JP2001074153A - Quickly closing check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quickly closing check valve for easily assembling or disassembling a spring presser member, and having simple structure and excellent productivity. SOLUTION: This quickly closing check valve 10 is equipped with: a valve easing 12 equipped with inflow and outflow ports 14 and 18 and a valve seat 16 provided on the inner side of the port 14, a valve element 20 seated on the seat 16, a coil spring 26 for energizing the element 20 to the seat 16, and a spring presser member 24 abutting on and compressing another end of the spring 26, and also arranged in the port 18 side of the casing 12. In this case, at least two projectional fitting parts are provided on the side wall of the member 24, and also are equipped with a groovelike cavity wherein at least two projecrional fitting parts pass into the inside from outside of the casing 12, and a groove wherein at least two projectional fitting parts are fitted from the inside toward outside halfway of the easing 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil spring lift type quick-close check valve having a simple structure and excellent mass productivity, in which a spring holding member can be easily assembled and removed.

[0002]

A check valve is a valve used to automatically prevent backflow. In the flowing direction, a valve element is naturally pushed open by the force of flow.
When the flow is to be performed in the opposite direction, the valve body is in close contact with the valve seat to block the flow. Above all, the coil spring lift type quick-close check valve, which is devised so that the valve element is pushed backward by a coil spring to ensure that the valve element adheres to the valve seat when the flow weakens, has been widely used in the past. It is a useful and useful check valve.

A conventional coil spring lift type quick-close check valve has a structure as shown in FIGS. 12, 13 and 14, for example. That is, the check valve 60 is
2. Valve seat 7 provided at the inner edge of valve box 62 on the side of inflow port 64
4. A valve body 70 disposed on the outlet 66 side facing the valve seat 74, a valve stem 84 located near the central axis of the valve box 62 and connected to the valve body 70, and one end of the valve stem 84. A spring holding member 80 fixed slidably and fixed near the outlet 66 of the valve box 62, a coil spring 76 having both ends sandwiched by the valve body 70 and the spring holding member 80 through the valve rod 84, a bypass It is mainly constituted by a valve 68 and the like. FIG. 15 shows a state in which the flow force indicated by the arrow overcomes the pressing force of the coil spring 76, the valve body 70 is pushed back, and the check valve 60 is opened.

[0004] The spring holding member 80 is fixed to the valve body 62 by screwing its periphery to the outlet 66. To prevent the spring holding member 80 from being loosened or disengaged, a set screw 82 is further added to the screwed portion. Is screwed. In general, the valve box 62 and the spring pressing member 80 are manufactured by a casting method which is advantageous in cost. However, according to the above-described fixing method, precise processing of the threaded portion is required. Also,
Since the set screw 82 is used, a troublesome operation of preparing tools and jigs is required at the time of assembly and maintenance disassembly.

[0005] On the other hand, there have been some proposals for a method of fixing by simply avoiding screwing. For example, Japanese Utility Model Publication No. 6-15192 proposes an inner spring type fixing method. That is, as shown in FIG. 16, the spring holding member 80 provided with the skirt-like portion 92 in the shape of a quarter cup made of a leaf spring material as shown in FIG.
It is inserted into the valve box 62 having the annular groove 94 from the outlet 66 side. As a result, as shown in FIG. 18, the ring-shaped projection 90 provided on the side of the spring
The check valve 60 is fitted into the annular groove 94 provided near the outlet 66 of the valve box 62 and is stably fixed without coming off due to the elastic repulsive force of the leaf spring material. According to the present fixing method, since screw processing or the like necessary for screwing is not required and a set screw for preventing loosening does not need to be used, reduction in processing cost and improvement in assembling workability are expected. However, the manufacturing cost of the spring pressing member 80 made of a leaf spring material is considerably high, and for disassembly work such as maintenance, a special method for removing the ring-shaped projection 90 from the annular groove 94 and taking out the skirt-shaped portion 92 is required. There are still problems such as the necessity of a special jig.

Accordingly, the present inventor has conducted intensive studies on a quick closing check valve which can easily assemble and remove the spring holding member, has a simple structure and is excellent in mass productivity, and as a result, has reached the present invention. It was.

[0007]

SUMMARY OF THE INVENTION The gist of the quick-close check valve according to the present invention is to provide a valve box having an inlet, an outlet, and a valve seat provided inside the inlet. A valve body seated on a valve seat, a coil spring for urging the valve body against the valve seat, and a coil spring retainer disposed on the outflow side of the valve box while being in contact with the other end of the coil spring to be compressed. And at least two convex fitting portions are provided on the side wall of the spring holding member, and at least two convex fitting portions are formed on the inner wall forming the outlet of the valve box. It is provided with a groove-shaped depression that passes from the outside to the inside, and a groove in which at least two convex fitting portions are fitted halfway from the inside of the valve box to the outside.

