Heat pump unit

Abstract

The utility model discloses a heat pump unit, and relates to the technical field of heat pump systems. The heat pump unit comprises a machine shell and a heat pump assembly, the heat pump assembly comprises an evaporator and a plurality of heating pipes, the evaporator comprises a shell and a plurality of heat exchange pipes arranged in the shell, and the heat exchange pipes are arranged side by side; the heating pipes are arranged in the shell and used for providing heat for the heat exchange pipes so as to remove frost attached to the evaporator. The heating pipe and the heat exchange pipe are arranged side by side; in the defrosting process, the heating pipe is powered on to provide heat for the heat exchange pipe so as to melt frost, and then the defrosting effect is achieved; in the defrosting process, the evaporator can work normally, so that the heat pump unit can operate normally; shutdown operation is not needed in the defrosting process, so that the heat pump unit can normally supply heat in the working process; the heating pipe and the heat exchange pipe are arranged side by side, so that heat of the heating pipe can be transmitted to the heat exchange pipe in time to ensure that frost on the surface of the heat exchange pipe can be melted.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat pump systems, and specifically relates to a heat pump unit. Background Technology

[0002] When a heat pump unit is operating in heating mode, the temperature of the evaporator surface also drops, sometimes even below 0°C. When outdoor air flows into the evaporator driven by a fan, the moisture in the air precipitates and adheres to the evaporator surface, forming a frost layer. Currently, the most common defrosting method is through a four-way valve reversing defrosting. When frost forms on the evaporator, the compressor needs to be shut off, and then the four-way valve is reversed to switch the operation of the evaporator and condenser. Then the compressor is turned on again, and the evaporator begins to release heat, melting the frost. Once the frost has melted, the compressor is shut off again, and the four-way valve is reversed to restore the evaporator and condenser to their original operation. However, during the defrosting process, the heat pump unit cannot operate normally. Utility Model Content

[0003] The purpose of this utility model is to provide a heat pump unit to solve one or more technical problems existing in the prior art.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0005] This utility model embodiment provides a heat pump unit, including:

[0006] chassis;

[0007] A heat pump assembly is installed in the housing; the heat pump assembly includes an evaporator and a plurality of heating tubes, the evaporator includes a housing and a plurality of heat exchange tubes disposed inside the housing, the plurality of heat exchange tubes being arranged side by side;

[0008] Multiple heating tubes are disposed inside the housing and are used to provide heat to the heat exchange tubes to remove frost attached to the evaporator; the heating tubes and the heat exchange tubes are arranged side by side.

[0009] According to the heat pump unit of this utility model embodiment, a plurality of heat exchange tubes are arranged to form a heat exchange layer, and at least two heat exchange layers are provided, and at least two heat exchange layers are arranged along the thickness direction of the evaporator; the heating tube is disposed on the outside of the heat exchange layer, and the heating tube is located between two adjacent heat exchange tubes.

[0010] According to an embodiment of the present invention, a heat pump unit has multiple heating tubes arranged to form a heating layer, and the heat exchange layer and the heating layer are arranged along the direction from the inside to the outside of the casing.

[0011] According to an embodiment of the present invention, in a heat pump unit, the evaporator forms at least one sidewall of the casing.

[0012] According to the heat pump unit of this utility model embodiment, there are two evaporators, which are respectively arranged on opposite sides of the casing.

[0013] According to an embodiment of the present invention, the heat pump unit further includes a connecting pipe, a compressor, and a liquid tank. The connecting pipe, the compressor, and the liquid tank are disposed inside the housing. The connecting pipe sequentially connects the liquid tank, the evaporator, and the compressor to form a refrigerant flow channel.

[0014] According to an embodiment of the present invention, the heat pump unit further includes an external condenser, which is disposed outside the housing and communicates with the flow channel.

[0015] According to an embodiment of the present invention, the heat pump unit has a connecting wall in the casing and a connecting joint in the flow channel, the connecting joint being installed on the connecting wall; the flow channel is connected to the external condenser through the connecting joint. According to an embodiment of the present invention, the heat pump unit has two heat pump components arranged side-by-side.

[0016] According to an embodiment of the present invention, the heat pump unit further includes a fan, which is disposed on the top of the casing.

