JP2585780Y2 - Reciprocating gas compressor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating gas compressor.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional reciprocating gas compressor developed by the present applicant. This reciprocating type gas compressor includes a piston 102 disposed reciprocally in a cylinder 101 and a discharge chamber block 103 disposed at an upper end of the cylinder 101. In the peripheral wall 104a of the piston 101, a plurality of intake ports 105 are scattered at regular angular intervals in the circumferential direction of the peripheral wall 104 of the piston 101, and are formed so as to penetrate the peripheral wall 104 in the radial direction of the piston 101.

An annular ring mounting groove 106 having a V-shaped bottom surface is formed at a portion where the intake port 105 opens at the outer peripheral portion of the piston 101. Ring mounting groove 106
, A D-shaped rubber elastic seal ring (hereinafter, referred to as a D ring) 107 is mounted. In this case, the curved portion of the D-shaped cross section is attached to and detached from the V-shaped bottom surface of the D-ring mounting groove 106. Thus, the D ring 107 and the ring mounting groove 1
The V-shaped bottom surface of 06 constitutes the intake valve 109.

[0004] The atmosphere is a hollow portion 1 inside the piston 104.
08 and the intake valve 109, a compression chamber 110 formed in the cylinder 101 above the piston 104.
Is introduced to When the compression chamber 110 is in a negative pressure state (that is, when the atmospheric pressure in the hollow portion 108 of the piston 104 is higher than the internal pressure of the compression chamber 110) during the downward stroke of the piston 102, the intake valve 109 In an open state against the elasticity of On the other hand, when the internal pressure of the compression chamber 110 is higher than the atmospheric pressure in the hollow portion 108 during the stroke in which the piston 102 rises, the differential pressure between the hollow portion 108 and the compression chamber 110 and the elastic force of the D ring 107 In a closed state.

When the piston 102 rises, the compression chamber 1
When the internal pressure of 10 exceeds a certain pressure, the discharge reed valve 111 opens, and the compressed air is discharged from the compression chamber 110 to the discharge chamber 113 in the discharge chamber block 103 through the discharge port 112 in the crown of the cylinder 101. . The compressed air in the discharge chamber 113 passes through an outlet 114 and passes through an accumulator (not shown).
Sent to

[0006]

In the reciprocating type gas compressor, since the air is repeatedly compressed, the temperature of both the piston 102 and the cylinder 101 rises to a considerable temperature.
7 also softens under the influence of heat as the temperature rises. As a result, when the internal pressure of the compression chamber 110 becomes a negative pressure in the process of lowering the piston 104 and the intake valve 109 opens, the diameter of the D-ring 107 increases and the D-ring 107 comes into contact with the wall surface of the cylinder 101 and may be fixed. . At this time, since the piston 104 is descending, the D-ring 107 is interposed between the outer peripheral surface of the piston 104 and the wall surface of the cylinder 101, and the intake port 10
The effective cross-sectional area of the air passage from 5 to the compression chamber 110 is reduced. For this reason, the flow velocity of the air passing through this air passage increases, and the intake noise increases. The purpose of this invention is
An object of the present invention is to provide a reciprocating gas compressor that prevents the D-ring 107 from sticking to the wall surface of the cylinder 101 and prevents the intake noise from increasing.

[0007]

According to the present invention, there is provided a piston body having a hollow portion serving as an intake passage and having an outer diameter substantially equal to the inner diameter of a cylinder, an annular ring connected to a crown portion of the piston body and formed on an outer peripheral portion thereof. A piston crown having a mounting groove,
A piston extending radially through the peripheral wall of the piston crown and having a piston crown having an intake hole connecting the hollow portion of the piston body and the ring mounting groove, and a ring mounting groove mounted in the ring mounting groove. In a reciprocating type gas compressor including a rubber elastic seal ring forming an intake valve in cooperation with a bottom portion, the piston crown has an outer diameter smaller than the outer diameter of the piston body and the intake valve is open. The outer peripheral portion of the rubber elastic seal ring is formed to have an outer diameter that does not contact the wall surface of the cylinder, and the upper cylinder wall 9 forming the crown of the cylinder 2 is raised
The shape of the upper end of the piston 3 including the crown 4 and the shoulder 8
It is characterized in that it is formed in a stepped shape .

