Micro-channel heat exchanger

Abstract

The utility model discloses a microchannel heat exchanger which comprises a plurality of heat exchange pipes used for medium flowing heat exchange and collecting pipes arranged at the two ends of the heat exchange pipes and used for medium gathering and conveying, the collecting pipes comprise the first collecting pipe used for medium gathering and inputting and the second collecting pipe used for medium gathering and outputting, and the heat exchange pipes are arranged in multiple rows in parallel. A micro-channel for medium circulation is arranged in the heat exchange pipe, and the two ends of the heat exchange pipe are connected with a first collecting pipe and a second collecting pipe correspondingly so that the micro-channel in the heat exchange pipe can communicate with the first collecting pipe and the second collecting pipe correspondingly. According to the micro-channel heat exchanger, the multiple rows of heat exchange pipes are directly arranged, media enter from the first collecting pipe on one side and exit from the second collecting pipe on the other side, an external pipeline does not need to be arranged, flow resistance is small, and heat exchange efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange, and specifically relates to a microchannel heat exchanger. Background Art

[0002] In recent years, microchannel heat exchangers have been widely used in heat exchange systems, and their heat exchange efficiency is improved by their tiny channel area and large surface area in contact with air. To further improve the heat exchange efficiency of existing microchannel heat exchangers, they are set as double-row heat exchangers, and there are the following two forms of the setting structure between the double-row heat exchangers: First, two independent heat exchangers are connected in series through an external pipeline; Second, the heat exchange flat tubes are connected in series, one side of the double-row heat exchanger is set as a V shape, and the other side is two header pipes. However, the heat exchangers with the above two structures have the following defects: the size of the heat exchanger is increased, the pipeline process becomes complex, the flow resistance is increased, and the heat exchange effect becomes poor; At the same time, the overall structure of the heat exchanger becomes complex and it is not convenient for installation and fixation.

[0003] In view of this, the present utility model is specifically proposed. Content of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, optimize the structure of the microchannel heat exchanger, while reducing the structural flow resistance and improving the heat exchange efficiency, avoid complicating the heat exchange structure, and at the same time make the heat exchange structure convenient for installation and fixation. Therefore, the present utility model provides a microchannel heat exchanger.

[0005] The basic idea of the technical solution adopted by the present utility model to solve the above technical problems is:

[0006] A microchannel heat exchanger includes a plurality of heat exchange tubes for heat exchange of medium flow and header pipes arranged at both ends of the heat exchange tubes for medium aggregation and transportation. The header pipes include a first header pipe for medium aggregation input and a second header pipe for medium aggregation output. The heat exchange tubes are arranged in parallel multiple rows, and microchannels for medium circulation are arranged inside the heat exchange tubes. Both ends of the heat exchange tubes are respectively connected to the first header pipe and the second header pipe so that the microchannels inside the heat exchange tubes are respectively communicated with the first header pipe and the second header pipe.

[0007] Further, there are two rows of heat exchange tubes arranged in parallel. The two rows of heat exchange tubes include a first heat exchange tube and a second heat exchange tube, and the first heat exchange tube and the second heat exchange tube are arranged parallel to each other.

[0008] Further, both ends of the heat exchange tubes are respectively inserted and connected to the first header pipe and the second header pipe.

[0009] Further, the first heat exchange tube and the second heat exchange tube are arranged in parallel, and the first heat exchange tube and the second heat exchange tube are independent of each other and do not communicate with each other.

[0010] Further, the first heat exchange tube and the second heat exchange tube are straight tube structures with a flat cross-section.

[0011] Further, one or more micro-channels are provided on each heat exchange tube.

[0012] Further, the cross-sectional shape of the micro-channel is any one of a circle, a square, an ellipse, and a polygon, and each micro-channel extends along the axial direction of the corresponding heat exchange tube body.

[0013] Further, the end face of the header pipe is an elliptical structure.

[0014] Further, a liquid inlet is provided on the first header pipe. The liquid inlet is an externally convex tube structure and is connected to and detachably connected to the first header pipe.

