Air source heat pump unit and control method thereof

Abstract

An air source heat pump unit and a control method thereof. The air source heat pump unit comprises a heat conducting medium heat exchange system, a fluorine pump heat exchange system and a first protection pipeline. The heat conducting medium heat exchange system has a liquid outlet pipeline and a liquid return pipeline for external connection. The first protection pipeline is provided with two first electric valves and a first anti-freezing valve between the two first electric valves. The first protection pipeline is connected in parallel with one of the liquid outlet pipeline and the liquid return pipeline. The first electric valves are set to be on when powered off and off when powered on. In a refrigeration mode, both of the first electric valves in the first protection pipeline are powered on. Even if the first anti-freezing valve is opened, the first anti-freezing valve will at most discharge the water between the two first electric valves in the first protection pipeline. In a heating mode, both of the first electric valves in the first protection pipeline are powered off. If the air source heat pump unit is powered off, the circulating water in the heat conducting medium heat exchange system will enter the first protection pipeline and be discharged from the first anti-freezing valve after the first anti-freezing valve is opened.

Description

Technical Field

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

[0002] An air-source heat pump unit for coal-to-electricity conversion includes a heat transfer medium heat exchange system and a refrigerant pump heat exchange system. The air-source heat pump unit is installed outdoors, and the heat transfer medium heat exchange system and the refrigerant pump heat exchange system are also located outdoors. The heat transfer medium heat exchange system is connected to the indoor heating pipes to form a circulation path.

[0003] To prevent the circulating water in the heat transfer medium heat exchange system from freezing and damaging the system due to power outages in winter, both the outlet and return lines of the system are equipped with antifreeze valves. When the temperature of the circulating water in the heat transfer medium heat exchange system drops below 3 degrees Celsius, the antifreeze valve automatically opens to drain the circulating water and prevent it from freezing; when the temperature of the circulating water in the heat transfer medium heat exchange system rises above 4 degrees Celsius, the antifreeze valve automatically closes.

[0004] However, when using an air source heat pump unit for (summer) cooling, if the water temperature is set to 5 degrees Celsius, the temperature of the circulating water in the heat transfer medium system can drop to 3 degrees Celsius. This will cause the antifreeze valve to open automatically, resulting in a large amount of circulating water being discharged from the heat transfer medium system, which is not allowed during cooling. Summary of the Invention

[0005] The main objective of this invention is to provide an air source heat pump unit that can prevent the antifreeze valve from discharging the circulating water in the heat exchange system during cooling.

[0006] The main objective of this invention is to provide a control method for an air source heat pump unit.

[0007] To achieve the above objectives, the air source heat pump unit proposed in this embodiment of the invention includes a heat transfer medium heat exchange system and a refrigerant pump heat exchange system. The heat transfer medium heat exchange system has an outlet pipe and a return pipe for external connection. The air source heat pump unit further includes a first protective pipe with two first electric valves and a first antifreeze valve located between the two first electric valves, connected in parallel with one of the outlet pipe and the return pipe. The first electric valves are configured to open when de-energized and close when energized. The first antifreeze valve is configured to automatically open in response to the temperature of the heat transfer medium between the two first electric valves of the first protective pipe not being higher than a first set temperature, and automatically close in response to the temperature of the heat transfer medium between the two first electric valves of the first protective pipe not being lower than a second set temperature, wherein the first set temperature is ≤ the second set temperature.

[0008] In an exemplary embodiment, the air source heat pump unit further includes: a second protective pipeline provided with two first electric valves and a second antifreeze valve located between the two first electric valves, connected in parallel with another of the liquid outlet pipeline and the liquid return pipeline; wherein the second antifreeze valve is configured to automatically open in response to the temperature of the heat transfer medium between the two first electric valves of the second protective pipeline not being higher than a third set temperature, and to automatically close in response to the temperature of the heat transfer medium between the two first electric valves of the second protective pipeline not being lower than a fourth set temperature, wherein the third set temperature is ≤ the fourth set temperature.

