Control method, control device, heat pump unit and computer readable storage medium

Abstract

The present disclosure provides a control method, a control device, a heat pump unit and a computer readable storage medium. The heat pump unit comprises a water-side heat exchanger, an air-side heat exchanger and a throttling element. The control method comprises: obtaining an ambient temperature, an operating mode of the heat pump unit, an outlet water temperature of the water-side heat exchanger, an inlet pipe temperature of the air-side heat exchanger and a suction temperature of the air-side heat exchanger, wherein the operating mode comprises a heating mode and a hot water mode, the hot water mode comprises a boiling sub-mode and a heat preservation sub-mode; and in the case that the ambient temperature is less than a first temperature threshold, if the heat pump unit is in the heating mode or the heat preservation sub-mode, the heat pump unit is controlled to perform a frost inhibition operation according to the inlet pipe temperature and the suction temperature after it is determined that the outlet water temperature is less than or equal to a second temperature threshold, or it is determined that the outlet water temperature is greater than the second temperature threshold and a duration of continuous operation of the heat pump unit reaches a first time threshold. The present disclosure can achieve the purpose of inhibiting or delaying the frost of the heat pump unit.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of heat pump unit, and in particular, to a control method and device for a heat pump unit, a heat pump unit and a computer readable storage medium. BACKGROUND

[0002] In the related art, a heat pump unit is prone to frosting under the condition of low ambient temperature and high humidity, but in actual application, the unit operates under such harsh conditions for a long time. Once the unit is frosted, defrosting is needed by reversing the four-way valve, which will result in loss of unit heating capacity and reduction of heating capacity and energy efficiency. SUMMARY

[0003] One technical problem solved by the present disclosure is that in the related art, a heat pump unit is prone to frosting under the condition of low ambient temperature and high humidity.

[0004] According to one aspect of the present disclosure, a control method for a heat pump unit is provided, wherein the heat pump unit comprises a water-side heat exchanger, an air-side heat exchanger and a throttling element, the control method comprising: obtaining an ambient temperature, an operating mode of the heat pump unit, an outlet water temperature of the water-side heat exchanger, an inlet pipe temperature of the air-side heat exchanger and a suction temperature of the air-side heat exchanger, wherein the operating mode comprises a heating mode and a hot water mode, and the hot water mode comprises a boiling water sub-mode and a heat preservation sub-mode; and in the case that the ambient temperature is less than a first temperature threshold, if the heat pump unit is in the heating mode or the heat preservation sub-mode, determining whether the outlet water temperature is less than or equal to a second temperature threshold, or determining whether the outlet water temperature is greater than the second temperature threshold and a duration of continuous operation of the heat pump unit reaches a first duration threshold, and controlling the heat pump unit to perform a frosting inhibition operation according to the inlet pipe temperature and the suction temperature.

[0005] In some embodiments, the control method further comprises: in the case that the ambient temperature is less than the first temperature threshold, if the heat pump unit is in the boiling water sub-mode, determining whether the outlet water temperature is greater than or equal to a third temperature threshold, and controlling the heat pump unit to perform a frosting inhibition operation according to the inlet pipe temperature and the suction temperature.

[0006] In some embodiments, controlling the heat pump unit to perform a frosting inhibition operation according to the inlet pipe temperature and the suction temperature comprises: in the case that the inlet pipe temperature satisfies a first frosting condition or the suction temperature satisfies a second frosting condition, controlling the heat pump unit to perform a frosting inhibition operation.

[0007] In some embodiments, the first frosting condition comprises that the inlet pipe temperature is less than or equal to a fourth temperature threshold and lasts for a time length reaching a second time length threshold; and the second frosting condition comprises that the suction temperature is less than or equal to a fifth temperature threshold and lasts for a time length reaching a third time length threshold.

[0008] In some embodiments, the second time length threshold is equal to the third time length threshold.

[0009] In some embodiments, the controlling the heat pump unit to perform the frosting suppression operation comprises adjusting an opening degree of the throttling element and controlling a time duration of the opening degree.

[0010] In some embodiments, the adjusting the opening degree of the throttling element and the controlling the time duration of the opening degree comprises: alternately performing the following two operations until the inlet pipe temperature is greater than the fourth temperature threshold and the suction temperature is greater than the fifth temperature threshold: adjusting the opening degree of the throttling element to a first preset opening degree and controlling the first preset opening degree for a first preset time length; and adjusting the opening degree of the throttling element to a second preset opening degree and controlling the second preset opening degree for a second preset time length.

[0011] In some embodiments, the second preset opening degree is not equal to the first preset opening degree.

[0012] In some embodiments, the control method further comprises: in a case where the inlet pipe temperature does not satisfy the first frosting condition and the suction temperature does not satisfy the second frosting condition, controlling the heat pump unit not to perform the frosting suppression operation.

[0013] In some embodiments, the control method further comprises: in a case where the ambient temperature is greater than or equal to the first temperature threshold, controlling the heat pump unit not to perform the frosting suppression operation.

[0014] According to another aspect of the present disclosure, there is provided a control device for a heat pump unit, wherein the heat pump unit comprises a water-side heat exchanger, an air-side heat exchanger and a throttling element, the control device comprising: an obtaining unit configured to obtain an ambient temperature, an operating mode of the heat pump unit, an outlet water temperature of the water-side heat exchanger, an inlet pipe temperature of the air-side heat exchanger and a suction temperature of the air-side heat exchanger, wherein the operating mode comprises a heating mode and a hot water mode, and the hot water mode comprises a boiling sub-mode and a holding sub-mode; and a control unit configured to, in a case that the ambient temperature is less than a first temperature threshold, if the heat pump unit is in the heating mode or the holding sub-mode, control the heat pump unit to perform a frost inhibition operation according to the inlet pipe temperature and the suction temperature after determining that the outlet water temperature is less than or equal to a second temperature threshold, or determining that the outlet water temperature is greater than the second temperature threshold and a duration of continuous operation of the heat pump unit reaches a first duration threshold.

[0015] According to another aspect of the present disclosure, there is provided a control device for a heat pump unit, comprising: a memory; and a processor coupled to the memory, the processor being configured to perform the control method as previously described based on instructions stored in the memory.

[0016] According to another aspect of the present disclosure, there is provided a heat pump unit comprising the control device as previously described.

