JPH08219056A - Discharge valve mechanism in compressor and manufacture thereof - Google Patents

Abstract

PURPOSE: To reduce manufacturing cost through the correct and simple formation of a valve seat for seating the valve part of a plate valve at the time of forming a compression element of casting for contamination control in the case of using refrigerant unconformable to lubricating oil in order to substitute for fleon. CONSTITUTION: A compression element 1 is formed of casting, and a cylinder body 5 having a collar-like valve seat 51 for seating the valve part 41 of a plate valve 4 is inserted and fixed into a discharge hole 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge valve mechanism of a compressor mainly used in a refrigeration system and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, a discharge valve mechanism of a compressor is disclosed in, for example, Japanese Patent Laid-Open No. 6-2681 and, as shown in FIG. 7, a discharge head communicating with a cylinder head A of a compression element and a cylinder chamber. A hole A1 is provided, and on the open side of the discharge hole A1,
A cantilever type plate valve B having a valve portion B1 covering the discharge hole A1 and a mounting portion B2 to the cylinder head A, and a valve retainer C for restricting the full lift amount of the plate valve B are fixed via a fixing bolt D. Attached in a cantilevered manner.

Further, the cylinder head A is mainly manufactured by sintering means, and a valve seat A2 on which the valve portion B1 of the plate valve B is seated is integrally formed on the opening side of the discharge hole A1 thereof. The valve seat A2 has a plane annular shape and has a semicircular arc-shaped cross section that bulges outward in the gas discharge direction of the discharge hole A1. The reason for adopting such a shape is that when the plate valve B is closed after the gas compressed in the cylinder chamber is discharged from the discharge hole A1, the valve portion B1 is in line contact with the valve seat A2. In combination with the sealing effect of the lubricating oil, the once discharged gas is prevented from flowing backward to the discharge hole A1 side to enhance the airtightness in the cylinder chamber, and the compression in the cylinder chamber is performed. When gas is discharged from the discharge hole A1 and the plate valve B starts the opening operation, the valve portion B1 is viscous in oil and the valve seat A2.
This is to prevent the plate valve B from being delayed in opening and causing excessive compression in the cylinder chamber.

By the way, when the cylinder head A is formed by sintering means as in the prior art, the cylinder head A is
While the valve seat A2 can be formed accurately and easily at the same time, without the need for cutting, etc., a large amount of dust such as material powder (contamination) is generated in the sintering means, which adversely affects the lubrication performance. In the alternative chlorofluorocarbon, it is preferable that the cylinder head A is made of a casting that does not generate dust, except for the sintering means, in terms of contamination control.

[0005]

However, when the cylinder head A is manufactured by casting, it is useful for contamination control because it produces less dust, but on the other hand, precision is difficult to obtain with casting, It is necessary to cut the valve seat A2 with a cutter or the like so as to finish it into the above-described semi-circular cross section so that the plate valve B can be accurately seated on the valve seat A2, and therefore it takes time to manufacture. There was a problem that the manufacturing cost was high.

It is an object of the present invention to use a refrigerant that is not compatible with a lubricating oil for forming a CFC substitute, and when a compression element is formed by casting for contamination control, a valve seat on which a plate valve is seated accurately is formed. In addition, it is easy to form and the manufacturing cost can be reduced.

[0007]

In order to achieve the above object, in the first invention of claim 1, a discharge hole 3 extending from the cylinder chamber 2 is opened in the compression element 1, and the discharge hole 3 is provided on the open side. In a discharge valve mechanism in a compressor provided with a cantilever type plate valve 4 having a valve portion 41 covering the discharge hole 3 and a mounting portion 42 for the compression element 1, the compression element 1 is formed of casting, and A tubular body 5 having a flange-shaped valve seat 51 on which the valve portion 41 is seated is inserted and fixed in the discharge hole 3.

According to the second aspect of the present invention, the recess 6 is provided at the opening end of the discharge hole 3 on the cylinder chamber side, and the crimp portion 52 that is folded back to the recess 6 is provided at the insertion tip side of the tubular body 5.

