CN215765867U - Evaporator - Google Patents

Abstract

The utility model discloses an evaporator which comprises a pipeline main body, a plurality of bullet heads, an air inlet pipe and a capillary pipe which are communicated with the inlet end of a gas-liquid channel, a liquid outlet pipe which is communicated with the outlet end of the gas-liquid channel, and inserting pieces which are equal in number to the bullet heads, wherein each inserting piece is respectively arranged in the bullet heads, and a runner in the pipeline main body and the bullet heads is constructed into a labyrinth runner; the pipeline main body is spliced into a whole from top to bottom by apron and bottom plate, and the bottom plate is whole to be platelike structure and offers a plurality of mounting holes that are used for installing the bullet, and the apron constitutes to have gas-liquid channel and apron to weld on the bottom plate towards one side of bottom plate. According to the technical scheme, the main body parts are manufactured by the novel processes of stamping, stretching, laser automatic welding, magnetic cleaning and the like instead of the traditional processes of bending, necking, welding wire welding, electroplating and the like, and compared with the existing stainless steel evaporator manufacturing process, the novel process avoids the process defects of bending springback, uncontrollable welding deformation and the like, and is more efficient, economic, sanitary and environment-friendly.

Description

Evaporator

Technical Field

The utility model relates to the technical field of evaporation equipment for ice making machines, in particular to an evaporator.

Background

The evaporator is the core component in the ice making machine, the working principle is that the cooling liquid flows according to a certain flow sequence, water is used for making ice, and in the ice removing process, hot gas flows according to the same flow sequence, so that the temperature of the evaporator is raised for ice removing. Specifically, the coolant liquid in the capillary gets into the evaporimeter, flows according to the order that bullet warhead arranged one by one, and when the ice-making was accomplished, the hot-air in the compressor passed through the intake pipe and gets into, extrudes the evaporimeter with the coolant liquid through the drain pipe, and for the process of deicing simultaneously, when next round ice-making began, the coolant liquid in the capillary was with the air extrude the evaporimeter through the drain pipe, circulates in proper order. Refer to the 'a refrigerating mechanism for ice machine' of the domestic patent with application number 201621059758.3, including compressor, evaporimeter, the evaporimeter is including the U-shaped pipe of horizontal placing, the lower extreme of U-shaped pipe is downward protrusion and is formed with a plurality of branch pipes, the upper end and the U-shaped pipe intercommunication of branch pipe, the lower extreme of branch pipe is sealed, when the compressor was operated, the evaporimeter cooling was so that the periphery of branch pipe condenses into ice, later utilized two-way solenoid valve to go out the high pressure steam of compressor output and is transmitted to the evaporimeter, the evaporimeter heaies up so that the ice-cube on the branch pipe drops.

The above patent can realize the manufacture of the evaporator in the refrigerator and the basic working requirements thereof, but the main structure of the evaporator relates to the processes of bending, necking and the like, and the problems of material rebound, high operation difficulty and the like in the evaporator are neglected. Although the above-mentioned patent also employs laser welding, the factors of uncontrollable deformation caused by welding are ignored and thus are unlikely to be realized.

Therefore, an evaporator capable of solving at least one of the above technical problems is required to meet the requirements of production process upgrading and product upgrading strategies.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned problems of the prior art, there is now provided an evaporator which is fully feasible with a new manufacturing process and at the same time a large-scale production capacity, in order to overcome the above-mentioned technical drawbacks.

The specific technical scheme is as follows:

an evaporator comprises a pipeline main body with a gas-liquid channel inside, a plurality of bullet heads which are arranged on the lower end face of the pipeline main body and are integrally in a tubular structure with a closed lower end and an open upper end, a gas inlet pipe and a capillary pipe which are communicated with the inlet end of the gas-liquid channel, a liquid outlet pipe which is communicated with the outlet end of the gas-liquid channel, and inserting pieces which are as many as the bullet heads, wherein each inserting piece is respectively arranged in the bullet head, and a runner in the pipeline main body and the bullet head is constructed into a labyrinth runner;

the pipeline main body is spliced into a whole from top to bottom by apron and bottom plate, and the bottom plate is whole to be platelike structure and offers a plurality of mounting holes that are used for installing the bullet, and the apron constitutes to have gas-liquid channel and apron to weld on the bottom plate towards one side of bottom plate.

