JPH0231590Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a locking piston type air compressor that is suitably used for supplying compressed air to, for example, a vehicle height adjustment device.

[Prior art]

4 and 5 show a locking piston type air compressor according to the prior art.

In the figure, reference numeral 1 denotes a crankcase with a crank chamber A defined therein. On one side of the crankcase 1, as shown in FIG. A motor case 2 containing a motor (not shown) is airtightly attached to the cylindrical portion 1B. Reference numeral 3 indicates an output shaft of the motor, and the distal end side of the output shaft 3 is rotatably supported by the partition wall 1A via a bearing 4, and projects into the crank chamber A. 5 is located in the crank chamber A and the output shaft 3
A balance weight 5A is provided on the crankshaft 5 to balance the rotation when it is rotationally driven by the output shaft 3.

6 is a bolt 7 on the other end surface of the crankcase 1;
7, . . . show a cover fixed by 7, . Further, reference numeral 8 indicates an intake port provided in the crankcase 1, and the intake port 8 is formed at the lower end side of the crankcase 1 as shown in FIG. It's summery.

9 is a cylindrical cylinder airtightly mounted on the crankcase 1; 10 is a cylinder head airtightly mounted on the cylinder 9; compressed air is discharged in the axial and radial directions of the cylinder head 10; A hole 10A and a discharge port 10B are provided,
The discharge port 10B is connected to an air tank (none of which is shown) via an air dryer. Reference numeral 11 indicates a discharge valve located between the discharge port 10B and the discharge hole 10A, and which is seated on and off the discharge hole 10A.
1 is slidably inserted into a plug 12 screwed onto the cylinder head 10, and is constantly urged by a spring 13 onto the discharge hole 10A.

14 is a locking piston slidably inserted into the cylinder 9;
A piston rod 15 is integrally provided at the center of the lower surface, and the lower end of the piston rod 15 is rotatably attached to the crankshaft 5 via a bearing 16. The locking piston 14 swings and reciprocates within the cylinder 9 via a piston rod 15 as the crankshaft 5 rotates, forming a compression chamber B between it and the cylinder head 10. . In addition, the locking piston 1
4, one large diameter intake hole 14A is axially bored at a position radially apart from the piston rod 15, and the intake hole 14A is connected to a fixing ring 18 which will be described later.
The air in the crank chamber A is sucked into the compression chamber B together with the intake hole 18A.

17 is a ripple ring provided on the locking piston 14; 18 is a fixing ring that fixes the ripple ring 17 on the locking piston 14;
Similarly, the locking piston 14 is formed into a disk shape from a metal material, and is fastened to the upper surface of the locking piston 14 with a screw 19. And the fixing ring 18
Another intake hole 18A communicating with the intake hole 14A is bored at a position corresponding to the intake hole 14A. On the other hand, the ripple ring 17 is made of a highly wear-resistant resin material such as polytetrafluoroethylene (Teflon), and its inner peripheral end is held between the fixed ring 18 and the locking piston 14. There is. And the ripple ring 1
The outer peripheral end side of the cylinder 7 is bent so as to surround the outer peripheral side of the fixed ring 18, so that the locking piston 14, the fixed ring 18, and the cylinder 9 are airtightly sealed. In addition, the ripple ring 17
The outer peripheral end of the locking piston 14 is elastically deformed appropriately from a circular shape to an elliptical shape, for example, in response to the rocking movement of the locking piston 14, and is always in sliding contact with the inner peripheral surface of the cylinder 9.

Furthermore, 20 is an intake hole 18A of the fixed ring 18.
The intake valve 20 is made of an elastically deformable metal material and has a thin plate shape, and the proximal end thereof is fitted with a fixing ring 18 and a screw 1.
It is held between the head of No.9. The intake valve 20 opens during the intake stroke of the locking piston 14, and the air in the crank chamber A is sucked into each intake hole 14.
It is drawn into the compression chamber B through A and 18A, and the valve is closed as shown in the figure during the compression stroke. A recess 10C corresponding to the head of the screw 19 is formed on the bottom side of the cylinder head 10, and the recess 10C is such that when the locking piston 14 reaches the top dead center, the head of the screw 19 is inserted into the cylinder. It is designed to prevent it from coming into contact with the bottom side of the head 10.

The air compressor according to the prior art has the above-mentioned configuration, and its operation will be described next.