[0017] In some embodiments, the heat pump unit further comprises: a water-side heat exchanger, an air-side heat exchanger and a throttling element; wherein the water-side heat exchanger is connected to the air-side heat exchanger through a pipeline, the throttling element is arranged between the water-side heat exchanger and the air-side heat exchanger, and the throttling element is electrically connected to the control device.

[0018] In some embodiments, the heat pump unit further comprises: a first temperature sensor configured to measure an outlet water temperature of the water-side heat exchanger and transmit the outlet water temperature to the control device; a second temperature sensor configured to measure an inlet pipe temperature of the air-side heat exchanger and transmit the inlet pipe temperature to the control device; a third temperature sensor configured to measure a suction temperature of the air-side heat exchanger and transmit the suction temperature to the control device; and a fourth temperature sensor configured to measure an ambient temperature and transmit the ambient temperature to the control device.

[0019] According to another aspect of the present disclosure, there is provided a computer-readable storage medium having computer program instructions stored thereon, the computer program instructions being executed by a processor to implement the control method as previously described.

[0020] In the control method, the ambient temperature, the operation mode of the heat pump unit, the outlet water temperature of the water-side heat exchanger, the inlet pipe temperature of the air-side heat exchanger and the suction temperature of the air-side heat exchanger are obtained, wherein the operation mode includes the heating mode and the hot water mode, and the hot water mode includes the boiling sub-mode and the insulation sub-mode; in the case that the ambient temperature is less than a first temperature threshold, if the heat pump unit is in the heating mode or the insulation sub-mode, the heat pump unit is controlled to perform the frost inhibition operation according to the inlet pipe temperature and the suction temperature after it is determined that the outlet water temperature is less than or equal to a second temperature threshold, or it is determined that the outlet water temperature is greater than the second temperature threshold and the heat pump unit has been continuously operated for a first time threshold. In the control method, different working conditions are determined, and the heat pump unit is controlled to perform the frost inhibition operation according to the inlet pipe temperature and the suction temperature in the corresponding working condition, so that the purpose of inhibiting or delaying the frost of the heat pump unit can be achieved.

[0021] Other features of the present disclosure, and their advantages, will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] The present disclosure can be more clearly understood with reference to the following detailed description in conjunction with the accompanying drawings, in which:

[0024] Figure 1 is a flow chart illustrating a control method for a heat pump unit according to some embodiments of the present disclosure;

[0025] Figure 2 is a flow chart illustrating a control method for a heat pump unit according to some other embodiments of the present disclosure;

[0026] Figure 3 is a structural block diagram of a control device for a heat pump unit according to some embodiments of the present disclosure;

[0027] Figure 4 is a structural block diagram of a control device for a heat pump unit according to some other embodiments of the present disclosure;

[0028] Figure 5 is a structural block diagram of a control device for a heat pump unit according to some other embodiments of the present disclosure;

[0029] Figure 6 is a structural schematic diagram of a heat pump unit according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present disclosure unless specifically stated otherwise.

[0031] It should be understood that the sizes of the various portions shown in the drawings are shown for illustrative purposes only and are not limiting to the scope of the present disclosure.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the disclosure and its applications or uses.

[0033] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and devices can be considered part of the specification.

[0034] In all of the examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not as a limitation. Thus, other examples of exemplary embodiments can have different values.

[0035] It should be noted that like reference numerals and letters refer to like items throughout the drawings, and once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0036] In the related art, for a heat pump unit (for example, a heat pump water heater), an annual heating performance factor (AHPF) can be calculated. The environmental temperature 2-7℃ is a low-temperature and high-humidity frosting condition, and the operating time ratios of the conventional heat pump and the low-temperature heat pump are about 11% and 20%, respectively. This condition also has a great influence on the energy efficiency calculation of the environmental temperature above 7℃ and the environmental temperature below 2℃.

[0037] The environmental temperature 7 / 6℃ (i.e., the dry-bulb temperature 7℃ and the wet-bulb temperature 6℃) is an edge condition of easy frosting, which is in the category of complete inhibition of frosting. The environmental temperature 2 / 1℃ (i.e., the dry-bulb temperature 2℃ and the wet-bulb temperature 1℃) is a defrosting condition, and the start-up frosting process adjustment can only inhibit the degree of frosting.

[0038] Table 1 is the annual heating energy consumption efficiency of the heat pump unit in the related art.

[0039] The ambient temperature 7 / 6℃ is at two extremes of frosting and non-frosting, which greatly affects the energy efficiency, and the energy efficiency at the ambient temperature 7 / 6℃ is the minimum value of the energy efficiency at the ambient temperature range 7℃ < tj ≤ 20℃ and the maximum value of the energy efficiency at the ambient temperature range 2℃ < tj ≤ 7℃, wherein tj represents the ambient temperature, the energy efficiency of the working condition affects the average level of the energy efficiency of the two ranges, and therefore the overall influence of the energy efficiency at the ambient temperature 7 / 6℃ on the AHPF accounts for about 45%.

[0040] Table 1

[0041]

[0042] In view of this, the present disclosure provides a control method for a heat pump unit in order to inhibit or delay frosting of the heat pump unit.

[0043] Figure 1 is a flow chart illustrating a control method for a heat pump unit according to some embodiments of the present disclosure. The heat pump unit includes a water-side heat exchanger, an air-side heat exchanger, and a throttling element. As shown in Figure 1 , the control method includes steps S102 to S104.

[0044] In step S102, the ambient temperature, the operating mode of the heat pump unit, the outlet water temperature of the water-side heat exchanger, the inlet pipe temperature of the air-side heat exchanger, and the suction temperature of the air-side heat exchanger are obtained. The operating mode includes a heating mode and a hot water mode. The hot water mode includes a boiling sub-mode and a heat preservation sub-mode.

[0045] The operating mode of the heat pump unit can be distinguished according to the user end. If the user end is a water tank, it is the hot water mode, and if the user end is a radiator, it is the heating mode.

[0046] For example, the operating mode of the heat pump unit can be obtained through a wire control device. The operating mode is set in the wire control device during engineering installation, and the mainboard of the heat pump unit can communicate with the wire control device to obtain these parameters.

[0047] The ambient temperature, the outlet water temperature of the water-side heat exchanger, the inlet pipe temperature of the air-side heat exchanger, and the suction temperature of the air-side heat exchanger can be obtained by respectively setting corresponding temperature sensors.

