Anti-freezing water system, heat pump unit and control method of heat pump unit

Abstract

The invention discloses an anti-freezing water system, a heat pump unit and a control method of the heat pump unit. The anti-freezing water system comprises a heat exchanger, a first water pipe, a drainage pipe, a first anti-freezing valve, a second anti-freezing valve, an anti-freezing solution connecting pipe and an anti-freezing solution storage tank. A first control valve is arranged on the first water pipe; one end of the drainage pipe is connected with the first water pipe and located on one side of the first control valve; the first frost valve is provided with a first channel and a second channel which are spaced. The first channel is connected to the first water pipe in series and located on one side of the drainage pipe. One end of the third channel is connected with one end, far away from the first water pipe, of the drainage pipe; one end of the anti-freezing solution connecting pipe is connected with the drainage pipe, and the second channel is connected to the anti-freezing solution connecting pipe in series; the anti-freezing solution storage tank is connected with the end, away from the drainage pipe, of the anti-freezing solution connecting pipe. According to the anti-freezing water system, the anti-freezing water system can avoid drainage failure, and it is guaranteed that water remaining in the water system can be drained smoothly.

Description

Technical Field

[0001] The present invention relates to the technical field of air treatment equipment, and in particular to an antifreeze water system, a heat pump unit and a control method for the heat pump unit. Background Art

[0002] In the prior art, when the temperature of the valve core of the antifreeze valve is low, the antifreeze valve of the water system automatically opens to drain water. However, when the ambient temperature is low and the temperature difference between the ambient temperature and the water temperature is large, for example, when the ambient temperature is lower than -25°C and the water temperature is greater than 10°C, the antifreeze valve opens to drain water, and the discharged water will cool down and freeze quickly. The drainage rate of the water system is very low, and then the water outlet is frozen, resulting in drainage failure. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an antifreeze water system, which can avoid drainage failure and ensure that the water retained in the water system can be drained smoothly.

[0004] The present invention also provides a heat pump unit, which includes the above-mentioned antifreeze water system.

[0005] The present invention further provides a control method for a heat pump unit, and the control method for a heat pump unit includes the above-mentioned heat pump unit.

[0006] The antifreeze water system according to the embodiment of the present invention includes a heat exchanger, a first water pipe, a drain pipe, a first antifreeze valve, a second antifreeze valve, an antifreeze liquid connecting pipe and an antifreeze liquid storage tank. The heat exchanger has a first heat exchange flow path, the first heat exchange flow path has a first water inlet and a second water inlet, the first water inlet is located below the second water inlet; one end of the first water pipe is connected to the first water inlet; one end of the drain pipe is connected to the first water pipe, and the drain pipe is located below the first water pipe; the first antifreeze valve has a first channel and a second channel separated from each other, the first channel is connected in series to the first water pipe and is located on a side of the drain pipe close to the first water inlet, and the first antifreeze valve is configured to control the on-off of the second channel according to the water temperature in the first channel; the second antifreeze valve has a third channel, one end of the third channel is connected to an end of the drain pipe away from the first water pipe, and valve cores are provided in the second channel and the third channel, and the valve cores are configured to open when the temperature is lower than a preset temperature; one end of the antifreeze liquid connecting pipe is connected to the drain pipe, and the second channel is connected in series to the antifreeze liquid connecting pipe; the antifreeze liquid storage tank is connected to an end of the antifreeze liquid connecting pipe away from the drain pipe.

[0007] According to the antifreeze water system of the embodiment of the present invention, the first channel of the first antifreeze valve is connected in series to the first water pipe and is located on the side of the drain pipe close to the first water outlet, one end of the third channel of the second antifreeze valve is connected to the end of the drain pipe away from the first water pipe, the second channel of the first antifreeze valve and the third channel of the second antifreeze valve are provided with valve cores, the first channel and the second channel can conduct heat, and the opening and closing of the valve cores are controlled by the temperature of water in the first channel, one end of the antifreeze liquid connecting pipe is connected to the drain pipe, and the second channel is connected in series to the antifreeze liquid connecting pipe. When the temperature of the water in the first channel is lower than the preset temperature, the valve core of the second channel is opened, the valve core of the third channel is opened, the antifreeze liquid flows through the second channel and flows to the third channel of the second antifreeze valve, the water discharged through the drain pipe is mixed with the antifreeze liquid at the third channel, so that the freezing point of the mixed liquid is reduced, the water outlet of the second antifreeze valve is avoided to be blocked by ice due to the low ambient temperature, and the drainage failure is avoided, so as to ensure that the water retained in the water system can be discharged smoothly.

[0008] In some embodiments of the present invention, a liquid level switch is provided in the antifreeze liquid storage tank; the antifreeze water system further comprises a control module and an alarm device. The liquid level switch is connected to the control module; the alarm device is connected to the control module, and the alarm device is configured to alarm when the liquid level detected by the liquid level switch is lower than a preset value.

[0009] In some embodiments of the present invention, the first water inlet is a water outlet, and the second water inlet is a water inlet; or, the first water inlet is a water inlet, and the second water inlet is a water outlet.

[0010] In some embodiments of the present invention, the antifreeze water system includes a first control valve, which is arranged in the first water pipe, and one end of the drain pipe connected to the first water pipe is located between the first control valve and the first water outlet.

[0011] In some embodiments of the present invention, the antifreeze water system also includes a second water pipe and a second control valve, one end of the second water pipe is connected to a second water outlet, the second water pipe is provided with the second control valve, and at least a portion of the second water pipe is located above the first water pipe.

[0012] In some embodiments of the present invention, the antifreeze water system further includes an expansion tank, and the expansion tank is connected to the second water pipe.