Preferably, the diameter of the outer edge of the upper end of the bullet head is larger than that of the outer edge of the lower end of the bullet head, and the outer edge of the upper end of the bullet head is tightly matched with the mounting hole and is welded and fixed.

Preferably, the mounting hole is punched from the bottom plate, an annular arc-shaped flanging is formed on the upper edge of the mounting hole in the punching process, and an arc-shaped skirt edge matched with the arc-shaped flanging in shape is arranged on the periphery of the upper edge of the bullet head.

Preferably, the inner space of each bullet head and at least one part of the gas-liquid channel form a circulation space, each inserting piece is respectively arranged in one circulation space and divides the circulation space into circulation flow channels with U-shaped cross sections, and all the circulation flow channels and the gas-liquid channel form a labyrinth flow channel together.

Preferably, the bottom plate, the cover plate and the bullet head are all made of stainless steel materials, and the inserting pieces are made of red copper materials.

Preferably, the air inlet pipe, the liquid outlet pipe and the capillary are uniformly distributed below the bottom plate, and the end part of the capillary is bent and then is connected into the gas-liquid channel from bottom to top.

Preferably, the air inlet pipe, the liquid outlet pipe and the capillary are uniformly distributed at the upper end of the cover plate, and the end part of the air inlet pipe, the liquid outlet pipe and the capillary is bent and then is connected into the gas-liquid channel from top to bottom.

Preferably, two compensation plates matched with the gas-liquid channel in shape are reserved on one side of the bottom plate, openings used for exposing the inlet end and the outlet end of the gas-liquid channel are formed in one side of the cover plate, the compensation plates are turned upwards to seal the openings and are fixedly connected in a welding mode, one end of the gas inlet pipe and one end of the capillary pipe are connected to one of the compensation plates, and one end of the liquid outlet pipe is connected to the other compensation plate.

Preferably, the number of the bullet heads is nine, and the bullet heads are uniformly arranged on the bottom plate.

Preferably, plate ribs are reserved at positions, close to the air inlet pipe, the liquid outlet pipe and the capillary, on the bottom plate and the cover plate respectively.

Preferably, one end of the liquid outlet pipe, which is adjacent to the connecting bottom plate, is of a flat pipe structure.

The beneficial effects of the above technical scheme are that:

the evaporimeter includes the pipeline main part, the bullet head, the intake pipe, the drain pipe, the capillary, the inserted sheet, and the pipeline main part comprises bottom plate and apron looks welding, compare with the scheme that the pipeline main part is buckled and is formed by a whole root tubular product in the current scheme, main part spare part abandons the return bend in this scheme, the throat, traditional technologies such as welding wire welding, electroplating, and adopt novel technologies such as punching press drawing, laser automatic weld, magnetic force washing, compare with current stainless steel evaporimeter preparation technology, this technology has avoided technological defects such as return bend resilience, uncontrollable deformation of welding, it is more high-efficient, economy, health, environmental protection.

Drawings

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

FIG. 2 is an exploded view of a first embodiment of the evaporator of the present invention;

FIG. 3 is a partial cross-sectional view of a first evaporator embodiment of the utility model;

FIG. 4 is a perspective view of a first evaporator of the present invention with the cover plate removed;

FIG. 5 is an enlarged view of a portion I of FIG. 3;

FIG. 6 is a partial cross-sectional view of a second evaporator embodiment of the present invention;

FIG. 7 is a partial cross-sectional view of a third evaporator embodiment of the present invention;

FIG. 8 is a side elevational view of a third embodiment of an evaporator of the present invention;

FIG. 9 is a top view of the bottom plate and cover plate of an evaporator according to the present invention in a process state of welding;

FIG. 10 is a top view of the bottom plate and cover plate of a fourth exemplary evaporator of the present invention in a process state of welding;

FIG. 11 is a plan view showing the state of the welding process of the bottom plate and the cover plate in the fifth embodiment of the evaporator of the present invention.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the utility model easy to understand, the following embodiments are specifically described with reference to the attached drawings. And defines the top-down direction as viewed on the paper in fig. 3 as the top-down direction in this embodiment.

