JPS5857567A - Cylinder valve - Google Patents

Abstract

PURPOSE:To decrease the inclination of a valve plate and to reduce stress of the valve plate, by inserting a guide ring provided with a guide surface having a wider width than thickness of the valve plate into a guide hole of the valve plate. CONSTITUTION:Width of a guide surface (inner circumferential surface) of a guide ring 7 is constituted larger than the thickness of a valve plate 1, and the valve plate 1 is installed on a guide part 3a of a valve bolt 3 through the guide ring 7. A gap which is naturally necessary for a smooth action of the valve plate 1 is formed between a guide surface of the guide ring 7 and the guide part 3a of the valve bolt 3, but the valve plate 1 guided by the guide part 3a without giving a little inclination is ascended or descended as the width of the guide surface of the guide ring 7 is constituted large.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder valve used in a reciprocating compressor, and is particularly suitable for a single-plate type cylinder pulp equipped with a single-plate type pulp grate.

There are many types of cylinder pulp used in reciprocating compressors, and as an example, a single-plate type cylinder valve having a guide portion will be explained with reference to FIG.

In the figure, 1 is a single plate-shaped pulp plate, and this pulp plate 1 is used during the suction or discharge stroke of the compressor.
It moves automatically due to the pressure difference between the front and back of the pulp grate. When operating pulp grade 1, pulp plate 1
It is formed on the inner diameter side or the outer diameter side and is guided by the next guide part to lift up or down. In this figure, the valve receiver 2 and the valve seat 4 are guided by a guide portion 3a formed in the pulp port 3 that connects the valve seat 4. Naturally, a gap is required between the guide hole 1a formed in the pulp plate 1 and the guide g3m, but when the pulp plate 1 is operated, the pulp plate 1 is bent by the gear. For this reason, when the pulp plate 1 collides with the valve receiver 2 and the valve seat 4, a large bending stress is applied to its outer diameter, and the stress at the corner of the fc11 section formed on the outer diameter of the pulp grate l becomes excessive. The disadvantage of meth is that it can cause cracks and lead to accidents. Also, in non-lubricated compressors,
As the pulp plate 1 and the guide portion 3a wear out due to sliding, the stiffness of the pulp plate 1 becomes even larger, which often leads to cracking accidents earlier than the original lifespan of the pulp plate 1. .

The present invention has been made based on the above-mentioned matters, and provides a 7s/dabulp which reduces the stress generated in the pulp plate by reducing the stiffness of the pulp plate and extends the life of the pulp plate. It is intended for this purpose.

The thickness of the pulp plate is determined by the thickness of the guide hole of the pulp plate and the gap between the guide grating and the guide part. The thickness of pulp grade is usually 1.2
■~4III41ii1 degree. It is not a good idea to close the gap to prevent the pulp from peeling, as this will hinder the smooth movement of the pulp plate. In addition, increasing the thickness of the guide hole of the pulp grate increases the weight of the pulp grate itself, which increases the impact force when the pulp plate collides with the valve receiver and valve seat, which has the opposite effect. Become. Therefore, in the present invention, the guide ring is inserted into the guide hole of the pulp plate, the width of the guide surface of this guide ring is configured to be larger than the thickness of the pulp plate, and the guide ring is inserted into the guide hole of the pulp plate. This object is achieved by attaching it to the guide portion of the pulp bolt.

Hereinafter, an example of the cylinder pulp of the present invention will be explained with reference to FIG. In the figure, parts given the same reference numerals as in FIG. 1 are the same parts.

In the figure, 3 is a pulp bolt connected to the valve receiver 2 and the valve seat 41, 5 is a valve spring provided on the valve receiver 2 and presses the pulp plate 1 to the valve seat 4, and 6 is the valve spring connected to the valve bolt 3. This is a nut that is screwed together and connects the valve receiver 2 and the valve seat 4 together with the valve bolt 3. 7 is a guide ring formed on the inner diameter side of the pulp plate 1 and inserted into the guide hole 1a by cold fitting etc. The width of the side surface (inner peripheral surface) of this guide ring/guar is as shown in the figure. The thickness of the plate 1 is also large, and the pulp plate 1 is attached to the guide portion 3a of the valve bolt 3 via the guide ring 7.

A gap is formed between the guide surface of the guide ring 7 and the guide portion 3a of the valve bolt 3, which is naturally necessary for smooth operation of the pulp plate l, but the width of the guide surface of the guide ring 7 is large. Due to this structure, the pulp plate 1 is guided by the guide portion 3a and lifted up or down with almost no movement.

Therefore, when the pulp plate 1 collides with the valve receiver 2 and the valve seat 4, no large bending stress is applied to the outer diameter portion thereof, and it is possible to prevent cracking accidents of the pulp plate 1 and extend its life. . Also, since the width of the guide surface of the guide ring 7 is large, the area of the guide surface is also large, so the surface pressure on the guide surface due to the self-weight of the pulp plate l is low, and the guide ring 7 and the guide Part 3
Since the wear of the guide plate 1 can be reduced, the life of the guide plate 1 can be further extended. Furthermore, since the present invention has a structure in which the guide link 7 is provided, the surface treatment or material of the kite ring 70 has no negative impact on the seat (valve seat). Guide ring 7 can be selected even if it gives l
It is possible to reduce wear and tear, and a great effect can be obtained when applied to non-lubricated compressors. Furthermore, in the present invention, the pulp plate can be reused by replacing only the guide ring 7.
It is also economically advantageous.

As explained above, the cylinder valve of the present invention is configured such that a guide link having a guide surface with a width larger than the thickness of the pulp plate is fitted into the guide hole of the pulp plate. Since the slant can be reduced and the stress generated in the pulp plate can be reduced, the life of the pulp plate can be significantly extended.

[Brief explanation of drawings]

Figure 1 is an ia sectional view showing a conventional cylinder valve;
The figure is a longitudinal sectional view showing an embodiment of the present invention. 1. Pulp plate, 1a... Guide hole, 3...
・Valve bolt, 3a...Guide part, 7...Guide ring.

Claims (1)

[Claims] In a cylinder valve equipped with a pulp plate, a guide link is inserted into the guide hole of the pulp plate, and the width of the guide surface of the guide link is made larger than the thickness of the pulp plate, and the guide link is A cylinder pulp, characterized in that the pulp plate is attached to a guide portion of a pulp bolt.