[0009] In an exemplary embodiment, the first protective pipeline is located below the liquid outlet pipeline and is connected in parallel with the liquid outlet pipeline, and the second protective pipeline is located below the liquid return pipeline and is connected in parallel with the liquid return pipeline.

[0010] In one exemplary embodiment, the first set temperature is ≤3 degrees Celsius, the third set temperature is ≤3 degrees Celsius, the second set temperature is ≥4 degrees Celsius, and the fourth set temperature is ≥4 degrees Celsius.

[0011] In an exemplary embodiment, the air source heat pump unit further includes: a second electric valve, configured as an external connection terminal of at least one of the liquid outlet pipeline and the liquid return pipeline, and configured to be de-energized and energized.

[0012] In an exemplary embodiment, the second electric valve includes two valves, one of which is located at the external connection end of the liquid outlet pipeline and the other is located at the external connection end of the liquid return pipeline.

[0013] In an exemplary embodiment, the air source heat pump unit further includes: a third electric valve and a water supply valve, wherein the third electric valve and the water supply valve are configured to be connected in series to form a liquid supply branch, the outlet of the liquid supply branch is configured to be connected to at least one of the liquid outlet pipe and the liquid return pipe, and the third electric valve is configured to be de-energized and open when energized.

[0014] The control method for an air source heat pump unit proposed in this embodiment of the invention includes:

[0015] In response to the first operating mode, the first electric valve is energized and shut off.

[0016] In response to the second operating mode, the first electric valve is de-energized and turned on.

[0017] In one exemplary embodiment, the control method further includes: in response to a first operating mode or a second operating mode, controlling the second electric valve to be energized and turned on.

[0018] In an exemplary embodiment, the control method further includes: in response to a first operating mode or a second operating mode, controlling the third electric valve to be energized and turned on.

[0019] In one exemplary embodiment, the first operating mode includes a cooling mode, and the second operating mode includes a heating mode.

[0020] In this invention, the heat exchange system of the heat transfer medium is connected to the indoor heating pipes through the liquid outlet pipe and the liquid return pipe to form a circulation path. The first protective pipe is connected in parallel with one of the liquid outlet pipe and the liquid return pipe. In cooling mode, both first electric valves on the first protective pipe are energized, causing both first electric valves on the first protective pipe to close. At this time, the first antifreeze valve is not connected to the circulation path. Even if the first antifreeze valve opens, it will at most drain the water between the two first electric valves on the first protective pipe, but will not drain the circulating water in the circulation path. This ensures that the circulating water in the circulation path is not drained. The amount will not decrease, and the cooling performance of the air source heat pump unit is also guaranteed. In heating mode, the two first electric valves on the first protection pipeline are de-energized, so that the two first electric valves on the first protection pipeline are open. At this time, the first antifreeze valve is connected to the circulation path. If the air source heat pump unit is de-energized, as the temperature of the circulating water in the heat transfer medium heat exchange system gradually decreases, after the first antifreeze valve opens, the circulating water in the heat transfer medium heat exchange system will enter the first protection pipeline and be discharged from the first antifreeze valve, which solves the problem of the circulating water in the heat transfer medium heat exchange system freezing and damaging the heat transfer medium heat exchange system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the air source heat pump unit connected to an indoor heating pipe according to one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of another embodiment of the air source heat pump unit connected to the indoor heating pipes according to another embodiment of the present invention;

[0024] Figure 3 The flowchart shows the operation of the first antifreeze valve in its on and off states.

[0025] Figure 4The flowchart shows the operation of the second antifreeze valve in its on and off states.

[0026] Figure 5 This is a flowchart of a control method for an air source heat pump unit according to an embodiment of the present invention;

[0027] Figure 6 This is a flowchart of a control method for an air source heat pump unit according to another embodiment of the present invention.

[0028] in, Figure 1 and Figure 2 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0029] 100 Thermal medium heat exchange system, 110 Liquid outlet pipeline, 120 Liquid return pipeline, 200 Fluorine pump heat exchange system, 300 First protection pipeline, 310 First antifreeze valve, 410 First electric valve, 420 Second electric valve, 430 Third electric valve, 440 Water supply valve, 500 Second protection pipeline, 510 Second antifreeze valve, 600 Indoor heating pipeline.

