JPH0712077A - Closed type compressor and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a clased type compressor having high operational reliability by sureby preventing extremely small sputter from entering a compression mechanism part, and preventing damade of a slidingly movable part by the sputter. CONSTITUTION:An electric motor 6 and a pump 7 are housed in a sealed container 2. In a closed type compressor which is composed of a cylindrical case 3 to which the pump 7 connected directly to the electric motor 6 in the case 3 is fixed at intervals by plural spot weldings and cover bodies 4 to block up both ends of this case 3 and constitutes the sealed container 2 by welding both together after the cover bodies 4 are superposed on both end side surfaces of the case 3, O-rings 8 are arranged above and below the spot welding parts between the cylindrical case 3 and the pump 7, and the O-rings 8 are arranged in the superposed parts between the case 3 and the cover bodies 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used for a refrigerating machine and a method of manufacturing the hermetic compressor, and more particularly, to a locking weld between a compression mechanism portion and a hermetic container and a plurality of steel plate elements. The present invention relates to a welding method for preventing the invasion of the spatter into the compressor constituent part caused by the sealing welding of the closed container.

[0002]

2. Description of the Related Art As an example of the structure of a conventional hermetic compressor, the one disclosed in Japanese Patent Laid-Open No. 3-179192 is known. A method for assembling such a hermetic compressor will be described with reference to FIGS. 2 and 3. FIG. 2 is a vertical cross-sectional view showing an example of a welding structure of a conventional hermetic compressor, and FIG. 3 is a plan view showing a minute gap generated by sealing welding of a container of the conventional hermetic compressor.

In FIG. 2, 11 is a closed container and 12 is
A cylindrical case (hereinafter simply referred to as a case) forming a closed container, 13 a lid forming the closed container, 14 an overlapping portion of the case 12 and the cover 13, 15 an electric motor, 16 a precision machined component Compression mechanism part (hereinafter called pump),
Reference numeral 17 is a droplet, that is, a spatter generated during electric welding.

[0004] After the case 12 and the electric motor 15 have been joined by shrink fitting or the like in advance, the pump 16 has a rotor 15b outer diameter of the electric motor 15 directly connected to the pump 16 and a stator 15a.
While maintaining the air gap 15c between the inner diameter and the inner diameter, the case 12 and a part of the pump 16 are fixed by spot welding at a plurality of points from the outside of the case 12. In this case, for the purpose of adjusting the air gap 15c described above, a gap is provided between the case 12 and the pump 16 so as to avoid interference between the two. After that, the lids 13 are superposed on both side surfaces of the case 12, and then both end surfaces 12a of the case 12 and the lid 13 are electrically welded to complete the assembly.

[0005]

In the conventional welding method for the hermetic compressor described above, since the gap is formed between the case 12 and the pump 16 as described above, a consumable electrode or the like is used. Spatters 17 generated during electric welding of the both fall into the closed container 12. Further, as shown in FIG. 3, the case 12 and the lid 13 have spatter 17 generated near the end of the circumferential welding of the overlapping portion 14 from the gap 14a generated by the release of the plastic forming residual stress between the case 12 and the lid 13. Closed container 1
Drop into 2.

As a result, the sputter 17 is pumped by the pump 16.
There was a problem in that a smooth accident is impeded by intrusion of lubricating oil into the clearance of a narrow sliding part (not shown) together with the lubricating oil, causing a lock accident or seizure failure due to biting.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and reliably prevents the intrusion of minute spatters into the compression mechanism section and prevents the sliding section from being damaged by spatters. It is an object of the present invention to provide a hermetic compressor having high operation reliability and a method for manufacturing the hermetic compressor.

