A heat exchanger for an outdoor unit of an air source heat pump air conditioner with a wide temperature range

Abstract

The utility model relates to a wide temperature range air source heat pump air conditioner outdoor unit heat exchanger, which solves the problem that the existing wide temperature range air source heat pump cannot be quickly and effectively defrosted in winter and the engine cylinder liner heat cannot be effectively utilized. It includes a shell, a heat exchanger pipeline arranged in the shell, and a fan. The shell is provided with an air inlet corresponding to the heat exchange pipeline. The heat exchanger pipeline includes more than one first heat exchanger pipeline and a second heat exchanger pipeline for passing a refrigerant medium. The first heat exchanger pipeline and the second heat exchanger pipeline are arranged crosswise. The antifreeze inlet of the second heat exchanger is connected to the antifreeze outlet after the heat exchange of the engine cylinder liner through a defrost valve. In this way, the cylinder liner heat of the engine is fully utilized, and the engine cylinder liner heat is converted through the second heat exchanger for reliable defrosting, which not only fully utilizes energy, but also solves the problem of winter defrosting, and improves the operating performance of the wide temperature range air source heat pump in winter. In addition, through the integrated design of the first heat exchanger pipeline and the second heat exchanger pipeline, the structure is compact and convenient for installation and layout.

Description

Technical Field

[0001] The utility model relates to a heat exchanger for an outdoor unit of an air source heat pump air conditioner with a wide temperature range. Background Art

[0002] Wide temperature range air source heat pump air conditioner is an environmentally friendly and energy-saving air conditioning system. It uses natural gas as energy and realizes the functions of cooling in summer and heating in winter through heat pump circulation. In addition, it can also efficiently recover engine waste heat for comprehensive utilization, greatly improving energy utilization efficiency.

[0003] In this system, the wide temperature range air source heat pump air conditioner outdoor unit heat exchanger is an important part of the heat pump air conditioning system. Its main working principle is to exchange heat with the air through fins to achieve the purpose of cooling or heating. This method can not only meet people's demand for indoor temperature, but also because of its high efficiency and energy saving characteristics, it is also loved by the majority of users.

[0004] However, wide temperature range air source heat pumps are more commonly used in low temperature environments in the north, but they cannot be defrosted quickly and effectively in winter, which has become the main reason affecting the performance of wide temperature range air source heat pumps. In order to solve this problem, the common defrosting method is mainly to defrost by refrigerant reverse hot gas bypass or switch the four-way valve for hot gas reverse flow defrosting, but this will greatly reduce the user experience.

[0005] In addition, during the operation of the wide temperature range air source heat pump, in addition to the heat exchanger on the refrigerant side, the engine will generate a large amount of cylinder liner heat and flue gas waste heat. When this heat exceeds a certain temperature, it also needs to be dissipated through the fin heat exchanger. This makes the layout and installation of the wide temperature range air source heat pump air conditioner outdoor unit heat exchanger difficult.

[0006] Therefore, studying an effective method for the heat exchanger of the outdoor unit of a wide temperature range air source heat pump air conditioner is of great significance for improving the operating efficiency of the wide temperature range air source heat pump. This can not only solve the defrosting problem of the wide temperature range air source heat pump in winter, but also optimize the layout and installation of the heat exchanger, thereby improving the operating efficiency of the entire system. Utility Model Content

[0007] The utility model aims to solve the problem that the existing wide temperature range air source heat pump cannot be defrosted quickly and effectively in winter and the heat of the engine cylinder liner cannot be effectively utilized.

[0008] The technical solution adopted to solve the technical problems raised by the utility model is as follows: the heat exchanger of the outdoor unit of the wide temperature range air source heat pump air conditioner of the utility model includes a shell, a heat exchanger pipeline arranged in the shell, and a fan arranged on the shell for sucking air outside the shell into the heat exchange pipeline to exchange air with the air in the shell. An air inlet is provided on the shell corresponding to the heat exchange pipeline, and it is characterized in that: the heat exchanger pipeline includes more than one first heat exchanger pipeline for introducing a refrigerant medium and more than one second heat exchanger pipeline for introducing an antifreeze liquid. The first heat exchanger pipeline and the second heat exchanger pipeline are arranged crosswise, and the antifreeze liquid inlet of the second heat exchanger is connected to the antifreeze liquid outlet after heat exchange between the antifreeze liquid and the engine cylinder liner through a defrost valve.

