A control method of a heat pump system, a computer device and a heat pump system thereof

Abstract

The present application relates to a kind of control method of heat pump system, computer equipment and its heat pump system, the control method of heat pump system includes the following steps: obtaining low pressure, if low pressure < first preset pressure, obtain high pressure and calculate pressure ratio, if pressure ratio ≥ first preset pressure ratio, heat pump system enters high pressure ratio state and carries out high pressure ratio operating condition adjustment;High pressure ratio operating condition adjustment method includes preset frequency adjustment method and preset opening degree adjustment method;Preset frequency adjustment method includes the following steps: obtaining ambient temperature and the water temperature of jacket heat exchanger, calculate and adjust compressor frequency to target frequency;Preset opening degree adjustment method includes the following steps: obtaining the real-time opening degree of electronic expansion valve and the real-time frequency of compressor, calculate and adjust electronic expansion valve opening degree to target opening degree.The control method of the present application can effectively identify high pressure ratio state and ensure the stable operation of heat pump system under the joint action of frequency adjustment and opening degree adjustment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump systems, in particular to a control method of a heat pump system, computer equipment and a heat pump system thereof. BACKGROUND

[0002] The two-supply heat pump unit is generally composed of a compressor, a four-way valve, a finned heat exchanger, a double-pipe heat exchanger, an electronic expansion valve and the like. Different types and adjustments are required for the heat pump unit under different working conditions.

[0003] The inventor has found through a large number of practices that the existing two-supply heat pump unit has problems such as uncontrolled exhaust and water temperature not meeting user requirements when adjusted under high pressure ratio conditions. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a control method of a heat pump system, computer equipment and a heat pump system thereof, which can effectively identify the high pressure ratio state of the heat pump system and avoid adjusting the compressor when the exhaust is out of control and the water temperature cannot meet the user's requirements. On the one hand, the frequency of the compressor is calculated and adjusted according to the ambient temperature and the water inlet temperature, and on the other hand, the real-time opening of the electronic expansion valve is calculated and adjusted according to the real-time opening, the real-time frequency and the pressure ratio value. The compressor of the heat pump system can have a suitable operating frequency under high pressure ratio conditions, and the electronic expansion valve of the heat pump system can have a suitable opening under high pressure ratio conditions. The heat pump system can keep stable operation under high pressure ratio conditions through the joint action of the two.

[0005] A control method of a heat pump system, the heat pump system comprising a four-way valve, a compressor, a double-pipe heat exchanger, a finned heat exchanger, an electronic expansion valve, a low-pressure pressure sensor, a high-pressure pressure sensor, an ambient temperature sensor and a water temperature sensor; four connectors of the four-way valve are respectively communicated with an exhaust end of the compressor, a gas collecting end of the finned heat exchanger, a suction end of the compressor and an input end of the double-pipe heat exchanger; a first end of the electronic expansion valve is communicated with an output end of the double-pipe heat exchanger, and a second end of the electronic expansion valve is communicated with a liquid distribution end of the finned heat exchanger; the low-pressure pressure sensor is arranged in a pipeline communicating the four-way valve with the suction end of the compressor; the high-pressure pressure sensor is arranged in a pipeline communicating the four-way valve with the exhaust end of the compressor; the ambient temperature sensor is arranged at a position directly contacting the environment outside the heat pump system; and the water temperature sensor is arranged in a pipeline communicated with a water inlet end of the double-pipe heat exchanger.

[0006] The control method of the heat pump system comprises the following steps:

[0007] The low-pressure pressure of the compressor is obtained. If the low-pressure pressure is less than the first preset pressure, the high-pressure pressure of the compressor is obtained. The pressure ratio is calculated based on the high-pressure pressure and the low-pressure pressure. If the pressure ratio is greater than or equal to the first preset pressure ratio, the heat pump system enters the high-pressure ratio state and performs high-pressure ratio operating condition adjustment.

[0008] The method for adjusting the high pressure ratio includes adjusting the operating frequency of the compressor according to a preset frequency adjustment method and adjusting the opening of the electronic expansion valve according to a preset opening adjustment method.

[0009] The preset frequency adjustment method includes the following steps: obtaining the ambient temperature and the inlet water temperature of the shell-and-tube heat exchanger, calculating the target frequency based on the ambient temperature and the inlet water temperature, and adjusting the operating frequency of the compressor to the target frequency;

[0010] The preset opening adjustment method includes the following steps: obtaining the real-time opening of the electronic expansion valve and the real-time frequency of the compressor, calculating the target opening based on the real-time opening, the real-time frequency and the pressure ratio, and adjusting the opening of the electronic expansion valve to the target opening.

