Multifunctional micro-channel evaporator

Abstract

The utility model belongs to the technical field of micro-channel heat exchangers, particularly relates to a multifunctional micro-channel evaporator, and solves the problem that the multifunctional micro-channel evaporator cannot be used as a condenser for reverse circulation of a heat exchange medium. The multifunctional micro-channel evaporator comprises at least two collecting pipes, the collecting pipes are communicated through a plurality of flat pipes, each collecting pipe at least comprises a first connecting pipe and a second connecting pipe, a flow dividing pipe is axially arranged in each first connecting pipe, one end of each flow dividing pipe is closed, the other end of each flow dividing pipe is connected with a first inlet and outlet pipe, and the other end of each flow dividing pipe is connected with a second inlet and outlet pipe. A plurality of through holes are axially distributed in the pipe body, a second inlet and outlet pipe is arranged on the second connecting pipe, and a standby output structure is further arranged on the first connecting pipe. And by arranging the standby output structure, the multifunctional effect that the device can be used as an evaporator or a condenser is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of micro-channel heat exchanger, especially relates to a multifunctional micro-channel evaporator. BACKGROUND

[0002] The micro-channel heat exchanger is mainly composed of flat tubes and collecting pipes, and the heat exchange medium flows between the flat tubes and the collecting pipes, and exchanges heat with the outside through the flat tube wall.

[0003] In the prior art, some micro-channel evaporators are provided with a distribution pipe in the collecting pipe for inputting the heat exchange medium to improve the uniformity of the distribution of the heat exchange medium to each flat tube. However, this kind of evaporator cannot be used as a condenser which needs the reverse flow of the heat exchange medium, because the efficiency of the heat exchange medium entering the distribution pipe through the axially distributed through holes is very low, that is, the flow rate of the distribution pipe for the output of the heat exchange medium from the collecting cavity is very low, which cannot match the rate of the heat exchange medium input into the device, and may cause the internal pressure to be too large. UTILITY MODEL CONTENT

[0004] The utility model aims at the above-mentioned problems existing in the prior art, and provides a multifunctional micro-channel evaporator.

[0005] In order to realize the purpose of the utility model, the following technical schemes can be used:

[0006] A multifunctional micro-channel evaporator, comprising at least two collecting pipes, the collecting pipes are communicated by a plurality of flat tubes, the collecting pipe at least comprises a first connecting pipe and a second connecting pipe, the first connecting pipe is provided with a distribution pipe in the axial direction, one end of the distribution pipe is closed, the other end is connected with a first inlet and outlet pipe, and a plurality of through holes are distributed in the axial direction on the pipe body, the second connecting pipe is provided with a second inlet and outlet pipe, and the first connecting pipe is further provided with a standby output structure.

[0007] The utility model discloses a microchannel evaporator is generally composed of collecting pipe and flat tube, and the first connecting pipe and the second connecting pipe are used for the input and output of heat exchange medium respectively, of course, more collecting pipes can be arranged for the intermediate transition, and this is the prior art. The first connecting pipe is used for heat exchange medium input when the device is used as an evaporator, and the heat exchange medium is input into the collecting cavity of the first connecting pipe through each through hole on the shunt pipe, which is beneficial to the uniform distribution of the heat exchange medium to the flat tube, ensures that the heat exchange medium passing through each flat tube is basically the same, and the heat exchange medium enters the second connecting pipe and is output from the second inlet and outlet pipe after heat exchange through the flat tube. When the device is used as a condenser, the flow direction of the heat exchange medium can be adjusted to be reverse, the heat exchange medium is input into the second connecting pipe first, then enters the first connecting pipe after passing through the flat tube, and is output from the first inlet and outlet pipe through the through hole and the shunt pipe. Since the aperture of the through hole is small, the passing efficiency of the heat exchange medium is low, and the standby output structure can be opened at this time to help output the heat exchange medium and improve the flow efficiency. The standby output structure can be in the normally closed state when not needed.

[0008] In the multifunctional microchannel evaporator, one end of the first connecting pipe is closed by an end cover, a connecting hole is formed through the end cover, the shunt pipe is inserted into the connecting hole and fixed, and the end cover and the port of the first connecting pipe are fixed by welding or screwing.

