JPS59206687A - Reciprocating compressor - Google Patents

Abstract

PURPOSE:To promote a suction valve to obtain a high pressure and simplify its construction and mounting work, by utilizing a groove or a tapered surface of a piston to mount the suction valve and eliminating a structure protruded to an upper part of the suction valve so as to decrease the inside volume of cylinder after compression. CONSTITUTION:The end face of a piston part 2a holds a suction valve 3 by inserting its plural claw parts 3a into a groove 2c provided in the piston part 2a. Then at a suction stroke, a seat part 3b of the suction valve 3 is opened upward, allowing air to flow in a suction filter 30 and to be introduced from the atmosphere. Here the suction valve 3, being hooked to the groove 2c in the piston part 2a by the claw part 3a, opens upward only the seat part 3b, and if again into a compression stroke, the seat part 3b of the suction valve 3 is adapted to the end face of the piston part 2a, disconnecting a compression chamber 22 from a suction passage 2d. By such constitution, eliminating any structure protruded from an upper part of the suction valve 3 and decreasing its volume after compression, a high pressure can be obtained and the construction of the valve and its mounting can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small-sized, low-flow reciprocating compressor, which is effective when used as a mechanical pump, for example.

Conventionally, in a reciprocating compressor in which the suction valve is mounted on a screw, the suction valve is fixed to the top of the piston by screws or other means, but this method requires more man-hours to assemble. A convex part appears on the piston, increasing the volume at top dead center,
There are drawbacks such as not being able to obtain high pressure.

Therefore, it is an object of the present invention to provide a reciprocating compressor which can obtain high pressure and has a suction valve with a simple structure.

A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross section of a reciprocating compressor, and FIG. 2 shows a cross section taken along line A--A in FIG.

In the figure, reference numeral 1 denotes a housing made of aluminum, and the housing 1 is provided with a cylinder portion 1a, and a cooling fan 1b is provided on the outside thereof. Reference numeral 2 designates a locking piston in which a piston portion 2a and a connecting rod portion 2b are integrally molded, and a screw I/n portion 2a is provided on the inner periphery of the cylinder portion 1a. A suction valve 3 is provided on the end face of this piston portion 2a.
Alternatively, a plurality of (four in this example) claws 3a of the suction valve are inserted into grooves 2c (FIG. 3) provided in the piston portion 2a. (Fig. 3 shows the screw (n4 degree narrowness of the screw part 2a).) The piston part 2a is provided with a suction passage 2d, and the seat part 3b of the suction valve 3 is connected to the suction passage 2d.
I'm trying to open and close it.

Further, a piston ring 4 and an O-ring 5 are disposed on the piston portion 2a, and a seal is formed between the piston portion 2a and the cylinder portion 1a.

In addition, a bearing 6 is fixed to the stove throat portion 2b of the locking piston 2, and is mounted on the crankshaft 7 to prevent movement in the axial direction.
There are several dents on the outside of a. 7b is a balance weight part integrally molded on the crankshaft 7,
This is to adjust the an/s4 lance that occurs during the reciprocating movement of the mouth/knocking piston 2, etc. The mouth/knocking piston 2 and crankshaft 7 are both made of aluminum to reduce weight.

Reference numeral 8 denotes a drive shaft of the electric Tanabata 10, and an end portion of this shaft 8 is integrally molded with a flip-up portion 8a and a two-sided portion 8b. Then, it is fitted with the two-sided part provided on the crankshaft 7, and the nano l-
9, the crankshaft 7 is fixed to the drive shaft 8.

Also, a hair ring 6 fixed to the mouth/knocking piston 2
The cap 7C of the crankshaft 7 that fits into the drive shaft 8 has a predetermined eccentricity.The electric motor section 10 is composed of an armature (not shown) fixed to the drive shaft 8, a magnet throat (not shown), etc. There is.

The housing 1 and the holder 11 are fixed to the housing 12 of the electric motor 10 by tapping screws (not shown). Reference numeral 13 denotes an oil-impregnated bearing that rotatably holds the drive shaft 8, which is held by a retainer 14, and an oil-impregnated bearing 15 that holds oil is disposed around the outer periphery of the oil-impregnated bearing 13. A spacer 16 is disposed between the commutator 17 and the oil-impregnated bearing 13 to prevent the drive shaft from moving in the axial direction. 1
Reference numeral 8 denotes an O-ring held in the housing 1 to prevent dirt and water from entering the crank chamber 19 from the outside.