[0011] The control method for a heat pump system described in this invention can effectively identify the high pressure ratio state and ensure the stable operation of the heat pump system through the combined action of frequency regulation and opening degree regulation.

[0012] Furthermore, the method for calculating the target frequency is as follows: ,in Where is the target frequency, Ta is the ambient temperature, Ti is the inlet water temperature, and C is a constant.

[0013] Furthermore, the method for calculating the target opening is as follows: ,in denoted as the target opening, Nmin as the real-time opening, k as the critical pressure ratio, K as the pressure ratio, and F as the real-time frequency.

[0014] Furthermore, the priority of the high-pressure ratio adjustment is as follows: first adjust the operating frequency of the compressor, then adjust the opening of the electronic expansion valve. This ensures that the compressor of the heat pump system has a suitable operating frequency under high-pressure ratio conditions, and then ensures that the electronic expansion valve has a suitable opening at low frequencies, making the high-pressure ratio adjustment more precise and thus improving the stability of the heat pump system under high-pressure ratio conditions.

[0015] Furthermore, the preset opening adjustment method also includes the following steps: if the real-time opening is greater than or equal to the target opening, then the opening of the electronic expansion valve is adjusted to the target opening; if the real-time opening is less than the target opening, then the opening of the electronic expansion valve is maintained at the current real-time opening. When the calculated target opening is greater than the real-time opening, no opening adjustment is performed, so that the heat pump system operates more stably under high pressure ratio conditions.

[0016] Furthermore, the method for calculating the pressure ratio is as follows: Where K is the pressure ratio, Ph is the high pressure, and Pl is the low pressure.

[0017] Furthermore, the method also includes the following steps: when the heat pump system is in a high-pressure ratio state, the high-pressure ratio operating condition is adjusted according to a preset adjustment cycle. Adjusting the high-pressure ratio operating condition according to the preset adjustment cycle avoids instability of the heat pump system caused by excessively fast or slow adjustment frequencies.

[0018] Furthermore, when the heat pump system is in a high-pressure ratio state, the preset adjustment period is calculated based on the rate of change of the high-pressure. Calculating the preset adjustment period based on the rate of change of the high-pressure allows for more precise adjustment of the heat pump system under high-pressure ratio conditions, thereby improving the stability of the heat pump system's operation under these conditions.

[0019] The present invention also provides a computer device for controlling a heat pump system, comprising:

[0020] The signal acquisition module is used to acquire the low pressure, the high pressure, the ambient temperature, the inlet water temperature, the real-time frequency, and the real-time opening degree.

[0021] The judgment module is used to determine whether the low pressure is less than or below a preset pressure and whether the pressure ratio value is not less than a first preset pressure ratio value.

[0022] The execution module is used to calculate the pressure ratio value based on the high pressure and the low pressure when the low pressure is less than the first preset pressure; and to cause the heat pump system to enter the high pressure ratio state and perform high pressure ratio operation condition adjustment when the pressure ratio value is greater than or equal to the first preset pressure ratio value.

[0023] The present invention also provides a heat pump system, including at least one memory and at least one processor;

[0024] A memory for storing one or more computer programs, which, when executed by a processor, are used to implement the steps of a control method for any of the aforementioned heat pump systems.

[0025] When one or more computer programs are executed by at least one processor, the at least one processor implements the steps of any of the above-described heat pump system control methods.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. It can effectively identify the high pressure ratio state of the heat pump system, avoiding adjustments only when the compressor discharge is out of control or the water temperature fails to meet user requirements. On one hand, it calculates and adjusts the compressor frequency based on ambient temperature and inlet water temperature; on the other hand, it calculates and adjusts the real-time opening of the electronic expansion valve based on real-time opening degree, real-time frequency, and pressure ratio value. This ensures that both the compressor and the electronic expansion valve of the heat pump system have appropriate operating frequencies and opening degrees under high pressure ratio conditions, thus ensuring stable operation of the heat pump system under these conditions.

[0028] 2. It can first ensure that the compressor of the heat pump system has a suitable operating frequency under high pressure ratio conditions, and then ensure that the electronic expansion valve has a suitable opening degree when operating at low frequency, so that the high pressure ratio adjustment is more precise, thereby making the heat pump system more stable under high pressure ratio conditions.

