CN113458642A

CN113458642A - Welding method of scroll compressor

Info

Publication number: CN113458642A
Application number: CN202110853096.6A
Authority: CN
Inventors: 辛操; 闫伟国; 李琳; 魏佳君; 赵忠鑫
Original assignee: Panasonic Appliances Compressor Dalian Co Ltd
Current assignee: Panasonic Appliances Compressor Dalian Co Ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2021-10-01

Abstract

The invention provides a welding method of a scroll compressor, which comprises the following steps: the method comprises the following steps of firstly, obtaining a concentric thin-wall shell, and obtaining a first model by utilizing the shell; the first model is a plurality of circular holes I for welding formed in the shell; step two, obtaining a support structure, and obtaining a second model by using the support structure; the second model is provided with a plurality of circular holes II for welding, which correspond to the positions of the circular holes I, on the supporting structure; step three, setting a set position for installing the supporting structure into the shell; and fourthly, after the supporting structure is arranged in the shell, a third model is obtained by utilizing the combined welding connection of the first model and the second model, and the third model is a welding nugget which is formed in the two circular holes and is used for connecting the shell and the supporting structure. The invention has simple structure, low cost, high strength and strong bearing capacity.

Description

Welding method of scroll compressor

Technical Field

The invention relates to the technical field of closed refrigeration compressors, in particular to a welding method of a scroll compressor.

Background

The totally-enclosed scroll compressor can be generally divided into two parts, namely a driving group and a pump group, wherein the driving group mainly comprises a support 16, a driving motor stator 14, a driving motor rotor 13, a crankshaft 11, a sliding bearing 12, a rolling bearing 15 and the like, as shown in fig. 1, the support is divided into a main support and a secondary support, and the crankshaft ensures the coaxiality during high-speed rotation through the support. The main support, the auxiliary support and the shell are required to be fixed in the assembling process of the driving set of the existing totally-enclosed scroll compressor so as to achieve the purpose of assembling the driving set into a fixed whole. And the compressor generates high pressure during operation, and the pressure is finally borne by the support. The fixation between the support and the housing requires a high strength.

The conventional fixing modes between the shell and the support comprise a processing shape fixing method, a stamping shell fixing method and a steel pin implantation welding method, but have the following defects:

1. a machining shape fixing method: the inner diameter of the shell is processed into a step shape, and pressure bearing and limiting are carried out by utilizing the shape, but the shell of the compressor is thicker and needs additional machining. The cost is significantly increased.

2. A stamping shell fixing method: the reserved concave pit is supported, the shell is punched at the corresponding position, the shell generates plastic deformation, and the shell is matched with the reserved concave pit to clamp the support. The method has large requirements on the power and the precision of the stamping shell device. The cost is high.

3. And (3) steel pin implantation welding: because the support is generally made of cast iron, the welding performance of the cast iron is poor, and the welding spot cannot bear high pressure during vortex operation. Therefore, the general operation method when using the welding method is: drilling the support, then pressing in the steel pin in interference fit, and turning the steel pin, so that the support is made of the composite material of which the welding position is steel and the other parts are cast iron. And then fixed with the housing by welding the steel pin. Although this method is strong enough, the cost of steel press pins, steel lathing pins, etc. is high.

Disclosure of Invention

According to the currently common fixing method between the shell and the support, the machining shape fixing method can cause the shell of the compressor to be thicker, and additional machining is needed, so that the cost is obviously increased; the stamping shell fixing method has higher requirements on the power and the precision of stamping shell equipment and higher cost; the steel pin implantation welding method has the technical problem of high cost, such as steel pressing pins, steel turning pins and the like, although the strength is enough, and provides a welding method of a scroll compressor. The invention is mainly used for filling welding wires and forming a columnar welding nugget by reserving round holes in both the shell and the supporting structure; after welding, the welding nugget not only welds the shell and the supporting structure together, and the formed columnar welding nugget like a pin is inserted into the supporting structure, so that the bearing capacity of the support is enhanced.