[0030] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0033] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection. "Connection" can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0036] The air source heat pump unit proposed in the embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the system includes a heat transfer medium heat exchange system 100 and a refrigerant pump heat exchange system 200. The heat transfer medium heat exchange system 100 has an outlet pipe 110 and a return pipe 120 for external connection. The external connection ends of the outlet pipe 110 and the return pipe 120 are connected to the two ends of the indoor heating pipe 600 respectively. The air source heat pump unit also includes a first protection pipe 300 with two first electric valves 410 and a first antifreeze valve 310 located between the two first electric valves 410. The first protection pipe 300 is connected in parallel with one of the outlet pipe 110 and the return pipe 120. The first electric valve 410 is configured to be open when de-energized and closed when energized; for example... Figure 3 As shown, the first antifreeze valve 310 is configured to automatically open in response to the temperature of the heat-conducting medium between the two first electric valves 410 of the first protection pipeline 300 not being higher than the first set temperature, and automatically close in response to the temperature of the heat-conducting medium between the two first electric valves 410 of the first protection pipeline 300 not being lower than the second set temperature, wherein the first set temperature is ≤ the second set temperature, and the heat-conducting medium is water.

[0037] The heat transfer medium heat exchange system 100 is connected to the indoor heating pipe 600 through the liquid outlet pipe 110 and the liquid return pipe 120 to form a circulation path. The first protection pipe 300 is connected in parallel with one of the liquid outlet pipe 110 and the liquid return pipe 120. In cooling mode, both first electric valves 410 on the first protection pipe 300 are energized, causing both first electric valves 410 on the first protection pipe 300 to close. At this time, the first antifreeze valve 310 is not connected to the circulation path. Even if the first antifreeze valve 310 opens (i.e., the temperature of the heat transfer medium between the two first electric valves 410 of the first protection pipe 300 drops to no higher than the first set temperature, causing the first antifreeze valve 310 to open automatically), the first antifreeze valve 310 will at most discharge the water between the two first electric valves 410 on the first protection pipe 300, but will not discharge the circulating water in the circulation path. Only the circulating water volume in the circulation path will not decrease, and the cooling performance of the air source heat pump unit is also guaranteed. In heating mode, the two first electric valves 410 on the first protection pipeline 300 are de-energized, so that the two first electric valves 410 on the first protection pipeline 300 are open. At this time, the first antifreeze valve 310 is connected to the circulation path. If the air source heat pump unit is de-energized, as the temperature of the circulating water in the heat transfer medium heat exchange system 100 gradually decreases, after the first antifreeze valve 310 opens (that is, the water temperature in the first protection pipeline 300 drops to no higher than the first set temperature, causing the first antifreeze valve 310 to open automatically), the circulating water in the heat transfer medium heat exchange system 100 will enter the first protection pipeline 300 and be discharged from the first antifreeze valve 310, thus solving the problem of the circulating water in the heat transfer medium heat exchange system 100 freezing and damaging the heat transfer medium heat exchange system 100.

[0038] In one embodiment, the first protective pipe 300 is connected in parallel with the liquid outlet pipe 110. In the cooling mode, both first electric valves 410 on the first protective pipe 300 are energized, causing both first electric valves 410 on the first protective pipe 300 to close. At this time, the first antifreeze valve 310 is not connected to the circulation path, and the circulating water in the air source heat pump unit is only transmitted to the indoor heating pipe 600 through the liquid outlet pipe 110, and cannot be transmitted to the indoor heating pipe 600 through the first protective pipe 300. In the heating mode, both first electric valves 410 on the first protective pipe 300 are de-energized, causing both first electric valves 410 on the first protective pipe 300 to open. At this time, the first antifreeze valve 310 is connected to the circulation path, and part of the circulating water in the air source heat pump unit is transmitted to the indoor heating pipe 600 through the liquid outlet pipe 110, and the other part is transmitted to the indoor heating pipe 600 through the first protective pipe 300.

