Air source heat pump unit and control method thereof

Abstract

The invention relates to the technical field of heat pumps, in particular to an air source heat pump unit and a control method of the air source heat pump unit, the air source heat pump unit comprises a unit body, the unit body comprises a first heat exchanger, and a heat absorption channel of the first heat exchanger is provided with a first bypass port and a second bypass port; the circulating heating device comprises a second heat exchanger, a water outlet pipe and a water return pipe, the first bypass opening communicates with an inlet of a heat absorption channel of the second heat exchanger through the water outlet pipe, and an outlet of the heat absorption channel of the second heat exchanger communicates with the second bypass opening through the water return pipe. The circulating heating device serves as an external device of the unit body, it can be guaranteed that an internal water system can be subjected to temperature rise protection in time under the condition that the unit body stops, the unit body is protected against damage caused by freezing of the water system under the extreme condition, anti-freezing operation does not need to be conducted on the unit body under the specific starting condition, and temperature rise anti-freezing is conducted on the water system; the reliability of the air source heat pump unit is enhanced, and user loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to an air source heat pump unit and a control method thereof. Background Art

[0002] With the expansion of the application scenarios of air source heat pump units, the application of air source heat pump units in low-temperature scenarios is becoming more and more extensive. However, the freezing problem of the water system in low-temperature scenarios follows. Generally, the unit will be built-in with an anti-freezing program. In a low-temperature environment, the water pump or the unit water pump will run simultaneously to ensure that the water temperature of the unit is higher than the freezing temperature and will not cause freezing and cracking problems. However, the above unit anti-freezing is based on the premise that the unit and the corresponding water system can be powered on and run normally. In the case where the unit cannot be powered on, the existing anti-freezing program cannot run, which will cause the unit water system and the unit heat exchanger to be damaged due to freezing, resulting in greater economic losses. Summary of the Invention

[0003] The present invention provides an air source heat pump unit and a control method thereof to solve one of the defects in the prior art. The circulating heating device, as an external device of the unit body, can ensure that the internal water system of the unit body can also be heated and protected in time when the unit body is shut down, protecting the unit body from being damaged due to freezing of the water system under extreme conditions, and eliminating the need for the unit body to perform anti-freezing operations under specific startup conditions to heat and prevent freezing of the water system, enhancing the reliability of the air source heat pump unit and reducing user losses.

[0004] The present invention provides an air source heat pump unit, comprising: A unit body, the unit body includes a first heat exchanger, and a first bypass port and a second bypass port are provided on the heat absorption path of the first heat exchanger; A circulating heating device, the circulating heating device includes a second heat exchanger, a water outlet pipe and a water return pipe. The first bypass port is communicated with the inlet of the heat absorption path of the second heat exchanger through the water outlet pipe, and the outlet of the heat absorption path of the second heat exchanger is communicated with the second bypass port through the water return pipe.

[0005] According to the air source heat pump unit provided by the present invention, a third bypass port is further provided on the heat release path of the first heat exchanger, and the circulating heating device further includes a first intake pipe. The third bypass port is communicated with the first inlet of the heat release path of the second heat exchanger through the first intake pipe.

[0006] According to the air source heat pump unit provided by the present invention, the unit body further includes a compressor, and the compressor is provided with a fourth bypass port and a second intake pipe. The fourth bypass port is communicated with the second inlet of the heat release path of the second heat exchanger through the second intake pipe.

[0007] An air source heat pump unit provided according to the present invention, a drain pipe is further provided in the heat absorption passage of the first heat exchanger.

[0008] An air source heat pump unit provided according to the present invention, the circulating heating device further includes a temperature sensor, the temperature sensor is disposed in the first heat exchanger and is adapted to detect the water temperature in the first heat exchanger.

[0009] An air source heat pump unit provided according to the present invention, the circulating heating device further includes a water pump, the water pump is disposed on the outlet pipe.

[0010] An air source heat pump unit provided according to the present invention, the circulating heating device further includes a first valve body, the first valve body is disposed on the return pipe.

[0011] An air source heat pump unit provided according to the present invention, the circulating heating device further includes a second valve body and a third valve body, the second valve body is disposed on the second intake pipe, and the third valve body is disposed on the drain pipe.