The technical means adopted by the invention are as follows:

a welding method of a scroll compressor comprises the following steps:

the method comprises the following steps of firstly, obtaining a concentric thin-wall shell, and obtaining a first model by utilizing the shell, wherein the first model is formed by punching or drilling a plurality of circular holes I for welding on the shell;

step two, obtaining a supporting structure with clearance fit, transition fit or interference fit between the outer diameter and the inner diameter of the shell, wherein the supporting structure is a main support or an auxiliary support, and a second model is obtained by utilizing the supporting structure; the second model is provided with a plurality of circular holes II for welding, which correspond to the positions of the circular holes I;

step three, setting a set position for installing the supporting structure into the shell; the set position refers to that the round hole II and the round hole I are coaxially arranged;

and fourthly, after the supporting structure is arranged in the shell, a third model is obtained by utilizing the combined welding connection of the first model and the second model, and the third model is a welding nugget which is formed in the two circular holes and is used for connecting the shell and the supporting structure.

Further, the specific steps of the fourth step are as follows:

s1, after the supporting structure is installed in the shell, a welding machine is started to weld, and a welding wire is aligned to a round hole II of the supporting structure through the center of the round hole I to be welded and connected between the supporting structure and the shell; the combination of the round hole I and the round hole II forms a reserved through hole;

s2, starting welding, filling the reserved through holes of the supporting structure and the shell by melting the welding wires, forming fusion depth between the reserved through holes and the supporting structure and the reserved through holes, and forming a columnar welding nugget in the reserved through holes; the welding nugget is used for connecting the shell and the supporting structure, plays a role of a pin, is used for fixing the supporting structure and the shell, and increases the bearing strength of the supporting structure.

Further, the specific steps of step S2 are as follows:

and (3) welding and melting the welding wire and the supporting structure, wherein the supporting structure is provided with a round hole II, the welding wire is rapidly melted and fills the round hole II, the welding gun moves outwards along the axis of the round hole II along with the welding, the shell starts to be melted and is filled with the round hole I of the shell, and finally the supporting structure is welded and connected with the shell, and the welding wire is filled into the reserved through hole to form a columnar welding nugget.

Furthermore, in the second step, the aperture of the round hole I is preferably similar to that of the round hole II; the aperture difference between the two is less than 2 mm.

Furthermore, the round hole II and the round hole I are coaxially arranged, namely the round hole I and the round hole II can be coincided in a corresponding mode of angular and radial positions.

Compared with the prior art, the invention has the following advantages:

1. the welding method of the scroll compressor provided by the invention has the advantages of simple structure and low cost. With turning to the internal diameter of casing, carry out spacing mode with supporting the cooperation through the stair structure of internal diameter and compare, casing thickness is showing the attenuation, need not carry out lathe work to the internal diameter of casing. Compared with a fixing method for generating plastic deformation by stamping a shell, the method does not need equipment investment with complex and high precision. Compared with the steel pin pressed in the support, the process is simple and the cost is lower.

2. The welding method of the scroll compressor provided by the invention has the advantages of high strength and strong pressure bearing capacity. Before the shell is welded with the support, round holes are reserved on the shell and the support and are used for filling welding wires and forming a columnar welding nugget; after welding, the welding nugget not only welds the shell and the support together, but also forms a columnar welding nugget like a pin to be inserted in the support, so that the bearing capacity of the support is enhanced.

In conclusion, the technical scheme of the invention can solve the problems that the shell of the compressor is thicker and needs additional machining in the conventional fixing mode between the shell and the support by using a machining shape fixing method, and the cost is obviously increased; the stamping shell fixing method has higher requirements on the power and the precision of stamping shell equipment and higher cost; the steel pin implant welding method has a problem of high cost such as steel pressing and steel pin turning, although the strength is sufficient.

For the reasons, the invention can be widely popularized in the fields of compressors and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a structural form commonly used for a driving assembly portion in a hermetically sealed scroll compressor, and the positional relationship of various components in the compressor is illustrated by a longitudinal sectional view.

Fig. 2 is a sectional view taken at a-a of fig. 1, and illustrates a positional relationship of parts at the time of welding to be expressed by the present invention by way of the sectional view.

Fig. 3 shows the position relationship of the support of the present invention before welding with the housing.

