Compressor

Abstract

The present application discloses a compressor (1) comprising: a sealed container (10); a compression mechanism (20) housed in the sealed container (10); a motor element (30) comprising an electric motor stator (32) fitted and welded to the sealed container (10); and a welding portion (40) that welds the sealed container (10) and the electric motor stator (32) together. Contact areas (50) are included in the outer edge portion of the electric motor stator (32) and in the sealed container (10). In the contact region (50), the inner peripheral surface of the sealed container (10) and the electric motor stator (32) are in contact and fixed. A welded portion (40) is formed in the contact region (50).

Description

Technical Field

[0001] The present invention relates to a compressor. Background Art

[0002] A known compressor includes: a motor element housed inside a sealed container, the motor element including an electric motor stator fitted and welded to the sealed container; and a welding portion that welds the sealed container and the electric motor stator together, as disclosed in International Publication No. WO 2018 / 150483A1, which is hereinafter referred to as PTL1.

[0003] In PTL1, each welding portion is formed via a recessed portion formed between the sealed container and the electric motor stator.

[0004] In the case where the compressor is mounted on a vehicle such as a truck, during movement, the compressor may be subjected to large vibrations or large impacts. If the compressor is subjected to large vibrations or large impacts, the electric motor stator may shift from a predetermined position. As a result, the performance of the compressor may be affected.

[0005] Therefore, it is necessary to develop a compressor that can prevent the electric motor stator from moving from a predetermined position even if the compressor is subjected to large vibrations or large impacts.

[0006] Citation List

[0007] Patent Documents

[0008] PTL1: International Publication No. WO 2018 / 150483A1 Summary of the Invention

[0009] An object of the present invention is to provide a compressor that can prevent the electric motor stator from moving from a predetermined position even if the compressor is subjected to large vibrations or large impacts.

[0010] To achieve the above object, an embodiment of the present invention provides a compressor including: a cylindrical sealed container; a compression mechanism housed in the sealed container and configured to compress refrigerant gas; a motor element housed inside the sealed container and driving the compression mechanism, the motor element including an electric motor stator fitted and welded to the sealed container; and a welding portion that welds the sealed container and the electric motor stator together, wherein the compressor includes a contact area included in an outer edge portion of the electric motor stator and the sealed container, in which an inner peripheral surface of the sealed container and the electric motor stator contact and are fixed, and wherein the welding portion is formed to extend from the sealed container to the inside of the electric motor stator in the contact area.

[0011] According to an embodiment of the present invention, the welded portion is formed to extend from the sealed container to the inside of the electric motor stator in the contact area. That is, in the contact area, the sealed container and the electric motor stator are welded together, and the welded portion, the sealed container, and the electric motor stator are fixed without a gap therebetween.

[0012] In addition, the welded portion not only welds and fixes the sealed container and the electric motor stator together, but also serves as a member for preventing the electric motor stator from moving and shifting relative to the sealed container.

[0013] Thus, the sealed container and the electric motor stator are firmly fixed via the welded portion, so that a high fixing strength between the sealed container and the electric motor stator can be maintained.

[0014] Therefore, even when the compressor is subjected to large vibrations or large impacts during operation, the compressor can prevent the electric motor stator from moving from a predetermined position. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The principles and advantages of the present invention will become apparent in the following description taken in conjunction with the accompanying drawings, in which:

[0016] Figure 1 is an explanatory view showing a schematic configuration of a compressor 1 including a welded portion 40 according to an embodiment of the present invention;

[0017] Figure 2 is a cross-sectional view taken along line II-II of Figure 1 ; and

[0018] Figure 3 is an enlarged view of the welded portion 40. DETAILED DESCRIPTION

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0020] Figure 1 is an explanatory view showing a schematic configuration of a compressor 1 according to an embodiment. The compressor 1 is a fluid machine configured to compress and discharge a fluid (i.e., a gaseous refrigerant), and may be a component of a refrigeration cycle device. The compressor 1 according to the embodiment is a vertically mounted hermetic compressor.

[0021] As Figure 1As shown, the compressor 1 is a scroll compressor and includes: a cylindrical sealed container 10; a suction pipe 12 that is installed through the top surface of the sealed container 10 and is formed as a hollow cylindrical pipe; a discharge pipe 14 that discharges gaseous refrigerant to the outside; an injection pipe 15 that guides intermediate-pressure gaseous refrigerant existing in the refrigerant circuit; a scroll compression mechanism 20 that is configured to compress low-pressure gaseous refrigerant in a compression chamber 28; and a motor element 30 that is accommodated in the sealed container 10 and is configured to drive the compression mechanism 20.

