JPH0926044A - Check valve and fluid circuit equipped with this check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve which is strong and excellent in a general- purpose quality and can be made inexpensively because of compact and simple structure and is made to be the simplification form of an integral component of a plate type by changing valve structure. SOLUTION: This check valve is equipped with a seat 2 that is made up by providing a bearing 4 at the center of a cylindrical pipe body 3 and arranging plural through-holes 5 on the outside of the bearing 4 and providing projectingly a valve seat 6 outside plural through-holes 5 on one side of the pipe body 3; and a valve 10 that is made up by conducting the integral coupling of a platelike valve body 13 and a coming-off stopping stopper 12 at both ends of a spindle 11 and arranging the valve body 13 on the side of the valve seat 6 and inserting the spindle 11 through the bearing 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve used for preventing backflow in various fluid circuits, and more particularly to a plate type check valve using a plate-shaped valve body.

[0002]

2. Description of the Related Art Conventionally, various devices operated by fluid,
Machines sometimes use check valves as valve elements in fluid circuits. There are various types of check valves, but it is a plate type that uses a plate-shaped plate instead of a ball or a spool for the valve body, and it is configured as an integral part and can be easily mounted in a circuit. A simple form is known.

As a conventional example of this type of check valve, there is a check valve described in the prior art of Japanese Patent Publication No. 7-30849. In the check valve, a holder is provided on a side of a valve seat portion of a tubular seat having a single through hole, and a protrusion of a plurality of legs is engaged with a groove of the seat, thereby the seat is provided in the seat. On the other hand, they are mounted with a relatively large space. A plate-shaped valve element is interposed between the valve seat portion and the stopper in the holder so as to move and open / close in a free state, thereby being configured as an integral part.

Also, the holder has a flow path formed on the outside through a gap between the inside and the legs.
Therefore, as a pipe mounting structure for the check valve, a large-diameter cylindrical portion is formed on the opposite side of the seat from the holder,
It is fixed to the pipe by the groove of the large-diameter cylindrical portion. In this case, since the flow path is also formed outside the holder, the holder is arranged apart from the inner wall of the pipe.

[0005]

By the way, in the conventional check valve as described above, the holder has a plurality of legs and the stopper, and the legs and the stopper are bent to form a structure. Is very complicated. Since the groove for mounting the holder on the sheet, the large-diameter cylindrical portion for mounting on the pipe and the groove are provided in the axial direction, the sheet itself becomes long and the structure is complicated.
Since the holder for accommodating the valve element is mounted on the valve seat portion side of the seat with a relatively large space therebetween, the entire length of the seat and the holder becomes long. Therefore, in such a structure, the cost is increased due to the increase in size and the complexity, and there is a case where the structure is limited when mounted in the fluid circuit.

Further, when the valve is opened, the valve element comes into contact with the stopper of the holder and the fluid pressure acts on the holder side, but the holder is engaged with the groove of the seat by the protruding portion of the foot. However, there is a risk that the holder will come off due to fluid pressure. Since the holder needs to be arranged at a predetermined distance from the inner wall of the pipe, there is a problem that when the diameter of the pipe changes, both the sheet and the holder need to be adjusted. The present invention has been made in view of such problems, and an object thereof is to provide a check valve that is compact, has a simple structure, can be inexpensive, is robust, and has excellent versatility. .

[0007]

In order to achieve the above object,
A check valve according to the present invention is provided with a bearing at the center of a cylindrical tubular body, a plurality of through holes are arranged outside the bearing, and one side of the tubular body is provided outside the plurality of through holes. A seat formed by projecting a valve seat, a plate-shaped valve element and a stopper for stopper are integrally coupled to both ends of the shaft, the valve element is arranged on the valve seat side, and the shaft is inserted into the bearing. It is characterized by having a valve that becomes.