Further, in such a quick-close check valve, the convex fitting portions are provided at positions substantially symmetric to each other around the center axis of the spring pressing member.

Further, in such a quick-close check valve, three or four convex fitting portions are provided on a side portion of the spring holding member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the quick-close check valve according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of a particularly useful embodiment of the present invention. That is, the check valve 10 includes a valve box 12, a valve seat 16 provided on an inner edge of the valve box 12 on the inflow port 14 side, a valve body 20 disposed on the outflow port 18 side opposite to the valve seat 16,
A valve stem 22 located near the central axis of the valve box 12 and connected to the valve body 20, and one end of the valve stem 22 is slidably housed therein, and a spring holding member 24 fixed near the outlet 18 of the valve box 12. , And is mainly constituted by a coil spring 26, a bypass valve 28, and the like, both ends of which are sandwiched between the valve body 20 and the spring pressing member 24 through the valve rod 22. Further, a rubber sheet 30 for improving water tightness is attached to a contact surface of the valve body 20 with the valve seat 16.
The slide guide 34 for smoothing the movement of 0
It is attached to the inflow port 14 side of the valve element 20 via a detent nut 32.

FIG. 2A shows the check valve 10 shown in FIG.
FIG. 3 is an overall top view of FIG. 1, showing that the outflow port 18 has a substantially square shape with rounded corners. A groove 38 is provided on the back side of the substantially square linear portion 42, and FIG.
As shown in (2), a convex fitting portion 36 provided on the outer peripheral portion of the spring holding member 24 is inserted from the inside of the valve box 12 and fitted. The rounded corner of the substantially square outlet 18 forms a groove-shaped recess 40. The width of the groove-shaped recess 40 is wider than the width of the convex fitting portion 36, and the depth measured from the central axis 48 of the spring holding member 24 is
8 is substantially the same as the depth of the projection 8 and has a shape through which the convex fitting portion 36 can pass.

FIG. 3 shows the check valve 10 opened.
The pressure of the fluid flowing from the inlet 14 in the direction of the arrow overcomes the repulsive force of the coil spring 26, and the valve body 20 is pushed back to the outlet 18 side. As a result, the valve body 20 retreats to a position where the pressure of the fluid and the repulsive force of the coil spring 26 are balanced, so that the space between the valve body 20 and the valve seat 16 is opened, and the fluid flows between the inlet port 14 and the outlet port. 18 and flow continuously. When the pressure of the fluid weakens and the repulsive force of the coil spring 26 becomes superior, the valve body 20 moves to the valve seat side again, and the valve body 20 and the valve seat 16 come into close contact with each other to stop the flow. Will be. Valve 2
If 0 receives back pressure from the outflow port 18 side, it will be more and more in close contact with the valve seat 16 so that backflow is prevented.

FIG. 4 shows a side cross section of the valve box 12.
Considering this in conjunction with FIG.
It is clear that the vicinity is open in a substantially square pillar shape with rounded corners. Each of the rounded corners forms a groove-like recess 40, and both ends of the groove-like recess 40 are open to the outflow port 18 and the cavity 44 provided at the center of the valve box 12. Have been. The rectangular parallelepiped groove 38 cut in each of the linear portions 42 has a dead end closed on the outlet 18 side, and has a hollow portion 44 on the outlet 18 side.
Open to the public. Therefore, the insertion of the convex fitting portion 36 of the spring holding member 24 into the groove 38 must be performed from the hollow portion 44. Groove 40 and groove 38
Are provided at four locations. Then, the four groove-shaped depressions 40 or the four grooves 38 are
They are four times rotationally symmetrical to each other.

FIG. 5 shows the spring holding member 24. The spring holding member 24 is a four-fold rotationally symmetric shape in which a blade-like arm portion 46 is extended in all directions,
A convex fitting portion 36 is provided at each end of the arm portion 46. Each convex fitting portion 36 has a rectangular parallelepiped shape, and its outer surface is parallel to the central axis 48 of the spring holding member 24. Therefore, when the convex fitting portion 36 is inserted into the groove 38 formed in a rectangular parallelepiped shape, it extends along the central axis 48. Can slide and move smoothly. Further, a valve stem slide hole 52 for slidably receiving the valve stem 22 with the same central axis as the spring holding member 24 is provided, and the cylindrical projection 50 is extended so that the valve stem slide hole 52 extends toward the inflow port 14. Is provided. Cylindrical convex part 5
0 fits into one end of the coil spring 26,
The spring holding member 24 and the coil spring 26 come into contact with each other with their central axes aligned.

