Control methods for heat pump units and heat pump units

Abstract

This invention relates to a control method for a heat pump unit and a heat pump unit itself. The heat pump unit includes an outdoor unit and an indoor unit connected together. The outdoor unit includes a first chamber for housing a first heat exchanger and a second chamber for housing a second heat exchanger, and an openable and closable vent is provided between the first and second chambers. The control method includes: controlling the start of a first compressor of the outdoor unit and controlling a first fan above the first chamber to rotate forward; obtaining the number of indoor units started; determining a start-up ratio based on the number of started indoor units, where the start-up ratio = number of started indoor units / total number of indoor units; determining whether the start-up ratio is greater than a first predetermined value and less than a second predetermined value; when the start-up ratio is greater than the first predetermined value and less than the second predetermined value, controlling the vent to open and controlling the second fan above the second chamber to rotate in reverse. This control method enhances the heat exchange efficiency of the first heat exchanger by opening the vent and reversing the second fan.

Description

Technical Field

[0001] This invention relates to the field of heat pump unit technology, and more specifically to a control method for a heat pump unit and a heat pump unit. Background Technology

[0002] As living standards continue to improve, people have increasingly higher requirements for their living environment. In order to obtain a comfortable temperature and humidity environment, air conditioning has become one of the essential devices in people's lives.

[0003] Commercial air conditioning widely uses air-source heat pump units. An air-source heat pump unit typically employs multiple heat pump units connected in parallel, with each unit comprising one outdoor unit and multiple indoor units. These indoor units are connected in parallel to each other and to the outdoor unit. In existing technology, the outdoor unit of an air-source heat pump unit usually includes two compressors and two heat exchangers. The two heat exchangers are respectively housed in two adjacent chambers, with a partition between the two chambers to ensure the independence of each chamber. A fan is also installed above each chamber to ensure the heat exchange efficiency of the heat exchangers within the chamber.

[0004] When more than half of the indoor units in an air source heat pump unit are started, two compressors often start simultaneously. However, when the indoor unit is not at full load, starting both compressors together often leads to energy waste. For example, suppose an outdoor unit of an air source heat pump unit is connected to ten indoor units. When six indoor units are started, the indoor unit may not be at full load. Starting one compressor would be sufficient to power all six indoor units. However, in existing air source heat pump units, both compressors must start in this situation, resulting in energy waste.

[0005] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, specifically the energy waste caused by the simultaneous operation of two compressors in a heat pump unit, this invention provides a control method for a heat pump unit. The heat pump unit includes an outdoor unit and an indoor unit connected together. The outdoor unit includes a first chamber for housing a first heat exchanger and a second chamber for housing a second heat exchanger, and an openable and closable vent is provided between the first chamber and the second chamber.

[0007] The control method includes:

[0008] The system controls the start of the first compressor of the outdoor unit and controls the first fan above the first chamber to rotate forward.

[0009] Obtain the number of indoor units that have been activated;

[0010] The activation ratio is determined based on the number of indoor units activated, wherein the activation ratio = number of indoor units activated / total number of indoor units;

[0011] Determine whether the activation ratio is greater than a first predetermined value and less than a second predetermined value;

[0012] When the activation ratio is greater than the first predetermined value and less than the second predetermined value, the vent is opened and the second fan above the second chamber is reversed.

[0013] The control method for heat pump units of this invention can determine the activation ratio based on the number of indoor units started. When the control method of this invention is activated, the heat pump unit starts only the first compressor and controls the first fan above the first chamber to rotate forward, driving air circulation across the surface of the first heat exchanger in the first chamber, carrying away heat from the first chamber and thus improving the heat exchange efficiency of the first heat exchanger. When the activation ratio is greater than a first predetermined value and less than a second predetermined value, the vent between the first and second chambers is opened, and the second fan above the second chamber is reversed, causing the second fan to blow air into the second chamber. It is understood that when the activation ratio is greater than the first predetermined value and less than the second predetermined value, a conventional heat pump unit needs to start two compressors simultaneously. However, the heat pump unit of this invention, by controlling the first fan to rotate forward and the second fan to rotate in reverse, allows the air delivered into the second chamber by the second fan to enter the first chamber through the vent, further improving the heat exchange efficiency of the first heat exchanger. This allows the first compressor to drive more indoor units, thereby achieving energy savings. In addition, compared to the traditional method of starting two compressors, the heat pump unit only operates one compressor in the above situation, which can reduce the operating time of the compressor in the heat pump unit, thereby extending the service life of the compressor.

