CN210833188U

CN210833188U - D-shaped backflow structure of heat exchanger

Info

Publication number: CN210833188U
Application number: CN201921411082.3U
Authority: CN
Inventors: 吕海龙; 虞永亮; 赵延洋
Original assignee: ZHEJIANG SUNCO HEAT EXCHANGE SYSTEM CO Ltd
Current assignee: ZHEJIANG SUNCO HEAT EXCHANGE SYSTEM CO Ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2020-06-23
Anticipated expiration: 2029-08-28

Abstract

The utility model discloses a D type backflow structure of heat exchanger. The device comprises a first flat pipe group, a second flat pipe group, a spacer group, a first D-shaped pipe and a second D-shaped pipe; the first D-shaped pipe and the second D-shaped pipe are provided with a plurality of notches at the same axial position, each spacer of the spacer group is inserted into the notch and the D-shaped pipes are connected in a brazing mode, and the D-shaped pipes are divided into a plurality of independent chambers by the spacers; an overflowing hole is formed between the cavities at the same axial position of the first D-shaped pipe and the second D-shaped pipe and is used for refrigerant communication; the flat pipe of the first flat pipe group is connected with the independent cavity of the first D-shaped pipe in a brazing mode, and the flat pipe of the second flat pipe group is connected with the cavity of the second D-shaped pipe in a brazing mode. The utility model discloses a reflux structure has increased the length of the flat pipe of heat transfer under the prerequisite that does not increase the structure size, makes the cold volume of refrigerant can abundant utilization, has improved the whole heat exchange efficiency of heat exchanger.

Description

D-shaped backflow structure of heat exchanger

Technical Field

The utility model relates to a D type backflow structure of heat exchanger is applicable to microchannel product structure.

Background

In recent years, micro-channel heat exchangers are widely used in various industries due to their high efficiency, compactness, good corrosion resistance and good sustainable development performance.

The micro-channel heat exchanger is designed to meet the development requirement of the electronic industry, and has compact, light and high efficiency structure, and the structure forms of the micro heat exchanger are a flat plate cross flow type heat exchanger and a sintered mesh type porous micro heat exchanger.

The large-scale micro-channel heat exchanger is mainly applied to traditional industrial refrigeration, waste heat utilization, automobile air conditioners, household air conditioners, heat pump water heaters and the like. The structure form of the radiator comprises a parallel flow tube type radiator and a three-dimensional cross flow type radiator. The heat exchanger is a large-scale micro-channel heat exchanger because the external dimension is large and the hydraulic diameter of the micro-channel is less than 0.6-1 mm.

The heat exchange flat tube of the existing micro-channel heat exchanger is mainly of a single-stroke structure, two ends of the heat exchange flat tube are respectively connected with a collecting pipe, a refrigerant flows into an outlet end collecting pipe from an inlet end collecting pipe through the heat exchange flat tube, and a refrigerant uniform distribution device can be arranged in the inlet end collecting pipe so as to enable the refrigerant to be uniformly distributed to enter each heat exchange flat tube. The single-stroke structure in the prior art has the advantages that the space utilization efficiency is low, the flowing path of the heat exchange medium is short, and insufficient heat exchange and low heat exchange efficiency are often shown. If the refrigerant flowing path is increased, the size of the micro-channel heat exchanger needs to be increased, and the micro-channel heat exchanger is not economical and is not convenient to install and apply.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a D type backflow structure of heat exchanger. The microchannel heat exchanger is provided with the backflow structure, the heat exchange flat tubes are provided with multiple layers, and the multilayer heat exchanger is longer in path for heat exchange media to flow through and has more advantages in heat exchange performance. The structure has simple process and compact space, and can provide larger heat exchange area for the core body in limited space.

The technical scheme of the utility model as follows:

a D-shaped reflux structure of a heat exchanger comprises a first flat pipe group, a second flat pipe group, a spacer group, a first D-shaped pipe and a second D-shaped pipe; the first D-shaped pipe and the second D-shaped pipe are arranged in a close fit manner in parallel, a plurality of notches are formed in the same axial position of the first D-shaped pipe and the second D-shaped pipe, each spacer of the spacer set is inserted into the notches in the same position of the first D-shaped pipe and the second D-shaped pipe and is in braze welding connection with the first D-shaped pipe and the second D-shaped pipe, and the first D-shaped pipe and the second D-shaped pipe are divided into a plurality of independent chambers by the spacers;

an overflowing hole is formed between the cavities at the same axial position of the first D-shaped pipe and the second D-shaped pipe and is used for refrigerant communication; the first flat pipe group and the second flat pipe group are composed of a plurality of flat pipes, the flat pipes of the first flat pipe group are all connected with the independent cavities of the first D-shaped pipes in a brazing mode, and the flat pipes of the second flat pipe group are connected with the cavities of the second D-shaped pipes in a brazing mode.

