CN113587522B - Control method for avoiding low-temperature heating shutdown and refrigeration system - Google Patents
Control method for avoiding low-temperature heating shutdown and refrigeration system Download PDFInfo
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- CN113587522B CN113587522B CN202110846461.0A CN202110846461A CN113587522B CN 113587522 B CN113587522 B CN 113587522B CN 202110846461 A CN202110846461 A CN 202110846461A CN 113587522 B CN113587522 B CN 113587522B
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D13/00—Stationary devices, e.g. cold-rooms
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method for avoiding low-temperature heating shutdown and a refrigeration system. The control method for avoiding low-temperature heating shutdown comprises the following steps: connecting an inlet and an outlet of the indoor heat exchanger with a refrigerant pipeline through a valve capable of adjusting the flow; in the heating mode, when the compressor is started, the valve is adjusted according to the indoor temperature to control the refrigerant circulation entering the indoor heat exchanger. The invention can effectively avoid low-temperature heating shutdown, so that the refrigeration system can stably operate.
Description
Technical Field
The invention relates to the technical field related to control of a unit, in particular to a control method for avoiding shutdown of a low-temperature heating compressor of the unit.
Background
Most of cold storages in cold areas need to heat storage environments when fruits and vegetables are stored, so that the situations of blackheart, frostbite and the like of the fruits due to the fact that the storage environments are too cold are prevented; on the other hand, the fruit ripening agent is used for heating and ripening fruits and rapidly flows into the consumer market.
The technical means for heating the refrigeration house in the prior art generally comprise two types: one method is to increase an electric heating wire at the rear of a refrigerating unit in the warehouse, and realize heating in the warehouse by utilizing electric heating and fan control of the unit, and the method is simple and practical, but has large energy consumption and easily causes out-of-control warehouse temperature. The other method is heat fluorine heating, the flow direction of a refrigerant is changed by the reversing principle of a four-way reversing valve, a high-temperature and high-pressure refrigerant flows through an indoor heat exchanger, and heat is transferred to the interior of the warehouse by a fan.
However, the refrigerator uses a fan to cool the refrigerator, and the fan is usually a fixed-frequency fan and is characterized by large air quantity and long range. The problem that the compressor cannot be started due to too low high-side pressure in a heating mode of the unit under low-temperature and low-load working conditions (low outdoor environment temperature and low indoor temperature) easily occurs by utilizing the fan in cooperation with hot fluorine for heating.
Therefore, how to provide a control method for avoiding the low-temperature heating shutdown is an urgent technical problem to be solved in the industry.
Disclosure of Invention
The invention provides a control method and a refrigeration system for avoiding low-temperature heating shutdown, and aims to solve the technical problem that shutdown is easily caused by low-temperature heating in the prior art.
The control method for avoiding low-temperature heating shutdown provided by the invention comprises the following steps:
and 2, in the heating mode, when the compressor is started, the valve is adjusted according to the indoor temperature to control the refrigerant circulation entering the indoor heat exchanger.
Further, the control method further includes:
step 3, in the heating mode, after the compressor is started for a certain time, detecting the pressure of the indoor heat exchanger in a detection period;
and adjusting the valve to control the refrigerant circulation entering the indoor heat exchanger or adjusting the valve to control the refrigerant circulation entering the indoor heat exchanger and adjusting the step number of the electronic expansion valve at the outlet side of the indoor heat exchanger based on the indoor temperature and the detected pressure in a detection period according to a preset rule.
Further, the valve is a multi-way valve, the multi-way valve includes: the device comprises a main passage, at least 2 branches, a switch passage for communicating the main passage with all the branches, a slider switch which is arranged in the switch passage and can move along the switch passage so as to enable the corresponding number of the branches to be communicated with the main passage, and a driving module for driving the slider switch.
Furthermore, the multi-way valve also comprises position signal modules which are arranged on the switch channel and correspond to the branches one by one; the refrigerating system controls the driving module to adjust the slide block switch at a corresponding position according to the feedback signal of the position signal module so as to adjust the number of branches communicated with the main passage.
Further, in step 2, the indoor temperature is divided into temperature sections of the same number according to the number of branches that the main passage can communicate with, and the lower the indoor temperature is, the fewer the number of branches that the main passage can communicate with is.
Further, in the step 3, the adjusting according to the indoor temperature and the detected pressure includes a plurality of adjusting manners, and each adjusting manner includes one or more adjusting steps.
