CN108425848B

CN108425848B - Rotary compressor

Info

Publication number: CN108425848B
Application number: CN201810542103.9A
Authority: CN
Inventors: 小津政雄; 王玲
Original assignee: Guangdong Meizhi Compressor Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd
Priority date: 2018-05-30
Filing date: 2018-05-30
Publication date: 2023-10-24
Anticipated expiration: 2038-05-30
Also published as: CN108425848A

Abstract

The invention discloses a rotary compressor, which is composed of a cylinder shell and an end plate shell connected with the side surface of the cylinder shell, wherein an electric motor, a rotary compression structure part driven by the electric motor and lubricating oil are contained in a closed shell, the compression structure part comprises: the cylinder casing is welded to the compression structure portion and the end plate casing is welded to the muffler. The compression structure part of the compressor has better fixing effect.

Description

Rotary compressor

Technical Field

The present invention relates to an improvement in vibration resistance of a rotary compressor in an air conditioner or a refrigerator for vehicles such as an electric vehicle, a refrigerator vehicle, a camping vehicle, or the like, which vibrates severely, and is a new technology from the conventional two-dimensional welding to the current three-dimensional welding.

Background

It is expected that the compressor to be mounted in an in-vehicle air conditioner and an in-vehicle refrigerating apparatus will grow rapidly in the future. The rotary compressors mounted on these machines include horizontal compressors in which the crankshaft is in a horizontal direction and vertical compressors in which the crankshaft is in a vertical direction. The rotary compressor mounted in a narrow space is required to be compact and lightweight, but is required to be strong against frequent strong vibration.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the invention provides the rotary compressor with better fixing effect of the compression structure part.

According to an embodiment of the present invention, a rotary compressor is provided, in which an electric motor, a rotary compression structure driven by the electric motor, and lubricating oil are housed in a hermetic case composed of a cylindrical case, an end plate case connected to a side surface of the cylindrical case, and the like, wherein the compression structure includes: the cylinder casing is welded to the compression structure portion and the end plate casing is welded to the muffler.

In some embodiments, a shaft center hole provided in the crankshaft opens to the muffler.

In some embodiments, a three-core terminal fixed to the cylindrical housing is provided between the electric motor and the compression structure.

According to an embodiment of the present invention, a rotary compressor includes: a hermetic housing, the hermetic housing comprising: the device comprises a cylinder shell and end plate shells, wherein two ends of the cylinder shell are open, and the end plate shells are respectively connected with two ends of the cylinder shell; the electric motor is arranged in the closed shell; a compression structure portion disposed within the hermetic case and driven by the electric motor; at least one muffler disposed on the compression structure; the electric motor comprises a compression structure part, an end plate shell, a cylinder shell, a muffler, a first welding spot and a second welding spot, wherein the plurality of first welding spots are arranged between the outer peripheral surface of the compression structure part and the cylinder shell, one muffler is arranged on one side, far away from the electric motor, of the compression structure part to form a first muffler, one end plate shell is adjacent to the first muffler to form a first end plate shell, and the second welding spot is arranged between the first end plate shell and the first muffler.

In some embodiments, a plurality of the first pads are in the same plane.

In some embodiments, the plurality of first weld points are equally spaced along the circumference of the cylindrical shell.

In some embodiments, the first solder joints are three.

In some embodiments, the center of the first end plate housing is bonded to the center of the first muffler and welding is performed at the bond therebetween to form the second weld.

In some embodiments, the first welding spots are three and are equally spaced along the circumference of the cylinder shell, one of the second welding spots and the three first welding spots are distributed in a cone shape, wherein the vertex of the cone shape is the second welding spot, the three first welding spots are positioned on the base circle of the cone shape, and the distances from the second welding spot to the three first welding spots are equal.

In some embodiments, the compression structure comprises: the cylinder is characterized in that a first welding point is arranged between the outer peripheral surface of the cylinder and the cylinder shell, the first bearing is close to the first end plate shell, the second bearing is close to the electric motor, the first silencer is arranged on the first bearing, the outer peripheral surface of a flange part, attached to the cylinder, of the second bearing is spaced from the inner peripheral surface of the cylinder shell in the radial direction of the cylinder shell, a three-core terminal connected with the electric motor is fixedly arranged on the cylinder shell in a penetrating mode, and the three-core terminal at least partially corresponds to the second bearing in the axial direction of the cylinder shell.