20 is a discharge valve, and this discharge valve 20 is in contact with the housing 1 at the seat surface IC, and is pressed against the seat surface IC by a spring 21. Reference numeral 1d denotes a discharge hole, which communicates with a compression chamber 22 formed by the cylinder portion 1a and the end surface of the locking piston 2. 23 is a stopper that covers the upper surface of the discharge valve 20 and the spring 21 and is sealed by an O-ring 24;
- It is fixed by a clip 25. The IC is a discharge nipple provided in the housing and is connected to other devices by a screw 1f.

21) is a cover that covers the crank chamber, and is fixed to the housing 1 together with a gasket 28 by machine screws 27.

2a is a bush that covers the lower surface of the housing 1, and is made of elastic rubber.A suction filter 30 is held in the bush 29 by adhesive, and the crank chamber 19 and the engine are communicated via this suction filter 30. are doing.

This suction filter is square-shaped so as to be positioned below when the reciprocating compressor is installed, to prevent water from entering.

Next, the operation of the compressor having the above configuration will be explained.

When the electric motor section 10 is energized, the drive shaft 8 rotates, and the crankshaft 7, which is eccentrically fixed to the drive shaft 8, causes the bearing 6 fixed to the connecting rod section 2b of the locking piston 2 to rotate around the drive shaft 8. Rock and rotate. The piston portion 2a of the locking piston 2 holding the piston ring 4 reciprocates along the inner periphery of the cylinder portion 1a of the housing 1 in response to this rocking rotation.

As a result, the discharge valve 20 opens during the compression stroke (compression chamber volume is small), and compressed air is supplied from the discharge nipple 1e to other devices. Next, during the suction stroke, the compression chamber 22 becomes a negative pressure, so the seat portion 3 of the suction valve 3 opens upward, and the suction filter 3
Air is introduced from the atmosphere through 0. Here, suction valve 3
Since the claw portion 3a is caught in the groove portion of the piston portion 2C, only the seat portion 3b opens upward.

Then, when moving again to the compression stroke, the seat portion 3 of the suction valve 3
a comes into contact with the end surface of the piston portion 2a and blocks communication between the compression chamber 22 and the suction passage 2d.

Next, a second embodiment of the present invention will be described based on FIG. 4.

40 is a locking piston, and a claw portion 41 of a suction valve 41 is inserted into a groove portion 40b that holds the piston ring 4 and O-ring 5.
a has been inserted. And this claw n1ζ41a is the first
As in the embodiment, there are a plurality of them.

Next, a third embodiment of the present invention will be explained based on FIG. 5 and FIG.

FIG. 5 shows a cross section of the locking piston, and FIG. 6 shows its external view.

The piston portion 50a of the one-knotting screw I/N 50 is provided with a tapered portion 50b. Reference numeral 51 denotes a suction valve, which has a tapered portion 51a that is slightly larger than the piston portion 5a;
A plurality of (two in this example) notches 51b are provided to facilitate attachment to the piston portion 50a.

+ii+ In the first, second, and third embodiments described above, there is no claw on the suction valve.
It has a li or tapered part and is pushed into the piston part, or a tap-shaped suction valve is placed over the piston part S M
It is also possible to hold it by hand. In this case, the portion to be tightened may be the entire circumference or only partially.

In the first, second, and third embodiments described in i'+il, the material of the locking piston is aluminum to reduce weight.
In the first, second, and third embodiments, the suction valve covers the entire screw portion, but it may partially cover the screw portion.

In the first, second, and third embodiments, the locking piston is described in which the piston and the stove are integrated, but it goes without saying that they can also be applied to a case where the piston and the stove are separate, as is commonly used. .

Further, in the first, second, and third embodiments, the groove or tapered surface of the piston portion is provided all around the circumference, but it may be provided only in the portion corresponding to the pawl or tapered surface provided on the suction valve.

As described above, in the present invention, since the suction valve is mounted using the groove or tapered surface of the piston, a high compression ratio can be obtained because there is nothing protruding from the top of the suction valve. In other words, the volume after compression can be reduced, and installation can also be simplified.

[Brief explanation of the drawing]

Figures 1 to 3 are a partial sectional view of a compressor showing a first embodiment of the present invention, a plan view of the top of the piston, and a sectional view of the top of the piston, and Figure @4 is a cross-section of the top of the piston of the second embodiment. Figures 5 and 6 are a sectional view and a front view of the top of the screw 1 showing the third embodiment.

Claims (1)

[Claims] In a reciprocating compressor that has a screw part that reciprocates within the cylinder part and a sheet-like suction valve at the top of the piston part described in iii. 4. A reciprocating compressor, wherein the reciprocating compressor is held by engaging a portion of the suction valve with a surface.