Further, in the step 3, one adjustment step of at most one adjustment mode is performed at a time according to the indoor temperature and the detected pressure, and when a judgment is performed next according to the indoor temperature and the detected pressure, if the same adjustment mode as that performed at the previous time is required, the next adjustment step of the previous adjustment step is performed next.
Further, in step 3, after an adjusting step is performed according to the indoor temperature and the detected pressure, the N cycles are kept unchanged, and corresponding adjustment is performed again according to the indoor temperature and the detected pressure in N +1 cycles.
Further, when the detected pressure is less than the preset pressure, the adjusting mode includes an executing step of increasing the number of steps of the electronic expansion valve.
Further, in the step 3, when the detected pressure is greater than or equal to the preset pressure, the adjusting manner includes an adjusting step of increasing a flow rate of the refrigerant entering the indoor heat exchanger, and/or an adjusting step of decreasing the number of steps of the electronic expansion valve.
Furthermore, the indoor heat exchanger is provided with branches which are correspondingly connected with the branches of the multi-way valve one by one.
Further, the multi-way valve is a multi-way valve with 4 branches.
The refrigeration system comprises a controller, and the controller controls the refrigeration system by adopting the control method for avoiding the low-temperature heating shutdown.
The invention adopts two multi-way valves (such as electric multi-way valves) to control the flow direction of the refrigerant, one is the refrigerant flow direction after the system is throttled during heating, the refrigerant at the outlet of the indoor heat exchanger is collected, the number of branches which can be communicated by the multi-way valves is adjusted by detecting the condensation pressure in the indoor heat exchanger during heating, and the combination control logic is matched to stabilize the condensation pressure, ensure the high-low pressure difference and avoid the shutdown caused by the over-low pressure.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
fig. 1 is a schematic diagram of a refrigeration system according to an embodiment of the present invention.
FIG. 2 is a schematic view of the multi-way valve of the present invention.
FIG. 3 is a schematic view of the connection of a multi-way valve to the inlet of an indoor heat exchanger according to an embodiment of the invention.
FIG. 4 is a schematic view of the connection of a multi-way valve to the inlet of an indoor heat exchanger according to an embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the specific structure of the refrigeration system in an embodiment of the present invention is that an exhaust port and an air suction port of a compressor 1 are both connected to a valve corresponding to a four-way valve 2 through a refrigerant pipeline, wherein the exhaust port is connected to a main passage 21 of the four-way valve, the air suction port is connected to a second branch 8033 of the four-way valve, a high-pressure switch 3 and an exhaust temperature sensing bulb 4 are arranged on the refrigerant pipeline between the exhaust port and the four-way valve, an air suction temperature sensing bulb 5, a low-pressure sensor 6 and a gas-liquid separator 7 near one side of the four-way valve are arranged on the refrigerant pipeline between the air suction port and the four-way valve 2, a first branch 8032 of the four-way valve 2 is connected to one end of an indoor heat exchanger 8, and an air suction filter 11 and an air suction stop valve 10 are arranged between the two. The other end of the indoor heat exchanger 8 is connected with one end of the outdoor heat exchanger 9, and a dry filter 12, a liquid pipe filter 13, an electronic expansion valve 14, a filter 15 and a liquid supply stop valve 16 are arranged between the indoor heat exchanger and the outdoor heat exchanger. A third branch 8034 of the four-way valve 2 is connected to the other end of the outdoor heat exchanger 9. The refrigerant line between the dry filter 12 and the liquid tube filter 13 is further provided with a refrigerant line branch connected to the suction port of the compressor 1, and the refrigerant line branch is provided with an electromagnetic valve 17, a filter 18, and a liquid ejection capillary tube 19 in this order according to the refrigerant flow direction. A defrosting thermal bulb 81 and an indoor environment thermal bulb 82 are arranged near the indoor heat exchanger (when the refrigerator is used, the thermal bulb can be called as an in-refrigerator thermal bulb, and different names can be taken according to application occasions)
The invention relates to a control method for avoiding low-temperature heating halt, which is characterized in that an inlet and an outlet of an indoor heat exchanger are connected with a refrigerant pipeline through a valve capable of adjusting the flow, then in a heating mode, when a compressor is started, the valves at the inlet and the outlet of the indoor heat exchanger are adjusted according to the indoor temperature, and the low-temperature heating halt is avoided by controlling the flow of the refrigerant entering the indoor heat exchanger.
