JP2013061045A - Check valve and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve which keeps a mold structure simple and furthermore which allows a productivity to be improved and a water stop performance to be improved, and to provide a method of manufacturing the same.SOLUTION: The subject method is a method of manufacturing a tubular check valve having a water stop section 13 which leaves the upstream side opened and the downstream side opened/closed, including: forming the water stop section 13 of the check valve in a closed fashion to be integral; and cutting open the water stop section 13 that remains closed by moving a cutting means 2 (a blade 21, a laser light beam, or a water jet cutting process) to a side direction with respect to an axial direction.

Description

The present invention relates to a check valve that prevents backflow of downstream odors, sounds, gases, liquids, bubbles, and the like.

Conventionally, a check valve that prevents backflow of odors and sounds, gas, liquid, bubbles and the like from the downstream is sometimes used for drainage pipes, vent pipes, drainage vertical pipes and the like as appropriate.
One of the uses of such check valves is, for example, odors and pests from sewage called sealed water drain traps used in drains of drainage equipment such as washstands, sinks, and bathrooms. Although there is a device provided with sealed water so that it does not flow back to the indoor side, the check valve may be used as a substitute for such a sealed drainage trap.

As shown in FIG. 1, a conventional check valve is made of a material having elasticity such as elastomer or silicon, and is formed continuously from a cylindrical body formed on the upstream side and a cylindrical body, And a valve body having a water stop portion that is tapered toward a pair of upper and lower ends formed in an elastic plate shape in contact with each other. Further, the lower end of the valve body is disposed on the downstream side with respect to the cylindrical body.
The check valve of this conventional example is used in a drain pipe, particularly in a place where a conventional sealed drain trap is used, and operates as follows.
When drainage occurs, the drainage flows into the cylindrical body, and the water stop portion of the valve body opens due to stress such as the flow and weight of the drainage. When the water stop portion opens, the drainage is drained downstream of the drainage pipe, and finally drained into the sewer pipe. When the drainage is completed, the water stop portion of the valve body comes into contact with and closes by the elastic restoring force of confidence. By closing the mouth, odors and pests from the sewage pipe do not flow back upstream, that is, indoors.
In addition, as described above, in the water stop part, in order to prevent the sewage odors and pests from flowing back into the room, the close contact surface of the water stop part and the openness during drainage are profound in the performance of the check valve. Will be involved.

The above-described check valve is manufactured as follows.
The entire check valve is integrally molded. This molding method uses a direct pressure molding method in which a material such as rubber or silicon is placed in a mold and the mold is pressurized and heated.
As shown in FIG. 12, the check valve mold structure includes a lower mold, an upper mold, and a core mold.
As a mold for molding, a core mold is first disposed on a lower mold, and an upper mold is disposed on a core mold. When the upper mold and the lower mold are pressurized and heated, the check valve housing is integrally molded. At this time, by sandwiching the core mold between the lower mold and the upper mold, the water stop portion of the valve body of the check valve is molded with the core mold opened from the molding time point. . By forming the check valve in this way, the water stop portion that is deeply related to the adhesion at the time of water stop and the opening performance at the time of drainage is also formed in an open state.

As described above, the check valve manufactured in this way is disposed in the drainage pipe, with the tubular body disposed upstream and the valve body side disposed downstream.
The check valve is made of an elastic material such as silicone rubber or elastomer, so it is difficult to fix the check valve in the drain pipe by itself. Is attached to the cylindrical body of the check valve, and the adapter member is attached to the drainage pipe, thereby completing the installation of the check valve.

JP 2010-126894

The above-described check valve manufacturing method has the following problems.
Since a core mold is required to form the water stop portion, the mold structure is complicated, and the arrangement of the molds takes time and labor.
Further, as described above, since the core mold forms a water stop portion that is deeply related to the performance of the check valve, the core portion of the thickness of the water stop portion needs to be configured to be very thin. The core mold was worn by pressurization and heating, and could only be used several times.
Accordingly, the present invention provides a check valve that reduces the number of manufacturing steps and is simple in the manufacturing method.

The check valve and the manufacturing method thereof according to claim 1 of the present invention are a method for manufacturing a cylindrical check valve having a water stop portion 13 that is open on the upstream side and opened / closed on the downstream side. A check valve characterized in that the water stop portion 13 of the check valve is closed and integrally molded, and the water stop portion 13 is opened by moving the cutting means 2 in the lateral direction with respect to the axial direction. It is a manufacturing method.

A check valve and a manufacturing method thereof according to claim 2 of the present invention are the check valve manufacturing method according to paragraph 0008, wherein the cutting means 2 is a blade 21.

The check valve and the manufacturing method thereof according to claim 3 of the present invention are characterized in that the water stop portion 13 is cut open by moving the blade 21 in an arch shape in the lateral direction with respect to the axial direction. A check valve manufacturing method according to claim 1.

The check valve according to a fourth aspect of the present invention is the check valve according to any one of the paragraphs 0009 and 0010, wherein the check valve is incised by applying a slight vibration to the cutter 21 when the cutter 21 is incised. This is a check valve.