[0012] An air source heat pump unit provided according to the present invention, the circulating heating device further includes an auxiliary power supply, and the auxiliary power supply is electrically connected to the first valve body, the second valve body, and the third valve body respectively.

[0013] The present invention also provides a control method for an air source heat pump unit, which is applied to the air source heat pump unit as described above, and includes: Determine that the ambient temperature is less than 0°C, and determine that the water temperature in the heat absorption passage of the first heat exchanger is at a first set temperature and the unit power supply of the air source heat pump unit is not turned on, send a freezing warning message and report a freezing failure; Or, determine that the ambient temperature is less than 0°C, and determine that the water temperature in the heat absorption passage of the first heat exchanger continuously drops to a second set temperature, send a freezing notice and control the first valve body to open; Or, determine that the ambient temperature is less than 0°C, and when it is determined that the water temperature in the heat absorption passage of the first heat exchanger continuously drops to a third set temperature, control the third valve body to open; Wherein, the second set temperature is less than the first set temperature and greater than the third set temperature, and the third set temperature is greater than or equal to 0°C.

[0014] The air source heat pump unit of the embodiment of the present invention mainly consists of various devices of the unit body and the newly added circulating heating device. The unit body is an integration of the devices that operate when a conventional air source heat pump unit is working normally, and the circulating heating device is an integration of the devices that operate when the unit body is powered off.

[0015] As part of the unit body, water flows into the heat absorption passage inside the first heat exchanger, and high-temperature air flows through the heat release passage. After the water and air exchange heat, the water is heated and flows out of the first heat exchanger, thus realizing the function of the heat pump unit to supply heat to users.

[0016] The heat absorption passage of the first heat exchanger is also provided with a first bypass port and a second bypass port. The second heat exchanger of the circulating heating device is connected to the first bypass port and the second bypass port respectively through an outlet pipe and a return pipe, thereby forming a loop for the water in the first heat exchanger to circulate between the second heat exchanger and the first heat exchanger.

[0017] When the unit body stops power supply, the water in the first heat exchanger flows into the outlet pipe from the first bypass port, enters the heat absorption passage of the second heat exchanger for heat exchange, and then flows back into the first heat exchanger from the second bypass port through the return pipe after the water absorbs heat and is heated up, thereby achieving the effect of preventing the water in the first heat exchanger from freezing when the environmental temperature is low when the unit body is powered off.

[0018] That is, as an external device of the unit body, the circulating heating device can ensure that the internal water system of the unit body can be heated and protected in time when the unit body stops, protect the unit body from being damaged due to the freezing of the water system under extreme conditions, and there is no need for the unit body to perform anti-freezing operations on the water system and heat up the water system for anti-freezing under specific startup conditions, enhancing the reliability of the air source heat pump unit and reducing user losses. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of an air source heat pump unit provided by an embodiment of the present invention.

[0021] Reference Signs: 110, the first heat exchanger; 120, the compressor; 130, the second intake pipe; 131, the second valve body; 140, the drain pipe; 141, the third valve body; 210, the second heat exchanger; 220, the outlet pipe; 230, the return pipe; 231, the first valve body; 240, the first intake pipe; 250, the water pump. Detailed Embodiments

[0022] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0024] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0025] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0026] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0027] Existing modular heat pump units generally protect the unit and the water system through the anti-freezing program of the unit, that is, by ensuring the operating water temperature of the unit through the operation of the water pump and the heating operation of the unit to prevent the water system from freezing, or by centralized control to achieve the anti-freezing of the unit, mainly by heating the water through the operation of the water system or the operation of the unit to achieve the anti-freezing of the water system. To achieve the anti-freezing of the unit and the water system by controlling the start and stop of the unit and the water pump, it is necessary to ensure that the unit and the water system cannot lose power, and it cannot ensure the anti-freezing problem of the unit and the system in the case of unexpected power failure or other abnormal power supply.

[0028] As Figure 1 As shown, the air source heat pump unit provided by the embodiment of the present invention includes a unit body and a circulating heating device. The unit body includes a first heat exchanger 110, and the heat absorption path of the first heat exchanger 110 is provided with a first bypass port and a second bypass port; the circulating heating device includes a second heat exchanger 210, a water outlet pipe 220, and a water return pipe 230. The first bypass port is communicated with the inlet of the heat absorption path of the second heat exchanger 210 through the water outlet pipe 220, and the outlet of the heat absorption path of the second heat exchanger 210 is communicated with the second bypass port through the water return pipe 230.