[0039] In another embodiment, the first protective pipe 300 and the return pipe 120 are connected in parallel. In the cooling mode, both first electric valves 410 on the first protective pipe 300 are energized, causing both first electric valves 410 on the first protective pipe 300 to close. At this time, the first antifreeze valve 310 is not connected to the circulation path, and the circulating water in the indoor heating pipe 600 is only transferred to the air source heat pump unit through the return pipe 120, and cannot be transferred to the air source heat pump unit through the first protective pipe 300. In the heating mode, both first electric valves 410 on the first protective pipe 300 are de-energized, causing both first electric valves 410 on the first protective pipe 300 to open. At this time, the first antifreeze valve 310 is connected to the circulation path. At this time, part of the circulating water in the indoor heating pipe 600 is transferred to the air source heat pump unit through the return pipe 120, and the other part is transferred to the air source heat pump unit through the first protective pipe 300.

[0040] In one exemplary embodiment, such as Figure 1 and Figure 2 As shown, the air source heat pump unit also includes: a second protective pipeline 500 equipped with two first electric valves 410 and a second antifreeze valve 510 located between the two first electric valves 410, the second protective pipeline 500 being connected in parallel with another of the liquid outlet pipeline 110 and the liquid return pipeline 120; wherein, as Figure 4 As shown, the second antifreeze valve 510 is configured to automatically open in response to the temperature of the heat-conducting medium between the two first electric valves 410 of the second protection pipeline 500 not being higher than a third set temperature, and to automatically close in response to the temperature of the heat-conducting medium between the two first electric valves 410 of the second protection pipeline 500 not being lower than a fourth set temperature, wherein the third set temperature is ≤ the fourth set temperature.

[0041] The heat transfer medium heat exchange system 100 is connected to the indoor heating pipe 600 through the liquid outlet pipe 110 and the liquid return pipe 120 to form a circulation path. The second protection pipe 500 is connected in parallel with the other of the liquid outlet pipe 110 and the liquid return pipe 120. In cooling mode, both first electric valves 410 on the second protection pipe 500 are energized, causing both first electric valves 410 on the second protection pipe 500 to close. At this time, the second antifreeze valve 510 is not connected to the circulation path. Even if the second antifreeze valve 510 opens (i.e., the temperature of the heat transfer medium between the two first electric valves 410 of the second protection pipe 500 drops to no higher than the third set temperature, causing the second antifreeze valve 510 to open automatically), the second antifreeze valve 510 will at most discharge the water between the two first electric valves 410 on the second protection pipe 500, and will not circulate the water in the circulation path. Water is discharged, which not only ensures that the circulating water volume in the circulation path is not reduced, but also guarantees the cooling performance of the air source heat pump unit. In heating mode, the two first electric valves 410 on the second protection pipeline 500 are de-energized, causing both first electric valves 410 on the second protection pipeline 500 to be open. At this time, the second antifreeze valve 510 is connected to the circulation path. If the air source heat pump unit is de-energized, as the temperature of the circulating water in the heat transfer medium heat exchange system 100 gradually decreases, the second antifreeze valve 510 opens (i.e., the water temperature in the second protection pipeline 500 decreases to no higher than the third set temperature, causing the second antifreeze valve 510 to open automatically). The circulating water in the heat transfer medium heat exchange system 100 is discharged from the second antifreeze valve 510, solving the problem of the circulating water in the heat transfer medium heat exchange system 100 freezing and damaging the heat transfer medium heat exchange system 100.

[0042] The first set temperature is the same as the third set temperature, and the second set temperature is the same as the fourth set temperature. In heating mode, when the mains power is cut off and the temperature of the circulating water in the heat transfer medium heat exchange system 100 drops below the first and third set temperatures, both the first antifreeze valve 310 and the second antifreeze valve 510 automatically open to drain the heat transfer medium heat exchange system 100. This allows for faster and more thorough drainage of the circulating water in the heat transfer medium heat exchange system 100, effectively solving the problem of the circulating water freezing and damaging the heat transfer medium heat exchange system 100.

