Compressor cover and housing assembly structure and compressor

Abstract

A compressor cover and housing assembly structure, and a compressor using the assembly structure. The assembly structure comprises a cover (1) and a housing (2), wherein the housing (2) has an annular axial end face, the radial outer portion of the axial end face being a radial flat surface (21), and the radial inner portion of the axial end face being a stepped surface (22) which sinks from the radial flat surface (21) towards the middle of the housing (2) to form a recessed boss (20); and the cover (1) is plate-shaped, the cover (1) has an inner face facing the axial end face, the outer periphery of the inner face being a mating flat surface (11) which matches and fits against the radial flat surface (21), and the inner face being provided with a protrusion (10) on the radial inner side of the mating flat surface (11) which matches and meshes with the recessed boss (20). A flattened plate-shaped design is used for the cover, and the mating flat surface located at the outer periphery and the protrusion are formed on the inner face of the cover, thereby forming a flange-free stepped cover, eliminating the need for the stretch flanging structure and process of the cover, and effectively reducing the overall height of the compressor.

Description

FIELD OF THE INVENTION

[0001] The present application relates to the technical field of compressors, and in particular to an assembly structure of a compressor housing cover and a compressor housing, and a compressor employing the assembly structure.BACKGROUND OF THE INVENTION

[0002] At present, rolling rotor compressors are frequently benchmarked against scroll compressors and reciprocating compressors in applications such as vehicle air conditioners, refrigeration and freezing equipment, kitchen air conditioners, and heat pump water heaters. In these application fields, horizontal-type rolling rotor compressors can meet height requirements, but their performance in a length dimension is somewhat limited. To meet the application requirements, vertical rolling rotor compressors need to be continuously reduced in height to form short-and-wide models. For short-and-wide models, the commonly adopted upper and lower housing cover structures of conventional rolling rotor compressors, as well as the installation methods between the housing covers and the compressor housing (cylindrical body), whether internal-insert or external-wrap, have become the primary bottleneck limiting the overall reduction of the compressor height.

[0003] FIGs. 1a, 1b, and 1c show an internal-insert assembly structure of an upper housing cover 01 and a housing 02 of an existing compressor. A lower end of the upper housing cover 01 is inserted into the housing 02, and the upper housing cover 01 is welded and sealed to the housing 02 by arc welding 05. To ensure the water pressure and pressure pulsation reliability of the compressor, the upper housing cover 01 is provided with a rounded corner R to distribute stress and avoid concentration. This prevents rupture caused by localized stress concentration and insufficient strength, thereby reducing the risk of refrigerant leakage, especially for flammable refrigerants. At the same time, it is necessary to ensure that an electrical clearance L1 between a motor winding 04 of a motor 03 inside the housing 02 and an inserted portion of the upper housing cover 01 meets the required specifications. The rounded corner R, which is designed to meet the pressure pulsation requirements, and the electrical clearance L1, which must satisfy the required specifications, prevent further reduction of a distance H1 from an inner top surface of the upper housing cover 01 to an upper end surface of a core of the motor 03, thereby making it impossible to further implement measures to reduce the overall height of the compressor.

[0004] FIGs. 2a and 2b show an external-wrap assembly structure of an upper housing cover 01 and a housing 02 of an existing compressor. A lower end of the upper housing cover 01 is sleeved on an upper end of the housing 02, and the upper housing cover 01 is welded and sealed to the housing 02 by arc welding 05. By processing the lower end of the upper housing cover 01 into a stepped shape and sleeving it on the upper end of the housing 02, a position of the arc welding 05 along the height of the housing 02 can be lowered compared with that of the internal-insert assembly structure of the upper housing cover 01 and the housing 02, thereby reducing a distance H2 between the inner top surface of the upper housing cover 01 and the upper end surface of the core of the motor 03, such that H2 < H1. However, lowering the height position of the arc welding 05 brings it closer to the motor winding 04 on the motor 03 inside the housing 02, causing the high-temperature heat from the arc welding 05 to potentially damage the motor winding 04.