In some embodiments, the compression structure comprises: the cylinder comprises a plurality of cylinders, a first bearing and a second bearing, wherein the first bearing is close to the first end plate shell, the second bearing is close to the electric motor, and a first welding point is arranged between the outer peripheral surface of a flange part, attached to the cylinder, of the second bearing and the cylinder shell.

The invention has the technical effects that:

1) The fixing reliability of the compressor structure part can be improved by several times by only adding 1 point of welding.

2) The compressor can be kept compact.

3) Easy and low cost to manufacture.

Drawings

Fig. 1 to 3 are schematic structural views of a compressor according to three embodiments of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

Example 1:

the hermetic casing 2 of the horizontal rotary compressor 101 shown in fig. 1 is composed of an end plate B casing 2B and an end plate C casing 2C welded to both ends of a cylindrical casing 2a at the entire periphery, and a three-core terminal 25 is provided on the upper central portion of the cylindrical casing 2 a.

The electric motor 5 and the compression structure 10 are fixed to the inner periphery of the cylinder housing 2a, and lubricating oil is stored in the oil reservoir 28. The electric motor 5 is composed of a stator 6 and a rotor core 8 fixed on a crankshaft 16; the outer periphery of the stator 6 is heat-fitted to the inner periphery of the cylindrical housing 2 a. The motor winding 7 on the stator 6 is connected to a motor lead wire 7c, and the leading end is connected to the three-core terminal 25 via a binder 26.

The compression structure 10 is composed of: a cylinder 21 having a compression chamber 21a, a first bearing 18 and a second bearing 22 closing both ends of the compression chamber 21a, a muffler 18a fixed to the first bearing 18, a crankshaft 16 slidably fitted to the 2 bearings, a rolling piston 23 revolved in the compression chamber 21a by the crankshaft 16, a slide sheet (reference numeral 19 in fig. 3) reciprocally fitted to the rolling piston 23, and the like. These constituent members are joined together by 10 screws 24 including the muffler 18a from both sides of the above-mentioned 2 bearings, so that the assembly of the compression structure 10 can be completed.

Next, an assembly process of fixing the compression structure 10 to the inner periphery of the cylindrical housing 2a to which the electric motor 5 is fixed will be described. The compression structure 10 fixed to the aligning jig is inserted into the open end of the cylindrical housing 2a, and arc spot welding 15 is performed at 3 places from the outer periphery of the cylindrical housing 2a to the outer periphery facing the cylinder 21 while maintaining the aligning accuracy. The welding hole 15a bored in the cylindrical housing 2a is a hole for securing the arc welding in place. In addition, the method comprises the following steps. The arc welding 15 at 3 places is 120 degrees apart.

Next, the end plate C housing 2C is welded all around while being pressed against the left end of the cylindrical housing 2 a. At this time, the inner side of the end plate C housing 2C was confirmed to be in contact with the outer periphery of the muffler 18a by the welding hole 15a in the center of the end plate C housing 2C.

After the end of the welding of the end plate C housing 2C to the entire circumference of the cylindrical housing 2a, the muffler welding 20 of the end plate C housing 2C to the muffler 18a is performed. After that, if the outer periphery of the end plate B housing 2B is welded to the cylindrical housing 2a, the hermetic housing 2 housing the electric motor 5 and the compression structure portion 10 is completed.

As a result, the compression structure 10 is fixed to the hermetic shell 2 by welding at 3 points on the inner periphery of the cylindrical shell 2a and at 1 point on the end plate C shell 2C. As a result, the compression structure 10 and the hermetic shell 2 are joined in such a manner that a conical three-dimensional weld is formed from the plane connecting 3 points and the 1 point of the vertex. Therefore, it was found that the welding strength of the compression structure 10 for fixing the rotor core 8 was improved several times or more as compared with the conventional two-dimensional welding, which was only the cylinder outer circumference 3-point welding.