[0043] In one example, such as Figure 1 and Figure 2 As shown, the first protective pipe 300 is located below the outlet pipe 110 and connected in parallel with it, and the second protective pipe 500 is located below the return pipe 120 and connected in parallel with it. Wherein, as Figure 3As shown: In response to the temperature of the heat-conducting medium between the two first electric valves 410 of the first protection pipeline 300 not exceeding the first set temperature, the first antifreeze valve 310 automatically opens; in response to the temperature of the heat-conducting medium between the two first electric valves 410 of the first protection pipeline 300 not falling below the second set temperature, the first antifreeze valve 310 automatically closes; Figure 4 As shown, in response to the temperature of the heat-conducting medium between the two first electric valves 410 of the second protection pipeline 500 not being higher than the third set temperature, the second antifreeze valve 510 automatically turns on; in response to the temperature of the heat-conducting medium between the two first electric valves 410 of the second protection pipeline 500 not being lower than the fourth set temperature, the second antifreeze valve 510 automatically turns off.

[0044] The first antifreeze valve 310 is lower than the outlet pipe 110, and the second antifreeze valve 510 is lower than the return pipe 120. In this way, when the mains power is cut off in heating mode and the temperature of the circulating water in the heat transfer medium heat exchange system 100 drops below the first set temperature and the third set temperature, the first antifreeze valve 310 and the second antifreeze valve 510 will automatically open. As a result, more circulating water in the heat transfer medium heat exchange system 100 can flow out from the first antifreeze valve 310 and the second antifreeze valve 510 under the action of gravity.

[0045] In one embodiment, such as Figure 3 and Figure 4 As shown, the first set temperature is ≤2~3 degrees Celsius, the third set temperature is ≤2~3 degrees Celsius, the second set temperature is ≥4 degrees Celsius, and the fourth set temperature is ≥4 degrees Celsius.

[0046] In one exemplary embodiment, such as Figure 2 As shown, the air source heat pump unit also includes a second electric valve 420. The second electric valve 420 is configured to be located at the external connection end of at least one of the liquid outlet pipe 110 and the liquid return pipe 120. The second electric valve 420 is also configured to close when power is off and open when power is on. The second electric valve 420 is installed indoors. When power is off in winter, the second electric valve 420 closes. The indoor temperature is generally above 0 degrees Celsius, so the circulating water in the indoor heating pipe 600 will not freeze. The second electric valve 420 will block the flow of the circulating water in the indoor heating pipe 600 to the heat exchange system 100, so that the circulating water in the indoor heating pipe 600 is kept in the indoor heating pipe 600. This can reduce the drainage volume of the first antifreeze valve 310 and the second antifreeze valve 510 when they are open. Thus, the amount of water replenished after the air source heat pump unit is powered on again is less, which can save water resources.

[0047] In one example, such as Figure 2As shown, the second electric valve 420 includes two valves, one of which is located at the external connection end of the outlet pipe 110, and the other is located at the external connection end of the return pipe 120. During a power outage in winter, the two second electric valves 420 cut off the circulating water in the indoor heating pipe 600 and the circulating water in the heat transfer medium heat exchange system 100. When the first antifreeze valve 310 and the second antifreeze valve 510 are in operation, they only discharge the circulating water in the heat transfer medium heat exchange system 100. Thus, when the air source heat pump unit is powered on again, it only needs to replenish the water missing from the heat transfer medium heat exchange system 100; the indoor heating pipe 600 does not need to be replenished, resulting in less water consumption and greater water conservation.

[0048] In one exemplary embodiment, such as Figure 1 and Figure 2 As shown, the air source heat pump unit also includes: a third electric valve 430 and a water supply valve 440. The third electric valve 430 and the water supply valve 440 are connected in series to form a liquid supply branch. The liquid supply branch is installed indoors. The outlet of the liquid supply branch is connected to the indoor heating pipe 600, and the inlet of the liquid supply branch is connected to the tap water source. The third electric valve 430 is configured to turn off when power is off and turn on when power is on.