[0009] The first connecting pipe is a cylindrical pipe with one end closed and the other end open, and an end cover is arranged in the open end to form a collecting cavity. Compared with directly forming the connecting hole on the end face of the collecting pipe, the connecting hole arranged on the end cover reduces the processing difficulty and is convenient for adjustment and replacement. The shunt pipe is inserted into the connecting hole, and the pipe body is located in the collecting cavity with one end exposed for connection with the first inlet and outlet pipe.

[0010] In the multifunctional microchannel evaporator, the shunt pipe and the connecting hole are fixed by welding, and the outer end of the shunt pipe is connected with the first inlet and outlet pipe through a quick connector.

[0011] The shunt pipe and the connecting hole are circumferentially welded for 360 degrees, which has high fixing strength and ensures the sealing property. The shunt pipe and the first inlet and outlet pipe are connected through a quick connector, which has flexible detachability. The quick connector can be, for example, a threaded type, a tight-fit clamping type, or even further welded and fixed after butt joint.

[0012] In the multifunctional microchannel evaporator, an inner diameter of the first connecting pipe is adapted to the outer diameter of the shunt pipe, and a positioning ring or a positioning blind hole is arranged on the inner end face of the first connecting pipe. The inner end of the shunt pipe is inserted into the positioning ring or the positioning blind hole, and an easy-entry chamfer is arranged on the outer end of the positioning ring or the positioning blind hole.

[0013] The inner side of the closed end of the first connecting pipe is provided with a positioning ring or a positioning blind hole, which can position the inner end of the shunt pipe, avoid the connection between the shunt pipe and the end cover from breaking, and facilitate the setting of the easy-to-enter chamfer to guide the insertion fit.

[0014] In the multifunctional micro-channel evaporator, the shunt pipe is coaxial with the first connecting pipe, or the shunt pipe is eccentric to the axis of the first connecting pipe and located on the side away from the flat tube.

[0015] The shunt pipe and the first connecting pipe can be concentrically arranged, so that the positioning structure on the inner end face of the first connecting pipe and the connecting hole are located on the same straight line, reducing the assembly difficulty. Alternatively, the shunt pipe and the first connecting pipe can be eccentrically arranged, and the shunt pipe is offset to the side away from the flat tube, so that the heat exchange medium has a longer path after being output from the through hole to the mouth of the flat tube, which is beneficial to the mixing and uniform distribution of the heat exchange medium.

[0016] In the multifunctional micro-channel evaporator, the through hole is located on the side of the shunt pipe away from the flat tube, and the included angle between the extension direction of the through hole and the extension direction of the flat tube is between 0-90 degrees.

[0017] The through hole is not directly opposite to the flat tube, so that the heat exchange medium needs to be guided by the rebound of the inner wall of the collecting cavity after being output from the through hole to flow into the flat tube, which is beneficial to the mixing and uniform distribution of the heat exchange medium to the flat tube.

[0018] In the multifunctional micro-channel evaporator, a flow guide plate is fixedly arranged between the shunt pipe and the first connecting pipe, the flow guide plate extends axially and has an arc-shaped flow guide surface concave inward, and the flow guide surface blocks the extension direction of the through hole.

[0019] The flow guide plate is located between the through hole and the flat tube, so that the heat exchange medium needs to travel an arc-shaped path greater than 180 degrees around the shunt pipe to enter the flat tube after being output from the through hole, which is beneficial to the mixing of the heat exchange medium during the flow process and the subsequent uniform distribution.

[0020] In the multifunctional micro-channel evaporator, the through hole and the flat tube do not extend in the same direction, the flow guide plate is in the form of a circular arc and is located on the side of the through hole close to the flat tube, and the flow guide surface connects the outer side wall of the shunt pipe and the inner side wall of the first connecting pipe.

[0021] Alternatively, the through hole and the flat tube are arranged on the shunt pipe in the same direction and located on the side away from the flat tube, the flow guide plate is fixed to the inner side wall of the first connecting pipe away from the flat tube, and the cross section of the flow guide plate is in the form of a chevron, and the flow guide surface is formed on both sides of the flow guide plate.