In the first embodiment, the first step is,

referring to fig. 1 to 4 and 9, the evaporator provided in this embodiment includes a pipeline main body having a gas-liquid channel 5 therein, a plurality of bullet heads 4 installed on a lower end surface of the pipeline main body and having a tubular structure with a closed lower end and an open upper end, a gas inlet pipe 8 and a capillary 7 connected to an inlet end of the gas-liquid channel 5, a liquid outlet pipe 9 connected to an outlet end of the gas-liquid channel 5, and a number of insert pieces 3 equal to that of the bullet heads 4, wherein each insert piece 3 is respectively disposed in the bullet head 4 and configures a flow channel in the pipeline main body and the bullet head 4 into a labyrinth flow channel;

wherein, the pipeline main part is as an organic whole by apron 1 and bottom plate 2 concatenation from top to bottom, and bottom plate 2 wholly is platelike structure and offers a plurality of mounting holes 6 that are used for installing bullet head 4, and apron 1 constitutes to have foretell gas-liquid channel 5 and apron 1 to weld on bottom plate 2 towards one side of bottom plate 2.

Based on above-mentioned technical scheme, the evaporimeter includes the pipeline main part, bullet 4, intake pipe 8, drain pipe 9, capillary 7, inserted sheet 3, and the pipeline main part comprises bottom plate 2 and apron 1 looks welding, compare with the scheme that the pipeline main part was formed by a whole root tubular product bending type in the current scheme, traditional technologies such as return bend, throat, welding wire welding, electroplating are abandoned to main part spare part in this scheme, and adopt novel technologies such as punching press drawing, laser automatic weld, magnetic force washing, compare with current stainless steel evaporimeter preparation technology, this technology has avoided the return bend resilience, technological defects such as welding uncontrollable deformation, it is more high-efficient, economy, health, environmental protection.

In a preferred embodiment, as shown in fig. 2 to 5 in particular, in this embodiment, the outer diameter of the upper end of the bullet 4 is larger than that of the lower end thereof, and the outer edge of the upper end of the bullet 4 is fitted into the mounting hole 6 and fixed by welding. Specifically, the outer edge diameter of the upper end of the bullet head 4 is not smaller than the inner diameter of the mounting hole 6, the bullet head 4 is placed into the mounting hole 6 from top to bottom in the matching process, and the bullet head 4 is pressed downwards to the position where the upper end face is flush with the upper end face of the bottom plate 2 in an assembling tool. Further, as shown in fig. 5, the mounting hole 6 is punched from the bottom plate 2, and an annular arc-shaped flange 11 is formed on the upper edge of the mounting hole 6 in the punching process, and an arc-shaped skirt matched with the arc-shaped flange 11 in shape is arranged on the periphery of the upper edge of the bullet head 4, so that the connection strength and the sealing effect between the two can be further enhanced. It is worth pointing out that in the present embodiment, the bullet head 4 adopts a shape with thick mouth wall and thin bottom, and the thick mouth structure meets the requirement of laser welding on the minimum wall thickness (0.3mm) of the material while ensuring the efficiency of bottom refrigeration. Further, the gas-liquid channel 5 is formed in a U shape as a whole.

