JPH039561Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a reed valve, and particularly to a reed valve that can buffer the impact force when the reed is seated.

[Prior art]

Conventionally, in this type of reed valve, in order to prevent the durability of the reed from deteriorating due to the impact force generated when the reed sits on the valve seat surface, the valve seat surface on which the reed sits is There is a device that is formed into a convex curved surface with a predetermined curvature, thereby alleviating the impact force generated when seating. Already proposed by No. 7362.

That is, this reed valve shown in FIGS. 2a and 2b includes a case complete 11 having two fluid passage holes 13, and a reed made of an elastic thin plate whose tip is divided into two by a notch. 16, and a stopper 17 whose tip side is curved upward to limit the upper limit position of the lead 16. The valve seat surface 12 of the case complete 11, in which the passage hole 13 opens, has a predetermined radius of curvature R. It is formed into a convex curved surface.

A reed 16 is located on the upper surface of the case complete 11 so as to cover the valve seat surface 12 formed therein, and the stopper 17 is located on the upper surface of this reed 16, and the rear end thereof The case complete 11, lead 16, and stopper 17 are fixed together by two screws 18 passing through the parts.

In the normal state, the case complete 11 is completed.
The fluid passage, which is the passage hole 13, is closed, and the lead swings in the vertical direction depending on the pressure difference between the fluid at the top of the diagram and the fluid at the bottom of the diagram with respect to the case complete 1. The passage hole 13 is opened and closed to allow the fluid to flow from the bottom to the top in the figure, and to prevent the flow in the opposite direction.

[Problem that the invention attempts to solve]

However, when the reed swings upward due to the force of the fluid in the passage hole and then returns to its initial state due to the biasing force stored in the reed itself, it seats on the valve seat surface. At this time, an impact force is applied to the reed, and this impact force may deteriorate the durability of the reed, especially when the reed returns after reaching the upper limit position where it contacts the stopper. In a high lift state, the impact force upon seating on the valve seat surface is large, which has the disadvantage of deteriorating the durability of the reed.

Additionally, when the reed sits on the valve seat surface, the reed may sit from its tip, but in this case too, a large impact force is applied to the reed, and the durability of the reed deteriorates. It had the disadvantage of being stored away.

Each of the above disadvantages also has the drawback that if the valve seat surface, that is, the case complete, is made of metal, there is a particularly high risk of lead breakage due to metal-to-metal contact with no buffering capacity. had.

The purpose of this invention is to eliminate the drawbacks of the conventional valves as described above, prevent the durability of the reed from deteriorating, and provide a reed valve with a long life.

[Means to solve the problem]

In order to achieve the above objective, this idea forms a valve seat surface with a sequentially concave tip with a predetermined curvature on the upper surface of the case complete, and also drills a fluid passage hole in this valve seat surface. , an elastic damper having a distal end that matches the valve seat surface and a hole that matches the passage hole is disposed on the upper surface of the case complete so as to cover the valve seat surface. , the reed valve is characterized in that an elastic thin plate reed is disposed on the upper surface of the damper, and further includes a stopper for restricting the upward position of the reed.

[Effect]

In the reed valve of this invention having the above-described configuration, when the reed is seated on the valve seat surface formed in the case complete,
When closing the fluid passage hole, the reed comes into contact with the valve seat surface of the case complete via the damper, so the impact force that is applied during this contact does not directly act on the reed. If the leads are made of metal, the impact force exerted by the leads can be greatly alleviated.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

Figures 1a and 1b show a reed valve according to this invention, which has a recessed valve seat surface 2 formed on the upper surface into a convex curved surface with a predetermined radius of curvature R.
The upper surface of the case complete 1 has an elastic thin plate, and the valve seat surface 2
A damper 4 is arranged to cover the valve seat surface 2, and has a hole 5 that matches the passage hole 3 of the damper 4 and has a size that matches the valve seat surface 2. A lead 6 is disposed on the upper surface, the lead 6 is made of a thin elastic plate, the tip is divided into two parts by a cut, and the lead 6 has a size that is almost the same as that of the damper 4. A stopper 7 whose tip is curved upward in the figure is disposed, and the rear ends of the damper 4, lead 6, and stopper 7 are integrally attached to the upper surface of the case complete 1 by screws 8 passing through them. is fixed to.

Next, the operation of the above will be explained.

First, in normal condition, each of the above-mentioned members is shown in Figure 1b.
However, when fluid acts due to the pressure difference between the upper and lower sides of the figure, the lead 6 curves upward due to the acting force, thereby causing the valve seat surface of the case complete 1 to bend. The passage hole 3 which opens into the damper 2 is opened in a state where it coincides with the hole 5 of the damper 4.

After this, when the fluid ceases to act, the lead 6 tries to return to the state shown in FIG. 1b due to the biasing force stored inside it and the positive pressure at the top of the figure when it curves upward. First, after the case complete 1 is seated on the valve seat surface 2, the state shown in FIG. 6 comes into contact with a damper 4, and the damper 4 relieves the impact force when the lead 6 is seated. That is, the damper 4 normally covers the valve seat surface 2, and the reed 6 falls downward, in other words, into a recessed part, in response to the impact of the reed 6 when seated, so the damper 4 normally covers the case complete 1. In addition to functioning as a part of the reed 6, it also functions as a cushioning material when the reed 6 is seated. Moreover, since the damper 4 is provided with the holes 5, it does not affect the flow characteristics of the fluid passing through the passage holes 3 of the case complete 1.
Lead design is easy.

In particular, the impact force of the lead 6, which appears greatly when returning to the initial state from a so-called high lift state, in which the passage hole 3 is opened while the lead 6 comes into contact with the stopper 7 and is stopped, is effectively alleviated. It is something that

It goes without saying that the damper 4, whether made of resin or metal, will provide a sufficient buffering effect as long as it has elasticity.

[Effect of idea]

By configuring this idea as described above,
The durability of the lead can be greatly improved with a very simple configuration, and since the damper is only provided as a means to improve this durability, the overall cost can be reduced.Furthermore, the damper has no holes. Since it is perforated, it does not block the fluid.
This has excellent effects such as ease of lead design.

[Brief explanation of drawings]

The drawings show the reed valve according to this invention, FIG. 1a is an exploded schematic view of the whole, and FIG.
FIG. 2a is a plan view of a conventional reed valve, and FIG. 2b is a view taken along line B-B in FIG. 2a. 1,11...Case complete, 2,12...
...Valve seat surface, 3, 13... Passing hole, 4...
Damper, 5...hole, 6,16...lead, 7,1
7...stopper, 8,18...screw.

Claims (1)

[Scope of utility model registration request] A valve seat surface 2 is formed on the upper surface of the case complete 1, and the tip thereof is successively recessed with a predetermined curvature, and a fluid passage hole 3 is bored in this valve seat surface 2. , an elastic damper 4 having a tip end that matches the valve seat surface 2 and a hole 5 that matches the passage hole 3 is disposed to cover the valve seat surface 2; A reed valve characterized in that a lead 6 made of a thin elastic plate is disposed on the upper surface of a damper 4, and further includes a stopper 7 for restricting the upward position of the lead 6.