[0015] Further, a liquid outlet is provided on the second header pipe. The liquid outlet is an externally convex tube structure and is connected to and detachably connected to the second header pipe.

[0016] After adopting the above technical solution, compared with the prior art, the present utility model has the following beneficial technical effects:

[0017] By directly arranging multiple rows of heat exchange tubes, the medium enters from the first header pipe on one side and exits from the second header pipe on the other side, without the need to arrange external pipelines, resulting in small flow resistance and high heat exchange efficiency;

[0018] The header pipe is designed as a tube structure with an elliptical cross-section, increasing the heat exchange area, reducing the flow resistance, and improving the heat exchange effect;

[0019] The overall structure of the heat exchanger is simple, facilitating installation and saving the installation space inside the air conditioner.

[0020] The following further describes in detail the specific embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0021] The accompanying drawings, as a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0022] In the accompanying drawings:

[0023] Figure 1 is the overall structure diagram of the micro-channel heat exchanger in the present utility model;

[0024] Figure 2 is the top view schematic diagram of the micro-channel heat exchanger in the present utility model.

[0025] Icons: 1. First manifold; 2. Second manifold; 3. Liquid inlet; 4. Liquid outlet; 5. First heat exchange tube; 6. Second heat exchange tube; 7. Mounting support.

[0026] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounting", "connecting" and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] The present utility model provides a microchannel heat exchanger, which is applied to the heat exchange system in an air conditioner to perform heat exchange with the outside world for refrigeration or heating.

[0031] As Figure 1-2 shown, a microchannel heat exchanger includes a plurality of heat exchange tubes for medium flow and heat exchange, and manifolds provided at both ends of the heat exchange tubes for medium aggregation and transportation. The manifolds include a first manifold 1 for medium aggregation input and a second manifold 2 for medium aggregation output. The heat exchange tubes are arranged in parallel multi-rows, and microchannels for medium flow are provided inside the heat exchange tubes. Both ends of the heat exchange tubes are respectively connected to the first manifold 1 and the second manifold 2 so that the microchannels inside the heat exchange tubes are respectively communicated with the first manifold 1 and the second manifold 2.

[0032] It should be noted that the liquid inlet 3 and the liquid outlet 4 of the microchannel heat exchanger can be arranged on the same manifold or separately on two manifolds. For example, the liquid inlet 3 and the liquid outlet 4 can be arranged on the first manifold 1, or as shown in the appendix Figure 1 the liquid inlet 3 is arranged on the first manifold 1 and the liquid outlet 4 is arranged on the second manifold 2. The liquid inlet 3, the first manifold 1, the heat exchange tubes, the second manifold 2, and the liquid outlet 4 are connected to form a heat exchange flow path.

[0033] Specifically, the first manifold 1 is provided with a liquid inlet 3. The liquid inlet 3 is of an externally convex tube structure and is connected to and detachably connected to the first manifold 1.

[0034] The second manifold 2 is provided with a liquid outlet 4. The liquid outlet 4 is of an externally convex tube structure and is connected to and detachably connected to the second manifold 2.

[0035] Furthermore, throttle valves for regulating and controlling the fluid flow rate are provided on the first manifold 1 and the second manifold 2.

[0036] Furthermore, the end faces of the manifolds (the first manifold 1 and the second manifold 2) are of an elliptical structure. Compared with the traditional manifolds with circular end faces, for the manifolds with elliptical end faces, under the same flow rate conditions, due to their larger flow channel width, the friction force when the fluid passes through is reduced, thereby the pipe resistance can be reduced and the operation cost of the equipment can be lowered.

[0037] Furthermore, the size of the elliptical end face of the manifold is 32 mm (minor axis) * 70 mm (major axis), which can meet the requirements of rapid collection and transmission and improve the heat exchange efficiency of the heat exchanger.

[0038] It can be understood that the end face shape of the manifold can also be designed into other shapes according to actual needs, such as any one of a circle, a rectangle, a triangle, a rhombus, a trapezoid, etc., including but not limited to the above several shapes.