Fig. 4 shows the position relationship of the support and the shell after welding.

In the figure: 1. a housing; 2. a support structure; 3. reserving a through hole; 4. a welding gun; 5. welding a nugget; 11. a crankshaft; 12. a sliding bearing; 13. a motor rotor; 14. a motor stator; 15. a rolling bearing; 16. and (4) supporting.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in the figure, the invention provides a welding method of a scroll compressor, which relates to the scroll compressor and is a welding method for fixing a main support and an auxiliary support of the compressor on an outer shell of the compressor, and the welding method comprises the following steps:

the method comprises the following steps of firstly, obtaining a concentric thin-wall shell 1, and obtaining a first model by utilizing the shell 1, wherein the first model is formed by punching or drilling a plurality of circular holes I for welding on the shell 1;

step two, obtaining a supporting structure 2 with the outer diameter in clearance fit, transition fit or interference fit with the inner diameter of the shell 1, wherein the supporting structure 2 is a main support or an auxiliary support, and a second model is obtained by using the supporting structure 2; the second model is a plurality of circular holes II for welding, which are formed in the supporting structure 2 and correspond to the positions of the circular holes I;

step three, setting a set position for installing the supporting structure 2 into the shell 1; the set position refers to that the round hole II and the round hole I are coaxially arranged;

and step four, after the supporting structure 2 is arranged in the shell 1, a third model is obtained by utilizing the combined welding connection of the first model and the second model, wherein the third model is a welding nugget 5 which is formed in the two round holes and is used for connecting the shell 1 and the supporting structure 2.

Preferably, the specific steps of the fourth step are as follows:

s1, after the supporting structure 2 is installed in the shell 1, a welding machine is started to weld, welding wires pass through the center of the round hole I and aim at the round hole II of the supporting structure 2, and the supporting structure 2 is welded with the shell 1; the combination of the round hole I and the round hole II forms a reserved through hole 3;

s2, starting welding, filling the reserved through hole 3 of the support structure 2 and the shell 1 by melting the welding wire, forming a penetration between the welding wire and the reserved through hole 3, and forming a columnar welding nugget 5 in the reserved through hole 3; the welding nugget 5 is used for connecting the shell 1 and the supporting structure 2, plays a role of a pin, is used for fixing the supporting structure 2 and the shell 1, and increases the bearing strength of the supporting structure 2.

Preferably, the specific steps of step S2 are as follows:

welding begins, welds melting welding wire and bearing structure 2, because bearing structure 2 has seted up round hole II, the welding wire melts rapidly and fills round hole II, and along with the welded going on, welder 4 moves outward along the axis of round hole II, begins to melt casing 1 to fill the round hole I of casing 1, at last with bearing structure 2 and casing 1 welded connection, and fill the welding wire and form column welding nugget 5 in reserving through-hole 3.

Preferably, in the second step, the aperture of the round hole I is preferably similar to that of the round hole II; the aperture difference between the two is less than 2 mm.

Preferably, the round hole II and the round hole I are coaxially arranged, namely the round hole I and the round hole II can be coincided in corresponding angular and radial positions.

Example 1

As shown in fig. 1 to 4, a welding method of a scroll compressor includes the steps of:

1. obtaining a concentric thin-wall shell 1, and reserving a circular hole I for welding on the shell 1. The round hole I is generally obtained by stamping or drilling. In this embodiment, four circular holes i are formed in the wall surface of the housing 1 and are distributed at equal intervals in the circumferential direction, and the axes of the four circular holes i are located on the same horizontal plane. In practice, not only this is applicable, but also two, three, four, six or more circular holes i may be provided. The concentric structure means that the shell 1 and the supporting structure 2 are arranged concentrically, the thin wall means that the shell 1 is processed into a structure with a certain thickness and a cavity inside, and the supporting structure is arranged in the cavity.

2. And obtaining a supporting structure with the outer diameter having clearance fit, transition fit or interference fit with the inner diameter of the thin-wall shell 1, wherein the supporting structure 2 is a main support or an auxiliary support. Four circular holes II for welding corresponding to the positions of the circular holes I reserved on the shell 1 are reserved on the supporting structure 2. The apertures of the reserved round holes on the shell 1 and the supporting structure 2 are preferably close to each other. The aperture difference between the two is less than 2 mm.