[0029] The air source heat pump unit of the embodiment of the present invention is mainly composed of various devices of the unit body and the newly added circulating heating device. The unit body is an integration of the devices that operate when a conventional air source heat pump unit is working normally, and the circulating heating device is an integration of the devices that operate when the unit body loses power.

[0030] As a part of the unit body, the first heat exchanger 110 has water flowing into the internal heat absorption path, and high-temperature air flows in the heat release path. After the water and the air exchange heat, the water is heated and flows out of the first heat exchanger 110, thereby realizing the function of the heat pump unit to supply heat to users.

[0031] The heat absorption path of the first heat exchanger 110 is also provided with a first bypass port and a second bypass port. The second heat exchanger 210 of the circulating heating device is connected to the first bypass port and the second bypass port respectively through a water outlet pipe 220 and a water return pipe 230, thereby forming a loop for the water in the first heat exchanger 110 to circulate between the second heat exchanger 210 and the first heat exchanger 110.

[0032] When the unit body shuts down and cuts off the power supply, the water in the first heat exchanger 110 flows into the water outlet pipe 220 from the first bypass port, enters the heat absorption path of the second heat exchanger 210 for heat exchange, and then flows back into the first heat exchanger 110 from the second bypass port through the water return pipe 230 after the water absorbs heat and rises in temperature. Thus, the effect of preventing the water in the first heat exchanger 110 from freezing when the ambient temperature is low when the unit body cuts off the power supply is achieved.

[0033] That is, as an external device of the unit body, the circulating heating device can ensure that the internal water system can also be heated and protected in time when the unit body is shut down, protecting the unit body from being damaged due to the freezing of the water system under extreme conditions, eliminating the need for the unit body to perform anti-freezing operations on the water system and heat up for anti-freezing under specific startup conditions, enhancing the reliability of the air source heat pump unit and reducing user losses.

[0034] In this embodiment, the second heat exchanger 210 can adopt a heat storage device, and the inside is filled with a heat storage material to store heat for heating and raising the temperature of the water bypassed from the first heat exchanger 110. In other embodiments, the second heat exchanger 210 can also adopt a conventional heat exchange device such as a tube-sheet heat exchanger to heat and raise the temperature of the water bypassed from the first heat exchanger 110 through other refrigerant media.

[0035] According to an embodiment provided by the present invention, the heat release path of the first heat exchanger 110 is also provided with a third bypass port, and the circulating heating device further includes a first intake pipe 240. The third bypass port is connected to the first inlet of the heat release path of the second heat exchanger 210 through the first intake pipe 240.

[0036] In this embodiment, the heat release path of the first heat exchanger 110 is also provided with a third bypass port, and the second heat exchanger 210 of the circulating heating device is connected to the third bypass port through the first intake pipe 240, thereby forming a path for the high-temperature air in the first heat exchanger 110 to flow to the second heat exchanger 210.

[0037] When the unit body is normally powered on and running, when the high-temperature gas in the heat release path of the first heat exchanger 110 exchanges heat with the water in the heat absorption path, a part of the high-temperature gas can also be diverted and enter the heat release path of the second heat exchanger 210 through the third bypass port and the first intake pipe 240. The heat release path of the second heat exchanger 210 can store the heat in the high-temperature air and heat up the water in the circulating heating device after the unit body shuts down and cuts off the power supply.

[0038] Thus, by providing the third bypass port and the first intake pipe 240, the first heat exchanger 110 can provide heat storage heat for the second heat exchanger 210 when the unit body performs heat pump heating operation. That is, the first intake pipe 240 is the bypass pipeline on the exhaust side of the first heat exchanger 110, and the heat storage heat source of the circulating heating device comes from the bypass pipeline on the exhaust side of the first heat exchanger 110.

[0039] According to an embodiment provided by the present invention, the unit body further includes a compressor 120. The compressor 120 is provided with a fourth bypass port and a second intake pipe 130. The fourth bypass port is communicated with the second inlet of the heat release path of the second heat exchanger 210 through the second intake pipe 130.

