JPS6345577Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Field of Industrial Application The present invention relates to an air compressor, and particularly to improvements in the cylindrical cylinder structure and its mounting structure within the air compressor.

(2) Prior Art Conventionally, the structure of a cylindrical cylinder used in an air compressor is a cylindrical structure that is fitted into a valve plate and a case. Moreover, the material of the cylinder is
They are mostly cylindrical and made of metal, and some have aluminum coating on their inner walls.

(3) Problems to be solved Therefore, if a conventional air compressor is used for a long time, the inner wall of the cylindrical cylinder will be burned and damaged by the frictional heat and compression heat caused by the reciprocating movement of the ring, so the inner wall of the cylindrical cylinder will become damaged. There was a problem that the life of the shaped cylinder was short and it had to be replaced frequently.

(4) Purpose The purpose of this invention is to prolong the life of the cylindrical cylinders used in air-cooled air compressors, in view of the above circumstances, and to solve the problems. Another object of the present invention is to provide an improved air-cooled air compressor that reduces the number of replacements.

(5) Means for solving the problem The present invention is an improvement of the conventionally used air-cooled air compressor. and cylinder head.
In the air compressor described above, the cylindrical cylinder is made of ceramic. In the upper and lower opening end surfaces of the cylindrical cylinder, a groove is formed in the center of the wall width in an annular shape along the inner peripheral surface.

The valve plate is characterized in that the annular protrusion of the gasket is fitted into the groove and fitted between the valve plate and the case body.

Conventionally, cylindrical cylinders are made of steel with an aluminum coating on the inner wall, but the heat and compression heat generated by the reciprocating motion of the piston rings causes the inner wall of the cylindrical cylinder to become severely damaged. It burns and gets damaged and cannot withstand long-term use. Therefore, an important point of the present invention is to form the cylindrical cylinder from ceramic that can withstand the high temperatures of mass heat and compression heat.

However, if the material of the cylindrical cylinder is simply made of ceramic, the upper and lower end surfaces will be tightly fitted, and there is a risk that the upper and lower end surfaces will be damaged. In order to prevent the upper and lower end surfaces from chipping, a gasket made of a rubber material or the like is interposed and fitted between the valve plate and the case body.

As a means for this, a groove is formed in the upper and lower opening end surfaces of the cylinder in the center of the wall width in an annular shape along the inner peripheral surface, and an annular protrusion protruding from one side of a packing formed in an annular shape is fitted into the groove. I tried to force it.

The shape of the groove may be any one of various shapes, such as a semicircular cross section or a V-shape, but a semicircular shape is most suitable.

Note that the fitting of the concave groove with the gasket of the annular protrusion also serves to determine the position of the cylindrical cylinder itself. On the opposite side of the packing having annular protrusions, for example, two small annular protrusions are arranged side by side on the wall width, which improves the sealing performance when fitting the valve plate and case body. This is for the purpose of

In addition, when fitting the upper and lower opening ends of the cylinder with gaskets, the shape of the gasket is such that it covers the outer periphery of the upper and lower opening ends of the cylindrical cylinder, or a cylindrical member made of aluminum or the like is fitted to the outer periphery of the cylinder. In particular, the cylinder itself is protected.

(6) Function The present invention has a cylindrical cylinder made of ceramic with excellent heat resistance, abrasion resistance, thermal expansion resistance, etc., and a concave groove is formed in the center of the wall width on the upper and lower open end surfaces of the cylinder. Since the annular protrusion of the packing is fitted into the concave groove and the cylinder is fitted between the valve plate and the case body, even if the piston ring reciprocates for a long time, it will not burn due to frictional heat and compression heat. It can operate without any problem.

(7) Example Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a side sectional view of the air compressor of the present invention, and FIGS. 2 to 4 are sectional views showing how the cylindrical cylinder is attached.

In FIG. 1, a driving machine is mounted inside a case body 1. As shown in FIG. In the drive device, a drive shaft 3 is attached to a motor 2, and an eccentric roller 4 is attached to the drive shaft 3. A lower annular portion 5a of a piston 5 is fitted into the eccentric roller 4 and screwed with a bolt 6. As the eccentric roller 4 is rotated by the motor 2 via the drive shaft 3, the piston 5 reciprocates up and down along the inner wall 7a of the cylindrical cylinder 7.

At the tip of the piston 5 is a ring 8 made of tetrafluoroethylene resin (trade name: Teflon).
is inserted between the disk 9 and the presser disk 10, and the disk 9 and the presser disk 10 are fitted together. Therefore, the ring 8 reciprocates along the inner wall 7a of the cylindrical cylinder 7.

Annular grooves 1b and 11a are formed in the upper part 1a of the case body 1 and the lower part of the valve plate 11, respectively, for fitting the cylindrical cylinder 7 thereinto.
The cylindrical cylinder 7 is fitted to a.

The cylinder 7 is made of ceramic,
Ceramic has strong heat resistance, so the cylindrical cylinder will not burn due to frictional heat and compression heat.
However, since ceramic is brittle against impact forces, it is necessary to cover the end faces. Therefore, as shown in FIG. 2, annular grooves 7b and 7c are formed in the center of the wall width of the upper and lower opening end faces of the cylinder along the inner peripheral surface, and a packing 12 is formed in the annular grooves 7b and 7c. Annular protrusion 1 protruding from one side of 13
With 2a and 13a fitted, cylinder 7
The valve plate 11 and the annular groove 11 in the upper part 1a of the case body
Fits between a and 1b.