[0022] When the through hole is located in the width direction of the flat tube, the guide plate only needs to guide the heat exchange medium output from the through hole to the direction away from the flat tube to achieve the corresponding effect. When the through hole is arranged in the length direction of the flat tube, the guide plate is arranged in a herringbone shape, two guide surfaces intersect at a line, the line does not contact the outer side wall of the shunt pipe, and the heat exchange medium can be guided to both sides.

[0023] In the multifunctional micro-channel evaporator, the shunt pipe is arranged in the straight cut type opening.

[0024] The flat tube slot is arranged in the straight cut type opening, that is, without flanging, which is beneficial to reducing the accumulation of the heat exchange medium at the flat tube slot when the product is used for the evaporator.

[0025] In the multifunctional micro-channel evaporator, the standby output structure includes a standby pipe in communication with the shunt cavity of the first connecting pipe, and the side of the first connecting pipe is provided with a connecting seat, and the standby pipe is fixedly connected with the first connecting pipe through the connecting seat.

[0026] The standby output structure specifically outputs the heat exchange medium by the standby pipe, and the connecting seat is arranged on the outer wall of the shunt pipe, wherein a plug-in hole extending in the radial direction of the shunt pipe is arranged, the plug-in hole is in communication with the shunt cavity, and the standby pipe can be connected in the plug-in hole and fixed.

[0027] Compared with the prior art, the multifunctional micro-channel evaporator has the following advantages:

[0028] 1. The device is mainly used as an evaporator, and can also be used as a condenser. When used as an evaporator, the heat exchange medium is specifically input into the shunt cavity of the first connecting pipe through each through hole on the shunt pipe, which is beneficial to uniformly distributing the heat exchange medium to the flat tubes and ensuring that the heat exchange medium passing through each flat tube is basically the same. When used as a condenser, the flow direction of the heat exchange medium can be adjusted in reverse, and the standby output structure can be opened at this time to help the shunt pipe output the heat exchange medium and improve the flow efficiency.

[0029] 2. Compared with directly arranging the connecting hole on the end face of the shunt pipe, arranging the connecting hole on the end cover reduces the machining difficulty and is convenient for adjustment and replacement.

[0030] 3. The inner side of the closed end of the first connecting pipe is provided with a positioning ring or a positioning blind hole, so that the inner end of the shunt pipe can be positioned.

[0031] 4. The shunt pipe and the first connecting pipe can be concentrically arranged, so that the positioning structure on the inner end face of the first connecting pipe and the connecting hole are located on the same straight line, and the assembly difficulty is reduced. The shunt pipe and the first connecting pipe can also be eccentrically arranged, and are eccentric to the side away from the flat tube, so that the heat exchange medium has a longer path after being output from the through hole to the mouth of the flat tube, which is beneficial to the mixing and uniform distribution of the heat exchange medium.

[0032] 5. The guide plate is located between the through hole and the flat tube, so that the heat exchange medium needs to travel along an arc path greater than 180 degrees around the shunt pipe to enter the flat tube after being output from the through hole, which is beneficial to the mixing of the heat exchange medium and the subsequent uniform distribution during flow.

[0033] 6. The flat tube groove is provided as a straight cut opening, i.e. without a flange, which is beneficial to reducing the accumulation of heat exchange medium at the flat tube groove when the product is used for an evaporator. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a schematic diagram of the overall structure provided by the present application;

[0035] Figure 2 is a schematic diagram of the cross section of the first connecting pipe side (the cross section is parallel to the plate surface of the evaporator);

[0036] Figure 3 is a schematic diagram of the cross section of the first connecting pipe of embodiment 1 (the cross section is perpendicular to the plate surface of the evaporator);

[0037] Figure 4 is a schematic diagram of the structure of the shunt pipe provided by the present application;

[0038] Figure 5 is a schematic diagram of the flat tube groove provided on the manifold provided by the present application;

[0039] Figure 6 is a schematic diagram of the cross section of the first connecting pipe of embodiment 2 (the cross section is perpendicular to the plate surface of the evaporator);

[0040] Figure 7 is a schematic diagram of the cross section of the first connecting pipe of embodiment 3 (the cross section is perpendicular to the plate surface of the evaporator).