[0013] In some embodiments of the present invention, the antifreeze water system further comprises a water pump and a connecting pipe. One end of the second water pipe is connected to one of the inlet and the outlet of the water pump; one end of the connecting pipe is connected to the other of the inlet and the outlet of the water pump, and the other end is connected to the second water outlet, and the second water pipe is indirectly connected to the second water outlet through the water pump and the connecting pipe.

[0014] In some embodiments of the present invention, the antifreeze water system further includes an air intake valve, which is connected to the connecting pipe and is located at the highest point of the antifreeze water system.

[0015] In some embodiments of the present invention, the volume of the antifreeze liquid storage tank is the same as the volume of the antifreeze water system between the first control valve and the second control valve.

[0016] In some embodiments of the present invention, the second antifreeze valve is located below the first water inlet.

[0017] The heat pump unit according to the embodiment of the present invention comprises a housing and the above-mentioned antifreeze water system, wherein the heat exchanger and the antifreeze liquid storage tank are arranged in the housing.

[0018] According to the heat pump unit of the embodiment of the present invention, the first channel of the first antifreeze valve is connected in series to the first water pipe and is located on the side of the drain pipe close to the first water outlet, one end of the third channel of the second antifreeze valve is connected to the end of the drain pipe away from the first water pipe, the second channel of the first antifreeze valve and the third channel of the second antifreeze valve are provided with valve cores, the first channel and the second channel can conduct heat, and the opening and closing of the valve cores are controlled by the temperature of water in the first channel, one end of the antifreeze liquid connecting pipe is connected to the drain pipe, and the second channel is connected in series to the antifreeze liquid connecting pipe. When the temperature of the water in the first channel is lower than the preset temperature, the valve core of the second channel is opened, the valve core of the third channel is opened, the antifreeze liquid flows through the second channel and flows to the third channel of the second antifreeze valve, the water discharged through the drain pipe is mixed with the antifreeze liquid at the third channel, so that the freezing point of the mixed liquid is reduced, the water outlet of the second antifreeze valve is avoided to be blocked by ice due to the low ambient temperature, and the drainage failure is avoided, so that the water retained in the water system can be smoothly discharged, and the damage of the heat pump unit due to low temperature freezing is avoided.

[0019] The control method of the heat pump unit according to the embodiment of the present invention includes the above-mentioned heat pump unit. The control method of the heat pump unit includes: obtaining the water temperature in the first channel and the ambient temperature of the second antifreeze valve; when the water temperature is lower than the set temperature, the second channel is turned on; when the ambient temperature is lower than the preset temperature, the second antifreeze valve is turned on; wherein the set temperature is greater than or equal to the preset temperature.

[0020] According to the control method of the heat pump unit of the embodiment of the present invention,

[0021] In some embodiments of the present invention, the antifreeze water system also includes a second water pipe, a first control valve and a second control valve, one end of the second water pipe is connected to a second water outlet, the second water pipe is provided with the second control valve, the first control valve is arranged in the first water pipe, and the end of the drain pipe connected to the first water pipe is located between the first control valve and the first water outlet, and the control method of the heat pump unit includes: when the heat pump unit is shut down or powered off, controlling the second control valve to cut off, and controlling the first control valve to prevent the water in the first water pipe from flowing to the heat exchanger.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 is a schematic diagram of a drainage state of an antifreeze water system according to an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of a normal power-on state of an antifreeze water system according to an embodiment of the present invention;

[0026] Figure 3 is a flow chart of a normal power-on state of an antifreeze water system according to an embodiment of the present invention;

[0027] Figure 4 is a flow chart of the water flow direction of the antifreeze water system according to an embodiment of the present invention;

[0028] Figure 5 is a flow chart of the drainage state of the antifreeze water system according to an embodiment of the present invention;

[0029] Figure 6 1 is a flow chart of the antifreeze water system when being shut down according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] 100. Antifreeze water system;

[0032] 1. heat exchanger; 11. first heat exchange flow path; 111. first water inlet; 112. second water inlet; 12. second heat exchange flow path; 13. fluorine system;

[0033] 2. First water pipe; 21. First control valve;

[0034] 3. Drain pipe;

[0035] 4. First antifreeze valve; 41. First channel; 42. Second channel;

[0036] 5. Second antifreeze valve; 51. Third channel;

[0037] 6. Antifreeze connecting pipe;

[0038] 7. Antifreeze storage tank; 71. Liquid level switch;

[0039] 8. Second water pipe; 81. Second control valve; 82. Expansion tank; 83. Water pump; 84. Connecting pipe; 85. Air intake valve. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The antifreeze water system 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0044] like Figure 1 and Figure 2As shown, the antifreeze water system 100 according to an embodiment of the present invention includes a heat exchanger 1, a first water pipe 2, a drain pipe 3, a first antifreeze valve 4, a second antifreeze valve 5, an antifreeze liquid connecting pipe 6 and an antifreeze liquid storage tank 7.

[0045] Specifically, Figure 1 and Figure 2 As shown, the heat exchanger 1 has a first heat exchange flow path 11 and a second heat exchange flow path 12, wherein the heat exchanger 1 may be a water-fluorine plate heat exchanger 1, the first heat exchange flow path 11 may be a water flow path, the second heat exchange flow path 12 may be a fluorine system flow path, the first heat exchange flow path 11 and the second heat exchange flow path 12 transfer heat between the plates of the heat exchanger 1 to achieve heating or cooling of water in the heat exchanger 1. The first heat exchange flow path 11 has a first water inlet 111 and a second water inlet 112, the first water inlet 111 and the second water inlet 112 may achieve water circulation in the first heat exchange flow path 11 in the heat exchanger 1, and the first water inlet 111 is located below the second water inlet 112.