[0039] Groove holes for installing the heat exchange tubes and connecting the heat exchange flow paths inside the heat exchange tubes are also provided on the pipe walls of the manifolds. The shape of the groove holes matches the end face shape of the heat exchange tubes. Specifically, the first manifold 1 is provided with first groove holes and the second manifold 2 is provided with second groove holes.

[0040] Exemplarily, a partition may be provided in the first header pipe 1 and / or the second header pipe 2. The partition divides the internal space of the first header pipe 1 and the second header pipe 2 into a plurality of sub-chambers arranged side by side along the length directions of the first header pipe 1 and the second header pipe 2. The sub-chambers of the first header pipe 1 and the second header pipe 2 are connected by heat exchange pipes to form a heat exchange flow path. It can be understood that the "heat exchange flow path" here refers to a path where the refrigerant flows from one header pipe towards the other header pipe in one direction within the microchannel body, constituting a heat exchange flow path. When the same heat exchange flow path is formed by a plurality of parallel microchannels, the heat exchange area can be increased, thereby improving the heat exchange efficiency.

[0041] As an implementable example of the present utility model, a number of heat exchange pipes are installed between the first header pipe 1 and the second header pipe 2. The heat exchange pipes are arranged in two parallel rows. The two rows of heat exchange pipes include a first heat exchange pipe 5 and a second heat exchange pipe 6, and the first heat exchange pipe 5 and the second heat exchange pipe 6 are arranged parallel to each other.

[0042] Furthermore, both ends of the heat exchange pipe are respectively inserted and connected to the first header pipe 1 and the second header pipe 2. Specifically, both ends of the heat exchange pipe are respectively inserted and connected to the first header pipe 1 and the second header pipe 2 through a first slot hole and a second slot hole. This connection structure is convenient for disassembly and installation, does not require complex tools for operation, and is suitable for modular assembly and design.

[0043] Furthermore, the first heat exchange pipe 5 and the second heat exchange pipe 6 are arranged in parallel, and the first heat exchange pipe 5 and the second heat exchange pipe 6 are independent of each other and do not communicate with each other. The first heat exchange pipe 5 and the second heat exchange pipe 6 arranged in parallel double the heat exchange efficiency compared to a single row of heat exchange pipes.

[0044] Compared with the traditional serpentine structure heat exchange pipe or other tortuous structure heat exchange pipes, the first heat exchange pipe 5 and the second heat exchange pipe 6 in the embodiment of the present application are straight pipe structures with a flat cross-section. The straight pipe structure with a flat cross-section has higher heat exchange efficiency and lower pipe resistance. Specifically speaking, the straight pipe structure with a flat cross-section makes it easier for the surrounding fluid to contact the pipe, improving the heat transfer efficiency. And due to the larger flow width of the straight pipe structure with a flat cross-section, the friction force of the fluid passing through is reduced, thereby reducing the pipe resistance and improving the heat transfer effect.

[0045] Furthermore, one or more microchannels are provided on each heat exchange pipe.

[0046] Furthermore, the cross-sectional shape of the microchannel is any one of a circle, a square, an ellipse, and a polygon, and each microchannel extends along the axial direction of the corresponding heat exchange pipe body.

[0047] Exemplarily, one or more microchannels are provided on a single heat exchange tube. When there are multiple microchannels on a single heat exchange tube, the microchannels are evenly spaced and arranged on the single heat exchange tube, so that the microchannels are evenly distributed on the heat exchange tube, increasing the heat transfer specific surface area and facilitating the improvement of the heat transfer efficiency.

[0048] Two adjacent microchannels are independently arranged, so that the two adjacent microchannels do not interfere with each other and independently carry out heat exchange, greatly increasing the convective heat transfer area of the refrigerant.

[0049] The cross-sectional shape of the microchannel can be circular, rectangular, square, oval or polygonal. Each microchannel extends along the axial direction of the heat exchange tube, and several microchannels are arranged in sequence on the heat exchange tube.