[0048] In step S104, in the case that the ambient temperature is less than a first temperature threshold, if the heat pump unit is in the heating mode or the heat preservation sub-mode, the heat pump unit is controlled to perform a frosting inhibition operation according to the inlet pipe temperature and the suction temperature after it is determined that the outlet water temperature is less than or equal to a second temperature threshold, or it is determined that the outlet water temperature is greater than the second temperature threshold and the duration of continuous operation of the heat pump unit reaches a first time threshold.

[0049] In some embodiments, the first temperature threshold has a value ranging from 0 to 8°C. The first temperature threshold is set to facilitate the determination of the working condition in which frost is likely to occur. Of course, those skilled in the art can understand that the above value range of the first temperature threshold is only exemplary, and the scope of the present disclosure is not limited to the specific value of the first temperature threshold. For example, in other embodiments, the first temperature threshold has a value ranging from 3°C to 10°C. The first temperature threshold can be set according to actual conditions.

[0050] In some embodiments, the second temperature threshold has a value ranging from 30°C to 50°C. The second temperature threshold represents the outlet water temperature in which frost is likely to occur.

[0051] The outlet water temperature of the water-side heat exchanger represents the condensing temperature, i.e., the condensing pressure. The higher the outlet water temperature, the higher the condensing pressure. The higher the condensing pressure, the higher the evaporation pressure of the air-side heat exchanger, and the higher the inlet pipe temperature and the suction temperature, which makes it less likely to occur frost. The reason for the second temperature threshold to have the above range is that frost is less likely to occur when the outlet water temperature is 50°C, and frost is more likely to occur when the outlet water temperature is 30°C, and then related to the respective unit configuration. In actual applications, the outlet water temperature in the heating mode can be no lower than 30°C, and can be as high as 55°C. Frost is less likely to occur when the water temperature is higher than 50°C.

[0052] Of course, those skilled in the art can understand that the above value range of the second temperature threshold is only exemplary, and the scope of the present disclosure is not limited to the specific value of the second temperature threshold. The second temperature threshold can be set according to actual conditions.

[0053] In some embodiments, the first time length threshold has a value ranging from 0 to 1 hour. The first time length threshold of 0 means that the subsequent process is executed immediately, and the first time length threshold of 1 hour means that the subsequent process is executed after 1 hour. The higher the water temperature, the longer the accumulated time can be.

[0054] Of course, those skilled in the art can understand that the above value range of the first time length threshold is only exemplary, and the scope of the present disclosure is not limited to the specific value of the first time length threshold. The first time length threshold can be set according to actual conditions.

[0055] In the above steps, for example, the outlet water temperature is less than or equal to the second temperature threshold, indicating that the heat pump unit currently has a risk of frosting, and then the heat pump unit can be immediately controlled to perform the frosting inhibition operation according to the inlet pipe temperature and the suction temperature. Here, "immediately" means within a predetermined time, for example, the predetermined time is a few seconds. If the outlet water temperature is greater than the second temperature threshold, the risk of frosting of the heat pump unit is relatively small. However, if the heat pump unit continues to run for a length of time reaching the first length threshold in such a case, the risk of frosting of the heat pump unit will increase. Therefore, after it is determined that the outlet water temperature is greater than the second temperature threshold and the length of time for which the heat pump unit continues to run reaches (i.e., is greater than or equal to) the first length threshold, the heat pump unit is controlled to perform the frosting inhibition operation according to the inlet pipe temperature and the suction temperature.

[0056] So far, a control method for a heat pump unit according to some embodiments of the present disclosure is provided. The control method includes: obtaining an ambient temperature, an operating mode of the heat pump unit, an outlet water temperature of a water-side heat exchanger, an inlet pipe temperature of an air-side heat exchanger, and a suction temperature of the air-side heat exchanger, wherein the operating mode includes a heating mode and a hot water mode, and the hot water mode includes a boiling water sub-mode and a heat preservation sub-mode; in a case where the ambient temperature is less than a first temperature threshold, if the heat pump unit is in the heating mode or the heat preservation sub-mode, then after it is determined that the outlet water temperature is less than or equal to a second temperature threshold, or it is determined that the outlet water temperature is greater than the second temperature threshold and a length of time for which the heat pump unit continues to run reaches a first length threshold, the heat pump unit is controlled to perform a frosting inhibition operation according to the inlet pipe temperature and the suction temperature. In the control method, different working conditions are determined, and the heat pump unit is controlled to perform the frosting inhibition operation according to the inlet pipe temperature and the suction temperature in the corresponding working condition, so as to achieve the purpose of inhibiting or delaying frosting of the heat pump unit. In this way, the heating energy efficiency and the annual heating energy consumption efficiency of the unit can be improved, and the power consumption of the user can be reduced.

[0057] In some embodiments, the control method further includes: in a case where the ambient temperature is less than the first temperature threshold, if the heat pump unit is in the boiling water sub-mode, then after it is determined that the outlet water temperature is greater than or equal to a third temperature threshold, the heat pump unit is controlled to perform the frosting inhibition operation according to the inlet pipe temperature and the suction temperature.

[0058] The third temperature threshold represents an outlet water temperature at which frosting is easy to occur. In some embodiments, the third temperature threshold has a numerical range of 20-45°C. When the heat pump unit is boiling water, both the temperature of the water tank and the outlet water temperature will increase from low to high. For example, the third temperature threshold is 30°C, and if the initial temperature of the water tank is 15°C, then during the process of boiling water by the heat pump unit, since the water temperature is low, the temperature rise rate is fast, and frosting is a time accumulation process, it may take a relatively short time to rise from 15°C to 30°C. Therefore, frosting does not need to be inhibited when the outlet water temperature is lower than 30°C, and frosting is inhibited only after the outlet water temperature rises to 30°C. Therefore, the numerical range of the third temperature threshold can facilitate accurate determination of the risk of frosting.

[0059] Of course, those skilled in the art can understand that the above numerical range of the third temperature threshold is only exemplary, and the scope of the present disclosure is not limited to the specific value of the third temperature threshold. The third temperature threshold can be set according to actual conditions.

[0060] In some embodiments, controlling the heat pump unit to perform the frost inhibition operation according to the inlet pipe temperature and the suction temperature comprises: controlling the heat pump unit to perform the frost inhibition operation in a case where the inlet pipe temperature meets a first frost condition or the suction temperature meets a second frost condition.

