JPH0144862Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a reed valve used in a secondary air introduction device for automobile exhaust gas control, an intake valve of a two-stroke engine, and the like.

(Prior Art) As shown in FIG. 3, for example, in a conventional reed valve, a reed 103 made of an elastic thin plate is attached to a plate-shaped valve body 102 having a ventilation hole 101.
It is attached to one side of 2. Valve body 10
On the mounting surface of the lead 103 of No. 2, there is a
A sheet 104 made of an elastic material such as rubber is attached to the valve body 102 in order to absorb the impact caused by the lead 103 to the periphery of the opening of the vent hole 101 when the valve is closed.
It was integrally bonded to the reed valve, increasing the durability of the reed valve.

(Problem to be solved by the invention) However, in the case of such a conventional example, the valve body 102
The sheet 1 is placed on the stepped portion 102a formed around the opening of the
04 is assembled and glued together, but due to variations in the size of this lead 103, lead 1
When the outer periphery of the seat 103 extends beyond the outer periphery of the seat 104, the reed 103 directly hits the valve body 102, which causes a problem in that the impact upon seating is not effectively absorbed. For this reason, high precision is required in the machining of the stepped portion 102a and the seat 104 provided on the valve body 102, leading to an increase in the cost of the reed valve.

Therefore, it is known that instead of the sheet 104 of elastic material, aluminum or resin having a low elastic modulus is used to absorb the impact of the lead 103 when the seat is seated. However, seats made of aluminum or the like have low strength, and if the reeds 103 are opened to a large extent, they cannot absorb the impact when the seat is seated, and there is a risk of damage, resulting in poor durability.

It is also known that the entire surface of the reed 103 is coated with an elastic material such as rubber to absorb the impact with the valve body 102 when the reed 103 is seated. If the elastic material is thin, it may be damaged by impact, so the elastic material must be thick. However, when the elastic material is made thicker, the rigidity of the reed 103 increases, changing the characteristics of the reed valve, and there are drawbacks such as the degree of opening of the reed at a given pressure becomes smaller than that without coating with the elastic material.

The present invention was devised to solve the problems of the prior art, and its purpose is to:
To provide a reed valve capable of absorbing as much impact as possible when the reed is seated without changing the rigidity of the reed, and to reduce costs by facilitating the manufacture of the valve body.

In order to achieve the above object, the present invention provides a reed valve having a valve body having a vent hole, and a reed made of an elastic thin plate attached to the valve body for opening and closing the vent hole. A buffering elastic body was attached to the contact portion with the valve body, and a groove was provided in the valve body to receive the buffering elastic body.

(Example) The present invention will be explained below based on the illustrated example. In FIG. 1 showing a reed valve according to an embodiment of the present invention, reference numeral 1 designates a plate-shaped valve body having a vent hole 2, and one side of the valve body 1 has an elastic material for opening and closing the vent hole 2. A lead 3 made of a thin plate is attached. One end of the lead 3 is fixed to the valve body 1 by a screw 4, and a curved stopper 5 for controlling the opening degree of the lead 3 is attached to overlap the lead 3. The configuration up to this point is the same as the conventional example shown in FIG.

In the present invention, a buffering elastic body 6 such as rubber is attached to the tip of the reed 3 that comes into contact with the valve body 1. That is, the groove 6 provided in the buffer elastic body 6
The tip of the lead 3 is inserted into the hole a and fixed with adhesive or the like. On the other hand, a groove 7 is formed in the valve body 1 at a position corresponding to the buffering elastic body 6, so that the buffering elastic body 6 enters into the groove 7 when the reed 3 is seated. Lead 3 of buffering elastic body 6
The thickness of the lower end side is approximately the same as the depth of the groove 7.

In the above configuration, the reed valve is installed in the flow path with the side to which the reed is attached facing downstream. When the pressure on the upstream side becomes higher than the pressure on the downstream side, the reed 3 is pushed downstream due to the pressure difference, the vent hole 2 opens, and fluid flows from the upstream side to the downstream side. Although the opening amount of the reed 3 changes depending on the pressure difference, it is balanced with the pressure difference by the elastic restoring force of the reed 3 corresponding to the opening amount. When the pressure difference is large, the opening amount of the reed 3 becomes large, and the reed 3 hits the stopper 5, so that the opening amount is limited. When lead 3 hits stopper 5,
The impact of the lead 3 on the stopper is absorbed by the buffering elastic body 6 at the tip.

When the pressure difference between the upstream and downstream sides disappears, or when the pressure on the upstream side becomes smaller than that on the downstream side, the reed 3 seats on the valve body 1 due to its elastic restoring force and passes through the valve body 1. Close stomata 2. At this time, the buffering elastic body 6 provided at the tip of the lead 3 hits the bottom surface of the groove 7, and the shock is absorbed by the buffering elastic body 6, thereby absorbing the shock when the lead 3 is seated. Since the buffering elastic body 6 is attached to the tip of the reed 3 where the moving speed is fastest and the impact is large, the impact can be absorbed by the valve body 1 of the reed 3 most efficiently. Further, the buffering elastic body 6 enters into the groove 7, and the lead 3 is brought into airtight contact with the edge of the vent hole 2, completely closing the vent hole 2.

In the above embodiment, the buffer elastic body 6 is attached to both the upper and lower surfaces of the lead 3.
As shown in FIG. 2, it may be attached only to the lower surface side of the lead 3.

Further, in this embodiment, the buffer elastic body 6 is attached to the tip of the reed 3, but it is not limited to the tip, and may be any part of the reed 3 that comes into contact with the valve body 1. Moreover, it may be provided not only at one location but at multiple locations.

(Effects of the invention) The invention consists of the above structure and operation,
The impact of the reed on the valve body is absorbed by the shock absorbing elastic body provided on the reed, resulting in a reed valve with excellent durability.In addition, since there is no elastic seat on the valve body, it is easy to install the seat. There is no need to process the stepped portion, and the number of man-hours can be reduced, and the cost of the reed valve can be reduced. Furthermore, instead of coating the entire surface of the reed with an elastic material as in the past, a cushioning elastic material is attached to a portion of the reed, so the rigidity of the reed does not change significantly and the characteristics of the reed valve do not change. . In addition, since a groove is provided in the valve body for the buffer elastic body to fit into, the lead can be brought into close contact with the valve body when the valve is closed, ensuring sealing performance when the valve is closed. Effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a reed valve according to one embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of a reed valve according to another embodiment of the present invention, and FIG. 3 is a vertical cross-sectional view of a conventional reed valve. It is a diagram. Explanation of symbols, 1...Valve body, 2...Vent hole, 3
...Lead, 5...Stopper, 6...Buffering elastic body, 7...Groove.

Claims (1)

[Scope of utility model registration request] In a reed valve having a valve body having a vent hole, and a reed made of an elastic thin plate attached to the valve body to open and close the vent hole, a buffering elastic body is attached to the contact portion of the reed with the valve body. The reed valve is also characterized in that the valve body is provided with a groove into which a buffering elastic body is inserted.