The compressor is started for a certain time, the current room temperature and the room temperature after the operation may have a certain difference, and in order to avoid shutdown due to low-temperature heating after the compressor is started, the pressure of the indoor heat exchanger needs to be detected in a detection period after the compressor is started for a certain time, and then the refrigerant circulation entering the indoor heat exchanger is controlled by adjusting a valve of the indoor heat exchanger based on the indoor temperature and the detected pressure in the detection period according to a preset rule, or the refrigerant circulation entering the indoor heat exchanger is controlled by adjusting the valve of the indoor heat exchanger and the step number of an electronic expansion valve at the outlet side of the indoor heat exchanger is adjusted. The pressure of the indoor heat exchanger can be detected in each detection period, and can also be detected when adjustment is needed. Depending on the room temperature and the detected pressure, whether the adjustment is to take place in each detection period or in specific detection periods (i.e. including detection periods where no adjustment is to be made), the corresponding preset rules may be set as required.
In one embodiment, the valve of the present invention may be a multi-way valve 80, the multi-way valve 80 includes a main passage and at least 2 branches, and a switch passage communicating the main passage and all the branches, a slider switch movable along the switch passage is disposed in the switch passage, and positions where the slider switch stays are different, so that a corresponding number of the branches can communicate with the main passage. Such as a multi-way valve in which there are two branches, a multi-way valve in which there are three branches, a multi-way valve in which there are four branches, and a multi-way valve in which there are more branches, etc. In this embodiment, a multi-way valve with four branches is used for the inlet and the outlet of the indoor heat exchanger. The indoor heat exchanger can adopt an indoor heat exchanger with a plurality of branches, and in a preferred embodiment, the indoor heat exchanger is provided with the branches which are connected with the branches of the multi-way valve in a one-to-one correspondence mode.
As shown in fig. 2 to 4, a main passage 801 of the multi-way valve 80 with four branches 802 of the present invention is connected to a refrigerant pipeline, the four branches are connected to an indoor heat exchanger, a switch channel 806 is perpendicular to the main passage and the four branches, one end of a slider switch 807 located in the switch channel is connected to an elastic member 808 (such as a spring), the other end is one end capable of contacting with the refrigerant, a driving module 809 is disposed at the other end of the elastic member 808 in the switch channel 806, the driving module is a magnetic module in this embodiment, and the magnetic module and the slider switch are in a mutual exclusion relationship. The switch channel is also provided with position signal modules which are in one-to-one correspondence with the branches, and the unit adjusts the slider switches at corresponding positions according to feedback signals of the position signal modules so as to adjust the number of the branches communicated with the main channel. The present invention is not limited to the above connection and implementation, and for example, it is also possible to connect four branches to the refrigerant pipe and connect the main passage to the indoor heat exchanger. And the magnetic module can be arranged at one end of the elastic part, and the magnetic module and the slider switch are in repulsion or attraction relationship, so that the branch circuit can be switched on or off. The method can also be realized by replacing the magnetic module and the elastic piece by a linear motion device to realize the linear motion of the slider switch in the switch channel.
When the main passage is controlled to be communicated with the branches with the same number according to the indoor temperature, the indoor temperature is divided into temperature intervals with the same number according to the number of the branches which can be communicated with the main passage, and the lower the indoor temperature is, the fewer the branches which can be communicated with the main passage are.
In one embodiment, when four branches are used, the following control is performed as soon as the compressor is started, and the control of the valves at the inlet and outlet of the indoor heat exchanger is identical, and the indoor temperature is Tn.
Tn is less than or equal to-5 ℃, and only the branch 802 is connected;
a branch 802 and a branch 803 are opened when Tn is more than-5 ℃ and less than or equal to 5 ℃;
a branch 802, a branch 803 and a branch 804 are opened when Tn is more than 5 ℃ and less than or equal to 15 ℃;
tn > 15 deg.C, branch 802 and branch 803, branch 804 and branch 805 are opened.
In a specific embodiment, after the compressor is started for a certain period of time, when the pressure of the indoor heat exchanger is correspondingly adjusted according to the detected pressure, when the detected pressure is less than the preset pressure, the adjusting mode includes an executing step of increasing the number of steps of the electronic expansion valve, and when the detected pressure is greater than or equal to the preset pressure, the adjusting mode includes an adjusting step of increasing the flow rate of the refrigerant entering the indoor heat exchanger and/or an adjusting step of decreasing the number of steps of the electronic expansion valve. When the branch is four branches, the regulation of the connected branches and the electronic expansion valve is mainly controlled as follows, wherein the pressure of the indoor heat exchanger is P1, and the preset pressure is P0.