[0005] FIGs. 3a and 3b respectively show schematic views of the internal-insert assembly structure and the external-wrap assembly structure of the upper housing cover 01 and the housing 02 of a conventional compressor, in which laser welding 06 is employed for sealing and fastening. The quality of laser welding is closely related to a fit precision of components after assembly, and the matching between thicknesses of the two components and the laser welding parameters is also critical. Therefore, if the laser welding parameters, including focal spot size, intensity, trajectory, angle, and dwell time, are not properly matched, the welding may result either in burn-through of the components or in insufficient weld strength, which may include porosity formation. For the internal-insert and external-wrap assembly structures of the upper housing cover 01 and the housing 02 of conventional compressors, meeting the requirements of sufficient strength, preventing burn-through, and avoiding porosity imposes excessively stringent demands on laser welding.

[0006] FIGs. 4a and 4b respectively show schematic views of an external-wrap assembly structure and an internal-insert assembly structure of a lower housing cover 01' and a housing 02 of a conventional compressor. For the assembly of the lower housing cover 01' and the housing 02, the greater a distance h1 / h2 from a center of a suction pipe seat ring 07, provided on a lower part of the housing 02, to a lower end surface of the housing 02, the less prone the lower end of the housing 02 is to deformation caused by the suction pipe seat ring 07. At the same time, the smaller a distance H3 / H4 from the center of the suction pipe seat ring 07 to an outer bottom surface of the lower housing cover 01', the more favorable it is for reducing the overall height of the compressor. The existing external-wrap and internal-insert assembly structures of the lower housing cover 01' and the housing 02 cannot effectively balance the above two requirements.SUMMARY OF THE INVENTION

[0007] An assembly structure of a compressor housing cover and a compressor housing, and a compressor employing the assembly structure, are provided to effectively reduce the overall height of the compressor.

[0008] The present application adopts the following technical solutions.

[0009] The assembly structure includes a housing cover and a housing having an annular axial end surface. The annular axial end surface includes a radial plane placed at a radially outer portion of the annular axial end surface, and a stepped surface placed at a radially inner portion of the annular axial end surface. The stepped surface is recessed from the radial plane toward a middle portion of the housing to form a recessed platform. The housing cover is a flat plate and has an inner side surface facing the annular axial end surface. An outer peripheral edge of the inner side surface is an abutting plane mated with and abutted against the radial plane. A protrusion is provided on the inner side surface at a radially inner side of the abutting plane and is adapted to engage with the recessed platform.

[0010] Preferably, an outer diameter of the housing cover is equal to an outer diameter of the housing.

[0011] Preferably, a radial width of the abutting plane is equal to a radial width of the radial plane.

[0012] Preferably, one or more steps are formed on each of the recessed platform and the protrusion, and the one or more steps of the protrusion are adapted to engage with the one or more steps of the recessed platform in a one-to-one correspondence.

[0013] Preferably, the stepped surface includes at least one tapered surface. The at least one tapered surface extends obliquely from a radially inner edge of the radial plane toward the middle portion of the housing. The protrusion includes a tapered section extending from a radially inner edge of the abutting plane, an outer peripheral surface of the tapered section being mated with the tapered surface.

[0014] Preferably, dimensional relationship between the tapered section and the tapered surface satisfies any one or more of the following conditions: a maximum diameter of the tapered section is not greater than a maximum diameter of the tapered surface; a minimum diameter of the tapered section is not greater than a minimum diameter of the tapered surface; or an inclination angle of the outer peripheral surface of the tapered section relative to the abutting plane is the same as an inclination angle of the tapered surface relative to the radial plane.

[0015] Preferably, the stepped surface further includes a platform surface extending radially from a radially inner edge of the tapered surface. The protrusion includes a tapered platform surface extending radially from a radially inner edge of the outer peripheral surface of the tapered section. The tapered platform surface is mated with and abutted against the platform surface.

[0016] Preferably, the abutting plane and the radial plane, and / or the protrusion and the recessed platform are joined by welding.

[0017] Preferably, the welding is laser welding, and a laser beam of the laser welding is radially incident on the housing and penetrates the housing to reach the housing cover.

[0018] The present application further provides a compressor. An upper housing cover and / or a lower housing cover is assembled with the housing using the assembly structure of the compressor housing cover and the compressor housing.