As a further preferred embodiment, in combination with fig. 3, the inner space of each bullet 4 and at least a part of the gas-liquid channel 5 constitute a circulation space, each insert 3 is respectively arranged in one circulation space and divides the circulation space into circulation flow channels with the cross-sections being U-shaped, and all the circulation flow channels and the gas-liquid channel 5 together constitute the above-mentioned labyrinth flow channel. Further, in this embodiment, the base plate 2, the cover plate 1 and the bullet head 4 are all made of stainless steel material, and the insertion piece 3 is made of red copper material, so that in the process of pressing and assembling the insertion piece 3, sealing can be realized through deformation of the red copper, and side leakage of the cooling liquid is prevented. Compared with the manufacturing process of a red copper evaporator, the manufacturing process of the stainless steel evaporator is more efficient, economical, sanitary and environment-friendly, and meanwhile compared with the existing manufacturing process of the stainless steel evaporator, the manufacturing process of the stainless steel evaporator is extremely high in feasibility, greatly improves the production efficiency and reduces the production difficulty.

In a preferred embodiment, as shown in fig. 2 to 4, the gas inlet pipe 8, the liquid outlet pipe 9 and the capillary 7 are all disposed below the bottom plate 2 and have ends bent to connect into the gas-liquid channel 5 from bottom to top. The design can avoid the problem that each pipeline is blocked by light in the process of annular laser welding between the peripheries of the base plate 2 and the cover plate 1, so that the product is only arranged in one clamp from the beginning of installation to the end of welding, a semi-finished product is not taken out midway, and the precision of the product is effectively ensured. Meanwhile, the tubes are moved to the cover plate 1 from the side surface, so that the process and the reject ratio are reduced while the product function is ensured.

As a further preferred embodiment, the number of bullet heads 4 is nine, and they are uniformly arranged on the base plate 2. Furthermore, the bottom plate 2 and the cover plate 1 are respectively reserved with a plate rib 12 at the positions close to the air inlet pipe 8, the liquid outlet pipe 9 and the capillary tube 7 to strengthen the structural strength of the port part, and the middle part is cut, so that the whole structure is more simplified and portable, and the evaporator is suitable for being applied to refrigeration equipment. As shown in fig. 2 and 4 again, after welding and cutting, the base plate 2 and the cover plate 1 are formed into a square shape as a whole in a top view. Further, the provision of the plate ribs 12 can effectively prevent the deformation of the work and can reduce the cold absorption to enhance the cooling efficiency.

In the specific application, cooling liquid enters the gas-liquid channel 5 through the capillary 7 and flows out of the liquid outlet pipe 9 through the labyrinth flow channel, and ice is made on the external liquid by the bullet heads 4 in the process, and the external liquid flows according to the sequence of arrangement of the bullet heads 4; after the ice making is finished, air in the compressor enters the gas-liquid channel 5 through the air inlet pipe 8, the cooling liquid is extruded out through the liquid outlet pipe 9 along the labyrinth flow channel, and when the next round of ice making starts, the actions are executed again and the circulation operation is performed in sequence.

As shown in fig. 9, in the process of welding the bottom plate 2 and the cover plate 1, the present embodiment is divided into a penetration welding (shown as a part a) at the middle part and a rotary laser welding (shown as a part B) at the outer periphery to weld the two into a whole, and after welding, the middle part needs to be partially cut into the shape shown in fig. 1. In the process of the rotary laser welding, the air inlet pipe 8, the liquid outlet pipe 9 and the capillary 7 are positioned below the bottom plate 2, so that the technical problem of light blocking in the process of the rotary laser welding can be solved, a product is only arranged in one clamp from the beginning of installation to the end of welding, a semi-finished product does not need to be taken out midway, and the precision of the product is guaranteed.

As a further preferred embodiment, the end of the outlet pipe 9 adjacent to the connecting bottom plate 2 is of flat pipe structure. So as to ensure the distance between the liquid outlet pipe 9 and the liquid level in the refrigerator under the working state of the device and avoid the mutual cold and hot interference.

In the second embodiment, the first embodiment of the method,

referring to fig. 6, the technical content and the technical features of the present embodiment are substantially the same as those of the above-mentioned embodiment, and the difference is that in the present embodiment, the gas inlet pipe 8, the liquid outlet pipe 9, and the capillary 7 are uniformly disposed at the upper end of the cover plate 1, and the end portion of the gas inlet pipe is bent to be connected to the gas-liquid channel 5 from top to bottom. Specifically, the cover plate 1 is provided with openings for installing three pipelines, and the three pipelines are welded in the openings, so that the basic requirements of the evaporator can be met.

