air source heat pump unit is smaller than that of an outdoor unit, the refrigerant bypass unloading branch is connected between the indoor heat exchanger and the gas-liquid separator, and correspondingly transfers redundant refrigerants in the indoor heat exchanger into the gas-liquid separator for storage, if the volume of the indoor unit of the air source heat pump unit is larger than that of the outdoor unit, the refrigerant bypass unloading branch is connected between the outdoor heat exchanger and the gas-liquid separator, correspondingly transfers the redundant refrigerants in the outdoor heat exchanger into the gas-liquid separator for storage, correspondingly transfers the redundant refrigerants into the gas-liquid separator through the refrigerant bypass unloading branch, and correspondingly controls the branch to be switched on and switched off through a controller, controls the use according to requirements, cancels the use of a high-pressure liquid reservoir, and reduces the production cost, the occupation of the internal space of the indoor unit is reduced.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an air source heat pump unit according to the present invention;
FIG. 2 is another schematic structural diagram of an air source heat pump unit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention provides an embodiment of an air source heat pump unit, which comprises:
the indoor unit 100, the indoor unit 100 in this embodiment may be a water module or an indoor unit 100 with an outdoor heat exchanger 340,
the outdoor unit 200 has a volume difference from the indoor unit 100, and there may be 2 cases in which the volume of the outdoor unit 200 is smaller than that of the indoor unit 100, and the volume of the outdoor unit 200 is larger than that of the indoor unit 100.
A compressor 310 connected to the indoor heat exchanger 330, the outdoor heat exchanger 340, and the gas-liquid separator 350 through a four-way valve 320,
specifically, in this embodiment, the compressor 310 is connected to the four-way valve 320 through a pipeline, the four-way valve 320 is respectively connected to the outdoor heat exchanger 340, the indoor heat exchanger 330, and the gas-liquid separator 350 through pipelines, and the compressor 310 and the gas-liquid separator 350 are also connected through pipelines, so as to achieve overload protection of the compressor 310, so that redundant refrigerant in the compressor 310 can directly flow into the gas-liquid separator 350, and during refrigeration, the refrigerant flows into the compressor 310 after sequentially flowing through the outdoor heat exchanger 340, the outdoor electronic expansion valve, and the indoor heat exchanger 330 from the compressor 310.
During heating, the refrigerant flows from the compressor 310 through the indoor heat exchanger 330, the indoor electronic expansion valve, and the outdoor heat exchanger 340 in sequence, and then flows into the compressor 310.
The refrigerant bypass relief bypass 400 is mainly used to introduce the high-pressure side refrigerant into the gas-liquid separator 350.
Specifically, when the air source heat pump unit indoor unit 100 and the outdoor unit 200 are combined, the following combination method is adopted: when the volume of the outdoor unit 200 is smaller than that of the indoor unit 100, the redundant refrigerant in the outdoor heat exchanger 340 needs to be stored during refrigeration, when the air source heat pump unit is used for refrigeration, high-pressure gas of the compressor 310 can be changed into liquid through the outdoor heat exchanger 340, the refrigeration working condition is less in demand of the refrigerant, the pressure is higher in the frequency increasing process, and the surplus refrigerant is increased.
When the combination mode of the indoor unit 100 and the outdoor unit 200 of the air source heat pump unit is as follows: when the volume of the outdoor unit 200 is larger than that of the indoor unit 100, the indoor unit 100 has small volume and cannot place redundant refrigerants, redundant refrigerants in the indoor heat exchanger 330 need to be stored when heating, when the air source heat pump unit heats, high-pressure gas of the compressor 310 can be changed into liquid through the indoor heat exchanger 330, the heating working condition is low in refrigerant demand, the condensing side pressure is high in the frequency increasing process, at the moment, a refrigerant bypass unloading branch 400 can be arranged between the indoor heat exchanger 330 and the gas-liquid separator 350, the redundant refrigerants in the indoor heat exchanger 330 can be transferred into the gas-liquid separator 350 to be stored, the redundant refrigerants are stored in the gas-liquid separator 350, and the problems that the cost is high and the occupied space is large due to the fact that a high-pressure liquid accumulator is added are solved.
A controller configured to: the on-off of the refrigerant bypass unloading branch 400 can be controlled at least according to the magnitude of the supercooling value in the refrigerant circulation loop. Specifically, the present embodiment further includes: a pressure sensor 500 disposed at an outlet side of the compressor 310 for detecting an actual pressure value at the outlet side and transmitting a signal to a controller; the controller may be further configured to: the on-off of the refrigerant bypass unloading branch 400 is controlled according to the relationship between the actual pressure value of the air outlet side and the preset pressure inside the air outlet side acquired by the pressure sensor 500 and the magnitude of the supercooling value.