[0019] Compared with the prior art, the present application has the following significant advantages.

[0020] The assembly structure of the compressor housing cover and the compressor housing includes a plate-shaped housing cover. The abutting plane and the protrusion are formed on the inner side surface of the housing cover, and the abutting plane is located at the outer peripheral edge of the inner side surface, thereby forming a stepped housing cover without folded edges. This eliminates the need for a drawn flange structure and associated forming processes of the housing cover. Meanwhile, the radial plane and the recessed platform are formed on the axial end surface of the housing to respectively mate with the abutting plane and engage with the protrusion on the inner side surface of the housing cover. For the upper housing cover of the compressor, by adopting the plate-shaped housing cover of the assembly structure, a distance from the inner side surface of the housing cover to an upper end face of a core of a motor is significantly reduced, and a distance between the circumferential welding at the abutting interface of the housing cover and the axial end surface of the housing and the motor winding is increased, thereby reducing heat transfer. Compared with the existing external-wrap assembly structure of the upper housing cover and the housing, when the distance from an inner top surface of the upper housing cover (i.e., the inner surface of the housing cover) to an upper end surface the core of the motor is the same, the assembly structure of the compressor housing cover and the compressor housing positions the abutting interface between the housing cover and the axial end surface of the housing farther from the motor winding, thereby providing a larger electrical clearance, while still leaving room for further height reduction. For the lower housing cover of the compressor, by adopting the assembly structure of the compressor housing cover and the compressor housing, the plate-shaped housing cover can significantly reduce a distance from the center of the suction pipe seat ring at a lower portion of the housing to an outer bottom surface of the housing cover, thereby lowering the overall height of the compressor. At the same time, a distance from the center of the suction pipe seat ring to the lower end surface of the housing is increased, preventing deformation of the lower end surface of the housing caused by pre-punching of the suction pipe seat ring before press welding. Therefore, the assembly structure of the compressor housing cover and the compressor housing can effectively achieve a reduction in the overall height of the compressor. In addition, the plate-shaped housing cover does not require bending, and its rigidity and stiffness can be increased by appropriately increasing its thickness, thereby reducing the leakage rate caused by high-pressure pulsations. For the upper housing cover, adopting the plate-shaped housing cover also enlarges its planar area, which facilitates providing installation space for high-grade waterproof and dustproof sealing of the terminal posts.BRIEF DESCRIPTION OF DRAWINGS

[0021] FIG. 1a is a schematic view of an internal-insert assembly structure of an upper housing cover and a housing in the prior art. FIG. 1b is a schematic view of an installation of the internal-insert assembly structure in FIG. 1a. FIG. 1c is a partially enlarged schematic view of FIG. 1b. FIG. 2a is a schematic view of an external-wrap assembly structure of an upper housing cover and a housing in the prior art. FIG. 2b is a schematic view of an installation of the external-wrap assembly structure in FIG. 2a. FIG. 3a is a schematic view of an internal-insert assembly structure of an upper housing cover and a housing sealed by laser welding in the prior art. FIG. 3b is a schematic view of an external-wrap assembly structure of an upper housing cover and a housing sealed by laser welding in the prior art. FIG. 4a is a schematic view of an installation of an external-wrap assembly structure of a lower housing cover and a housing in the prior art. FIG. 4b is a schematic view of an installation of an internal-insert assembly structure of a lower housing cover and a housing in the prior art. FIG. 5 is a split schematic view of an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 1 of the present application. FIG. 6 is a schematic view of an installation of an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 1 of the present application. FIG. 7 is a schematic view of sealing and fastening an assembly structure of a compressor housing cover and a compressor housing by laser welding after assembly according to Embodiment 1 of the present application. FIG. 8 is a schematic view of diameter dimensions of an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 1 of the present application. FIG. 9 is a split partial schematic view of an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 1 of the present application. FIG. 10 is a partial schematic view of an installation of an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 1 of the present application. FIG. 11 is a split partial schematic view of an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 2 of the present application. FIG. 12 is a partial schematic view of an installation of an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 2 of the present application. FIG. 13 is a schematic view of an installation of an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 3 of the present application. Reference numerals

[0022] 01upper housing cover 01'lower housing cover 02housing 03motor 04motor winding 05arc welding 06laser welding 07suction pipe seat ring 1housing cover 10protrusion 101tapered section 102tapered platform surface 11abutting plane 2housing 20recessed platform 21radial plane 22stepped surface 221tapered surface 222platform surface 3circumferential weld DETAILED DESCRIPTION

[0023] The specific embodiments of the present application are described in further detail below with reference to the accompanying drawings. The embodiments described herein are intended solely to illustrate the present application and shall not be construed as limiting the present application.