[0041] In the figure, the manifold 1, the flat tube 2, the first connecting pipe 3, the second connecting pipe 4, the shunt pipe 5, the first inlet and outlet pipe 6, the pipe body 7, the through hole 8, the second inlet and outlet pipe 9, the backup output structure 10, the end cover 11, the connecting hole 12, the quick connector 13, the positioning ring 14, the easy-to-enter chamfer 15, the guide plate 16, the guide surface 17, the flat tube groove 18, the backup pipe 19, the connecting seat 20. DETAILED DESCRIPTION

[0042] The following is a specific embodiment of the present application combined with the drawings, which further describes the technical solution of the present application, but the present application is not limited to these embodiments.

[0043] Embodiment 1

[0044] The specific embodiment is as follows: Figures 1-5As shown, the multifunctional micro-channel evaporator includes two parallel arranged headers 1, the headers 1 are communicated by a plurality of parallel arranged flat tubes 2, the header 1 includes a first connecting pipe 3 and a second connecting pipe 4, the first connecting pipe 3 is axially provided with a shunt pipe 5, one end of the shunt pipe 5 is closed, the other end is connected with a first inlet and outlet pipe 6, and a plurality of through holes 8 are axially distributed on a pipe body 7, the second connecting pipe 4 is provided with a second inlet and outlet pipe 9, and the first connecting pipe 3 is further provided with a standby output structure 10.

[0045] Specifically, the device can be used as an evaporator, and can also be used as a condenser, and has multiple functions. When used as an evaporator, the first connecting pipe 3 is used for input of a heat exchange medium, the heat exchange medium is specifically input into a header cavity of the first connecting pipe 3 through each through hole 8 on the shunt pipe 5, which is beneficial to uniformly distribute the heat exchange medium to the flat tubes 2, so as to ensure that the heat exchange medium passing through each flat tube 2 is basically the same, and the heat exchange medium enters the second connecting pipe 4 after heat exchange through the flat tubes 2 and is output from the second inlet and outlet pipe 9. When used as a condenser, the flow direction of the heat exchange medium can be adjusted to be reversed, the heat exchange medium is first input into the second connecting pipe 4, then enters the first connecting pipe 3 after passing through the flat tubes 2, and then enters the shunt pipe 5 through the through hole 8, and is then output from the first inlet and outlet pipe 6. Since the aperture of the through hole 8 is small, the passing efficiency of the heat exchange medium is low, and the standby output structure 10 can be opened at this time to help output the heat exchange medium and improve the flow efficiency. The standby output structure 10 can be in a normally closed state when not needed.

[0046] As shown in Figure 1 , 2 One end of the first connecting pipe 3 is closed by an end cover 11, a connecting hole 12 is provided through the end cover 11, the shunt pipe 5 is inserted through the connecting hole 12 and fixed, and the end cover 11 and the port of the first connecting pipe 3 are fixed by welding or screwing. The shunt pipe 5 and the connecting hole 12 are fixed by welding, and the outer end of the shunt pipe 5 is connected with the first inlet and outlet pipe 6 through a quick connector 13. An inner diameter of the end face of the first connecting pipe 3 is adapted to the outer diameter of the shunt pipe 5, and a positioning ring 14 is arranged on the end face of the first connecting pipe 3, the inner end of the shunt pipe 5 is inserted into the positioning ring 14, and an easy entry chamfer 15 is arranged on the outer end of the positioning ring 14 and the positioning blind hole.

[0047] Specifically, one end of the first connecting pipe 3 is closed and the other end is open, and an end cover 11 is arranged in the open end to form a collecting cavity. Compared with directly arranging a connecting hole 12 on the end face of the collecting pipe 1, the connecting hole 12 arranged on the end cover 11 reduces the processing difficulty and is convenient for adjustment and replacement. The shunt pipe 5 is inserted into the connecting hole 12, and the pipe body 7 is located in the collecting cavity and protrudes at one end for convenient connection with the first inlet and outlet pipe. The shunt pipe 5 is circumferentially welded with the connecting hole 12 by 360 degrees, which has high fixing strength and ensures the sealing property. The shunt pipe 5 and the first inlet and outlet pipe 6 are connected through a quick connector 13, which has flexible detachability. The inner side of the closed end of the first connecting pipe 3 is provided with a positioning ring 14, which can position the inner end of the shunt pipe 5 to avoid the connection between the shunt pipe 5 and the end cover 11 from breaking. The easy-to-enter chamfer 15 is arranged to facilitate the guiding of the insertion cooperation.

