CN112240714B

CN112240714B - Evaporator

Info

Publication number: CN112240714B
Application number: CN201910655783.XA
Authority: CN
Inventors: 段炼; 张岩; 袁侠义
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2022-04-26
Anticipated expiration: 2039-07-19
Also published as: CN112240714A

Abstract

The invention discloses an evaporator which comprises a first collecting pipe and a second collecting pipe which are arranged oppositely at a preset distance, wherein a plurality of condensing pipes are arranged between the first collecting pipe and the second collecting pipe, two ends of each condensing pipe are respectively inserted into the first collecting pipe and the second collecting pipe so that a refrigerant moves from the first collecting pipe to the second collecting pipe, the first collecting pipe is provided with a refrigerant inlet for being connected with an external refrigerant pipeline, the bottom of the inside of the first collecting pipe is provided with a drainage arc surface extending from the refrigerant inlet to the inside of the first collecting pipe, the height of the drainage arc surface is increased and then reduced from the refrigerant inlet to the inside of the first collecting pipe, and a structure with a large middle part and two small ends is formed when the structure is observed from the longitudinal section direction of the first collecting pipe. The evaporator can improve the uniformity of refrigerant distribution, ensure uniform heat exchange at the inlet of the evaporator and improve the heat exchange efficiency.

Description

Evaporator

Technical Field

The invention relates to the technical field of air conditioning systems, in particular to an evaporator and an air conditioning system.

Background

The automobile is a commonly used vehicle in life, a passenger cabin of the automobile is used as a space for long-term intermittent use of a driver and passengers, and improvement of the comfort of the passenger cabin is an important measure for safe driving of the automobile and reduction of the risk of accidents of the automobile. The automobile air conditioning system is a key device for realizing refrigeration, heating and ventilation of the passenger compartment, plays a vital role in improving the comfort of the passenger compartment, relieving the fatigue of a driver and improving the safety of an automobile, and therefore the attention on the performance of the automobile air conditioning system is higher and higher.

The evaporator is used as a key component in an automobile air conditioning system, and mainly evaporates high-temperature low-pressure refrigerant to absorb heat of a passenger compartment, so that the aim of reducing the temperature of the passenger compartment is fulfilled. The current automobile-used evaporimeter is because the refrigerant velocity of flow of pressure manifold import is great, great velocity of flow causes the refrigerant to dwell time less in the collecting pipe, and again because the influence of pipe wall frictional resistance at the in-process that the refrigerant flows along the collecting pipe, the quantity that the refrigerant flows to collecting pipe flow direction rear end reduces, thereby arouse that the quantity of the refrigerant that flows into flat pipe in the collecting pipe is less, the refrigerant flow distribution that is close to the evaporimeter both sides is less, the flow distribution of refrigerant in the evaporimeter flat pipe is inhomogeneous, make the heat transfer volume in the flat pipe incompletely the same, especially the temperature of evaporator both sides flat pipe is higher, thereby make the air current temperature difference of blowing in the passenger cabin obvious, make the passenger have stronger uncomfortable, reduce the travelling comfort in passenger cabin.

The prior art adopts a method of installing a partition board in the upper collecting pipe along the flow channel direction and installing a partition board in the lower collecting pipe along the flow channel direction, the upper collecting pipe and the lower collecting pipe are equally divided into two circulation pipelines, and meanwhile, the pipe wall of the bottom of each circulation pipeline is arranged in an arc shape, so that the drainage effect of the collecting pipe can be enhanced, the surface of a radiator core is prevented from frosting, and a cold medium outlet pipe pass is reduced, so that the heat exchange performance can be enhanced, but the structure of the radiator can not change the flow speed of a refrigerant in the collecting pipe, so that the flow distribution in flat pipes on two sides of an evaporator is still uneven, the heat exchange quantity in the flat pipes is uneven, the air flow temperature of a passenger cabin is still easy to be uneven, and the comfort of the passenger cabin is reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an evaporator which can change the flow speed of refrigerant in a collecting pipe, improve the flow distribution uniformity of the refrigerant and improve the comfort of a passenger cabin.