[0024] In the description of the present application, it should be noted that terms such as "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like used to indicate directions or positional relationships are based on the orientations or positions shown in the accompanying drawings. They are provided solely for the purpose of facilitating and simplifying the description of the present application and do not imply that the devices or components must be constructed or operated in any particular orientation. Accordingly, they should not be construed as limiting the present application. In addition, the terms "first", "second," and the like are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0025] In the present application, unless otherwise specified and limited, terms such as "mount", "couple", "connect", and the like should be broadly understood, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it also can be communication inside two components. For those skilled in art, the specific meanings of the above terms in the context can be understood according to the specific situation.

[0026] Additionally, in the description of the present application, "plural" means two or more unless otherwise specified.Embodiment 1

[0027] FIGs. 5 to 10 show an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 1 of the present application. The assembly structure of the compressor housing cover and the compressor housing of the present application may be used to assemble an upper housing cover to the housing, and may also be used to assemble a lower housing cover to the housing. In other words, the compressor housing cover may be an upper housing cover and / or a lower housing cover. In Embodiment 1, the compressor housing cover is exemplified as the upper housing cover of the compressor.

[0028] Referring to FIGs. 5, 6, and 7, the assembly structure of the compressor housing cover and the compressor housing in Embodiment 1 includes a housing cover 1 and a housing 2. The housing 2 has an annular axial end surface, forming an end opening of the housing 2. The housing cover 1 is disposed on the axial end surface of the housing 2 to close the end opening of the housing 2. As an example, the housing cover 1 is the upper housing cover of the compressor. The annular axial end surface is provided on an upper end of the housing 2, forming an upper end opening of the housing 2. The housing cover 1, as the upper housing cover, is disposed on the axial end surface of the upper end of the housing 2 to close the upper end opening of the housing 2.

[0029] In Embodiment 1, the axial end surface of the housing 2 includes a radially outer portion away from an axis of the housing 2 and a radially inner portion close to the axis of the housing 2. The radially outer portion of the axial end surface of the housing 2 is a radial plane 21, which is perpendicular to an axis of the housing 2 and extends in a radial direction of the housing 2. The radial plane 21 is annular. The radially inner portion of the axial end surface of the housing 2 is a stepped surface 22, which is recessed from the radial plane 21 toward a middle portion of the housing 2 to form a recessed platform 20. The stepped surface 22 is annular, so that the recessed platform 20 is a ring shape. The housing cover 1 is a flat plate and has an inner side surface facing the axial end surface of the housing 2. An outer peripheral edge of the inner side surface of the housing cover 1 forms an abutting plane 11 that mates with and abuts against the radial plane 21 of the axial end surface of the housing 2. The abutting plane 11 is annular. The abutting plane 11 is perpendicular to an axis of the housing cover 1 and extends in a radial direction of the housing cover 1. A protrusion 10 is provided on the inner side surface of the housing cover 1 at a radially inner side of the abutting plane 11. The protrusion 10 is adapted to engage with the recessed platform 20 on the axial end surface of the housing 2. During assembly, the inner side surface of the housing cover 1 abuts against the axial end surface of the housing 2, so that the abutting plane 11 on the inner side surface of the housing cover 1 is in contact with the radial plane 21 on the axial end surface of the housing 2, and the protrusion 10 on the inner side surface of the housing cover 1 engages the recessed platform 20 on the axial end surface of the housing 2, thereby achieving the assembly of the housing cover 1 and the housing 2. After the housing cover 1 is installed on the housing 2, circumferential welding can be performed to seal and securely connect the two components.