[0040] In this embodiment, as a part of the unit body, when the unit body is operating normally for heating, the compressor 120 can deliver compressed air to the heat release path of the first heat exchanger 110. The compressed air has a relatively high temperature to form high-temperature air, which exchanges heat with the water in the heat absorption path of the first heat exchanger 110, and the water temperature rises to supply heat to users.

[0041] The compressor 120 is further provided with a fourth bypass port. The second heat exchanger 210 of the circulating heating device is communicated with the fourth bypass port through the second intake pipe 130, thereby forming a path for the high-temperature air in the compressor 120 to flow to the second heat exchanger 210.

[0042] When the unit body is operating normally and powered on, when the high-temperature gas sent out by the compressor 120 exchanges heat with the water in the heat absorption path of the first heat exchanger 110, a part of the high-temperature gas can also be diverted and enter the heat release path of the second heat exchanger 210 through the fourth bypass port and the second intake pipe 130. The heat release path of the second heat exchanger 210 can store the heat in the high-temperature air, and after the unit body stops power supply, the water in the circulating heating device is heated and the temperature rises.

[0043] Thus, by providing the fourth bypass port and the second intake pipe 130, the compressor 120 can provide heat storage heat for the second heat exchanger 210 when the unit body performs heat pump heating operation. That is, the second intake pipe 130 is the bypass pipeline on the exhaust side of the compressor 120, and the heat storage heat source of the circulating heating device comes from the bypass pipeline on the exhaust side of the compressor 120.

[0044] In other embodiments, a connecting pipeline can also be provided between the heat release path of the second heat exchanger 210 and the heat release path of the first heat exchanger 110. When the unit body is operating normally and powered on, after the high-temperature gas sent out by the compressor 120 passes through the heat release path of the second heat exchanger 210, it can also enter the heat release path of the first heat exchanger 110 and exchange heat with the water in the heat absorption path of the first heat exchanger 110, so that the heat of the compressed air of the compressor 120 can be fully utilized.

[0045] According to an embodiment provided by the present invention, a drain pipe 140 is further provided in the heat absorption passage of the first heat exchanger 110.

[0046] In this embodiment, the heat absorption passage of the first heat exchanger 110 is also connected to a drain pipe 140. When the external environmental temperature is relatively low and the unit body is powered off and stopped, if the water temperature in the heat absorption passage of the first heat exchanger 110 continues to drop and it is difficult for the circulating heating device to heat up the water flowing through the second heat exchanger 210 in a short time, the water in the heat absorption passage of the first heat exchanger 110 is drained through the drain pipe 140 to prevent it from freezing in the first heat exchanger 110, ensuring the timeliness of drainage of the water system of the unit body, protecting the unit from damage due to freezing of the water system under extreme conditions, enhancing the reliability of the unit, and reducing user losses to achieve the anti-freezing effect of the unit body.

[0047] According to an embodiment provided by the present invention, the circulating heating device further includes a temperature sensor, which is arranged in the first heat exchanger 110 and is adapted to detect the water temperature in the first heat exchanger 110.

[0048] In this embodiment, a temperature sensor is also arranged in the heat absorption passage of the first heat exchanger 110. The temperature sensor can detect the water temperature in the first heat exchanger 110 in real time, and control the start and stop of the operation of the circulating heating device and the on-off state of the drain pipe 140 according to the detection result.

[0049] When the external environmental temperature is lower than 0°C and the unit body suddenly loses power, the first heat exchanger 110 can detect the water temperature in the first heat exchanger 110 through the built-in temperature sensor. If the water temperature continues to drop, the water in the first heat exchanger 110 is controlled to enter the second heat exchanger 210 through the outlet pipe 220, and after being heated by the second heat exchanger 210, it flows back into the first heat exchanger 110 through the return pipe 230. When the water temperature drops to a certain temperature, the drain pipe 140 of the first heat exchanger 110 is controlled to directly drain the water in the first heat exchanger 110. The temperature sensor can provide precise control and triggering conditions for the operation of the circulating heating device and the drain pipe 140, providing an automatic anti-freezing performance for the air source heat pump unit.