[0046] like Figure 1 and Figure 2 As shown, one end of the first water pipe 2 is connected to the first water outlet 111 , and the first water pipe 2 can supply water to the first heat exchange flow path 11 , or can allow water from the first heat exchange flow path 11 to flow out.

[0047] like Figure 1 and Figure 2 As shown, the antifreeze water system 100 also includes an antifreeze storage tank 7 and an antifreeze connecting pipe 6. The antifreeze storage tank 7 is used to store antifreeze. When the antifreeze reserve is insufficient, antifreeze can be added to the antifreeze storage tank 7 to ensure that the antifreeze in the water system is sufficient.

[0048] like Figure 1 and Figure 2 As shown, one end of the drain pipe 3 is connected to the first water pipe 2 and is located on the side of the first control valve 21 near the first water inlet 111. When the water system is closed, under the action of gravity, the water accumulated in the pipe above the heat exchanger 1 and the water of the heat exchanger 1 located above the first water inlet 111 flow downward, and flow from the first water inlet 111 to the first water pipe 2 connected to the first water inlet 111. There may be accumulated water in the first water pipe 2. The drain pipe 3 is located below the first water pipe 2. The accumulated water can be discharged from the first water pipe 2 through the drain pipe 3 to avoid freezing of accumulated water under low temperature conditions and to avoid expansion of accumulated water and damage to other components in the water system. One end of the antifreeze connecting pipe 6 is connected to the drain pipe 3, and the antifreeze storage tank 7 is connected to the end of the antifreeze connecting pipe 6 away from the drain pipe 3.

[0049] like Figure 1 and Figure 2As shown, the first antifreeze valve 4 has a first channel 41 and a second channel 42 separated from each other. The first channel 41 is connected in series to the first water pipe 2 and is located on the side of the drain pipe 3 close to the first water inlet 111. The first antifreeze valve 4 is configured to control the on-off of the second channel 42 according to the water temperature in the first channel 41. The second channel 42 is connected in series to the antifreeze liquid connecting pipe 6. It can be understood that the first channel 41 is a water channel and the second channel 42 is an antifreeze liquid channel. In the first antifreeze valve 4, water and antifreeze liquid are completely separated, which can prevent the antifreeze liquid from entering the first channel 41, prevent the antifreeze liquid from entering the first water pipe 2, and prevent the metal materials in the water system from being corroded by the oxidation of the antifreeze liquid.

[0050] like Figure 1 and Figure 2 As shown, the second antifreeze valve 5 has a third channel 51, one end of the third channel 51 is connected to the end of the drain pipe 3 away from the first water pipe 2, and a valve core is provided in the second channel 42 and the third channel 51, and the valve core is configured to open when the temperature is lower than a preset temperature. The first channel 41 and the second channel 42 can conduct heat, and the temperature of the water in the first channel 41 is used to control the opening and closing of the valve core. When the temperature of the water in the first channel 41 is lower than the preset temperature, the valve core of the second channel 42 is opened, the drain pipe 3 is connected to the first water pipe 2, and the drain pipe 3 is connected to 41 in the first channel. When the temperature of the water in the first channel 41 is lower than the preset temperature, the temperature of the water in the drain pipe 3 is also lower than the preset temperature, the valve core of the third channel 51 is opened, the antifreeze flows through the second channel 42 and flows to the third channel 51 of the second antifreeze valve 5. The water discharged through the drain pipe 3 is mixed with the antifreeze in the third channel 51, so that the freezing point of the mixed liquid is reduced to below 0°C, thereby avoiding ice blockage of the water outlet of the second antifreeze valve 5 due to the low ambient temperature, avoiding drainage failure, and ensuring that the water retained in the water system can be discharged smoothly.

[0051] According to the antifreeze water system 100 of the embodiment of the present invention, the first channel 41 of the first antifreeze valve 4 is connected in series to the first water pipe 2 and is located on the side of the drain pipe 3 close to the first water inlet 111, one end of the third channel 51 of the second antifreeze valve 5 is connected to the end of the drain pipe 3 away from the first water pipe 2, the second channel 42 of the first antifreeze valve 4 and the third channel 51 of the second antifreeze valve 5 are provided with valve cores, the first channel 41 and the second channel 42 can conduct heat, and the opening and closing of the valve core are controlled by the temperature of the water in the first channel 41, and one end of the antifreeze liquid connecting pipe 6 is connected to the drain pipe 3. The drain pipe 3 is connected, and the second channel 42 is connected in series to the antifreeze connecting pipe 6. When the temperature of the water in the first channel 41 is lower than the preset temperature, the valve core of the second channel 42 opens, and the valve core of the third channel 51 opens, and the antifreeze flows through the second channel 42 and flows to the third channel 51 of the second antifreeze valve 5. The water discharged through the drain pipe 3 is mixed with the antifreeze in the third channel 51, so that the freezing point of the mixed liquid is reduced, thereby avoiding ice blockage at the water outlet of the second antifreeze valve 5 due to the low ambient temperature, avoiding drainage failure, and ensuring that the water retained in the water system can be discharged smoothly.

[0052] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, a liquid level switch 71 is provided in the antifreeze storage tank 7. The liquid level switch 71 can detect the liquid level of the antifreeze in the antifreeze storage tank 7, and can better monitor the storage status of the antifreeze, prevent the water system from freezing due to lack of antifreeze, and prevent the water from expanding and damaging other components in the water system.