[0014] In the preferred embodiment of the control method for the heat pump unit described above, the control method further includes:

[0015] Obtain the set temperature and ambient temperature of the room where each activated indoor unit is located;

[0016] A temperature difference value for each of the rooms is determined based on the set temperature and the ambient temperature of each room, wherein the temperature difference value = |set temperature - ambient temperature|;

[0017] The average of all the temperature differences is determined based on the temperature difference value of each of the rooms;

[0018] Determine whether the average value is less than or equal to the temperature threshold;

[0019] When the average value is less than or equal to the temperature threshold, the vent remains open and the second fan remains in reverse.

[0020] The control method of this invention can detect whether the temperature in the room where the activated indoor unit is located meets the requirements, that is, it determines whether the average temperature difference between all rooms is less than or equal to a temperature threshold. When the average temperature difference is less than or equal to the temperature threshold, it indicates that activating only the first compressor can ensure that the room temperature meets the requirements, so the vents are kept open and the second fan is kept running in reverse. Through the above settings, the control method of this invention can ensure the normal operation of the heat pump unit, not only ensuring that the room temperature meets the user's needs, but also achieving the effect of energy saving.

[0021] In the preferred embodiment of the control method for the heat pump unit described above, the control method further includes:

[0022] When the average value is greater than the temperature threshold, the vent is closed, the second compressor of the outdoor unit is started, and the second fan is rotated forward.

[0023] With the above settings, when the average temperature difference is greater than the temperature threshold, it means that starting only the first compressor cannot drive all the indoor units that are running. Starting the second compressor can ensure the normal operation of the heat pump unit.

[0024] In the preferred embodiment of the control method for the above-mentioned heat pump unit, the control method includes:

[0025] When the start-up ratio is less than or equal to the first predetermined value, the first compressor is kept running and the first fan is kept rotating in the forward direction.

[0026] With the above settings, the control method of the present invention can ensure the normal operation of the heat pump unit, so as to ensure that the room temperature meets the user's needs.

[0027] In the preferred embodiment of the control method for the above-mentioned heat pump unit, the control method includes:

[0028] When the start-up ratio is greater than or equal to the second predetermined value, the vent is closed, the second compressor of the outdoor unit is started, and the second fan is rotated forward.

[0029] With the above settings, the control method of the present invention can ensure the normal operation of the heat pump unit, so as to ensure that the room temperature meets the user's needs.

[0030] In the preferred embodiment of the control method for the heat pump unit described above, the temperature threshold is greater than or equal to 2°C and less than or equal to 10°C. With the above settings, the control method of the present invention can monitor the room temperature to meet the user's needs.

[0031] In the preferred embodiment of the control method for the heat pump unit described above, the first predetermined value is 1 / 2.

[0032] In the preferred embodiment of the control method for the heat pump unit described above, the second predetermined value is 1.

[0033] To address the aforementioned problems in the prior art, specifically the energy waste caused by the simultaneous operation of two compressors in a heat pump unit, this invention provides a heat pump unit. The heat pump unit employs the control method described above and includes an outdoor unit comprising a first chamber for housing a first heat exchanger and a second chamber for housing a second heat exchanger. An openable and closable vent is provided between the first and second chambers. Through this configuration, when a certain number of indoor units are started, the heat pump unit of this invention can enhance the heat exchange efficiency of the first heat exchanger in the first chamber by opening the vent, thereby enabling the first compressor to drive more indoor units without the need to operate two compressors simultaneously, thus achieving energy savings.

[0034] In the preferred embodiment of the heat pump unit described above, louvers are provided at the vent, and these louvers can be opened or closed by a motor. This configuration allows for easy control of the vent's opening and closing. Attached Figure Description

[0035] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0036] Figure 1 This is a schematic diagram of the outdoor unit (vent closed) in an embodiment of the heat pump unit of the present invention;

[0037] Figure 2 This is a schematic diagram of the outdoor unit (vents open) in an embodiment of the heat pump unit of the present invention;

[0038] Figure 3 This is a schematic flowchart of the control method for heat pump units according to the present invention;

[0039] Figure 4 This is a first flowchart of an embodiment of the control method for a heat pump unit according to the present invention;

[0040] Figure 5 This is a second flowchart of an embodiment of the control method for a heat pump unit of the present invention;

[0041] Figure 6 This is a schematic diagram of the first airflow direction of an embodiment of the heat pump unit of the present invention;

[0042] Figure 7 This is a second airflow diagram of an embodiment of the heat pump unit of the present invention;

[0043] Figure 8 This is a schematic diagram of the third airflow direction in an embodiment of the heat pump unit of the present invention.