However, in the assembly welding process of the bottom plate 2 and the cover plate 1, because the annular laser welding process in a set of tooling equipment is mainly adopted in the scheme, the phenomenon that three pipelines block light can occur, and the welding between the bottom plate and the cover plate needs to be completed through multiple processes, but the use of the product is not influenced.

In the third embodiment, the first step is that,

referring to fig. 7 and 8, the technical content and technical features of this embodiment are substantially the same as those of the first embodiment, except that in this embodiment, two compensation plates 10 having shapes matching with the gas-liquid channel 5 are reserved on one side of the bottom plate 2, and a notch for exposing the inlet end and the outlet end of the gas-liquid channel 5 is formed on one side of the cover plate 1, the compensation plates 10 are turned upwards to close the notch and are welded and fixedly connected, one end of the gas inlet pipe 8 and one end of the capillary pipe 7 are respectively connected to one of the compensation plates 10, and one end of the liquid outlet pipe 9 is connected to the other compensation plate 10, so as to form a shape in which three pipes are arranged in parallel as shown in fig. 7 and 8, which can also achieve the basic requirements of the evaporator.

In this scheme, because three pipelines directly set up in the lateral part of pipeline main part, can not influence the operation of hoop laser welding between bottom plate 2 and the apron 1, it is more nimble to walking the line of three pipelines under its user state.

It should be noted that, based on the different design schemes of the three pipelines in the above three embodiments, it is actually considered that the three pipelines are respectively arranged, for example, the three pipelines are respectively arranged in three different manners in the first to third embodiments, which does not affect the specific application of the apparatus and is not limited thereto.

In the fourth embodiment, the first step is that,

referring to fig. 10, the technical content and the technical features of the present embodiment are substantially the same as those of the above-mentioned embodiment, except that in the present embodiment, welding spaces (e.g., portion D shown in the drawing) for penetration welding are reserved at the outer edge positions of the bottom plate 2 and the cover plate 1, and in the process of welding the bottom plate 2 and the cover plate 1, the present embodiment includes steps of penetration welding at the middle portion (e.g., portion C shown in the drawing) and penetration welding at the outer edge (e.g., portion D shown in the drawing) to weld the two into a whole, and after welding, the middle portion and the outer edge portion need to be partially cut into the shape shown in fig. 1. In the process of the rotary laser welding, the air inlet pipe 8, the liquid outlet pipe 9 and the capillary 7 are positioned below the bottom plate 2, so that the technical problem of light blocking in the process of the rotary laser welding can be solved, a product is only arranged in one clamp from the beginning of installation to the end of welding, a semi-finished product does not need to be taken out midway, and the precision of the product is guaranteed.

In the fifth embodiment, the first step is,

referring to fig. 11, the technical content and the technical features of the present embodiment are substantially the same as those of the first embodiment, except that in the present embodiment, in the process of welding the bottom plate 2 and the cover plate 1, the process is divided into a penetration welding (E shown in the figure) step at the middle portion and a laser welding (F shown in the figure) step at the outer edge to weld the two into a whole, and after the welding, the bottom plate 2 and the cover plate 1 at the middle portion and the outer edge of the bottom plate 2 need to be partially cut into the shape shown in fig. 1. In the process of the rotary laser welding, the air inlet pipe 8, the liquid outlet pipe 9 and the capillary 7 are positioned below the bottom plate 2, so that the technical problem of light blocking in the process of the rotary laser welding can be solved, a product is only arranged in one clamp from the beginning of installation to the end of welding, a semi-finished product does not need to be taken out midway, and the precision of the product is guaranteed. Specifically, the outer edge of the bottom plate 2 is reserved with a welding space, and the outer edge of the cover plate 1 is not reserved with a welding space.

