JPH045478A - gas compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gas compressor, and particularly relates to a gas compressor that obtains a discharge pressure by pumping a small volume of working gas and is suitable for home appliances and vehicles. .

[Conventional technology]

As an example of a conventional gas compressor, JP-A-6:3-
As shown in FIG. 1 of Publication No. 309785, a cylinder block fixed to a rotating shaft and a rotary plate rotatably supported by the rotating shaft are arranged facing each other, and the cylinder block is arranged in a plurality of through holes in the cylinder block. One end of each fitted piston is rotatably connected to a rotary plate, and by synchronously rotating the cylinder block and the rotary plate, the piston force is reciprocated within the through hole. By sliding the disc-shaped piston head inside the through hole, suction, compression,
There are some that perform a discharge stroke.

In order to achieve synchronized rotation of the cylinder block and rotary plate in this manner, the publication describes that a pair of drive pins are fixedly provided on the cylinder block, and the rotational force of the cylinder block is applied to the rotary plate through this drive pin. is being communicated to.

[Problem to be solved by the invention]

The above conventional technology reliably drives the rotary plate by transmitting the rotational force of the cylinder pro-tsuku to the rotary plate using a pair of drive pins, but this requires a special structure for the drive, making the structure complicated. It was easy to increase the size and the cost was high.

The purpose of the present invention is to incorporate the driving force transmission mechanism necessary for rotating the rotary plate in synchronization with the cylinder pro-yield into two of the plurality of pistons, thereby simplifying the structure and reducing the size. and to reduce costs.

[Means to solve the problem]

In order to achieve the above object, the present invention arranges a cylinder block fixed to a rotating shaft and a rotary plate rotatably supported by the rotating shaft to face each other, and each cylinder block has a cylinder block fixed to a rotating shaft and a rotary plate rotatably supported by the rotating shaft. The piston rods of the arranged pistons are rotatably connected to the rotating plate, and by rotating the cylinder block, gas is introduced from the low pressure chamber into the working gas chamber formed by the piston head of the piston and the through hole. In a gas compressor that takes in air and discharges it into a high-pressure chamber, a pair of pistons arranged diagonally through the narrow center of the rotating shaft of at least one set of the pistons moves a piston rod to the rotating plate. The piston rod is movably connected in the radial direction, and the piston rod is provided with a guide means for preventing the piston from tilting, thereby forming a driving piston that rotates the rotary plate.

Preferably, the guide means is a drive ring provided at the piston mouth adjacent to the piston throat and sliding in the through hole. Further, the guide means may be a single piston body having a cylindrical sliding surface that connects to the piston and contacts the through hole.

[Effect]

When the rotating shaft rotates, the cylinder block rotates, and the piston and drive piston also rotate at the same time. At this time, the drive piston is guided within the through hole by the piston throat and guide means without being tilted, so that the rotational force of the cylinder block is directly transmitted to the rotary plate. In addition, since the rotating plate rotates at an angle, the locus of the contact point between the rotating plate and the piston rod is not perfectly circular, and the distance from the rotating axis changes (the rotation pitch diameter changes), but the driving piston Since the piston rod is connected to the rotating plate so as to be movable in the radial direction of the rotating plate, changes in the piston diameter are absorbed. As a result, the driving force is smoothly transmitted from the drive piston to the rotary plate without impairing synchronous rotation.

〔Example〕

Embodiments of the gas compressor according to the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional side view of a gas compressor according to a first embodiment of the present invention, in which a side cup 3 is attached to the open end surface of a bowl-shaped casing 1 with an O-ring 2 interposed therebetween and a bolt 4. A rotating shaft 7 is held at the center of the casing 1 and the side cover 3 via an angular bearing 5 and a radial bearing 6, and a shaft seal 9 is provided between the rotating shaft 7 and the casing 1 and is prevented from being removed by a clip 8. has been done. The side cover 3 is provided with a high pressure chamber 10 and a low pressure chamber 11.

A motion converting mechanism section 12 and a working gas chamber assembly 13 are housed inside the casing 1 . The motion conversion mechanism section 12 includes a swash plate 14 fixed to the casing 1 and a rotating plate 16 that is rotatably supported by a center ball 15 fitted to the rotating shaft 7 and rotates by sliding on the swash plate 14. It consists of In order to prevent the rotating plate 16 from misaligning, the center pole 1
5 is constantly pressed against the rotating plate 16 by a spring 17.