In order to achieve the above object, the present invention provides an evaporator, including a first collecting pipe and a second collecting pipe which are arranged opposite to each other at a predetermined distance, wherein a plurality of condenser pipes are arranged between the first collecting pipe and the second collecting pipe, two ends of each condenser pipe are respectively inserted into the first collecting pipe and the second collecting pipe so as to move a refrigerant from the first collecting pipe to the second collecting pipe, the first collecting pipe is provided with a refrigerant inlet for connecting with an external refrigerant pipe, a drainage arc surface extending from the refrigerant inlet to the inside of the first collecting pipe is arranged at the bottom of the inside of the first collecting pipe, the height of the drainage arc surface is increased and then decreased from the refrigerant inlet to the inside of the first collecting pipe, and a structure with a large middle and two small ends is formed when viewed from the longitudinal section direction of the first collecting pipe.

As a preferable scheme, the first collecting pipe is provided with a refrigerant outlet for connecting with an external refrigerant pipeline, one end of the bottom of the inside of the first collecting pipe, which is close to the refrigerant outlet, is provided with a first slope, and the height of the first slope decreases progressively from the refrigerant outlet to the inside of the first collecting pipe.

Preferably, the second collecting pipe is provided with a refrigerant outlet for connecting with an external refrigerant pipeline, one end of the bottom of the inside of the second collecting pipe, which is close to the refrigerant outlet, is provided with a first slope, and the height of the first slope decreases gradually from the refrigerant outlet to the inside of the second collecting pipe.

Preferably, an inclined insertion opening matched with the first slope surface is formed in the end part of the condensation pipe matched and inserted with the first slope surface.

Preferably, the bottom of the inside of the first collecting pipe is further provided with at least one second slope, and the height of the second slope decreases progressively from the flow direction of the refrigerant.

Preferably, the pipe diameters of the plurality of condensation pipes arranged opposite to the second slope surface are reduced firstly and then increased.

As the preferred scheme, the pipe diameters of a plurality of condensing pipes which are arranged opposite to the drainage cambered surface are firstly reduced and then increased.

As a preferred scheme, the drainage cambered surface comprises a first cambered surface, a horizontal flow surface and a second cambered surface which are arranged in a smooth transition mode in sequence, the first cambered surface and the second cambered surface are arc-shaped protrusions protruding out of the pipe wall, and two ends of the horizontal flow surface are respectively tangent to the arc-shaped protrusions of the first cambered surface and the arc-shaped protrusions of the second cambered surface.

Preferably, the radius of the first cambered surface is R₆The radius of the second cambered surface is R₇And R is₆Less than R₇。

Preferably, a boss is further disposed on a pipe wall of the first collecting pipe, which is opposite to the first arc surface, at the top of the end portion, close to the refrigerant inlet, of the first collecting pipe, and the height of the downward protrusion of the boss is gradually reduced.

Preferably, the bosses are spaced apart in a row in a flow direction of the refrigerant, and a height of the bosses protruding downward is gradually reduced.

As the preferred scheme, the tip of condenser pipe is equipped with drainage cambered surface assorted arc socket.

Preferably, the first collecting pipe comprises a first row of pipes and a second row of pipes which are arranged in parallel; the first row of pipes comprise a first upper collecting pipe and a second upper collecting pipe, the refrigerant inlet is arranged at the first end part of the first upper collecting pipe, the drainage arc surface is arranged in the first upper collecting pipe, the second end part of the first upper collecting pipe is closed, and the two ends of the second upper collecting pipe are closed; the second row of tubes comprises a third upper collecting tube and a fourth upper collecting tube, the second upper collecting tube is communicated with the third upper collecting tube, two ends of the third upper collecting tube are sealed, the refrigerant outlet is arranged at the first end part of the fourth upper collecting tube, and the second end part of the fourth upper collecting tube is sealed;

the second collecting pipe comprises a third row of pipes and a fourth row of pipes which are arranged in parallel, the first row of pipes and the third row of pipes are arranged oppositely, and the second row of pipes and the third row of pipes are arranged oppositely;

the first upper collecting pipe is communicated with the third row of pipes through a condensing pipe, the third row of pipes is communicated with the second upper collecting pipe through a condensing pipe, the third upper collecting pipe is communicated with the fourth row of pipes through a condensing pipe, and the fourth row of pipes is communicated with the fourth upper collecting pipe through a condensing pipe.