[0009] The technical solutions further defining the utility model include:

[0010] The defrost valve is a solenoid valve. A first temperature sensor for detecting the actual temperature between the first heat exchanger pipelines is arranged inside the shell. A second temperature sensor for detecting the ambient temperature is arranged outside the shell.

[0011] The refrigerant medium is Freon.

[0012] The second heat exchanger pipeline includes a group of pipeline monomers, which are composed of more than two U-shaped tubes parallel to each other and semicircular tubes respectively connecting two adjacent U-shaped tubes, and the two adjacent U-shaped tubes are staggered.

[0013] The first heat exchanger pipeline includes two groups of pipeline monomers, the two groups of pipeline monomers are arranged side by side, and the two groups of pipeline monomers are connected by a Y-shaped three-way pipe.

[0014] The U-shaped tube and the semicircular tube are both provided with fins.

[0015] A heat exchanger pipeline is provided on both sides of the shell, namely a left heat exchanger pipeline and a right heat exchanger pipeline. The corresponding heat exchanger pipelines on both sides of the shell are respectively provided with a left air inlet and a right air inlet. The fan is arranged on the top of the shell and located between the two heat exchanger pipelines.

[0016] The antifreeze inlet of the second heat exchanger of the left heat exchanger pipeline, the antifreeze inlet of the second heat exchanger of the right heat exchanger pipeline and the antifreeze outlet after heat exchange of the engine cylinder sleeve are connected through a three-way pipe.

[0017] The three-way pipe is Y-shaped or T-shaped.

[0018] There are more than two fans, and the more than two fans are evenly arranged in the area between the two heat exchangers.

[0019] Through the above technical scheme, the beneficial effects of the utility model are as follows: the heat exchanger pipeline of the heat exchanger of the outdoor unit of the wide temperature range air source heat pump air conditioner of the utility model includes one or more first heat exchanger pipelines for introducing refrigerant medium and one or more second heat exchanger pipelines for introducing antifreeze, the first heat exchanger pipeline and the second heat exchanger pipeline are arranged crosswise, and the antifreeze inlet of the second heat exchanger is connected with the antifreeze outlet after heat exchange of the engine cylinder liner through the defrost valve, thereby making full use of the cylinder liner heat of the engine, and reliably defrosting the cylinder liner heat of the engine after conversion through the second heat exchanger, which not only makes full use of energy, but also solves the problem of defrosting in winter, and improves the operating performance of the wide temperature range air source heat pump in winter. In addition, through the integrated design of the first heat exchanger pipeline and the second heat exchanger pipeline, the structure is compact and easy to install and arrange. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a heat exchanger for an outdoor unit of an air source heat pump air conditioner with a wide temperature range according to the utility model.

[0021] Figure 2 The utility model is a schematic structural diagram of a heat exchanger pipeline of an outdoor unit heat exchanger of an air source heat pump air conditioner with a wide temperature range.

[0022] Figure 3 for Figure 2 Schematic diagram of the structure at H in the figure.

[0023] Figure 4 It is a structural schematic diagram of a U-shaped tube of a heat exchanger of an outdoor unit of an air source heat pump air conditioner with a wide temperature range according to the utility model.

[0024] Figure 5 It is a structural schematic diagram of a semicircular tube of a heat exchanger of an outdoor unit of an air source heat pump air conditioner with a wide temperature range according to the utility model.

[0025] Figure 6 The utility model is a schematic structural diagram of a Y-shaped three-way pipe of a heat exchanger of an outdoor unit of an air source heat pump air conditioner with a wide temperature range. DETAILED DESCRIPTION

[0026] The structure of the utility model is further described below in conjunction with the accompanying drawings.