Adjustment mode 1: tn is less than or equal to-5 ℃, P1 is less than P0, the number of the communicated branches is kept unchanged, and the step number of the electronic expansion valve is increased, namely an adjusting step is included;
the adjusting mode 2: tn is less than or equal to-5 ℃, P1 is more than or equal to P0, and a branch 803, a branch 804 and a branch 805 are sequentially added, namely three adjusting steps are included;
adjustment mode 3: -Tn < 5 ℃ and P1 < P0 at 5 ℃ and in sequence: the branch 803 is closed, and the electronic expansion valve is adjusted to be large in steps, namely two adjusting steps are included;
the adjusting mode 4 is as follows: tn is more than 5 ℃ below zero and less than or equal to 5 ℃, P1 is more than or equal to P0, and the actions are sequentially executed: the step number of the adding branch 804, the adding branch 805 and the electronic expansion valve is adjusted to be small, namely three adjusting steps are included;
adjusting mode 5: tn is more than 5 ℃ and less than or equal to 15 ℃, P1 is more than P0, and the actions are sequentially executed: the step number of the closing branch 804, the closing branch 803 and the electronic expansion valve is increased, namely three adjusting steps are included;
adjusting mode 6: tn is more than 5 ℃ and less than or equal to 15 ℃, and P1 is more than or equal to P0, the actions are sequentially executed: adding a branch 805, and adjusting the step number of the electronic expansion valve to be small, namely comprising two adjusting steps;
the adjusting mode 7 is as follows: tn > 15 ℃, P1 < P0, the actions are performed in sequence: the closing branch 805, the closing branch 804, the branch 803 and the electronic expansion valve are adjusted in steps, namely four adjusting steps are included.
The adjusting mode 8: tn is more than 15 ℃, P1 is more than or equal to P0, the number of the communicated branches is kept unchanged, the step number of the electronic expansion valve is reduced, and the method comprises an adjusting step.
In one embodiment, the adjusting according to the indoor temperature and the detected pressure comprises the above 8 adjusting modes, and each adjusting mode comprises one or more adjusting steps. At most one adjustment step is performed at a time depending on the room temperature and the detected pressure. And after the next judgment is carried out according to the indoor temperature and the detected pressure, if the same adjusting mode is required to be executed in the previous time, the next adjusting step of the unified adjusting mode is executed in the next time. After an adjusting step is executed according to the indoor temperature and the detected pressure, the indoor temperature and the detected pressure are kept unchanged for N periods, and corresponding adjustment is carried out according to the indoor temperature and the detected pressure again in N +1 periods. For example, 4 cycles are performed and kept constant, and in the 5 th cycle, corresponding adjustments are made again based on the room temperature and the detected pressure. Therefore, frequent adjustment and influence on the stability of the system can be avoided.
Each of the above 8 control modes is an independent control, and the indoor temperature Tn in each control is a first judgment condition after the unit of the refrigeration system is started. After the unit is heated and started, firstly, the indoor temperature Tn is judged, after corresponding control is carried out, the indoor temperature Tn is judged again after the compressor is started for a certain time, after corresponding conditions are met, the pressure P1 of the indoor heat exchanger is detected, and the control which is entered is judged according to the indoor temperature and the pressure. For example, if-5 ℃ < Tn ≦ 5 ℃ and P1 < P0 in control 3 are satisfied, then the P1 value is again detected after every subsequent N cycles of execution of an action, and if P1 does not satisfy the condition, the next action of the control is executed until P1 satisfies the condition. And then maintaining the current action to not enter the condition judgment. Each control condition is not judged crossly.
