A method for improving freezing start-up of a heat pump unit, a heat pump unit and a computer device

Abstract

The present invention relates to the technical field of heat pump units, and more specifically, to a method for improving freezing startup of heat pump units, comprising the following steps: S1: using a first temperature sensor to collect ambient temperature Ta, a second temperature sensor to collect the oil temperature Tb at the bottom of the compressor, and transmitting the collected ambient temperature Ta and the oil temperature Tb at the bottom of the compressor to a controller; S2: judging Ta, if Ta>0, the crankshaft heating belt and the gas-liquid separation heating belt are not turned on; if 0≥Ta>-20°C, the crankshaft heating belt and the gas-liquid separation heating belt are turned on and the oil temperature superheat ΔT=Ta-Tb is updated in real time, when ΔT≥3°C, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to be turned off; if -20°C≥Ta, the crankshaft heating belt and the gas-liquid separation heating belt are turned on and the oil temperature superheat ΔT=Ta-Tb is updated in real time, when ΔT>10°C, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to be turned off. The present invention can optimize the problems of startup failure, low pressure too low, and air suction liquid return in the startup state of the heat pump unit.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump units, and more specifically, to a method for improving freezing startup of a heat pump unit, a heat pump unit and computer equipment. Background Art

[0002] During the startup of a traditional heat pump air conditioner at a low ambient temperature, due to long-term freezing, the refrigerant in the system will migrate. As the machine is turned on, the refrigerant cannot circulate in the first time. The ambient temperature is low, and the time from the start of evaporation to the completion of a cycle of the refrigerant in the system is long. Since the refrigerant has no time to evaporate, the heat pump unit will have a startup liquid return phenomenon caused by insufficient system suction superheat, and a compressor oil shortage phenomenon caused by insufficient exhaust superheat, accompanied by a low low pressure and a fault report. In addition, due to the long-term freezing state, the physical properties of the lubricating oil in the system will change, and the starting resistance will increase relative to normal starting conditions, thereby causing the unit to fail to start under low temperature conditions. A Chinese patent application discloses a heat pump unit and a refrigeration startup low-pressure protection method thereof. The refrigeration startup low-pressure protection method detects the shutdown time at startup. If the shutdown time is greater than or equal to a set threshold, it automatically enters a long-term placement refrigeration startup mode. The long-term placement refrigeration startup mode controls the unit to enter a conventional refrigeration mode according to the comparison result between the system low pressure and the set pressure threshold. The disclosed technical solution can, to a certain extent, solve the problem of low-pressure protection and inability to start the heat pump unit during refrigeration start-up after long-term storage, and reduce the failure rate of the unit. However, since it uses the downtime as the condition for judging the entry into the long-term storage refrigeration start-up mode, there is a problem that the heat pump unit cannot be accurately improved during refrigeration start-up. Summary of the invention

[0003] The present invention provides a method for improving the freezing start of a heat pump unit to overcome the problem that the freezing start method of the heat pump unit in the prior art cannot accurately improve the freezing start of the heat pump unit.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for improving frozen startup of a heat pump unit, wherein a crankshaft heating belt is provided at the bottom of the compressor in the heat pump unit, and a gas-liquid separation heating belt is provided in the gas-liquid separator in the heat pump unit, and the crankshaft heating belt and the gas-liquid separation heating belt are both connected to a controller; the heat pump unit is provided with a first temperature sensor for detecting the ambient temperature Ta and a second temperature sensor for detecting the oil temperature Tb at the bottom of the compressor, and the first temperature sensor and the second temperature sensor are both connected to the controller, and the method for improving frozen startup of the heat pump unit comprises the following steps:

[0005] S1: using the first temperature sensor to collect the ambient temperature Ta, and the second temperature sensor to collect the oil temperature Tb at the bottom of the compressor, and transmitting the collected ambient temperature Ta and the oil temperature Tb at the bottom of the compressor to the controller;

[0006] S2: Determine Ta. If Ta>0, execute step S3; if 0≥Ta>-20℃, execute step S4; if -20℃≥Ta, execute step S5;

[0007] S3: If Ta>0, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt not to be turned on;

[0008] S4: If 0 ≥ Ta > -20°C, after the heat pump unit is powered on and not turned on, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to turn on and updates the oil temperature superheat ΔT = Ta-Tb in real time. When ΔT ≥ 3°C, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to turn off;

[0009] S5: If -20℃≥Ta, after the heat pump unit is powered on but not turned on, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to turn on and updates the oil temperature superheat ΔT=Ta-Tb in real time. When ΔT>10℃, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to turn off.