[0027] Reference Figures 1 to 6A heat exchanger for an outdoor unit of a wide temperature range air source heat pump air conditioner includes a housing 1, a heat exchanger pipeline 2 arranged in the housing, and a fan 3 arranged on the housing for sucking air outside the housing into the heat exchange pipeline for exchanging air with the air in the housing. The housing 1 is provided with an air inlet 11 corresponding to the heat exchange pipeline, and the air inlet is a mesh arranged on both sides of the housing. The heat exchanger pipeline 2 includes more than one first heat exchanger pipeline 21 for passing a refrigerant medium and more than one second heat exchanger pipeline 22 for passing an antifreeze liquid. The first heat exchanger pipeline and the second heat exchanger pipeline are arranged crosswise, and the antifreeze liquid inlet of the second heat exchanger is connected to the antifreeze liquid outlet after heat exchange of the engine cylinder liner through a defrost valve 4. When in use, air is first sucked in from the outside of the shell through the fan, and then passes through the first heat exchanger. The first heat exchanger exchanges heat with the air to achieve energy transfer. When the first heat exchanger is heating in winter, if the temperature difference between the inside and outside of the shell is relatively large, the defrost valve is opened, and the antifreeze after heat exchange with the engine cylinder sleeve flows into the second heat exchanger pipeline for heat exchange and defrosting. In this way, the cylinder sleeve heat of the engine is fully utilized, and the cylinder sleeve heat of the engine is converted through the second heat exchanger for reliable defrosting, which not only fully utilizes energy, but also solves the problem of winter defrosting, and improves the operating performance of the wide temperature range air source heat pump in winter. In addition, through the integrated design of the first heat exchanger pipeline and the second heat exchanger pipeline, the structure is compact and easy to install and arrange.

[0028] In this embodiment, the refrigerant is Freon. Other refrigerants may be used as required in the specific implementation.

[0029] In this embodiment, the defrost valve 4 is a solenoid valve, a first temperature sensor 5 for detecting the actual temperature between the first heat exchanger pipelines is provided inside the housing, and a second temperature sensor 6 for detecting the ambient temperature is provided outside the housing. When the temperature difference between the second temperature sensor and the first temperature sensor is greater than or equal to 10 degrees and lasts for 60 seconds, the solenoid valve opens, and the antifreeze after heat exchange with the engine cylinder liner flows in from the antifreeze inlet, thereby achieving the defrosting effect. When the temperature difference between the second temperature sensor and the first temperature sensor is less than or equal to 3 degrees, the refrigerant in the first heat exchanger is prevented from being higher than the ambient temperature, resulting in reverse heat absorption.

[0030] In this embodiment, the first heat exchanger pipeline 21 includes a group of pipeline monomers 7, which are composed of two or more U-shaped tubes 71 parallel to each other and semicircular tubes 72 respectively connecting two adjacent U-shaped tubes, and the two adjacent U-shaped tubes are staggered. Figure 2 The first heat exchanger pipeline is provided with 7 groups, namely A, B, C, D, E, F and G. In this embodiment, the second heat exchanger pipeline 22 includes two groups of pipeline monomers 7, the two groups of pipeline monomers are arranged side by side, and the two groups of pipeline monomers are connected by a Y-shaped three-way pipe 8. Figure 2The second heat exchanger pipeline is provided with 7 groups, each group includes 2 groups of pipeline monomers 7, namely Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ, Ⅵ and Ⅶ. Fins are provided on the U-shaped tube and the semicircular tube, so that energy exchange can be fully carried out between the pipelines.

[0031] In this embodiment, a heat exchanger pipeline 2 is provided on both sides of the shell, namely a left heat exchanger pipeline 201 and a right heat exchanger pipeline 202. The corresponding heat exchanger pipelines on both sides of the shell 1 are respectively provided with a left air inlet 111 and a right air inlet 112. The left air inlet 111 and the right air inlet 112 are mesh holes provided on the two side walls of the shell. The fan 3 is arranged at the top of the shell and located between the two heat exchanger pipelines. Thereby, the heat exchange efficiency is improved, and the overall layout is compact and easy to install. In this embodiment, two fans are provided, and the two fans are evenly arranged in the area between the two heat exchangers. In the specific implementation, more than two fans can be evenly arranged in the area between the two heat exchangers as needed. Thereby, the heat exchange efficiency is improved. The first temperature sensor of the left heat exchanger pipeline and the first temperature sensor of the right heat exchanger pipeline respectively detect the actual temperature between the first heat exchanger pipelines on both sides and take a minimum value. When the temperature difference between the second temperature sensor and the lowest value of the first temperature sensor is greater than or equal to 10 degrees and lasts for 60 seconds, the solenoid valve opens, and the antifreeze after heat exchange with the engine cylinder liner will flow in from the antifreeze inlet, thereby achieving the defrosting effect. When the temperature difference between the second temperature sensor and the lowest value of the first temperature sensor is less than or equal to 3 degrees, the refrigerant in the first heat exchanger is prevented from being higher than the ambient temperature, resulting in reverse heat absorption.