[0048] As shown in Figure 1 , 3 , the shunt pipe 5 is arranged eccentrically relative to the axis of the first connecting pipe 3 and is located on the side away from the flat tube 2. The through hole 8 is located on the side of the shunt pipe 5 away from the flat tube 2 and is not in the same direction as the flat tube 2. A flow guide plate 16 is fixedly arranged between the shunt pipe 5 and the first connecting pipe 3. The flow guide plate 16 extends axially and has an arc-shaped flow guide surface 17 concave inward. The flow guide surface 17 blocks the extension direction of the through hole 8. The flow guide plate 16 is in the form of a circular arc and is located on the side of the through hole 8 close to the flat tube 2. The flow guide surface 17 connects the outer side wall of the shunt pipe 5 and the inner side wall of the first connecting pipe 3.

[0049] Specifically, the shunt pipe 5 and the first connecting pipe 3 are arranged eccentrically and are biased to the side away from the flat tube 2, so that the heat exchange medium has a longer path after being output from the through hole 8 to the mouth of the flat tube 2, which is conducive to the mixing and uniform distribution of the heat exchange medium. The flow guide plate 16 is located between the through hole 8 and the flat tube 2, so that the heat exchange medium needs to travel an arc-shaped path of more than 180 degrees after being output from the through hole 8 to enter the flat tube 2, which is conducive to the mixing of the heat exchange medium during the flow process and the subsequent uniform distribution.

[0050] As an optimization of the present embodiment, the collecting pipe 1 is provided with a flat tube slot 18 which penetrates radially. The end of the flat tube 2 is inserted into and fixed in the flat tube slot 18. The flat tube slot 18 is a straight cut opening without a flange, which is conducive to reducing the accumulation of heat exchange medium at the flat tube slot 18 when the product is used in an evaporator.

[0051] In the present embodiment, the standby output structure 10 includes a standby pipe 19 which communicates with the collecting cavity of the first connecting pipe 3. The side of the first connecting pipe 3 is provided with a connecting seat 20 in which an insertion hole extending in the radial direction of the collecting pipe 1 is arranged. The insertion hole communicates with the collecting cavity, and the standby pipe 19 is connected to and fixed in the insertion hole.

[0052] Specific working principle: when as evaporator, the heat exchange medium from the first inlet and outlet pipe 6 into the shunt pipe 5, after from the shunt pipe 5 on the through hole 8 flow out to the first connecting pipe 3, and under the guidance of the flow guide plate 16 and the inner side wall of the shunt pipe 5, around the shunt pipe 5 to the flat tube 2, the heat exchange medium after the flat tube 2 from the second inlet and outlet pipe on the second connecting pipe 4 output.

[0053] When as condenser, the heat exchange medium from the second inlet and outlet pipe 9 into the second connecting pipe 4, and then through the flat tube 2 into the first connecting pipe 3 of the shunt pipe 5, at this time the standby pipe 19 is in the open state, a part of the heat exchange medium from the through hole 8 into the shunt pipe 5 after from the first inlet and outlet pipe 6 output, another part from the standby pipe 19 output.

[0054] Example 2

[0055] The specific working principle of this embodiment is basically the same as that of example 1, the difference lies in the position of the through hole 8.

[0056] Specific embodiments such as Figure 6 As shown in the figure, the through hole 8 is located on the side of the shunt pipe 5 away from the flat tube 2.

[0057] Example 3

[0058] The specific working principle of this embodiment is basically the same as that of example 1, the difference lies in the position of the through hole 8 and the shape of the flow guide plate 16.

[0059] Specific embodiments such as Figure 7 As shown in the figure, the through hole 8 is located on the side of the shunt pipe 5 away from the flat tube 2, and the flow guide plate 16 is fixed on the inner side wall of the first connecting pipe 3 away from the flat tube 2, and the cross section is in the shape of a herringbone, and the two flow guide surfaces 17 are formed on both sides of the flow guide surface 17 respectively. Two flow guide surfaces 17 intersect at a line, which does not connect with the outer side wall of the shunt pipe 5, and can guide the heat exchange medium to both sides.