[0049] Among them, the water supply valve 440 is a valve that integrates the functions of pressure reducing valve, gate valve, check valve and filter. The working principle of the water supply valve 440 is roughly similar to that of the pressure reducing valve. It uses the inlet pressure and outlet pressure to balance the spring force. When the system pressure is insufficient, the spring force is greater than the sum of the inlet pressure and the outlet pressure. The valve core of the water supply valve 440 opens under the action of the spring force and begins to supply water from the inlet. As water is continuously supplied to the system, the pressure at the outlet of the water supply valve 440 rises until the inlet pressure and the outlet pressure are equal to the spring force, and the water supply valve 440 closes again.

[0050] Alternatively, the third electric valve 430 can be electrically connected to the mains power supply; or it can be electrically connected to the control device of the air source heat pump unit. When the third electric valve 430 is energized and conducts, if there is a water shortage in the circulation path, the water pressure in the circulation path is lower than the water pressure of the tap water source. At this time, the water supply valve 440 will automatically conduct under the pressure difference, and the tap water source will replenish water into the circulation path. When the water pressure in the circulation path is equal to the water pressure of the tap water source, the water supply valve 440 will automatically close, and the water replenishment in the circulation path will be completed. In the event of a mains power outage, the third electric valve 430 will close. In winter, when the first antifreeze valve 310 and the second antifreeze valve 510 are open for drainage, the tap water source cannot replenish water into the circulation path because the third electric valve 430 is closed.

[0051] The control method for air source heat pump units proposed in this embodiment of the invention, such as... Figure 5 As shown, it includes:

[0052] In response to the first operating mode, the first electric valve 410 is energized and shut off.

[0053] In response to the second operating mode, the first electric valve 410 is de-energized and turned on.

[0054] The first operating mode is set to cooling mode (i.e., cooling operation). In cooling mode, both first electric valves 410 on the first protective pipe 300 are energized, causing both first electric valves 410 on the first protective pipe 300 to close. At this time, the first antifreeze valve 310 is not connected to the circulation path. Even if the first antifreeze valve 310 opens, it will at most drain the water between the two first electric valves 410 on the first protective pipe 300, and will not drain the circulating water in the circulation path. In this way, not only will the amount of circulating water in the circulation path not decrease, but the cooling performance of the air source heat pump unit is also guaranteed. The second operating mode is set to heating mode. In the heating mode, both first electric valves 410 on the first protective pipeline 300 are de-energized, causing both first electric valves 410 on the first protective pipeline 300 to be open. At this time, the first antifreeze valve 310 is connected to the circulation path. If the air source heat pump unit is de-energized, as the temperature of the circulating water in the heat transfer medium heat exchange system 100 gradually decreases, after the first antifreeze valve 310 opens, the circulating water in the heat transfer medium heat exchange system 100 will enter the first protective pipeline 300 and be discharged from the first antifreeze valve 310, thus solving the problem of the circulating water in the heat transfer medium heat exchange system 100 freezing and damaging the heat transfer medium heat exchange system 100.

[0055] During the operation of an air source heat pump unit, such as Figure 3 As shown, when the temperature of the heat-conducting medium between the two first electric valves 410 in the first protective pipeline 300 is not higher than the first set temperature, the first antifreeze valve 310 automatically opens; when the temperature of the heat-conducting medium between the two first electric valves 410 in the first protective pipeline 300 is not lower than the second set temperature, the first antifreeze valve 310 automatically closes; Figure 4 As shown, when the temperature of the heat-conducting medium between the two first electric valves 410 in the second protection pipeline 500 is not higher than the third set temperature, the second antifreeze valve 510 automatically turns on; when the temperature of the heat-conducting medium between the two first electric valves 410 in the second protection pipeline 500 is not lower than the fourth set temperature, the second antifreeze valve 510 automatically turns off.

[0056] In one example, such as Figure 6 As shown, the control method further includes: in response to the first operating mode or the second operating mode, controlling the second electric valve 420 to be energized and turned on.