Preferably, the top of the inside of the third tube array is provided with a first flow guide plate which is obliquely and downwardly arranged along the flowing direction of the refrigerant; and a second drainage plate which is obliquely and downwardly arranged along the flowing direction of the refrigerant is arranged at the top of the inner part of the fourth tube array.

Preferably, the first drainage plate is arranged in the middle of the third row of tubes, and the second drainage plate is arranged in the middle of the fourth row of tubes.

Compared with the prior art, the invention has the beneficial effects that:

the evaporator is provided with two corresponding collecting pipes and a condensing pipe connected with the two collecting pipes, a refrigerant enters one collecting pipe from an inlet pipe of the collecting pipe and flows into the other collecting pipe through the condensing pipe, on the basis of the structure of the existing evaporator, a drainage arc surface is arranged on the bottom pipe wall extending inwards from a refrigerant inlet in a first collecting pipe, the height of the drainage arc surface is increased from the refrigerant inlet to the inner direction of the first collecting pipe firstly and then is reduced, wherein the part of the drainage arc surface with the increased height can reduce the flowing speed of the refrigerant, the retention time of the refrigerant at the refrigerant inlet part in the first collecting pipe is increased, and the amount of the refrigerant entering the condensing pipe from the first collecting pipe is increased; the drainage cambered surface that highly reduces can increase the flow velocity of refrigerant, can increase the quantity of the refrigerant that flows to first pressure manifold rear portion like this, the quantity of the refrigerant that flows into the condenser pipe has been increased simultaneously, make the quantity of the refrigerant in the condenser pipe of the corresponding entry end of first pressure manifold and the condenser pipe of rear end increase like this, improve the homogeneity that the refrigerant distributes in first pressure manifold, the refrigerant distribution that makes to enter into the condenser pipe like this is even, make the heat that enters into between a plurality of condenser pipes and the refrigerant heat transfer each other in the condenser pipe, the even heat transfer of evaporimeter has been guaranteed, the refrigerated efficiency has been improved.

Drawings

FIG. 1 is a schematic view of an evaporator according to an embodiment of the present invention;

FIG. 2 is an enlarged view taken at N in FIG. 1;

FIG. 3 is a schematic refrigerant flow diagram of an evaporator according to an embodiment of the present invention;

fig. 4 is a schematic view of a first row of flat tubes of an evaporator according to an embodiment of the present invention;

FIG. 5 is a schematic front view of an evaporator according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a cross-section A-A in FIG. 5;

FIG. 7 is a schematic structural view of a cross-section B-B in FIG. 5;

FIG. 8 is a schematic structural view of a cross-section at C-C in FIG. 5;

FIG. 9 is a schematic structural view of a cross section taken at D-D in FIG. 5;

FIG. 10 is a schematic view of a portion of the structure indicated by P in FIG. 5;

FIG. 11 is a schematic view of a portion of the structure indicated by Q in FIG. 5;

FIG. 12 is a schematic rear view of an evaporator according to an embodiment of the present invention;

FIG. 13 is a schematic view of a portion of the structure indicated by S in FIG. 12;

FIG. 14 is a schematic view of a portion of the structure indicated by T in FIG. 12;

FIG. 15 is a left side view schematically illustrating the structure of the evaporator according to the embodiment of the present invention;

FIG. 16 is a schematic view of section E-E of FIG. 15;

FIG. 17 is a schematic view of the structure of section F-F in FIG. 15;

FIG. 18 is a schematic view of the structure of section G-G in FIG. 15;

fig. 19 is a schematic structural view of the H-H section in fig. 15.