[0053] Furthermore, if Figure 3 As shown, the antifreeze water system 100 also includes a control module and an alarm device. The liquid level switch 71 is connected to the control module, and the alarm device is connected to the control module. The alarm device is configured to alarm when the liquid level detected by the liquid level switch 71 is lower than a preset value. When the liquid level detected by the liquid level switch 71 is lower than a preset value, the liquid level switch 71 is turned on. When the water system is started, the liquid level switch 71 transmits a signal to the control module, and the control module controls the alarm device to alarm, prompting the user to add antifreeze liquid to ensure that the antifreeze liquid in the water system is sufficient.

[0054] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the first water inlet 111 is a water outlet, and the second water inlet 112 is a water inlet. The first water inlet 111 is located below the second water inlet 112, which can make the process of water flowing from the second water inlet 112 to the first water inlet 111 simpler, making the flow process of the water system simpler.

[0055] In some embodiments of the present invention, the first water inlet 111 is a water inlet, and the second water inlet 112 is a water outlet. This can prevent water from continuing to flow to the water outlet under the action of gravity when the water system is turned off, reduce water accumulation at the water outlet when the water system is turned off, and allow the accumulated water to be concentrated at the first water pipe 2 connected to the first water inlet 111, so that the accumulated water can be better discharged from the drain pipe 3.

[0056] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the antifreeze water system 100 includes a first control valve 21, which is arranged in the first water pipe 2, and one end of the drain pipe 3 connected to the first water pipe 2 is located between the first control valve 21 and the first water port 111. The on-off of the first water pipe 2 can be controlled by controlling the on-off of the first control valve 21, and the process of the first water pipe 2 supplying water to the first heat exchange flow path 11 can be controlled, or the process of the water outflow of the first heat exchange flow path 11 can be controlled, so that the flow of the first heat exchange flow path 11 is more controllable. The first control valve 21 is a one-way valve. When the first water port 111 is the water outlet and the second water port 112 is the water inlet, the one-way valve can make the water in the first water pipe 2 that has been heat exchanged by the heat exchanger 1 flow to the user's water use position, which can prevent the water on the user side from flowing back into other parts of the water system through the first water pipe 2, and can better reduce the accumulation of water in the water system. When the first water port 111 is the water inlet and the second water port 112 is the water outlet, the one-way valve can allow the water in the first water pipe 2 to flow toward the heat exchanger 1, thereby preventing the water in the heat exchanger 1 from flowing back to the water inlet through the first water pipe 2, and effectively reducing water accumulation in the water system.

[0057] In some embodiments of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, the antifreeze water system 100 also includes a second water pipe 8 and a second control valve 81. One end of the second water pipe 8 is connected to the second water port 112. The second water pipe 8 is provided with a second control valve 81. At least part of the second water pipe 8 is located above the first water pipe 2. In this embodiment, the first water port 111 is a water outlet, the second water port 112 is a water inlet, the first water port 111 is located below the second water port 112, and the second water pipe 8 is located above the first water pipe 2. When the water system is working normally, the second water pipe 8 can be used as a water inlet pipe to feed water into the water inlet of the heat exchanger 1. After the water is heat exchanged inside the heat exchanger 1, it flows out of the water outlet and flows to the first water pipe 2, and flows toward the user's water use position. The second water pipe 8 is located at a higher position, which can make the flow of water from the water inlet to the water outlet of the water system simpler, making the flow process of the water system more reliable.

[0058] Furthermore, if Figure 1 , Figure 2 and Figure 5As shown, the second control valve 81 is a two-way valve, and the second control valve 81 is a manual control valve or an electric control valve. The two-way valve can control the connection and disconnection between the second water pipe 8 of the water system and the user's water-using side. When the second control valve 81 is a manual control valve, the user can manually control the connection and disconnection between the second water pipe 8 of the water system and the user's water-using side according to their own needs; when the second control valve 81 is an electric control valve, the two-way valve can be a normally closed type. When the water system is powered on, the two-way valve is opened, and the second water pipe 8 of the water system and the pipeline on the user's water-using side are connected to water; after the water system is powered off, the two-way valve is closed, and the second water pipe 8 of the water system and the pipeline on the user's water-using side are disconnected.

[0059] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the antifreeze water system 100 also includes an expansion tank 82, which is connected to the second water pipe 8. During the heat exchange process of the water system, after the water absorbs heat, the expansion tank 82 is used to withstand the pressure of water expansion, which can avoid explosion and other failures of the water system due to water expansion, and increase the reliability of the water system.

[0060] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the antifreeze water system 100 also includes a water pump 83 and a connecting pipe 84. One end of the second water pipe 8 is connected to one of the inlet and outlet of the water pump 83, one end of the connecting pipe 84 is connected to the other of the inlet and outlet of the water pump 83, and the other end is connected to the second water inlet 112. The second water pipe 8 is indirectly connected to the second water inlet 112 through the water pump 83 and the connecting pipe 84. It can be understood that when the first water inlet 111 is the water outlet and the second water inlet 112 is the water inlet, one end of the second water pipe 8 is connected to the inlet of the water pump 83, one end of the connecting pipe 84 is connected to the outlet of the water pump 83, and the other end of the connecting pipe 84 is connected to the second water inlet 112. The water pump 83 can provide power for the water inlet of the heat exchanger 1, so that the water inlet process of the heat exchanger 1 is more reliable; when the first water inlet 111 is the water inlet and the second water inlet 112 is the water outlet, one end of the second water pipe 8 is connected to the outlet of the water pump 83, one end of the connecting pipe 84 is connected to the inlet of the water pump 83, and the other end of the connecting pipe 84 is connected to the second water inlet 112. The water pump 83 can provide power for the water outlet of the heat exchanger 1, so that the water outlet process of the heat exchanger 1 is more reliable.