[0044] List of reference numerals in the attached diagram:

[0045] 1. Heat pump unit; 10. Outdoor unit; 11. First chamber; 12. Second chamber; 13. Ventilation opening; 131. Louver; 15. First fan; 16. Second fan. Detailed Implementation

[0046] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0047] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] To address the technical problem of energy waste caused by the simultaneous operation of two compressors in existing heat pump units, this invention provides a control method for heat pump units. The heat pump unit 1 includes an outdoor unit 10 and an indoor unit (not shown) connected to each other. The outdoor unit 10 includes a first chamber 11 for housing a first heat exchanger (not shown) and a second chamber 12 for housing a second heat exchanger (not shown). An openable and closable vent 13 is provided between the first chamber 11 and the second chamber 12.

[0050] The control method includes:

[0051] The first compressor of the outdoor unit 10 is started, and the first fan 15 above the first chamber 11 is rotated forward (step S1);

[0052] Obtain the number of indoor units that are started (step S2);

[0053] The activation ratio is determined based on the number of indoor units activated. Activation ratio = number of indoor units activated / total number of indoor units (step S3).

[0054] Determine whether the start-up ratio is greater than the first predetermined value and less than the second predetermined value (step S4);

[0055] When the start-up ratio is greater than the first predetermined value and less than the second predetermined value, the control vent 13 is opened, and the control of the second fan 16 above the second chamber 12 is reversed (step S5).

[0056] Figure 1 This is a schematic diagram of the outdoor unit (vent closed) in an embodiment of the heat pump unit of the present invention; Figure 2 This is a schematic diagram of the outdoor unit (vents open) in an embodiment of the heat pump unit of the present invention. Figure 1 and Figure 2 As shown, the heat pump unit 1 of the present invention includes an outdoor unit 10 and a plurality of indoor units (not shown in the figure). The plurality of indoor units are connected in parallel and are connected to the outdoor unit 10. In one or more embodiments, the outdoor unit 10 includes adjacent first chambers 11 and second chambers 12. Based on Figure 1 (or Figure 2As shown in the diagram, the first chamber 11 is the chamber on the left side of the diagram. The first chamber 11 is used to house the first heat exchanger, and a first fan 15 is disposed above the first chamber 11. The second chamber 12 is the chamber on the right side of the diagram. The second chamber 12 is used to house the second heat exchanger, and a second fan 16 is disposed above the second chamber 12. An openable and closable vent 13 is provided between the first chamber 11 and the second chamber 12. In an alternative embodiment, the first chamber 11 may also be the chamber on the right side of the diagram, and the second chamber 12 may be the chamber on the left side of the diagram. In one or more embodiments, a louver 131 is provided at the vent 13. The louver 131 can be opened or closed by a motor (not shown). It is understood that the method of motor-driven opening and closing of the louver 131 is prior art; for example, the motor can drive a connecting rod connected to each blade of the louver 131, thereby driving the blades to move and realize the opening and closing of the vent 13. In an alternative embodiment, any other suitable structure can be provided at the vent 13, as long as the vent 13 can be opened and closed. The space below the first chamber 11 and the second chamber 12 also houses the first compressor (not shown in the figure), the second compressor (not shown in the figure), and the oil separator (not shown in the figure) of the outdoor unit 10. It is understood that... Figure 1 and Figure 2 To better illustrate the structure of the vent 13 and louvers 131, the first and second heat exchangers are not shown. Except for the vent 13, the configuration of the heat pump unit 1 of this invention is identical to that of prior art heat pump units.