[0022] The upper portion of the compression mechanism 20 is supported by an intermediate housing 10a of the sealed container 10. The compression mechanism 20 is fixed to the intermediate housing 10a of the sealed container 10 by shrink fitting or other methods. A sub-frame 16 is provided below the motor element 30. The sub-frame 16 is fixed to the inner peripheral surface of the sealed container 10. An oil sump 18 is formed on the bottom of the sealed container 10. Refrigeration oil for lubricating sliding components such as bearings accumulates in the oil sump 18.

[0023] The suction pipe 12 is connected to the side surface of the sealed container 10 and is configured to suck low-pressure gaseous refrigerant from the outside into the compression mechanism 20. The discharge pipe 14 is connected to the side of the sealed container 10 and is configured to discharge high-pressure gaseous refrigerant to the outside of the scroll compressor 1. The injection pipe 15 guides intermediate-pressure gaseous refrigerant existing in the refrigerant circuit to the compression chamber 28 of the compression mechanism 20.

[0024] The compression mechanism 20 is accommodated in the sealed container 10 and is configured to compress the refrigerant sucked from the suction pipe 12 by the rotation of a crankshaft 36 that rotates by means of the motor element 30. As Figure 1 shown, the compression mechanism 20 includes a stationary scroll member 22 and a moving scroll member 26.

[0025] The stationary scroll member 22 is fixed to the intermediate housing 10a at the lower end portion of the stationary scroll member 22. As Figure 1 shown, the stationary scroll member 22 includes a stationary scroll base plate 22a and a stationary scroll spiral scroll 22b that has an involute shape to form a spiral body and that stands on one surface of the stationary scroll base plate 22a. A discharge port 24 is formed in the central portion of the stationary scroll member 22 and is configured to discharge the compressed refrigerant.

[0026] The moving scroll member 26 is configured to orbit relative to the stationary scroll member 22 without rotating by means of an Oldham mechanism (not shown). As Figure 1As shown, the orbiting scroll member 26 includes an orbiting scroll base plate 26a and an orbiting scroll spiral scroll 26b. The orbiting scroll spiral scroll 26b has an involute shape to form a spiral body and the orbiting scroll spiral scroll 26b stands on one surface of the orbiting scroll base plate 26a. An orbiting bearing 26c is formed in a substantially central portion on the lower surface of the orbiting scroll base plate 26a. The orbiting bearing 26c is formed in a cylindrical shape with a bottom. In order to orbit the orbiting scroll member 26, an eccentric shaft portion 36b is inserted into the orbiting bearing 26c. The eccentric shaft portion 36b is mounted on the upper end portion of a main shaft portion 36a described later.

[0027] The orbiting scroll spiral scroll 26b is configured to engage with the fixed scroll spiral scroll 22b to form a compression chamber 28 between the fixed scroll spiral scroll 22b and the orbiting scroll spiral scroll 26b. The orbiting scroll member 26 is configured to orbit relative to the fixed scroll member 22.

[0028] As Figure 2 As shown, the motor element 30 includes: an electric motor stator 32 that is fixed to the inner peripheral surface of the sealed container 10 by shrink fitting or other methods; an electric motor rotor 34 that is rotatably accommodated on the inner peripheral side portion of the electric motor stator 32; and a crankshaft 36 (main shaft portion 36a) that is fixed to the electric motor rotor 34 by shrink fitting or other methods.

[0029] The electric motor stator 32 is connected to a glass terminal 37 via a wire. The electric motor stator 32 is supplied with power from the outside via the glass terminal 37 and the wire. The electric motor rotor 34 is configured to rotate when power is supplied to the electric motor stator 32 and transmit a driving force to the orbiting scroll member 26 through the crankshaft 36.

[0030] The electric motor stator 32 is fixed to the inner peripheral surface of the sealed container 10 by fitting and welding to the sealed container 10. The electric motor stator 32 has a multi-layer coil 38 made via an insulator (not shown). When viewed from above, the coil 38 is arranged in a plurality of openings 32a formed along the inner peripheral surface of the electric motor stator 32. In the present embodiment, the number of openings is 18. The coil 38 is coated with an insulating coating material.

[0031] The electric motor stator 32 is made of electrical steel, which is a high magnetic permeability material. The material of the electromagnetic steel is, for example, silicon steel.

[0032] As Figure 2As shown, at the outer edge portion of the electric motor stator 32 and in the sealed container 10, the sealed container 10 and the electric motor stator 32 include a contact area 50 where the inner peripheral surface of the sealed container 10 and the electric motor stator 32 are in contact with each other, and a non-contact area where the inner peripheral surface of the sealed container 10 and the electric motor stator 32 are not in contact with each other. The contact area 50 is the area colored gray in Figure 2 and Figure 3 .

[0033] That is to say, the contact area 50 is included in the outer edge portion of the electric motor stator 32 and in the sealed container 10, and in this contact area 50, the inner peripheral surface of the sealed container 10 and the electric motor stator 32 are in contact and fixed. At least one gap 52 is provided in the non-contact area, and compressed gas flows between the inner peripheral surface of the sealed container 10 and the electric motor stator 32 through the at least one gap 52. The non-contact area is the area other than the contact area 50.

[0034] As Figure 2 and Figure 3 shown, the welding portion 40 is formed to weld the middle portion 10a of the housing of the sealed container 10 to the electric motor stator 32. The welding portion 40 is formed to be located in the contact area 50 and is formed to extend from the sealed container 10 to the inside of the electric motor stator 32 in the contact area 50.

[0035] In the present embodiment, in order to ensure a high fixing strength between the sealed container 10 and the electric motor stator 32, the number of the welding portions 40 is 4. The number of the welding portions 40 is not limited to 4, and may be, for example, 1 to 3, 5 or more. In addition, the welding portions 40 may be formed at different height positions.

[0036] The welding portion 40 is formed to extend from the sealed container 10 to the inside of the electric motor stator 32, so that the tip portion on the side of the electric motor stator 32 is curved when viewed from above.

[0037] In the case where the radius of curvature of the welding portion 40 on the side of the motor stator is large, when the compressor 1 is subjected to large vibration or large impact, the fixing strength between the sealed container 10 and the motor electric stator 32 may become insufficient, and thus cracks may appear around the welding portion 40.

[0038] In the present embodiment, from the perspective of preventing cracks from forming around the welding portion 40 when the compressor 1 is subjected to large vibration or large impact, the radius of curvature of the welding portion 40 on the side of the electric motor stator is smaller than the radius of curvature of both the sealed container 10 and the electric motor stator 32.

[0039] The eccentric shaft portion 36b of the crankshaft 36 located above the electric motor rotor 34 is rotatably supported in the radial direction by a cylindrical orbiting bearing 26c mounted below the orbiting scroll base plate 26a. The main shaft portion 36a is fitted in the main bearing 39 and slides along the main bearing 39 by means of an oil film of lubricating oil. The eccentric shaft portion 36b eccentric with respect to the main shaft portion 36a is mounted on the upper end portion of the crankshaft 36.

[0040] A pump element 19, such as a positive displacement pump, is mounted at the lower end portion of the crankshaft 36. The pump element 19 supplies the refrigeration oil accumulated in the oil sump 18 to sliding members, such as the main bearing 39. The pump element 19 is mounted on the sub-frame 16 and supports the crankshaft 36 in the axial direction on the upper end surface of the pump element 19.

[0041] Next, a method for fixing the electric motor stator 32 to the sealed container 10 will be described.

[0042] First, the electric motor stator 32 is inserted into the sealed container 10 such that each gap 52 is located in a non-contact area other than the contact area 50. Thereby, arc spot welding can be performed from the outside of the sealed container 10 so that a welded portion 40 can be formed in the contact area 50 in a subsequent step.

[0043] Second, the electric motor stator 32 is fitted into the sealed container 10. The fitting of the sealed container 10 and the electric motor stator 32 is preferably a press fit or a shrink fit.

[0044] Third, arc spot welding is performed to weld the electric motor stator 32 to the sealed container 10. In arc spot welding, the metal members in contact with each other and the welding metal rod are melted by arc discharge, and the melted metal fills the melted portions of the metal parts in contact with each other. Thereby, a welded portion 40 for welding the sealed container 10 to the stator in the contact area 50 is formed by solidifying the melted metal.

[0045] The welding method between the sealed container 10 and the electric motor stator 32 is not limited to arc spot welding, and other welding methods, such as laser welding, can be used.

[0046] Next, with reference to Figures 1 to 3 The operation of the compressor 1 including the welded portion 40 between the sealed container 10 and the electric motor stator 32 will be described in detail. Hereinafter, the case where the compressor is mounted on a vehicle such as a truck will be described as an example.

[0047] When the compressor 1 operates, the compressed refrigerant is discharged from the discharge port 24 to the discharge pipe 14 through each gap 52 located in the non-contact area between the sealed container 10 and the electric motor stator 32.

[0048] During vehicle movement, there are situations where the compressor 1 is subject to large vibrations or large impacts.

[0049] In this embodiment, the welded portion 40 is formed to extend from the sealed container 10 to the inside of the electric motor stator 32 in the contact area 50. That is, in the contact area 50, the sealed container 10 and the electric motor stator 32 are welded together, and the welded portion 40, the sealed container 10, and the electric motor stator 32 are fixed without gaps between them.