[0061] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the antifreeze water system 100 also includes an air intake valve 85, which is connected to the connecting pipe 84 and is located at the highest point of the antifreeze water system 100. When draining water, it can ensure that the pressure in the water system is balanced with the external pressure, so that the water system can drain water smoothly.

[0062] In some embodiments of the present invention, the volume of the antifreeze liquid storage tank 7 is the same as the volume of the antifreeze water system 100 between the first control valve 21 and the second control valve 81. It can be understood that the accumulated water in the water system is accumulated between the first control valve 21 and the second control valve 81 of the antifreeze water system 100, and the volume of the antifreeze liquid storage tank 7 is roughly equivalent to the volume of the accumulated water in the water system, so that the antifreeze liquid and the accumulated water in the water system can be fully mixed, and the accumulated water can be prevented from freezing under low temperature conditions as much as possible, and the accumulated water can be prevented from expanding and damaging other components in the water system.

[0063] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the second antifreeze valve 5 is located below the first water inlet 111. The water pump 83 is located above the heat exchanger 1, at least part of the second water pipe 8 is located above the first water pipe 2, and the second antifreeze valve 5 is located below the first water inlet 111, so that the water in the water pump 83 and the heat exchanger 1 can be completely discharged, so that the water system flows through the second antifreeze valve 5 when it is discharged through the drain pipe 3, so that the accumulated water in the antifreeze water system 100 can be fully mixed with the antifreeze liquid at the second antifreeze valve 5, which can avoid the freezing of accumulated water under low temperature conditions as much as possible, and avoid the expansion of accumulated water to damage other components in the water system.

[0064] An antifreeze water system 100 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings. It is worth noting that the following description is merely exemplary and is intended to be used to explain the present invention, but is not to be construed as limiting the present invention.

[0065] like Figure 1 and Figure 2 As shown, the antifreeze water system 100 according to an embodiment of the present invention includes a heat exchanger 1, a first water pipe 2, a drain pipe 3, a first antifreeze valve 4, a second antifreeze valve 5, an antifreeze liquid connecting pipe 6, an antifreeze liquid storage tank 7, a control module, an alarm device, a second water pipe 8, an expansion tank 82, a water pump 83, a connecting pipe 84 and an intake valve 85.

[0066] like Figure 1 , Figure 2 and Figure 5 As shown, the connection relationship of the antifreeze water system 100 can be: one end of the second water pipe 8 is connected to the second water port 112, and the second water pipe 8 is provided with a second control valve 81. The first water port 111 is the water outlet, the second water port 112 is the water inlet, the first water port 111 is located below the second water port 112, and the second water pipe 8 is located above the first water pipe 2. When the water system works normally, the second water pipe 8 can be used as a water inlet pipe to feed water into the water inlet of the heat exchanger 1. After the water exchanges heat inside the heat exchanger 1, it flows out of the water outlet and flows to the first water pipe 2, and flows toward the user's water use position. The second water pipe 8 is located at a higher position, which can make the flow of water from the water inlet to the water outlet of the water system simpler, making the flow process of the water system more reliable.

[0067] A two-way valve and an expansion tank 82 are sequentially arranged on the second water pipe 8. The two-way valve can control the connection and disconnection between the second water pipe 8 of the water system and the user's water-using side. The second control valve 81 is an electric control valve, and the two-way valve is a normally closed type. When the water system is powered on, the two-way valve is opened, and water is passed through the second water pipe 8 of the water system and the pipeline on the user's water-using side; after the water system is powered off, the two-way valve is closed, and the second water pipe 8 of the water system and the pipeline on the user's water-using side are cut off. The expansion tank 82 is connected to the second water pipe 8. During the heat exchange process of the water system, after the water absorbs heat, the expansion tank 82 is used to withstand the pressure of the water body expansion, which can avoid the explosion and other failures of the water system due to the expansion of the water body, thereby increasing the reliability of the water system.

[0068] One end of the second water pipe 8 is connected to one of the inlet and the outlet of the water pump 83, one end of the connecting pipe 84 is connected to the other of the inlet and the outlet of the water pump 83, and the other end is connected to the second water port 112. It can be understood that the first water port 111 is a water outlet, the second water port 112 is a water inlet, one end of the second water pipe 8 is connected to the inlet of the water pump 83, one end of the connecting pipe 84 is connected to the outlet of the water pump 83, and the other end of the connecting pipe 84 is connected to the second water port 112. The water pump 83 can provide power for the water inlet of the heat exchanger 1, so that the water inlet process of the heat exchanger 1 is more reliable.

[0069] The air inlet valve 85 is connected to the connecting pipe 84 and is located at the highest point of the antifreeze water system 100. When draining water, it can ensure that the pressure inside the water system is balanced with the external pressure, so that the water system can drain water smoothly.

[0070] The heat exchanger 1 has a first heat exchange flow path 11 and a second heat exchange flow path 12. The heat exchanger 1 is a water-fluorine plate heat exchanger 1. The first heat exchange flow path 11 can be a water flow path, and the second heat exchange flow path 12 can be a fluorine system flow path. The first heat exchange flow path 11 and the second heat exchange flow path 12 transfer heat between the plates of the heat exchanger 1 to achieve heating or cooling of the water in the heat exchanger 1. The first heat exchange flow path 11 has a first water inlet 111 and a second water inlet 112. The first water inlet 111 and the second water inlet 112 can achieve water circulation in the first heat exchange flow path 11 in the heat exchanger 1. The first water inlet 111 is a water outlet, and the second water inlet 112 is a water inlet. The first water inlet 111 is located below the second water inlet 112, which can make the process of water flowing from the second water inlet 112 to the first water inlet 111 relatively simple, making the flow process of the water system relatively simple.