Next, a procedure for disassembling the check valve 10 of the present invention will be described. As shown in FIG. 6, first, the spring holding member 24 is pushed down from the outlet 18 side. The spring member 26 is pushed into the hollow portion 44 by a force not to lose the repulsive force of the coil spring 26 until the spring holding member 24 is completely removed. Normally, it can be pushed directly with fingers. However, when a coil spring having a large repulsive force is used, an annular disassembly jig with a contact portion with the valve stem 22 may be used.

Next, the spring holding member 24 is moved to about 45
Rotate °. In the state shown in FIG. 6, since the spring holding member 24 only accommodates the valve stem 22 in the valve stem sliding hole 52, the spring holding member 24 can freely rotate around the valve stem 22. FIG. 7 and FIG. 8 show a state after being rotated by about 45 °. The arm portion 46 of the spring holding member 24 has the groove 3
8, the direction is changed toward the groove-shaped depression 40, and the convex fitting portion 36 at the tip thereof has moved below the groove-shaped depression 40. This operation is performed while pressing the coil spring 26.

The spring holding member 24 in which the convex fitting portion 36 has moved below the groove-shaped recess 40 releases the force for pressing the spring holding member 24, and receives the repulsive force of the coil spring 26 to quickly make the valve case. Extruded from 12. The width of the groove-shaped recess 40 is wider than the width of the convex fitting portion 36, and the depth thereof is substantially the same as the depth of the groove 38, is larger than the diameter of the spring holding member 24, and both ends are opened. Therefore, the convex fitting portion 36 can smoothly pass through the groove-shaped recess 40. FIG.
Although the state where the spring holding member 24 is removed is shown, the coil spring 26, the valve stem 22, the valve body 20, etc., which were covered by the spring holding member 24, are restrained when the spring holding member 24 is removed. Since it is completely lost, it can be picked up one after another from the outlet 18 and taken out. That is, first, the coil spring 26 is taken out, and then the valve stem 22 and the valve body 20 are removed.
The connection with is taken out.

The assembly of the spring holding member 24 can be performed by reversing the disassembly procedure described above. That is, first, the connection between the valve rod 22 and the valve element 20 is supplied to the valve box 12 through the outlet 18.
The valve seat 16 and the valve element 20 are housed in close contact with the slide guide 34 as a guide, and then the coil spring 26 is housed through the valve rod 22. Next, the spring holding member 24 is pushed into the cavity 44 while the convex fitting portion 36 is being fitted along the groove-shaped recess 40, and the cylindrical protrusion 50 provided at the bottom of the spring holding member 24 is inserted into the coil spring 26. Then, the center axes of the coil spring 26 and the spring holding member 24 are aligned. Then, by rotating the spring holding member 24 by about 45 ° to align the convex fitting portion 36 with the position of the groove 38 and gradually releasing the holding force, the spring holding member 24 becomes the coil spring 26.
, The convex fitting portion 36 is pushed into the groove 38. The pushed-in convex fitting portion 36 comes into contact with the closed end of the groove 38 on the outlet 18 side, and stops and fits. The spring holding member 24 includes the coil spring 2
6 loses freedom in the central axis direction by being pressed against the closed end of the groove 38 and loses freedom of rotation by fitting the convex fitting portion 36 into the groove 38, so that the valve box 12 is stably mounted. Will be fixed.

As is apparent from the above description, the present invention provides:
It is based on the fact that the coil spring for pressing the valve body against the valve seat is used not only for the purpose but also for surely holding the spring holding member at a fixed position. As a result, the shape and structure of the valve box and spring retainer are extremely simple, and the precision required for conventional check valves, such as threading, groove processing for C-type retaining rings, and bending of pressed parts, is required. No special processing is required. In addition, the mass productivity and manufacturing cost of check valve production have been greatly improved, including the reduction in the number of parts due to the elimination of the use of set screws.

Further, according to the check valve of the present invention, when the spring holding member is incorporated into the valve box or when disassembled for maintenance or the like, disassembly and assembly can be easily performed without the need for a jig or tool. Therefore, there is an effect that the working process time for assembling and disassembling is significantly reduced.