[0029] 3. When the calculated target opening degree is greater than the real-time opening degree, no adjustment of the opening degree is made, so that the heat pump system can operate more stably under high pressure ratio conditions.

[0030] 4. Adjust the high pressure ratio according to the preset adjustment cycle to avoid instability of the heat pump system caused by too fast or too slow adjustment frequency.

[0031] 5. The preset adjustment cycle is calculated based on the rate of change of high pressure, so that the adjustment of the heat pump system under high pressure ratio conditions is more precise, thereby making the heat pump system more stable under high pressure ratio conditions.

[0032] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a heat pump system according to one embodiment;

[0034] Figure 2 This is a schematic flowchart of a control method for a heat pump system according to one embodiment;

[0035] Figure 3 This is a schematic flowchart of a control method for a heat pump system according to one embodiment.

[0036] Figure 4 This is a schematic flowchart of a control method for a heat pump system according to one embodiment.

[0037] Among them, 1 is a four-way valve, 2 is a compressor, 3 is a gas-liquid separator, 4 is a shell-and-tube heat exchanger, 5 is a finned heat exchanger, 6 is an economizer, 7 is a three-way connector, 8 is an electronic expansion valve, 9 is an enthalpy-increasing electronic expansion valve, 10 is a low-pressure sensor, and 11 is a high-pressure sensor. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0039] It should be understood that the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments.

[0040] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the embodiments in this application.

[0041] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0042] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0043] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the embodiments of this application is limited only by the appended claims.

[0044] This invention provides a control method for a heat pump system. For ease of understanding, this invention illustrates the method using a heat pump system that is applicable to the control method of this invention. It should be noted that the heat pump system illustrated in this invention is merely illustrative. The components that are related to each other can be physically connected or physically separated. For example, the connection between two components generally means that the two components are connected through a pipe. The connection between two components can be a direct contact connection or an indirect connection achieved through a third component. Similarly, the fixing of two components can be direct or indirect. Those skilled in the art can select some or all of the modules to achieve the purpose of this invention according to actual needs.

[0045] This invention provides a control method for a heat pump system. Please refer to [link / reference]. Figure 1 The heat pump system is a dual-supply system, including: a four-way valve 1, a compressor 2, a gas-liquid separator 3, a shell-and-tube heat exchanger 4, a finned heat exchanger 5, an economizer 6, a three-way connector 7, an electronic expansion valve 8, an enthalpy-increasing electronic expansion valve 9, a low-pressure sensor 10, a high-pressure sensor 11, an ambient temperature sensor, and a water temperature sensor. The discharge end of the compressor 2 is connected to the first connector of the four-way valve 1, the second connector of the four-way valve 1 is connected to the input end of the shell-and-tube heat exchanger 4, the output end of the shell-and-tube heat exchanger 4 is connected to the first input end of the economizer 6, and the first output end of the economizer 6 is connected to the three-way connector 7. The first end of the three-way connector 7 is connected to the second end of the enthalpy-increasing electronic expansion valve 9, the other end of the enthalpy-increasing electronic expansion valve 9 is connected to the second input end of the economizer 6, the second output end of the economizer 6 is connected to the enthalpy-increasing end of the compressor 2, the third end of the three-way connector 7 is connected to the first end of the electronic expansion valve 8, the other end of the electronic expansion valve 8 is connected to the liquid distribution end of the finned heat exchanger 5, the gas collection end of the finned heat exchanger 5 is connected to the third end of the four-way valve 1, the fourth end of the four-way valve 1 is connected to the input end of the gas-liquid separator 3, and the output end of the gas-liquid separator 3 is connected to the suction end of the compressor 2. A low-pressure sensor 10 is installed in the pipe connecting the fourth end of the four-way valve 1 to the input end of the gas-liquid separator 3. The low-pressure sensor 10 is used to detect low-pressure. A high-pressure sensor 11 is installed in the pipe connecting the first end of the four-way valve 1 to the exhaust end of the compressor 2. The high-pressure sensor 11 is used to detect high-pressure. An ambient temperature sensor is installed at a location that is in direct contact with the external environment of the heat pump system. The ambient temperature sensor is used to detect the ambient temperature. A water temperature sensor is installed in the pipe connecting to the inlet end of the shell-and-tube heat exchanger 4. The water temperature sensor is used to detect the inlet water temperature of the shell-and-tube heat exchanger 4. The applicable ambient temperature range of the heat pump system in this embodiment is -30℃ to 40℃, and the applicable water temperature range at the outlet end of the shell-and-tube heat exchanger is 0℃ to 60℃.