[0071] The heat exchanger 1 is connected to the first water pipe 2, and the first water pipe 2 is also provided with a first control valve 21, a first antifreeze valve 4 and a drain pipe 3, and the drain pipe 3 is also provided with a second antifreeze valve 5 and an antifreeze liquid connecting pipe 6. The on-off of the first water pipe 2 can be controlled by controlling the on-off of the first control valve 21, and the process of the first water pipe 2 supplying water to the first heat exchange flow path 11 can be controlled, or the process of the water outflow of the first heat exchange flow path 11 can be controlled, so that the flow of the first heat exchange flow path 11 is more controllable. The first control valve 21 is a one-way valve, which can make the water in the first water pipe 2 that has been heat exchanged by the heat exchanger 1 flow to the user's water use position, which can prevent the water on the user side from flowing back into other parts of the water system through the first water pipe 2, and can better reduce the accumulation of water in the water system.

[0072] The antifreeze storage tank 7 is connected to the end of the antifreeze connection pipe 6 away from the drain pipe 3. The antifreeze storage tank 7 is used to store antifreeze, and when the antifreeze storage is insufficient, antifreeze can be added to the antifreeze storage tank 7 to ensure that the antifreeze in the water system is sufficient. A liquid level switch 71 is arranged in the antifreeze storage tank 7. The liquid level switch 71 can detect the liquid level of the antifreeze in the antifreeze storage tank 7, and can better monitor the storage status of the antifreeze, avoid the freezing of water accumulation in the water system due to lack of antifreeze, and avoid the expansion of accumulated water to damage other components in the water system.

[0073] One end of the drain pipe 3 is connected to the first water pipe 2 and is located on a side of the first control valve 21 near the first water outlet 111. When the water system is closed, water may accumulate in the first water pipe 2. The drain pipe 3 is located below the first water pipe 2. The accumulated water can be discharged from the first water pipe 2 through the drain pipe 3 to avoid freezing of accumulated water under low temperature conditions and to avoid expansion of accumulated water and damage to other components in the water system.

[0074] The first antifreeze valve 4 has a first channel 41 and a second channel 42 which are separated from each other. The first channel 41 is connected in series to the first water pipe 2 and is located on the side of the drain pipe 3 close to the first water inlet 111. The first channel 41 is a water channel, and the second channel 42 is an antifreeze channel. In the first antifreeze valve 4, water and antifreeze are completely separated, which can prevent the antifreeze from entering the first channel 41, prevent the antifreeze from entering the first water pipe 2, and prevent the corrosion of metal materials in the water system due to oxidation of the antifreeze. The second antifreeze valve 5 has a third channel 51, one end of the third channel 51 is connected to the end of the drain pipe 3 away from the first water pipe 2, and the second channel 42 and the third channel 51 have valve cores, which are configured to open when the temperature is lower than a preset temperature. The first channel 41 and the second channel 42 can conduct heat, and the temperature of the water in the first channel 41 is used to control the opening and closing of the valve core. One end of the antifreeze connecting pipe 6 is connected to the drain pipe 3, and the second channel 42 is connected in series to the antifreeze connecting pipe 6. When the temperature of the water in the first channel 41 is lower than the preset temperature, the valve core opens, and the antifreeze flows through the second channel 42 and flows to the third channel 51 of the second antifreeze valve 5. The water discharged through the drain pipe 3 is mixed with the antifreeze in the third channel 51, so that the freezing point of the mixed liquid is reduced to below 0°C, thereby avoiding ice blockage at the water outlet of the second antifreeze valve 5 due to the low ambient temperature, avoiding drainage failure, and ensuring that the water retained in the water system can be discharged smoothly.

[0075] The volume of the antifreeze liquid storage tank 7 is the same as the volume of the antifreeze water system 100 between the first control valve 21 and the second control valve 81. The accumulated water in the water system is accumulated between the first control valve 21 and the second control valve 81 of the antifreeze water system 100. The volume of the antifreeze liquid storage tank 7 is roughly equivalent to the volume of the accumulated water in the water system, so that the antifreeze liquid and the accumulated water in the water system can be fully mixed, and the accumulated water can be prevented from freezing under low temperature conditions as much as possible, and the accumulated water can be prevented from expanding and damaging other components in the water system.

[0076] The antifreeze liquid is ethylene glycol, and the first antifreeze valve 4 and the second antifreeze valve 5 are mechanical low-temperature antifreeze drain valves. The second antifreeze valve 5 is located at the lowest point of the antifreeze water system 100. When the water system is discharged through the drain pipe 3, it flows through the second antifreeze valve 5, so that the accumulated water in the antifreeze water system 100 can be fully mixed with the antifreeze liquid at the second antifreeze valve 5, which can avoid the freezing of accumulated water under low-temperature conditions as much as possible, and avoid the expansion of accumulated water to damage other components in the water system. When the temperature of the water in the first channel 41 drops below 3°C, the valve core opens to drain; when the temperature of the water in the first channel 41 drops below 1°C, the valve core is fully opened, and the antifreeze water system 100 is fully opened to drain.

[0077] After the water system is turned on, the order of opening the water system is to open the two-way valve and start the water pump 83; when the water system is powered on and running, driven by the water pump 83, water enters the heat exchanger 1 from the second water pipe 8, exchanges heat with the fluorine system 13, and then is discharged through the first water pipe 2; Figure 6 As shown, after the water system is shut down, the water pump 83 is shut down, and the two-way valve is closed; water will remain in the water system and flow to the first water pipe 2.