3. A set position is provided for the support structure 2 to be fitted into the housing 1. This settlement position means place back in casing 1 with bearing structure 2, guarantees through prior art that casing 1's round hole I is coaxial with bearing structure 2's round hole II.

4. After the supporting structure 2 is installed in the shell 1, the welding machine is started to weld, the welding wire passes through the center of the reserved round hole I of the shell 1 to weld the supporting structure 2 and the shell 1, and the combination of the round hole I and the round hole II forms a reserved through hole 3. Welding starts, and the welding wire and the supporting structure 2 are welded, because the reservation round hole II of the supporting structure 2, the welding wire is rapidly melted and fills the round hole II, along with the welding, the welding gun 4 moves outwards along the axis of the round hole II, melts the shell 1, fills the reservation round hole I of the shell 1, finally welds the supporting structure 2 and the shell 1, and fills the welding wire into the reservation through hole 3 to form the columnar welding nugget 5.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited thereto. The components described herein are merely generic names, such as "support" herein refers to a structural frame, also referred to as a bracket, a frame, etc., for fixedly holding the crankshaft in rotation. All the welding and fixing of the internal parts and the outer shell related to the field of the scroll compressor by adopting similar processes are covered in the protection scope of the invention. The circular holes are described as approximate names, generally circular, but oval, square, polygonal holes with the same utility are all within the scope of the invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding method of a scroll compressor is characterized by comprising the following steps:

the method comprises the following steps of firstly, obtaining a concentric thin-wall shell (1), and obtaining a first model by utilizing the shell (1), wherein the first model is formed by punching or drilling a plurality of circular holes I for welding on the shell (1);

step two, obtaining a supporting structure (2) with the outer diameter in clearance fit, transition fit or interference fit with the inner diameter of the shell (1), wherein the supporting structure (2) is a main support or a secondary support, and obtaining a second model by using the supporting structure (2); the second model is a plurality of circular holes II for welding, which are formed in the supporting structure (2) and correspond to the positions of the circular holes I;

step three, setting a set position for installing the supporting structure (2) into the shell (1); the set position refers to that the round hole II and the round hole I are coaxially arranged;

and fourthly, after the supporting structure (2) is arranged in the shell (1), a third model is obtained by utilizing the combined welding connection of the first model and the second model, and the third model is a welding nugget (5) which is formed in the two round holes and is used for connecting the shell (1) and the supporting structure (2).

2. The welding method of the scroll compressor according to claim 1, wherein the specific steps of the fourth step are as follows:

s1, after the supporting structure (2) is installed in the shell (1), a welding machine is started to weld, welding wires pass through the center of the round hole I and aim at the round hole II of the supporting structure (2), and the supporting structure (2) and the shell (1) are welded; the combination of the round hole I and the round hole II forms a reserved through hole (3);

s2, starting welding, filling the reserved through hole (3) of the support structure (2) and the shell (1) by melting the welding wire, forming a penetration between the welding wire and the reserved through hole (3), and forming a columnar welding nugget (5) in the reserved through hole (3); the welding nugget (5) is used for connecting the shell (1) and the supporting structure (2), plays a role of a pin, is used for fixing the supporting structure (2) and the shell (1), and increases the bearing strength of the supporting structure (2).

3. The method for welding a scroll compressor according to claim 2, wherein the step S2 is as follows:

the welding begins, welding melts welding wire and bearing structure (2), because bearing structure (2) have seted up round hole II, the welding wire melts rapidly and fills round hole II, along with the welded going on, welder (4) move outward along the axis of round hole II, begin to melt casing (1), and fill round hole I of casing (1), at last with bearing structure (2) and casing (1) welded connection, and fill the welding wire and form column welding nugget (5) in reserving through-hole (3).

4. A method for welding a scroll compressor according to claim 1, 2 or 3, wherein in the second step, the difference in the diameter between the circular hole i and the circular hole ii is less than 2 mm.