阅读说明：本技术 制冷机的不锈钢壳体及其加工方法 (Stainless steel shell of refrigerator and machining method thereof ) 是由 吕志玲 李传炉 于 2020-12-22 设计创作，主要内容包括：一种制冷机的不锈钢壳体及其加工方法,其特征在于：该壳体包括中间壳体(1),位于中间壳体(1)一端用于封闭其端头的冷端盖(2),位于中间壳体(1)另一端的冲座(3)；且所述的冲座(3)、中间壳体(1)和冷端盖(2)为分体式设置,并经焊接构成完整的壳体。本申请具有分体式的结构,从而有效的解决了传统多道拉伸工艺的不足,降低了成本,提高了生产效率、简化了制备工序的优点。(A stainless steel shell of a refrigerator and a processing method thereof are characterized in that: the shell comprises a middle shell (1), a cold end cover (2) which is positioned at one end of the middle shell (1) and used for sealing the end of the middle shell, and a punch seat (3) which is positioned at the other end of the middle shell (1); and the punch seat (3), the middle shell (1) and the cold end cover (2) are arranged in a split mode and form a complete shell through welding. The multi-channel stretching device has a split structure, so that the defects of the traditional multi-channel stretching process are effectively overcome, the cost is reduced, the production efficiency is improved, and the preparation process is simplified.)

1. A stainless steel casing of refrigerator which characterized in that: the shell comprises a middle shell (1), a cold end cover (2) which is positioned at one end of the middle shell (1) and used for sealing the end of the middle shell, and a punch seat (3) which is positioned at the other end of the middle shell (1); and the punch seat (3), the middle shell (1) and the cold end cover (2) are arranged in a split mode and form a complete shell through welding.

2. The stainless steel housing of a refrigerator according to claim 1, wherein: the top end of the cold end cover (2) is of an axially outward protruding structure.

3. The stainless steel housing of a refrigerator according to claim 1, wherein: the punching seat (3) comprises a welding part (3.1) welded with the middle shell (1) and a base part (3.2) connected with the cylinder; the inner diameter of the welding part (3.1) is equal to the outer diameter of the middle shell (1), and the inner wall of the welding part is provided with an annular step groove (3.3) matched with the middle shell (1); the base part (3.2) is of a conical structure gradually enlarged from the end connected with the welding part (3.1) to the bottom end, and a mounting hole (3.4) is formed in the bottom end face of the base part (3.2).

4. The stainless steel housing of a refrigerator according to claim 3, wherein: the bottom of base portion (3.2) be provided with radial inward annular groove (3.5), annular groove (3.5) be used for with lower casing joint.

5. The stainless steel housing of a refrigerator according to claim 4, wherein: the bottom end of the side wall where the annular groove (3.5) is located protrudes out of the bottom end surface.

6. The stainless steel housing of a refrigerator according to claim 1, wherein: the wall thickness of the punch seat (3) is larger than that of the middle shell (1).

7. The stainless steel housing of a refrigerator according to claim 1, wherein: the bottom end face of the punching seat (3) is an annular plane, and the mounting hole (3.4) is located on the annular plane and extends upwards along the axial direction.

8. The stainless steel housing of a refrigerator according to claim 1, wherein: the middle shell (1) is of a cylindrical structure, and one end, located on the cold end cover (2), of the middle shell (1) is wrapped on the cold end cover, and one end, located on the punching seat (3), of the middle shell is sleeved in the punching seat (3).

9. A method of processing a stainless steel casing for a refrigerator according to any one of claims 1 to 8, characterized by: the processing steps comprise:

(1) the three-part assembly of the housing is first prepared according to the structure of the housing: the stamping seat, the middle shell and the cold end cover;

(2) then the three parts of components are firstly assembled and combined according to the following sequence: the punching seat, the middle shell and the cold end cover are assembled and matched from bottom to top to form a shell structure initial blank;

(3) and the shell structure initial blank after the assembly and the matching is distributed at the joint of the punch seat and the middle shell for laser welding, and the joint of the middle shell and the cold end cover for laser welding to form a complete shell structure.