[0078] When the drainage is completed, the water system is powered on again, and the water system circulates normally, the water temperature rises to above 3°C, and the second channel 42 of the first antifreeze valve 4 is closed, which can prevent the antifreeze from entering the first channel 41, the antifreeze from entering the first water pipe 2, and the corrosion of metal materials in the water system due to the oxidation of the antifreeze. In addition, the low-temperature antifreeze will not enter the second antifreeze valve 5, and the second antifreeze valve 5 can also be closed, and the purpose of stopping drainage is finally achieved. The antifreeze water system 100 also includes a control module and an alarm device. The liquid level switch 71 is connected to the control module, and the alarm device is connected to the control module. The alarm device is configured to alarm when the liquid level switch 71 detects that the liquid level is lower than a preset value. When the liquid level switch 71 detects that the liquid level is lower than a preset value, the liquid level switch 71 is turned on. When the water system is started, the liquid level switch 71 transmits a signal to the control module, and the control module controls the alarm device to issue an alarm, prompting the user to add antifreeze to ensure that the antifreeze in the water system is sufficient.

[0079] According to an embodiment of the present invention, the heat pump unit includes a shell and the above-mentioned antifreeze water system, and the heat exchanger and the antifreeze tank are arranged in the shell. The shell can protect the heat exchanger and the antifreeze tank and try to avoid the heat exchanger and the antifreeze tank from being hit.

[0080] According to the heat pump unit of the embodiment of the present invention, the first channel 41 of the first antifreeze valve 4 is connected in series to the first water pipe 2 and is located on the side of the drain pipe 3 close to the first water inlet 111, one end of the third channel 51 of the second antifreeze valve 5 is connected to the end of the drain pipe 3 away from the first water pipe 2, the second channel 42 of the first antifreeze valve 4 and the third channel 51 of the second antifreeze valve 5 are provided with valve cores, the first channel 41 and the second channel 42 can conduct heat, and the opening and closing of the valve core are controlled by the temperature of the water in the first channel 41, one end of the antifreeze liquid connecting pipe 6 is connected to the drain pipe 3, and the second channel 42 is connected to the drain pipe 3. The first channel 42 is connected in series to the antifreeze connecting pipe 6. When the temperature of the water in the first channel 41 is lower than the preset temperature, the valve core of the second channel 42 is opened, the valve core of the third channel 51 is opened, the antifreeze flows through the second channel 42 and flows to the third channel 51 of the second antifreeze valve 5. The water discharged through the drain pipe 3 is mixed with the antifreeze in the third channel 51, so that the freezing point of the mixed liquid is reduced, thereby avoiding ice blockage of the water outlet of the second antifreeze valve 5 due to the low ambient temperature, avoiding drainage failure, ensuring that the water retained in the water system can be discharged smoothly, and avoiding damage to the heat pump unit due to low temperature freezing.

[0081] The control method of the heat pump unit according to the embodiment of the present invention includes the above-mentioned heat pump unit. The control method of the heat pump unit includes: obtaining the water temperature in the first channel 41 and the ambient temperature of the second antifreeze valve 5, and timely monitoring the water temperature in the first channel 41 and the ambient temperature of the second antifreeze valve 5 to prevent the antifreeze water system 100 of the heat pump unit from not responding when the water temperature or ambient temperature is too low, to prevent water from freezing under low temperature conditions, and to prevent water from expanding and damaging other components in the antifreeze water system 100; when the water temperature is lower than the set temperature, the second channel 42 is turned on, and the antifreeze liquid can flow out of the second channel 42; when the ambient temperature is lower than the preset ... When the temperature is high, the second antifreeze valve 5 is turned on, and the water discharged through the drain pipe 3 is mixed with the antifreeze liquid in the third channel 51, so that the freezing point of the mixed liquid is reduced to below 0°C, thereby avoiding ice blockage at the water outlet of the second antifreeze valve 5 due to the low ambient temperature, avoiding drainage failure, and ensuring that the water retained in the antifreeze water system 100 can be drained smoothly; wherein, the water temperature in the antifreeze water system 100 may be higher than the ambient temperature, and the set temperature is greater than or equal to the preset temperature, which can avoid ice blockage at the water outlet of the second antifreeze valve 5 due to the low ambient temperature when the second channel 42 is opened.

[0082] According to the control method of the heat pump unit of the embodiment of the present invention, the first channel 41 of the first antifreeze valve 4 is connected in series to the first water pipe 2 and is located on the side of the drain pipe 3 close to the first water inlet 111, one end of the third channel 51 of the second antifreeze valve 5 is connected to the end of the drain pipe 3 away from the first water pipe 2, the second channel 42 of the first antifreeze valve 4 and the third channel 51 of the second antifreeze valve 5 have valve cores, the first channel 41 and the second channel 42 can conduct heat, and the opening and closing of the valve core are controlled by using the temperature of the water in the first channel 41, and one end of the antifreeze liquid connecting pipe 6 is connected to the drain pipe 3 away from the first water pipe 2. Connected to the drain pipe 3, the second channel 42 is connected in series to the antifreeze connecting pipe 6. When the temperature of the water in the first channel 41 is lower than the preset temperature, the valve core of the second channel 42 opens, the valve core of the third channel 51 opens, the antifreeze flows through the second channel 42, and flows to the third channel 51 of the second antifreeze valve 5. The water discharged through the drain pipe 3 is mixed with the antifreeze in the third channel 51, so that the freezing point of the mixed liquid is reduced, thereby avoiding ice blockage at the water outlet of the second antifreeze valve 5 due to the low ambient temperature, avoiding drainage failure, and ensuring that the water retained in the water system can be discharged smoothly.