In the third aspect, the plane of the insertion leading edge in the inserted state of the cylindrical body 5 is finished to be flush with the wall surface of the cylinder chamber 2.

In the fourth aspect, the discharge hole 3 is opened radially outward of the cylinder chamber 2.

In the present invention, the discharge hole 3 is an elliptical hole whose minor axis is aligned with the circumferential direction of the cylinder chamber 2, and the tubular body 5 is an elliptic cylinder corresponding to the discharge hole 3.

In the method for manufacturing the discharge valve mechanism according to the second aspect of the present invention, the discharge hole 3 opened in the compression element 1 made of casting.
And a flange-shaped valve seat 51 for seating the valve portion 41 of the plate valve 4.
The first step of inserting and fixing the tubular body 5 having the
After the step, there is provided a second step in which the wall surface of the cylinder chamber 2 in the compression element 1 and the flat surface of the insertion leading edge of the cylindrical body 5 are finished to be the same surface by polishing.

According to a seventh aspect of the present invention, the fixing means for fixing the tubular body 5 to the discharge hole 3 in the first step inserts the tubular body 5 into the recess 6 provided at the opening end of the discharge hole 3 on the cylinder chamber side. The caulking means for folding back the tip side is used.

[0014]

According to the first aspect of the present invention, since the compression element 1 is formed by casting, it is convenient in terms of contamination management, and it can be optimally used when using a CFC substitute refrigerant, while the valve seat is used. By inserting and fixing the tubular body 5 provided with 51 into the discharge hole 3 of the compression element 1, the valve seat 51 on which the valve portion 41 of the plate valve 4 is seated can be installed without requiring a troublesome finishing process. It can be formed accurately and easily on the open side of the discharge hole 3, and the manufacturing cost can be reduced.

According to the second aspect, the cylindrical body 5 is provided in the discharge hole 3.
Is inserted, and the caulking portion 52 provided on the insertion tip side.
By folding back at the recess 6 provided at the opening end of the discharge hole 3 on the cylinder chamber side, the cylinder body 5 can be easily attached to the discharge hole 3 using caulking means.

According to the third aspect of the present invention, the plane of the insertion leading edge of the cylindrical body 5 is finished to be flush with the wall surface of the cylinder chamber 2. It is possible to obtain a good efficiency by reducing the dead volume in the cylinder chamber 2 without forming a large space.

According to the fourth aspect, since the discharge hole 3 is opened radially outward of the cylinder chamber 2, that is, has a side discharge structure, the high pressure gas compressed in the cylinder chamber 2 can be smoothly discharged. Can be externally discharged to
Even in such a side discharge structure, the valve seat 51 can be accurately and easily formed by using the cylindrical body 5.

According to the fifth aspect, the discharge hole 3 is an elliptical hole having its minor axis aligned with the circumferential direction of the cylinder chamber 2,
Moreover, since the cylindrical body 5 is an elliptic cylinder corresponding to the discharge hole 3, the high pressure gas compressed in the cylinder chamber 2 is discharged all at once at a predetermined roller rotation angle, and the high pressure gas is discharged. After that, the dead volume of the cylinder chamber 2 can be reduced, and the overcompression of this high-pressure gas can be reduced.

According to the second aspect of the present invention, the cylindrical body 5 can be easily attached to the discharge hole 3 by the first and second steps to form an accurate valve seat 51. Even when distortion or the like may occur on the insertion tip side of the cylinder 5 when the cylinder 5 is inserted and fixed in the discharge hole 3, the distortion or the like is easily removed by the finishing process by polishing in the second step. Thus, the insertion tip side of the cylindrical body 5 and the wall surface of the cylinder chamber 2 can be made flush with each other.
Good efficiency can be obtained by reducing the dead volume in the cylinder chamber 2.

According to a seventh aspect, as a fixing means for fixing the tubular body 5 to the discharge hole 3 in the first step, a recess is provided at the tip end side of the tubular body 5 at the opening end of the discharge hole 3 on the cylinder chamber side. 6
Since the caulking means which is inserted in the valve and folded back is adopted, the cylinder body 5 can be easily attached to the discharge hole 3 and an accurate valve seat 5 can be obtained.
1 can be formed.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a vertical type rotary compressor for a refrigerator equipped with a discharge valve mechanism according to the present invention. A compression element 1 driven by a shaft 80 is provided.
The compression element 1 is provided with a cylinder 1A having a cylinder chamber 2 therein, and front and rear heads 1B and 1C which are opposed to the upper and lower parts of the cylinder 1A, and the cylinder chamber 1 has an eccentric shaft portion of a drive shaft 80. Roller 1D inserted in 81
By internally rotating the roller 1D in the cylinder chamber 1, the low pressure gas sucked into the cylinder chamber 1 from the suction pipe 71 is compressed, and the compressed high pressure gas is opened in the front head 1B. The discharge pipe 3 is discharged from the discharge hole 3 through the muffler 1E into the closed casing 7.
I take it out from 2.

The discharge valve mechanism provided at the outlet of the discharge hole 3 has a valve portion 41 covering the discharge hole 3 on one side and the front head 1B on the other side, as is apparent from FIGS. 2 and 3. Is provided with a plate valve 4 having a mounting portion 42 and a valve retainer 43 for restricting the full lift amount of the plate valve 4, both of which are cantilevered on the upper side of the front head 1B via a fixing bolt 44. ing. A valve chamber 10 is formed on the upper surface side of the front head 1B so that the discharge hole 3 is opened in the valve chamber 10 and the plate valve 4 and the valve retainer 43 are arranged. .

In the above construction, as is clear from FIG. 3, the entire compression element 1 is made of casting for contamination control, and the cylinder 5 is inserted and fixed in the discharge hole 3 of the front head 1B. Then, on the upper side of the tubular body 5 facing the valve portion 41, the valve portion 4 that projects radially outward of the discharge hole 3 in a flange shape and has a semicircular arc shape in cross section.
The valve seat 51 on which the seat 1 is seated is integrally formed.

A caulking portion 5 is provided on the lower side of the cylindrical body 5.
2 is formed, and a recess 6 is provided around the discharge hole 3 on the lower surface side of the front head 1B, and the caulking portion 52 is folded back in the recess 6, and the folding back portion and the valve seat 51 are combined. By sandwiching the front head 1B, the tubular body 6 is integrally caulked to the front head 1B.

In the above discharge valve mechanism, since the entire compression element 1 is made of cast metal, when the alternative CFC refrigerant is used, the cylinder 5 is discharged through the discharge hole while maintaining good contamination control. 3 is inserted from above and the caulking portion 52 is folded back at the recess 6 to be caulked,
The tubular body 5 can be easily caulked to the discharge hole 3, and by virtue of the caulking, the valve portion 41 can be provided without requiring a complicated finishing process as in the conventional case.
The valve seat 51 on which the seat is seated can be formed accurately and easily.

Further, as shown in FIG. 4, when the caulking portion 52 of the cylindrical body 5 is folded back in the recess 6, a part of the lower surface side of the folded back portion bulges from the lower wall surface of the front head 1B. In addition, the caulking portion 52 is formed thick in advance, or the recess 6 is formed to have a shallow depth with respect to the folded-back portion so that a part of the lower surface side of the folded-back portion bulges from the head lower wall surface. Then, after the swaged portion 52 is folded back, the swollen surface of the swaged portion 52 and the front head 1
By polishing a part of the wall surface on the lower side of B to the position indicated by the imaginary line a in the figure with an end mill or the like,
The caulking portion 52 may be finished so as to be flush with the upper side wall surface of the cylinder chamber 2.

With the above structure, as will be described later in a manufacturing method, when the cylinder body 5 is inserted into the discharge hole 3 and is caulked, the caulking portion 52 and the front head 1B side are distorted. However, even if this occurs, it is possible to easily remove this distortion by finishing processing with the end mill or the like, and to make the caulking portion 52 and the upper side wall surface of the cylinder chamber 2 flush with each other. Good efficiency can be obtained by reducing the dead volume in the cylinder chamber 2. That is, as shown in FIG.
2 is folded back in the recess 6 and is caulked, the caulking portion 52 is prevented from protruding to the lower surface side of the front head 1B to perform a secure caulking. 6 is formed to be large, around the caulking portion 6 in the recess 6, the cylinder chamber 2
Although a large dead volume S is generated between the upper side wall surface and the upper side wall surface, the generation of this dead volume S can be reduced in the case of FIG. In addition, since the lower surface side of the front head 1B facing the cylinder chamber 2 is usually subjected to a polishing process when the compression element 1 is assembled, at this time, by performing the finishing process continuously, The production man-hours do not increase.

When mounting the cylinder 5 in the discharge hole 3, press fitting or welding means can be used in addition to the above-described caulking preventing means. In the case of using such welding means, etc. In addition, even if the cylindrical body 5 or the front head 1B is distorted, the distortion can be easily removed by performing the finishing process as described above.

Further, in the above embodiment, the case where the discharge hole 3 is opened in the front head 1B and the high pressure gas in the cylinder chamber 2 is discharged upward has been described.
In the present invention, the discharge hole 3 is formed in the outer peripheral wall portion of the cylinder 1A so as to extend in the radial direction so as to penetrate the cylinder chamber 2
It can also be applied to a so-called side discharge structure in which the high pressure gas therein is discharged from the discharge hole 3 in the radial direction.

That is, as shown in FIG. 5, the cylinder 1
The blade 1 which is always in contact with the roller 1D at the outer peripheral wall of A
The high pressure gas in the cylinder chamber 2 defined by the blade 1F by the opening operation of the plate valve 4 provided on the opening side of the discharge hole 3 by penetrating the discharge hole 3 in the radial direction near F Of the valve seat 51 on which the plate valve 4 is seated and the caulking portion 5 in the discharge hole 3.
The cylindrical body 5 having 2 and 2 is attached. Even at this time, the discharge hole 3 on the cylinder chamber side of the cylinder 1A is also provided.
A recess 6 is provided around the recess 6 and the caulking portion 52 is provided in the recess 6.
It is preferable to turn back and crimp.

Further, the discharge hole 3 is an elliptical hole, and the short axis thereof coincides with the circumferential direction of the cylinder chamber 2 and the long axis thereof coincides with a straight line in the vertical direction orthogonal to the circumferential direction of the cylinder chamber 2. As described above, the cylinder 1A is formed in a penetrating manner, and
As shown in FIG. 6, it is preferable that the tubular body 5 is formed in an elliptic tubular shape corresponding to the ejection hole 3.

When the side discharge structure as described above is used, the high pressure gas compressed in the cylinder chamber 2 can be discharged smoothly to the outside with less resistance. By using it, the valve seat 51 can be formed accurately and easily,
Moreover, by mounting the discharge hole 3 as an elliptical hole as described above and by making the tubular body 5 into an elliptic tubular shape, the high pressure gas compressed in the cylinder chamber 2 is swept at a predetermined roller rotation angle. After that, the dead volume of the cylinder chamber 2 after the high pressure gas is discharged can be reduced, and the overcompression of this high pressure gas can be reduced.

That is, in the above side discharge structure, when the discharge holes 3 are formed in a circular shape having the same volume and the discharge holes 3 are formed in the cylinder 1A as shown by the phantom line in FIG. The edge portion b of the hole 3 is the blade 1
Since the roller 1D is largely separated from the roller F in the rotational direction of the roller 1D, after the high pressure gas compressed in the cylinder chamber 2 is discharged from the discharge hole 3, the cylinder chamber 2
While the dead volume when the high-pressure gas remaining in the cylinder chamber 2 is over-compressed becomes large, the space surrounded by the imaginary line in FIG.
A high pressure gas compressed in the cylinder chamber 2 is formed by using the discharge hole 3 as an elliptical hole with its short axis aligned with the circumferential direction of the cylinder chamber 2 and mounting the cylinder body 5 in an elliptical cylinder shape. Can be discharged all at once through the inside of the cylindrical body 5 at a predetermined roller rotation angle, and the dead volume of the cylinder chamber 2 after the high-pressure gas is discharged can be reduced to prevent overcompression of this high-pressure gas. It can be reduced.

The above discharge valve structure is manufactured by the following manufacturing method. That is, the first step of inserting and fixing the tubular body 5 having the valve seat 51 into the discharge hole 3 formed in the cylinder 1A or the front head 1B of the compression element 1 made of casting, and the first step is completed. After that, the cylinder chamber 2 of the cylinder 1A or the side wall surface of the cylinder chamber of the front head 1B and the flat end portion of the cylindrical body 5 that is inserted into the cylinder chamber side are finished by polishing in a second step. To be done.

Further, the fixing means of the cylindrical body 5 to the discharge hole 3 in the first step is such that the cylindrical body 5 is inserted into the discharge hole 3,
It is preferable that the caulking portion 52 is a caulking means that is folded back at the recess 6 formed in the cylinder 1A or the front head 1B.

According to the above-described manufacturing method, the cylindrical body 5 according to the first step can be formed by easily attaching the cylindrical body 5 to the discharge hole 3 by the first and second steps to form the accurate valve seat 51. 5 is fixed to the discharge hole 3 by caulking
Even if distortion occurs in the caulking portion 52, etc., the caulking portion 52 of the tubular body 5 can be easily removed by finishing processing by polishing in the second step, as described in FIG. And the wall surface of the cylinder chamber 2 can be made flush with each other, so that the dead volume in the cylinder chamber 2 can be reduced and good efficiency can be obtained. Moreover, by adopting the caulking means as the means for fixing the tubular body 5 to the ejection hole 3 in the first step, the tubular body 5 can be easily attached to the ejection hole 3 and an accurate valve seat 51 can be formed. .

[0037]

As described above, according to the first aspect of the present invention, by forming the compression element 1 by casting, it becomes convenient in terms of contamination management, and is used as a lubricating oil for the replacement of Freon. Optimum use is possible when using a refrigerant that is not very compatible, but a troublesome finishing process is separately required by inserting and fixing the cylinder body 5 having the valve seat 51 into the discharge hole 3 of the compression element 1. Without the valve portion 4 of the plate valve 4
The valve seat 51 on which the seat 1 is seated can be accurately and easily formed on the opening side of the discharge hole 3, and the manufacturing cost can be reduced.

According to the second aspect, the recess 6 is formed at the opening end of the discharge hole 3 on the cylinder chamber side, and the caulking portion 52 which is folded back to the recess 6 is provided at the insertion tip side of the tubular body 5. Therefore, the cylindrical body 5 can be easily attached to the discharge hole 3 by using the caulking means.

According to the third aspect of the present invention, since the plane of the insertion leading edge of the cylindrical body 5 is finished to be flush with the wall surface of the cylinder chamber 2, the extra wall is provided on the wall surface side of the cylinder chamber 2 of the cylindrical body 5. The dead volume in the cylinder chamber 2 can be reduced and good efficiency can be obtained without forming a space.

According to the fourth aspect, since the discharge hole 3 has a side discharge structure in which it is opened radially outward of the cylinder chamber 2, the high pressure gas compressed in the cylinder chamber 2 is smoothly discharged to the outside. Moreover, even in such a side discharge structure, the valve seat 51 can be accurately and easily formed by using the above-mentioned tubular body 5.

According to the fifth aspect, the discharge hole 3 is an elliptical hole whose minor axis is aligned with the circumferential direction of the cylinder chamber 2, and
Since the cylindrical body 5 is an elliptic cylinder corresponding to the discharge hole 3, the high pressure gas compressed in the cylinder chamber 2 is discharged at once at a predetermined roller rotation angle, and the cylinder chamber 2 after the high pressure gas is discharged. The dead volume of the gas can be reduced, and the overcompression of this high-pressure gas can be reduced.

According to the second aspect of the present invention, the cylindrical body 5 can be easily attached to the discharge hole 3 by the first and second steps to form an accurate valve seat 51, while the first step is used. Even if a distortion may occur at the insertion tip side of the cylinder 5 when the cylinder 5 is inserted and fixed in the discharge hole 3, the distortion can be easily removed by the finishing process by polishing in the second step. The insertion end side of the cylindrical body 5 and the wall surface of the cylinder chamber 2 can be made flush with each other, so that the dead volume in the cylinder chamber 2 can be reduced and good efficiency can be obtained.

According to the seventh aspect, as a means for fixing the tubular body 5 to the discharge hole 3 in the first step, a concave portion is provided in which the tip end side of the tubular body 5 is provided at the opening end of the discharge hole 3 on the cylinder chamber side. Since the caulking means that is inserted into the place 6 and folded back is adopted, the cylindrical body 5 can be easily attached to the discharge hole 3 to form an accurate valve seat 51.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the overall structure of a compressor provided with a discharge valve mechanism of the present invention.

FIG. 2 is a plan view of a main part.

FIG. 3 is an enlarged cross-sectional view taken along line XX of FIG.

FIG. 4 is a sectional view showing another embodiment.

FIG. 5 is a plan sectional view showing another embodiment of the present invention.

FIG. 6 is a front view of a cylindrical body used in the example.

FIG. 7 is a side sectional view showing a conventional discharge valve mechanism.

[Explanation of symbols]

 1 ... Compression element 2 ... Cylinder chamber 3 ... Discharge hole 4 ... Plate valve 41 ... Valve part 42 ... Mounting part 5 ... Cylindrical body 51 ... Valve seat 52 ... Caulking part 6 ... Recess

Claims (7)

[Claims] 1. A compression element (1) is provided with a discharge hole (3) extending from a cylinder chamber (2), and a valve portion (3) that covers the discharge hole (3) is provided on the opening side of the discharge hole (3). 41) and a cantilevered plate valve (4) with an attachment (42) to the compression element (1)
In the discharge valve mechanism of the compressor provided with, the compression element (1) is formed of casting, and the discharge hole (3) is
A discharge valve mechanism in a compressor, characterized in that a cylinder (5) having a collar-shaped valve seat (51) for seating a valve portion (41) is inserted and fixed. 2. A recess (6) is provided at the opening end of the discharge hole (3) on the cylinder chamber side, and a caulking part which is folded back to the recess (6) at the insertion tip side of the tubular body (5). The discharge valve mechanism in the compressor according to claim 1, wherein (52) is provided. 3. A discharge valve in a compressor according to claim 1 or 2, wherein the plane of the insertion leading edge in the inserted state of the tubular body (5) is finished to be flush with the wall surface of the cylinder chamber (2). mechanism. 4. A discharge valve mechanism for a compressor according to claim 1, 2 or 3, wherein the discharge hole (3) is opened radially outward of the cylinder chamber (2). 5. The discharge hole (3) is an elliptical hole whose minor axis coincides with the circumferential direction of the cylinder chamber (2), and the tubular body (5) is an elliptic cylinder corresponding to the discharge hole (3). The discharge valve mechanism in the compressor according to claim 4. 6. A cylinder (1) having a collar-shaped valve seat (51) for seating a valve portion (41) of a plate valve (4) in a discharge hole (3) opening in a compression element (1) made of casting. 5) Inserting and fixing 5), and after this first step, the compression element (1)
Second, the wall surface of the cylinder chamber (2) and the flat surface of the leading edge of the cylindrical body (5) are polished to be the same surface.
A method of manufacturing a discharge valve mechanism in a compressor, comprising: 7. The fixing of the tubular body (5) to the discharge hole (3) in the first step is carried out in the recess (6) provided at the opening end of the discharge hole (3) on the cylinder chamber side. 7. The method for manufacturing a discharge valve mechanism in a compressor according to claim 6, wherein the insertion tip side of 5) is folded back.