On the other hand, the inside 13 of the working gas chamber 24 includes a cylinder block 19 which has six through holes 18 in the axial direction and whose center is fixed to the rotating shaft 7 so as to face the rotating plate 16, and the six through holes 1.
The normal pistons 20 fitted to four of the eight pistons, the driving pistons 21 fitted to the remaining two pistons, and the convex portion 22a are fitted into the high pressure chamber lO via the O ring 23, and the cylinder block is assembled. The cylinder head 22 (see FIG. 4) seals a part of the open end surface of the cylinder 19. piston 2
0 and the piston rods 2OA and 21 of the drive piston 21
A ball portion 20a is provided at each tip of A.

21a is provided, and a piston head 2 is provided at the other end, respectively.
0B and 21B are provided. The spherical parts 20a and 21a are each rotatably connected to the rotating plate 16. Of the piston heads 20B and 21B, at least the sliding surface with the through hole 18 of the piston head 20B is the piston head 2.
It has a spherical surface centered on the axis of 0B, and is swingable with respect to the through hole 18. Piston head 20B, 2
A working gas chamber 24 is formed within the through hole 18 by 1B.

As shown in FIGS. 2 and 3, the six through holes 18 are
They are provided on the same radius around the axis of the rotating shaft 7. The through holes 18 into which the drive piston 21 fits are two of the six through holes 18 located on a diagonal line passing through the narrow center of the rotating shaft 7. The ball portion 21a at one end of the drive stone 21 is connected to a slide groove 21a provided in the rotary plate 16.
The rotary plate 16 is connected to the rotary plate 16 so as to be movable in the radial direction.

Further, the piston rod 21A of the drive piston 21 is provided with a drive ring 26 adjacent to the piston head 21B, which is provided with a cylindrical sliding surface that slides in the through hole 18 as a guide means for preventing the drive piston 21 from tilting. is provided. Note that the drive ring 26 and the piston rod 21A are mechanically coupled with high precision by plastic coupling or the like, thereby reducing the weight.

In the gas compressor having the above configuration, when the rotating shaft 7 is rotated by, for example, an electric motor or an internal combustion engine,
Since the cylinder block 19 rotates, the piston 20 and drive piston 21 also rotate at the same time. At this time, the driving piston 21 is connected to the piston head 21B and the driving ring 26.
Because the axial guiding action of the cylinder block 19 prevents it from tilting with respect to the through hole 18, the rotational force of the cylinder block 19 is transferred to the ball part 2.
It is transmitted to the rotating plate 16 through 1a.

Since the rotating plate 16 rotates on the swash plate 14 at an angle about the center ball 15, the rotating plate 16 and the ball portions 2Qa, 2
The locus of the contact point with 1a does not become a perfect circle, and the distance from the rotation axis 7 changes (the rotation pitch diameter changes).

Therefore, as the cylinder block 19 rotates, the piston 20 performs a piston action while being slightly inclined within the through hole 18 centered on the above-mentioned fine point of the piston head 20B, but the drive piston 21 performs a piston action with the piston head 21B and the drive ring. 26, the piston rod 21A is guided in the through hole 18 without being tilted, and since the spherical portion 21a of the piston rod 21A is movable in the radial direction by the slide groove 25, changes in pitch diameter are absorbed. Therefore, the rotational force of the cylinder block 19 is smoothly and reliably transmitted to the rotating plate 16, and the synchronous rotation of both is not impaired.

Since the cylinder block 19 and rotary plate 16 rotate synchronously in this manner, the pistons 20, 21 reciprocate within the through hole 18, and the suction, compression, and discharge processes are performed. To explain these steps based on FIG. 4, the cylinder block 1
9 rotates to the left as shown in FIG.
It is located at a position slightly moved in the rotational direction from C). As the cylinder block 19 rotates to the left, the piston 2
0 moves toward the bottom dead center (B D C), and the low pressure chamber 1
Near the end of gas suction from No. 1, the position is slightly closer to the bottom dead center than the bottom dead center. When the cylinder block 19 further rotates, the piston 2o seals the through hole 18 with the piston head 21 and the cylinder head 22, compressing the gas in the working gas chamber 24, and during further rotation, the compressed gas from the discharge boat 27 is compressed. Reach top dead center while exhaling. In this way, the suction, compression, and discharge steps are performed.