[0010] In the present technical solution, a crankshaft heating belt and a second temperature sensor are arranged at the inner bottom of the compressor, a gas-liquid separator heating belt is arranged in the gas-liquid separator, and the control logic of the start-up state of the heat pump unit is changed at the same time. It is possible to optimize the problems of start-up failure, too low low pressure, and air suction and liquid return in the start-up state of the heat pump unit, thereby achieving the purpose of accurately improving the frozen start-up of the heat pump unit.

[0011] Preferably, in step S3, if Ta>0, after the heat pump unit is powered on, the controller does not turn on the crankshaft heating belt and the gas-liquid separator heating belt regardless of whether the heat pump unit is turned on or not.

[0012] Preferably, in step S4, if the crankshaft heating belt and the gas-liquid separation heating belt are turned off when the heat pump unit receives the power-on command from the controller, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to be turned off, and updates the oil temperature superheat ΔT in real time. When ΔT≥3°C, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to be turned off.

[0013] Preferably, in step S4, if the heat pump unit receives a power-on command from the controller, the crankshaft heating belt and the gas-liquid separation heating belt are not turned off, the crankshaft heating belt and the gas-liquid separation heating belt are kept on, and the oil temperature superheat ΔT is updated in real time. When ΔT≥3°C, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to turn off.

[0014] Preferably, in step S5, if the crankshaft heating belt and the gas-liquid separation heating belt are turned off when the heat pump unit receives the power-on command from the controller, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to be turned off, and updates the oil temperature superheat ΔT in real time. When ΔT≥10°C, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to be turned off.

[0015] Preferably, in step S5, if the heat pump unit receives a power-on command from the controller, the crankshaft heating belt and the gas-liquid separation heating belt are not turned off, the crankshaft heating belt and the gas-liquid separation heating belt are kept on, and the oil temperature superheat ΔT is updated in real time. When ΔT≥10°C, the controller instructs the crankshaft heating belt and the gas-liquid separation heating belt to turn off.

[0016] Preferably, the first temperature sensor is arranged on the fin heat exchanger in the heat pump unit, and the second temperature sensor is arranged at the inner bottom of the compressor.

[0017] Preferably, the gas-liquid separation heating zone is arranged at the inner bottom of the gas-liquid separator.

[0018] Another aspect of the present invention provides a heat pump unit, which operates the above-mentioned heat pump unit improved freezing startup method during freezing startup.

[0019] Another aspect of the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method for improving freezing startup of a heat pump unit when executing the computer program.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging a crankshaft heating belt and a second temperature sensor at the inner bottom of the compressor, arranging a gas-liquid separator heating belt in the gas-liquid separator, and changing the control logic of the start-up state of the heat pump unit, the present invention can effectively improve the difficulty in the start-up process of the low-temperature heat pump air conditioner after a long period of freezing, and can effectively improve the low-pressure protection problem that occurs during low-temperature freezing startup, and can also increase the basic temperature of the unit startup state, thereby achieving the purpose of accurately improving the freezing startup of the heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of the method for improving freezing startup of a heat pump unit of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the heat pump unit of the present invention. DETAILED DESCRIPTION

[0023] The drawings are only for illustrative purposes and should not be construed as limiting the present invention. To better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and should not be construed as limiting the present invention.

[0024] Example 1

[0025] like Figure 1 As shown, a method for improving freezing startup of a heat pump unit, a crankshaft heating belt 2 is provided at the bottom of the compressor 1 in the heat pump unit, a gas-liquid separation heating belt 4 is provided in the gas-liquid separator 3 in the heat pump unit, and the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 are both connected to a controller; a first temperature sensor 5 for detecting the ambient temperature Ta and a second temperature sensor 6 for detecting the oil temperature Tb at the bottom of the compressor 1 are provided in the heat pump unit, and the first temperature sensor 5 and the second temperature sensor 6 are both connected to the controller, and the method for improving freezing startup of the heat pump unit includes the following steps:

[0026] S1: using the first temperature sensor 5 to collect the ambient temperature Ta, and the second temperature sensor 6 to collect the bottom oil temperature Tb in the compressor 1, and transmitting the collected ambient temperature Ta and the bottom oil temperature Tb in the compressor 1 to the controller;

[0027] S2: Determine Ta. If Ta>0, execute step S3; if 0≥Ta>-20℃, execute step S4; if -20℃≥Ta, execute step S5;

[0028] S3: If Ta>0, the controller controls the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 not to be turned on;

[0029] S4: If 0 ≥ Ta > -20°C, after the heat pump unit is powered on and not turned on, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to turn on and update the oil temperature superheat ΔT = Ta-Tb in real time. When ΔT ≥ 3°C, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to turn off;

[0030] S5: If -20℃≥Ta, after the heat pump unit is powered on but not turned on, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to turn on and update the oil temperature superheat ΔT=Ta-Tb in real time. When ΔT>10℃, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to turn off.