[0050] It can be understood that a temperature sensor can be arranged inside the water system of each unit body to detect the water temperature, and the setting form of the temperature sensor in the first heat exchanger 110 can also be set according to actual needs to ensure the accuracy and timeliness of temperature detection.

[0051] According to an embodiment provided by the present invention, the circulating heating device further includes a water pump 250, and the water pump 250 is arranged on the outlet pipe 220.

[0052] In this embodiment, the circulating heating device mainly consists of a second heat exchanger 210 and a water pump 250. The water pump 250 is arranged on the outlet pipe 220 to provide power for the water circulation in the circulating heating device. By changing the flow rate of the water pump 250, the water flow velocity between the first heat exchanger 110 and the second heat exchanger 210 can be changed, thereby adjusting the heat exchange amount of water in the second heat exchanger 210, and thus adjusting the water temperature. Therefore, according to the water temperature in the first heat exchanger 110 and the external environmental temperature, the heating condition of the water entering the second heat exchanger 210 can be controlled to avoid insufficient heating or excessive temperature rise.

[0053] In other embodiments, to accelerate the drainage speed of the unit body, a pump body can also be added to the drain pipe 140. The design of the circulating heating device can also save water for the water system of the heat pump unit and avoid the operation of draining water immediately when the machine stops cooling.

[0054] It can be understood that the water pump 250 can also be arranged on the return pipe 230. Since the heat absorption path of the first heat exchanger 110, the outlet pipe 220, the heat absorption path of the second heat exchanger 210, and the return pipe 230 are connected in sequence to form a circulating heating loop, the water pump 250 can provide power for the water circulation in the circulating heating loop whether it is on the return pipe 230 or the outlet pipe 220.

[0055] According to an embodiment provided by the present invention, the circulating heating device further includes a first valve body 231, and the first valve body 231 is arranged on the return pipe 230.

[0056] In this embodiment, a first valve body 231 is also arranged on the return pipe 230. The opening and closing of the return pipe 230 is controlled by the opening and closing of the first valve body 231, and the opening degree of the first valve body 231 affects the water flow rate of the return pipe 230. When the unit body is powered off and stops running, the first valve body 231 can be opened, the water pump 250 is started, and the water in the first heat exchanger 110 flows into the second heat exchanger 210 through the outlet pipe 220, and then returns to the first heat exchanger 110 from the second heat exchanger 210 through the return pipe 230 to realize the antifreeze operation of heating and raising the water temperature.

[0057] Similarly, the opening degree of the first valve body 231 will also change the water flow rate in the return pipe 230, thereby changing the water flow velocity between the first heat exchanger 110 and the second heat exchanger 210, and thus adjusting the heat exchange amount of water in the second heat exchanger 210, and being able to adjust the water temperature. Therefore, according to the water temperature in the first heat exchanger 110 and the external environmental temperature, the heating condition of the water entering the second heat exchanger 210 can be controlled to avoid insufficient heating or excessive temperature rise.

[0058] According to an embodiment provided by the present invention, the circulating heating device further includes a second valve body 131 and a third valve body 141. The second valve body 131 is arranged on the second intake pipe 130, and the third valve body 141 is arranged on the drain pipe 140.

[0059] In this embodiment, a second valve body 131 is further provided on the second intake pipe 130. The opening and closing of the second intake pipe 130 is controlled by the opening and closing of the second valve body 131, and the opening degree of the second valve body 131 affects the gas transmission flow rate of the second intake pipe 130. When the unit body is normally powered on and running, the second valve body 131 can be opened, and the compressed air in the compressor 120 enters the second heat exchanger 210 through the second intake pipe 130 to heat the heat storage material in the second heat exchanger 210, so as to realize the antifreeze operation of heating and raising the temperature of the water entering the second heat exchanger 210 after the unit body is powered off.

[0060] A third valve body 141 is further provided on the drain pipe 140. The opening and closing of the drain pipe 140 is controlled by the opening and closing of the third valve body 141, and the opening degree of the third valve body 141 affects the drainage flow rate of the drain pipe 140. After the unit body is powered off and shut down, if it is necessary to drain the water in the first heat exchanger 110, the third valve body 141 can be opened, and the water in the first heat exchanger 110 flows out of the first heat exchanger 110 through the drain pipe 140 to avoid freezing in the first heat exchanger 110 and achieve the antifreeze effect.