The following description is given: the flow direction of the gas (refrigerant) passing through the horizontal rotary compressor 101 after completion of fig. 1. The low-pressure gas sucked from the suction pipe 3 of the following cylinder 21 flows into the compression chamber 21a from the cylinder suction hole 21b to form a high-pressure gas, which is discharged from the exhaust hole 35 provided in the first bearing 18 to the muffler 18a.

The exhaust gas contains: including about 1% of low-pressure gas flowing from the cylinder suction hole 21b into the compression chamber 21a (the same ratio of the amount of circulating refrigerant is the same or less), 2% of lubricating oil flowing through the side gap of the slide vane (symbol 19 of fig. 3) and the upper and lower gaps of the rolling piston 23.

Further, about 2% of the lubricating oil flowing through the lubricating oil injection pipe 30 perforated in the oil reservoir 28 to the lubricating oil injection hole 30a is contained.

The high-pressure exhaust gas containing about 5% of lubricating oil is discharged from the axial end into the cavity of the end plate B housing 2B through the muffler 18a via the in-shaft hole 16a of the crankshaft 16. The high pressure oil-containing gas passing through the shaft center hole 16a lubricates the sliding surfaces of the crankshaft 16 and 2 bearings. Therefore, the invention adopts a spray lubrication mode.

Thereafter, the high-pressure gas passing through the motor 5 from the chamber of the end plate B housing 2B is discharged between the motor 2 and the compression structure 10, and the oil droplets are dropped into the oil reservoir chamber 28. The high-pressure gas injected into the end plate C housing 2C through the outer peripheral gap of the cylinder 21 is discharged from the exhaust pipe 4 into the refrigeration cycle.

In addition, since both the muffler 18a and the end plate C housing 2C are steel plates, the muffler welding 20 is also possible even by laser welding.

Further, instead of the lubricant flowing to the compression chamber 21a through the lubricant injection pipe 30, the side gap of the slide may be enlarged.

Example 2:

the horizontal 2-cylinder rotary compressor 102 shown in fig. 2 is equipped with: a first cylinder 31 and a second cylinder 32 in the compressor structure 11, and a middle partition 33 between the two cylinders. As in embodiment 1, the fixing is performed by a screw 24: these elements: the first and second bearings 18 and 22, the muffler 18 and the muffler 22a complete the compression structure 11 of the 2-cylinder.

Since the mounting position of the three-core terminal 25 is changed to the end plate B housing 2B, the outer diameter of the second bearing 22 can be enlarged. As in embodiment 1, 3-point welding 15 is performed on the outer periphery of the second bearing 22 from the outer periphery of the cylindrical housing 2a to which the electric motor 5 is fixed. In addition, as in example 1, muffler welding 20 was performed with the contact portion with the center of the end plate C housing 2C.

Since embodiment 2 increases the length of the arc welding 15 and the muffler welding 20 relative to embodiment 1, the fixing reliability of the compression structure 11 is further improved.

The high-pressure gas from the muffler 22a merges with the high-pressure gas from the muffler 18a, and flows into the cavity of the end plate B housing 2B through the in-shaft hole 16a of the crankshaft 16. During this process, the sliding mating surfaces of the crankshaft 16 and the 2 bearings are lubricated by spray. The high-pressure gas flowing through the electric motor 5 is discharged from the exhaust pipe 4.

Embodiment 2 is a twin-cylinder rotary compressor which is also possible by the technique disclosed in embodiment 1, and the fixing reliability of the compressor structure 11 is further improved by arc welding the outer periphery of the second bearing 22.

Example 3:

the vertical rotary compressor 103 shown in fig. 3 is an example of a design in which the design of the horizontal rotary compressor 101 of embodiment 1 is changed to a vertical one. The configuration of the three-core terminal 25 and the exhaust pipe 4 is a conventional design of a vertical type. In addition, spray lubrication was used as in examples 1 and 2. However, the through holes 16a of the crankshaft 16 do not pass through, and are discharged from the 2 opposite shaft holes 16 b.

The common design concept of the 3 embodiments is: the muffler 18a provided in the first bearing 18 is welded and fixed to the end plate C housing 2C. As a result, three-dimensional welding becomes possible, and the fixing strength of the compression structure 12 is significantly improved, compared to the conventional two-dimensional welding.

The rotary compressor is described below with reference to the embodiments in the drawings.