In the check valve according to the present invention configured as described above, when a fluid pressure corresponding to the flow direction acts on the valve body, the valve has the shaft supported by the bearing and the valve of the seat. Stable and reliable movement inside. Then, the valve body comes into contact with and separates from the valve seat of the cylindrical body and is automatically opened / closed to prevent backflow when the valve is closed. Further, since the valve is supported inside the seat by the bearing so as to be movable, the structure is an integral part, so that the valve has a compact and simple structure and is robust. Further, it is possible to adapt to various pipelines only by the size of the tubular body, and the versatility is increased.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing an embodiment of a check valve according to the present invention, and FIG. 2 is an exploded perspective view of the same. The check valve 1 includes a seat 2 including a cylindrical body 3 and
The cylindrical body 3 is provided with a bearing 4 provided in the entire axial center region. The cylindrical body 3 is provided with, for example, four through holes 5 penetrating in the axial direction outside the bearing 4, and the through holes 5 are arranged at equal intervals on the same circle and coaxial with the bearing 4. Is installed in. Further, the cylindrical body 3 is provided with a valve seat 6 projecting outside the four through holes 5 on the surface 3a on one side so as to simultaneously open and close the four through holes 5. Further, the cylindrical body 3 has a ring-shaped groove 7 for fixing to the pipe on the outer peripheral surface 3b.

The valve 10 is provided with a plate-shaped valve body 13 and a retaining stopper 12 at both ends of a shaft 11. The shaft 1
Reference numeral 1 is a thickness that can be inserted into the bearing 4, and is formed longer than the axial length of the cylindrical body 3 including the valve seat 6 by a valve lift amount. The stopper 12 is provided at one end of the shaft 11 with the bearing. It is formed integrally with the end portion of the terminal 4 so that it can be hooked. Here, since the stopper 12 is integrally formed at one end of the shaft 11, the valve body 13 has a separated structure.

That is, a threaded portion 11a that is screwed into the nut 14 is provided at the other end of the shaft 11, and the valve body 13 is formed in a disc shape having a diameter larger than that of the valve seat 6 and has a mounting hole at the center. 15
Is provided. Then, the shaft 11 is replaced by the stopper 12
Is arranged on the side opposite to the valve seat 6 and is movably inserted into the bearing 4. In this state, the mounting hole 15 is inserted into the screw portion 11a, and the nut 14 is tightened to fasten the valve body 13 Are integrally connected to the shaft 11. Further, the valve body 1
3 is arranged orthogonal to the valve seat 6 side so that it can be seated.

In this case, since the wide range of the shaft 11 is supported by the bearing 4 provided in the entire region of the cylindrical body 3 in the axial direction, the entire valve 10 is stably and surely horizontally inside the seat 2. It is possible to ensure movement and reduce rattling. Thus, the check valve 1 is integrally assembled with the valve 10 inside the seat 2, and is configured as an integral part.

When the check valve 1 is mounted in the conduit of the fluid circuit, the inside diameter of the conduit 20 and the outside diameter of the cylindrical body 3 are made substantially the same, and the cylindrical body 3 is accommodated in the conduit 20. Inserted orthogonally. Then, the pipe 2 is inserted into the groove 7 of the cylindrical body 3.
The cylinder 3 is fixed by crimping 0 and engaging the throttle portion 21 with the groove 7, whereby the check valve 1 is mounted inside the conduit 20. When the diameter of the conduit 20 changes when the conduit is attached, it is possible to adapt to various conduits by adjusting only the size of the tubular body 3, and the versatility increases.

Next, the operation of the check valve 1 of the present embodiment configured as described above will be described. When a fluid flows from the left to the right in the conduit 20 as indicated by an arrow A in FIG. 1, a fluid pressure is applied to the valve body 13 through the four through holes 5 of the seat 2 in the check valve 1. When acting on the left side and conversely the fluid flows from right to left as indicated by arrow B, the fluid pressure acts directly on the right side of the valve body 13. At this time, since the wide range of the shaft 11 is supported by the bearing 4, the valve 10 is surely horizontally moved to the left and right by the fluid pressure in any case.