[0050] Preferably, in some embodiments of the present application, the cross-sectional shape of the microchannel is oval or circular, which can achieve greater heat transfer in a relatively small volume, thereby improving the heat transfer efficiency. Both ends of the microchannel are connected to the liquid collecting pipe. The refrigerant passes through the first manifold 1 to be distributed to each microchannel in the heat exchange tube, and then the refrigerant is combined through the second manifold 2 to achieve more efficient and stable heat exchange.

[0051] As an implementable example of the present utility model, one or more mounting supports 7 are provided on both the first manifold 1 and the second manifold 2. The mounting support 7 includes a connecting portion and a fixing portion. The connecting portion is used to connect and fix the first manifold 1 and the second manifold 2, and the fixing portion is used for the structural installation and fixation of the whole microchannel heat exchanger.

[0052] Furthermore, in order to improve the stability of installation and fixation, the mounting support 7 is an integrally formed structure.

[0053] Compared with the prior art, the above-mentioned embodiments in the present application have the following beneficial technical effects:

[0054] By directly arranging multiple rows of heat exchange tubes, the medium enters from the first manifold 1 on one side and exits from the second manifold 2 on the other side, without the need to set up external pipelines, with small flow resistance and high heat transfer efficiency;

[0055] The manifold is designed as a tubular structure with an oval cross-section, increasing the heat transfer area, reducing the flow resistance, and improving the heat transfer effect;

[0056] The overall structure of the heat exchanger is simple, easy to install, and saves the installation space inside the air conditioner.

[0057] The above are only the preferred embodiments of the present utility model and do not impose any formal restrictions on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present utility model, can make some changes or modifications using the technical content prompted above to form equivalent embodiments of equivalent changes. The implementation schemes in the above embodiments can also be further combined or replaced. However, as long as the content does not depart from the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the present utility model's solution.

Claims

1. A microchannel heat exchanger, characterized in that: It includes a plurality of heat exchange tubes for medium flow heat exchange and headers arranged at both ends of the heat exchange tubes for medium aggregation and transportation. The headers include a first header for medium aggregation input and a second header for medium aggregation output. The heat exchange tubes are arranged in parallel in multiple rows. Microchannels for medium circulation are arranged in the heat exchange tubes. The two ends of the heat exchange tubes are respectively connected to the first header and the second header so that the microchannels in the heat exchange tubes are connected to the first header and the second header respectively.

2. The microchannel heat exchanger according to claim 1, characterized in that: The heat exchange tubes are arranged in two rows in parallel. The two rows of heat exchange tubes include a first heat exchange tube and a second heat exchange tube. The first heat exchange tube and the second heat exchange tube are arranged in parallel with each other.

3. The microchannel heat exchanger according to claim 2, characterized in that: The first heat exchange tube and the second heat exchange tube are arranged in parallel, and the first heat exchange tube and the second heat exchange tube are independent of each other and do not flow between each other.

4. The microchannel heat exchanger according to claim 3, characterized in that: The first heat exchange tube and the second heat exchange tube are straight tube structures with flat cross sections.

5. The microchannel heat exchanger according to any one of claims 1 to 4, characterized in that: The cross-sectional shape of the microchannel is any one of circular, square, elliptical and polygonal, and each microchannel extends axially along the corresponding heat exchange tube body.

6. The microchannel heat exchanger according to claim 5, characterized in that: Each of the heat exchange tubes is provided with one or more microchannels.

7. The microchannel heat exchanger according to any one of claims 1 to 4, characterized in that: The end surface of the collecting pipe is an elliptical structure.

8. The microchannel heat exchanger according to claim 7, characterized in that: The first collecting pipe is provided with a liquid inlet, which is an outwardly convex tube structure, and is communicated with the first collecting pipe and is detachably connected.

9. The microchannel heat exchanger according to claim 7, characterized in that: The second manifold is provided with a liquid outlet, the liquid outlet is an outwardly convex tube structure, and the liquid outlet is communicated with the second manifold and is detachably connected.

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