In the sixth embodiment, the process is carried out,

the present embodiment is a manufacturing process of an evaporator based on the first to fifth embodiments, and the manufacturing process includes:

step one, in a mounting fixture, placing bullet heads 4 into mounting holes 6 of a bottom plate 2 one by one through the mounting fixture, hanging the bullet heads 4 on the bottom plate 2 because the diameter of the upper edges of the bullet heads is not smaller than the inner diameter of the mounting holes 6, and pressing the bullet heads 4 into the mounting holes 6 from top to bottom by pressing equipment;

secondly, placing the mounting fixture of each part assembled in the first step on a laser welding machine to weld the outer edge of the mouth of the bullet head 4 and the bottom plate 2; this operation is aimed at a reshaping repair by a corresponding mold due to a reduction in the inner diameter of the bullet 4 caused by a spot of weld between the bullet 4 and the base plate 2 after welding.

Pressing the inserting piece 3 into the welded and shaped bullet head 4 according to a preset direction, and splicing the cover plate 1 on the bottom plate 2;

clamping the cover plate 1 and the bottom plate 2 by a clamping device, and sequentially fixing the middle part and the outer edge part of the cover plate and the bottom plate by spot welding;

and step five, removing the clamping device, moving the spot-welded workpiece and the mounting fixture to another laser welding machine, welding and fixing the middle parts of the base plate 2 and the cover plate 1, and welding and fixing the outer edges of the base plate 2 and the cover plate 1 by rotating the workpiece and/or a laser head on the laser welding machine.

Based on above-mentioned technical scheme, the pipeline main part comprises bottom plate 2 and apron 1 welding mutually, compares with the scheme that the pipeline main part was formed by a whole root tubular product bending in the current scheme, and traditional technologies such as return bend, throat, welding wire welding, electroplating are abandoned to main part spare part in this scheme, and adopt novel technologies such as punching press drawing, laser automatic weld, magnetic force washing, compares with current stainless steel evaporimeter manufacture craft, and this technology has avoided technological defects such as return bend resilience, welding uncontrollable deformation, and is more high-efficient, economic, sanitary, environmental protection.

In a preferred embodiment, the method further comprises: sixthly, moving the welded product out of the laser welding machine, and performing cutting operation in a stamping or laser cutting mode;

as a further preferred embodiment, the method further comprises: and seventhly, performing ultrasonic or laser cleaning or magnetic cleaning and polishing operation on the product, and drying to form a final finished product.

In a preferred embodiment, referring to fig. 9, in step five, the process of welding and fixing the outer edges of the base plate 2 and the cover plate 1 is as follows: the outer edges of the base plate 2 and the cover plate 1 are laser welded. Specifically, the laser head is welded in the horizontal direction, that is, in the direction completely radial to the workpiece.

In a preferred embodiment, referring to fig. 10, in step five, the process of welding and fixing the outer edges of the base plate 2 and the cover plate 1 is as follows: the outer edges of the base plate 2 and the cover plate 1 are laser penetration welded. Specifically, the laser head is welded in the vertical direction.

In a preferred embodiment, as shown in fig. 11, the outer edge of the bottom plate 2 is larger than the outer edge of the cover plate 1, and the outer edge of the cover plate 1 forms a connecting seam on the bottom plate 2, and in step five, the outer edges of the bottom plate 2 and the cover plate 1 are welded and fixed by the following process: and performing laser welding on the connecting seam. Specifically, the laser head and the horizontal plane form an included angle of 2-5 degrees for radial welding.

In a preferred embodiment, in step five, the process of welding and fixing the middle parts of the bottom plate 2 and the cover plate 1 comprises the following steps: the intermediate portions of the base plate 2 and the cover plate 1 are laser penetration welded. Specifically, the laser head is welded in the vertical direction.

