JPH1150981A - Closed type scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the number of parts and to reduce cost by welding a discharge cover on a main body by making a lower end of the discharge cover to limit a discharge chamber to an upper part of a closed housing contact with an outer peripheral edge of a fixed scroll of a scroll type compression mechanism. SOLUTION: A closed housing 8 has a cylindrical main body 8a and an upper part end plate 8b, and a discharge chamber 44 is limited to an upper part in the closed housing by welding a lower end surface of a discharge cover 31 on an outer peripheral surface of the main body 8a. A scroll type compression mechanism C furnished with a fixed scroll 1, a revolving scroll 2, a frame 6, etc., is built in this closed housing 8. In this case, at the time of fixing the fixed scroll 1 on the frame 6, a lower end of the discharge cover 31 is made contact with an outer peripheral edge of the fixed scroll 1, that is, an upper surface of a flange 14, and in a state where this is held between the upper surface of the flange 14 and the frame 6, the discharge cover 31 is welded on an upper end surface of the main body 8a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hermetic scroll compressor.

[0002]

2. Description of the Related Art An example of a conventional hermetic scroll compressor is shown in FIG. The sealed housing 8 has a cylindrical main body 8a.
And an upper head plate 8b covering the upper opening, and a lower head plate 8c covering the lower opening. By welding the lower end surface of the discharge cover 31 to the outer peripheral surface of the main body 8a, the discharge chamber 44 is limited at the upper part in the closed container 8, the lower end surface of the upper end plate 8b is welded to the outer peripheral surface of the discharge cover 31, and The lower end surface is welded to the outer peripheral surface of lower end plate 8c.

[0003] A scroll-type compression mechanism C and an electric motor M for driving the scroll-type compression mechanism C are incorporated in the hermetic housing 8, and are linked to each other via a rotary shaft 5. The electric motor M includes a rotor Ma and a stator Mb,
The rotor Ma is fixed to the rotary shaft 5, and the stator Mb is fixed to the main body 8a of the closed housing 8.

The scroll type compression mechanism C includes a fixed scroll 1, an orbiting scroll 2, a frame 6, and the like. The fixed scroll 1 includes an end plate 11 and a spiral wrap 12 erected on the inner surface of the end plate 11, and a discharge port 13 is formed in the center of the end plate 11.

The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21. A drive bush 54 is provided with a slewing bearing 73 in a boss 23 erected at the center of the outer surface of the end plate 21. And is rotatably inserted through the connector.

An eccentric pin 53 projecting from the upper end of the rotary shaft 5 is slidably fitted in a slide hole 55 formed in the drive bush 54. A plurality of closed spaces 24 are formed by eccentrically fixing the fixed scroll 1 and the orbiting scroll 2 to each other by a predetermined distance, and displacing the fixed scroll 1 and the orbiting scroll 2 by an angle of 180 degrees.

The frame 6 is fixed to the main body 8a of the sealed housing 8 by plug welding, and the orbiting scroll 2 is slidably supported on the frame 6. Between the orbiting scroll 2 and the frame 6, a rotation preventing mechanism 3 including an Oldham link or the like for allowing the orbiting scroll 2 to revolve and prevent the rotation is provided.

The fixed scroll 1 is fastened to the frame 6 by bolts 32 penetrating through a flange 14 formed on the outer periphery thereof. The relative positions of the fixed scroll 1 and the frame 6 are regulated by a plurality of positioning pins 33.

At the center of the outer surface of the end plate 11 of the fixed scroll 1, a cylindrical flange 16 projects upward, and a cylindrical projecting projection extends downward from the outer peripheral surface of the flange 16 and the lower surface of the discharge cover 31. O with the inner peripheral surface of the flange 38
A discharge cavity 42 is formed by tightly fitting through a ring 39, and a suction chamber 43 is formed outside the discharge cavity 42.

The upper end of the rotary shaft 5 is supported by an upper bearing 71 provided on the frame 6, and the lower end is supported by a lower bearing 72 provided on the stay 15. This stay 15 is plug-welded to the main body 8 a of the closed housing 8. Has been fixed by.

When the electric motor M is driven, the orbiting scroll 2 is driven via the rotary shaft 5, the eccentric pin 53, the drive bush 54, the orbit bearing 73 and the boss 23, and the orbiting scroll 2 is rotated by the anti-rotation mechanism 3. While being blocked, it revolves around a circular orbit having the radius of revolution.