[0060] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace them, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A multifunctional microchannel evaporator comprising at least two headers (1) which are connected by a plurality of flat tubes (2), characterized in that, The manifold (1) comprises at least a first connecting pipe (3) and a second connecting pipe (4), the first connecting pipe (3) is provided with a shunt pipe (5) axially, the shunt pipe (5) is closed at one end and connected with a first inlet and outlet pipe (6) at the other end, and a plurality of through holes (8) are distributed axially on the pipe body (7), the second connecting pipe (4) is provided with a second inlet and outlet pipe (9), and the first connecting pipe (3) is further provided with a standby output structure (10).

2. The multifunctional microchannel evaporator of claim 1, wherein, One end of the first connecting pipe (3) is closed by an end cover (11), the end cover (11) is provided with a connecting hole (12) penetrating through, the shunt pipe (5) penetrates the connecting hole (12) and is fixed, and the end cover (11) and the port of the first connecting pipe (3) are fixed by welding or screwing.

3. The multifunctional microchannel evaporator of claim 2, wherein, The shunt pipe (5) and the connecting hole (12) are fixed by welding, and the outer end of the shunt pipe (5) is connected with the first inlet and outlet pipe (6) through a quick connector (13).

4. The multifunctional microchannel evaporator of claim 3, wherein, The inner end surface of the first connecting pipe (3) is provided with a positioning ring (14) or a positioning blind hole with an inner diameter adapted to the outer diameter of the shunt pipe (5), the inner end of the shunt pipe (5) is inserted into the positioning ring (14) or the positioning blind hole, and the outer end of the positioning ring (14) and the positioning blind hole is provided with an easy-to-enter chamfer (15).

5. The multifunctional microchannel evaporator of claim 1, wherein, The shunt pipe (5) is coaxial with the first connecting pipe (3); or the shunt pipe (5) is eccentric relative to the axis of the first connecting pipe (3) and located on the side away from the flat pipe (2).

6. The multifunctional microchannel evaporator of claim 1, wherein, The through hole (8) is located on the side of the shunt pipe (5) away from the flat pipe (2), and the included angle between the extension direction of the through hole (8) and the extension direction of the flat pipe (2) is between 0-90 degrees.

7. The multifunctional microchannel evaporator of claim 1 wherein, The shunt pipe (5) and the first connecting pipe (3) are fixedly provided with a flow guide plate (16), the flow guide plate (16) extends axially and has an inwardly concave arc-shaped flow guide surface (17), and the flow guide surface (17) blocks the extension direction of the through hole (8).

8. The multifunctional microchannel evaporator of claim 7, wherein, The through hole (8) and the flat pipe (2) are not extended in the same direction, the flow guide plate (16) is in the form of a circular arc and located on the side of the through hole (8) close to the flat pipe (2), and the flow guide surface (17) connects the outer side wall of the shunt pipe (5) and the inner side wall of the first connecting pipe (3). Alternatively, the through hole (8) and the flat pipe (2) are arranged on the shunt pipe (5) in the same direction and located on the side away from the flat pipe (2), the flow guide plate (16) is fixed on the inner side wall of the first connecting pipe (3) away from the flat pipe (2) and has a herringbone cross section, and the flow guide surface (17) is formed on both sides of the flow guide plate (16).

9. The multifunctional microchannel evaporator of any of claims 1-7, wherein, The manifold (1) is provided with a flat pipe slot (18) penetrating radially, the end of the flat pipe (2) is inserted and fixed in the flat pipe slot (18), and the flat pipe slot (18) is a straight cut type opening.

10. The multifunctional microchannel evaporator of any of claims 1-7, wherein, The standby output structure (10) comprises a standby pipe (19) in communication with the collecting cavity of the first connecting pipe (3), the side of the first connecting pipe (3) is provided with a connecting seat (20), and the standby pipe (19) is fixedly connected with the first connecting pipe (3) through the connecting seat (20).

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