JPH10220605A - Ball-type check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball-type check valve which stably closes a valve seat hole and ensures the closing state for a long time. SOLUTION: A passage 1 is divided by a valve seat hole 2 into a first passage 3 and a second passage 4. A cross-sectional shape orthogonal to the direction of the length of the first passage 3 are formed by a ball valve support hole 6 having a diameter slightly larger than the diameter N of a ball valve 14 and a passage 7 partially protruded from the ball valve support hole 6. A ball valve 14 closing and opening the valve seat hole 2 is disposed in the ball valve support hole 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve which is disposed facing a valve seat hole formed in a flow passage and allows a fluid to flow to one side by opening the valve seat hole. The present invention relates to a ball type check valve that blocks a flow of fluid to the other side by closing a valve seat hole, and is used in various fluid control devices.

[0002]

2. Description of the Related Art FIG.
This will be described with reference to FIGS. The flow path 10 is divided into a primary flow path 12 and a secondary flow path 13 by a valve seat hole 11 having a diameter L. In FIG. 7, the upper side of the primary side flow path 12 is connected to the valve seat hole 11, and the diameter M of the primary side flow path 12
Is set sufficiently larger than the diameter of a ball valve described later.
Making the diameter M of the primary flow path 12 sufficiently larger than the diameter of the ball valve means that the ball valve is disposed in the primary flow path 12 and goes from the primary flow path 12 to the valve seat hole 11. This is because the amount of fluid is limited by the diameter M of the primary flow path and the diameter of the ball valve. That is, if the diameter M of the primary flow path 12 and the diameter of the ball valve are close to each other, the effective passage area of the primary flow path 12 is narrowed, and the necessary fluid cannot be supplied. 1
Reference numeral 4 denotes a ball valve which is movably disposed in the primary side flow path 12 and opens and closes the valve seat hole 11. The diameter N of the ball valve 14 is larger than the diameter L of the valve seat hole 11, The diameter of the primary flow path 12 is sufficiently smaller than the diameter M. Reference numeral 15 denotes a spring in the primary flow path 12, one end 15 </ b> A of which is locked by the ball valve 14 and the other end 15 </ b> B of which is locked by the locking member 16. The diameter P of the spring 15 is naturally smaller than the diameter N of the ball valve 14. The locking member 1
Reference numeral 6 denotes a primary side flow passage 12 which is separated from the valve seat hole 11 and is fitted and arranged facing the valve seat hole 11. The fluid can pass through the outer periphery of the locking member 16. Through hole 17
Is formed.

[0003] The above-mentioned ball type check valve is used as a fluid control device, for example, a suction side check valve S of an acceleration pump device of a carburetor.
a, Used as a discharge-side check valve Sb. The secondary flow path 13 as the suction-side check valve Sa is connected to the float chamber 18, and the primary flow path 12 is connected to the pump chamber 19. or,
The secondary side flow path 13 as the discharge side check valve Sb is the pump chamber 1
9, the primary flow path 12 is connected to the acceleration nozzle 20. This is shown in FIG.

Therefore, when the chamber volume of the pump chamber 19 increases and the pressure in the pump chamber 19 decreases, the discharge-side check valve Sb
The ball valve 14 as a valve closes the valve seat hole 11, while the ball valve 14 as a suction-side check valve Sa opens the valve seat hole 11, and sucks the fuel in the float chamber 18 into the pump chamber 19. To store. On the other hand, during acceleration of the engine, the pump chamber 19
When the pressure in the pump chamber 19 increases due to a decrease in the chamber volume of the pump chamber 19, the ball valve 14 serving as the suction-side check valve Sa is inserted into the valve seat hole 1.
1 is closed, while the ball valve 14 as the discharge side check valve Sb opens the valve seat hole 11 and injects the fuel in the pump chamber 19 into the intake passage 21 of the carburetor through the acceleration nozzle 20. .

[0005]

In such a conventional ball check valve, when the longitudinal direction of the flow path is inclined horizontally, the ball valve 14 and the spring 15 move largely to the lower position in the direction of gravity. This state is shown in FIG. According to the above description, the ball valve 14 is locked in a part of the valve seat hole 11 and cannot close the valve seat hole 11 accurately, so that a stable closing property of the valve seat hole 11 cannot be obtained.
Further, the ball type check valve may be vibrated when mounted on the device. According to this, the diameter M of the primary flow path 12 is sufficiently larger than the diameter N of the ball valve 14 and the diameter of the spring 15. Because of the large diameter, the ball valve 14 swings greatly in the primary flow path 12. According to the above description, the ball valve 14 and the valve seat hole 11 are repeatedly contacted in an unstable state, and the contact portion between the ball valve 14 and the valve seat hole 11 may be greatly worn or unevenly worn. Therefore, a stable valve closing function cannot be guaranteed for a long period of time.

The ball type check valve according to the present invention obtains a stable closing property without being influenced by the mounting position. And guaranteeing the obstruction over a long period of time. With the goal.

