JPH0953736A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve constituted simply from few parts, easily assembled and used also for liquid including solid matters. SOLUTION: A check valve consists of two parts of a holding tube 1 and a tubular valve body 2 of elastic material. The upstream side part 1b of the holding tube 1 is fixed in the upstream part 3a of a piping 3. The proximal end 2a of the elastic tubular body 2 is fixedly fitted in the downstream part 1a of the holding tube 1 projecting into the downstream part 3b of the piping 3. A flat part 2b projecting to the downstream side of the holding tube 1 and increasing the width toward the tip side while reducing the thickness is formed integrally with the tip side of the proximal end 2a. Opposed ends 2c of the tip in which the flat parts 2b are pressed against each other are located in the downstream part 3c of the piping 3 so that, only when pressure in the upstream part 3a of the piping 3 is higher than pressure in the downstream part 3a by a predetermined values, the flat part 2b is elastically deformed to open the opposed part 2c of the tip and send liquid flow from the upstream part 3a to the downstream part 3c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve provided in a pipe forming a fluid passage and allowing a fluid such as a liquid to flow linearly in only one direction.

[0002]

2. Description of the Related Art Conventionally, a check valve that allows a fluid such as a liquid to flow only in one direction has been widely used. However, a valve body and a valve casing that accommodates the valve body openably and closably and is connected to a pipe are used. In general, the valve body is held in the valve casing by using a spring or a shaft.

[0003]

The above-mentioned conventional check valve is troublesome to manufacture and assemble, because of the large number of constituent parts and the complicated structure of parts such as the housing. There was a problem that it became expensive. The present invention solves the above-mentioned problems, has a small number of parts, has a simple configuration of these parts, can be easily assembled, and can be used for a fluid such as a liquid containing a solid substance. It is intended to provide a stop valve.

[0004]

A check valve according to a first aspect of the present invention comprises a holding cylinder for fixing an upstream side portion in a pipe, and a base end fitted and fixed to an outer peripheral surface of a downstream side portion of the holding cylinder. A cylindrical valve body made of an elastic material in which a flat portion that protrudes to the downstream side of the portion and the holding cylinder, increases in width toward the tip side, and decreases in thickness, and the tip facing portion of this flat portion is press-contacted so that it can be opened. It will be.

According to a second aspect of the present invention, in the check valve according to the first aspect, the tubular valve element is an integrally molded product of elastic synthetic resin. According to a third aspect of the present invention, in the check valve according to the first aspect, the tubular valve body is formed by forming a member of a fiber-reinforced resin sheet into a member that is symmetrically divided into two along the axial direction. The joining edge portions that are respectively projected to the outside of the facing edges of the members are overlapped and fixed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Each embodiment of the present invention will be described with reference to the drawings. As shown in each of FIGS. 1 to 6, the check valve of the first embodiment includes a holding cylinder 1 and a tubular valve body 2, and the holding cylinder 1 is a cylinder made of a hard synthetic resin such as hard vinyl chloride. Is. Further, the tubular valve body 2 is an integrally molded product made of an elastic synthetic resin such as soft vinyl chloride, and is located at the downstream side in the liquid flow direction from the distal end of the cylindrical proximal end 2a.
Is crushed from above and below, that is, the width is increased toward the tip side and the flat portion 2b formed into a tubular shape whose thickness is reduced upward and downward is projected, and the flat portion 2b is opposed to the upper and lower portions. The leading end facing portion 2c is pressed so as to be opened.

The cylindrical base end portion 2a of the tubular valve body 2 is fitted and fixed to the outer peripheral surface of the downstream side portion 1a of the holding cylinder 1 by an appropriate means such as adhesion, and the cylinder is moved from the downstream end of the holding cylinder 1 to the cylinder. The flat portion 2b of the valve body 2 is projected to the downstream side, and the tip facing portion 2c thereof is brought into pressure contact. To use the check valve of the first embodiment having the above-described configuration, as illustrated in FIG. 6, the upstream side portion of the holding cylinder 1 is provided in the upstream portion 3a having a small inner diameter of the horizontal pipe 3 forming the fluid passage. 1b is fitted and fixed by an appropriate means such as adhesion, and the proximal end portion 2a is attached to the downstream side portion 1a and the downstream side portion 1a of the holding cylinder 1.
The entire tubular valve body 2 fitted and held by the
a large-diameter downstream portion 3c connected to the downstream side of a through a step 3b
It is accommodated with a gap in between.

In this state, as shown by the arrow in FIG. 6, by pumping the liquid to the upstream portion 3a of the pipe 3, the liquid passes through the holding cylinder 1 and into the flat portion 2b of the tubular valve body 2. By entering and elastically deforming the flat portion 2b by the pressure of the liquid so as to approach a circular cross section, the tip facing portion 2c opens, and the liquid flows out to the downstream portion 3c of the pipe 3. When the pressure feeding of the liquid to the upstream portion 3a of the pipe 3 is stopped, the flat portion 2b of the tubular valve body 2 returns to the shape before the liquid feeding by the elastic restoring force, and the tip facing portion 2c of the flat portion 2b is removed. Press and close.

