Heat pump water heater capable of preventing water pan from freezing

Abstract

The utility model discloses a heat pump water heater capable of preventing a water pan from freezing. The heat pump water heater comprises a compressor, a four-way valve, a first heat exchanger and a second heat exchanger. Four ports of the four-way valve communicate with an inlet of the compressor, an outlet of the compressor, one port of the first heat exchanger and one port of the second heat exchanger correspondingly, and the first heat exchanger communicates with the second heat exchanger. The first heat exchanger is provided with a water receiving disc, an anti-freezing pipe is arranged in the water receiving disc, and two ports of the anti-freezing pipe are both communicated with a pipeline between the first heat exchanger and the second heat exchanger; and the two electromagnetic valves are respectively mounted at two ports of the anti-freezing pipe. In low-temperature weather, the high-pressure and high-temperature refrigerant coming out of the sleeve is at least 30 DEG C or even higher, it is guaranteed that condensate water cannot be frozen, the supercooling degree of the refrigerant is increased, and the running reliability of a unit system is also improved; the scheme is easy to implement, low in cost and good in effect, the value of the water pan is more highlighted in low-temperature northern areas, and it is guaranteed that the water pan never freezes.

Description

Technical Field

[0001] The utility model relates to the field of low-temperature heat pump water heaters, in particular to a heat pump water heater capable of preventing a water receiving pan from freezing. Background Art

[0002] As the country's requirements for low carbon are getting higher and higher, many heating and hot water supply equipment have been carbon-free, and gradually turned to the use of electricity, solar energy and air energy. Among them, air energy is relatively energy-saving and reliable, and the popularity of air energy in northern China is also increasing. However, the harsh and changeable weather in the north has brought challenges to the reliable operation of air energy. One of the more important points is that air energy will be defrosted during operation. The condensed water produced by defrosting will accumulate into ice in the local part of the unit. Even with the increase of running time, the ice produced will accumulate and spread to the evaporator, freezing and cracking the evaporator and affecting the reliable operation of the unit. Although some manufacturers have added electric heating to the water tray, the power of electric heating is far from enough. Therefore, a reliable and effective method to prevent the water tray from freezing is needed.

[0003] The prior art with the publication number CN208704225U discloses a system for removing ice from the chassis of the outdoor unit of the heat pump system. The working process is as follows: when ice forms on the water receiving tray of the outdoor unit of the heat pump system, it is necessary to remove the ice. That is, the superheated refrigerant vapor after compression by the compressor is divided into two paths after passing through the four-way reversing valve. One path provides the required heat to the indoor through the indoor unit condenser. The refrigerant liquid coming out of the condenser is throttled by the throttle valve, and absorbs heat with the outdoor unit evaporator, and then flows back to the compressor again after passing through the four-way reversing valve to complete the winter heating cycle. The other path of refrigerant vapor flows through the solenoid valve and enters the heat exchanger 2 for heat exchange. The refrigerant vapor with a lowered temperature after heat exchange is merged with the refrigerant before flowing through the condenser through the pipeline, and flows into the condenser together. In the heat exchanger 2, the liquid after heat exchange with the superheated refrigerant vapor is passed through the pipeline provided with a water pump to the coil on the upper part of the water receiving tray to release heat. At this time, the ice layer that has absorbed heat melts into water, and the defrosted water flows out through the water outlet at the bottom of the water receiving pan and flows into the heat exchanger 1, where it exchanges heat with the refrigerant liquid coming out of the condenser to supercool the refrigerant. After absorbing heat, the defrosted water flows through the pipeline to the pipeline set at the bottom of the water receiving pan, and melts the ice layer in the water receiving pan together with the superheated steam discharged from the compressor. After the heat exchange, the defrosted water, whose temperature drops again, flows out through the drain port.