10. The machining method for a stainless steel casing of a refrigerator according to claim 10, characterized in that:

the middle shell is processed into a straight tube shape by adopting a metal material, and a circle of annular step groove body is milled on the inner wall of the middle shell at the end of the cold end cover for sleeving the cold end cover;

the cold end cover is manufactured by stamping metal plates to obtain a structure with an axially outward bulge, and an extension section for being sleeved with the middle shell extends from the lower end of the bulge;

the punching seat adopts a structure that a metal material is heated, then is placed in a die and is subjected to one-time reciprocating motion through a press machine to be punched out;

the assembling fit is tight fit.

Technical Field

The application relates to the technical field of Stirling refrigerators, in particular to a stainless steel shell of a refrigerator and a processing method thereof.

Background

A stirling cooler is a mechanical cooler driven by electricity. The working principle is that the gas does work by adiabatic expansion, namely, the gas works according to the reverse Stirling cycle to refrigerate. The Stirling refrigerator has the advantages of compact structure, wide working temperature range, quick start, high efficiency, simple and convenient operation and the like. The temperature of the two-space refrigerator can reach 80K, the refrigerating temperature of the three-space refrigerator can reach 10.5-20K, the temperature of the four-space refrigerator can reach 7.8K, and the Stirling refrigerator with the coldhead with the lowest temperature reaching 6K to 3.1K is also developed successfully.

The structure of the Stirling refrigerator generally comprises an upper shell, a lower shell, and structural components (such as an air cylinder, a heat regenerator and the like) arranged in the shell, such as an air cylinder, a plate spring, a refrigeration base body and the like, wherein the general structure of the shell positioned outside the refrigeration base body comprises a columnar shell, one end of the columnar shell is provided with a cold end cover, and the other end of the columnar shell is provided with a seat body (or a flange seat and a punching seat) for connecting the internal structural components such as the air cylinder and the like; the structure of the traditional shell is an integrated structure, because the shell needs a certain depth to accommodate components such as a refrigeration substrate and the like, the structure can be formed by conventionally adopting a whole metal plate through multiple stretching (lifting) deformation and hardening treatment, although the surface of the integrated structure is smooth and the appearance is clean, the whole preparation process is very complicated, the use requirement can be met only by at least 9 times of repeated stretching and hardening, the manufacturing cost is increased, and the production efficiency is reduced; the high requirement of the process on the metal stretching rate easily causes uneven thickness of each part in the metal stretching process, and influences use; it also tends to cause defects and disadvantages such as large dimensional deviation, high scrap rate, and the like.

Disclosure of Invention

The utility model provides a split type structure to the aforesaid of prior art is not enough, provides to effectual not enough of having solved traditional multichannel stretching technology, the cost is reduced has improved production efficiency, has simplified the stainless steel casing of the refrigerator of preparation process.

In order to solve the technical problem, the technical scheme adopted by the application is as follows: a stainless steel shell of a refrigerator comprises a middle shell, a cold end cover and a punch seat, wherein the cold end cover is positioned at one end of the middle shell and used for sealing the end of the middle shell; and the punching seat, the middle shell and the cold end cover are arranged in a split mode and form a complete shell through welding.

By adopting the structure, the punch seat, the middle shell and the cold end cover only need to be processed separately, and then the punch seat, the middle shell and the cold end cover are welded to form a complete shell; because the three parts are processed independently, the whole metal plate does not need to be stretched, hardened and other processes for many times, thereby reducing the manufacturing processes, improving the production efficiency and reducing the manufacturing cost; the middle shell does not need to be stretched for multiple times, but only needs to be formed by winding and welding metal plates or by simply stretching the plates, or can be formed by directly stamping, and the cold end cover and the stamping seat do not need a complex stamping process, do not have deep axial depth, and are more convenient and faster to process.

Preferably, the top end of the cold end cover is of an axially outward convex structure; adopt this structure to provide more spaces for inside refrigeration, promote refrigeration effect, can also improve the area of contact of the refrigerant in the casing and cold end cover in addition, promote refrigeration effect.