[0061] In the above embodiments, whether to control the heat pump unit to perform the frost inhibition operation is determined by determining whether the inlet pipe temperature meets the first frost condition or the suction temperature meets the second frost condition. In this way, the purpose of controlling the heat pump unit to perform the frost inhibition operation according to the inlet pipe temperature and the suction temperature is achieved, which can achieve the purpose of precisely inhibiting or delaying frost, thereby improving the heating energy efficiency of the unit and the annual heating energy consumption efficiency, and reducing the power consumption of the user.

[0062] In some embodiments, the first frost condition comprises: the inlet pipe temperature being less than or equal to a fourth temperature threshold and lasting a second duration threshold (i.e., greater than or equal to the second duration threshold).

[0063] The fourth temperature threshold represents the inlet pipe temperature prone to frost. In some embodiments, the numerical range of the fourth temperature threshold is -5℃ to 3℃. Such a numerical range facilitates accurate determination of whether there is a risk of frost.

[0064] Of course, those skilled in the art can understand that the above numerical range of the fourth temperature threshold is only exemplary, and the scope of the present disclosure is not limited to the specific value of the fourth temperature threshold. The fourth temperature threshold can be set according to actual conditions.

[0065] The second duration threshold represents the duration of the frost-prone parameter. In some embodiments, the numerical range of the second duration threshold is 0 to 15 min (minutes). The second duration threshold of 0 indicates that the frost inhibition control logic is entered immediately after the inlet pipe temperature is detected; and the second duration threshold of 15 min indicates that the inlet pipe temperature has been at a low temperature for a relatively long period of 15 min. Such a numerical range facilitates accurate determination of whether there is a risk of frost.

[0066] Of course, those skilled in the art can understand that the above numerical range of the second duration threshold is only exemplary, and the scope of the present disclosure is not limited to the specific value of the second duration threshold. The second duration threshold can be set according to actual conditions.

[0067] In some embodiments, the second frosting condition comprises: the suction temperature being less than or equal to a fifth temperature threshold and for a duration reaching (i.e., greater than or equal to) a third duration threshold.

[0068] The fifth temperature threshold represents a suction temperature at which frosting is likely to occur. In some embodiments, the fifth temperature threshold has a numerical range of -5°C to 3°C. Such a numerical range facilitates accurate determination of whether there is a risk of frosting.

[0069] Of course, those skilled in the art will appreciate that the above-mentioned numerical range of the fifth temperature threshold is merely exemplary, and the scope of the present disclosure is not limited to a specific value of the fifth temperature threshold. The fifth temperature threshold can be set according to actual conditions.

[0070] The third duration threshold represents a duration for which the easy-frosting parameter persists. In some embodiments, the third duration threshold has a numerical range of 0 to 15 min (minutes). The third duration threshold taking a value of 0 means that the anti-frosting control logic is entered immediately after the suction temperature is detected; the third duration threshold taking a value of 15 min means that the suction temperature has been at a low temperature for a relatively long duration of 15 min. Such a numerical range facilitates accurate determination of whether there is a risk of frosting.

[0071] Of course, those skilled in the art will appreciate that the above-mentioned numerical range of the third duration threshold is merely exemplary, and the scope of the present disclosure is not limited to a specific value of the third duration threshold. The third duration threshold can be set according to actual conditions.

[0072] In some embodiments, the second duration threshold is equal to the third duration threshold. This facilitates implementation of the control logic.

[0073] In other embodiments, the second duration threshold can also be different from the third duration threshold.

[0074] In some embodiments, controlling the heat pump unit to perform the anti-frosting operation comprises adjusting an opening degree of a throttling element and controlling a duration for which the opening degree persists. For example, the throttling element comprises an electronic expansion valve. This can achieve redistribution of the refrigerant. Since refrigerant balance requires time, the opening degree of the throttling element after adjustment is set with a duration for which the opening degree persists, so that the air-side heat exchanger gradually reaches a thermal equilibrium state.

[0075] In some embodiments, adjusting the opening degree of the throttling element and controlling the duration for which the opening degree persists comprises: alternately performing the following two operations until the inlet pipe temperature is greater than a fourth temperature threshold and the suction temperature is greater than the fifth temperature threshold: adjusting the opening degree of the throttling element to a first preset opening degree and controlling the first preset opening degree to persist for a first preset duration; and adjusting the opening degree of the throttling element to a second preset opening degree and controlling the second preset opening degree to persist for a second preset duration.

[0076] In other words, adjusting the opening degree of the throttling element and controlling the duration of the opening degree comprises: alternately performing steps (a) and (b) until the pipe-in temperature is greater than the fourth temperature threshold and the suction temperature is greater than the fifth temperature threshold.

[0077] In step (a), the opening degree of the throttling element is adjusted to a first preset opening degree, and the first preset opening degree is controlled for a first preset time length.

[0078] In the embodiment of the present disclosure, the step number of the throttling element is the opening degree of the throttling element. Therefore, the first preset opening degree can be represented by a first preset step number.

[0079] In some embodiments, the first preset opening degree (i.e. the first preset step number) ranges from 100 pls to 400 pls. pls is the unit of the opening degree of the electronic expansion valve, which can be understood as the step number of the electronic expansion valve. The range of the first preset opening degree can facilitate the purpose of delaying or inhibiting frosting.

[0080] Of course, those skilled in the art can understand that the above range of the first preset opening degree is only exemplary, and the scope of the present disclosure is not limited to the specific value of the first preset opening degree. The first preset opening degree can be set according to actual conditions.

[0081] In some embodiments, the first preset time length t1 ranges from 0 to 15 min. The range of the first preset time length can facilitate the purpose of delaying or inhibiting frosting.

[0082] Of course, those skilled in the art can understand that the above range of the first preset time length is only exemplary, and the scope of the present disclosure is not limited to the specific value of the first preset time length. The first preset time length can be set according to actual conditions.

[0083] In step (b), the opening degree of the throttling element is adjusted to a second preset opening degree, and the second preset opening degree is controlled for a second preset time length.

[0084] The second preset opening degree can be represented by a second preset step number.