Then, the gas flows through the suction pipe 82 to the frame 6.
And is sucked into the closed space 24 from the suction chamber 43 through a passage (not shown). Then, the closed space 24 is formed by the orbital movement of the orbiting scroll 2.
As the volume of the gas decreases, it reaches the center while being compressed, and then pushes open the discharge valve 47 from the discharge port 13 through the discharge cavity 42 and the discharge hole 46 to enter the discharge chamber 44, from which the discharge pipe It is discharged to the outside via 83.

Reference numeral 48 denotes a valve retainer, which includes a discharge valve 47 and a valve retainer.
One end of 48 is fixed to the outer surface of the discharge cover 31 by a bolt 49.

[0014]

In the above-described conventional hermetic scroll compressor, the fixed scroll 1 is fastened to the frame 6 by a plurality of bolts 32. Therefore, a plurality of bolt holes 34 are formed in the fixed scroll 1. In addition, the bolt holes 39 need to be formed in the frame 6 and the tightening torque of the plurality of bolts 32 must be controlled at the time of assembling, so that the number of parts and the number of assembling steps are increased, and the cost is increased. There was a problem of increasing.

[0015]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the first invention is to provide a main body and an upper end plate for covering an upper opening of the main body. In a hermetic scroll compressor in which a scroll-type compression mechanism and an electric motor are built in a lower portion thereof in a hermetically sealed housing and a frame of the scroll-type compression mechanism is fixed to the main body, a discharge chamber is provided in an upper portion of the hermetically sealed housing. The discharge cover or the upper head plate is attached to the main body with the lower end of the discharge cover or the upper head plate being in contact with the outer peripheral edge of the fixed scroll of the scroll type compression mechanism and sandwiched between the frame and the frame. A hermetic scroll compressor characterized by being welded.

Another feature is that the lower end of the discharge cover or the upper end plate is reduced in diameter by narrowing the lower end.

The gist of the second invention is that a scroll-type compression mechanism and an electric motor are built in a closed housing having a main body and an upper end plate covering an upper opening thereof, and the scroll-type compression mechanism is provided. In the hermetic scroll compressor in which the frame is fixed to the main body, a compression spring is provided between the discharge cover or the upper end plate and the fixed scroll of the scroll type compression mechanism which limit a discharge chamber in the upper part of the hermetic housing. The hermetic scroll compressor is characterized in that the fixed scroll is pressed and fixed to the frame by the compression spring.

The gist of the third invention is that a scroll type compression mechanism and an electric motor are built in a closed housing having a main body and an upper end plate covering an upper opening of the main body and the scroll type compression mechanism. In the hermetic scroll compressor in which the frame is fixed to the main body, the lower end of the upper end plate is brought into contact with the outer peripheral edge of the fixed scroll of the scroll compressor via a sealing material, and this is connected to the frame. The closed scroll compressor is characterized in that the upper head plate is welded to the main body while being sandwiched therebetween.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG. The discharge cover 31 is welded to the upper end surface of the main body 8a in a state where the lower end of the discharge cover 31 is brought into contact with the outer peripheral edge of the fixed scroll 1, that is, the upper surface of the flange 14 and is sandwiched between the frame 6 and the discharge cover 31. I have. The lower end surface of the upper head plate 8b is welded to the outer peripheral surface of the main body 8a.

Thus, the fixed scroll 1 is moved to the frame 6
A plurality of bolts 32 and bolt holes 34 for fastening to
39 is not required, so that the structure is simplified, and the number of parts, machining and assembling steps are reduced, so that the cost can be reduced.

Further, it is possible to prevent accidents due to loosening of the bolt 32 and uneven tightening torque thereof. Other configurations and operations are the same as those of the conventional one shown in FIG. 8, and corresponding members are denoted by the same reference numerals and description thereof will be omitted.

FIG. 2 shows a second embodiment of the present invention. In the second embodiment, the upper end plate 8b is welded to the upper end surface of the main body 8a in a state where the lower end of the upper end plate 8b is brought into contact with the outer peripheral edge of the fixed scroll 1 and is held between the fixed scroll 1 and the frame 6. ing.

The discharge chamber 44 is limited above the fixed scroll 1 by burying an O-ring 89 on the outer circumferential surface of the fixed scroll 1 and making the O-ring 89 closely contact the inner circumferential surface of the main body 8a. In addition, fixed scroll 1
The discharge valve 47 and one end of the valve retainer 48 are
And the discharge valve 47
Is opened and closed.