[0046] The control method of the heat pump system of the present invention will be described below based on the dehumidifier of this example.

[0047] In one embodiment, see Figure 2 The control method for a heat pump system includes the following steps:

[0048] Obtain the compressor's low-pressure P1. If the low-pressure pressure is less than the first preset pressure (in this embodiment, the first preset pressure is 0.3 MPa), obtain the compressor's high-pressure Ph. Calculate the pressure ratio K based on the high-pressure and low-pressure values. The formula for calculating the pressure ratio in this embodiment is as follows: If the pressure ratio is greater than or equal to the first preset pressure ratio (the first preset pressure ratio in this embodiment is 10), the heat pump system enters the high pressure ratio state and performs high pressure ratio operation condition adjustment.

[0049] The high-pressure ratio adjustment method includes adjusting the compressor's operating frequency according to a preset frequency adjustment method and adjusting the opening of the electronic expansion valve according to a preset opening adjustment method.

[0050] The preset frequency adjustment method includes the following steps: obtaining the ambient temperature Ta and the inlet water temperature Ti of the shell-and-tube heat exchanger, and calculating the target frequency based on the ambient temperature and the inlet water temperature. The compressor's operating frequency is adjusted to the target frequency; the formula for calculating the target frequency in this embodiment is as follows: , where C is a constant, and in this embodiment C=60.

[0051] The preset opening adjustment method includes the following steps: obtaining the real-time opening degree Nmin of the electronic expansion valve and the real-time frequency F of the compressor, and calculating the target opening degree based on the real-time opening degree, real-time frequency, and pressure ratio. The opening degree of the electronic expansion valve is adjusted to the target opening degree; the formula for calculating the target opening degree in this embodiment is as follows: , where k is the critical value of the pressure ratio, and in this embodiment k=10.

[0052] To further improve the operational stability of the heat pump system under high pressure ratio conditions, in one embodiment, please refer to... Figure 3 The control method for the heat pump system also includes the following steps: the priority of high pressure ratio adjustment is: first adjust the operating frequency of the compressor, then adjust the opening of the electronic expansion valve. This ensures that the compressor of the heat pump system has a suitable operating frequency under high pressure ratio conditions, and then ensures that the electronic expansion valve has a suitable opening at low frequency operation, making the high pressure ratio adjustment more precise, and thus improving the stability of the heat pump system under high pressure ratio conditions.

[0053] To further improve the operational stability of the heat pump system under high pressure ratio conditions, in one embodiment, please refer to... Figure 4The preset opening adjustment method also includes the following steps: if the real-time opening is greater than or equal to the target opening, the opening of the electronic expansion valve is adjusted to the target opening; if the real-time opening is less than the target opening, the opening of the electronic expansion valve is maintained at the current real-time opening. When the calculated target opening is greater than the real-time opening, no opening adjustment is performed, so that the heat pump system can operate more stably under high pressure ratio conditions.

[0054] To further improve the operational stability of the heat pump system under high pressure ratio conditions, in one embodiment, the control method of the heat pump system further includes the following steps: when the heat pump system is in a high pressure ratio state, adjusting the high pressure ratio condition according to a preset adjustment cycle. Adjusting the high pressure ratio condition according to the preset adjustment cycle avoids instability of the heat pump system caused by excessively fast or slow adjustment frequencies. In this embodiment, the preset adjustment cycle is 1 minute; in other embodiments, the preset adjustment cycle can be adjusted between 0.5 minutes and 1.5 minutes.

[0055] To further improve the operational stability of the heat pump system under high pressure ratio conditions, in one embodiment, the control method of the heat pump system further includes the following steps: when the heat pump system is in a high pressure ratio state, a preset adjustment period is calculated based on the rate of change of the high pressure. Calculating the preset adjustment period based on the rate of change of the high pressure makes the adjustment of the heat pump system under high pressure ratio conditions more precise, thereby improving the operational stability of the heat pump system under high pressure ratio conditions. The preset adjustment period T in this embodiment is calculated as T = 100(Ph2 - Ph1) + 90, where Ph1 is the initial high pressure, and Ph2 is the high pressure after a 1-minute interval. The faster the pressure decreases, the shorter the adjustment period.