When the upstream portion 3a of the pipe 3 has a negative pressure, suction force acts on the flat portion 2b of the tubular valve body 2,
The internal volume is reduced, the flat portion 2b is elastically deformed, the tip facing portion 2c is strongly pressed, and the liquid does not flow backward from the downstream portion 3c side of the pipe 3 to the upstream portion 3a. Further, even when the downstream portion 3c of the pipe 3 has a high pressure, the flat portion 2b of the tubular valve body 2 is elastically deformed and the downstream portion of the pipe 3 has the same pressure as when the upstream portion 3a has a negative pressure. The liquid does not flow back from the 3c side to the upstream portion 3a. Therefore, only when the pressure in the upstream portion 3a of the pipe 3 is higher than the pressure in the downstream portion 3c by a predetermined value or more, the flat portion 2b elastically deforms to open the tip facing portion 2c, and the liquid from the upstream portion 3a to the downstream portion 3c is opened. Flows, downstream part 3
No backflow from c occurs.

The check valve of the first embodiment is composed of two parts, a holding cylinder 1 and a tubular valve body 2, has a small number of constituent parts, and the holding cylinder 1 may be a hard synthetic resin cylinder. Valve body 2
Is made of an elastic material, and is integrally provided with a flat portion 2b downstream of the cylindrical base end portion 2a, the width of which is increased toward the tip and the thickness of which is reduced in the vertical direction, and the tip facing portion 2c is pressed against the flat portion 2b. Since the holding cylinder 1 and the tubular valve body 2 are simple in construction, the base end portion 2a of the tubular valve body 2 is fitted and fixed to the outer peripheral surface of the downstream side portion 1a of the holding cylinder 1 even when these are assembled. You can easily do that.

Further, in the check valve of the first embodiment, not only the liquid but also the liquid containing the solid matter is supplied to the upstream portion 3 of the pipe 3.
a through the holding cylinder 1 and the tubular valve body 2 and elastically deforming so that the cross section of the flat portion 2b of the tubular valve body 2 approaches a circular shape, and the tip facing portion 2c is opened, and the downstream side of the pipe 3 It can be flown to the portion 3c, and the solid matter contained in the liquid does not get caught in the open tip facing portion 2c. The flat portion 2b of the cylindrical valve body 2, particularly the tip facing portion 2 thereof, when the liquid is not pumped
When a solid substance is contained in c, the solid substance is hermetically sealed in the flat portion, and the valve action is not hindered.

FIG. 7 shows a modified example of the check valve of the first embodiment. In this modified example, the distal end portions of the downstream side portion 1a of the holding cylinder 1 are made symmetrical with each other at upper and lower positions. Of the flat portion 2b provided on the tubular valve body 2 near the base end 2a.
It supports the lower part. The configuration and use of the check valve according to this modification other than those described above are the same as those of the check valve of the first embodiment described above, and the same actions and effects as this can be obtained. The same reference numerals as those in FIGS. 1 to 5 in FIG. 7 denote the same or corresponding parts.

The check valve of the second embodiment, as shown in each of FIGS. 8 to 11, is made of a fiber reinforced resin sheet in which the tubular valve body 4 is symmetrically divided into two vertically and axially symmetrically. It is composed of upper and lower members 4d and 4d made of molded products, and these members 4
d and 4d, the joining edge portions 4 respectively protruding outside the facing edges
e, 4e are overlapped, and the opposing surfaces of these joint edge portions 4e, 4e are fixed by adhesion with an adhesive or the like. From the tip of the cylindrical base end portion 4a to the downstream side in the liquid flow direction, and toward the tip side. Cylindrical flat part 4 that increases the width and reduces the thickness
b is projected, and the tip facing portions 2c facing the top and bottom of the flat portion 2b are pressed against each other.

The structure of the check valve of the second embodiment other than that described above is substantially the same as that of the check valve of the first embodiment, and is similar to that of FIGS. 1 to 6 in FIGS. The same reference numerals denote the same or corresponding parts.

The check valve of the second embodiment is similar to the check valve of the first embodiment in use, action and effect, but the strength can be increased. The fiber-reinforced plastic forming the tubular valve body 4 of the check valve according to the second embodiment uses glass fibers or the like having a high strength as fibers, and silicone resin as the resin improves heat resistance. It is possible and preferable.

In the check valve of the second embodiment, upper and lower cutouts are formed at the tip of the downstream side portion of the holding cylinder as shown in FIG. Base part 4 of part 4b
You may support the upper part and lower part of the part near a.

In the check valve of the third embodiment, as shown in FIGS. 12 and 13, the cylindrical valve body 5 has a cylindrical base end portion 5a, which is located downstream from the tip end of the base end portion 5a in the flow direction of the liquid. A flat portion 5b formed in a tubular shape having a width equal to the outer diameter of 5a and having a thickness reduced in the upper and lower directions is projected, and is opposed to the upper and lower sides of the flat portion 5b and is longer than the tip facing portion 2c of the first embodiment. Tip facing part 5c
Is pressed so that it can be opened.