[0061] Similarly, the opening degree of the second valve body 131 further changes the degree of heat storage and temperature rise of the compressed air of the compressor 120 to the second heat exchanger 210, thereby adjusting the heat exchange amount of the water in the second heat exchanger 210 and being able to adjust the water temperature. Thus, according to the water temperature in the first heat exchanger 110 and the external environmental temperature, the heat storage situation of the second heat exchanger 210 can be controlled. When the temperature requirement is reached, the second valve body 131 can be closed, and further the heating situation of the water entering the second heat exchanger 210 can be controlled to avoid insufficient heating or excessive temperature rise.

[0062] According to an embodiment provided by the present invention, the circulating heating device further includes an auxiliary power supply, and the auxiliary power supply is electrically connected to the first valve body 231, the second valve body 131, and the third valve body 141 respectively.

[0063] In this embodiment, the circulating heating device mainly consists of a second heat exchanger 210, a water pump 250, and an auxiliary power supply. Among them, the auxiliary power supply is a power supply independent of the unit power supply connected to the unit body. When the unit body is powered off and shut down, the auxiliary power supply can independently complete the power supply work for the circulating heating device, and further enable the circulating heating device to realize the antifreeze operation of the unit body.

[0064] The auxiliary power supply is equipped with a standby uninterruptible power supply. When the unit body suddenly loses power, the standby power supply is started, and the standby power supply supplies power to the first valve body 231, the second valve body 131, the third valve body 141, the water pump 250, and the temperature sensor to ensure the normal progress of the antifreeze control linkage.

[0065] In this embodiment, the first valve body 231, the second valve body 131, and the third valve body 141 may all be solenoid valves.

[0066] The present invention provides an air source heat pump unit. When the unit body stops and the power is cut off, with the cooperation of a backup power source, a heat storage source, and a detection and control device, it can ensure the timeliness of drainage of the water system of the unit body, protect the unit body from damage due to freezing of the water system under extreme conditions, enhance the reliability of the unit, and reduce user losses.

[0067] An embodiment of the present invention further provides a control method for an air source heat pump unit, which is applied to the air source heat pump unit as described in the above embodiment, and includes: Determine that the ambient temperature is less than 0°C, and determine that the water temperature in the heat absorption path of the first heat exchanger 110 is at a first set temperature and the unit power supply of the air source heat pump unit is not turned on, send a freezing warning message and report a freezing failure; Or, determine that the ambient temperature is less than 0°C, and determine that the water temperature in the heat absorption path of the first heat exchanger 110 continuously drops to a second set temperature, send a freezing notice and control the first valve body 231 to open; Or, determine that the ambient temperature is less than 0°C, and when it is determined that the water temperature in the heat absorption path of the first heat exchanger 110 continuously drops to a third set temperature, control the third valve body 141 to open; Wherein, the second set temperature is less than the first set temperature and greater than the third set temperature, and the third set temperature is greater than or equal to 0°C.

[0068] The control method of the air source heat pump unit in the embodiment of the present invention is an anti-freezing control method. When the detected ambient temperature is lower than 0°C and the unit power supply of the unit body is not turned on, the unit body detects the water temperature of the first heat exchanger 110 through a built-in temperature sensor, and controls the circulating heating device to perform different anti-freezing operations according to different detection results.

[0069] In one embodiment, when the detected ambient temperature is lower than 0°C and the unit power supply of the unit body is not turned on, it is judged whether the water temperature of the first heat exchanger 110 is at the first set temperature. If the water temperature is at the first set temperature, it proves that the water in the first heat exchanger 110 has a freezing risk at this time, and the controller can immediately send a freezing warning message to the user and report a freezing failure. In this embodiment, the first set temperature may be 3°C to 4°C.

[0070] In one embodiment, when the detected ambient temperature is lower than 0°C and the unit power supply of the unit body is not turned on, it is determined whether the water temperature of the first heat exchanger 110 continuously drops to a second set temperature. If the water temperature is at the second set temperature, it proves that the water in the first heat exchanger 110 is cooling and freezing at this time. The controller can immediately send a freezing notice to the user and open the first valve body 231, and the water in the first heat exchanger 110 enters the second heat exchanger 210 for temperature rise and anti-freezing. In this embodiment, the second set temperature can be 1°C to 2°C.