[0007]

In order to achieve the above object, a ball type check valve according to the present invention has a primary side flow path and a two-way flow passage through a valve seat hole.
A cross section orthogonal to the longitudinal direction of the primary flow path in a ball type check valve in which a ball valve that opens and closes a valve seat hole is movably arranged in the primary flow path and is divided into a secondary flow path. The first feature is that the shape is formed by a ball valve support hole having a diameter slightly larger than the diameter of the ball valve, and a fluid flow path partially outward from the ball valve support hole.

Further, the present invention is characterized in that, in addition to the first feature, a plurality of the fluid flow paths are provided symmetrically with respect to the center of the ball valve support hole.

The present invention has a third feature in that, in addition to the first feature, the ball valve is pressed toward a valve seat hole by a spring.

Further, the present invention provides, in addition to the third feature,
A fourth feature is that one end of the spring is locked by a ball valve, and the other end of the spring is locked by a locking member fitted and arranged in the ball valve support hole.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the ball type check valve according to the present invention will be described below with reference to FIGS. FIG. 1 is a vertical sectional view of a ball check valve. FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is a vertical sectional view taken along line BB of FIG. FIG. 4 is a longitudinal sectional view taken along line CC of FIG. The flow path 1 is divided into a primary flow path 3 and a secondary flow path 4 by a valve seat hole 2 having a diameter L. The upper side of the primary side flow path 3 in FIG. 1 is connected to the valve seat hole 2, and the lower side thereof is connected to the fitting hole 5. A ball valve 1 having a diameter N is provided in the primary side flow path 3.
4 is movably arranged facing the valve seat hole 2.

The cross section of the primary flow path 3 perpendicular to the longitudinal direction is formed by a ball valve support hole 6 and a fluid flow path 7 which are well shown in FIG. The diameter D of the ball valve support hole 6 is larger than the diameter L of the valve seat hole 2 and slightly larger than the diameter N of the ball valve 14. Specifically, the gap between the outer diameter of the ball valve 14 and the ball valve support hole 6 is preferably a minute gap of about 1 mm. This gap is appropriately determined in consideration of various conditions. The fluid flow path 7
In this embodiment, four fluid flow paths 7 are recessed symmetrically with respect to the center of the ball valve support hole 6. Was. The outer diameter E of the fluid flow path 7 is larger than the diameter D of the ball valve support hole 6. The primary side flow path 3 formed by the ball valve support hole 6 and the fluid flow path 7 has a desired length F formed below the valve seat hole 2 in the longitudinal direction. The length F is set to be at least longer than the operation stroke of the ball valve 14. Therefore, in this example, four ball valve support holes 6 divided by the fluid flow path 7 are formed over the length F, and four more fluid flow path 7
Is formed outside the ball valve support hole 6 over a length F. The spring 15 is disposed in the ball valve support hole 6, one end 15 A of which is locked by the ball valve 14, and the other end 15 B is formed by a locking member 16 fitted in the fitting hole 5. Is locked. The locking member 16 and the fitting hole 5
Are formed with four through holes 17. This locking member 16 is better shown in FIG.

Next, the operation will be described. In a state where the flow path 1 is arranged in the vertical direction, the ball valve 14 is arranged concentrically in the ball valve support hole 6 and the spring 1
5 is also arranged concentrically in the ball valve support hole 6 so that the ball valve 14 can close the valve seat hole 2 exactly. On the other hand, an opening force for opening the valve seat hole 2 is urged against the ball valve 14,
(Specifically, this means that a positive pressure acts on the ball valve 14 from the secondary flow path 4 via the valve seat hole 2 or a negative pressure acts on the ball valve 14 from the primary flow path 3. When the ball valve 14 opens the valve seat hole 2, the fluid supplied into the primary side flow path 3 passes through the through hole 17 of the locking member 16, the fluid flow path 7, and the valve seat hole 2. It flows down into the secondary flow path 4. At this time, the ball valve 14 opens the valve seat hole 2 concentrically along the ball valve support hole 6, so that the valve seat hole 2 is opened with an accurate annular gap. Then, in such a state, lateral vibration is applied to the ball valve 14 and the ball valve 14
When the ball valve 14 moves to the side, the ball valve 14 is supported by the ball valve support hole 6 having a small gap, and the side movement thereof is suppressed to an extremely small range.
4 is well maintained with respect to the valve seat hole 2. or,
The fact that the lateral movement of the ball valve 14 has been suppressed is the ball valve 1
4. Uneven wear of the valve seat hole 2 is eliminated, and a stable valve opening / closing function can be guaranteed for a long period of time.

When the flow path 1 is inclined and arranged in a horizontal state, the ball valve 14 is supported by the ball valve support hole 6 with a small gap as described above.
As shown in FIG.
The large movement of in the downward direction in the direction of gravity is suppressed. According to the above description, the ball valve 14 receives the pressing force of the spring 15 and abuts against the valve seat hole 2 centrifugally, so that the valve closing property is well maintained. Further, in such a horizontal arrangement state, the vertical movement of the ball valve 14 is suppressed even when subjected to vibration, so that the ball valve 14 and the valve seat hole 2 do not wear unevenly.