[0085] The second preset opening degree is not equal to the first preset opening degree. For example, the second preset opening degree is less than the first preset opening degree. For another example, the second preset opening degree is greater than the first preset opening degree. The second preset opening degree can be set according to actual conditions. In this embodiment, the second preset opening degree is not equal to the first preset opening degree, so that the opening degree of the throttling element can be adjusted to different preset opening degrees, thereby corresponding to different preset opening degrees, achieving different pipe-in temperatures and different suction temperatures. In this way, by adjusting the pipe-in temperature and the suction temperature of the air-side heat exchanger (as an evaporator), the air-side heat exchanger is alternately preheated, so that the air-side heat exchanger is in a thermal equilibrium state.

[0086] In some embodiments, the second preset time length t2 is in the range of 0 < t2≤ 15 min. This range of the second preset time length can facilitate the purpose of delaying or inhibiting frosting.

[0087] Of course, those skilled in the art can understand that the above range of the second preset time length is only exemplary, and the scope of the present disclosure is not limited to the specific value of the second preset time length. The second preset time length can be set according to actual conditions.

[0088] Steps (a) and (b) are alternately performed until the inlet pipe temperature is greater than the fourth temperature threshold and the suction temperature is greater than the fifth temperature threshold.

[0089] In the above embodiments, the redistribution of the refrigerant can be achieved by alternately adjusting the opening degree of the throttling element to the first preset opening degree and the second preset opening degree different from the first preset opening degree, respectively. In addition, since the refrigerant balance needs time, the first preset time length is set for the first preset opening degree, and the second preset time length is set for the second preset opening degree. The above method can adjust the inlet pipe temperature and the suction temperature. When the opening degree (i.e., the number of steps) of the throttling element is small, the inlet pipe temperature is low and the suction temperature is high. When the opening degree of the throttling element is large, the inlet pipe temperature is high and the suction temperature is low. By adjusting the inlet pipe temperature and the suction temperature of the air side heat exchanger (as an evaporator), the alternate preheating is achieved, and the air side heat exchanger is in a thermal equilibrium state.

[0090] In some embodiments, the control method further comprises: in the case that the inlet pipe temperature does not satisfy the first frosting condition and the suction temperature does not satisfy the second frosting condition, controlling the heat pump unit not to perform the frosting inhibition operation. That is, if the inlet pipe temperature does not satisfy the first frosting condition and the suction temperature does not satisfy the second frosting condition, the original control is kept unchanged. In this way, in the case that the inlet pipe temperature does not satisfy the first frosting condition and the suction temperature does not satisfy the second frosting condition, the original control logic of the unit is not affected, so that the unit can perform normal processes.

[0091] In some embodiments, the control method further comprises: in the case that the ambient temperature is greater than or equal to the first temperature threshold, controlling the heat pump unit not to perform the frosting inhibition operation. That is, when the ambient temperature is greater than or equal to the first temperature threshold, regardless of the conditions of other temperatures, the unit will not enter the frosting inhibition control logic. In this way, in the case that the ambient temperature is greater than or equal to the first temperature threshold, the original control logic of the unit is not affected, so that the unit can perform normal processes.

[0092] Figure 2 is a flow chart showing a control method for a heat pump unit according to some other embodiments of the present disclosure. As shown in Figure 2 , the control method comprises steps S202 to S224.

[0093] At step S202, the ambient temperature, the operation mode of the heat pump unit, the outlet water temperature of the water side heat exchanger, the inlet pipe temperature of the air side heat exchanger and the suction temperature of the air side heat exchanger are obtained. The operation mode includes the heating mode and the hot water mode. The hot water mode includes the boiling sub-mode and the insulation sub-mode.

[0094] At step S204, it is judged whether the ambient temperature is less than a first temperature threshold. If yes, the process enters step S206 or S220, i.e. enters the corresponding subsequent process according to different operation modes, and enters the frost inhibition control logic judgment; otherwise, the process enters step S208.

[0095] At step S206, the operation mode is the heating mode. That is, the heat pump unit is in the heating mode. The operation mode is the heating mode, which means that the heat pump unit will be stably operated at an outlet water temperature for a long time.

[0096] At step S208, the frost inhibition logic is exited, and the original normal control is kept.

[0097] At step S210, it is judged whether the outlet water temperature is less than or equal to a second temperature threshold. If yes, the process enters step S212; otherwise, i.e. the outlet water temperature is greater than the second temperature threshold, the process enters step S214.

[0098] At step S212, it is judged whether the inlet pipe temperature meets a first frost condition or whether the suction temperature meets a second frost condition. For example, it can be immediately judged whether the inlet pipe temperature meets the condition that the inlet pipe temperature is less than or equal to a fourth temperature threshold and the duration reaches a second duration threshold, or whether the suction temperature meets the condition that the suction temperature is less than or equal to a fifth temperature threshold and the duration reaches a third duration threshold. If yes, it means that the unit is about to frost or has frosted, and the process enters step S216; otherwise, the process returns to step S208, i.e. the original control is kept unchanged.

[0099] At step S214, after the duration of the continuous operation of the heat pump unit reaches a first duration threshold, it is judged whether the inlet pipe temperature meets the first frost condition or whether the suction temperature meets the second frost condition. For example, after it is determined that the outlet water temperature is greater than the second temperature threshold and the duration of the continuous operation of the heat pump unit reaches the first duration threshold, it is judged whether the inlet pipe temperature meets the condition that the inlet pipe temperature is less than or equal to the fourth temperature threshold and the duration reaches the second duration threshold, or whether the suction temperature meets the condition that the suction temperature is less than or equal to the fifth temperature threshold and the duration reaches the third duration threshold. If yes, it means that the unit is about to frost or has frosted, and the process enters step S216; otherwise, the process returns to step S208, i.e. the original control is kept unchanged.

[0100] At step S216, the opening degree of the throttling element is adjusted to a first preset opening degree for a first preset time duration, and then the opening degree of the throttling element is adjusted to a second preset opening degree for a second preset time duration, and so on.

[0101] At step S218, it is determined whether the inlet pipe temperature is greater than a fourth temperature threshold and the suction temperature is greater than a fifth temperature threshold. If yes, the process proceeds to step S208; otherwise, the process returns to S216. That is, through the operation of step S216, until the inlet pipe temperature is greater than the fourth temperature threshold and the suction temperature is greater than the fifth temperature threshold, the frost suppression control logic is exited, and the original control is resumed.

