JPS62165584A - Fluid machine - Google Patents

Abstract

PURPOSE:To reduce the slide resistance of a fluid machine, by disposing a fluorresin material between the slide end faces of a cylinder block and a seat value member. CONSTITUTION:There is disposed, in a casing 1, a motion converting mechanism 10 and an operating chamber assembly 9 composed of a cylinder block 12, a piston section 13 and a piston device 15. A thin plate-like tetrafluorresin material 12A is applied on the end face of the cylinder block 12. Accordingly, the slide resistance between the sliding cylinder block 12 and a float valve 21 is reduced, and therefore, air-tightness is always held in a stable condition, thereby it is possible to greatly enhance the efficiency of the fluid machine.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to fluid machines, and is particularly applicable to near compressors or hydraulic pumps that operate by pumping a working fluid such as gas or oil to obtain discharge pressure. The present invention relates to a suitable fluid machine.

[Conventional technology]

2. Description of the Related Art In general, a type that rotates a cylinder block is well known as a liquid pump that pumps a working liquid such as oil or a liquid motor that obtains rotational force using the head energy of the working liquid. In this case, a side plate having a high pressure chamber is disposed on the end face of the cylinder block, and a seat valve member is disposed between the side plate and the end face of the cylinder block to airtightly seal the working fluid in the high pressure chamber. Ru.

This seat valve member is fixed to the high pressure chamber side of the side plate and hermetically seals the working fluid while sliding on the cylinder block.

Therefore, the discharge force of the working fluid from the high pressure chamber depends on the machining accuracy and assembly accuracy between this seat valve member and the end face of the cylinder block, and how to improve airtightness is a major issue. It had become.

Therefore, as shown in Japanese Patent Application No. 59-28014, airtightness was achieved by surrounding the high pressure chamber with a seal ring and using the discharge pressure to press the seat valve member toward the cylinder block. There is something designed to increase this.

[Problem that the invention seeks to solve]

However, when the through-hole diameter of the cylinder block is enlarged to increase the capacity of a fluid machine, the contact area with the seat valve member decreases, increasing sliding resistance. , the force pressing the cylinder block increases more than necessary, the sliding resistance increases significantly, and the sliding resistance generates heat between the cylinder block and the seat valve member, resulting in a problem that efficiency decreases. was.

An object of the present invention is to provide an efficient fluid machine that reduces sliding resistance between a seat valve member and a cylinder block end face.

[Means for Solving the Problems] The present invention reduces sliding resistance by interposing a fluorocarbon resin on the sliding surface between the cylinder block end face and the seat valve member. .

[Effect]

The cylinder block end face and the seat valve member slide relative to each other via a fluorine-based resin having a small coefficient of friction.

Therefore, mutual sliding resistance is reduced.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a sectional view of a main part of a near compressor to which the present invention is applied, and FIGS. 2 and 3 are enlarged views of its structural parts. In the figure, a side plate 3 is disposed on the open end surface of a substantially bowl-shaped casing 1 via an O-ring 2, and is fastened to the casing 1 with several assembly screws. A drive shaft 5 is inserted through the center of the casing 1, and a gear cylinder 4 having a helical bevel gear 4A at its tip is fitted therein. The gear cylinder 4 is connected to the interior IA of the casing 1 via a radial bearing 6, and a mechanical seal mechanism 8 is provided between the small moving shafts 5 to prevent removal by a clip 7. .

A working chamber assembly 9 and a motion conversion mechanism section 10 are housed inside the casing 1. Here, the working chamber assembly 9 includes a plurality of through holes 1 provided at equal intervals as shown in FIG.
1 and made of a light alloy such as an aluminum alloy, and a piston portion 1 fitted into the through hole 11.
3 and a piston device t15 having a steel ball 14. A thin plate-shaped tetrafluorinated resin 12A is attached to the end face of the cylinder block 12. Further, a fixed shaft 16 is installed on the inner wall surface of the side plate 3 and is arranged at an angle of about 20 degrees with respect to the drive shaft 5.

On the outer periphery of the fixed shaft 16, a ringing shaft 18 is provided with a helical bevel gear 18A at its tip via a bearing 17 and meshing with the helical bevel gear 4A.
is installed. The cylinder block 12 is fitted on the outer periphery of the driven shaft 18, and a spherical end surface 5A4 formed integrally with the drive shaft 5 or a bottom surface bearing 19 for receiving balls formed separately is provided on the inner periphery tip. ffjCN is fixed.

Furthermore, an arc-shaped low pressure passage 3B communicating with the suction port 3A and an arc-shaped high pressure passage 3D communicating with the discharge port 3C formed opposite to the passage 3B are formed on the inner wall surface of the side plate 3. A seal ring 20 made of rubber or the like is embedded around the high pressure passage 3D to form a high pressure chamber. Reference numeral 21 designates a float valve that constitutes the cylinder head, and as shown in FIG. 2, it is constructed of a horseshoe-shaped iron plate on the high-pressure side, and is arranged between the side plate 3 and the cylinder block 12. .