[0008]

According to the present invention, the rubber elastic seal ring does not come into contact with the cylinder wall when the intake valve is open even if the rubber elastic seal ring is softened due to the thermal effect of gas compression. For this reason, when the piston is in the descending stroke, the rubber elastic seal ring in the open state also descends with the piston, and the effective cross-sectional area of the intake passage formed by the rubber elastic seal ring and the bottom of the ring mounting groove is smaller than that of the conventional piston. In comparison with the reciprocating type gas compressor.
Therefore, the flow velocity of the air passing through the intake passage does not increase, and generation of high intake noise is prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to FIG. The reciprocating air compressor 1 according to one embodiment of the present invention includes a cylinder 2 and a piston 3. Although the discharge reed valve and the discharge chamber block are not shown in FIG. 1, the configuration and operation of the discharge reed valve and the discharge chamber block are the same as those of the conventional reciprocating gas compressor.

The outer diameter of the crown 4 of the piston 3 is set to be considerably smaller than the outer diameter of the main body 3a of the piston 3. A plurality of air intake holes 5 are provided at predetermined angular intervals in the circumferential direction of the crown 4 so as to penetrate the circumferential wall 4a of the crown 4 in the radial direction. These intake holes 5 are formed by the piston 3
An annular ring mounting groove 6 is formed at a portion opened at the outer peripheral portion of the crown 4. The intake hole 5 connects the hollow portion 10 serving as an intake passage and the ring mounting groove 6. The ring mounting groove 6 has a V-shaped bottom surface.
A ring 7 is mounted. The bottom surface of the D ring 7 and the ring mounting groove 6 constitute the intake valve 11.
Since the outer diameter of the D-ring 7 is considerably smaller than the inner diameter of the cylinder 1, the D-ring 7 does not come into contact with the wall surface of the cylinder 1 even when expanded in the radial direction with the intake valve 11 opened. Therefore, the D-ring 7 expanded in the radial direction
Does not adhere to the wall surface of the cylinder 1 even if it is softened by the influence of heat. An annular shoulder 8 is formed between the crown 4 of the piston 3 and the main body 3a.

According to the shape of the upper end of the piston 3 including the crown 4 and the shoulder 8, the cylinder upper wall 9 forming the crown of the cylinder 2 is also formed as a hollow stepped disk. When the piston 3 rises to the top dead center, the crown 4 of the piston 3 is inserted into the central convex portion 9a of the cylinder upper wall 9, and the shoulder 8 of the piston 3 becomes the shoulder 9b of the cylinder upper wall 9.
To a level that leaves a small gap. Thus, there is no dead space between the piston 3 and the cylinder 1 that does not contribute to compression. For this reason, the compression efficiency of the reciprocating gas compressor of the present invention does not decrease as compared with the conventional reciprocating gas compressor.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a reciprocating gas compressor according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a conventional reciprocating gas compressor.

[Explanation of symbols]

 Reference Signs List 2 cylinder 3 piston 3a piston body 4 piston crown 4a peripheral wall of piston crown 5 intake hole 6 ring mounting groove 7 D ring (rubber elastic seal ring) 10 hollow portion 11 intake valve

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mitsuyasu Takatsuru 6-6, Hakozakicho, Nihonbashi, Chuo-ku, Tokyo Inside Max Corporation (56) References JP-A-5-332249 (JP, A) (58 ) Field surveyed (Int. Cl. ⁶ , DB name) F04B 39/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A piston body having an outer diameter substantially equal to the inner diameter of a cylinder and having a hollow portion serving as an intake passage, and a piston crown connected to a crown of the piston body and having an annular ring mounting groove on the outer periphery. A piston extending radially through the peripheral wall of the piston crown and having a piston crown having an intake hole connecting the hollow portion of the piston body and the ring mounting groove; and a ring mounted in the ring mounting groove. In a reciprocating gas compressor including a rubber elastic seal ring forming an intake valve in cooperation with the bottom of the mounting groove, the piston crown has an outer diameter smaller than the outer diameter of the piston body, and the intake valve has The outer peripheral portion of the rubber elastic seal ring in the opened state is formed so as to have an outer diameter that does not contact the wall surface of the cylinder.
The cylinder upper wall 9 forming the crown portion 2 is connected to the crown portion 4 and the shoulder portion.
To the shape of the upper end of the piston 3 including the formation 8
A reciprocating gas compressor characterized by having a stepped shape .