In a preferred embodiment, step b is further included between step four and step five: cutting the middle parts of the bottom plate 2 and the cover plate 1 to cut off preset redundant parts;

in the fifth step, the process of welding and fixing the middle parts of the bottom plate 2 and the cover plate 1 comprises the following steps: the edge portions cut from the middle portions of the base plate 2 and the cover plate 1 are laser-welded by rotating the workpiece and/or a laser head on a laser welding machine. Specifically, the laser head is welded in the vertical direction. Specifically, the laser head and the horizontal plane form an included angle of 2-5 degrees for radial welding. The cutting operation may be, but is not limited to, mechanical cutting or laser cutting. The above-described cutting away of the preset surplus portion refers to a form in which the a portion shown in fig. 9 is cut into the middle portions of the bottom plate 2 and the cover plate 1 shown in fig. 1. In a preferred embodiment, as shown in fig. 3 and 4, the bottom plate 2 is further provided with holes for assembling the air inlet pipe 8, the liquid outlet pipe 9 and the capillary 7, and the first step further comprises a step of: and the gas inlet pipe 8, the liquid outlet pipe 9 and the capillary 7 are pre-mounted on the bottom plate 2 through mounting fixtures and are compressed, and the gas inlet pipe 8, the liquid outlet pipe 9 and the capillary 7 are synchronously laser-welded on the bottom plate 2 in the step two.

In a preferred embodiment, as shown in fig. 6, a hole site for installing the air inlet pipe 8, the liquid outlet pipe 9, and the capillary 7 is further formed on the cover plate 1, and the air inlet pipe 8, the liquid outlet pipe 9, and the capillary 7 are welded on the cover plate 1.

In a preferred embodiment, as shown in fig. 7 and 8, two compensating plates 10 that match the shape of the gas-liquid channel 5 are reserved on one side of the bottom plate 2, and a notch is formed on one side of the cover plate 1 to expose the inlet end and the outlet end of the gas-liquid channel 5, the compensating plates 10 are turned upwards to close the notch and are welded and fixedly connected, one end of the gas inlet pipe 8 and one end of the capillary 7 are respectively connected to one of the compensating plates 10, and one end of the liquid outlet pipe 9 is connected to the other compensating plate 10, so as to form a shape in which three pipes are arranged in parallel as shown in fig. 7 and 8.

It is worth pointing out that the bullet head 4 is made by stainless steel continuous drawing die, and is made into a product with uniform inner diameter, large outer diameter opening and small bottom, namely, the wall thickness opening is thick (0.34mm) and the bottom is thin (within 0.28 mm). The mouth of the bullet head 4 is also provided with a flanging (the diameter of the cutting edge is larger than the maximum external diameter by 0.05mm) so as to facilitate the subsequent mass production. The cover plate 1 is manufactured by stretching a die, the U-shaped part is stretched, the original pipe bending process is abandoned, the port sealing is realized, and one welding process can be reduced. The inserting piece 3 is cut by punching or laser, the width of the inserting piece 3 is consistent with the inner diameter of the bullet head 4, tight fit is realized, the head of the inserting piece 3 is mushroom-shaped and is consistent with the inner shape of the bottom plate 2, and tight fit is also realized. The inserting piece 3 is made of red copper, and aims to realize tight fit by utilizing the good ductility property of the red copper and the stainless steel material to deform when being matched in the installation process. The air inlet pipe 8, the liquid outlet pipe 9 and the capillary tube 7 are bent into a required shape through a pipe bending machine.

And, as shown in fig. 5, in a preferred scheme, the edge of the mounting hole 6 of the bottom plate 2 is provided with an arc-shaped flanging, and the flanging is slightly opened upwards. During normal assembly, the two planes clamp together without any gap, while one plane with an angle can seal during clamping. In the fourth step and the fifth step, the sequence of spot welding and electric welding is from inside to outside, so that the problem that a gap exists between the cover plate 1 and the bottom plate 2 due to deformation during welding is solved, and defective products are generated. All the time, the evaporator of the scheme is only arranged in one clamp from the beginning of installation to the end of welding, and a semi-finished product is not taken out midway, so that the precision of the product can be effectively ensured.