[0057] Figure 3 This is a flowchart illustrating the control method of the present invention for a heat pump unit. Figure 3As shown, in one or more embodiments, when the control method of the present invention for the heat pump unit 1 begins, firstly, step S1 is executed, namely, controlling the first compressor of the outdoor unit 10 to start and controlling the first fan 15 above the first chamber 11 to rotate forward. When the first fan 15 rotates forward, the air in the first chamber 11 can be discharged through the first fan 15, thereby accelerating the air circulation in the first chamber 11 to dissipate heat from the first heat exchanger in the first chamber 11. Then, or simultaneously, step S2 is executed, namely, obtaining the number of indoor units started. Then, step S3 is executed, namely, determining the start-up ratio based on the number of indoor units started, where the start-up ratio = number of indoor units started / total number of indoor units. Then, step S4 is executed, namely, determining whether the start-up ratio is greater than a first predetermined value and less than a second predetermined value. In one or more embodiments, the first predetermined value is 1 / 2 and the second predetermined value is 1. In alternative embodiments, the first predetermined value and the second predetermined value can also be any other suitable value greater than 1 / 2 and less than 1, which can be adjusted according to the specific design. Next, step S5 is executed, whereby when the start-up ratio is greater than a first predetermined value and less than a second predetermined value, the vent 13 is opened, and the second fan 16 above the second chamber 12 is reversed. In one or more embodiments, the vent 13 can be opened by controlling the motor to drive the louvers 131 at the vent 13. When the number of indoor units started exceeds half of the total number of indoor units, i.e., when the start-up ratio is greater than 1 / 2, the vent 13 is opened, and the second fan 16 above the second chamber 12 is reversed. When the second fan 16 is reversed, air from outside the outdoor unit 10 can be sent into the second chamber 12 through the second fan 16, and enter the first chamber 11 through the vent 13 (the airflow direction in this state can be referenced). Figure 8 This increases the airflow for heat exchange with the first heat exchanger, thereby improving the heat exchange efficiency of the first heat exchanger and ensuring that the heat pump unit 1 can drive more than half of the indoor units when only the first compressor is running. This setup not only ensures that the room temperature meets the user's needs but also achieves energy savings. Furthermore, compared to the traditional method of starting two compressors, the heat pump unit operates only one compressor in this situation, reducing the compressor's operating time and extending its lifespan. After completing step S5, the control method for the heat pump unit 1 of this invention ends.

[0058] Figure 4 This is a first flowchart of an embodiment of the control method for a heat pump unit according to the present invention; Figure 5 This is a second flowchart of an embodiment of the control method for a heat pump unit of the present invention;

[0059] Figure 6 This is a schematic diagram of the first airflow direction of an embodiment of the heat pump unit of the present invention; Figure 7This is a second airflow diagram of an embodiment of the heat pump unit of the present invention; Figure 8 This is a third schematic diagram of the airflow direction in an embodiment of the heat pump unit of the present invention. It can be understood that... Figures 6 to 8 The arrows in the diagram represent the direction of airflow.

[0060] like Figure 4 As shown, in one or more embodiments, when the control method of the present invention for the heat pump unit 1 begins, firstly, step S1 is executed, that is, the first compressor of the outdoor unit 10 is started, and the first fan 15 above the first chamber 11 is rotated forward. When the first fan 15 rotates forward, the air in the first chamber 11 can be discharged through the first fan 15, thereby accelerating the air circulation in the first chamber 11 to dissipate heat from the first heat exchanger in the first chamber 11. Then, or simultaneously, step S2 is executed, that is, the number of indoor units started is obtained. Then, step S3 is executed, that is, the start-up ratio is determined based on the number of indoor units started, the start-up ratio = number of indoor units started / total number of indoor units. The start-up ratio is the proportion of indoor units started among all indoor units connected to the outdoor unit 10. Then, step S4 is executed, that is, it is determined whether the start-up ratio is greater than a first predetermined value and less than a second predetermined value. In one or more embodiments, the first predetermined value is 1 / 2 and the second predetermined value is 1. In alternative embodiments, the first predetermined value and the second predetermined value can also be any other suitable value greater than 1 / 2 and less than 1, which can be adjusted according to the specific design. When the judgment result of step S4 is yes, that is, when the activation ratio is greater than the first predetermined value and less than the second predetermined value, step S51 is executed, that is, the vent 13 is opened and the second fan 16 above the second chamber 12 is reversed. In one or more embodiments, when the number of activated indoor units exceeds half of the total number of indoor units, the vent 13 is opened and the second fan 16 above the second chamber 12 is reversed, so that air outside the outdoor unit 10 can be sent into the second chamber 12 through the second fan 16 and enter the first chamber 11 through the vent 13 (the airflow direction in this state can be referred to...). Figure 8 This increases the airflow for heat exchange with the first heat exchanger, thereby improving its heat exchange efficiency and ensuring that the heat pump unit can power more than half of the indoor units when only the first compressor is running. This setup not only ensures the room temperature meets user needs but also saves energy. Furthermore, compared to the traditional method of starting two compressors, the heat pump unit operates only one compressor in this configuration, reducing the compressor's operating time and extending its lifespan.