The spring holding member 2 illustrated in FIG.
In FIG. 4, four arm portions 46 are provided symmetrically, and a convex fitting portion 36 is provided at the tip of each arm portion 46. However, the shape of the spring holding member 24 is limited to this example. Not something. For example, the spring holding member 24 shown in FIG. 10A has two convex fitting portions 36, and the spring holding member 24 shown in FIG. 10B has three convex fitting portions. 36. In the spring holding member 24 shown in FIG. 9C, six convex fitting portions 36 are provided at the tips of six arm portions 46 extending radially. Further, in the spring holding member 24 shown in FIG. 3D, a ring 54 for reinforcing the arm portion 46 is provided on the outer peripheral portion, and the ring 54 is provided with three convex fitting portions 36. I have.

In each of the spring holding members 24 illustrated in FIG. 10, the convex fitting portions 36 are provided at positions symmetrical to each other around the center axis 48 of the spring holding member 24. In order to uniformly receive various pressures received by the spring holding member 24, for example, a repulsive force and a fluid pressure of the coil spring 26, the convex fitting portion 36 is provided at a position symmetric about the central axis 48 of the spring holding member 24.
It is particularly preferable that the spring pressing member 24 is smoothly slid along the groove 38 because a force is evenly applied to each convex fitting portion 36 at the time of assembly or disassembly. .

It is particularly preferable that three or four convex fitting portions 36 are provided. If the number of the convex fitting portions 36 is too large, the space in which the groove-shaped recess 40 is provided is reduced and the groove-shaped recess 40 is formed to have a narrow width, and the workability in assembling and disassembling is reduced. Further, if the number of the arm portions 46 is increased, the fluid resistance is increased, the weight becomes heavy, the operation of the valve body is slowed, and the manufacturing cost is increased. On the other hand, if the number of the convex fitting portions 36 is two or less, the various pressures described above are biased to the spring holding member 24, so that the durability of the check valve is reduced, and Workability at the time decreases. The present inventors have conducted a number of tests and found that three or four convex fitting portions 36 were formed in consideration of the balance among durability, fluid resistance, valve body operability, manufacturing cost, and the like. It has been found that it is particularly preferable to provide them.

The spring holding member 2 illustrated in FIG.
4 is a rectangular parallelepiped as shown in FIG.
8 and parallel. However, the shape of the convex fitting portion 36 is not limited to this example, and can be implemented in various shapes.
For example, the convex fitting portion 36 shown in FIG.
It is composed of a rectangular parallelepiped. The convex fitting portion 36 shown in FIG. 3C has a tapered shape and a trapezoidal upper surface, and the convex fitting portion 36 shown in FIG. The height direction is inclined in a tapered shape, and the side surface is trapezoidal.

A convex fitting portion 36 shown in FIG.
When the groove width is combined with the groove 38 tapered to the outlet 18 side, the narrow tip of the convex fitting portion 36 is inserted into the wide open groove 38, so that the assembling work or the like can be easily performed. Become. Further, the spring holding member 24 pushed backward by the coil spring 26 is fixedly fixed at a predetermined position in the valve box 12 because the tapered convex fitting portion 36 and the groove 38 are fitted to each other and stopped. Is done. The same effect can be obtained by combining the convex fitting portion 36 shown in FIG. 3D with the groove 38 having a groove depth tapered toward the outlet 18.

The material and shape of the coil spring 26 are not particularly limited, and may be those normally used for a coil spring lift type quick closing check valve. The two coil springs 26 may be used in duplicate in preparation for the coil spring 26 being damaged and the spring holding member 24 coming off the groove 38.

Although the present invention has been described in detail above, the present invention does not depart from the spirit and scope of the present invention without departing from the spirit and scope of the present invention, the structure of the check valve, the material and shape of the spring holding member and the coil spring, the convex fitting portion, the groove and the groove. The present invention can be carried out in various modified, modified, and modified forms with respect to the shape of the concave shape.

[0029]

According to the quick-close check valve of the present invention, the shape and structure of the valve box and the spring holding member are extremely simple, and the threading,
Precise processing such as groove processing for C-shaped retaining rings and bending of pressed parts is not required. In addition, the mass productivity and production cost of check valve production are greatly improved, including the fact that the number of parts is reduced by eliminating the use of set screws.

Also, when the spring holding member is incorporated into the valve box or when disassembled for maintenance, the disassembly and assembly can be easily performed without the need for jigs and tools. Time is significantly reduced. Furthermore, since the work is simplified, maintenance can be performed at the site of use, which has the effect of extending the product life and reducing the environmental load.