[0057] The second electric valve 420 is installed indoors. When the power is off in winter, the second electric valve 420 is closed. The indoor temperature is generally above 0 degrees Celsius, so the circulating water in the indoor heating pipe 600 will not freeze. The second electric valve 420 prevents the indoor circulating water from flowing to the heat exchange system 100, so that the circulating water is kept in the indoor heating pipe 600. This reduces the drainage volume of the first antifreeze valve 310 and the second antifreeze valve 510 when they are open. As a result, the amount of water replenished after the air source heat pump unit is powered on again is less, which can save water resources.

[0058] During the operation of an air source heat pump unit, such as Figure 3 As shown, when the temperature of the heat-conducting medium between the two first electric valves 410 in the first protective pipeline 300 is not higher than the first set temperature, the first antifreeze valve 310 automatically opens; when the temperature of the heat-conducting medium between the two first electric valves 410 in the first protective pipeline 300 is not lower than the second set temperature, the first antifreeze valve 310 automatically closes; Figure 4 As shown, when the temperature of the heat-conducting medium between the two first electric valves 410 in the second protection pipeline 500 is not higher than the third set temperature, the second antifreeze valve 510 automatically turns on; when the temperature of the heat-conducting medium between the two first electric valves 410 in the second protection pipeline 500 is not lower than the fourth set temperature, the second antifreeze valve 510 automatically turns off.

[0059] In one example, the control method further includes controlling a third electric valve 430 to be energized and turned on (not shown) in response to a first operating mode or a second operating mode.

[0060] When the third electric valve 430 is energized and conducts, if there is a water shortage in the circulation path, the water pressure in the circulation path will be lower than the water pressure of the tap water source. At this time, the water supply valve 440 will automatically conduct under the pressure difference, and the tap water source will replenish water into the circulation path. When the water pressure in the circulation path equals the water pressure of the tap water source, the water supply valve 440 will automatically close, and the water replenishment in the circulation path will be completed. In the event of a power outage, the third electric valve 430 will close. In winter, when the first antifreeze valve 310 and the second antifreeze valve 510 are activated for drainage, the tap water source will not replenish water into the circulation path.

[0061] Alternatively, the third electric valve 430 can be directly connected to the mains power supply, which can also achieve the purpose of this application. The purpose of this application does not deviate from the design concept of this invention, and will not be elaborated here. All of these should fall within the protection scope of this application.

[0062] In summary, in the technical solution of the present invention, the heat transfer medium heat exchange system communicates with the indoor heating pipeline through the liquid outlet pipeline and the liquid return pipeline to form a circulation flow path, and the first protection pipeline is connected in parallel with one of the liquid outlet pipeline and the liquid return pipeline; in the cooling mode, the two first electric valves on the first protection pipeline are controlled to be energized, so that both of the two first electric valves on the first protection pipeline are closed. At this time, the first anti-freeze valve is not in communication with the circulation flow path. Even if the first anti-freeze valve is opened, the first anti-freeze valve can at most discharge the water between the two first electric valves on the first protection pipeline, and will not discharge the circulating water in the circulation flow path. In this way, not only the amount of circulating water in the circulation flow path will not be reduced, but also the cooling performance of the air-source heat pump unit is guaranteed; in the heating mode, the two first electric valves on the first protection pipeline are controlled to be de-energized, so that both of the two first electric valves on the first protection pipeline are conducted. At this time, the first anti-freeze valve is in communication with the circulation flow path. If the air-source heat pump unit is powered off, as the temperature of the circulating water in the heat transfer medium heat exchange system gradually decreases, after the first anti-freeze valve is opened, the circulating water in the heat transfer medium heat exchange system will enter the first protection pipeline and be discharged from the first anti-freeze valve, which solves the problem that the circulating water in the heat transfer medium heat exchange system freezes and ruptures the heat transfer medium heat exchange system.

[0063] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "square-shaped structure" and the like are based on the orientation or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred structure must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0064] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "connected", "directly connected", "indirectly connected", "fixedly connected", "mounted", "assembled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; the terms "mounted", "connected", "fixedly connected" may be directly connected, or indirectly connected through an intermediate medium, or may be in communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood under specific circumstances.

