JPH0314611Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a reed valve.

[Conventional technology]

Conventionally, as shown in FIG. 3, a reed 3 for opening and closing the valve hole 2 and a stopper 4 for regulating the valve opening angle of the reed 3 have been attached by screws 5 to one side of a case 1 having a valve hole 2 bored therein. Reed valves are widely known which are formed by polymer attachment in a cantilevered manner and allow fluid to flow only in the direction A in the figure. A rubber sheet 6 is vulcanized and adhered to the reed 3 mounting surface of the case 1 so as to surround the valve hole 2 in order to increase the sealing force when the valve is closed and to reduce the impact force when the reed 3 is activated. This rubber sheet 6 should have a thickness of about 1.0 mm at the part where the tip of the lead 3 seats (right side in the figure) and 0.1 mm or more at the part where the base of the lead 3 seats (left side in the figure) to provide sufficient cushioning. function, the valve hole 2
It is vulcanized and bonded to the recess 8 formed around the .

[Problem that the invention attempts to solve]

In the process of vulcanizing and adhering the rubber sheet 6 in the recess 8, the recess 8 needs to have a depth of 0.3 to 0.5 mm in actual size in order to stably rotate the rubber material during vulcanization. If this thickness is set for all of the base side of the lead 3 in , a gap will be created between the rubber sheet 6 and the lead 3 after the lead 3 is assembled due to rubber contraction after vulcanization, resulting in a back pressure leak. In order to reduce this gap, the rubber sheet 6 is
Even if the elevation angle θ is about 5 degrees, this cannot be completely solved, and there are problems such as an increase in reed valve opening pressure.

In order to deal with this problem, as shown in FIG. 4, in the past, instead of surrounding the entire circumference of the valve hole 2 with a rubber sheet 6, a rubber sheet was placed only on the tip of the reed 3 where the impact force was large when the valve was closed. However, the shaded area where the case 1 and the lead 3 are in direct contact must be additionally processed after vulcanization, which is time-consuming.

[Means for solving problems]

In view of the above-mentioned circumstances, the purpose of this invention is to improve the sealing performance of the case-complete, non-polishing type reed valve shown in Figure 3.To achieve this purpose, a valve hole is bored. A reed valve having a case, a rubber sheet vulcanized and bonded to a recess formed around the valve hole, and a reed fixed to the case and opening and closing the valve hole by coming into contact with and separating from the rubber sheet. , grooves extending vertically and horizontally are formed at the bottom of the lead base side portion of the recess.

[Effect]

In the reed valve described above, when the rubber sheet is vulcanized and bonded to the case, the rubber material flows in a thin layer over the entire bonding surface along the grooves.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings.

As shown in Figures 1 and 2, the portion of the base of the lead 3 in the recess 8 of the case 1 is not shown in actual size.
A shallow concave surface of about 0.1 to 0.2 mm is formed, and the bottom surface has a flat comb shape with a width of about 1 mm and a depth of about 0.5 mm2.
Case 1 so that the book grooves 7 and 7 do not cross each other
are formed alternately in the width direction, and during vulcanization,
The rubber material flows along the grooves 7, 7 and spreads over the entire surface of the bonding surface on the base side of the leads 3, forming a thin rubber sheet 6.

The above-mentioned reed valve is constructed so that the root side portion of the rubber sheet 6 is made thinner to suppress the amount of rubber contraction after vulcanization and to increase the sealing force in this portion. The elevation angle θ' in the direction can also be kept to a narrow angle of 1 degree or less, and the valve opening pressure can be reduced. The grooves 7, 7 are provided by die casting.

[Effect of idea]

As explained above, the reed valve of this invention has
Grooves are formed in the case to improve the flow of the rubber material, forming a thin rubber sheet that was previously considered impossible, reducing the amount of rubber shrinkage after vulcanization and improving sealing performance. , there is no need to set a large elevation angle that would cause an increase in valve opening pressure. Further, according to the present invention, since the case and the rubber sheet engage with each other in the recess, it is possible to prevent the rubber sheet from peeling off from the case.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a case according to an embodiment of the reed valve of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view of a reed valve according to a conventional example, and Fig. 4 is a sectional view of a case according to another conventional example. It is a top view of the case of such a reed valve. 1...Case, 2...Valve hole, 3...Lead, 4
...Stopper, 6...Rubber sheet, 7...Groove, 8
...Concavity.

Claims (1)

[Scope of utility model registration request] A case 1 with a valve hole 2 formed therein, and a rubber sheet 6 vulcanized and bonded to a recess 8 formed around the valve hole 2.
and the rubber sheet 6 is fixed to the case 1.
A reed valve having a reed 3 that approaches and separates from the valve hole 2 to open and close the valve hole 2, characterized in that a groove 7 extending vertically and horizontally is formed at the bottom of the base side of the reed 3 in the recess 8.