In the figure, 1, a first upper header; 2. a second upper header; 3. a third upper header; 4. a fourth upper header; 5. a first separator; 6. a second separator; 7. a refrigerant outlet; 8. a refrigerant inlet; 9. a fin; 10. a first row of flat tubes; 11. a second row of flat tubes; 13. a first lower header; 14. a second lower header; 15. a fourth lower header; 16. a third lower header; 17. a first plurality of flat tubes of the first row of flat tubes; 18. a second plurality of flat tubes of the first row of flat tubes; 19. a third plurality of flat tubes of the first row of flat tubes; 20. a first plurality of flat tubes of the second row of flat tubes; 21. a second plurality of flat tubes of a second row of flat tubes; 22. a third plurality of flat tubes of the second row of flat tubes; 23. a first plurality of flat tubes of a third row of flat tubes; 24. a second plurality of flat tubes of a third row of flat tubes; 25. a third plurality of flat tubes of a third row of flat tubes; 26. a first plurality of flat tubes of the fourth row of flat tubes; 27. a second multi-flat tube of the fourth row of flat tubes; 28. a third plurality of flat tubes of the fourth row of flat tubes; 29. a fourth row of flat tube cambered surfaces; 30. a first slope surface; 31. a boss; 32. a second slope surface; 33. a third slope surface; 35. a first drainage plate; 36. a second drainage plate; 100. a first header; 200. a second header; 300. a condenser tube; 103. a first region; 104. a second region; 105. drainage cambered surface; 106. a first arc surface; 107. a second arc surface; 108. a advection surface; 1011. a first array of tubes; 1012. a second array of tubes; 2011. a third array of tubes; 2012. and a fourth row of tubes.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

An evaporator according to a preferred embodiment of the present invention, as shown in fig. 1 and 2, includes a first header 100 and a second header 200 that are opposite to each other and separated by a predetermined distance, where the first header 100 includes a first row of tubes 1011 and a second row of tubes 1012 that are fixedly arranged in parallel, the second header 200 includes a third row of tubes 2011 and a fourth row of tubes 2012 that are fixedly arranged in parallel, the first row of tubes 1011 and the third row of tubes 2011 are arranged opposite to each other, and the second row of tubes 1012 and the fourth row of tubes 2012 are arranged opposite to each other; specifically, as shown in fig. 16 to 17, a first partition plate 5 is fixedly installed in a first row pipe 1011 to partition the first row pipe 1011 into a first upper header 1 and a second upper header 2, a second partition plate 6 is fixedly installed in a second row pipe 1012 to partition the second row pipe 1012 into a third upper header 3 and a fourth upper header 4, wherein a refrigerant inlet 8 is provided at a first end of the first upper header 1, a second end of the first upper header 1 is closed, both ends of the second upper header 2 are closed, both ends of the third upper header 3 are closed, a refrigerant outlet 7 is provided at a first end of the fourth upper header 4, a second end of the fourth upper header 4 is closed, and the second upper header 2 is communicated with the third upper header 3.

Install a plurality of condenser pipes 300 between first pressure manifold 100 and the second pressure manifold 200, condenser pipe 300 evenly spaced sets up, install fin 9 between the condenser pipe 300, the both ends of condenser pipe 300 insert first pressure manifold 100 and second pressure manifold 200 inside so that the refrigerant removes to another pressure manifold by a pressure manifold respectively, wherein, first collecting pipe 1 of going up communicates through condenser pipe 300 and fourth tubulation 2012, collecting pipe 2 passes through condenser pipe 300 and fourth tubulation 2012 intercommunication on the second, collecting pipe 3 passes through condenser pipe 300 and third tubulation 2011 intercommunication on the third, collecting pipe 4 passes through condenser pipe 300 and third tubulation 2011 intercommunication on the fourth.

Specifically, as shown in fig. 18 to 19, the fourth row of tubes 2012 is provided with the first lower header 13 and the second lower header 14 which are communicated with each other, and the third row of tubes 2011 is provided with the third lower header 16 and the fourth lower header 15 which are communicated with each other; a first drainage plate 35 is installed on a fourth row of tubes 2012, the first drainage plate 35 is obliquely and downwardly arranged along the flowing direction of the refrigerant, the first drainage plate 35 is installed in the middle of the fourth row of tubes 2012, a second drainage plate 36 is fixedly installed in a third row of tubes 2011, the second drainage plate 36 is obliquely and downwardly arranged along the flowing direction of the refrigerant, and the second drainage plate 36 is installed in the middle of the third row of tubes 2011.