Thus, the discharge cover 31 can be omitted, and the plurality of bolts 32 and the bolt holes 34, 39 for fastening the fixed scroll 1 to the frame 6 are not required. Therefore, the structure is simplified, and the number of parts is reduced. Since the number of processing and assembly steps is reduced, the cost can be reduced.

Further, accidents due to loosening of the bolts 32 and uneven tightening torque can be prevented. Other configurations and operations are the same as those of the conventional one shown in FIG. 8, and corresponding members are denoted by the same reference numerals and description thereof will be omitted.

FIG. 3 shows a third embodiment of the present invention. In the third embodiment, the lower end is made smaller by narrowing the lower part of the discharge cover 31. Other configurations are the same as those of the first embodiment shown in FIG. 1, and corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Since the contact length between the outer peripheral surface of the discharge cover 31 and the inner peripheral surface of the main body 8a is shorter than that of the first embodiment, chatter noise is generated from this contact portion during operation of the compressor. Can be prevented.

A fourth embodiment of the present invention is shown in FIG. In the fourth embodiment, the lower end is made smaller by narrowing the lower part of the upper head plate 8b. The other configuration is the same as that of the second embodiment shown in FIG. 2, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Since the contact length between the outer peripheral surface of the upper head plate 8b and the inner peripheral surface of the main body 8a is shorter than that of the second embodiment, chattering noise is generated from this contact portion during operation of the compressor. Can be prevented.

Further, the contact position between the lower end of the upper end plate 8b and the fixed scroll 1 can be made farther from the O-ring 89 buried in the outer peripheral surface of the fixed scroll 1, so that the O-ring
Insufficient sealing due to deformation of the storage groove of 89 can be prevented.

A fifth embodiment of the present invention is shown in FIG. In the fifth embodiment, a compression spring is provided between the discharge cover 31 and the outer peripheral edge of the fixed scroll 1.
The fixed scroll 1 is pressed and fixed to the frame 6 by the compression spring 91.

Thus, the fixed scroll 1 is moved to the frame 6
The bolts 32 and the bolt holes 34 and 39 for fastening the bolts are not required, so that the structure is simplified and the number of parts, machining and assembling steps are reduced, so that the cost can be reduced.

Further, it is possible to prevent an accident due to loosening of the bolt 32 or uneven tightening torque thereof. Other configurations and operations are the same as those of the conventional one shown in FIG. 8, and corresponding members are denoted by the same reference numerals and description thereof is omitted.

A sixth embodiment of the present invention is shown in FIG. In the sixth embodiment, a compression spring 93 is interposed between a spring receiver 92 fixed to the upper end plate 8b and an outer peripheral edge of the fixed scroll 1, and the fixed scroll 1 is pressed against the frame 6 by the compression spring 93. It is fixed. And
Except that the lower end surface of the upper head plate 8b is welded to the outer peripheral surface of the main body 8a, other configurations are the same as those of the second embodiment shown in FIG. 2, and corresponding members are denoted by the same reference numerals. The description is omitted.

Thus, the fixed scroll 1 is moved to the frame 6
The bolts 32 and the bolt holes 34 and 39 for fastening the bolts are not required, so that the structure is simplified and the number of parts, machining and assembling steps are reduced, so that the cost can be reduced. Further, it is possible to prevent an accident due to loosening of the bolt 32 and irregularity of the tightening torque thereof.

A seventh embodiment of the present invention is shown in FIG. In the seventh embodiment, as shown in FIG. 7 (A), a plate-like sealing material 87 is interposed between the lower end of the upper end plate 8b and the upper surface of the flange 14 of the fixed scroll 1. As shown in FIG. 7 (B), the lower end is reduced in diameter by squeezing the lower part of the upper head plate 8b,
Alternatively, the O-ring 88 may be brought into contact with an O-ring 88 buried in the upper surface of the 14.

Since the discharge chamber 44 can be limited by sealing the gap between the fixed scroll 1 and the upper end plate 8b with the sealing material 87 or the O-ring 88, the discharge chamber 44 is embedded in the outer peripheral surface of the fixed scroll 1. O-ring
89 and its storage groove can be omitted.

Also, during operation of the compressor, fretting based on the lower end of the end plate 8b directly contacting the fixed scroll 1 can be prevented. Other configurations and operations are the same as those of the second embodiment shown in FIG. 2, and corresponding members are denoted by the same reference numerals and description thereof will be omitted.