[0030] In Embodiment 1, the assembly structure of the compressor housing cover and the compressor housing includes a plate-shaped housing cover 1. The abutting plane 11 and the protrusion 10 are formed on the inner side surface of the housing cover 1, and the abutting plane 11 is located at the outer peripheral edge of the inner side surface, thereby forming a stepped housing cover without folded edges. This eliminates the need for a drawn flange structure and associated forming processes of the housing cover. Meanwhile, the radial plane 21 and the recessed platform 20 are formed on the axial end surface of the housing 2 to respectively mate with the abutting plane 11 and engage with the protrusion 10 on the inner side surface of the housing cover 1. For the upper housing cover of the compressor, by adopting the plate-shaped housing cover 1 of the assembly structure according to the Embodiment 1, a distance H5 from the inner side surface of the housing cover 1 to an upper end face of a core of a motor 03 is significantly reduced, and a distance between the circumferential welding at the abutting interface of the housing cover 1 and the axial end surface of the housing 2 and the motor winding 04 is increased, thereby reducing heat transfer. Compared with the existing external-wrap assembly structure of the upper housing cover and the housing shown in FIG. 2b, when the distance from an inner top surface of the upper housing cover 01 (i.e., the inner surface of the housing cover 1) to an upper end surface of the core of the motor 03 is the same (i.e., H5 equal to H2), the assembly structure of the compressor housing cover and the compressor housing according to Embodiment 1 positions the abutting interface between the housing cover 1 and the axial end surface of the housing 2 farther from the motor winding 04, thereby providing a larger electrical clearance L2, while still leaving room for further height reduction. Therefore, the assembly structure of the compressor housing cover and the compressor housing according to Embodiment 1 can effectively achieve a reduction in the overall height of the compressor. In addition, the plate-shaped housing cover 1 does not require bending, and its rigidity and stiffness can be increased by appropriately increasing its thickness, thereby reducing the leakage rate caused by high-pressure pulsations. For the upper housing cover, adopting the plate-shaped housing cover 1 also enlarges its planar area, which facilitates providing installation space for high-grade waterproof and dustproof sealing of the terminal posts.

[0031] Referring to FIG. 8, in Embodiment 1, preferably, an outer diameter of the housing cover 1 is equal to an outer diameter of the housing 2, each having a diameter of ΦD, so that after assembly, outer peripheral surfaces of the housing cover 1 and the housing 2 lie on the same circumferential surface, thereby ensuring a uniform appearance.

[0032] Referring to FIG. 9, in Embodiment 1, preferably, a radial width A1 of the abutting plane 11 on the inner side surface of the housing cover 1 is equal to a radial width A2 of the radial plane 21 on the axial end surface of the housing 2, thereby ensuring sufficient contact area at the abutting interface and allowing the protrusion 10 on the inner side surface of the housing cover 1 to engage with the recessed platform 20 on the axial end surface of the housing 2.

[0033] Preferably, one or more steps are formed on each of the recessed platform 20 on the axial end surface of the housing 2 and the protrusion 10 on the inner side surface of the housing cover 1, and the one or more steps of the protrusion 10 are adapted to engage with the one or more steps of the recessed platform 20. That is, at least two steps are formed between the axial end surface of the housing 2 and the inner side surface of the housing cover 1.

[0034] In Embodiment 1, preferably, the stepped surface 22 on the axial end surface of the housing 2 includes at least one tapered surface 221, which extends obliquely from a radially inner edge of the radial plane 21 toward a middle portion of the housing 2. The protrusion 10 on the inner side surface of the housing cover 1 includes a tapered section 101 extending from the radially inner edge of the abutting plane 11, and an outer peripheral surface of the tapered section 101 mates with the tapered surface 221. The tapered surface 221 and the tapered section 101 are provided to form steps with a taper, which are advantageous for increasing the contact area between the protrusion 10 on the inner side surface of the housing cover 1 and the recessed platform 20 on the axial end surface of the housing 2.