[0017] The heat pump unit according to the embodiment of this utility model

[0018] The present invention has at least the following beneficial effects:

[0019] During defrosting, the heating element is powered on to provide heat to the heat exchange tube to melt the frost, thus achieving the defrosting effect. During the defrosting process, the evaporator can operate normally, allowing the heat pump unit to operate normally. No shutdown operation is required during defrosting, allowing the heat pump unit to provide heat normally during operation. The heating element and heat exchange tube are arranged side by side, so that the heat from the heating element can be transferred to the heat exchange tube in a timely manner, ensuring that the frost on the surface of the heat exchange tube can melt. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0021] Figure 1 This is a schematic diagram of the overall structure of the heat pump unit provided in this embodiment of the utility model;

[0022] Figure 2 This is a top view of the heat pump unit provided in this embodiment of the utility model;

[0023] Figure 3 yes Figure 2 Cross-sectional view of AA in the middle;

[0024] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0025] Figure 5 This is a schematic diagram of the internal structure of the heat pump unit provided in this embodiment of the utility model.

[0026] The following labels are shown in the attached diagram:

[0027] 100. Housing; 110. Connecting wall; 111. Connecting joint; 120. Fan;

[0028] 200. Heat pump components;

[0029] 300, Evaporator; 310, Shell; 320, Heat exchange layer; 321, Heat exchange tube;

[0030] 400. Heating layer; 410. Heating tube;

[0031] 500. Connecting pipes;

[0032] 600. Compressor;

[0033] 700, liquid tank;

[0034] 800. Gas-liquid separator;

[0035] 900, four-way valve. Detailed Implementation

[0036] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0037] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, the use of terms such as "several" means one or more, with "multiple" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the sequential relationship between indicated technical features.

[0039] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0040] When a heat pump unit is operating in heating mode, the temperature of the evaporator surface also drops, sometimes even below 0°C. When outdoor air flows into the evaporator driven by a fan, the moisture in the air precipitates and adheres to the evaporator surface, forming a frost layer. Currently, the most common defrosting method is through a four-way valve reversing defrosting. When frost forms on the evaporator, the compressor needs to be shut off, and then the four-way valve is reversed to switch the operation of the evaporator and condenser. Then the compressor is turned on again, and the evaporator begins to release heat, melting the frost. Once the frost has melted, the compressor is shut off again, and the four-way valve is reversed to restore the evaporator and condenser to their original operation. However, during the defrosting process, the heat pump unit cannot operate normally.

[0041] Reference Figures 1 to 5 The following are several embodiments of the heat pump unit of this utility model.

[0042] like Figures 1 to 5 As shown, the heat pump unit of this utility model embodiment includes a housing 100 and a heat pump assembly 200, which is installed in the housing 100. The heat pump assembly 200 includes an evaporator 300 and a plurality of heating tubes 410. The evaporator 300 includes a housing 310 and a plurality of heat exchange tubes 321 disposed inside the housing 310, which are arranged side by side. The plurality of heating tubes 410 are disposed inside the housing 310 and are used to provide heat to the heat exchange tubes 321 to remove frost attached to the evaporator 300. The heating tubes 410 and the heat exchange tubes 321 are arranged side by side.

[0043] During defrosting, the heating element 410 is energized to provide heat to the heat exchange tube 321 to melt the frost, thereby achieving the defrosting effect. During the defrosting process, the evaporator 300 can operate normally, allowing the heat pump unit to operate normally. No shutdown operation is required during the defrosting process, allowing the heat pump unit to provide heat normally during operation. The heating element 410 and the heat exchange tube 321 are arranged side by side, so that the heat from the heating element 410 can be transferred to the heat exchange tube 321 in a timely manner, ensuring that the frost on the surface of the heat exchange tube 321 can melt.

[0044] The evaporator 300 also includes a bend connecting two adjacent heat exchange tubes 321. The heating tube 410 and heat exchange tubes 321 are arranged side-by-side, ensuring that different positions along the length of the heat exchange tubes 321 can receive heat from the heating tube 410. The heating tube 410 includes a tube body and a heating element, which is disposed inside the tube body. The heating element generates heat when energized; typically, the heating element can be a nickel-chromium alloy wire. The heating tube 410 may also include insulating material to prevent short circuits between the heating element and the tube body or other metal parts.

[0045] In some embodiments, such as Figure 4 As shown, multiple heat exchange tubes 321 are arranged to form a heat exchange layer 320. At least two heat exchange layers 320 are provided, and these at least two heat exchange layers 320 are arranged along the thickness direction of the evaporator 300 to increase the contact area between the heat exchange tubes 321 and the environment, thereby improving the heat exchange effect. A heating tube 410 is disposed on the outside of the heat exchange layer 320, and the heating tube 410 is located between two adjacent heat exchange tubes 321. Generally, heat exchange tubes 321 closer to the outer side of the casing 100 are more prone to frost buildup. Placing the heating tube 410 on the outside of the heat exchange layer 320 is more conducive to thoroughly removing frost from the evaporator 300. The heating tube 410 is located between two adjacent heat exchange tubes 321 to increase the heat exchange effect between the heating tube 410 and the heat exchange tubes 321, thereby improving defrosting efficiency. Two adjacent heat exchange layers 320 are connected. Three heat exchange layers 320 can be provided. Of course, in other embodiments, the number of heat exchange layers 320 can be set according to actual needs, and this embodiment of the present invention does not impose a particular limitation on this.