[0102] At step S220, the operation mode is a hot water mode. That is, the heat pump unit is in the hot water mode. The operation mode is the hot water mode, which means that the heat pump unit is in the water outlet temperature constantly changing temperature if boiling water, and is in the water outlet temperature changing less if keeping the water tank warm.

[0103] At step S222, it is determined whether the unit is boiling water. If yes, it means that the heat pump unit is in the boiling water sub-mode, and the process proceeds to step S224; otherwise, it means that the heat pump unit is in the warm keeping sub-mode, and the process proceeds to step S210. When the unit is in the cycle warm keeping (i.e. in the warm keeping sub-mode), the heat pump unit adopts the same control logic as in the heating mode.

[0104] At step S224, it is determined whether the water outlet temperature is greater than or equal to a third temperature threshold. If yes, the process proceeds to step S212, i.e. the subsequent frost suppression operation of the heat pump unit is controlled according to the inlet pipe temperature and the suction temperature; otherwise, the process returns to step S208, i.e. the original control is kept unchanged. For example, if the water outlet temperature is greater than or equal to the third temperature threshold, step S212 is immediately executed. Here, the meaning of "immediately" is the same as the meaning of "immediately" described above.

[0105] So far, the control method for the heat pump unit according to some embodiments of the present disclosure has been described. In the control method, the opening degree of the throttling element and the opening degree maintenance time are controlled according to the operation mode, the ambient temperature, the water outlet temperature, the inlet pipe temperature and the suction temperature, so as to achieve the purpose of precisely suppressing or delaying the frost, thereby improving the heating energy efficiency of the unit and the annual heating energy consumption efficiency, and reducing the power consumption of the user.

[0106] Figure 3 is a structural block diagram showing a control device for a heat pump unit according to some embodiments of the present disclosure. The heat pump unit includes a water-side heat exchanger, an air-side heat exchanger and a throttling element. The control device includes an obtaining unit 310 and a control unit 320.

[0107] The obtaining unit 310 is configured to obtain an ambient temperature, an operation mode of the heat pump unit, an outlet water temperature of the water-side heat exchanger, an inlet pipe temperature of the air-side heat exchanger, and a suction temperature of the air-side heat exchanger. The operation mode includes a heating mode and a hot water mode, and the hot water mode includes a boiling sub-mode and a heat preservation sub-mode.

[0108] The control unit 320 is configured to, in a case where the ambient temperature is less than a first temperature threshold, if the heat pump unit is in the heating mode or the heat preservation sub-mode, control the heat pump unit to perform the frost inhibition operation according to the inlet pipe temperature and the suction temperature after determining that the outlet water temperature is less than or equal to a second temperature threshold, or determining that the outlet water temperature is greater than the second temperature threshold and a duration of continuous operation of the heat pump unit reaches a first duration threshold.

[0109] So far, the control device for the heat pump unit according to some embodiments of the present disclosure is provided. In the control device, by determining different working conditions, the heat pump unit is controlled to perform the frost inhibition operation according to the inlet pipe temperature and the suction temperature in the corresponding working condition, so as to achieve the purpose of inhibiting or delaying the frost of the heat pump unit. In this way, the heating energy efficiency of the unit and the annual heating energy consumption efficiency can be improved, and the power consumption of the user can be reduced.

[0110] In some embodiments, the control unit 320 is further configured to, in a case where the ambient temperature is less than the first temperature threshold, if the heat pump unit is in the boiling sub-mode, control the heat pump unit to perform the frost inhibition operation according to the inlet pipe temperature and the suction temperature after determining that the outlet water temperature is greater than or equal to a third temperature threshold.

[0111] In some embodiments, the control unit 320 is configured to control the heat pump unit to perform the frost inhibition operation in a case where the inlet pipe temperature satisfies a first frost condition or the suction temperature satisfies a second frost condition.

[0112] In some embodiments, the first frost condition includes that the inlet pipe temperature is less than or equal to a fourth temperature threshold and a duration reaches a second duration threshold.

[0113] In some embodiments, the second frost condition includes that the suction temperature is less than or equal to a fifth temperature threshold and a duration reaches a third duration threshold.

[0114] In some embodiments, the second duration threshold is equal to the third duration threshold.

[0115] In some embodiments, the control unit 320 is configured to adjust the opening degree of the throttling element and control the time duration of the opening degree.

[0116] In some embodiments, the control unit 320 is configured to alternately perform the following two operations until the inlet pipe temperature is greater than the fourth temperature threshold and the suction temperature is greater than the fifth temperature threshold: adjusting the opening degree of the throttling element to a first preset opening degree and controlling the first preset opening degree for a first preset time length; and adjusting the opening degree of the throttling element to a second preset opening degree and controlling the second preset opening degree for a second preset time length.

[0117] In some embodiments, the second preset opening degree is not equal to the first preset opening degree.

[0118] In some embodiments, the control unit 320 is further configured to control the heat pump unit not to perform the frost inhibition operation when the inlet pipe temperature does not satisfy the first frost condition and the suction temperature does not satisfy the second frost condition.

[0119] In some embodiments, the control unit 320 is further configured to control the heat pump unit not to perform the frost inhibition operation when the ambient temperature is greater than or equal to the first temperature threshold.

[0120] In some embodiments, the throttling element comprises an electronic expansion valve.

[0121] Figure 4 is a structural block diagram showing a control device for a heat pump unit according to some other embodiments of the present disclosure. The control device comprises a memory 410 and a processor 420. Wherein:

[0122] The memory 410 can be a magnetic disk, a flash memory or any other non-volatile storage medium. The memory is configured to store Figure 1 and / or Figure 2 instructions in the corresponding embodiments.

[0123] The processor 420 is coupled to the memory 410 and can be implemented as one or more integrated circuits, such as a microprocessor or a microcontroller. The processor 420 is configured to execute the instructions stored in the memory by determining different working conditions, so as to control the heat pump unit to perform the frost inhibition operation according to the inlet pipe temperature and the suction temperature in the corresponding working conditions, so as to inhibit or delay the frost of the heat pump unit.

[0124] In some embodiments, the control device 500 can also be as shown in Figure 5 The control device 500 comprises a memory 510 and a processor 520. The processor 520 is coupled to the memory 510 through a BUS 530. The control device 500 can also be connected to an external storage device 550 through a storage interface 540 to call external data, and can also be connected to a network or another computer system (not shown) through a network interface 560, which will not be described in detail here.

