JPH0220544Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mechanism for canceling the check valve function in a reed valve disposed in a fluid flow path of various devices.

[Conventional technology]

2. Description of the Related Art Conventionally, a reed valve shown in FIG. 3 has been widely used as a reed valve that is used in equipment such as a compressor and has a mechanism for canceling its function as a check valve.

That is, the cross-sectional shape is approximately V-shaped, and a communication hole 1 is formed in the mutually diagonal inclined parts, and a lead 2 made of an elastic thin plate is inserted into the outer surface 3 of the inclined part so as to close the communication hole 1. A case 4 attached with a cantilever structure to the pump chamber 5 is fixedly installed on the suction side of the pump chamber 5, allowing the flow of fluid from the suction pipe 6 toward the pump chamber 5, and blocking the flow in the opposite direction. and 7 is a bypass flow path which communicates the suction pipe 6 with the pump chamber 5 and is provided with a stop valve 9 operated by an actuator 8;
10 is a piston that reciprocates within a cylinder 11 communicating with the pump chamber 5.

In the above configuration, usually the bypass flow path 7
When the piston 10 moves downward in the drawing in the cylinder 11 with the stop valve 9 closed, the pressure inside the pump chamber 5 becomes low, so the reed 2 is pushed open and the fluid flows into the cylinder 11. When fluid flows in from the suction pipe 6 (in the direction of the arrow in the figure) and the piston 10 moves upward in the cylinder 11 in the figure, the pressure in the pump chamber 5 becomes high, so the lead 2 It returns to its original state due to pressure and its own elasticity, and blocks the communication hole 1, and pumping is performed by continuously repeating this operation.

In addition, in an operating range that does not require the supply of highly compressed fluid, the stop valve 9 is opened to open the bypass flow path 7, thereby canceling the check valve function of the lead 2 and stopping pumping. It's suppressed.

[Problem that the invention attempts to solve]

However, according to the above configuration, if the bypass flow path 7 is designed to have a large diameter, the stop valve 9 will naturally also have a large diameter, and during normal operation, pressure fluctuations in the pump chamber 5 due to the operation of the piston 10 will cause the stop valve 9 to have a large diameter. 9, the bypass flow path 7 is designed to have a small diameter. For this reason,
Even when the stop valve 9 is opened and the check valve function by the reed 2 is released, the flow resistance in the bypass flow path 7 is large, and therefore the load on the piston 10 and the drive source (not shown) increases. Furthermore, since the above-mentioned configuration requires the bypass flow path 7, there is a problem in that extra space is required.

The present invention has been made in view of the above problems and for the purpose of solving them.

[Means for solving problems]

In order to achieve the above object, the check valve function release mechanism of the reed valve of the present invention has a substantially V-shaped cross section,
A case in which a communication hole is formed in inclined surfaces that are diagonal to each other, and a lead attached to the inclined surface that allows fluid to pass through the communication hole in only one direction is reciprocated by a device such as an actuator. The valve seat is fixed to a rod, and when the rod is operated, it is configured to be seated on and removed from a valve seat formed in the piping flow path.

[Effect]

When it is necessary to supply highly compressed fluid during the operation of equipment, the case is seated and brought into close contact with the valve seat by actuating the actuator or other device, thereby providing the reed valve with a check valve function. A function is provided that allows fluid to flow in only one direction through the lead.

In addition, in an operating range that does not require the supply of highly compressed fluid, the case is moved away from the valve seat by the actuation of the actuator or other device, and the gap created by this separation is used to prevent the check valve of the reed. This is to cancel the function as. In this case, since the void is formed all around the four sides, it is possible to form a wide flow path even if the actuator or other device operates with a small stroke.

〔Example〕

Next, a preferred embodiment of the check valve function release mechanism of the reed valve of the present invention will be described based on the drawings.

That is, the cross-sectional shape is approximately V-shaped, and a ventilation hole 11 is formed in the mutually diagonal inclined parts, and the lead 1 made of an elastic thin plate is formed so as to close the ventilation hole 11.
2 is attached to the outer surface 13 of the inclined portion in a cantilever structure, and the case 14 is screwed 17 to a rod 16 that is reciprocated by an external actuator 15.
The valve seat plate 19 is disposed inside the flow path 18 so as to be able to sit on and leave the valve seat plate 19 formed in the flow path 18 . The valve seat plate 19 is provided with ventilation holes 20, 20, a bead 21 made of an elastic material is provided around the valve seat plate 19 in a close contact area of the case 14, and a shaft hole 22 is provided. The shaft hole 22 allows the rod 1
6 is slidably supported on the shaft. 23 is cylinder 2
4 is a piston that reciprocates within the piston by a drive source (not shown).

The present embodiment is constructed as described above, and in an operating region that requires the supply of highly compressed air, the actuator 15 is actuated to seat the case 14 on the bead 21 of the valve seat plate 19, as shown in FIG. By bringing the piston 23 into close contact with the cylinder 24 of the piston 23, similar to a normal reed valve,
Due to the reciprocating action within, only the flow in the direction of the arrow in the figure is induced, and pumping is performed.

In addition, in an operating region that does not require the supply of highly compressed air, the actuator 15 operates to cause the case 14 to move as shown in FIG.
is separated from the bead 21 of the valve seat plate 19. That is, since the right side space A of the case 14 and the left side space B (pump chamber) communicate with each other through the air gap 25 formed by the ventilation hole 11 and the above-mentioned stand, the reciprocating movement of the piston 23 causes the two spaces to be connected to each other. Changes in the pressure difference between A and B are suppressed, and the check valve function of the reed 12 is released.

[Effect of idea]

As described above, the check valve function release mechanism of the reed valve of the present invention allows the case itself, to which the reed is attached, to freely sit on and off the valve seat formed in the flow path by the operation of an actuator, etc. Since the function of the reed valve as a check valve is canceled by removing the case from the valve seat, the function of the reed valve as a check valve is canceled, so that the function of the bypass flow path as in the conventional check valve function canceling mechanism is eliminated. This contributes to cost reduction by eliminating the need for new installation, and when the check valve function is released, a wider flow path is formed compared to the conventional bypass flow path, which reduces flow resistance and reduces the load on the drive source. The practical effects of the present invention are extremely large, such as reducing the

[Brief explanation of the drawing]

FIGS. 1 and 2 are sectional views showing an embodiment of the present invention in use, and FIG. 3 is a sectional view showing a conventional example in use. 11, 20...Vent hole, 12...Lead, 14
...Case, 15...Actuator, 16...
Rod, 18...flow path, 19...valve seat plate.

Claims (1)

[Scope of utility model registration request] At least a pair of communication holes are formed in inclined surfaces that are approximately V-shaped in cross section and are diagonal to each other, and a lead that allows fluid to pass through the communication holes in only one direction is attached to the inclined surface. The case is fixed to a rod that reciprocates by a device such as an actuator, and is configured to sit on and leave a valve seat formed in a piping flow path by the operation of the rod. Reed valve check valve function release mechanism.