The annular protrusions 12a and 13a of the packing have a shape that fits well into the grooves 7b and 7c of the cylinder 7, and the semicircular shape applies force uniformly from all directions, which is effective in positioning the cylinder 7. It is true.

Packing skin 1 having annular protrusions 12a and 13a
On the opposite side of 2 and 13 are two small annular protrusions 12.
b, 13b are provided in order to improve the sealing performance when the valve plate 11 and the upper part 1a of the case body 1 are fitted together.

In order to make the cylindrical cylinder 7 fit more firmly into the valve plate 11 and the upper part 1a of the case body 1 than shown in FIG. 2, it is shaped like a gasket as shown in FIGS. 3 and 4. It gets even better.

In Fig. 3, the outer periphery of the upper and lower open ends of the cylindrical cylinder 7 is covered with packing, and in Fig. 4, as an improvement on Fig. 3, the outer periphery of the cylindrical cylinder 7 is made of aluminum. The cylindrical member 14 is fitted to prevent the cylindrical cylinder 7 from chipping due to external impact.

A cylinder head 15 is placed on the valve plate 11,
The cylinder head 15, the valve plate 11 and the upper part 1a of the case body 1 are screwed together with bolts 16. Inside the cylinder head 15, an air intake valve chamber 17 and an air discharge valve chamber 18 are provided.

A suction hole 20 and a discharge hole 21 for sucking and discharging air from the suction valve chamber 17 to the cylinder chamber 19 and from the cylinder chamber 19 to the discharge valve chamber 18 are bored in the valve plate 11, respectively.

A suction valve 22 and a discharge valve 23, which suck in and discharge air from the suction hole 20 and discharge hole 21 through the reciprocating motion of the piston 5, are provided on the upper and lower surfaces of the valve plate 11, respectively, in order to open and close from the suction hole 20 and the discharge hole 21, respectively. bolt 2
It is screwed on with 4.25.

A supply hole 26 for supplying air and a suction hole 27 for sucking out air are bored in the side wall of the cylinder head 15, respectively, and piping pipes 28 and 29 are connected to the supply hole 26 and the suction hole 27, respectively. ing.
Compressed air is sent from the suction pipe 29 to a tank (not shown). A safety valve 30 is provided in the middle of the suction pipe 29, and the safety valve 30 is closed in the event of an abnormality.
is starting to work.

Note that fan blades 31 are attached to the drive shaft 3 to blow air into the cylinder, piston, motor, etc. to cool them.

Next, the operation of the present invention will be explained.

Rotation is transmitted from a motor 2 mounted in a case body 1 to an eccentric roller 4 via a drive shaft 3, and a ring 8 of a piston 5 fitted to the eccentric roller 4 is rotated into a cylindrical cylinder 7 made of ceramic. It reciprocates up and down along the inner wall 7a.

Due to the reciprocating movement of the ring 8 of the piston 5, air is supplied from the supply hole 26 bored in the side wall of the cylinder head 15 and sent into the suction valve chamber 17. The air sent into the suction valve chamber 17 is supplied to the cylinder chamber 19 through the suction hole 20 and the suction valve 22 opened by the lowering of the ring 8 of the piston 5 . The air supplied to the cylinder chamber 19 is compressed by the rise of the ring 8 of the piston 5, and the air is compressed by the rising of the ring 8 of the piston 5.
1 is opened and sent to the discharge valve chamber 18. At this time, the suction valve 22 is closed by the rise of the ring 8 of the piston 5. The compressed air sent to the discharge valve chamber 18 passes through the suction hole 27, is sent from a pipe 29 to a tank (not shown), and is temporarily stored.

The cylindrical cylinder 7 is made of ceramic and has a second
By installing the cylinder 7 as shown in FIG. 4, the cylinder 7 will not burn out even after long-term operation, and its durability will be doubled.

(8) Effects of the invention In this invention, the cylindrical cylinder is made of ceramic.
A recessed groove is formed in the center of the wall width at the upper and lower opening ends of the cylinder, and the annular protrusion of the packing is fitted into the recessed groove, and the cylindrical cylinder is fitted between the valve plate and the case body. Therefore, even if the piston ring reciprocates for a long time along the inner wall of the cylindrical cylinder,
The cylinder will not burn out due to frictional heat and compression heat. Moreover, since the cylinder is fitted through a gasket, positioning is easy, and since it is firmly fixed without swinging during movement, there is no damage due to impact force from external disturbances, and the lifespan is longer than that of conventional cylinders. This has the effect that it lasts for a long time, which means that the number of replacements can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the air-cooled compressor of the present invention, and FIGS. 2 to 4 are sectional views showing how the cylinder is installed. 1... Case body, 1a... Upper part of case body, 4
... Eccentric roller, 5 ... Piston, 7 ... Cylindrical cylinder, 7a ... Inner wall of cylindrical cylinder, 7b,
7c...Concave groove, 8...Ring, 11...Valve plate, 1
2, 13...Packing, 12a, 13a...Annular ridge, 14...Cylindrical member, 22...Suction valve, 23
...Exhaust valve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An air compressor in which a cylindrical cylinder and a cylinder head are arranged in the upper part of a case body in which a driving machine is installed, and the cylindrical cylinder is made of ceramic, and both openings of the cylindrical cylinder are made of ceramic. An air compressor characterized in that a concave groove is formed in the center of the wall width on the end face, and an annular protrusion of the gasket is fitted into the concave groove to fit between the valve plate and the case body. (2) The air compressor according to claim 1, wherein the groove formed in the center of the wall width of both open end faces of the cylindrical cylinder has a semicircular cross section.