The foregoing is merely a preferred embodiment of the utility model, which is intended to be illustrative and not limiting. It will be understood by those skilled in the art that various changes, modifications and equivalents may be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (11)

1. An evaporator comprises a pipeline main body, a plurality of bullet heads (4), an air inlet pipe (8), a capillary pipe (7), a liquid outlet pipe (9) and inserting pieces (3), wherein the pipeline main body is internally provided with an air-liquid channel (5), the bullet heads are arranged on the lower end face of the pipeline main body and integrally have a tubular structure, the lower end of the bullet heads is closed, the upper end of the bullet heads is open, the air inlet pipe (8) and the capillary pipe (7) are communicated with the inlet end of the air-liquid channel (5), the liquid outlet pipe (9) is communicated with the outlet end of the air-liquid channel (5), the inserting pieces (3) are equal in number to the bullet heads (4), each inserting piece (3) is respectively arranged in the bullet head (4), and a flow channel in the pipeline main body and the bullet heads (4) is constructed into a labyrinth flow channel; it is characterized in that the preparation method is characterized in that,

the pipeline main body is spliced into a whole from top to bottom by cover plate (1) and bottom plate (2), bottom plate (2) wholly is platelike structure and offers a plurality of mounting holes (6) that are used for installing bullet head (4), cover plate (1) towards one side of bottom plate (2) constitutes to have gas-liquid channel (5) just cover plate (1) weld in on bottom plate (2).

2. The evaporator according to claim 1, wherein the outer diameter of the upper end of the bullet head (4) is larger than that of the lower end thereof, and the outer diameter of the upper end of the bullet head (4) is fitted into the mounting hole (6) and fixed by welding.

3. The evaporator as recited in claim 2, characterized in that the mounting hole (6) is punched from the bottom plate (2), and an annular arc-shaped flange (11) is formed on the upper edge of the mounting hole (6) during punching, and the periphery of the upper edge of the bullet head (4) is provided with an arc-shaped skirt matched with the shape of the arc-shaped flange (11).

4. The evaporator according to claim 1, wherein an inner space of each bullet head (4) and at least a part of the gas-liquid channel (5) constitute a circulation space, each of the blades (3) is disposed in one of the circulation spaces and divides the circulation space into circulation flow channels having a U-shaped cross section, and all of the circulation flow channels and the gas-liquid channel (5) constitute the labyrinth flow channel.

5. The evaporator according to claim 1, wherein the base plate (2), the cover plate (1), and the bullet heads (4) are made of stainless steel material, and the blades (3) are made of red copper material.

6. The evaporator according to claim 1, wherein the gas inlet pipe (8), the liquid outlet pipe (9) and the capillary tube (7) are uniformly arranged at the lower position of the bottom plate (2), and the end parts of the gas inlet pipe, the liquid outlet pipe and the capillary tube are bent and then are connected into the gas-liquid channel (5) from bottom to top.

7. The evaporator according to claim 1, wherein the gas inlet pipe (8), the liquid outlet pipe (9) and the capillary tube (7) are uniformly arranged at the upper end of the cover plate (1), and the end parts of the gas inlet pipe, the liquid outlet pipe and the capillary tube are bent and then connected into the gas-liquid channel (5) from top to bottom.

8. The evaporator according to claim 1, wherein two compensating plates (10) which are matched with the gas-liquid channel (5) in shape are reserved on one side of the bottom plate (2), gaps for exposing the inlet end and the outlet end of the gas-liquid channel (5) are formed in one side of the cover plate (1), the compensating plates (10) are turned upwards to seal the gaps and are fixedly welded, one end of the gas inlet pipe (8) and one end of the capillary pipe (7) are respectively connected to one of the compensating plates (10), and one end of the liquid outlet pipe (9) is connected to the other compensating plate (10).

9. An evaporator according to claim 1 wherein the number of bullet heads (4) is nine and is uniformly arranged on the base plate (2).

10. The evaporator according to claim 1, characterized in that the bottom plate (2) and the cover plate (1) are respectively provided with a plate rib (12) at a position close to the air inlet pipe (8), the liquid outlet pipe (9) and the capillary tube (7).

11. An evaporator according to claim 1, characterized in that the outlet pipe (9) is of flat-tube construction adjacent to the end connected to the bottom plate (2).

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