[0125] In the embodiment, the data instruction is stored by the memory, and the processor processes the instruction, determines different working conditions, and controls the heat pump unit to perform the frost inhibition operation according to the suction temperature and the suction temperature in the corresponding working condition, so that the frost of the heat pump unit can be inhibited or delayed.

[0126] In some embodiments of the present disclosure, a heat pump unit is also provided. The heat pump unit comprises a control device (for example, the control device shown in Figure 3 , Figure 4 or Figure 5 ).

[0127] Figure 6 is a structural schematic diagram of a heat pump unit according to some embodiments of the present disclosure.

[0128] As shown in Figure 6 , the heat pump unit (which can also be referred to as a heat pump system) comprises a control device 600. For example, the control device 600 is a control device shown in Figure 3 , Figure 4 or Figure 5 .

[0129] In some embodiments, as shown in Figure 6 , the heat pump unit further comprises a water-side heat exchanger 5, an air-side heat exchanger 11 and a throttling element 7. For example, the air-side heat exchanger 11 comprises a fin heat exchanger. For example, the throttling element 7 comprises an electronic expansion valve.

[0130] As shown in Figure 6 , the water-side heat exchanger 5 is connected to the air-side heat exchanger 11 through a pipeline. The throttling element 7 is arranged between the water-side heat exchanger 5 and the air-side heat exchanger 11. The throttling element 7 is electrically connected to the control device 600.

[0131] In some embodiments, as shown in Figure 6 , the heat pump unit further comprises a first temperature sensor 18. The first temperature sensor 18 is electrically connected to the control device 600. The first temperature sensor 18 is arranged at the water outlet end of the water-side heat exchanger 5. The first temperature sensor 18 is used to measure the water outlet temperature of the water-side heat exchanger 5 and transmit the water outlet temperature to the control device 600. For example, the first temperature sensor comprises a water outlet temperature sensing bag.

[0132] In some embodiments, as shown in Figure 6 , the heat pump unit further comprises a second temperature sensor 9. The second temperature sensor 9 is electrically connected to the control device 600. The second temperature sensor 9 is arranged at the first end (for example, the suction pipe end) of the air-side heat exchanger. The second temperature sensor 9 is used to measure the suction temperature of the air-side heat exchanger 11 and transmit the suction temperature to the control device 600. For example, the second temperature sensor 9 comprises a suction temperature sensing bag.

[0133] In some embodiments, such as Figure 6 As shown, the heat pump unit also includes a third temperature sensor 10. The third temperature sensor 10 is electrically connected to the control device 600. The third temperature sensor 10 is located at the second end (e.g., the suction end) of the air-side heat exchanger. The third temperature sensor 10 is used to measure the suction temperature of the air-side heat exchanger 11 and transmit the suction temperature to the control device 600. For example, the third temperature sensor 10 includes a suction temperature sensing element.

[0134] In some embodiments, such as Figure 6 As shown, the heat pump unit also includes a fourth temperature sensor 12. The fourth temperature sensor 12 is electrically connected to the control unit 600. The fourth temperature sensor 12 can be located near the air-side heat exchanger 11. The fourth temperature sensor 12 is used to measure the ambient temperature and transmit this ambient temperature to the control unit 600. For example, the fourth temperature sensor 12 includes an ambient temperature sensing element.

[0135] In some embodiments, such as Figure 6 As shown, the heat pump unit also includes: a compressor 1, a high-pressure switch 2, a four-way valve 4, a vapor-liquid separator 14, and a low-pressure switch 15. The compressor 1, the four-way valve 4, and the vapor-liquid separator 14 are connected by pipelines. The four-way valve 4 is also connected to the water-side heat exchanger 5 and the air-side heat exchanger 11 via pipelines. The high-pressure switch 2 is located on the first side of the compressor 1, and the low-pressure switch 15 is located on the second side of the compressor 1, opposite to the first side. The high-pressure switch 2 is located between the compressor 1 and the four-way valve 4. The low-pressure switch 15 is located between the compressor 1 and the vapor-liquid separator 14.

[0136] In some embodiments, such as Figure 6 As shown, the heat pump unit also includes a fifth temperature sensor 3. This fifth temperature sensor 3 is electrically connected to the control unit 600. The fifth temperature sensor 3 is located between the high-pressure switch 2 and the four-way valve 4. This fifth temperature sensor measures the compressor's exhaust temperature and transmits this exhaust temperature to the control unit 600. For example, the fifth temperature sensor 3 includes an exhaust temperature sensing bulb.

[0137] In some embodiments, such as Figure 6 As shown, the heat pump unit also includes a sixth temperature sensor 13. This sixth temperature sensor 13 is electrically connected to the control unit 600. The sixth temperature sensor 13 is disposed between the vapor-liquid separator 14 and the four-way valve 4. The sixth temperature sensor 13 is used to measure the suction temperature of the compressor and transmit this suction temperature to the control unit 600. For example, the sixth temperature sensor 13 includes a suction temperature sensing element.

[0138] In some embodiments, such as Figure 6As shown, the heat pump unit further comprises a first filter 6 and a second filter 8. The first filter 6 is arranged between the throttling element 7 and the water-side heat exchanger 5. The second filter 8 is arranged between the throttling element 7 and the air-side heat exchanger 11.

[0139] In some embodiments, as shown in FIG. 1, the heat pump unit further comprises a seventh temperature sensor 17. The seventh temperature sensor 17 is electrically connected to the control device 600. The seventh temperature sensor 17 is arranged at the water inlet end of the water-side heat exchanger 5. The seventh temperature sensor 17 is configured to measure the water inlet temperature of the water-side heat exchanger 5 and transmit the water inlet temperature to the control device 600. For example, the seventh temperature sensor 17 comprises a water inlet temperature sensing bulb. Figure 6

[0140] In addition, as shown in FIG. 1, the heat pump unit further comprises a user end device 20. Figure 6

[0141] In some embodiments, as shown in FIG. 1, the heat pump unit further comprises a circulating water pump 16 and a water flow switch 19. The circulating water pump 16 is arranged at the water inlet end of the water-side heat exchanger 5. The circulating water pump 16 is arranged between the user end device 20 and the seventh temperature sensor 17. The water flow switch 19 is arranged at the water outlet end of the water-side heat exchanger 5. The water flow switch 19 is arranged between the user end device 20 and the first temperature sensor 18. Figure 6

[0142] So far, the heat pump unit according to some embodiments of the present disclosure has been described.