Specifically, condenser pipe 300 is flat pipe, condenser pipe 300 sets up perpendicularly from top to bottom, and a plurality of condenser pipes 300 use the baffle to establish two rows as the interface, as shown in fig. 1 and fig. 4, a plurality of condenser pipes of connecting first last collecting pipe 1 and first collecting pipe 13 down are first row flat pipe 10, a plurality of condenser pipes of connecting second last collecting pipe 2 and second collecting pipe 14 down are second row flat pipe 11, a plurality of condenser pipes of connecting third last collecting pipe 3 and third collecting pipe 16 down are third row flat pipe, a plurality of condenser pipes of connecting fourth last collecting pipe 4 and fourth collecting pipe 15 down are fourth row flat pipe.

In summary, four regions in which the refrigerant flows in sequence are formed, as shown in fig. 1-2, specifically, a first region 103, a second region 104, a third region and a fourth region, where the first region 103 includes a first upper header 1, a first lower header 13 and a first row of flat tubes 10, the second region 104 includes a second upper header 2, a second lower header 14 and a second row of flat tubes 11, the third region includes a third upper header 3, a third lower header 16 and a third row of flat tubes, the fourth region includes a fourth upper header 4, a fourth lower header 15 and a fourth row of flat tubes, and the refrigerant flows out from the first upper header 4 in a zigzag manner through the first region 103, the second region 104, the third region and the fourth region.

As the speed of the refrigerant entering the first upper header 1 is relatively high, the flow speed of the refrigerant entering the first upper header 1 is relatively high, the refrigerant distribution in the inlet pipe of the evaporator in the prior art is uneven, the refrigerant flowing into the first row of flat pipes 10 is uneven, and the heat exchange of the first row of flat pipes 10 is uneven, as shown in fig. 17, in the evaporator of the invention, a flow guiding arc surface 105 is arranged on the bottom pipe wall of the first upper header 1, the flow guiding arc surface 105 can enable the flow speed change of the refrigerant to be gradually reduced, maintained unchanged and gradually increased in sequence, specifically, as shown in fig. 17, the structure of the flow guiding arc surface 105 starts from the refrigerant inlet 8 and comprises a first arc surface 106, a advection surface 108 and a second arc surface 107 which are arranged in sequence in smooth transition, and the height change of the flow guiding arc surface 105 respectively corresponds to the first arc surface 106, the advection surface 108 and the second arc surface 107 and is gradually increased, And is maintained constant and gradually reduced, wherein the height of the first cambered surface 106 starts to extend arcuately and inwardly and upwardly along the end of the refrigerant inlet 8, the advection surface 108 is joined to the highest position of the first cambered surface 106 and extends planarly, and the height of the second cambered surface 107 gradually decreases along an arc line along the advection surface 108. The effects that can be achieved in this way are: the first upper collecting pipe 1 is divided into a first section, a second section and a third section corresponding to the change of the flowing speed of the refrigerant, wherein the first section is a stage that the refrigerant initially enters the first upper collecting pipe 1, the flowing speed of the refrigerant is reduced by utilizing the drainage cambered surface, the refrigerant staying at the first section is increased, and the amount of the refrigerant entering the condensing pipe is increased; the second stage is that the initial velocity of the refrigerant has been reduced to a suitable velocity, and the flow directing arcs maintain their velocity of flow over the advection surfaces 108; in the third stage, the speed of the refrigerant flowing in the second stage is gradually increased due to the arrangement of the second cambered surface 107, so that the flow speed of the refrigerant is increased by utilizing the flow guiding cambered surface 105, and the refrigerant entering the third stage can be increased; the uniformity of refrigerant distribution in the first upper collecting pipe 1 is improved, the uniformity of refrigerant distribution in the condensation pipe connected with the first upper collecting pipe 1 is ensured, the condensation pipe connected with the first upper collecting pipe 1 and external heat exchange are uniform, the moving speed of the refrigerant can be improved, and the refrigerating efficiency is improved.