As the utility model discloses a preferred scheme, second flat nest of tubes be the same with first flat nest of tubes structure to in batches processing and backflow structure's fast assembly, the spacer can equidistant evenly distributed also can not equidistant distribution in D type pipe axial.

As the preferred scheme of the utility model, spacer group surface have the brazing filler metal layer, be convenient for carry out brazed connection with first D type pipe and second D type pipe.

As the preferred scheme of the utility model, in order to make the discharge orifice department not weeping, first D type pipe and second D type pipe brazed connection.

As the preferred embodiment of the present invention, the first flat pipe group and the second flat pipe group have a reduced mouth, and can play a role in positioning when the first D-shaped pipe and the second D-shaped pipe are inserted.

The utility model also discloses a heat exchanger, which is characterized in that the heat exchanger comprises a D-shaped reflux structure, a first collecting pipe and a second collecting pipe; the first collecting pipe is connected with the other end of the first flat pipe group in a brazing mode; and the second collecting pipe is connected with the other end of the second flat pipe group in a brazing mode.

As the utility model discloses an optimal scheme, in order to make the more even distribution of refrigerant ability get into each flat pipe, first pressure manifold in be equipped with refrigerant equipartition device.

The utility model discloses a reflux structure has increased the length of the flat pipe of heat transfer under the prerequisite that does not increase the structure size, makes the cold volume of refrigerant can abundant utilization, has improved the whole heat exchange efficiency of heat exchanger. The reflux structure is mainly realized by two D-shaped pipes, the D-shaped pipes are commonly used in the heat exchanger industry, the materials are convenient to obtain, and the processing technology is mature. The D-shaped pipes are divided into a plurality of chambers by partition boards at equal intervals or unequal intervals, and a flow passing hole is formed between the two D-shaped pipes, so that the refrigerant between the chambers corresponding to the two D-shaped pipes can flow. The flat pipes of the first flat pipe group and the second flat pipe group are respectively inserted into the cavities of the D-shaped pipes, so that a backflow structure is formed. The return pipes of the return pipe group are independent, so that the work of a return structure is not influenced even if the return pipe fails, and the fault tolerance rate is high. The utility model discloses a backflow structure technology is ripe, and spare part processing is convenient, can realize the backward flow function from last flat nest of tubes to flat nest of tubes down with succinct structure.

The number of the flat pipes connected with the two independent chambers communicated with the first D-shaped pipe and the second D-shaped pipe can be different, and the number of the flat pipes matched with the independent chambers can be selected according to the required refrigerant mixing effect; when mixing is not required, each independent cavity can be selectively connected with one flat pipe in a brazing mode.

Drawings

Fig. 1 is a schematic structural view of the backflow structure of the present invention;

fig. 2 is a schematic view of the flow direction of the refrigerant in the backflow structure of the present invention;

fig. 3 is a schematic diagram of the spacer of the novel backflow structure of the microchannel heat exchanger of the present invention.

Fig. 4 is a schematic view of the overflowing hole of the novel backflow structure of the microchannel heat exchanger of the present invention.

Fig. 5 is the utility model discloses microchannel heat exchanger's novel backflow structure's flat nest of tubes sketch map is equipped with the aperture in the flat tub for the refrigerant circulation.

Fig. 6 is a schematic view of the microchannel heat exchanger including a D-type backflow structure according to the present invention.

Detailed Description

The invention is further described with reference to the following detailed description and the accompanying drawings.

As shown in fig. 1 and 2, a D-type reflux structure of a heat exchanger includes a first flat tube group 1, a second flat tube group 2, a spacer group 3, a first D-type tube 4 and a second D-type tube 5; the first D-shaped pipe 4 and the second D-shaped pipe 5 are arranged in a close fit manner in parallel, a plurality of notches are formed in the same axial position of the first D-shaped pipe 4 and the second D-shaped pipe 5, each spacer of the spacer group 3 is inserted into the notches in the same position of the first D-shaped pipe 4 and the second D-shaped pipe 5 and is in braze welding connection with the first D-shaped pipe 4 and the second D-shaped pipe 5, and the first D-shaped pipe 4 and the second D-shaped pipe 5 are divided into a plurality of independent chambers by the spacers;

an overflowing hole is formed between the cavities at the same axial positions of the first D-shaped pipe 4 and the second D-shaped pipe 5 for refrigerant communication; the first flat pipe group 1 and the second flat pipe group 2 are composed of a plurality of flat pipes, the flat pipes of the first flat pipe group 1 are connected with the independent cavities of the first D-shaped pipes 4 in a brazing mode, and the flat pipes of the second flat pipe group 2 are connected with the cavities of the second D-shaped pipes 5 in a brazing mode.