[0061] See also Figure 4After executing step S51, step S6 is executed, which involves obtaining the set temperature and ambient temperature of the room where each activated indoor unit is located. The set temperature refers to the temperature set by the user. The ambient temperature is the detected temperature of the room where the indoor unit is located. In one or more embodiments, the indoor unit has a temperature sensor for detecting the room temperature, i.e., the ambient temperature. Next, step S7 is executed, which involves determining the temperature difference for each room based on the set temperature and ambient temperature of each room, where the temperature difference = |set temperature - ambient temperature|. Next, step S8 is executed, which involves determining the average value of all temperature differences based on the temperature difference for each room. Next, step S9 is executed, which involves determining whether the average value is less than or equal to a temperature threshold. The temperature threshold is the allowable temperature difference set by the heat pump system. When the difference between the set temperature and the ambient temperature is less than or equal to the temperature threshold, it means that the room temperature meets the user's needs. In one or more embodiments, the temperature threshold is 2°C. In alternative embodiments, the temperature threshold can also be any other suitable value greater than or equal to 2°C and less than or equal to 10°C, which can be adjusted according to actual design requirements. When the judgment result of step S9 is yes, that is, when the average value is less than or equal to the temperature threshold, step S10 is executed, that is, the vent 13 remains open and the second fan 16 remains in reverse. An average value less than or equal to the temperature threshold indicates that only the first compressor is activated, and the method of enhancing the heat exchange efficiency of the first heat exchanger by opening the vent 13 and controlling the second fan 16 to reverse ensures that the temperature in each room meets the user's needs; therefore, maintaining the above operating state is sufficient. It is understood that... Figure 8 The diagram shows the airflow direction through the outdoor unit 10 under the aforementioned operating conditions (i.e., the first compressor is started, the first fan 15 rotates forward, the vent 13 is open, and the second fan 16 rotates in reverse). This configuration is beneficial for energy conservation. After completing step S10, the control method for the heat pump unit of the present invention ends.

[0062] See also Figure 4 When the result of step S9 is negative, i.e., when the average value is greater than the temperature threshold, step S11 is executed, i.e., the vent 13 is closed, the second compressor of the outdoor unit 10 is started, and the second fan 16 is rotated forward. When the average value is greater than the temperature threshold, it indicates that the temperature in each room cannot meet the user's needs, therefore the second compressor needs to be started. This is understandable. Figure 7 The diagram shows the airflow direction through the outdoor unit 10 under the aforementioned operating conditions (i.e., both the first and second compressors are running, both the first fan 15 and the second fan 16 are rotating forward, and the vent 13 is closed). After completing step S11, the control method for the heat pump unit of the present invention ends.

[0063] In one or more embodiments, the outdoor unit of the heat pump unit of the present invention is connected to 10 indoor units, which are respectively arranged in 10 different rooms. When the air conditioning is turned on in 6 rooms, that is, when 6 indoor units are activated, the activation ratio is 3 / 5, which is greater than 1 / 2. At this time, the first compressor of the outdoor unit 10 starts, the first fan 15 above the first chamber 11 rotates forward, the vent 13 opens, and the second fan 16 on the second chamber 12 rotates in reverse to improve the heat exchange efficiency of the first heat exchanger. After operating in the above state for a period of time, the set temperature and ambient temperature of the room where each activated indoor unit is located are detected. For example: the first room has a set temperature of 25℃ and an ambient temperature of 26℃, with a temperature difference of 1℃; the second room has a set temperature of 24℃ and an ambient temperature of 27℃, with a temperature difference of 3℃; the third room has a set temperature of 20℃ and an ambient temperature of 25℃, with a temperature difference of 5℃; the fourth room has a set temperature of 23℃ and an ambient temperature of 27℃, with a temperature difference of 4℃; the fifth room has a set temperature of 27℃ and an ambient temperature of 27℃, with a temperature difference of 0℃; and the sixth room has a set temperature of 24℃ and an ambient temperature of 27℃, with a temperature difference of 3℃. The average temperature difference across all rooms is approximately (1+3+5+4+0+3) / 6≈2.7℃. Since this average is greater than the temperature threshold (2℃), starting only the first compressor is insufficient to guarantee the normal operation of all indoor units. Therefore, the ventilation vent 13 is closed, the second compressor of the outdoor unit is started, and the second fan 16 is rotated forward.