Further, according to the provision of a plurality of fluid passages 7 (four in this embodiment) symmetrically with respect to the center of the ball valve support hole 6, the fluid is uniformly distributed through the fluid passages 7 through the ball valve. 14 acts on the outer peripheral surface of the ball valve 14 so that the fluid does not bias the ball valve 14 to one side.
4 can be accurately pressed toward the valve seat hole 2, and the closing property of the valve can be improved.

The formation of the ball valve support hole 6 and the fluid passage 7 can be made extremely easily by casting during injection molding or by press-fitting a drawn material into the primary passage 3. it can.

Another embodiment of the ball type check valve will be described with reference to FIGS. 5 and 6. FIG. 5 is a longitudinal sectional view, and FIG. 6 is a transverse sectional view taken along line GG of FIG. In the present embodiment, the primary flow path 3 composed of the ball valve support hole 6 and the fluid flow path 7 in the first embodiment extends further downward, and the locking member 16 It was fitted at the lower end. The locking member 16 is formed in a circular shape so as to be fitted into the ball valve support hole 6, and is
The other end 15 </ b> B is locked by the locking member 16. Therefore, the fluid flows through the plurality of fluid flow paths 7 and the ball valve support holes 6.
To the valve seat hole 2.

According to the above description, the primary side flow path 3 may be a single-shaped flow path composed of the ball valve support hole 6 and the fluid flow path 7, and the locking member 16 may be simply disc-shaped. Therefore, the structure of the ball-type check valve can be simplified, and the manufacturing cost can be reduced.

[0019]

As described above, according to the ball type check valve of the present invention, the ball valve having a cross section perpendicular to the longitudinal direction of the primary flow path having a diameter slightly larger than the diameter of the ball valve. The ball valve formed by the support hole and the fluid flow path partially outwardly extending from the ball valve support hole and opening and closing the valve seat hole is disposed in the ball valve support hole.
Regardless of the arrangement of the secondary flow path, a stable opening and closing function of the ball valve can be maintained at all times, and the degree of freedom of mounting the ball type check valve on the device can be greatly improved. Further, when the ball valve receives vibration, the vibration of the ball valve is suppressed by the ball valve support hole having a minute gap and does not vibrate greatly, so that the wear of the ball valve and the valve seat hole is suppressed, and over a long period of time. A stable opening and closing function can be obtained.

In addition, since a plurality of fluid flow paths are provided symmetrically with respect to the center of the ball valve support hole, the fluid pressure acting on the ball valve from the fluid flow path can be made uniform. A stable opening and closing function of the ball valve can be maintained without being biased to one side.

Further, according to the fact that the ball valve is pressed toward the valve seat hole by the spring, the ball valve is pressed by the spring in a substantially centered state. The valve seat hole may be closed.

One end of the spring is locked to the ball valve,
According to the locking of the other end of the spring with the locking member fitted and arranged in the ball valve support hole, it is not necessary to provide a special through hole in the locking member, and the fluid flow path can be used as the through hole. Thus, the manufacturing cost of the primary flow path and the manufacturing cost of the locking member can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a ball check valve according to the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a longitudinal sectional view taken along line BB of FIG. 2;

FIG. 4 is a longitudinal sectional view taken along line CC of FIG. 3;

FIG. 5 is a longitudinal sectional view showing a second embodiment of the ball check valve according to the present invention.

FIG. 6 is a transverse sectional view taken along line GG of FIG. 5;

FIG. 7 is a longitudinal sectional view showing a conventional ball check valve.

FIG. 8 is a transverse sectional view taken along line HH of FIG. 7;

FIG. 9 is a transverse sectional view taken along line JJ of FIG. 7;

FIG. 10 is a longitudinal sectional view showing a state where a conventional ball check valve is mounted on a carburetor.

11 shows a state in which the primary side flow path of the ball type check valve of FIG. 7 is arranged in a horizontal direction.

[Explanation of symbols]

 2 Valve seat 3 Primary flow path 6 Ball valve support hole 7 Fluid flow path 14 Ball valve 15 Spring 16 Locking member

Claims (4)

[Claims] 1. A ball-type reverse in which a ball valve for opening and closing a valve seat hole is movably arranged in a primary side flow path, divided into a primary side flow path and a secondary side flow path by a valve seat hole. In the stop valve, the cross-sectional shape orthogonal to the longitudinal direction of the primary flow path 3 is changed to a ball valve 14.
A ball valve formed by a ball valve support hole 6 having a diameter D slightly larger than the diameter N of the ball valve, and a fluid flow path 7 partially directed outward from the ball valve support hole 6, and facing the valve seat hole 2. A ball check valve 14 is disposed in the ball valve support hole 6. 2. The fluid passage 7 is provided with a ball valve support hole 6
2. The ball check valve according to claim 1, wherein a plurality of the check valves are provided symmetrically with respect to the center of the ball. 3. The ball type check valve according to claim 1, wherein the ball valve is pressed toward the valve seat hole by a spring. 4. One end 15A of the spring 15 is locked by a ball valve 14, and the other end 15B of the spring 15 is locked by a locking member 16 fitted and disposed in the ball valve support hole 6. 3. The ball check valve according to 3.