As shown in fig. 3, the structural diagram of the spacer is shown, and the purpose of the spacer is to divide the first D-shaped tube 4 and the second D-shaped tube 5 into a plurality of independent chambers at the same time, and the independent chambers of the same D-shaped tube are not communicated with each other. As shown in fig. 4, an overflowing hole is provided between adjacent independent chambers of the first D-shaped pipe 4 and the second D-shaped pipe 5, and the overflowing hole of this embodiment is a circular hole, and may be provided in the form of a kidney-shaped hole, a diamond-shaped hole, or the like according to circumstances. The first D-shaped pipe 4 and the second D-shaped pipe 5 are connected through brazing to ensure no liquid leakage.

The refrigerant flows into the second D-shaped pipe 5 from the second flat pipe group 2, then flows into the first D-shaped pipe 4 from the second D-shaped pipe 5, and finally flows into the first flat pipe group 1 from the first D-shaped pipe 4.

As shown in fig. 5, for the cross-sectional view of flat pipe, the shape and the interior runner of flat pipe can be designed according to the demand in this field, the utility model discloses a backflow structure does not have special requirement to the shape of flat intraduct.

As an optional implementation manner, a plurality of flat tubes can enter the same independent chamber of the D-shaped tube at the same time, the independent chamber of the second D-shaped tube 5 can play a role in mixing firstly, and the independent chamber of the first D-shaped tube 4 distributes mixed refrigerants to the first flat tube group. When the method is used for backflow, the number of the flat pipes connected with the two independent cavities communicated with the first D-shaped pipe 4 and the second D-shaped pipe 5 can be different, and the number of the flat pipes matched with the independent cavities can be selected according to the required refrigerant mixing effect. When mixing is not required, each independent cavity is connected with one flat pipe in a brazing mode.

The flat tube end parts of the first flat tube group 1 and the second flat tube group 2 are provided with the necking ends, the necking ends can be inserted into the D-shaped tubes, and the non-necking ends are left outside the D-shaped tubes, so that the flat tube positioning function is realized during installation.

As shown in fig. 6, the reflux structure of the present invention is applied to a microchannel heat exchanger, and the obtained microchannel heat exchanger includes the reflux structure, a first collecting pipe and a second collecting pipe; the first collecting pipe is connected with the other end of the first flat pipe group in a brazing mode; and the second collecting pipe is connected with the other end of the second flat pipe group in a brazing mode. The refrigerant in the heat exchanger enters from the first collecting pipe, flows into the first flat pipe group after passing through the second flat pipe group, and then flows out from the first collecting pipe. The first collecting pipe can be provided with a refrigerant uniform distribution device so that the refrigerant is uniformly distributed to enter each heat exchange flat pipe. The refrigerant distribution device may be a partition plate disposed in the first collecting pipe, such as the partition plate structure described in ZL201320113521.9 or ZL201420189369.7, or may be a refrigerant flow guiding device.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A D-shaped reflux structure of a heat exchanger is characterized by comprising a first flat tube group (1), a second flat tube group (2), a spacer group (3), a first D-shaped tube (4) and a second D-shaped tube (5); the first D-shaped pipe (4) and the second D-shaped pipe (5) are arranged in a close fit manner in parallel, a plurality of notches are formed in the same axial position of the first D-shaped pipe (4) and the second D-shaped pipe (5), each spacer of the spacer group (3) is inserted into the notches in the same position of the first D-shaped pipe (4) and the second D-shaped pipe (5) and is in braze welding connection with the first D-shaped pipe (4) and the second D-shaped pipe (5), and the first D-shaped pipe (4) and the second D-shaped pipe (5) are divided into a plurality of independent chambers by the spacers;

an overflowing hole is formed between the cavities at the same axial positions of the first D-shaped pipe (4) and the second D-shaped pipe (5) for refrigerant communication; the first flat pipe group (1) and the second flat pipe group (2) are composed of a plurality of flat pipes, the flat pipes of the first flat pipe group (1) are connected with independent cavities of the first D-shaped pipes (4) in a brazing mode, and the flat pipes of the second flat pipe group (2) are connected with cavities of the second D-shaped pipes (5) in a brazing mode.

2. The D-shaped reflux structure of the heat exchanger according to claim 1, characterized in that the second flat tube group (2) and the first flat tube group (1) have the same structure, and the spacers are uniformly distributed at equal intervals in the axial direction of the D-shaped tube.

3. The D-shaped reflux structure of the heat exchanger according to claim 1, characterized in that the surface of the spacer group (3) is provided with a brazing filler metal layer for facilitating the brazing connection with the first D-shaped pipe (4) and the second D-shaped pipe (5).

4. The type D return structure of a heat exchanger according to claim 1, characterized in that the first type D pipe (4) and the second type D pipe (5) are brazed.

5. A type D return structure for a heat exchanger according to claim 1 wherein one of the separate chambers is connected to one or more flat tubes.

6. The D-shaped reflux structure of the heat exchanger according to claim 1, characterized in that the flat tube ends of the first flat tube group (1) and the second flat tube group (2) are provided with a necking, and can play a role in positioning when the first D-shaped tube (4) and the second D-shaped tube (5) are inserted.