Preferably, the punch seat comprises a welding part welded with the middle shell and a base part used for being connected with the cylinder; the inner diameter of the welding part is equal to the outer diameter of the middle shell, and the inner wall of the welding part is provided with an annular step groove matched with the middle shell; the base part is of a conical structure gradually enlarged from the connecting end with the welding part to the bottom end, and a mounting hole is formed in the bottom end face of the base part; by adopting the structure, the contact area between the middle shell and the punch seat can be increased, the welding firmness of the middle shell and the punch seat can be improved, the middle shell can be inserted into the annular step groove sleeved on the inner wall of the welding part in advance, and then laser welding is carried out, so that the problem of poor air tightness of the welding part caused by deviation and dislocation can be avoided; in addition, base portion has set up the convenient and lower casing of conical structure and has combined, can also realize simultaneously with the fixed mounting of cylinder etc..

Preferably, the bottom end of the base part is provided with a radially inward annular groove, and the annular groove is used for being clamped with the lower shell; adopt above-mentioned structure to make things convenient for the casing and the casing cooperation installation down of this application.

Preferably, the bottom end of the side wall where the annular groove is located protrudes out of the bottom end surface; namely, the bottom end surface of the annular groove is protruded out of the bottom end surface in the direction of the lower shell in the axial direction; such structural design can realize the steady installation of inside cylinder and bottom face, and the bottom face of convex annular groove protects the cylinder simultaneously, also convenient and lower shell installation.

Preferably, the wall thickness of the punch seat is greater than that of the middle shell; adopt this structure on the one hand can improve the middle casing and dash the welding firmness between the seat, can also effectual use strength who guarantees the casing and the installation stable effect of cylinder simultaneously.

Preferably, the bottom end surface of the punch seat is an annular plane, and the mounting hole is located on the annular plane and extends upwards along the axial direction; by adopting the structure, the installation between the air cylinder and the punching seat is convenient, and the running stability of the air cylinder is ensured.

Preferably, the middle shell is of a cylindrical structure, one end of the middle shell, which is positioned at the cold end cover, is wrapped by the cold end cover, and one end of the middle shell, which is positioned at the punching seat, is sleeved in the punching seat; by adopting the structure, the welding effect is improved through the arrangement that the two ends of the middle shell are alternately positioned at the outer side and the inner side of the adjacent parts, and the use requirement of the refrigerator can be met.

The welding can be laser welding or other welding modes, and welding technologies which can not crack and leak and can meet the use pressure requirement of the Stirling refrigerator shell are all suitable for the application as long as the three parts can be welded into the finished shell.

The application also provides a processing method of the stainless steel shell of the refrigerator, which comprises the following specific processing steps:

(1) the three-part assembly of the housing is first prepared according to the structure of the housing: the stamping seat, the middle shell and the cold end cover;

(2) then the three parts of components are firstly assembled and combined according to the following sequence: the punching seat, the middle shell and the cold end cover are assembled and matched from bottom to top to form a shell structure initial blank;

(3) and the shell structure initial blank after the assembly and the matching is distributed at the joint of the punch seat and the middle shell for laser welding, and the joint of the middle shell and the cold end cover for laser welding to form a complete shell structure.

Preferably, the middle shell is made of metal materials and is in a straight tubular shape, and a circle of annular step groove body is milled on the inner wall of the end, where the cold end cover is located, of the middle shell so as to be sleeved with the cold end cover;

preferably, this application cold junction lid adopt sheet metal to carry out the punching press preparation and obtain having the outside bellied structure of axial, and the lower extreme of bellied structure extends and has the extension section that is used for registeing with middle casing.

Preferably, the punch holder adopts a structure that a metal material is heated, then placed in a die and subjected to one-time reciprocating motion through a press machine to be red punched to form the punch holder.

Preferably, the assembly of the punch holder, the middle shell and the cold end cover is a tight fit.

Drawings

Fig. 1 is a schematic structural diagram of a stainless steel casing of a refrigerator of a split structure according to the present application.

Fig. 2 is an assembly diagram structure schematic diagram of a stainless steel shell of the split-type refrigerator of the present application.