First, when the crankshaft 5 is rotationally driven by the output shaft 3 of the motor, the locking piston 14 is reciprocated while being oscillated within the cylinder 9 by the crankshaft 5. During the suction stroke in which the locking piston 14 reaches from the top dead center to the bottom dead center, the pressure inside the compression chamber B becomes negative, so the intake valve 20 opens and the air inside the crank chamber A is sucked into the intake stroke. Hole 14A, 18
A is drawn into the compression chamber B. On the other hand, during the compression stroke in which the locking piston 14 reaches from the bottom dead center to the top dead center, the intake valve 20 closes and the air in the compression chamber B is compressed to a predetermined pressure. Then, when the pressure within the compression chamber B reaches a predetermined pressure,
The discharge valve 11 opens against the force of the spring 13, and compressed air is discharged from the discharge hole 10A toward the discharge port 10B and stored in the air tank via the air dryer.

[Problem that the invention attempts to solve]

By the way, in the above-mentioned conventional technology, since the high pressure in the compression chamber B acts directly on the intake valve 20 during the compression stroke, the intake valve 20 is formed of a metal material, and the intake valve 20 is made of a metal material. I'm trying to increase the strength.

For this reason, in the prior art, the metal intake valve 20 comes to sit on and off the metal fixing ring 18, making it difficult to airtightly close the intake hole 18A when the intake valve 20 is closed. There are drawbacks. Furthermore, when the intake valve 20 repeatedly opens and closes, the intake valve 20 collides with the fixing ring 18, producing a loud banging sound.

The present invention was developed in view of the above-mentioned shortcomings of the prior art.The present invention can airtightly close the intake hole when the intake valve is closed, improve the sealing performance, and reduce the noise caused by the operation of the intake valve. Another object of the present invention is to provide an air compressor that can reliably reduce hitting noise.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention includes a crankcase that rotatably supports a crankshaft, a cylinder and a cylinder head mounted on the crankcase, and a cylinder that is connected to the crankshaft and has a cylinder inside the cylinder. a locking piston that reciprocates while rocking and forms a compression chamber between the locking piston and the cylinder head; a fixing ring that fixes a ripple ring provided on the locking piston; A valve chamber formed between the piston and a flexible resin material,
A structure consisting of an intake valve provided in the valve chamber and a discharge valve provided in the cylinder head is adopted.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. In the embodiment, the same components as those of the prior art shown in FIGS. 4 and 5 are given the same reference numerals, and their explanations will be omitted.

In the figure, reference numeral 21 indicates a locking piston that is slidably inserted into the cylinder 9. The locking piston 21 is formed almost the same as the locking piston 14 described in the prior art, and the center of the lower surface is A piston rod 15 is integrally provided. However, a disk-shaped convex portion 21A is formed with a predetermined height on the upper surface side of the locking piston 21, and a substantially rectangular-shaped concave portion 21B is formed on the center side of the convex portion 21A. It is recessed to a predetermined depth. A stepped cylindrical screw seat 21C is formed in the recess 21B to protrude from the convex portion 21B, and is located on the right side in the figure.
It is placed at the same height as A. Further, on the bottom side of the recess 21B, three small-diameter intake holes 21E, 21E, . are doing.

22 is a ripple ring provided on the locking piston 21; 23 is a fixing ring that fixes the ripple ring 22 on the locking piston 22; the fixing ring 23 is almost the same as the fixing ring 18 described in the prior art. Although it is formed into a disk shape, there is a ring-shaped projection 23A on the outer peripheral side of the lower surface.
is provided with an inner diameter corresponding to the convex portion 21A. The fixing ring 23 has a mounting hole 2 at a position corresponding to the small diameter side of the screw seat 21C.
3B is drilled, and the mounting hole 23B is screwed into the screw seat 21C.
When the fixing ring 23 is fitted to the small diameter side of the
is fastened onto the convex portion 21A and step portion 21D of the locking piston 21 with a screw 19.
At this time, the protrusion 23A of the fixing ring 23 is fitted around the protrusion 21A, and the locking piston 23A is fitted around the protrusion 21A.
1, the inner circumferential end side of the ripple ring 22 is firmly clamped.

Here, the ripple ring 22 is formed substantially in the same manner as the ripple ring 17 described in the prior art, and is designed to airtightly seal between the fixed ring 23, the locking piston 21, and the cylinder 9.
A valve chamber 24 is formed between the recess 21B of the locking piston 21 and the fixing ring 23. A valve chamber 24 is formed in which an intake valve 25 (to be described later) can be opened and closed at a predetermined lift height. . Further, in the fixing ring 23, two intake holes 23C, 23C are arranged in a row at the left end side of the valve chamber 24 as shown by the two-dot chain line in FIG. Valve chamber 24
The inside is always communicated with the inside of the compression chamber B.