Wherein the radian of the first cambered surface 106 is R₆The radian of the second cambered surface 107 is R₇And R is₆Less than R₇，R₆And R₇Is less than 5 degrees, so that the first cambered surface 106 can rapidly reduce the flow speed of the refrigerant, and the second cambered surface 107 only improves the flow speed of the refrigerant to a certain extent, thereby avoiding the problem of uneven refrigerant distribution caused by the excessively high speed of the refrigerant on the second cambered surface 107.

Corresponding to the above-mentioned drainage arc surface 105, as shown in fig. 10, the end of the condensation pipe 303 connected with the first upper collecting pipe 1 is provided with an arc-shaped socket matched with the drainage arc surface 105, the condensation pipes 300 are installed side by side in parallel at certain intervals, that is, the interface of the first row of flat pipes 10 on the first upper collecting pipe 1 is an arc-shaped interface, and due to the height change of the drainage arc surface 105, the shape of the socket of the end of the first row of flat pipes 10 is changed in sequence, as shown in fig. 10, a specific schematic view of the first row of flat pipes 10 is shown, the first row of flat pipes 10 includes the first multi-flat pipe 17 of the first row of flat pipes, the second multi-flat pipe 18 of the first row of flat pipes and the third multi-flat pipe 19 of the first row of flat pipes, the angle of the arc-shaped socket of the port of the first multi-flat pipe 17 of the first row of flat pipes is R respectively₁、R₂、R₃、R₄、R₅And R is₁＞R₂＞R₃＞R₄＞R₅，R₁、R₂、R₃、R₄、R₅Respectively, with the magnitude of R of the first arc surface 106₆The size of the first multi-flat tube 19 is matched with that of the second multi-flat tube 18, as shown in fig. 17, which is a structure diagram of the drainage arc surface 105, the angle of the arc-shaped spigot of the first multi-flat tube 18 is zero and corresponds to the flat flow surface 108, and the angle of the arc-shaped spigot of the third multi-flat tube 19 of the first multi-flat tube is equal to the angle of the R of the second arc surface 107₇Is matched.

In order to further make the refrigerant distributed uniformly, on the basis of the above arrangement of the flow-guiding cambered surfaces 105 in the first upper header 1, as shown in fig. 10, the diameter size of the flat tubes in the first row of flat tubes 10 is gradually reduced, kept unchanged and gradually increased, the diameter of the flat tubes in the first plurality of flat tubes 17 in the first row of flat tubes is sequentially reduced, the size of the flat tubes in the first row of flat tubes in the second plurality of flat tubes 18 in the first row of flat tubes is kept unchanged, the size of the flat tubes in the third plurality of flat tubes 19 in the first row of flat tubes is gradually increased, the first plurality of flat tubes 17 in the first row of flat tubes and the third plurality of flat tubes 19 in the first row of flat tubes are arranged oppositely, the width of the flat tubes near the inlet of the first upper header 1 is large, so as to guide the refrigerant to sequentially and uniformly enter the corresponding flat tubes according to the flow sequence, and ensure that the flat tubes in the first row can uniformly exchange heat; as shown in fig. 11-14, the diameter variations of the flat tubes of the second, third and fourth rows of flat tubes 11, 10 are the same as the diameter variations of the flat tubes of the first row.

As shown in fig. 15 to 16, a first slope 30 is disposed at an end of the bottom of the inside of the first header pipe close to the refrigerant outlet, specifically, the first slope 30 is disposed at an end of the refrigerant outlet 7 of the fourth upper header pipe 4, a height of the first slope 30 decreases from the refrigerant outlet 7 to the inside of the fourth upper header pipe 4, correspondingly, as shown in fig. 14, an inclined socket matched with the first slope 30 is disposed at an end of the condenser pipe 300 inserted in a matching manner with the first slope 30, the inclined socket is a fourth row of flat pipe arc 29, and the first slope 30 is used to reduce a flow speed of the refrigerant, so that the refrigerant can be more uniformly distributed to the flat pipes correspondingly connected to the fourth upper header pipe 4.