[0071] In one embodiment, when the detected ambient temperature is lower than 0°C and the unit power supply of the unit body is not turned on, it is determined whether the water temperature of the first heat exchanger 110 continuously drops to a third set temperature. If the water temperature is at the third set temperature, it proves that the water in the first heat exchanger 110 cannot be heated and anti-frozen by the second heat exchanger 210 in a short time. The controller can open the second valve body 131 to drain the water in the first heat exchanger 110 for anti-freezing. In this embodiment, the third set temperature can be 0°C.

[0072] In this embodiment, in addition to controlling the actions of the first valve body 231, the second valve body 131, the third valve body 141, the temperature sensor and the water pump 250, the controller also includes a communication control system for sending a freezing risk prompt to the user.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air source heat pump unit, characterized in that, Comprising: The main body of the unit, the main body of the unit includes a first heat exchanger (110), and a first bypass port and a second bypass port are provided in the heat absorption path of the first heat exchanger (110); A circulating heating device, the circulating heating device includes a second heat exchanger (210), a water outlet pipe (220) and a water return pipe (230), the first bypass port is communicated with the inlet of the heat absorption path of the second heat exchanger (210) through the water outlet pipe (220), and the outlet of the heat absorption path of the second heat exchanger (210) is communicated with the second bypass port through the water return pipe (230).

2. The air source heat pump unit according to claim 1, characterized in that, A third bypass port is further provided in the heat release path of the first heat exchanger (110), the circulating heating device further includes a first air inlet pipe (240), and the third bypass port is communicated with the first inlet of the heat release path of the second heat exchanger (210) through the first air inlet pipe (240).

3. The air source heat pump unit according to claim 1 or 2, characterized in that, The main body of the unit further includes a compressor (120), the compressor (120) is provided with a fourth bypass port and a second air inlet pipe (130), and the fourth bypass port is communicated with the second inlet of the heat release path of the second heat exchanger (210) through the second air inlet pipe (130).

4. The air source heat pump unit according to claim 3, wherein A drain pipe (140) is further provided in the heat absorption path of the first heat exchanger (110).

5. The air source heat pump unit according to claim 1, characterized in that, The circulating heating device further includes a temperature sensor, the temperature sensor is arranged in the first heat exchanger (110) and is adapted to detect the water temperature in the first heat exchanger (110).

6. The air source heat pump unit according to claim 1, wherein, The circulating heating device further includes a water pump (250), and the water pump (250) is arranged on the water outlet pipe (220).

7. The air source heat pump unit according to claim 4, characterized in that, The circulating heating device further includes a first valve body (231), and the first valve body (231) is arranged on the water return pipe (230).

8. The air source heat pump unit according to claim 7, characterized in that, The circulating heating device further includes a second valve body (131) and a third valve body (141), the second valve body (131) is arranged on the second air inlet pipe (130), and the third valve body (141) is arranged on the drain pipe (140).

9. The air source heat pump unit according to claim 8, wherein, The circulating heating device further includes an auxiliary power supply, and the auxiliary power supply is electrically connected to the first valve body (231), the second valve body (131) and the third valve body (141) respectively.

10. A control method for an air source heat pump unit, characterized in that, Applied to the air source heat pump unit as described in claim 9 above, including: Determine that the ambient temperature is less than 0°C, and determine that the water temperature in the heat absorption path of the first heat exchanger (110) is at the first set temperature and the unit power supply of the air source heat pump unit is not turned on, send a freezing warning message and report a freezing fault; Or, determine that the ambient temperature is less than 0°C, and determine that the water temperature in the heat absorption path of the first heat exchanger (110) continuously drops to the second set temperature, send a freezing notice and control the first valve body (231) to open; Or, determine that the ambient temperature is less than 0°C, and when it is determined that the water temperature in the heat absorption path of the first heat exchanger (110) continuously drops to the third set temperature, control the third valve body (141) to open; Wherein, the second set temperature is less than the first set temperature and greater than the third set temperature, and the third set temperature is greater than or equal to 0°C.

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