Further, reference numeral 25 denotes an intake valve disposed within the valve chamber 24 so as to be seated on and off each intake hole 21E of the locking piston 21. The intake valve 25 is made of a flexible material such as rubber or soft synthetic resin. It is formed of a resin material into a substantially rectangular shape slightly smaller than the recess 21B, and a mounting hole 25A corresponding to the large diameter side of the screw seat 21C is bored at the base end thereof.
Then, the intake valve 25 connects the mounting hole 25A to the screw seat 2.
When the screw 1 is fitted to the large diameter side of the screw 1C,
9 is attached within the valve chamber 24 via a fixing ring 23. Further, the distal end side of the intake valve 25 is formed to be slightly thinner than the proximal end side, and an oval annular projection 25B is formed slightly downwardly on the lower surface side so as to surround each intake hole 21E. It is installed protrudingly. On the other hand, a gap S of an appropriate size is formed between the upper surface of the tip side of the intake valve 25 and the fixing ring 23, and the gap S regulates the lift height when the intake valve 25 is opened. This prevents a delay in closing the valve 25 when the valve is closed.

The air compressor according to this embodiment has the configuration described above, and its basic operation is not particularly different from that of the prior art.

However, in this embodiment, the locking piston 21
A recess 21B is provided on the upper surface side, a valve chamber 24 is formed between the recess 21B and the fixing ring 23, and an intake valve 25 formed of a flexible resin material is inserted into the valve chamber 24. Each intake hole 2 of the king piston 21
Since the intake valve 25 is provided so as to be seated and separated from the intake valve 1E, the sealing performance of the intake valve 25 can be improved compared to the prior art, and the operating noise or tapping noise of the intake valve 25 can be reduced. In particular, the intake valve 25
Since an oval annular projection 25B is provided on the lower surface of the distal end side so as to surround each intake hole 21E, the annular projection 25B can be brought into close contact with the bottom surface of the recess 21B when the intake valve 25 is closed. Each intake hole 21E
can be sealed airtight.

Furthermore, a gap S of an appropriate size is formed between the upper surface of the front end side of the intake valve 25 and the fixing ring 23 to restrict the lift height of the intake valve 25. In addition to being able to prevent closing delays when closing the valve and improving volumetric efficiency, the intake valve 2
It is also possible to effectively prevent the valve 5 from opening wide and making operating noise, hammering noise, etc. louder.

Furthermore, the locking piston 21 is provided with three small-diameter intake holes 21E in a row, and the intake valve 25 is seated on each intake hole 21E. Even if a high pressure acts on the intake valve 25, the load at this time is distributed to each intake hole 21E,
It is possible to prevent a large load from acting locally on the intake valve 25, improve the impact resistance of the intake valve 25, etc.
Lifespan can be improved.

In addition, in the embodiment, there are three intake holes 21E,
Although two intake holes 23C are provided, two or four or more intake holes 21E and one intake hole 23C are provided.
It is also possible to provide three or more.

[Effect of idea]

As detailed above, according to the present invention, a valve chamber is formed between the locking piston and the fixed ring,
Since the intake valve made of a flexible resin material is provided in the valve chamber, the intake valve can be seated airtightly on the intake hole of the locking piston, and the seal is secured when the valve is closed. can improve sex. In addition, it is possible to reduce the operating noise or tapping sound when the intake valve repeatedly opens and closes, and it is also possible to regulate the lift height of the intake valve in the valve chamber, preventing delays when closing the valve. ,
Various effects can be achieved.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention,
Figure 1 is a longitudinal sectional view of the air compressor, Figure 2 is an enlarged sectional view of the main parts in Figure 1, Figure 3 is a sectional view in the direction of the arrow in Figure 2, and Figure 4. 5 shows the prior art, FIG. 4 is a vertical cross-sectional view of an air compressor, and FIG. 5 is indicated by the arrow in FIG.
It is a directional cross-sectional view. 1...Crank case, 5...Crankshaft, 9
...Cylinder, 10...Cylinder head, 11...
...Discharge valve, 19...Screw, 21...Locking piston, 21E, 23C...Intake hole, 22...Rip ring, 23...Fixing ring, 24...Valve chamber, 25...Intake valve, A... Crank chamber, B...
compression chamber.

Claims (1)

[Scope of utility model registration request] A crankcase that rotatably supports a crankshaft; a cylinder and a cylinder head mounted on the crankcase; a locking piston forming a compression chamber between the locking piston and a fixing ring that fixes a ripple ring provided on the locking piston;
A valve chamber formed between the fixed ring and the locking piston, an intake valve formed of a flexible resin material and provided within the valve chamber, and a discharge valve provided in the cylinder head. An air compressor consisting of.