The rotary compressor 101 mainly includes a hermetic casing 2, an electric motor 5, a compression structure 10, and at least one muffler 18a.

The airtight housing includes: a cylindrical casing 2a and end plate casings 2b, 2c, both ends of the cylindrical casing 2a being open, the end plate casings 2b, 2c being connected to both ends of the cylindrical casing 2a, respectively. The electric motor 5 is disposed within the hermetic case 2 and includes a stator 6 and a rotor core 8.

The compression structure 10 is provided in the hermetic case 2 and driven by the electric motor 5, and the compression structure 10 mainly includes a cylinder 21, a first bearing 18, a second bearing 22, and the like, the crankshaft 16 is provided with a piston 23 penetrating the cylinder 21, the first bearing 18, the second bearing 22, and the crankshaft 16.

The first muffler 18a is provided on the compression structure 10 on a side of the compression structure 10 away from (away from) the electric motor 5. For example, in the example of fig. 1, the first muffler 18a is provided on the left side of the compression structure 10, and the first muffler 18a is adjacent to the first end plate housing 2C on the left side (i.e., the end plate C housing described above).

A plurality of first welding points 15 are provided between the outer peripheral surface of the compression structure 10 and the inner peripheral surface of the cylindrical housing 2. For example, the compression structure 10 and the cylindrical shell 2a may be fixed by arc welding, and the number of welding spots may be plural, for example, three, and may be equally spaced in the circumferential direction of the cylindrical shell 2a, that is, the pitch central angle of adjacent two welding spots is 120 °. A second weld 20 is provided between the first end plate housing 2c and the first muffler 18a.

By welding the cylindrical shell 2a and the compression structure 10 from the circumferential direction of the cylindrical shell 2a while increasing the welding process of the first end plate shell 2c and the first muffler 18a from the axial direction of the first end plate shell 2c, thereby achieving the weld fixation of the compression structure 10 from different dimensions in the circumferential direction and the axial direction, the fixation strength is increased by a multiple by increasing the axial welding manner.

In some embodiments, the plurality of first pads 15 are in the same plane. Here, it should be noted that, since the first welding point 15 is not a point in a geometric sense, the welding point has a certain area when welding, and the plurality of first welding points 15 are to be understood in a broad sense, i.e. substantially in the same plane.

As shown in fig. 1, the first end plate case 2c is attached to the center of the first muffler 18a, and welding is performed at the attachment of the two to form the second welding point 20. In the example of fig. 1, the first end plate shell 2c and the first muffler 18a have convex curved structures, and are attached at the top points of the convex curved structures, and by welding the attachment points outside the first end plate shell 2c, a second welding point 20 is added to match with a plurality of first welding points 15, so that the traditional plane welding (the welding points are on the same plane) is spatially changed into the three-dimensional welding (the welding points are on different endpoints of the spatial solid geometry) of the invention, and therefore, the welding strength is greatly increased.

As an alternative embodiment, the first welding spots 15 may be three and equally spaced circumferentially, and the second welding spot 20 may be one, so that the distances from the second welding spot 20 to the three first welding spots 15 are substantially equal, and the second welding spot 20 and the three first welding spots 15 are distributed on a cone, and the cone tip is the second welding spot 20, and the three first welding spots 15 are distributed on a circle of the cone bottom.

In this way, the welding performance is better than that of the prior three-point circumferential welding cylinder by adopting the relatively least welding spots and adding one second welding spot 20, so that compared with the prior art, the welding firmness and stability are greatly improved from the prior two-dimensional welding to the three-dimensional welding in the scheme.

In one embodiment, as shown in fig. 1, the compression structure 10 may be a single cylinder structure in which a first bearing 18 is provided on the left side and a second bearing 22 is provided on the right side of a cylinder 21, and the outer circumferential surface of the cylinder 21 is welded with the inner circumferential surface of a cylinder case 2a to form a first welding point 15. The first muffler 18a is provided on the first bearing 18, the second bearing 22 is close to the electric motor 5, and the outer peripheral surface of the flange portion of the second bearing 18, which is fitted to the cylinder, is radially spaced from the inner peripheral surface of the cylindrical housing 2a, thereby forming an annular radial space which can be used to avoid the three-core terminal 25, the cluster 26, and the like, which are penetrated through the cylindrical housing 2a, so that the three-core terminal 25 can be fixed in the middle region of the cylindrical housing 2a, shortening the motor lead-out wire 7c connected with the motor winding 7, and making the overall structure more compact.