[0065] Although the embodiments disclosed in the present invention are as described above, the described contents are only the embodiments adopted for the convenience of understanding the present invention, and are not intended to limit the present invention. Any person skilled in the art to which the present invention pertains may make any modifications and variations in the form and details of implementation without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention shall still be subject to the definition of the appended claims.

[0066] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An air source heat pump unit, characterized in that, The system includes a heat exchange system using a heat transfer medium and a refrigerant pump, wherein the heat transfer medium heat exchange system has an outlet pipe and a return pipe for external connection; characterized in that the air source heat pump unit further includes: A first protective pipeline is provided with two first electric valves and a first antifreeze valve located between the two first electric valves, and is connected in parallel with one of the liquid outlet pipeline and the liquid return pipeline; The first electric valve is configured to conduct when de-energized and shut off when energized; the first antifreeze valve is configured to automatically conduct when the temperature of the heat-conducting medium between the two first electric valves in the first protection pipeline is not higher than a first set temperature, and automatically shut off when the temperature of the heat-conducting medium between the two first electric valves in the first protection pipeline is not lower than a second set temperature, wherein the first set temperature is ≤ the second set temperature. The air source heat pump unit is configured such that, in cooling mode, the two first electric valves are energized and shut off; and in heating mode, the two first electric valves are de-energized and open.

2. The air source heat pump unit according to claim 1, characterized in that, Also includes: A second protective pipeline is provided with two first electric valves and a second antifreeze valve located between the two first electric valves, and is connected in parallel with another of the liquid outlet pipeline and the liquid return pipeline; The second antifreeze valve is configured to automatically open in response to the temperature of the heat-conducting medium between the two first electric valves in the second protection pipeline not being higher than a third set temperature, and to automatically close in response to the temperature of the heat-conducting medium between the two first electric valves in the second protection pipeline not being lower than a fourth set temperature, wherein the third set temperature is ≤ the fourth set temperature.

3. The air source heat pump unit according to claim 2, characterized in that, The first protective pipeline is located below the liquid outlet pipeline and is connected in parallel with the liquid outlet pipeline, and the second protective pipeline is located below the liquid return pipeline and is connected in parallel with the liquid return pipeline.

4. The air source heat pump unit according to claim 2, characterized in that, The first set temperature is ≤3 degrees Celsius, the third set temperature is ≤3 degrees Celsius, the second set temperature is ≥4 degrees Celsius, and the fourth set temperature is ≥4 degrees Celsius.

5. The air source heat pump unit according to any one of claims 1 to 4, characterized in that, Also includes: The second electric valve is configured to be located at the external connection end of at least one of the liquid outlet pipeline and the liquid return pipeline, and is also configured to be de-energized and energized.

6. The air source heat pump unit according to claim 5, characterized in that, The second electric valve includes two valves, one of which is located at the external connection end of the liquid outlet pipeline and the other is located at the external connection end of the liquid return pipeline.

7. The air source heat pump unit according to any one of claims 1 to 4, characterized in that, Also includes: The third electric valve and the water supply valve are configured to be connected in series to form a liquid supply branch. The outlet of the liquid supply branch is configured to be connected to at least one of the liquid outlet pipeline and the liquid return pipeline. The third electric valve is configured to be de-energized and energized.

8. A control method for an air source heat pump unit as described in any one of claims 1 to 7, characterized in that, include: In response to the first operating mode, the first electric valve is energized and shut off. In response to the second operating mode, the first electric valve is de-energized and turned on.

9. The control method according to claim 8, characterized in that, The air source heat pump unit is the air source heat pump unit as described in claim 5; the control method further includes: In response to either the first or second operating mode, the second electric valve is also energized and turned on.

10. The control method according to claim 8, characterized in that, The air source heat pump unit is the air source heat pump unit according to claim 7; the control method further includes: In response to either the first or second operating mode, the third electric valve is also energized and turned on.

11. The control method according to any one of claims 8 to 10, characterized in that, The first operating mode includes a cooling mode, and the second operating mode includes a heating mode.

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