That is, in this embodiment, the controller may control the on/off of the refrigerant bypass unloading branch 400 according to a relation between a supercooling value or an actual pressure value at the air outlet side and a preset pressure inside the refrigerant bypass unloading branch.
Specifically, the supercooling value is a supercooling value of a liquid pipe side of the outdoor unit 200 corresponding to the entire air heat pump unit when the capacity of the outdoor unit 200 is smaller than the capacity of the indoor unit 100 and cooling, or a supercooling value of a liquid pipe side of the indoor unit 100 corresponding to the entire air heat pump unit when the capacity of the outdoor unit 200 is larger than the capacity of the indoor unit 100 and heating.
Since the operation mode of the outdoor unit 200 with a smaller volume than the indoor unit 100 is similar to the operation mode of the outdoor unit 200 with a larger volume than the indoor unit 100, for convenience of illustration, the embodiment will be described by taking the case that the volume of the outdoor unit 200 is larger than the volume of the indoor unit 100, and preferably, the indoor unit 100 in the embodiment selects a water module.
Specifically, an indoor liquid pipe temperature sensor 600 is disposed on a liquid pipe side of the indoor unit 100, and is configured to detect an indoor liquid pipe temperature value at which a refrigerant runs in the indoor liquid pipe;
the controller is configured to: the corresponding saturation temperature value can be obtained according to the actual pressure value of the air outlet side of the compressor 310 when the air source heat pump unit is in the heating mode, the saturation temperature value can be found out from corresponding related books of the refrigerant through the actual pressure value, and the supercooling degree can be obtained according to the difference value of the saturation temperature value and the temperature value of the indoor liquid pipe.
When detecting that the difference between the actual pressure and the preset pressure at the air outlet side of the compressor 310 is greater than the first threshold value, and the supercooling degree is less than the second threshold value, or the supercooling degree is less than the third threshold value, the controller controls the refrigerant bypass unloading branch 400 to be opened. When the difference between the preset pressure and the air outlet side of the compressor 310 is smaller than a fourth threshold value or the supercooling degree is smaller than a fifth threshold value, the controller controls the refrigerant bypass unloading branch 400 to be disconnected.
In this embodiment, the actual pressure at the air outlet side of the compressor 310 is Pd, the preset pressure in the controller is Pdo, the first threshold is 0.2Mpa, the second threshold is 10 ℃, the third threshold is 15 ℃, the fourth threshold is 0.1Mpa, and the fifth threshold is 7 ℃, that is, if Pd-Pdo >0.2Mpa and the supercooling degree is greater than 10 ℃; or the supercooling degree is more than 15 ℃, which indicates that the accumulation amount of the refrigerant at the condensation side is too large, and the bypass of the refrigerant is needed.
When the actual pressure and the preset pressure meet Pd-Pdo <0.1Mpa or the supercooling degree <7 ℃, controlling the refrigerant bypass unloading branch 400 to be disconnected.
Of course, the air source heat pump unit in this embodiment can also correspond to a unit that contains the tonifying qi function, and it also includes that it corresponds: the economizer assembly 700 comprises a conversion plate and an electronic expansion valve, and is used for dividing the refrigerant flowing out of the outdoor heat exchanger 340, connecting the refrigerant between the outdoor heat exchanger and the indoor heat exchanger 340, wherein one of the divided branches flows into the refrigerant bypass unloading branch 400, and the refrigerant bypass unloading branch 400 is sequentially provided with:
the electric control valve is used for communicating with the controller so as to be switched on or off after receiving a controller signal;
the first throttling component is used for realizing the regulation control of the flow;
the air supply loop can be used for supplying air and increasing enthalpy to the compressor 310 and is connected between the first throttling component and the compressor 310, and an air supply electric control valve 800 is further arranged on the loop;
the controller is configured to transmit a signal to the electronic control valve or the air supply electronic control valve 800 to control the alternate on/off of the air supply circuit and the refrigerant bypass unloading branch 400.