[0046] In some embodiments, such as Figure 4 As shown, multiple heating tubes 410 are arranged to form a heating layer 400. The heat exchange layer 320 and the heating layer 400 are arranged along the direction from the inside to the outside of the housing 100. Generally, the frost layer is formed on the outside of the heat exchange tube 321. The heating layer 400 can provide heat to the heat exchange tube 321 from the outside of the heat exchange layer 320, reducing the impact of external cold air on the heat exchange tube 321 during the defrosting process, thereby improving the defrosting efficiency.

[0047] In some embodiments, such as Figure 3As shown, the evaporator 300 forms at least one sidewall of the casing 100, exposing the evaporator 300 to the environment. This facilitates heat exchange between the evaporator 300 and the environment, thereby improving the heating efficiency of the heat pump unit. Using the evaporator 300 as a sidewall of the casing 100 reduces the material used in the casing 100, thus reducing production costs. Furthermore, since the evaporator 300 is a sidewall of the casing 100, no additional space needs to be reserved inside the casing 100 to accommodate it, which is beneficial for the miniaturization of the heat pump unit. The casing 100 includes a frame, and the evaporator 300 is mounted on the frame to form a sidewall of the casing 100.

[0048] In some embodiments, such as Figure 3 As shown, two evaporators 300 are provided, and the two evaporators 300 are correspondingly arranged on opposite sides of the casing 100. Air can flow between the outer and inner sides of the casing 100 through the evaporators 300, which helps air enter the casing 100 from different directions, forming a convective airflow, promoting a more uniform airflow inside the casing 100, and improving heat exchange efficiency. In other words, the two opposite side walls of the casing 100 are the evaporators 300.

[0049] In some embodiments, such as Figure 3 and Figure 5 As shown, the heat pump assembly 200 also includes a connecting pipe 500, a compressor 600, and a liquid tank 700. The connecting pipe 500, compressor 600, and liquid tank 700 are disposed inside the housing 100. The housing 100 provides a physical barrier for the connecting pipe 500, compressor 600, and liquid tank 700 to prevent external dust and other impurities from affecting the connecting pipe 500, compressor 600, and liquid tank 700. The connecting pipe 500 sequentially connects the liquid tank 700, evaporator 300, and compressor 600 to form a refrigerant flow channel.

[0050] In some embodiments, the heat pump assembly 200 further includes an external condenser connected to the flow channel; the evaporator 300 exchanges heat with the environment, and the refrigerant absorbs heat in the evaporator 300 to form a low-temperature, low-pressure gaseous refrigerant; the low-temperature, low-pressure gaseous refrigerant flows to the compressor 600, where it is compressed to form a high-temperature, high-pressure gaseous refrigerant, which then flows into the liquid tank 700 for storage. The refrigerant in the liquid tank 700 flows to the external condenser, where the high-temperature, high-pressure refrigerant releases heat and condenses into a liquid refrigerant. An expansion valve is also provided in the flow channel, located between the evaporator 300 and the external condenser. The refrigerant liquid changes from a high-pressure liquid state to a low-pressure liquid state through the expansion valve before entering the evaporator 300.

[0051] The liquid tank 700 is a device used to store and supply the refrigerant liquid required by the heat pump unit, and can hold a certain amount of refrigerant liquid. When there is too much refrigerant liquid in the heat pump unit, the liquid tank 700 can absorb the excess liquid to prevent the heat pump unit from becoming too pressurized; when there is insufficient refrigerant liquid in the heat pump unit, the liquid tank 700 can release the stored liquid to replenish the heat pump unit's needs and maintain the stable operation of the heat pump unit.

[0052] like Figure 5 As shown, the heat pump assembly 200 also includes a gas-liquid separator 800, which is disposed on the flow channel; the inlet of the gas-liquid separator 800 is connected to the evaporator 300, and the outlet is connected to the compressor 600. The gas-liquid separator 800 is a device for separating gas and liquid mixtures to prevent liquid refrigerant from entering the compressor 600.