[0064] like Figure 5 As shown, when the judgment result of step S4 is negative, step S52 is executed, that is, when the start-up ratio is less than or equal to the first predetermined value, the first compressor is kept running and the first fan 15 is kept rotating forward. In one or more embodiments, a start-up ratio less than or equal to 1 / 2 indicates that the number of indoor units started does not exceed half of the total number of indoor units, and only one compressor needs to be started to ensure the normal operation of the started indoor units. It is understood that... Figure 6 The diagram shows the airflow direction through the outdoor unit 10 under the aforementioned operating state (i.e., the first compressor is started, the first fan 15 is rotating forward, and the vent 13 is closed). Next, step S53 is executed, whereby when the start-up ratio is greater than or equal to the second predetermined value, the vent 13 is closed, the second compressor of the outdoor unit is started, and the second fan 16 is rotated forward. The airflow direction under this operating state is shown in [reference needed]. Figure 7 In one or more embodiments, the second predetermined value is 1. Therefore, when the start-up ratio is equal to 1, all indoor units start, requiring the second compressor to be started. After completing step S53, the control method for heat pump units of the present invention ends.

[0065] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for a heat pump unit, characterized in that, The heat pump unit includes an outdoor unit and an indoor unit connected together. The outdoor unit includes a first chamber for housing a first heat exchanger and a second chamber for housing a second heat exchanger, and an openable and closable vent is provided between the first chamber and the second chamber. The control method includes: The system controls the start of the first compressor of the outdoor unit and controls the first fan above the first chamber to rotate forward. Obtain the number of indoor units that have been activated; The activation ratio is determined based on the number of indoor units activated, wherein the activation ratio = number of indoor units activated / total number of indoor units; Determine whether the activation ratio is greater than a first predetermined value and less than a second predetermined value; When the activation ratio is greater than the first predetermined value and less than the second predetermined value, the vent is opened and the second fan above the second chamber is reversed.

2. The control method for a heat pump unit according to claim 1, characterized in that, The control method further includes: Obtain the set temperature and ambient temperature of the room where each activated indoor unit is located; A temperature difference value for each of the rooms is determined based on the set temperature and the ambient temperature of each room, wherein the temperature difference value = |set temperature - ambient temperature|; The average of all the temperature differences is determined based on the temperature difference value of each of the rooms; Determine whether the average value is less than or equal to the temperature threshold; When the average value is less than or equal to the temperature threshold, the vent remains open and the second fan remains in reverse.

3. The control method for a heat pump unit according to claim 2, characterized in that, The control method further includes: When the average value is greater than the temperature threshold, the vent is closed, the second compressor of the outdoor unit is started, and the second fan is rotated forward.

4. The control method for a heat pump unit according to claim 1, characterized in that, The control method includes: When the start-up ratio is less than or equal to the first predetermined value, the first compressor is kept running and the first fan is kept rotating in the forward direction.

5. The control method for a heat pump unit according to claim 1, characterized in that, The control method includes: When the start-up ratio is greater than or equal to the second predetermined value, the vent is closed, the second compressor of the outdoor unit is started, and the second fan is rotated forward.

6. The control method for a heat pump unit according to claim 3, characterized in that, The temperature threshold is greater than or equal to 2°C and less than or equal to 10°C.

7. The control method for a heat pump unit according to claim 1, characterized in that, The first predetermined value is 1 / 2.

8. The control method for a heat pump unit according to claim 1, characterized in that, The second predetermined value is 1.

9. A heat pump unit, characterized in that, The heat pump unit employs the control method for the heat pump unit according to any one of claims 1-8, and the heat pump unit includes an outdoor unit, the outdoor unit including a first chamber for placing a first heat exchanger and a second chamber for placing a second heat exchanger, and an openable and closable vent is provided between the first chamber and the second chamber.

10. The heat pump unit according to claim 9, characterized in that, The ventilation opening is equipped with louvers, which can be opened or closed by a motor.

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