[0035] With reference to FIGs. 8 and 9, in Embodiment 1, preferably, dimensional relationship between the tapered section 101 of the protrusion 10 on the inner side surface of the housing cover 1 and the tapered surface 221 of the stepped surface 22 on the axial end surface of the housing 2 satisfies any one or more of the following conditions: a maximum diameter ΦD1 of the tapered section 101 is not greater than a maximum diameter ΦD2 of the tapered surface 221; a minimum diameter Φd1 of the tapered section 101 is not greater than a minimum diameter Φd2 of the tapered surface 221; and an inclination angle θ1 of the outer peripheral surface of the tapered section 101 relative to the abutting plane 11 is the same as an inclination angle θ2 of the tapered surface 221 relative to the radial plane 21.

[0036] Furthermore, the stepped surface 22 on the axial end surface of the housing 2 further includes a platform surface 222 extending radially from a radially inner edge of the tapered surface 221, and the protrusion 10 on the inner side surface of the housing cover 1 includes a tapered platform surface 102 extending radially from a radially inner edge of the outer peripheral surface of the tapered section 101. The tapered platform surface 102 mates with and abuts against the platform surface 222.

[0037] In a preferred embodiment, with reference to FIGs. 9 and 10, a radial width A1 of the abutting plane 11 on the inner side surface of the housing cover 1 is equal to a radial width A2 of the radial plane 21 on the axial end surface of the housing 2. The maximum diameter ΦD1 of the tapered section 101 of the protrusion 10 on the inner side surface of the housing cover 1 is equal to the maximum diameter ΦD2 of the tapered surface 221 of the stepped surface 22 on the axial end surface of the housing 2. The minimum diameter Φd1 of the tapered section 101 is equal to the minimum diameter Φd2 of the tapered surface 221. The inclination angle θ1 of the outer peripheral surface of the tapered section 101 relative to the abutting plane 11 is the same as the inclination angle θ2 of the tapered surface 221 relative to the radial plane 21. Under these conditions, an axial extension height T1 of the tapered section 101 is equal to an axial extension height T2 of the tapered surface 221, and a distance B1 from the radially inner edge of the outer peripheral surface of the tapered section 101 to an outer diameter of the housing cover 1 is equal to a distance B2 from the radially inner edge of the tapered surface 221 to an outer diameter of the housing 2. When the stepped surface 22 includes a platform surface 222, the platform surface 222 extends radially from the radially inner edge of the tapered surface 221 to an inner diameter of the housing 2. Therefore, a distance C from the inner diameter to the outer diameter of the housing 2 is greater than the distance B2 from the radially inner edge of the tapered surface 221 to the outer diameter of the housing 2. If the stepped surface 22 does not include the platform surface 222, the radially inner edge of the tapered surface 221 extends to the inner diameter of the housing 2. In this case, a distance from the inner diameter to the outer diameter of the housing 2 is equal to a distance from the radially inner edge of the tapered surface 221 to the outer diameter of the housing 2.

[0038] In Embodiment 1, preferably, the abutting plane 11 on the inner side surface of the housing cover 1 and the radial plane 21 on the axial end surface of the housing 2, and / or the protrusion 10 on the inner side surface of the housing cover 1 and the recessed platform 20 on the axial end surface of the housing 2, are closely joined by welding. With reference to FIG. 10, circumferential welds 3 are formed by circumferential welding both between the abutting plane 11 on the inner side surface of the housing cover 1 and the radial plane 21 on the axial end surface of the housing 2, and between the protrusion 10 on the inner side surface of the housing cover 1 and the recessed platform 20 on the axial end surface of the housing 2, preferably between the tapered platform surface 102 of the tapered section 101 of the protrusion 10 and the platform surface 222 of the stepped surface 22 of the recessed platform 20. In Embodiment 1, the number of the circumferential welds 3 and their welding positions can be determined according to the number of steps formed between the axial end surface of the housing 2 and the inner side surface of the housing cover 1.