In the process that the refrigerant moves along the length direction of the collecting pipe, because the flow speed of the refrigerant gradually decreases in the process that the refrigerant moves from one side of the collecting pipe to the other side, in order to increase the flow speed of the refrigerant, as shown in fig. 18-19, the bottom surface of the second lower collecting pipe 14 is provided with a third slope surface 33, the third slope surface 33 and the second lower collecting pipe 14 are integrally formed, the bottom inside the fourth lower collecting pipe 15 is provided with a second slope surface 32, and the second slope surface 32 and the fourth lower collecting pipe 15 are integrally formed for increasing the flow speed of the refrigerant when the refrigerant moves.

In order to further reduce the flow velocity of the refrigerant entering the first upper header 1 and improve the uniformity of refrigerant distribution, a boss 31 with a length extending along the flow direction of the refrigerant is arranged on the upper pipe wall in the first upper header 1, as shown in fig. 17, the boss 31 is arranged opposite to the first arc surface 106, the boss 31 is welded or bolted with the first upper header 1, the height of the downward protrusion of the boss 31 is gradually reduced, the boss 31 is long and long, or as shown in fig. 17, the boss 31 can be arranged in a plurality of blocks and arranged in rows at intervals along the flow direction of the refrigerant, so that the height of the downward protrusion of the bosses 31 is gradually reduced for reducing the flow velocity of the refrigerant.

The working principle is as follows: a refrigerant enters the first upper collecting pipe 1 through a refrigerant inlet 8 of the first upper collecting pipe 1 and then enters the first lower collecting pipe 13 through a first row of flat pipes, the first lower collecting pipe 13 is communicated with the second lower collecting pipe 14, a first lower drainage plate 35 with a certain inclination is processed between the first lower collecting pipe 13 and the second lower collecting pipe 14, the flow rate of the refrigerant is reduced, a third slope surface 33 is arranged at the bottom of the second lower collecting pipe 14, the refrigerant is guided to rapidly enter the rear side of the second lower collecting pipe 14, and meanwhile, the flow of the refrigerant of the first row of flat pipes 10 is enabled to be smoother; the refrigerant enters the second row of flat tubes 11 through the second lower collecting tube 14, the refrigerant enters the second upper collecting tube 2 through the second row of flat tubes 11, the second upper collecting tube 2 is communicated with the third upper collecting tube 3, then the refrigerant enters the third lower collecting tube 16 through the third row of flat tubes by the third upper collecting tube 3, the third lower collecting tube 16 is communicated with the fourth lower collecting tube 15, a second slope 32 is arranged at the bottom of the fourth lower collecting tube 15, the refrigerant is guided to rapidly enter the rear side of the fourth lower collecting tube 15, then the refrigerant enters the fourth upper collecting tube 4 through the fourth row of flat tubes, a first slope 30 for reducing the speed of the refrigerant is processed at the outlet of the fourth upper collecting tube 4, the refrigerant is enabled to fully exchange heat at the evaporator, and finally flows out of the evaporator.

Compared with the prior art, the invention has the advantages that the structure of the existing evaporator is slightly changed, and the processing and the realization are easy; the refrigerant distribution in the flat tube can be adjusted, the uniform heat exchange of the automobile evaporator is ensured, and the efficiency is improved; the radius of the drainage cambered surface and the gradient of the collecting pipe can be matched according to the reasonable design of flow and structure, so that the refrigerating efficiency is improved.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The evaporator is characterized by comprising a first collecting pipe and a second collecting pipe which are arranged at a preset distance and are opposite to each other, wherein a plurality of condensation pipes are arranged between the first collecting pipe and the second collecting pipe, two ends of each condensation pipe are respectively inserted into the first collecting pipe and the second collecting pipe so that a refrigerant can move from the first collecting pipe to the second collecting pipe, the first collecting pipe is provided with a refrigerant inlet which is connected with an external refrigerant pipeline, the bottom of the inside of the first collecting pipe is provided with a drainage arc surface which extends from the refrigerant inlet to the inside of the first collecting pipe, the height of the drainage arc surface is increased from the refrigerant inlet to the inside of the first collecting pipe and then is reduced, and a structure with large middle part and small ends is formed, and the structure is observed from the longitudinal section direction of the first collecting pipe.