This float valve 21 is provided so that a small discharge hole 21A communicates with a high pressure chamber formed in the side plate 3, and a reed valve 25 and a pulp presser 26 are attached to the wall side of the side plate 3 by two screws. Fixed. float valve 2
The outer periphery of the shaft 1 is disposed with a certain gap between the casing 1 and the fixed shaft 16, and is movable in the axial direction.

On the other hand, on the outer periphery of the gear cylinder 4 on the side of the drive shaft 5, a rotating plate 23 whose back surface is supported on the casing 1 by a last bearing 22 is fixed, and on the concave surface of the outer periphery, steel balls 1 of the visdon device 15 are fixed.
4 is rotatably inserted, and is prevented from being pulled out by the crimping force of opening expansion and is supported.

Furthermore, the high pressure passage (survey pressure chamber) 3D of the side plate 3 and the spherical bearing 19
The through hole 19A provided therebetween communicates via a passage 3E provided in the side plate 3 and a passage 16A provided in the fixed shaft to form an oil supply hole. A bushing 24 is arranged between the fixed shaft 16 and the spherical bearing 19 to buffer thrust force and distribute lubricating oil.

In the above configuration, when the drive shaft 5 is rotated by, for example, an internal combustion engine, the rotary plate 23 is rotated via the gear cylinder 4. This rotation simultaneously rotates the driven shaft 18 via the helical bevel gears 4A and 18A, and causes the cylinder block 12 to rotate.
Also rotate. When the cylinder block 12 and rotary plate 23 rotate synchronously in this manner, the piston device 15 moves toward the bottom dead center and starts the suction process from the low-pressure side passage. At the bottom dead center, the float valve 21 covers the through hole 11 of the cylinder block 12, so the suction passage is closed and the suction process is completed.

When the cylinder block 11 further rotates and moves, the piston device [15] moves toward the top dead center, the internal pressure surrounded by the through hole 11 and the piston device 15 rises, and when a certain discharge pressure is reached, the float It is discharged into the high pressure chamber formed in the side plate 3 through the small hole 21A of the valve 21 and the reed valve 25, and the discharge process is completed at the top dead center.

On the other hand, when the pressure in the high pressure chamber increases, the seal ring 2
Pressure is applied to the float valve 21 by the portion surrounded by 0 (high pressure chamber 3D), and in order to press against the end face of the cylinder block 12, the through hole 11tl is hermetically closed with a self-cutting blade.

Here, the present invention is characterized in that a plate-shaped tetrafluorinated resin 12A is attached to the end face of the cylinder block 12, but there is a m bare plate between the sliding cylinder block 12 and the float valve 21. By interposing the fluorine-based resin with a small coefficient, the sliding resistance between the two is eased, and airtightness is always maintained in a stable state. Additionally, since heat generation due to sliding resistance is reduced, the performance of the compressor is improved, and its durability is greatly improved even under harsh conditions (high-speed, high-pressure operation).

In addition, in this example, as shown in FIG. 2, the case where fluorocarbon resin was pasted on the cylinder block side was explained.
A similar effect can be obtained by pasting it on the float valve side as shown in FIG. Furthermore, as a method for interposing the fluorocarbon resin, in addition to pasting with an adhesive, coating may be used.

Further, although an example in which the present invention is applied to a compressor is shown, the present invention can be similarly applied to other fluid machines.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to reduce the sliding resistance between the cylinder block end face and the seat valve member, thereby eliminating heat generation and lubrication failure due to sliding friction, and greatly improving effectiveness. There are effects such as being able to.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a compressor to which the present invention is applied, and FIGS. 2 and 3 are enlarged views of the main parts of FIG. 1. 1... Casing, 3... Side plate, 5... Drive shaft,
3D... High pressure passage (high pressure chamber), 15... Pist/device, 12... Cylinder block, 12A... 4 fluorinated resin, 18... Drive shaft, 21... Float valve, 4A
, 18A...Pe No. 1 Port 3 Figure

Claims (1)

[Scope of Claims] 1. A cylinder block that rotates in accordance with the rotation of a shaft-supported drive shaft, and a side plate that forms a high pressure chamber between the cylinder block and the end surface of the cylinder block via a seat valve member, In a fluid machine that operates by obtaining fluid discharge force from the high pressure chamber through reciprocating motion of a piston disposed in a through hole of the cylinder block, a fluorine-based material is applied to the sliding surface between the seat valve member and the end face of the cylinder block. A fluid machine characterized by intervening resin. 2. The fluid according to claim 1, wherein the fluorine-based resin is adhered to or coated on one of the end face of the cylinder block and the seat valve member, which are in a relatively sliding relationship. machine.