The structure of the check valve of the third embodiment other than that described above is substantially the same as that of the check valve of the first embodiment, and FIGS. 1 to 6 in FIGS. The same reference numerals denote the same or corresponding parts. The use, operation, and effect of the check valve of the third embodiment are similar to those of the first embodiment.

In the present invention, the end portion of the tubular valve body facing the distal end can be reliably prevented from leaking liquid by increasing the axial length, and the axial length can be up to about 1 to 3 times the width dimension. Can be long In the present invention, the flat portion of the tubular valve body is not limited to the one in which the thickness (height) is reduced in the vertical direction toward the tip side, but is rotated 90 ° to the left and right in the thickness direction. You may make it decrease toward. The check valve according to the present invention can be used not only for pumping a liquid but also for pumping a gas, and can also be used for transporting a solid matter together with a fluid.

[0020]

The check valve according to the invention of claim 1 comprises two parts, a holding cylinder and a tubular valve body, has a small number of constituent parts, and the holding cylinder may be a cylinder. The body is made of an elastic material, and a flat part that increases in width toward the tip side and decreases in thickness is provided on the downstream side of the cylindrical base end portion, and the tip facing portion is pressed and held. The structure of the cylinder and the tubular body is simple, and these can be easily assembled by fitting and fixing the proximal end of the tubular valve body on the outer peripheral surface of the downstream side of the holding cylinder. Can be provided to.

Further, not only fluid such as liquid but also fluid containing solid matter is passed from the upstream portion of the pipe forming the fluid passage through the holding cylinder and the tubular valve body to traverse the flat portion of the tubular valve body. It is elastically deformed so that the surface approaches a circle, the tip facing part of the flat part is opened, and it can be flowed to the downstream side, and solid matter that has entered the fluid does not get caught in the opened tip facing part, It can also be used to convey solid matter by fluid.

When the fluid is stopped from being pumped, the flat portion returns to the shape before the operation due to the elastic restoring force, the tip facing portion is pressed and closed, and the outflow of the fluid to the downstream side is stopped. Further, when solid matter enters the tip facing portion of the flat portion when the pressure feeding of the fluid is stopped, the solid matter is hermetically sealed in the flat portion without any trouble in valve action. Furthermore, only when the pressure in the upstream portion of the pipe becomes higher than the pressure in the downstream portion by a predetermined value or more, the flat portion elastically deforms and the tip facing portion opens, so that no backflow from the downstream portion occurs.

According to a second aspect of the present invention, in the check valve according to the first aspect, since the tubular valve element is an integrally molded product of elastic synthetic resin, in addition to the effect of the first aspect of the invention described above. The tubular valve body can be easily manufactured. According to a third aspect of the present invention, in the check valve according to the first aspect, the tubular valve element is constituted by a member made of a molded product of a fiber strong resin sheet symmetrically divided into two along the axial direction. Since the joining edge portions which are respectively projected to the outer sides of the opposing edges are overlapped and fixed to each other, the configuration is slightly complicated but the strength is larger than that of the invention of claim 2 described above, and the same effect as the invention of claim 1 is obtained. can get.

[Brief description of drawings]

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

FIG. 2 is a plan view of the check valve shown in FIG. 1;

FIG. 3 is a front view of the check valve shown in FIG.

FIG. 4 is a rear view of the check valve shown in FIG.

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a vertical cross-sectional side view of the check valve according to the first embodiment of the present invention in use.

FIG. 7 is a vertical sectional side view showing a modification of the check valve according to the first embodiment of the present invention.

FIG. 8 is a side view showing a check valve according to a second embodiment of the present invention.

9 is a plan view of the check valve shown in FIG.

10 is a front view of the check valve shown in FIG.

FIG. 11 is a vertical cross-sectional side view of the check valve according to the second embodiment of the present invention in use.

FIG. 12 is a plan view of the check valve according to the third embodiment of the present invention.

13 is a vertical sectional side view of the check valve shown in FIG.

[Explanation of symbols]

 1 Holding Cylinder 1a Downstream Side 1b Upstream Side 1c Notch 2 Cylindrical Valve Body 2a Base End 2b Flat 2c Tip Facing Part 3 Piping 3a Upstream 3b Stage 3c Downstream 4 Cylindrical Valve 4a Base End 4b Flat portion 4c Tip facing portion 4d Upper and lower members 4e Joining edge portion 5 Cylindrical valve body 5a Base end portion 5b Flat portion 5c Tip facing portion

Claims (3)

[Claims] 1. A holding cylinder for fixing an upstream side portion in a pipe,
Providing a base end portion fitted and fixed to the outer peripheral surface of the downstream side portion of the holding cylinder and a flat portion projecting to the downstream side of the holding cylinder to increase the width toward the tip side and reduce the thickness, the tip facing portion of this flat portion. And a tubular valve body made of an elastic material, which is in pressure contact with the valve so as to be opened. 2. The check valve according to claim 1, wherein the tubular valve body is an integrally molded product of elastic synthetic resin. 3. A joint edge portion in which a tubular valve element is formed by molding a member of a fiber reinforced resin sheet into two members symmetrically divided along an axial direction, and these members are respectively projected to the outer sides of the facing edges of these members. The check valve according to claim 1, wherein the check valves are overlapped and fixed.