[0083] In some embodiments of the present invention, the antifreeze water system also includes a second water pipe 8, a first control valve 21 and a second control valve 81, one end of the second water pipe 81 is connected to the second water outlet 112, the second water pipe 8 is provided with a second control valve 81, the first control valve 21 is arranged in the first water pipe 2, and the end of the drain pipe 3 connected to the first water pipe 2 is located between the first control valve 21 and the first water outlet 111. The control method of the heat pump unit includes: when the heat pump unit is shut down or powered off, controlling the second control valve 81 to be cut off, and controlling the first control valve 21 to prevent the water in the first water pipe 2 from flowing to the heat exchanger 1.

[0084] It is understandable that when the heat pump unit is shut down or powered off, the second control valve 81 cuts off the second water pipe 8, and the second water pipe 8 no longer supplies water to the heat exchanger 1. The first control valve 21 cuts off the first water pipe 2, which can prevent the water in the first water pipe 2 from flowing to the heat exchanger 1.

[0085] Other structures and operations of the antifreeze water system 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0087] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An antifreeze water system, characterized in that: include: A heat exchanger, wherein the heat exchanger has a first heat exchange flow path, the first heat exchange flow path has a first water inlet and a second water inlet, and the first water inlet is located below the second water inlet; a first water pipe, one end of which is connected to a first water outlet; a drain pipe, one end of which is connected to the first water pipe, and the drain pipe is located below the first water pipe; a first antifreeze valve, the first antifreeze valve having a first channel and a second channel separated from each other, the first channel being serially connected to the first water pipe and located at a side of the drain pipe close to the first water outlet, the first antifreeze valve being configured to control the on-off of the second channel according to the water temperature in the first channel; a second antifreeze valve, the second antifreeze valve having a third channel, one end of the third channel being connected to an end of the drain pipe away from the first water pipe, the second channel and the third channel having valve cores therein, the valve cores being configured to open when the temperature is lower than a preset temperature; an antifreeze connecting pipe, one end of which is connected to the drain pipe, and the second channel is serially connected to the antifreeze connecting pipe; An antifreeze liquid storage tank is connected to an end of the antifreeze liquid connecting pipe away from the drain pipe.

2. The antifreeze water system according to claim 1, characterized in that: The antifreeze water system is provided with a liquid level switch in the antifreeze liquid storage tank; the antifreeze water system further comprises: A control module, the liquid level switch is connected to the control module; An alarm device is connected to the control module and is configured to sound an alarm when the liquid level switch detects that the liquid level is lower than a preset value.

3. The antifreeze water system according to claim 1, characterized in that: The first water inlet is a water outlet, and the second water inlet is a water inlet; Alternatively, the first water inlet is a water inlet, and the second water inlet is a water outlet.

4. The antifreeze water system according to claim 1, characterized in that: The antifreeze water system includes a first control valve, which is arranged in the first water pipe, and one end of the drain pipe connected to the first water pipe is located between the first control valve and the first water outlet.

5. The antifreeze water system according to claim 4, characterized in that: The antifreeze water system also includes: A second water pipe and a second control valve, wherein one end of the second water pipe is connected to a second water outlet, the second water pipe is provided with the second control valve, and at least a portion of the second water pipe is located above the first water pipe.

6. The antifreeze water system according to claim 5, characterized in that: The antifreeze water system also includes: An expansion tank is connected to the second water pipe.

7. The antifreeze water system according to claim 5, characterized in that: The antifreeze water system also includes: a water pump, wherein one end of the second water pipe is connected to one of an inlet and an outlet of the water pump; A connecting pipe, one end of which is connected to the other of the inlet and the outlet of the water pump, and the other end of which is connected to the second water outlet, and the second water pipe is indirectly connected to the second water outlet through the water pump and the connecting pipe.

8. The antifreeze water system according to claim 7, characterized in that: The antifreeze water system also includes: An air intake valve is connected to the connecting pipe and is located at the highest point of the antifreeze water system.

9. The antifreeze water system according to claim 5, characterized in that: The volume of the antifreeze liquid storage tank is the same as the volume of the antifreeze water system between the first control valve and the second control valve.

10. The antifreeze water system according to claim 1, characterized in that: The second antifreeze valve is located below the first water inlet.

11. A heat pump unit, characterized in that: include: case; According to the antifreeze water system according to any one of claims 1-10, the heat exchanger and the antifreeze liquid storage tank are arranged in the shell.

12. A control method for a heat pump unit, characterized in that: The heat pump unit according to claim 11, wherein the control method of the heat pump unit comprises: Acquiring the water temperature in the first channel and the ambient temperature of the second antifreeze valve; When the water temperature is lower than the set temperature, the second channel is turned on; When the ambient temperature is lower than a preset temperature, the second antifreeze valve is turned on; Wherein, the set temperature is greater than or equal to the preset temperature.

13. The control method of the heat pump unit according to claim 12, characterized in that: The antifreeze water system further includes a second water pipe, a first control valve and a second control valve, one end of the second water pipe is connected to a second water port, the second water pipe is provided with the second control valve, the first control valve is arranged in the first water pipe, and one end of the drain pipe connected to the first water pipe is located between the first control valve and the first water port, and the control method of the heat pump unit includes: When the heat pump unit is shut down or powered off, the second control valve is controlled to be cut off, and the first control valve is controlled to prevent the water in the first water pipe from flowing to the heat exchanger.

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