[0031] In this embodiment, by providing a crankshaft heating belt 2 and a second temperature sensor 6 at the inner bottom of the compressor 1, providing a gas-liquid separator heating belt 4 in the gas-liquid separator 3, and changing the control logic of the start-up state of the heat pump unit, it is possible to optimize the start-up failure, low pressure too low, suction liquid return and other problems in the start-up state of the heat pump unit, thereby achieving the purpose of accurately improving the freezing start-up of the heat pump unit.

[0032] It should be noted that in step S3, since Ta>0, the ambient temperature is greater than zero degrees at this time, so there is no need to turn on the crankshaft heating belt 2 and the gas-liquid separation heating belt 4. In step S4, since the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to turn on, the oil temperature Tb at the bottom of the compressor 1 is heated by the crankshaft heating belt 2 at this time, and the oil temperature Tb at the bottom of the compressor 1 will change in real time, so it is necessary to obtain the oil temperature Tb at the bottom of the compressor 1 in real time through the second temperature sensor 6, and update the oil temperature superheat ΔT=Ta-Tb in real time. When the oil temperature superheat ΔT≥3℃, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to turn off. In addition, it should be pointed out that in step S5, since the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to turn on, the oil temperature Tb at the bottom of the compressor 1 is heated by the crankshaft heating belt 2, and the oil temperature Tb at the bottom of the compressor 1 will change in real time. Therefore, it is necessary to obtain the oil temperature Tb at the bottom of the compressor 1 in real time through the second temperature sensor 6, and update the oil temperature superheat ΔT=Ta-Tb in real time. When the oil temperature superheat ΔT>10°C, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to turn off. It should also be noted that the heat pump unit belongs to the prior art, and the heat pump unit includes a fin heat exchanger 7, a compressor 1, a gas-liquid separator 3, a four-way valve 8 and a shell and tube heat exchanger 9. The first port of the fin heat exchanger 7 is connected to the first port of the four-way valve 8 through a pipeline, the second port of the four-way valve 8 is connected to the first port of the shell and tube heat exchanger 9, the second port of the shell and tube heat exchanger 9 is connected to the first port of the first filter 10, the second port of the first filter 10 is connected to the first port of the electronic expansion valve 11, the second port of the electronic expansion valve 11 is connected to the first port of the second filter 12, and the second port of the second filter 12 is connected to the second port of the fin heat exchanger 7; the third port of the four-way valve 8 is connected to the first port of the compressor 1, the second port of the compressor 1 is connected to the first port of the gas-liquid separator 3, and the second port of the gas-liquid separator 3 is connected to the fourth port of the four-way valve 8. The specific structure of the heat pump unit will not be repeated here one by one. The improvement of the heat pump unit of the present invention mainly lies in, such as Figure 2As shown, a crankshaft heating belt 2 is provided at the bottom of the compressor 1 in the heat pump unit, a gas-liquid separation heating belt 4 is provided in the gas-liquid separator 3 in the heat pump unit, and both the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 are connected to a controller; a first temperature sensor 5 for detecting the ambient temperature Ta and a second temperature sensor 6 for detecting the oil temperature Tb at the bottom of the compressor 1 are provided in the heat pump unit, and both the first temperature sensor 5 and the second temperature sensor 6 are connected to the controller.

[0033] Wherein, in step S3, if Ta>0, after the heat pump unit is powered on, the controller does not turn on the crankshaft heating belt 2 and the gas-liquid separator heating belt 4 regardless of whether the heat pump unit is turned on.

[0034] In addition, in step S4, if the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 are turned off when the heat pump unit receives the power-on command from the controller, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to be turned off, and updates the oil temperature superheat ΔT in real time. When ΔT≥3°C, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to be turned off.

[0035] Among them, in step S4, if the heat pump unit receives the power-on command from the controller, the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 are not turned off, the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 are kept on, and the oil temperature superheat ΔT is updated in real time. When ΔT≥3°C, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to turn off.

[0036] In addition, in step S5, if the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 are turned off when the heat pump unit receives the power-on command from the controller, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to be turned off, and updates the oil temperature superheat ΔT in real time. When ΔT≥10°C, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to be turned off.

[0037] Among them, in step S5, if the heat pump unit receives the power-on command from the controller, the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 are not turned off, the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 are kept on, and the oil temperature superheat ΔT is updated in real time. When ΔT≥10°C, the controller instructs the crankshaft heating belt 2 and the gas-liquid separation heating belt 4 to turn off.