[0032] In this embodiment, the antifreeze inlet of the second heat exchanger of the left heat exchanger pipeline, the antifreeze inlet of the second heat exchanger of the right heat exchanger pipeline and the antifreeze outlet of the cylinder liner of the engine are connected by a tee. The tee is Y-shaped or T-shaped. Thus, the heat exchangers on both sides can be defrosted as needed.

[0033] Although the specific implementation of the utility model is described in detail in conjunction with the drawings, it should not be understood as limiting the protection scope of the utility model. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still belong to the protection scope of the utility model.

Claims

1. A heat exchanger for an outdoor unit of a wide temperature range air source heat pump air conditioner, comprising a housing, a heat exchanger pipeline arranged in the housing, and a fan arranged on the housing for sucking air outside the housing into the heat exchange pipeline to exchange air with the air in the housing, wherein an air inlet is arranged on the housing corresponding to the heat exchange pipeline, and characterized in that: The heat exchanger pipeline includes one or more first heat exchanger pipelines for introducing refrigerant and one or more second heat exchanger pipelines for introducing antifreeze. The first heat exchanger pipeline and the second heat exchanger pipeline are arranged crosswise, and the antifreeze inlet of the second heat exchanger is connected to the antifreeze outlet after heat exchange between the antifreeze and the engine cylinder liner through a defrost valve.

2. A wide temperature range air source heat pump air conditioner outdoor unit heat exchanger as claimed in claim 1, characterized in that: The defrost valve is a solenoid valve. A first temperature sensor for detecting the actual temperature between the first heat exchanger pipelines is arranged inside the shell. A second temperature sensor for detecting the ambient temperature is arranged outside the shell.

3. A wide temperature range air source heat pump air conditioner outdoor unit heat exchanger as claimed in claim 1, characterized in that: The refrigerant medium is Freon.

4. A wide temperature range air source heat pump air conditioner outdoor unit heat exchanger as claimed in claim 1, characterized in that: The second heat exchanger pipeline includes a group of pipeline monomers, which are composed of more than two U-shaped tubes parallel to each other and semicircular tubes respectively connecting two adjacent U-shaped tubes, and the two adjacent U-shaped tubes are staggered.

5. A wide temperature range air source heat pump air conditioner outdoor unit heat exchanger as claimed in claim 4, characterized in that: The first heat exchanger pipeline includes two groups of pipeline monomers, the two groups of pipeline monomers are arranged side by side, and the two groups of pipeline monomers are connected by a Y-shaped three-way pipe.

6. A wide temperature range air source heat pump air conditioner outdoor unit heat exchanger as claimed in claim 5, characterized in that: The U-shaped tube and the semicircular tube are both provided with fins.

7. A wide temperature range air source heat pump air conditioner outdoor unit heat exchanger as claimed in claim 1, characterized in that: A heat exchanger pipeline is provided on both sides of the shell, namely a left heat exchanger pipeline and a right heat exchanger pipeline. The corresponding heat exchanger pipelines on both sides of the shell are respectively provided with a left air inlet and a right air inlet. The fan is arranged on the top of the shell and located between the two heat exchanger pipelines.

8. A wide temperature range air source heat pump air conditioner outdoor unit heat exchanger as claimed in claim 7, characterized in that: The antifreeze inlet of the second heat exchanger of the left heat exchanger pipeline, the antifreeze inlet of the second heat exchanger of the right heat exchanger pipeline and the antifreeze outlet after heat exchange of the engine cylinder sleeve are connected through a three-way pipe.

9. A wide temperature range air source heat pump air conditioner outdoor unit heat exchanger as claimed in claim 8, characterized in that: The three-way pipe is Y-shaped or T-shaped.

10. A wide temperature range air source heat pump air conditioner outdoor unit heat exchanger as claimed in claim 7, characterized in that: There are more than two fans, and the more than two fans are evenly arranged in the area between the two heat exchangers.

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