Fig. 3 is a schematic view of a first angular structure of the die holder according to the present application.

Fig. 4 is a schematic view of a second angular structure of the punch holder of the present application.

As shown in the attached drawings: 1. the structure of the cold-hot water pipe comprises a middle shell, 2 cold end covers, 2.1 bulges, 3 punch seats, 3.1 welding parts, 3.2 base parts, 3.3 annular step grooves, 3.4 mounting holes, 3.5 annular grooves and 3.6 bottom end faces.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only preferred embodiments, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present invention;

further, it is to be noted that: when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by way of the intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1-2, which is a schematic structural diagram of a stainless steel shell of a refrigerator according to the present application, the shell specifically includes a middle shell 1, one end of the middle shell 1 is connected with a cold end cover 2 for sealing the end thereof, and the other end of the middle shell is connected with a punch holder 3; the punching seat 3, the middle shell 1 and the cold end cover 2 are arranged in a split mode and are welded to form a complete shell (namely the punching seat 3, the middle shell 1 and the cold end cover 2 are sequentially connected and then the joints are welded to form a complete shell structure, namely the shell is formed by sequentially welding the punching seat 3, the middle shell 1 and the cold end cover 2 in a laser mode, the welding can be performed by laser welding, the convenience and the rapidness are improved, the welding effect is good, and the sealing performance of the welding joints is guaranteed), namely the three components are welded to form the finished shell structure.

By adopting the structure, the punch seat, the middle shell and the cold end cover only need to be processed separately, and then the punch seat, the middle shell and the cold end cover are welded to form a complete shell; because the three parts are processed independently, the whole metal plate does not need to be stretched, hardened and other processes for many times, thereby reducing the manufacturing processes, improving the production efficiency and reducing the manufacturing cost; the middle shell does not need to be stretched for many times, is formed by winding and welding metal plates or by simply stretching the plates, or can be directly formed by stamping, the cold end cover and the stamping seat do not need a complex stamping process, the deep axial depth is avoided, and the processing is more convenient and quicker. The punch seat, the middle shell and the cold end cover can be well sealed through laser welding, cracking is avoided under the bearing pressure of 1.5MPa, and the use requirement can be completely met on the premise of simplifying the working procedures.

As shown in fig. 1-2, the top end of the cold end cover 2 is an axially outward convex structure 2.1 (which may be an arc-shaped convex structure), that is, the direction of the convex structure extends toward the outer side surface of the cold end cover, that is, the direction of the end far away from the middle shell; the structure is adopted to provide more space for internal refrigeration, improve the refrigeration effect and facilitate the flow of cold medium; in addition, the contact area between the refrigerant body in the shell and the cold end cover can be increased, and the refrigeration effect is improved.

As shown in fig. 3-4, the die holder 3 of the present application includes a welding portion 3.1 welded to the middle housing, and a base portion 3.2 for connecting to a cylinder (i.e., a cylinder structure inside the stirling coolant, which may also be connected to the die holder through a frame, and the cylinder is fixed to the frame); the inner diameter of the welding part 3.1 is equal to the outer diameter of the middle shell 1, and the inner wall of the welding part 3.1 is provided with an annular step groove 3.3 matched with the middle shell; the base part 3.2 is a conical structure gradually enlarged from the connecting end with the welding part to the bottom end (namely, the base part is a conical structure gradually enlarged from top to bottom), and the bottom end surface of the base part is provided with a mounting hole 3.4; by adopting the structure, the contact area between the middle shell and the punch seat can be increased, and the welding firmness of the middle shell and the punch seat can be improved; in addition, the conical structure is arranged to be convenient to combine with the lower shell, and meanwhile, the conical structure can be fixedly installed with an air cylinder and the like; above-mentioned middle casing can adopt the mode of tight fit with the insertion registrate of dashing the seat, can improve the position degree of accuracy between the two like this, for follow-up welding provides good basis, the tight fit can adopt earlier to preheat the registrate spare, carries out the technological effect that shrink realized the tight fit after hot registrate, the cooling.