[0056] In a second aspect, the present invention also provides a computer device for controlling a heat pump system, comprising:

[0057] The signal acquisition module is used to acquire low pressure, high pressure, ambient temperature, inlet water temperature, real-time frequency, and real-time opening degree.

[0058] The judgment module is used to determine whether the low pressure is less than or below the preset pressure and whether the pressure ratio is not less than the first preset pressure ratio.

[0059] The execution module is used to, when the low pressure is less than the first preset pressure, according to... Calculate the pressure ratio value; used to enable the heat pump system to enter the high pressure ratio state and perform high pressure ratio operation adjustment when the pressure ratio value is greater than or equal to the first preset pressure ratio value.

[0060] In one embodiment, the computer device further includes:

[0061] The priority execution module is used to adjust the compressor's operating frequency first and then the opening of the electronic expansion valve when adjusting the high pressure ratio.

[0062] In one embodiment, the computer device further includes:

[0063] The opening degree judgment module is used to determine whether the real-time opening degree is greater than or equal to the target opening degree;

[0064] The opening adjustment module is used to adjust the opening of the electronic expansion valve to the target opening when the real-time opening is greater than or equal to the target opening; and to maintain the opening of the electronic expansion valve at the current real-time opening when the real-time opening is less than the target opening.

[0065] In one embodiment, the computer device further includes:

[0066] The timing module is used for repeated timing, with each timing duration equal to the preset adjustment cycle;

[0067] The cycle adjustment module is used to adjust the high voltage ratio once the timing duration reaches the preset adjustment cycle.

[0068] In one embodiment, the computer device further includes:

[0069] The high pressure change rate calculation module is used to calculate the rate of change of high pressure within 1 minute.

[0070] The preset adjustment period setting module is used to set the preset adjustment period according to T = 100(Ph2-Ph1) + 90.

[0071] Thirdly, the present invention also provides a heat pump system, including at least one memory and at least one processor;

[0072] A memory for storing one or more computer programs, which, when executed by a processor, are used to implement the steps of a control method for any of the aforementioned heat pump systems.

[0073] When one or more computer programs are executed by at least one processor, the at least one processor implements the steps of any of the above-described heat pump system control methods.

[0074] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0075] 1. It can effectively identify the high pressure ratio state of the heat pump system, avoiding adjustments only when the compressor discharge is out of control or the water temperature fails to meet user requirements. On one hand, it calculates and adjusts the compressor frequency based on ambient temperature and inlet water temperature; on the other hand, it calculates and adjusts the real-time opening of the electronic expansion valve based on real-time opening degree, real-time frequency, and pressure ratio value. This ensures that both the compressor and the electronic expansion valve of the heat pump system have appropriate operating frequencies and opening degrees under high pressure ratio conditions, thus ensuring stable operation of the heat pump system under these conditions.

[0076] 2. It can first ensure that the compressor of the heat pump system has a suitable operating frequency under high pressure ratio conditions, and then ensure that the electronic expansion valve has a suitable opening degree when operating at low frequency, so that the high pressure ratio adjustment is more precise, thereby making the heat pump system more stable under high pressure ratio conditions.

[0077] 3. When the calculated target opening degree is greater than the real-time opening degree, no adjustment of the opening degree is made, so that the heat pump system can operate more stably under high pressure ratio conditions.

[0078] 4. Adjust the high pressure ratio according to the preset adjustment cycle to avoid instability of the heat pump system caused by too fast or too slow adjustment frequency.

[0079] 5. The preset adjustment cycle is calculated based on the rate of change of high pressure, so that the adjustment of the heat pump system under high pressure ratio conditions is more precise, thereby making the heat pump system more stable under high pressure ratio conditions.

[0080] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and the present invention also intends to include these modifications and variations.