Further, if the convex fitting portions are provided at positions substantially symmetrical with each other around the center axis of the spring holding member, various pressures received by the spring holding member, such as the repulsive force of the coil spring and the fluid pressure, etc. Can be equally received, so that the members can be reduced in size and weight, and the durability can be improved. Further, at the time of assembling or disassembling, the spring holding member can be smoothly slid along the groove, so that workability is particularly improved.

Furthermore, if the number of the convex fitting portions provided on the spring holding member is three or four, various pressures can be equally received, so that the durability is improved and the spring holding member is assembled. And disassembly workability is improved. Further, since the number of the arm portions is small, the fluid resistance is reduced, the weight is reduced, and the operability of the valve body is improved. Also, the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an example of a check valve according to the present invention.

2 is a top view of the check valve shown in FIG. 1 according to the present invention, wherein FIG. 2 (a) is an overall view, and FIG. 2 (b) is a fitting state of a convex fitting portion and a groove. FIG.

FIG. 3 is a side sectional view showing an operation state of the check valve shown in FIG. 1 according to the present invention.

FIG. 4 is a side sectional view showing a valve box of the check valve shown in FIG. 1 according to the present invention.

5A and 5B are views for explaining a spring holding member of the check valve shown in FIG. 1 according to the present invention, wherein FIG. 5A is a top view and FIG. 5B is a side view.

FIG. 6 is a side sectional view for explaining a disassembling procedure of the check valve shown in FIG. 1 according to the present invention.

FIG. 7 is a top view of the check valve shown in FIG. 6 according to the present invention.

FIG. 8 is a side sectional view illustrating a disassembly procedure of the check valve shown in FIG. 1 according to the present invention.

9 is a side sectional view for explaining a disassembling procedure of the check valve shown in FIG. 1 according to the present invention.

FIG. 10 is a top view showing an example of the shape of a spring holding member according to the present invention, wherein FIG. 10 (a) includes two convex fitting portions, and FIG. FIG. 2C shows an example in which six convex fitting portions are provided. FIG. 2D shows another example including three convex fitting portions.

FIG. 11 is a perspective view showing an example of the shape of a convex fitting portion according to the present invention, wherein FIG. 11 (a) is a rectangular parallelepiped, FIG. 11 (b) is a rectangular parallelepiped divided into two, and FIG. ) Shows an example of a trapezoid having a narrowed width direction, and FIG. 2D shows an example of a trapezoid having a narrowed height direction.

FIG. 12 is a side sectional view showing an example of a check valve according to a conventional example.

FIG. 13 is a top view of the check valve shown in FIG. 12 according to a conventional example.

14 is a bottom view of the check valve shown in FIG. 12 according to a conventional example.

FIG. 15 is a side sectional view showing an operation state of a check valve shown in FIG. 12 according to a conventional example.

16A and 16B show an example of a spring holding member according to a conventional example, in which FIG. 16A is a side view and FIG. 16B is a top view.

FIG. 17 is a side sectional view showing an example of a valve box according to a conventional example.

FIG. 18 is a side sectional view showing another example of the check valve according to the conventional example.

[Explanation of symbols]

 10, 60: check valve 12, 62: valve box 14, 64: inlet 16, 74: valve seat 18, 66: outlet 20, 70: valve 22, 84: valve stem 24, 80: spring pressing member 26, 76: Coil spring 28, 68: Bias valve 30, 72: Rubber sheet 32, 86: Detent nut 34, 88: Slide guide 36: Convex fitting part 38: Groove 40: Groove 42: Linear part 44: hollow portion 46: arm portion 48: central axis 50: cylindrical convex portion 52: valve stem slide hole 54: ring 82: set screw 90: ring-shaped fitting portion 92: skirt-shaped portion 94: annular groove

Claims (3)

[Claims] 1. A valve box comprising an inflow port, an outflow port, and a valve seat provided inside the inflow port, a valve element seated on the valve seat, and the valve element being mounted on the valve seat. A biasing coil spring; and a coil spring pressing member disposed in contact with the other end of the coil spring to be compressed and disposed on the outlet side of the valve box. At least two coil spring pressing members are provided on a side wall of the spring pressing member. A convex fitting portion is provided, and a groove-like recess through which the at least two convex fitting portions pass from the outside to the inside of the valve box, on an inner wall forming an outlet of the valve box,
A groove in which the at least two convex fitting portions are fitted halfway from the inside to the outside of the valve box. 2. The quick closing check valve according to claim 1, wherein the convex fitting portions are provided at positions substantially symmetric with each other around a center axis of the spring holding member. 3. A side wall of the spring holding member,
3. The quick-close check valve according to claim 1, wherein one or four of the convex fitting portions are provided.