[0008]

In order to achieve the above object, a hermetic compressor according to the present invention has a structure in which a motor and a compression mechanism are housed in a hermetic container, and the motor is housed in a case. A cylindrical case in which the fixing portion of the compression mechanism portion directly connected to the cylindrical body case is fixed by a plurality of spot weldings with a gap, and a lid body that closes both ends of the cylindrical body case, and the lid body is provided on both side surfaces of the cylindrical body case. In a hermetic compressor in which the two are polymerized and welded together to form a hermetic container, O is provided above and below a spot welding portion between the cylindrical case and the fixing portion of the compression mechanism portion.
A ring is provided, and an O-ring is provided at the overlapping portion between the cylindrical case and the lid.

In order to achieve the above object, the structure of the method for manufacturing a hermetic compressor according to the present invention is one in which an electric motor and a compression mechanism are housed in a hermetic container, and a cylinder forming the hermetic container. The body case and the lid are manufactured by plastic forming of a steel plate, and the fixing portion of the compression mechanism portion directly connected to the electric motor is fixed in the cylindrical case by a plurality of spot weldings with a gap, and then both ends of the cylindrical body case are fixed. In a method for manufacturing a hermetic compressor in which the lid body is overlapped on a side surface and both are sealed by welding, a circumferential groove is formed in upper and lower two stages on an outer periphery of a fixed portion of the compression mechanism portion, and the lid body is formed. A circumferential groove is formed on the outer periphery corresponding to the overlapping portion with the cylindrical case, and an O-ring is fitted in each of these circumferential grooves in advance, and the O-ring 8 is formed based on the inner diameter of the stator of the electric motor. The fixed part of the compression mechanism part fitted with With the outer diameter of the rotor and the inner diameter of the stator temporarily locked so that an appropriate gap is maintained, the cylindrical case and the fixing portion of the compression mechanism section are provided at a plurality of points from the outside of the cylindrical case. The lid body is fixed by attachment welding, and then the lid body fitted with the O-ring is superposed on both side surfaces of the cylindrical body case, and sealed and welded.

[0010]

The function of the above technical means is as follows. In order to seal spatter generated by electric welding, in the present invention, elastic O-rings are provided above and below a spot welding portion between a cylindrical case having a welding structure having a gap and a fixing portion of a compression mechanism portion. Is installed over the entire circumference of the gap, and an elastic body O-ring is installed over the entire circumference of the outer circumference of the lid, which is the overlapping portion between the cylindrical case and the lid, whereby the respective gaps can be sealed. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a longitudinal sectional view showing an example of a welded structure of a hermetic compressor according to an embodiment of the present invention. In FIG.
1 is a hermetic compressor, 2 is a hermetic container, 3 is a cylindrical body case (hereinafter simply referred to as a case) that constitutes the hermetic container, and 4 is
A lid constituting a closed container, 5 an overlapping portion of the case 3 and the lid 4, 6 an electric motor, 7 a compression mechanism portion (hereinafter referred to as a pump) made of precision processed parts, 8 an elastic material such as rubber The O-ring 9 formed by the body is a droplet or spatter generated during electric welding.

That is, the hermetic compressor 1 includes a hermetic container 2
The electric motor 6 is arranged in the upper part of the inside, the pump 7 is arranged in the lower part, and the lid body 4 is overlapped on both sides of the case 3 to basically configure. A gap is previously formed between the case 3 and the pump 7 in order to appropriately adjust the gap of the air gap 6c formed by the rotor 6a and the stator 6b of the electric motor 6. Here, a circumferential groove 7a is formed on the outer periphery of the fixed portion (for example, a cylinder) of the pump 7 so as to extend vertically in two steps. Further, a single circumferential groove 4a is formed on the outer periphery of the lid 4 at a portion corresponding to the overlapping portion 5.

The procedure for assembling the hermetic compressor 1 will be described. The stator 6b of the electric motor 6 is joined to the case 3 in advance by shrink fitting or the like. Next, with reference to the inner diameter of the stator 6b, the pump 7 having the O-ring 8 fitted in the circumferential groove 7a has the outer diameter of the rotor 6a directly connected to the upper portion of the pump 7 and the inner diameter of the stator 6b. Is temporarily locked so as to maintain an appropriate air gap 6c. In this temporarily locked state, the case 3 and the fixed portion (for example, the outer circumference of the cylinder) of the pump 7 are electrically welded from the outside of the case 3 by using, for example, a consumable electrode, and a plurality of spot electric weldings are performed. Fixed by.