[0004] The above-mentioned prior art requires three heat exchangers to work, and the defrosting requires an external power source to realize the evaporator defrosting action, which makes the structure of the prior art more complicated and the cost higher. Utility Model Content

[0005] In order to solve the problem of complex unit structure in the prior art, the purpose of the utility model is to provide a heat pump water heater that prevents the water receiving pan from freezing. The heat pump water heater has a simpler structure and can further dissipate the heat of the refrigerant to reduce supercooling, thereby increasing the degree of supercooling and the reliability of the unit system operation.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a heat pump water heater for preventing a water receiving pan from freezing, comprising a compressor, a four-way valve, a first heat exchanger and a second heat exchanger; the four ports of the four-way valve are respectively connected to the inlet of the compressor, the outlet of the compressor, a port of the first heat exchanger and a port of the second heat exchanger, and the first heat exchanger and the second heat exchanger are connected to each other; the first heat exchanger is provided with a water receiving pan, and an antifreeze pipe is provided in the water receiving pan, and the two ports of the antifreeze pipe are both connected to the pipeline between the first heat exchanger and the second heat exchanger; two solenoid valves are respectively installed at the two ports of the antifreeze pipe.

[0007] Preferably, a gas-liquid separator is installed on the pipeline connecting the four-way valve and the compressor inlet.

[0008] Preferably, the first heat exchanger is an evaporator.

[0009] Preferably, the second heat exchanger is a shell and tube heat exchanger.

[0010] Preferably, an electronic expansion valve is installed on the pipeline between the antifreeze pipe and the first heat exchanger.

[0011] Preferably, an axial flow fan is installed at the first heat exchanger.

[0012] Preferably, the antifreeze pipe is a copper pipe.

[0013] Preferably, the antifreeze pipe is fixed in the water receiving tray by a pipe clamp.

[0014] Preferably, the water receiving tray is strip-shaped, and the portion of the antifreeze pipe embedded in the water receiving tray is U-shaped.

[0015] The beneficial effects of the technical solution of the utility model are as follows: in low temperature weather, the high-pressure and high-temperature refrigerant coming out of the casing is at least 30°C or even higher, and the condensed water is guaranteed not to freeze when flowing through the water receiving tray; the internal refrigerant of the antifreeze pipe that dissipates heat in the water receiving tray further dissipates the heat and cools down, thereby increasing the degree of supercooling and the reliability of the operation of the unit system; the above solution is easy to implement, low in cost, and has good effects, and its value is more prominent in the low-temperature north, ensuring that the water receiving tray will never freeze. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the schematic diagram of a heat pump water heater.

[0017] Figure numerals: 1. compressor; 2. gas-liquid separator; 3. second heat exchanger; 4. four-way valve; 5. first heat exchanger; 6. motor; 7. fan blade; 8. electronic expansion valve; 9. solenoid valve; 10. antifreeze pipe. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, and examples of the embodiments 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] 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", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection 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.

[0022] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Example

[0023] like Figure 1 The heat pump water heater for preventing a water receiving pan from freezing is shown, comprising a compressor 1, a four-way valve 4, a first heat exchanger 5 and a second heat exchanger 3. The four ports of the four-way valve 4 are respectively connected to the inlet of the compressor 1, the outlet of the compressor 1, a port of the first heat exchanger 5 and a port of the second heat exchanger 3, and the first heat exchanger 5 and the second heat exchanger 3 are connected to each other; the first heat exchanger 5 is provided with a water receiving pan, and an antifreeze pipe 10 is provided in the water receiving pan, and both ports of the antifreeze pipe 10 are connected to the pipeline between the first heat exchanger 5 and the second heat exchanger 3; and an electromagnetic valve 9 is installed on the antifreeze pipe 10.

[0024] With this arrangement, in low-temperature weather, the high-pressure and high-temperature refrigerant coming out of the casing is at least 30°C or even higher, and the condensed water will not freeze when flowing through the water tray; the antifreeze pipe that dissipates heat in the water tray will further dissipate the heat and overcool the refrigerant, increasing the degree of supercooling and the reliability of the unit system operation. The above solution is easy to implement, low in cost, and has good effects. Its value is more prominent in the low-temperature north, ensuring that the water tray will never freeze.