Therefore, in the flow of the fluid indicated by the arrow A, the valve 10 moves to the right due to the fluid pressure acting on the left side of the valve body 13, and the valve body 13 separates from the valve seat 6 and automatically opens. Therefore, the fluid flows downstream through the four through holes 5, the gap between the valve body 13 and the valve seat 6. At this time, the stopper 12 is hooked on the end portion of the bearing 4 and held in the valve open state, which is the forward direction. In the flow of the fluid indicated by the arrow B, the valve 10 is moved leftward by the fluid pressure acting on the right side of the valve body 13,
Seats on the valve seat 6 and closes automatically, thus stopping the flow of fluid. Therefore, in this case, the flow is in the reverse direction and backflow is prevented.

FIG. 3 is a sectional view showing an embodiment adapted to a check valve unit. The check valve unit 25 includes a pipe line 26, and the pipe line 26 is formed with a large diameter in the middle corresponding to the size of the check valve 1 and at both ends corresponding to the piping of the circuit or the like. . The check valve 1 is previously mounted inside the pipe line portion 26a in the same manner by caulking or the like, and the pipe line portion 26b can be connected to the circuit pipe. Further, since the check valve 1 is built in the pipe line 26 and it is not possible to judge the forward direction or the reverse direction depending on the mounted state from the outside, at least the forward direction according to the mounted state is displayed on the front side of the pipe line 26. Has been done. The same parts are designated by the same reference numerals and the description thereof will be omitted.

Therefore, in the check valve unit 25, the check valve 1 can be easily provided in the circuit only by connecting the pipes 27 of the circuit to the pipe line portions 26b at both ends of the pipe line 26. This makes it easier to handle. At this time, the flow direction of the fluid in the circuit (arrow C) and the check valve unit 25
By connecting the display in the forward direction together, it is possible to prevent accidental mounting in the reverse direction.

FIG. 4 is a sectional view showing another embodiment of the valve. The valve 10 has a rod 11 at the end of the shaft 11.
b is extended, the stopper 17 is press-fitted into the rod 11b, and the valve body 13 is fixed. Therefore, in this case, the mounting of the valve body 13 is facilitated and the coupling strength of the valve body 13 is also increased. FIG. 5 is a sectional view showing still another embodiment of the valve. In the valve 10, the valve body 13 is integrally formed at the end of the shaft 11. Therefore, in this case, the coupling strength of the valve body 13 is maximized, and the slack of the shaft 11 and the valve body 13 when seated is prevented.

[0019]

As can be understood from the above description, the check valve of the present invention is a compact and simple structure because the check valve of the present invention is constructed as an integral part which is movably supported by the bearing inside the seat. It has a unique structure and is robust. For this reason, it can be manufactured at low cost, and since it is space-saving, it can be installed in a place with a narrow pipeline. In addition, it is possible to adapt to various conduits only by the size of the cylinder, and the versatility is increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a check valve according to the present invention.

FIG. 2 is an exploded perspective view of the check valve shown in FIG.

FIG. 3 is a sectional view showing an embodiment of a check valve unit.

FIG. 4 is a sectional view showing another embodiment of the valve.

FIG. 5 is a side view showing still another embodiment of the valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Check valve 2 ... Seat 3 ... Cylindrical body 4 ... Bearing 5 ... Through hole 6 ... Valve seat 10 ... Valve 11 ... Shaft 12 ... Withdrawal stopper 13 ... Valve body

Claims (2)

[Claims] 1. A bearing is provided at the center of a cylindrical tubular body, a plurality of through holes are arranged outside the bearing, and a valve seat is projected outside the plurality of through holes on one side of the tubular body. Seats that are installed,
A plate-shaped valve body and a stopper are integrally connected to both ends of the shaft,
A check valve, wherein the valve element is disposed on the valve seat side and the shaft is inserted into the bearing. 2. A fluid circuit comprising a conduit forming a fluid circuit and a check valve installed in the conduit, wherein the check valve is provided with a bearing at the center of a cylindrical body. A seat having a plurality of through holes arranged outside the bearing, and a valve seat projecting from the plurality of through holes on one side of the tubular body, and plate-like valve bodies at both ends of the shaft. A stopper is integrally connected, the valve body is arranged on the valve seat side, the shaft is inserted into the bearing, and the groove is provided in the cylindrical body. A fluid circuit characterized in that the passage is caulked.