When the air source heat pump unit heats, the refrigerant flowing out of the indoor heat exchanger 330 enters the economizer assembly 700, then is split by the economizer assembly 700, a part of the refrigerant enters the outdoor heat exchanger 340, a part of the refrigerant enters the first throttling part, after passing through the first throttling part, when the redundant refrigerant needs to be stored, the controller can correspondingly control the electric control valve to be opened, the air supplementing electric control valve 800 is closed, at the moment, the refrigerant bypass unloading branch 400 is conducted, and the refrigerant can enter the gas-liquid separator 350 through the electric control valve, so that the redundant refrigerant is stored; when air supplement is needed, the controller controls the electric control valve to be closed, the air supplement electric control valve 800 is opened, and the refrigerant enters the compressor 310 through the air supplement electric control valve 800 to realize the air supplement function of the compressor 310.
Meanwhile, the flow regulation and control of the refrigerant bypass unloading branch 400 or the air supplement branch can be correspondingly realized through the arranged first throttling component.
The electric control valve in this embodiment may be a first electromagnetic valve 910 that is controlled to be turned on or turned off according to the flow rate or a second electromagnetic valve 930 that is controlled to be directly turned on or turned off by a controller, and the first throttling component is a capillary throttling pipe 920 or an electronic expansion valve 940. That is, the first solenoid valve 910 and the capillary flow tube 920 may be correspondingly disposed on the refrigerant bypass unloading branch, the first solenoid valve 910 may be combined with the electronic expansion valve 940, or the second solenoid valve 930 may be combined with the capillary flow tube 920 or the electronic expansion valve 940, which is not limited herein.
In this embodiment, the electric control valve on the refrigerant bypass unloading branch 400 can be controlled independently by the controller, and is irrelevant to the control of the indoor electronic expansion valve and the outdoor electronic expansion valve, so that the control stability is high; the bypass speed is high, and the bypass amount is easy to control.
Meanwhile, the bypass flow rate can be controlled according to the opening degree of the capillary throttle pipe 930 or the electronic expansion valve 940, so that the phenomenon that the operating frequency is reduced due to overhigh pressure is prevented, and the control speed is high.
If the volume of the outdoor unit 200 is smaller than that of the indoor unit, detecting the temperature value of an outdoor liquid pipe of the refrigerant running in the outdoor liquid pipe through an outdoor liquid pipe temperature sensor on the liquid pipe side of the outdoor heat exchanger 340 correspondingly; and the controller obtains a corresponding saturation temperature value according to the actual pressure value of the air outlet side of the compressor 310 when the air source heat pump unit is in a refrigeration mode, and obtains the supercooling degree according to the difference value between the saturation temperature value and the temperature value of the outdoor liquid pipe.
The on-off of the refrigerant bypass unloading branch 400 corresponding to the controller is controlled according to the actual pressure and the preset pressure relationship and the supercooling value at the air outlet side of the compressor 310, the process is the same as the above-mentioned method, and details are not described herein, of course, when the volume of the outdoor unit 200 is smaller than that of the indoor unit, the outdoor unit may be a unit having an air supply function, the setting method and principle are the same as those when the volume of the outdoor unit 200 is larger than that of the indoor unit, and details are not described herein.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. An air source heat pump unit comprises:
an indoor unit;
the outdoor unit has a volume difference with the indoor unit;
the compressor is respectively connected with the indoor heat exchanger, the outdoor heat exchanger and the gas-liquid separator through the four-way valve;
the refrigerant circulating loop can enable the refrigerant to circularly flow among the compressor, the outdoor heat exchanger, the indoor heat exchanger and the four-way valve;
it is characterized by also comprising:
the refrigerant bypass unloading branch is connected between the outdoor heat exchanger and the gas-liquid separator and can transfer redundant refrigerants in the outdoor heat exchanger into the gas-liquid separator for storage when the volume of the outdoor unit is smaller than that of the indoor unit and the air source heat pump unit is used for refrigerating;
or between the indoor heat exchanger and the gas-liquid separator, when the volume of the outdoor machine is larger than that of the indoor machine and the air source heat pump unit heats, the redundant refrigerant in the indoor heat exchanger is transferred into the gas-liquid separator for storage,
a controller configured to: the on-off of the refrigerant bypass unloading branch can be controlled at least according to the magnitude of the supercooling value in the refrigerant circulation loop.
2. The air source heat pump unit of claim 1, further comprising:
the pressure sensor is arranged on the air outlet side of the compressor and used for detecting the actual pressure value on the air outlet side and transmitting a signal to the controller;
the controller may be further configured to: and controlling the on-off of the refrigerant bypass unloading branch according to the relation between the actual pressure value of the air outlet side obtained by the pressure sensor and the internal preset pressure of the air outlet side and the magnitude of the supercooling value.