As shown in fig. 4, a bottom end (on an outer side surface) of the base portion 3.2 is provided with a radially inward annular groove 3.5 (i.e., formed by notching a circumference of a side wall of the base portion near the lower end surface), and the annular groove is used for being clamped with a lower shell (the lower shell is a part of a shell which is combined with the shell of the present application to form an outer shell of the complete stirling cooler); adopt above-mentioned structure to make things convenient for the casing and the casing cooperation installation down of this application.

The wall thickness of the punch holder 3 is larger than that of the middle shell 1; because the punching seat not only needs to form a part of the shell, but also needs to be installed and combined with parts such as an internal cylinder as an installation seat, the welding firmness between the middle shell and the punching seat can be improved by adopting the structure, and meanwhile, the use strength of the shell and the installation effect of the cylinder can be effectively ensured.

As shown in fig. 4, the bottom end surface 3.6 of the punch holder 3 is an annular plane, and the mounting hole 3.4 is located on the annular plane and extends upward along the axial direction; by adopting the structure, the installation between the air cylinder and the punching seat is convenient, the connection firmness of the air cylinder is improved, and the running stability of the air cylinder is ensured.

As shown in fig. 4, the bottom end of the sidewall where the annular groove 3.5 is located protrudes from the bottom end surface 3.6; namely, the bottom end surface of the side wall where the annular groove 3.5 is positioned extends axially towards the lower shell to be protruded out of the bottom end surface 3.6; such structural design can realize the steady installation of inside cylinder and bottom face, and the convex bottom face of lateral wall at annular groove 3.5 place protects the cylinder simultaneously, also convenient and lower shell mounting.

As shown in fig. 1-2, the middle housing 1 of the present application is a cylindrical structure, and one end of the middle housing located at the cold end cover is wrapped by the cold end cover (the end part of the middle housing is wrapped by the cold end cover, i.e., the middle housing at the end is sleeved on the outer side wall of the cold end cover), and one end located at the punch base 3 is sleeved in the punch base (i.e., the end of the punch base is wrapped on the outer wall of the end of the middle housing); by adopting the structure, the welding effect is improved through the arrangement that the two ends of the middle shell are alternately positioned at the outer side and the inner side of the adjacent parts, and the use requirement of the refrigerator can be met.

The application also provides a processing method of the stainless steel shell of the refrigerator, which comprises the following specific processing steps:

(1) firstly, processing a straight tubular middle shell by adopting a metal material, and milling a circle of annular step groove body on the inner wall of the end of the middle shell, where the cold end cover is located, so as to be sleeved with the cold end cover;

(2) carrying out one-step stamping on a metal plate to obtain a cold end cover with an axially outward convex structure, wherein an extension section for being sleeved with the middle shell extends from the lower end of the convex structure;

(3) heating a metal material, then placing the metal material in a die, and carrying out one-time reciprocating motion through a press machine to obtain a punching seat structure;

(4) and (3) inserting and sleeving the middle shell in an annular step groove position arranged at the welding part of the punch seat, inserting and sleeving the cold end cover on the inner side wall of the middle shell, and then performing laser welding at the joint of the two inserting and sleeving positions to obtain a complete shell structure.

By adopting the processing technology, the shell can be decomposed into three parts, the three parts can be obtained by simple processing in a distributed manner, the 9-step stretching and hardening treatment in the prior art is not needed, then the finished shell structure can be obtained by laser welding after the sleeve-connection and the splicing, the technology is simple, the processing difficulty is reduced, the processing cost is greatly reduced, and the pressure-resistant degree of the shell obtained by laser welding completely meets the use requirement.

After the processing is finished, the shell simulates the use environment to measure the pressure resistance, and the result shows that the pressure resistance inside the shell formed by laser welding in a three-part split mode can reach 15MPa without cracking, and the pressure resistance requirement of the shell of a normal Stirling refrigerator can meet the requirement only at 1.5 MPa.

The three-part assembly can be prepared from stainless steel materials, the stainless steel materials are subjected to laser welding, the welding process is simple, the operation is convenient, and the connection firmness is more reliable.