JPS60530Y2 - check valve device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a check valve device provided at the confluence of a flow path and its branch path.

FIG. 1 shows a conventional check valve used when feeding oil from a branch pipe 6 of a high-pressure hydraulic system to a main pipe 5.

This check valve consists of a valve body 1, a valve member 2, a coil spring 3, and a stopper 4, and the supply pressure increases due to the oil pressure in the main pipe 5 and the elastic force of the coil spring 3 pressing the valve member 2. When the valve member 2 is opened, the valve member 2 moves to open the valve.

However, in this check valve, the supply oil does not flow uniformly into the main pipe 5, which causes turbulence and causes the valve member 2 to sag, which ultimately leads to damage to the seat portion of the valve member.

In addition, in order to obtain a valve opening area commensurate with the cross-sectional area of the main pipe 5,
There are drawbacks such as the need for a considerably large check valve.

In view of the above drawbacks, the present invention allows the supply fluid from the branch passage to uniformly flow in from the circumferential direction of the passage, prevents turbulence, prevents the valve member 2 from dancing, and reduces the valve opening area. It is an object of the present invention to propose a check valve device that does not increase the size of the device even if the area is commensurate with the cross-sectional area of a road and a branch road.

For this reason, the present invention provides a check valve device that is installed at the confluence of a straight main flow path and a branch path that intersects with the main flow path and controls opening and closing of the main flow path and the branch path. An annular recess is carved in the surface, the branch passage is connected and opened in the recess, and the fluid pressure in the recess exceeds the elasticity of the elastic member when pressed by a valve seat provided between the main passage and the main passage. The gist is that when the valve member communicates the branch passage with the main passage, the valve member is slidably fitted in the flow direction of the main passage.

The check valve device of the present invention has the above-mentioned bark, so that when the valve member is opened by the supply fluid pressure from the branch passage, the supply fluid is uniformly distributed from the concave portion into the passage from the entire circumference direction. Since the valve flows in, turbulence does not occur and the valve member can be prevented from swinging, which in turn prevents damage to the seal part of the valve member, and the valve opening area can be increased, which has the effect of not increasing the size of the device. be.

Next, an embodiment of the device according to the present invention will be explained based on FIG.

The check valve device in this embodiment supplies high-pressure hydraulic oil to a branch pipe 1.
Branch pipe 11 of the piping system that supplies from 1 to main pipe 10 and main pipe 1
It is installed at the junction with 0.

Reference numeral 7 denotes a valve body interposed in the main pipe 10, which has an annular recess 12 carved in its inner peripheral surface forming a part of the flow path, and a branch pipe 11 that communicates with the annular recess 12 and forms a branch passage. is attached so as to intersect with the main pipe 10.

8 is a cylindrical valve member fitted to the inner circumferential surface of the valve body 7 so as to be slidable in the direction of the main pipe 10; 9 is a cylindrical valve member that is crimped to the valve seat 13 provided on the valve body 7; This is a coil spring as an elastic member that acts to seal the check valve.

The lift of the valve is determined by the gap C between the main body 7 and the end face of the valve member 8.

In this check valve device, when the sum of the pressure of the hydraulic oil flowing in the main pipe 10 and the elastic force of the coil spring 9 becomes smaller than the pressure of the hydraulic oil supplied from the branch pipe 11, the valve member 8 opens. Oil is supplied from the branch pipe 11 to the main pipe 10.

Since the supplied hydraulic pressure is applied to the entire circumference of the valve seat 13, oil is uniformly supplied to the main pipe from the entire circumference of the annular recess 12 at the same time as the valve is opened.

In this way, in this check valve device, the supplied oil does not flow unevenly from the branch pipe to the main pipe as in the conventional case, so there is no turbulence in the check valve section and the check valve does not float. Does not occur.

Furthermore, compared to the conventional umbrella-life type, the valve has a simpler shape, eliminates the need for a stopper 4, has a larger opening area, and can be made more compact overall.

Note that the flow direction of the hydraulic oil flowing inside the main pipe 10 in FIG. 2 may be reversed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional check valve device, and FIG. 2 is a longitudinal sectional view showing an embodiment of the device of the present invention. 10...Flow path (main pipe), 11...Branch channel (branch pipe), 12...Recess, 8...Valve member, 9... ...Elastic member (coil spring).

Claims (1)

[Scope of utility model registration request] In a check valve device that is provided at the confluence of a straight main flow path and a branch path that intersects the main flow path and controls opening and closing of the main flow path and the branch path, an annular recess is provided on the inner peripheral surface of the main flow path. The branch passage is connected and opened to the recess by being engraved on the inner circumferential surface of the main flow passage, and the fluid in the recess is pressed against a valve seat provided between the recess and the main flow passage by an elastic member. A check valve device characterized in that a valve member that communicates the branch passage and the main passage when the pressure exceeds the elasticity of the elastic member is slidably fitted in the flow direction of the main passage. .