[0039]

According to the first aspect of the present invention,
Since the lower end of the discharge cover or upper end plate that limits the discharge chamber in the upper part of the sealed housing is in contact with the outer peripheral edge of the fixed scroll and this is sandwiched between the frame and the discharge cover or the upper end plate is welded to the main body, Bolts for fastening the fixed scroll to the frame can be omitted, so that accidents due to loosening of the bolts and uneven tightening torque can be prevented, and the structure can be simplified, and the number of parts, machining and assembly man-hours can be reduced. , The cost can be reduced.

If the lower end of the discharge cover or the upper end plate is made smaller in diameter by squeezing the lower portion, the contact length between the outer peripheral surface of the discharge cover or the upper end plate and the inner peripheral surface of the main body is shortened. The chattering sound generated from this contact portion during can be suppressed.

According to the third aspect of the present invention, a compression spring is interposed between the fixed scroll and a discharge cover or an upper end plate which limits the discharge chamber in the upper portion of the closed housing, and the fixed scroll is fixed by the compression spring. Is fixed to the frame by pressing, so bolts for fastening the fixed scroll to the frame can be omitted,
Therefore, accidents due to loose bolts and irregular tightening torques can be prevented beforehand, the structure can be simplified, and the number of parts, machining and assembling steps can be reduced, so that costs can be reduced.

According to the third aspect of the present invention, the lower end of the upper end plate is brought into contact with the outer peripheral edge of the fixed scroll of the scroll compressor via a sealing material, and this is sandwiched between the frame and the frame. Because the upper end plate was welded to the body in
The discharge chamber can be easily formed at the upper part in the closed housing without attaching the discharge cover, and fretting based on the lower end of the upper end plate directly contacting the fixed scroll can be prevented.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional view of a hermetic scroll compressor showing a first embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional view of a hermetic scroll compressor showing a second embodiment of the present invention.

FIG. 3 is a partial vertical sectional view of a hermetic scroll compressor showing a third embodiment of the present invention.

FIG. 4 is a partial longitudinal sectional view of a hermetic scroll compressor showing a fourth embodiment of the present invention.

FIG. 5 is a partial vertical sectional view of a hermetic scroll compressor showing a fifth embodiment of the present invention.

FIG. 6 is a partial longitudinal sectional view of a hermetic scroll compressor showing a sixth embodiment of the present invention.

FIG. 7 shows a seventh embodiment of the present invention, wherein (A) and (B)
1 is a partial vertical sectional view of a hermetic scroll compressor.

FIG. 8 is a longitudinal sectional view of a conventional hermetic scroll compressor.

[Explanation of symbols]

 8 Closed housing 8a Main body 8b Upper head 8c Lower head C Scroll type compression mechanism 1 Fixed scroll 2 Orbiting scroll 6 Frame M Electric motor 5 Rotary shaft 31 Discharge cover 44 Discharge chamber

Claims (4)

[Claims] 1. A scroll type compression mechanism and an electric motor are built in a closed housing having a main body and an upper end plate covering an upper opening thereof, and a frame of the scroll type compression mechanism is fixed to the main body. In the hermetic scroll compressor, the lower end of the discharge cover or the upper end plate that limits the discharge chamber in the upper portion of the hermetic housing is brought into contact with the outer peripheral edge of the fixed scroll of the scroll type compression mechanism, and this is brought into contact with the frame. The hermetic scroll compressor wherein the discharge cover or the upper head plate is welded to the main body while being sandwiched therebetween. 2. The hermetic scroll compressor according to claim 1, wherein the lower end of the discharge cover or the upper end plate is made smaller by squeezing the lower part thereof. 3. A scroll type compression mechanism and an electric motor are built in a closed housing having a main body and an upper end plate covering an upper opening thereof, and a frame of the scroll type compression mechanism is fixed to the main body. In the hermetic scroll compressor, a compression spring is interposed between the discharge cover or the upper end plate that limits the discharge chamber in the upper part of the hermetic housing and the fixed scroll of the scroll type compression mechanism, and the compression spring forms A hermetic scroll compressor wherein a fixed scroll is pressed and fixed to the frame. 4. A scroll type compression mechanism and an electric motor are incorporated in a closed housing having a main body and an upper end plate covering an upper opening thereof, and a frame of the scroll type compression mechanism is fixed to the main body. In the hermetic scroll compressor, the lower end of the upper end plate is brought into contact with an outer peripheral edge of a fixed scroll of the scroll type compressor via a sealing material, and the upper end plate is sandwiched between the upper end plate and the frame. Is hermetically sealed to the main body.