Next, the lid 4 having the O-ring 8 fitted in the circumferential groove 4a is overlapped with both side surfaces of the case 3, and the end surface 3a of the case 3 and a part of the overlap portion 5 of the lid 3 are electrically welded. Sealing welding is performed, and the assembly of the hermetic compressor 1 is completed. At this time,
Since the O-ring 8 is formed of an elastic material such as rubber,
While sealing the gap between the case 3 and the pump 7,
The lid 4 side is configured to follow the minute gap generated at the end point of the welding by circumferential welding and seal the gap between the case 3 and the lid 4.

According to this embodiment, the spatter 9 generated by the electric welding is generated between the two-stage O-rings 8 provided on the upper and lower sides of the pump 7, the end face 3a of the case 3 and the end face 4b of the lid 4. Since it is completely sealed between the
Does not fall into the closed container 2, and therefore the spatter 9 can be prevented from entering the sliding portion of the pump 7, and damage to the sliding portion (not shown) such as biting or seizure can be avoided. It is possible to provide a hermetic compressor with extremely high operational reliability.

[0016]

As described in detail above, according to the present invention, it is possible to reliably prevent the intrusion of minute spatter into the compression mechanism portion and prevent the sliding portion from being damaged by spatter, thereby improving the operational reliability. It is possible to provide a hermetic compressor having a high temperature and a method for manufacturing the same.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a welded structure of a hermetic compressor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an example of a welding structure of a conventional hermetic compressor.

FIG. 3 is a plan view showing a minute gap generated by sealing welding of a container of a conventional hermetic compressor.

[Explanation of symbols]

 2 Airtight container 3 Case 4 Lid body 5 Overlapping part 6 Electric motor 7 Pump 4a, 7a Circumferential groove 8 O-ring

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Shimoyama 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture

Claims (2)

[Claims] 1. A cylindrical case in which an electric motor and a compression mechanism are housed in a closed container, and a fixing part of the compression mechanism directly connected to the electric motor is fixed in the case by a plurality of spot weldings with a gap. In a hermetic compressor that comprises a lid that closes both ends of the cylindrical case, the lid is polymerized on both end side surfaces of the cylindrical case, and both are welded to form a hermetic container, wherein the cylindrical case A hermetic compressor, wherein O-rings are provided above and below a spot welding portion with the fixed portion of the compression mechanism portion, and an O-ring is provided at an overlapping portion between the cylindrical body case and the lid. 2. An electric motor and a compression mechanism are housed in a hermetic container, and a cylindrical case and a lid constituting the hermetic container are manufactured by plastic forming of a steel plate, and the electric motor is installed in the cylindrical case. In the method for manufacturing a hermetic compressor, after fixing the fixing portion of the compression mechanism portion directly connected by a plurality of spot welding with a gap, the lid body is superposed on both end side surfaces of the cylindrical body case and both are sealed by welding. , A circumferential groove is formed on the outer circumference of the fixed portion of the compression mechanism portion in two steps, and a circumferential groove is formed on the outer circumference corresponding to the overlapping portion of the lid body with the cylindrical body case. An O-ring is fitted in the circumferential groove in advance, and the fixed part of the compression mechanism part fitted with the O-ring 8 is based on the inner diameter of the stator of the electric motor. In the state where it is temporarily locked so as to maintain an appropriate gap with the inner diameter of the stator The cylindrical case and the fixing portion of the compression mechanism section are fixed to each other from the outside of the cylindrical case by a plurality of spot weldings, and then the lids fitted with the O-rings are attached to both side surfaces of the cylindrical case. A method for manufacturing a hermetic compressor, comprising: