JPH0610466B2 - Compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a compressor, and is effective when used for refrigerant compression of an automobile air conditioner, for example.

[Conventional technology]

Conventionally, a so-called wave plate type compressor has been known in which a wave plate is used to transmit a bending change of the wave plate to a piston via a roller (Shokai 57-114184).

[Problems to be solved by the invention]

When the present inventors examined this compressor, the second
As shown in the figure, the bending change of the wave plate 100 is first transmitted to the roller 200 and then transmitted from the roller 200 to the piston. Here, since the roller 200 is in contact with the wave plate 100 over substantially the entire side surface, it can be considered that the entire load is applied to the center point of the wave plate 100 as indicated by an arrow P in FIG. Then, a bending moment generated by this load P is applied to the root portion 101 of the wave plate 100.

Therefore, in the wave plate 100, the root portion 1 is particularly
In No. 01, a sufficient load bearing capacity is required, and the wall thickness t is obtained by back-calculating from the capacity. Conversely speaking, the tip end 102 of the wave plate 100 is not required to have load bearing capacity as much as the root portion 101.

[Means for Solving Problems and Their Actions]

The first invention of the present invention has been devised in view of the above points,
It is intended to reduce the wall thickness of the wave plate front end portion 102 which does not require so much load bearing capacity.

Therefore, according to the first invention, the wave plate 100
It is possible to reduce the total load of the, and as a result, the power consumption required for starting the wave plate can be reduced. Furthermore, by making the wave plate thinner, the space inside the compressor can be used effectively.

A second aspect of the present invention is to take the above-mentioned means (the tip of the wave plate is thin) in the same manner, but especially to make it possible to reduce uneven wear of the rollers as well.

The uneven wear of the roller has been found by the present inventor after examination, and this point will be described below. FIG. 3 is an expanded view of each cross section of the wave plate in the circumferential direction. That is, since the wave plate is formed in a substantially disk shape like a shaft, its circumferential length increases as it goes away from the shaft. Figure 3 (a) shows
Development view of wave plate tip 102, FIG. 3
(c) is a development view of the wave plate 100 on the shaft side, and FIG. 3 (b) is an intermediate development view thereof. Also, point A in the figure is the position where the piston located above the wave plate 100 in the figure is the top dead center. At this point A, the piston located on the lower side of the wave plate 100 in the figure becomes the bottom dead center. Also, C point is wave plate 10
0 is the position where the upper piston in the drawing is the bottom dead center and the lower piston in the drawing is the top dead center. Furthermore, point B is an intermediate position between these points A and C.

Here, in particular, looking at the relationship between the roller 200 and the wave plate 100 at the point B, the actual contact point a differs with the radial displacement of the wave plate 100. This is because the bending ratio of the wave plate is 101
This is because it gets bigger toward the side. That is, on the root side (FIG. 3 (c)) where the bending rate is large, the actual contact point a is displaced more than the center line opening of the roller 200. On the other hand, on the tip side (FIG. 3 (a)) where the bending rate is small, the actual contact point a is relatively close to the center line b of the roller 200.

Therefore, in the second invention of the present invention, the wave plate 10
The thickness of 0 is increased toward the root side. Moreover, the change of the wall thickness is such that the change rate of the bending rate at each position of the wave plate 100 is always the same from the shaft side to the tip.

In other words, since the tip portion originally has a small rate of change in the bending rate, it may be thinner than other portions of the wave plate. However, since the bending rate of the wave plate essentially increases on the root side, the wall thickness of the wave plate is increased so that the rate of change of the bending rate is the same as that of the tip.

〔Example〕

FIG. 1 shows an embodiment of the compressor of the first invention of the present invention.
In the figure, a shaft 300 is rotatably supported by a housing 301. 302 is a front housing,
A magnet clutch (not shown) is mounted on the front housing, and the rotational force of the vehicle running engine is transmitted to the shaft 300 via the magnet clutch. 303 is the front housing 302 and the shaft 30.
An oil seal interposed between the outer ring and the outer ring prevents oil inside the housing from flowing out along the shaft 300 to the outside.

A plurality of cylinder portions 304 are formed in the housing 301, and a piston 305 is slidably arranged in the cylinder portion 304. Then, the cylinder portion 304
The space formed by the piston 305 and the end of the piston 305 serves as a pressure chamber 306, and the volume of the pressure chamber 306 varies according to the displacement of the piston 305.

Reference numerals 307 and 308 denote end plates that cover both ends of the housing 301. A front housing 302 is provided outside one end plate 307, and a rear housing 309 is provided outside the other end plate 308. A suction chamber 310 and a discharge chamber 311 are formed in the front housing 302 and the rear housing 309.
The pressure chamber 306 communicates with the suction hole and the discharge hole formed in 07 and 308.

The wave plate 100 according to the first aspect of the present invention is the first
The cross-sectional shape is as shown in the figure. That is, it has a trapezoidal shape that is bilaterally symmetrical over the entire circumference. However, as shown by the broken line in FIG. 3, the wave plate 100 according to the second aspect of the present invention has two top dead centers B along its circumferential direction.
And has a waveform shape such that two bottom dead centers A occur. Therefore, the roller 20 of the wave plate 100
The contact line with 0 is displaced in the left-right direction in FIG. 1 as the shaft 300 rotates. Therefore, the cross-sectional shape of the wave plate 100 according to the second aspect of the present invention is not a symmetrical trapezoid. FIG. 5 shows a cross-sectional shape at the top dead center / bottom dead center (A and C in FIG. 3) of the wave plate 100.
As is clear from this figure, there is no increase in the wall thickness at the top dead center position A, but at the bottom dead center position C there is a large increase in the wall thickness.

Further, as is clear from the broken line in FIG. 3, the change rate of the bending of the wave plate 100 is at least the roller 20.
In the part which contacts 0, it is the same over the entire length in the radial direction.

Although the roller 200 has a cylindrical shape, as described above, in this example, since the change rate of the bending of the wave plate 100 is the same over the entire length in the radial direction, the actual contact point a of the roller 200 and the center line of the roller 200 are the same. The intervals are the same over the entire radial length of the wave plate 100. In other words, this means that the contact line between the roller 200 and the wave plate 100 is a straight line. Further, in other words, it means that the relative contact speed with the wave plate 100 at each point of the roller 200 becomes uniform over the entire length of the roller 200. Therefore, the roller 200 rotates smoothly without idling,
And the load is evenly applied over its entire length. as a result,
Uneven wear of the roller 200 and the wave plate 100 is well prevented.

In response to the displacement of the roller 200, the piston moves to the cylinder portion 3
The pressure chamber 306 is reciprocated in 04 to change the volume of the pressure chamber 306. In the suction process in which the pressure chamber 306 expands in volume, a refrigerant is introduced from the suction chamber 310. Conversely, pressure chamber 3
In the compression process in which the volume of 06 is reduced, the refrigerant in the pressure chamber 306 is compressed and discharged from the discharge hole to the discharge chamber 311.
A low-temperature low-pressure refrigerant is introduced into the suction chamber 310 from an evaporator (not shown) of the refrigeration cycle, and a high-temperature high-pressure compressed refrigerant is discharged from the discharge chamber 311 to a condenser (not shown).

Although the roller 200 is formed in a cylindrical shape in the above example, it may be formed in a conical shape as shown in FIG.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the compressor of the present invention, FIG. 2 is a cross-sectional view showing a part of a conventional compressor, FIG. 3 is an explanatory view showing a developed cross-section of a wave plate, and FIG. Is a sectional view showing another example of the compressor of the present invention, and FIG. 5 is a sectional view showing an example of a wave plate of the compressor shown in FIG. 100 ... Wave plate, 200 ... Roller, 3
00 ... Shaft, 301 ... Housing, 304 ...
Cylinder part, 305 ... Piston.

Claims (2)

[Claims] 1. A housing having a cylinder portion therein,
A shaft rotatably supported by the housing, a wave plate that rotates integrally with the shaft, a piston that reciprocates in the cylinder portion, and a bending change of the wave plate that is interposed between the piston and the wave plate. To the piston, and the wave plate is formed in a taper shape in which the wall thickness becomes smaller as the distance from the shaft increases. 2. A housing having a cylinder portion therein,
A shaft rotatably supported by the housing, a wave plate that rotates integrally with the shaft, a piston that reciprocates in the cylinder portion, and a bending of the wave plate that is interposed between the piston and the wave plate. A compressor having a cylindrical roller for transmitting a change to the piston, and forming the wave plate in a taper shape so that the bending change rate is the same over the entire length in the radial direction of the wave plate.