Claims

1. A control method of a heat pump system, characterized in that, the heat pump system comprises a four-way valve, a compressor, a double pipe heat exchanger, a fin heat exchanger, an electronic expansion valve, a low pressure sensor, a high pressure sensor, an ambient temperature sensor and a water temperature sensor; four joints of the four-way valve are respectively communicated with a discharge end of the compressor, a gas collecting end of the fin heat exchanger, a suction end of the compressor and an input end of the double pipe heat exchanger; a first end of the electronic expansion valve is communicated with an output end of the double pipe heat exchanger, and a second end of the electronic expansion valve is communicated with a liquid distribution end of the fin heat exchanger; the low pressure sensor is arranged in a pipeline communicating the four-way valve with the suction end of the compressor; the high pressure sensor is arranged in a pipeline communicating the four-way valve with the discharge end of the compressor; the ambient temperature sensor is arranged at a position directly contacting with an environment outside the heat pump system; and the water temperature sensor is arranged in a pipeline communicated with a water inlet end of the double pipe heat exchanger; the control method of the heat pump system comprises the following steps: obtaining a low pressure of the compressor, if the low pressure is less than a first preset pressure, obtaining a high pressure of the compressor, calculating a pressure ratio according to the high pressure and the low pressure, if the pressure ratio is greater than or equal to a first preset pressure ratio, the heat pump system enters a high pressure ratio state and performs a high pressure ratio working condition adjustment; the high pressure ratio working condition adjustment method comprises adjusting a running frequency of the compressor according to a preset frequency adjustment method and adjusting an opening degree of the electronic expansion valve according to a preset opening degree adjustment method; the preset frequency adjustment method comprises the following steps: obtaining an ambient temperature and a water inlet temperature of the double pipe heat exchanger, calculating a target frequency according to the ambient temperature and the water inlet temperature, and adjusting the running frequency of the compressor to the target frequency; The method for calculating the target frequency is: wherein is the target frequency, Ta is the ambient temperature, Ti is the inlet water temperature, and C is a constant. the preset opening degree adjustment method comprises the following steps: obtaining a real-time opening degree of the electronic expansion valve and a real-time frequency of the compressor, calculating a target opening degree according to the real-time opening degree, the real-time frequency and the pressure ratio, and adjusting the opening degree of the electronic expansion valve to the target opening degree; The method for calculating the target opening degree is: wherein is the target opening degree, Nmin is the real-time opening degree, k is the critical value of pressure ratio, K is the pressure ratio value, and F is the real-time frequency.

2. The control method of a heat pump system according to claim 1, characterized by, the priority of the high pressure ratio working condition adjustment is to adjust the running frequency of the compressor first and then adjust the opening degree of the electronic expansion valve.

3. The control method of a heat pump system according to claim 1, characterized by, the preset opening degree adjustment method further comprises the following steps: if the real-time opening degree is greater than or equal to the target opening degree, adjusting the opening degree of the electronic expansion valve to the target opening degree; if the real-time opening degree is less than the target opening degree, maintaining the opening degree of the electronic expansion valve at the current real-time opening degree.

4. The control method of a heat pump system according to claim 1, characterized by, The method of calculating the pressure ratio is where K is the pressure ratio, Ph is the high pressure, and Pl is the low pressure.

5. The control method of a heat pump system according to claim 1, characterized by, the control method further comprises the following steps: when the heat pump system is in the high pressure ratio state, performing the high pressure ratio working condition adjustment according to a preset adjustment period, the preset adjustment period is calculated according to a change rate of the high pressure, and the calculation method of the preset adjustment period T is T = 100 (Ph2-Ph1) + 90, wherein Ph1 is an initial high pressure and Ph2 is the high pressure after an interval of 1 min.

6. A computer device for heat pump system control, adapted to the control method of the heat pump system as claimed in any one of claims 1 to 5, characterized in that, the control method comprises: a signal acquisition module for acquiring the low pressure, the high pressure, the ambient temperature, the water inlet temperature, the real-time frequency and the real-time opening degree. A judging module is configured to judge whether the low-pressure pressure is less than a preset pressure and whether the pressure ratio is not less than a first preset pressure ratio; An executing module is configured to calculate a pressure ratio according to the high-pressure pressure and the low-pressure pressure when the low-pressure pressure is less than the first preset pressure, and to make the heat pump system enter a high-pressure ratio state and perform high-pressure ratio working condition adjustment when the pressure ratio is greater than or equal to the first preset pressure ratio.

7. A heat pump system, characterized by, The heat pump system comprises: at least one memory and at least one processor; The memory is configured to store one or more computer programs, which are executed by the processor to implement the steps of the control method of the heat pump system according to any one of claims 1-5; When the one or more computer programs are executed by the at least one processor, the at least one processor implements the steps of the control method of the heat pump system according to any one of claims 1-5.

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