2. The evaporator of claim 1, wherein said first header has a refrigerant outlet for connection to an external refrigerant line, and wherein the bottom of the interior of said first header has a first ramp surface at an end adjacent to said refrigerant outlet, said first ramp surface having a height that decreases from said refrigerant outlet to the interior of said first header.

3. The evaporator according to claim 1, wherein the second collecting pipe is provided with a refrigerant outlet for connecting with an external refrigerant pipe, one end of the bottom of the inside of the second collecting pipe, which is close to the refrigerant outlet, is provided with a first slope, and the height of the first slope decreases from the refrigerant outlet to the inside of the second collecting pipe.

4. An evaporator according to claim 3 wherein the end of the condenser tube mating with the first ramp is provided with an angled spigot mating with the first ramp.

5. The evaporator according to any of claims 1 to 4, wherein the bottom of the interior of the first header is further provided with at least one second ramp, the height of the second ramp decreasing in the direction of flow of the refrigerant.

6. An evaporator according to claim 5 wherein the plurality of condenser tubes disposed opposite said second ramp have decreasing tube diameters and increasing tube diameters.

7. An evaporator according to any one of claims 1 to 4 wherein the plurality of condenser tubes disposed opposite the arc-directing surfaces have their tube diameters first reduced and then increased.

8. The evaporator of claim 1, wherein the flow-guiding arc surface comprises a first arc surface, a advection surface and a second arc surface which are arranged in a smooth transition mode in sequence, the first arc surface and the second arc surface are arc protrusions protruding out of the tube wall, and two ends of the advection surface are respectively tangent to the arc protrusions of the first arc surface and the arc protrusions of the second arc surface.

9. The steamer of claim 8The hair pin is characterized in that the radius of the first cambered surface is R₆The radius of the second cambered surface is R₇And R is₆Less than R₇。

10. The evaporator according to claim 8, wherein a boss is further provided on a top portion of a tube wall of the first header at an end portion thereof close to the refrigerant inlet, the tube wall being opposite to the first cambered surface, and the height of the downward projection of the boss is gradually reduced.

11. The evaporator as recited in claim 10, wherein said bosses are plural in a row spaced apart in a flow direction of refrigerant, and a height of a downward projection of said plural bosses is gradually reduced.

12. The evaporator of claim 1, wherein the end of the condensation tube is provided with an arc-shaped socket matched with the arc-shaped drainage surface.

13. The evaporator according to any one of claims 2 to 4, wherein the first header comprises a first array of tubes and a second array of tubes arranged in parallel; the first row of pipes comprise a first upper collecting pipe and a second upper collecting pipe, the refrigerant inlet is arranged at the first end part of the first upper collecting pipe, the drainage arc surface is arranged in the first upper collecting pipe, the second end part of the first upper collecting pipe is closed, and the two ends of the second upper collecting pipe are closed; the second row of tubes comprises a third upper collecting tube and a fourth upper collecting tube, the second upper collecting tube is communicated with the third upper collecting tube, two ends of the third upper collecting tube are sealed, the refrigerant outlet is arranged at the first end part of the fourth upper collecting tube, and the second end part of the fourth upper collecting tube is sealed;

14. The evaporator of claim 13, wherein the top of the interior of the third row of tubes is provided with a first flow-guiding plate disposed obliquely downward in the refrigerant flow direction;

and a second drainage plate which is obliquely and downwardly arranged along the flowing direction of the refrigerant is arranged at the top of the inner part of the fourth tube array.

15. The evaporator of claim 14, wherein the first flow guide plate is disposed in the middle of the third row of tubes and the second flow guide plate is disposed in the middle of the fourth row of tubes.