[0143] In some embodiments, the present disclosure further provides a computer readable storage medium (for example, a non-transitory computer readable storage medium) having computer program instructions stored thereon, which, when executed by a processor, implement the steps of the method in the corresponding embodiments. Those skilled in the art should understand that the embodiments of the present disclosure can be provided as a method, device, or computer program product. Therefore, the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present disclosure can take the form of a computer program product implemented on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) containing computer-usable program code. Figure 1 and / or Figure 2 The steps of the method in the corresponding embodiments. Those skilled in the art should understand that the embodiments of the present disclosure can be provided as a method, device, or computer program product. Therefore, the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present disclosure can take the form of a computer program product implemented on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) containing computer-usable program code.

[0144] ​​​The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0145] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0146] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0147] So far, the present disclosure has been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0148] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A control method for a heat pump unit, wherein, The heat pump unit includes a water-side heat exchanger, an air-side heat exchanger, and a throttling element; the control method includes: The ambient temperature, the operating mode of the heat pump unit, the outlet water temperature of the water-side heat exchanger, the inlet pipe temperature of the air-side heat exchanger, and the suction air temperature of the air-side heat exchanger are obtained. The operating mode includes a heating mode and a hot water mode, and the hot water mode includes a water heating sub-mode and a heat preservation sub-mode. If the ambient temperature is less than a first temperature threshold, and the heat pump unit is in the heating mode or the insulation sub-mode, then after determining that the outlet water temperature is less than or equal to a second temperature threshold, or determining that the outlet water temperature is greater than the second temperature threshold and the heat pump unit has been running continuously for a duration reaching a first duration threshold, the heat pump unit is controlled to perform an anti-frost operation based on the inlet pipe temperature and the suction temperature; and If the ambient temperature is less than the first temperature threshold, and the heat pump unit is in the water heating sub-mode, then after determining that the outlet water temperature is greater than or equal to the third temperature threshold, the heat pump unit is controlled to perform an anti-frost operation based on the inlet pipe temperature and the suction temperature.

2. The control method according to claim 1, wherein, Controlling the heat pump unit to perform anti-frost operation based on the inlet pipe temperature and the suction temperature includes: If the inlet pipe temperature meets the first frosting condition, or the suction temperature meets the second frosting condition, the heat pump unit is controlled to perform a frosting suppression operation.

3. The control method according to claim 2, wherein: The first frosting condition includes: the inlet pipe temperature is less than or equal to a fourth temperature threshold and the duration reaches a second duration threshold; The second frosting condition includes: the intake temperature is less than or equal to the fifth temperature threshold and the duration reaches the third duration threshold.

4. The control method according to claim 3, wherein, The second duration threshold is equal to the third duration threshold.

5. The control method according to claim 3, wherein, Controlling the heat pump unit to perform anti-frost operation includes: adjusting the opening degree of the throttling element and controlling the duration of the opening degree.

6. The control method according to claim 5, wherein, Adjusting the opening degree of the throttling element and controlling the duration of the opening degree includes: alternately performing the following two operations until the inlet pipe temperature is greater than the fourth temperature threshold and the intake temperature is greater than the fifth temperature threshold: The opening degree of the throttling element is adjusted to a first preset opening degree, and the first preset opening degree is maintained for a first preset duration; and The opening degree of the throttling element is adjusted to a second preset opening degree, and the second preset opening degree is controlled to last for a second preset duration.

7. The control method according to claim 6, wherein, The second preset opening is not equal to the first preset opening.

8. The control method according to claim 2, further comprising: If the inlet pipe temperature does not meet the first frosting condition and the suction temperature does not meet the second frosting condition, the heat pump unit is controlled not to perform the frosting suppression operation.

9. The control method according to claim 1, further comprising: When the ambient temperature is greater than or equal to the first temperature threshold, the heat pump unit is controlled not to perform the anti-frost operation.

10. A control device for a heat pump unit, wherein, The heat pump unit includes a water-side heat exchanger, an air-side heat exchanger, and a throttling element; the control device includes: The acquisition unit is used to acquire ambient temperature, the operating mode of the heat pump unit, the outlet water temperature of the water-side heat exchanger, the inlet pipe temperature of the air-side heat exchanger, and the suction air temperature of the air-side heat exchanger, wherein the operating mode includes a heating mode and a hot water mode, and the hot water mode includes a boiling sub-mode and a heat preservation sub-mode; and The control unit is configured to, when the ambient temperature is less than a first temperature threshold, if the heat pump unit is in the heating mode or the insulation sub-mode, after determining that the outlet water temperature is less than or equal to a second temperature threshold, or after determining that the outlet water temperature is greater than the second temperature threshold and the duration of continuous operation of the heat pump unit reaches a first duration threshold, control the heat pump unit to perform an anti-frost operation based on the inlet pipe temperature and the suction temperature. The control unit is further configured to, when the ambient temperature is less than the first temperature threshold, if the heat pump unit is in the water heating sub-mode, and after determining that the outlet water temperature is greater than or equal to the third temperature threshold, control the heat pump unit to perform an anti-frost operation based on the inlet pipe temperature and the suction temperature.

11. A control device for a heat pump unit, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the control method as described in any one of claims 1 to 9 based on instructions stored in the memory.

12. A heat pump unit, comprising: The control device as described in claim 10 or 11.

13. The heat pump unit according to claim 12, further comprising: Water-side heat exchanger, air-side heat exchanger, and throttling element; The water-side heat exchanger and the air-side heat exchanger are connected by a pipeline, and the throttling element is disposed between the water-side heat exchanger and the air-side heat exchanger. The throttling element is electrically connected to the control device.

14. The heat pump unit according to claim 13, further comprising: The first temperature sensor is used to measure the outlet water temperature of the water-side heat exchanger and transmit the outlet water temperature to the control device. The second temperature sensor is used to measure the inlet pipe temperature of the air-side heat exchanger and transmit the inlet pipe temperature to the control device. The third temperature sensor is used to measure the suction temperature of the air-side heat exchanger and transmit the suction temperature to the control device. and A fourth temperature sensor is used to measure the ambient temperature and transmit the ambient temperature to the control device.

15. A computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the control method as described in any one of claims 1 to 9.

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