As described above, according to this embodiment, driving force can be transmitted by simply providing a drive ring on the piston, so a special driving force transmission mechanism is not required, resulting in a simple structure, and therefore, the gas compressor can be made smaller. And cost reduction becomes possible.

A second embodiment of the present invention will be described with reference to FIG.

This embodiment differs from the first embodiment in the structure of the guide means for preventing the drive piston from tilting, but the other structures are the same.

In FIG. 5, drive pistons 30 provided in two of the six through holes 18 located on the diagonal line of the rotating shaft 7 have a piston head 30B at the tip and are in contact with the inner peripheral surface of the through hole 18. A piston body 31 having a cylindrical sliding surface is provided. In other words, the piston body 31 has a structure in which the axial length of the sliding surface that contacts the inner peripheral surface of the through hole 18 of the piston head 21B of the first embodiment is increased.

A spherical portion 30a is provided at the tip of the piston rod 30A of the drive piston 30, and the spherical portion 30a is connected movably in the radial direction of the rotary plate 16 by a slide groove 25 provided in the rotary plate 16. This is similar to the embodiment shown in FIG.

The operation of this embodiment configured as described above is almost the same as that of the first embodiment, and when the rotating shaft 7 supported by the casing 1 and the side cover 3 rotates, the cylinder block 19 fixed to the rotating shaft 7 rotates. At this time, the driving piston 3
0, the piston body 31 acts as a guide means to prevent the drive piston 30 from tilting, so that it revolves around the rotating shaft 7 along with the rotation of the cylinder block 19, and applies rotational force to the rotating plate 16 via the ball portion 30a. introduce. At the same time, the ball portion 30a of the piston rod 30A is inserted into the slide groove 25.
By moving in the radial direction, changes in the pitch diameter are absorbed, the rotary plate 16 rotates synchronously with the cylinder block 19, and the piston action of the pistons 20, 30 provides a compressor function.

While the piston structure in the first embodiment was provided with a drive ring on the piston to reduce weight, this embodiment has a structure in which the piston head and drive ring are integrated, resulting in a simpler structure. There is. Therefore, this embodiment is particularly effective for smaller compressors such as compressors for home appliances.

〔Effect of the invention〕

According to the present invention, since the piston itself can transmit the driving force to the rotary plate without requiring a driving force transmission mechanism such as a joint,
It can be made into a simple structure.

Therefore, a gas compressor that can be made smaller and lower in cost can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a gas compressor according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a rotating plate, a piston, and a driving piston. FIG. 4 is a sectional view taken along line IV--IV in FIG. 1, and FIG. 5 is a sectional side view -C of a gas compressor according to a second embodiment of the present invention. Explanation of symbols 7...Rotating shaft 10...High pressure chamber 11...Low pressure chamber 1-6...Rotating plate 18...Through hole 19...Cylinder block 20...Piston 21.30. ... Drive pistons 20A, 21A, 30A... Piston rod 2OB,
21B, 30B... Piston head 24... Working gas chamber 25... Slide groove 26... Drive ring (guiding means) 31... Piston body (guiding means)

Claims (3)

[Claims] (1) A piston head of a piston in which a cylinder block fixed to a rotating shaft and a rotary plate rotatably supported by the rotating shaft are arranged facing each other, and each of the cylinder blocks is arranged in a plurality of through holes in the cylinder block. is rotatably connected to the rotary plate, and by rotating the cylinder block, gas is sucked from the low pressure chamber into the working gas chamber formed by the piston head of the piston and the through hole and discharged to the high pressure chamber. In the gas compressor, at least one pair of pistons disposed on a diagonal line passing through the axis of the rotating shaft of the pistons moves the piston rod to the rotating plate in a radial direction of the rotating plate. A gas compressor, characterized in that the piston rod is connected to the piston rod, and the piston rod is provided with a guide means for preventing the piston from tilting, thereby serving as a driving piston that rotates the rotary plate. (2) The gas compressor according to claim 1, wherein the guide means is a drive ring that is provided on the piston rod adjacent to the piston head and that slides in the through hole. (3) In the gas compressor according to claim 1, the guide means is one piston body having the piston head at the tip and a cylindrical sliding surface that contacts the through hole. gas compressor.