[0050] Furthermore, at least one gap 52 is provided in the non-contact area other than the contact area 50, and compressed gas flows between the electric motor stator 32 and the inner peripheral surface of the sealed container 10 through the at least one gap 52. That is, the welded portion 40 is not included in the non-contact area. Therefore, the compressor 1 enables reliable maintenance of the high fixing strength between the sealed container 10 and the motor stator.

[0051] Furthermore, the welded portion 40 in the contact area 50 not only welds and fixes the sealed container 10 and the electric motor stator 32 together, but also serves as a member for preventing the electric motor stator 32 from moving and shifting relative to the sealed container 10.

[0052] Furthermore, since the number of the welded portions 40 is 4, even if the compressor 1 is subject to large vibrations or large impacts, high fixing strength between the sealed container 10 and the electric motor stator 32 can be ensured.

[0053] Thus, the sealed container 10 and the electric motor stator 32 are firmly fixed via the welded portion 40, so that high fixing strength between the sealed container 10 and the electric motor stator 32 can be maintained.

[0054] Therefore, even if the compressor 1 is subject to large vibrations or large impacts during movement, the compressor 1 can prevent the electric motor stator 32 from moving from the predetermined position.

[0055] Although specific embodiments of the present invention have been disclosed, described, and illustrated in the drawings, this is only for the purpose of better understanding the principles of the present invention, rather than as a limitation on the scope and spirit of the teachings of the present invention. Without departing from the scope determined by the claims of the present invention, adjustments and modifications to various structures, such as adjustments and modifications to the design or materials of the present invention, the installation mechanisms of each part and component, or the embodiments, are possible and obvious to those skilled in the art.

[0056] List of Reference Numerals

[0057] 1: Compressor

[0058] 10: Sealed container

[0059] 10a: Intermediate housing

[0060] 12: Suction pipe

[0061] 14: Discharge pipe

[0062] 15: Injection pipe

[0063] 16: Sub-frame

[0064] 18: Oil sump

[0065] 19: Pump element

[0066] 20: Compression mechanism

[0067] 22: Fixed scroll member

[0068] 22a: Fixed scroll base plate

[0069] 22b: Fixed scroll spiral scroll

[0070] 24: Discharge port

[0071] 26: Moving scroll member

[0072] 26a: Moving scroll base plate

[0073] 26b: Moving scroll spiral scroll

[0074] 26c: Rotating bearing

[0075] 28: Compression chamber

[0076] 30: Motor element

[0077] 32: Electric motor stator

[0078] 32a: Opening

[0079] 34: Electric motor rotor

[0080] 36: Crankshaft

[0081] 36a: Main shaft portion

[0082] 36b: Eccentric shaft portion

[0083] 37: Glass terminal

[0084] 38: Coil

[0085] 39: Main bearing

[0086] 40: Welded portion

[0087] 50: Contact area

[0088] 52: Gap

Claims

1. A compressor (1), characterized in that, The compressor (1) includes: A cylindrical sealed container (10); A compression mechanism (20) that is accommodated in the sealed container (10) and configured to compress refrigerant gas; A motor element (30) that is accommodated in the sealed container (10) and drives the compression mechanism, the motor element (30) including an electric motor stator (32) that is fitted and welded to the sealed container (10); and A welding portion (40) that welds the sealed container (10) and the electric motor stator (32) together, wherein the compressor (1) includes a contact area (50) that is included in an outer edge portion of the electric motor stator (32) and the sealed container (10), in which the inner peripheral surface of the sealed container (10) and the electric motor stator (32) are in contact and fixed, and wherein the welding portion (40) is formed to extend from an outer surface of the sealed container (10) to the inside of the electric motor stator (32) in the contact area (50), wherein the number of the welding portions (40) is 4, and wherein the sealed container (10) and the electric motor stator (32) include a melted portion, and the welding portion (40) includes solidified melted metal filled in the melted portion, and the melted metal includes the following: the melted sealed container, the melted electric motor stator, and melted welding metal rods.

2. The compressor (1) according to claim 1, characterized in that, The compressor (1) further includes at least one gap (52) through which compressed gas flows between the inner peripheral surface of the sealed container (10) and the electric motor stator (32), and the at least one gap (52) is provided in an area other than the contact area (50).

3. The compressor (1) according to claim 1, characterized in that, The radius of curvature of the welding portion (40) on the electric motor stator side is smaller than the radius of curvature of both the sealed container (10) and the electric motor stator (32).

4. The compressor (1) according to claim 1, characterized in that, The welding portion (40) is directly formed by welding from the outer surface of the sealed container (10) to the inside of the electric motor stator (32) in the contact area (50).

Images