The invention can be particularly applied to the refrigeration house, and provides an effective solution for solving the problem that the compressor cannot be started all the time because the low pressure is lower than the shutdown value of the compressor under the condition of low external environment temperature when the refrigeration house needs to be heated and heated during low-temperature storage, so that the low-pressure can be effectively increased under the condition of low storage temperature, and the pressure can be stably controlled under the condition that the storage temperature is not too low, thereby effectively stabilizing the storage temperature and avoiding the out-of-control storage temperature caused by too large pressure fluctuation. Of course, the invention is not limited to use in refrigerators, but may be used in other refrigeration systems. Therefore, the invention also protects the refrigerating system and comprises a controller, and the controller controls the refrigerating system by adopting the control method for avoiding low-temperature heating shutdown.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (11)
1. A control method for avoiding low-temperature heating shutdown is characterized by comprising the following steps:
step 1, connecting an inlet and an outlet of an indoor heat exchanger with a refrigerant pipeline through a valve capable of adjusting the flow;
step 2, in the heating mode, when the compressor is started, the valve is adjusted according to the indoor temperature to control the refrigerant circulation entering the indoor heat exchanger;
step 3, in the heating mode, after the compressor is started for a certain time, detecting the pressure of the indoor heat exchanger in a detection period;
adjusting the valve to control the refrigerant circulation entering the indoor heat exchanger and/or adjusting the step number of an electronic expansion valve at the outlet side of the indoor heat exchanger based on the indoor temperature and the detected pressure in a detection period according to a preset rule;
the valve is a multi-way valve, the multi-way valve includes: the device comprises a main passage and at least 2 branches, a switch passage for communicating the main passage with all the branches, a slide block switch which is arranged in the switch passage and can move along the switch passage to enable the branches with corresponding number to be communicated with the main passage, and a driving module for driving the slide block switch.
2. The control method for avoiding a low-temperature heating shutdown as claimed in claim 1, wherein the multi-way valve further comprises position signal modules disposed on the switching channel in one-to-one correspondence with the respective branches; the refrigerating system controls the driving module to adjust the slide block switch at a corresponding position according to the feedback signal of the position signal module so as to adjust the number of branches communicated with the main passage.
3. The control method for avoiding a low temperature heating shutdown as set forth in claim 1, wherein in the step 2, the indoor temperature is divided into the same number of temperature sections according to the number of branches that the main path can communicate with, and the lower the indoor temperature is, the smaller the number of branches that the main path can communicate with is.
4. The control method for avoiding a low temperature thermal shutdown as claimed in claim 1, wherein the adjustment performed according to the indoor temperature and the detected pressure in step 3 includes a plurality of adjustment modes, and each adjustment mode includes one or more adjustment steps.
5. The control method for avoiding a low temperature heating shutdown as set forth in claim 4, wherein in the step 3, one adjusting step of at most one adjusting manner is performed at a time according to the indoor temperature and the detected pressure; and after the next judgment is carried out according to the indoor temperature and the detected pressure, if the same adjusting mode is required to be carried out in the previous time, the next adjusting step of the same adjusting mode is carried out.
6. The control method for avoiding a low temperature heating shutdown as claimed in claim 4, wherein in the step 3, after performing an adjustment step based on the indoor temperature and the detected pressure, the adjustment is performed again based on the indoor temperature and the detected pressure in N +1 cycles while keeping N cycles unchanged.
7. The control method for avoiding a low temperature heating shutdown as claimed in claim 4, wherein the adjusting manner includes an execution step of increasing the number of steps of the electronic expansion valve when the detected pressure is less than a preset pressure.
8. The control method for avoiding a low temperature heating shutdown as claimed in claim 4, wherein in the step 3, when the detected pressure is equal to or higher than a preset pressure, the adjusting manner includes an adjusting step of increasing a refrigerant flow rate into the indoor heat exchanger and/or an adjusting step of decreasing the number of steps of the electronic expansion valve.
9. The control method for avoiding a low temperature heating shutdown as claimed in claim 1, wherein the indoor heat exchanger has branches connected in one-to-one correspondence with the branches of the multi-way valve.
10. The control method for avoiding a low temperature heating shutdown as claimed in claim 1, wherein the multi-way valve is a multi-way valve having 4 branches.
11. A refrigeration system comprising a controller, wherein the controller controls the refrigeration system using the control method for avoiding a low temperature heating shutdown as set forth in any one of claims 1 to 10.
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| CN110657563A (en) * | 2019-10-08 | 2020-01-07 | 珠海格力电器股份有限公司 | Control method and device for low-temperature heating unit and multi-split air conditioner |
| CN111238071A (en) * | 2020-01-07 | 2020-06-05 | 浙江中广电器股份有限公司 | Air conditioner and low-temperature heating method thereof |
| CN112344602A (en) * | 2020-09-22 | 2021-02-09 | 广东海悟科技有限公司 | Air conditioning system for improving low-temperature operation reliability and control method thereof |
| CN112484347A (en) * | 2020-11-12 | 2021-03-12 | 珠海格力电器股份有限公司 | Four-way valve reversing control method and device, air-conditioning heat pump unit and controller |
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