3. The air source heat pump unit of claim 2,
the outdoor liquid pipe temperature sensor is arranged on the liquid pipe side of the outdoor heat exchanger and is used for detecting the temperature value of the outdoor liquid pipe of the refrigerant running in the outdoor liquid pipe;
the controller is configured to: when the volume of the indoor unit is larger than that of the outdoor unit and the air source heat pump unit is in a refrigeration mode, the corresponding saturation temperature value can be obtained according to the actual pressure value of the air outlet side of the compressor, and the supercooling degree can be obtained according to the difference value of the saturation temperature value and the temperature value of the outdoor liquid pipe.
4. The air source heat pump unit of claim 2,
the indoor liquid pipe temperature sensor is arranged on the liquid pipe side of the indoor heat exchanger and used for detecting the indoor liquid pipe temperature value of the refrigerant running in the indoor liquid pipe;
the controller is configured to: when the volume of the indoor unit is smaller than that of the outdoor unit and the air source heat pump unit is in a heating mode, a corresponding saturation temperature value can be obtained according to the actual pressure value of the air outlet side of the compressor, and the supercooling degree can be obtained according to the difference value of the saturation temperature value and the temperature value of the indoor liquid pipe.
5. The air source heat pump unit of claim 3 or 4, further comprising:
the economizer assembly is used for refrigerant shunting and connected between the indoor heat exchanger and the outdoor heat exchanger, and one of the shunted branches flows into the refrigerant bypass unloading branch;
the refrigerant bypass unloading branch is sequentially provided with:
the electric control valve is used for communicating with the controller so as to be switched on or off after receiving a controller signal;
the first throttling component is used for realizing the regulation control of the flow;
the air supply loop can be used for supplying air and increasing enthalpy to the compressor and is connected between the first throttling component and the compressor, and an air supply electric control valve is further arranged on the loop;
the controller is configured to transmit signals to the electric control valve or the air supply electric control valve to control the alternate on-off of the air supply loop and the refrigerant bypass unloading branch.
6. The air source heat pump unit according to claim 5, wherein the electric control valve is a first solenoid valve controlled to be on-off according to the flow rate or a second solenoid valve controlled to be directly on-off by a controller, and the first throttling component is a capillary throttling pipe or an electronic expansion valve.
7. The air source heat pump unit of claim 1, wherein the controller controls the refrigerant bypass unloading branch to be opened when the volume of the outdoor unit is larger than the volume of the indoor unit, the difference between the actual pressure and the preset pressure at the air outlet side of the compressor is larger than a first threshold, and the supercooling degree is smaller than a second threshold.
8. The air source heat pump unit of claim 1, wherein the controller controls the refrigerant bypass unloading branch to be opened when the outdoor unit volume is larger than the indoor unit volume and the supercooling degree is smaller than a third threshold value.
9. The air source heat pump unit of claim 1, wherein the controller controls the refrigerant bypass unloading branch to be disconnected when the volume of the outdoor unit is larger than that of the indoor unit and the difference between the actual pressure and the preset pressure on the air outlet side of the compressor is smaller than a fourth threshold or the supercooling degree is smaller than a fifth threshold.
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| CN201911258475.XA CN111023360B (en) | 2019-12-10 | 2019-12-10 | Air source heat pump unit |
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| CN201911258475.XA CN111023360B (en) | 2019-12-10 | 2019-12-10 | Air source heat pump unit |
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| CN111023360A CN111023360A (en) | 2020-04-17 |
| CN111023360B true CN111023360B (en) | 2021-07-30 |
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| CN113218035B (en) * | 2021-05-14 | 2022-04-22 | 宁波奥克斯电气股份有限公司 | Control method for multi-split oil return noise reduction, storage medium and multi-split air conditioner |
| CN115993016A (en) * | 2022-12-02 | 2023-04-21 | 珠海格力电器股份有限公司 | Air conditioning system, air conditioning unit and control method |
| CN117199631B (en) * | 2023-09-21 | 2024-08-16 | 无锡启乐智能装备有限公司 | Direct-cooling and direct-heating type battery pack temperature control test system with wide adjusting range |
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| JP4566845B2 (en) * | 2005-07-08 | 2010-10-20 | 三菱電機株式会社 | Air conditioner |
| CN106051984A (en) * | 2016-07-15 | 2016-10-26 | 珠海格力电器股份有限公司 | Air conditioning system with liquid bypass device |
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| CN111023360A (en) | 2020-04-17 |
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