[0039] In Embodiment 1, preferably, the circumferential welds 3 are formed by laser welding, in which the laser beam is radially incident on the housing 2 and penetrates the housing 2 to reach the housing cover 1. By adopting laser circumferential welding, the laser beam is incident along a radial direction of the housing 2 and, after penetrating the housing 2, directly reaches the outer diameter of the housing cover 1 or the outer diameter of the protrusion 10 on the inner side surface of the housing cover 1. This induces flow of the molten material and thermal resistance during fusion, which concentrates heat at the abutting interface between the housing cover 1 and the housing 2, thereby increasing the contact area and bonding strength. Moreover, the precision requirements for laser welding adjustment can be moderately relaxed while achieving the same effect.Embodiment 2

[0040] FIGs. 11 to 12 show an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 2 of the present application. Embodiment 2 is substantially the same as Embodiment 1, and the same features are not described again. The difference lies in that, in Embodiment 2, the radially inner edge of the tapered surface 221 of the stepped surface 22 on the axial end surface of the housing 2 extends to the inner diameter of the housing 2, and the stepped surface does not include the platform surface 222 as in Embodiment 1, thereby simplifying the structure.

[0041] In Embodiment 2, preferably, with reference to FIG. 11, the radial width A1 of the abutting plane 11 on the inner side surface of the housing cover 1 is equal to the radial width A2 of the radial plane 21 on the axial end surface of the housing 2. The maximum diameter ΦD1 of the tapered section 101 of the protrusion 10 on the inner side surface of the housing cover 1 is equal to the maximum diameter ΦD2 of the tapered surface 221 of the stepped surface 22 on the axial end surface of the housing 2. The minimum diameter Φd1 of the tapered section 101 is smaller than the minimum diameter Φd2 of the tapered surface 221. The inclination angle θ1 of the outer peripheral surface of the tapered section 101 relative to the abutting plane 11 is the same as the inclination angle θ2 of the tapered surface 221 relative to the radial plane 21. Under these conditions, the axial extension height T1 of the tapered section 101 is greater than the axial extension height T2 of the tapered surface 221, and the distance B1 from the radially inner edge of the outer peripheral surface of the tapered section 101 to the outer diameter of the housing cover 1 is greater than the distance B2 from the radially inner edge of the tapered surface 221 to the outer diameter of the housing 2.

[0042] In Embodiment 2, with reference to FIG. 12, circumferential welds 3 are formed both between the abutting plane 11 on the inner side surface of the housing cover 1 and the radial plane 21 on the axial end surface of the housing 2, and between the radially inner edge of the tapered surface 221 on the axial end surface of the housing 2 and the outer peripheral surface of the tapered section 101 of the protrusion 10 on the inner side surface of the housing cover 1.Embodiment 3

[0043] FIGs. 11 to 13 show an assembly structure of a compressor housing cover and a compressor housing according to Embodiment 3 of the present application. Embodiment 3 is substantially the same as Embodiment 1, and the same features are not described again. The difference is that, in Embodiment 3, the housing cover 1 serves as the lower housing cover of the compressor, that is, the assembly structure of the housing cover and the housing according to the present application is applied to the assembly between the lower housing cover of the compressor and the housing. For assembly of the lower housing cover with the housing, a lower end of the housing 2 has an annular axial end surface, forming a lower end opening of the housing 2. The housing cover 1, as the lower housing cover, is disposed on the axial end surface at the lower end of the housing 2 to close the lower end opening of the housing 2.

[0044] The assembly structure of the compressor housing cover and the compressor housing in Embodiment 3 may also be realized by applying the assembly structure of the compressor housing cover and the compressor housing according to Embodiment 2 to the assembly between the lower housing cover of the compressor and the housing.

[0045] For the lower housing cover of the compressor, by adopting the assembly structure of the compressor housing cover and the compressor housing according to Embodiment 3, the plate-shaped housing cover 1 can significantly reduce a distance H6 from the center of the suction pipe seat ring 07 at a lower portion of the housing 2 to an outer bottom surface of the housing cover 1, thereby lowering the overall height of the compressor. At the same time, a distance h3 from the center of the suction pipe seat ring 07 to the lower end surface of the housing 2 is increased, preventing deformation of the lower end surface of the housing 2 caused by pre-punching of the suction pipe seat ring 07 before press welding. Therefore, the assembly structure of the compressor housing cover and the compressor housing according to Embodiment 3 can effectively achieve a reduction in the overall height of the compressor. Compared with the existing external-wrap and internal-insert assembly structures of the lower housing cover and the housing shown in FIGs. 4a and 4b, the assembly structure of the compressor housing cover and the compressor housing according to Embodiment 3 achieves a maximum distance h3 from the center of the suction pipe seat ring 07 to the lower end surface of the housing 2 (h3 > h2 > h1) and a minimum distance H6 from the center of the suction pipe seat ring 07 to the outer bottom surface of the housing cover 1 (H6 < H4 < H3). Therefore, the assembly structure of the compressor housing cover and the compressor housing according to Embodiment 3 is optimal both in preventing deformation of the lower end surface of the housing 2 caused by the suction pipe seat ring 07 and in reducing the overall height of the compressor.Embodiment 4