[0025] In this embodiment, two solenoid valves 9 are respectively installed at two ports of the antifreeze pipe 10. In this way, the two sets of solenoid valves 9 can effectively control the refrigerant flow in the antifreeze pipe 10 to ensure the effective operation of the unit.

[0026] In this embodiment, a gas-liquid separator 2 is installed on the pipeline connecting the four-way valve 4 and the inlet of the compressor 1 .

[0027] In this embodiment, an electronic expansion valve 8 is installed on the pipeline between the antifreeze pipe 10 and the first heat exchanger 5 .

[0028] In this embodiment, the antifreeze pipe 10 is a copper pipe, and the antifreeze pipe 10 is fixed in the water receiving tray by screws and pipe clamps.

[0029] In this embodiment, the water receiving tray is strip-shaped, and the part of the antifreeze pipe 10 embedded in the water receiving tray is U-shaped. Further, the diameter of the U-shaped copper pipe is φ12.7.

[0030] In this embodiment, the first heat exchanger 5 is an evaporator, an axial flow fan is installed at the first heat exchanger 5, and the axial flow fan includes a motor 6 and a fan blade 7; the second heat exchanger 3 is a shell and tube heat exchanger.

[0031] The control method of the heat pump water heater is as follows:

[0032] Determine whether to open the solenoid valve 9 according to the outdoor ambient temperature; specifically, in this embodiment, the set temperature is -7°C, and if the current ambient temperature is less than -7°C, the solenoid valve 9 is opened;

[0033] After the solenoid valve 9 is opened, the high-temperature and high-pressure gaseous refrigerant coming out of the compressor 1 becomes a medium-temperature liquid refrigerant after passing through the first heat exchanger 5. Part of the medium-temperature liquid refrigerant enters the antifreeze pipe 10 and completes heat exchange with the water receiving pan. The refrigerant that has completed heat exchange enters the second heat exchanger 3 to complete heat exchange again and then returns to the compressor 1.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", 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 utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A heat pump water heater that prevents the water tray from freezing. Features: It comprises a compressor (1), a four-way valve (4), a first heat exchanger (5) and a second heat exchanger (3); The four ports of the four-way valve (4) are respectively connected to the inlet of the compressor (1), the outlet of the compressor (1), a port of the first heat exchanger (5), and a port of the second heat exchanger (3); the first heat exchanger (5) and the second heat exchanger (3) are connected to each other; The first heat exchanger (5) is provided with a water receiving pan, an antifreeze pipe (10) is provided in the water receiving pan, and both ends of the antifreeze pipe (10) are connected to the pipeline between the first heat exchanger (5) and the second heat exchanger (3); The two solenoid valves (9) are respectively installed at two ports of the antifreeze pipe (10).

2. A heat pump water heater for preventing the water receiving pan from freezing according to claim 1, Features: A gas-liquid separator (2) is installed on the pipeline connecting the four-way valve (4) and the inlet of the compressor (1).

3. A heat pump water heater for preventing the water receiving pan from freezing according to claim 1, Features: The first heat exchanger (5) is an evaporator.

4. A heat pump water heater for preventing the water tray from freezing according to claim 1, Features: The second heat exchanger (3) is a shell and tube heat exchanger.

5. A heat pump water heater for preventing the water tray from freezing according to claim 1, Features: An electronic expansion valve (8) is installed on the pipeline between the antifreeze pipe (10) and the first heat exchanger (5).

6. A heat pump water heater for preventing the water tray from freezing according to claim 1, Features: An axial flow fan is installed at the first heat exchanger (5).

7. A heat pump water heater for preventing the water tray from freezing according to claim 1, Features: The antifreeze pipe (10) is a copper pipe.

8. A heat pump water heater for preventing the water receiving pan from freezing according to claim 1, Features: The antifreeze pipe (10) is fixed in the water receiving tray by a pipe clamp.

9. A heat pump water heater for preventing the water receiving pan from freezing according to claim 1, Features: The water receiving tray is strip-shaped, and the portion of the antifreeze pipe (10) embedded in the water receiving tray is U-shaped.

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