Furthermore, it is due to the existence of the above-mentioned radial gap that at least a part of the three-core terminal 25 can be located therein, so that a portion corresponding to the flange portion is formed in the axial direction, and the arrangement is compact.

In another embodiment, the fixing of the compression structure 10 may also be achieved by welding a second bearing, which is a bearing remote from the first end plate housing 2c or the other side of the first muffler 18a. As in the double cylinder compressor of fig. 2, a plurality of first welding spots 15 are provided between the second bearing 22 and the cylinder case 2a, specifically, the first welding spots 15 are provided between the outer peripheral surface of the flange portion of the second bearing 22 and the cylinder case 2 a.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A rotary compressor, comprising:

a hermetic housing, the hermetic housing comprising: the device comprises a cylinder shell and end plate shells, wherein two ends of the cylinder shell are open, and the end plate shells are respectively connected with two ends of the cylinder shell;

the electric motor is arranged in the closed shell;

a compression structure portion disposed within the hermetic case and driven by the electric motor;

at least one muffler disposed on the compression structure;

a plurality of first welding spots are arranged between the outer peripheral surface of the compression structure part and the cylindrical shell, one of the silencers is arranged on one side of the compression structure part far away from the electric motor to form a first silencer, one of the end plate shells is adjacent to the first silencer to form a first end plate shell, and a second welding spot is arranged between the first end plate shell and the first silencer;

an electric motor, a rotary compression structure driven by the electric motor, and lubricating oil are accommodated in a sealed housing comprising a cylindrical housing and an end plate housing connected to the side surface of the cylindrical housing,

the compression structure includes:

at least one cylinder with a compression chamber,

A first bearing and a second bearing fixed on the two open surfaces of the compression chamber,

A crankshaft slidably engaged with the two bearings,

And a muffler forming an exhaust passage of the compression chamber on the first bearing,

the cylinder housing and the compression structure portion, and the end plate housing and the muffler are welded and fixed.

2. The rotary compressor of claim 1, wherein a shaft center hole provided in the crankshaft opens to the muffler.

3. The rotary compressor of claim 1, wherein a three-core terminal fixed to the cylindrical housing is provided between the motor and the compression structure.

4. The rotary compressor of claim 1, wherein a plurality of the first weld points are in the same plane.

5. The rotary compressor of claim 4, wherein a plurality of the first welding spots are equally spaced along the circumferential direction of the cylinder housing.

6. The rotary compressor of claim 5, wherein the first welding points are three.

7. The rotary compressor of claim 4, wherein a center of the first end plate housing is bonded to a center of the first muffler, and welding is performed at the bonding of the two to form the second welding point.

8. The rotary compressor of claim 7, wherein the first welding spots are three and equally spaced along the circumference of the cylinder housing, one of the second welding spots and the three first welding spots are distributed in a cone shape, wherein a vertex of the cone shape is the second welding spot, the three first welding spots are located on a base circle of the cone shape, and distances from the second welding spot to the three first welding spots are equal.

9. The rotary compressor of claim 1, wherein the compression structure comprises: the cylinder is characterized in that a first welding point is arranged between the outer peripheral surface of the cylinder and the cylinder shell, the first bearing is close to the first end plate shell, the second bearing is close to the electric motor, the first silencer is arranged on the first bearing, the outer peripheral surface of a flange part, attached to the cylinder, of the second bearing is spaced from the inner peripheral surface of the cylinder shell in the radial direction of the cylinder shell, a three-core terminal connected with the electric motor is fixedly arranged on the cylinder shell in a penetrating mode, and the three-core terminal at least partially corresponds to the second bearing in the axial direction of the cylinder shell.

10. The rotary compressor of claim 1, wherein the compression structure comprises: the cylinder comprises a plurality of cylinders, a first bearing and a second bearing, wherein the first bearing is close to the first end plate shell, the second bearing is close to the electric motor, and a first welding point is arranged between the outer peripheral surface of a flange part, attached to the cylinder, of the second bearing and the cylinder shell.