[0046] Embodiment 4 provides an embodiment of a compressor according to the present application. In Embodiment 4, the compressor adopts the assembly structure of the compressor housing cover and the compressor housing according to the present application, specifically, the assembly of the upper and / or lower housing cover with the housing of the compressor employs any one of the assembly structures of the compressor housing cover and the compressor housing described in Embodiments 1 to 3 of the present application.

[0047] The above description merely illustrates the preferred embodiments of the present application. It should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the principles of the present application, and such modifications and substitutions should also be considered within the scope of protection of the present application.

Claims

1. An assembly structure of a compressor housing cover and a compressor housing, comprising a housing (2) having an annular axial end surface, wherein the annular axial end surface comprises a radial plane (21) placed at a radially outer portion of the annular axial end surface, and a stepped surface (22) placed at a radially inner portion of the annular axial end surface, wherein the stepped surface (22) is recessed from the radial plane (21) toward a middle portion of the housing (2) to form a recessed platform (20); and a housing cover (1), wherein the housing cover (1) is a flat plate and has an inner side surface facing the annular axial end surface, wherein an outer peripheral edge of the inner side surface is an abutting plane (11) mated with and abutted against the radial plane (21), wherein a protrusion (10) is provided on the inner side surface at a radially inner side of the abutting plane (11) and is adapted to engage with the recessed platform (20).

2. The assembly structure according to claim 1, wherein an outer diameter of the housing cover (1) is equal to an outer diameter of the housing (2).

3. The assembly structure according to claim 1, wherein a radial width of the abutting plane (11) is equal to a radial width of the radial plane (21).

4. The assembly structure according to claim 1, wherein one or more steps are formed on each of the recessed platform (20) and the protrusion (10), and the one or more steps of the protrusion (10) are adapted to engage with the one or more steps of the recessed platform (20) in a one-to-one correspondence.

5. The assembly structure according to claim 1, wherein the stepped surface (22) comprises at least one tapered surface (221), wherein the at least one tapered surface (221) extends obliquely from a radially inner edge of the radial plane (21) toward the middle portion of the housing (2), wherein the protrusion (10) comprises a tapered section (101) extending from a radially inner edge of the abutting plane (11), an outer peripheral surface of the tapered section (101) being mated with the tapered surface (221).

6. The assembly structure according to claim 5, wherein a dimensional relationship between the tapered section (101) and the tapered surface (221) satisfies any one or more of the following conditions: a maximum diameter of the tapered section (101) is not greater than a maximum diameter of the tapered surface (221); a minimum diameter of the tapered section (101) is not greater than a minimum diameter of the tapered surface (221); or an inclination angle of the outer peripheral surface of the tapered section (101) relative to the abutting plane (11) is the same as an inclination angle of the tapered surface (221) relative to the radial plane (21).

7. The assembly structure according to claim 5, wherein the stepped surface (22) further includes a platform surface (222) extending radially from a radially inner edge of the tapered surface (221), wherein the protrusion (10) includes a tapered platform surface (102) extending radially from a radially inner edge of the outer peripheral surface of the tapered section (101), the tapered platform surface (102) being mated with and abutted against the platform surface (222).

8. The assembly structure according to claim 1, wherein the abutting plane (11) and the radial plane (21), and / or the protrusion (10) and the recessed platform (20) are joined by welding.

9. The assembly structure according to claim 8, wherein the welding is laser welding, and a laser beam of the laser welding is radially incident on the housing (2) and penetrates the housing (2) to reach the housing cover (1).

10. A compressor, wherein an upper housing cover and / or a lower housing cover of the compressor is / are assembled with the housing (2) by using the assembly structure of the compressor housing cover and the compressor housing according to any one of claims 1 to 9.

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