[0038] In addition, the first temperature sensor 5 is arranged on the fin heat exchanger 7 in the heat pump unit, and the second temperature sensor 6 is arranged at the bottom of the compressor 1 .

[0039] The gas-liquid separation heating zone 6 is arranged at the inner bottom of the gas-liquid separator 3 .

[0040] Example 2

[0041] A heat pump unit is provided. The heat pump unit operates as the heat pump unit improved freezing startup method in embodiment 1 during freezing startup.

[0042] Example 3

[0043] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for improving freezing startup of a heat pump unit as in Example 1 is implemented.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for improving freezing startup of a heat pump unit, characterized in that: The bottom of the compressor in the heat pump unit is provided with a crankshaft heating belt, the gas-liquid separator in the heat pump unit is provided with a gas-liquid separation heating belt, and the crankshaft heating belt and the gas-liquid separation heating belt are both connected to a controller; the heat pump unit is provided with a first temperature sensor for detecting the ambient temperature Ta and a second temperature sensor for detecting the oil temperature Tb at the bottom of the compressor, and the first temperature sensor and the second temperature sensor are both connected to the controller. The method for improving the freezing start of the heat pump unit includes the following steps: S1: using the first temperature sensor to collect the ambient temperature Ta, and the second temperature sensor to collect the oil temperature Tb at the bottom of the compressor, and transmitting the collected ambient temperature Ta and the oil temperature Tb at the bottom of the compressor to the controller; S2: Determine Ta. If Ta>0, execute step S3; if 0≥Ta>-20℃, execute step S4; if -20℃≥Ta, execute step S5; S3: If Ta>0, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt not to be turned on; S4: If 0 ≥ Ta > -20°C, after the heat pump unit is powered on and not turned on, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt to turn on and updates the oil temperature superheat ΔT = Ta-Tb in real time. When ΔT ≥ 3°C, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt to turn off; S5: If -20℃ ≥ Ta, after the heat pump unit is powered on but not turned on, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt to turn on and updates the oil temperature superheat ΔT=Ta-Tb in real time. When ΔT>10℃, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt to turn off.

2. The method for improving freezing startup of a heat pump unit according to claim 1, characterized in that: In step S3, if Ta>0, after the heat pump unit is powered on, no matter whether the heat pump unit is turned on or not, the controller controls the crankshaft heating belt and the gas-liquid separator heating belt not to be turned on.

3. The method for improving freezing startup of a heat pump unit according to claim 1, characterized in that: In step S4, if the crankshaft heating belt and the gas-liquid separation heating belt are turned off when the heat pump unit receives the power-on command from the controller, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt to be turned on again, and updates the oil temperature superheat ΔT in real time. When ΔT≥3°C, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt to be turned off.

4. The method for improving freezing startup of a heat pump unit according to claim 1 or 3, characterized in that: In step S4, if the crankshaft heating belt and the gas-liquid separation heating belt are not turned off when the heat pump unit receives the power-on command from the controller, the crankshaft heating belt and the gas-liquid separation heating belt are kept on, and the oil temperature superheat ΔT is updated in real time. When ΔT≥3°C, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt to turn off.

5. The method for improving freezing startup of a heat pump unit according to claim 1, characterized in that: In step S5, if the crankshaft heating belt and the gas-liquid separation heating belt are turned off when the heat pump unit receives the power-on command from the controller, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt to be turned on again, and updates the oil temperature superheat ΔT in real time. When ΔT≥10°C, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt to be turned off.

6. The method for improving freezing startup of a heat pump unit according to claim 1 or 5, characterized in that: In step S5, if the crankshaft heating belt and the gas-liquid separation heating belt are not turned off when the heat pump unit receives the power-on command from the controller, the crankshaft heating belt and the gas-liquid separation heating belt are kept on, and the oil temperature superheat ΔT is updated in real time. When ΔT≥10°C, the controller controls the crankshaft heating belt and the gas-liquid separation heating belt to turn off.

7. The method for improving freezing startup of a heat pump unit according to claim 1, characterized in that: The first temperature sensor is arranged on the fin heat exchanger in the heat pump unit, and the second temperature sensor is arranged on the inner bottom of the compressor.

8. The method for improving freezing startup of a heat pump unit according to claim 1, characterized in that: The gas-liquid separation heating zone is arranged at the inner bottom of the gas-liquid separator.

9. A heat pump unit, characterized in that: The heat pump unit runs the method for improving frozen start-up of a heat pump unit according to any one of claims 1 to 8 during frozen start-up.

10. A computer device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for improving the freezing start-up of a heat pump unit as claimed in any one of claims 1 to 8 is implemented.

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