[0053] like Figure 5 As shown, the heat pump assembly 200 also includes a four-way valve 900, which has a first inlet, a first outlet, a second inlet, and a second outlet. The first inlet is connected to the gas-liquid separator 800, the first outlet is connected to the compressor 600, the second inlet is connected to the compressor 600, and the second outlet is connected to the liquid tank 700.

[0054] In some embodiments, an external condenser is disposed outside the housing 100, allowing the external condenser to heat a target object; the external condenser includes a heat exchanger that can surround the oil passage to prevent the oil passage from freezing. The heat pump unit transfers heat from a low-temperature environment to the oil passage through an efficient heat exchange process, thereby preventing the oil passage from freezing.

[0055] In some embodiments, the housing 100 has a connecting wall 110, and the flow channel has a connecting connector 111, which is mounted on the connecting wall 110. The flow channel is connected to an external condenser through the connecting connector 111. The connecting connector 111 is mounted on the connecting wall 110, allowing the user to quickly determine the position of the connecting connector 111, facilitating communication between the external condenser and the flow channel, so that the refrigerant can flow into the external condenser. Generally, the connecting wall 110 is a plate.

[0056] In some embodiments, two heat pump components 200 are provided, arranged side by side. By having both heat pump components 200 work simultaneously, the heating efficiency of the heat pump unit can be improved, as well as the flexibility and redundancy of the heat pump unit. By using both heat pump components 200 to work together, a greater heat output can be achieved. If one heat pump component 200 fails, the other can continue to work, thereby ensuring that the operation of the heat pump unit is not affected.

[0057] In some embodiments, such as Figure 1As shown, the heat pump unit also includes a fan 120. The fan 120 can accelerate the airflow inside the casing 100, which is more conducive to the evaporator 300 absorbing heat from the environment. The fan 120 is located on the top of the casing 100, reducing the space occupied by the fan 120, thereby reducing the floor space of the heat pump unit. Two fans 120 can be installed; two fans 120 can increase the airflow and improve the heat exchange efficiency.

[0058] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A heat pump unit, characterized in that, include: Casing (100); A heat pump assembly (200) is installed in the housing (100); the heat pump assembly (200) includes an evaporator (300) and a plurality of heating tubes (410), the evaporator (300) includes a housing (310) and a plurality of heat exchange tubes (321) disposed inside the housing (310), the plurality of heat exchange tubes (321) being arranged side by side; Multiple heating tubes (410) are disposed inside the housing (310) and are used to provide heat to the heat exchange tube (321) to remove frost attached to the evaporator (300); the heating tubes (410) and the heat exchange tube (321) are arranged side by side.

2. The heat pump unit according to claim 1, characterized in that, Multiple heat exchange tubes (321) are arranged to form a heat exchange layer (320), and at least two heat exchange layers (320) are provided, and at least two heat exchange layers (320) are provided along the thickness direction of the evaporator (300); the heating tube (410) is provided on the outside of the heat exchange layer (320), and the heating tube (410) is located between two adjacent heat exchange tubes (321).

3. The heat pump unit according to claim 2, characterized in that, Multiple heating tubes (410) are arranged to form a heating layer (400), and the heat exchange layer (320) and the heating layer (400) are arranged along the direction from the inside to the outside of the housing (100).

4. The heat pump unit according to claim 1, characterized in that, The evaporator (300) forms at least one sidewall of the housing (100).

5. The heat pump unit according to claim 4, characterized in that, There are two evaporators (300), which are respectively arranged on opposite sides of the housing (100).

6. The heat pump unit according to any one of claims 1 to 5, characterized in that, The heat pump assembly (200) also includes a connecting pipe (500), a compressor (600), and a liquid tank (700). The connecting pipe (500), the compressor (600), and the liquid tank (700) are disposed inside the housing (100). The connecting pipe (500) sequentially connects the liquid tank (700), the evaporator (300), and the compressor (600) to form a refrigerant flow channel.

7. The heat pump unit according to claim 6, characterized in that, The heat pump assembly (200) also includes an external condenser, which is disposed outside the housing (100) and communicates with the flow channel.

8. The heat pump unit according to claim 7, characterized in that, The housing (100) has a connecting wall (110), and the flow channel has a connecting joint (111), which is installed on the connecting wall (110); the flow channel is connected to the external condenser through the connecting joint (111).

9. The heat pump unit according to any one of claims 1 to 5, characterized in that, There are two heat pump components (200), which are arranged side by side.

10. The heat pump unit according to any one of claims 1 to 5, characterized in that, The heat pump unit also includes a fan (120), which is disposed on the top of the housing (100).

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