The check valve and the manufacturing method thereof according to claim 5 of the present invention are the check valve manufacturing method according to paragraph 0008, wherein the cutting means 2 is a laser beam 22.

The check valve and the manufacturing method thereof according to claim 6 of the present invention are the check valve manufacturing method according to paragraph 0008, wherein the cutting means 2 is a water jet cutting process.

The check valve according to claim 7 of the present invention is the check valve according to paragraphs 0008 to 0013, wherein the connection portion of the water stop portion 13 of the check valve is cut into a reverse U-shape in cross section. It is a check valve manufactured by the manufacturing method according to any one of the above.

In the check valve and the manufacturing method thereof according to claim 1 of the present invention, the water stop portion 13 of the check valve 1 is closed and molded integrally, and the cutting means 2 is moved in the lateral direction with respect to the axial direction. By cutting open the water-stopping portion 13 that is closed, the mold structure at the time of molding is simplified, and thus productivity is improved.
In the check valve and the manufacturing method thereof according to claim 2 of the present invention, since the cutting means 2 is the blade 21, the water stop portion 13 can be incised by simple processing, and the productivity is improved.
In the check valve and the manufacturing method thereof according to claim 3 of the present invention, the water stop portion 13 is cut open by moving the blade 21 in an arch shape in the lateral direction with respect to the axial direction. The degree of freedom of the incision shape is improved, for example, the incision shape can be an inverted C-shaped structure.
In the check valve and the manufacturing method thereof according to claim 4 of the present invention, when cutting with the blade 21, the blade 21 is cut by applying a slight vibration, so that the frictional force between the blade 21 and the cutting object is eliminated, and the blade is cut. The sharpness of 21 is improved and the efficiency of incision is improved. Therefore, productivity is improved.
In the check valve and the manufacturing method thereof according to claim 5 of the present invention, since the cutting means 2 is the laser beam 22, the degree of freedom in the incision shape of the water stop portion 13 is increased.
In the check valve and the manufacturing method thereof according to claim 6 of the present invention, since the cutting means 2 is water jet cutting, the degree of freedom of the incision shape of the water stop portion 13 is increased.
In the check valve according to claim 7 of the present invention, when the connection portion of the water stop portion 13 of the check valve 1 is cut into a cross-sectional reverse letter C shape, when the drainage is finished at the time of use ( The sealing force of the water stopping part 13 when the opening of the water stopping part is completed is improved, and the water stopping performance is improved when the water stopping part 13 is sealed.

It is a perspective view which shows a check valve. a) Top view of check valve. b) Side view of check valve. a) It is A-A 'sectional drawing in FIG. 2 a). b) It is B-B 'sectional drawing in FIG. 2 a). a) B-B 'sectional perspective view in FIG. 2 a). b) A-A 'cross-sectional perspective view in FIG. It is a perspective view which shows the manufacturing method of the non-return valve of a) thru | or d) this invention. (First Example) It is sectional drawing which shows the manufacturing method of the non-return valve of a) thru | or e) this invention. (First Example) It is sectional drawing which shows the manufacturing method of the non-return valve of a) thru | or e) this invention. (Second embodiment) It is sectional drawing which shows the manufacturing method of the non-return valve of this invention. (Third embodiment) It is sectional drawing which shows the manufacturing method of the non-return valve of this invention. (Fourth embodiment) a) thru | or e) It is sectional drawing which shows the other Example of this invention. It is sectional drawing which shows the metal mold | die structure of this invention. It is sectional drawing which shows the metal mold | die structure of a prior art example.

As shown in FIGS. 1 to 4, the check valve 1 of the present invention is made of a material having elasticity such as elastomer or silicone, and the cylindrical body 11 formed on the upstream side and the check valve 1 are The valve body 12 is formed continuously from the cylindrical body 11 and has a water stop portion 13 that is tapered toward a pair of upper and lower ends formed in an elastic plate shape whose tips abut against each other. The Further, the lower end of the valve body 12 is disposed on the downstream side with respect to the cylindrical body 11.
The check valve 1 of this embodiment is used in a drainage pipe, particularly in a place where a conventional sealed drainage trap is used, and operates as follows.
When the drainage occurs, the drainage flows into the cylindrical body 11, and the water stop portion 13 of the valve body 12 opens due to stress such as the flow and weight of the drainage. When the water stop portion 13 is opened, the drainage is drained downstream of the drainage pipe, and finally drained into the sewer pipe. When the drainage is completed, the water stop portion 13 of the valve body 12 is brought into contact with and closed by the elastic restoring force of confidence. By closing the mouth, odors and pests from the sewage pipe do not flow back upstream, that is, indoors.
Further, as described above, in the water stop part 13, the close contact surface of the water stop part 13 and the openness at the time of drainage have the same characteristics as the check valve 1 in order to prevent the sewage odor and pests from flowing backward into the room. It will be deeply related to performance.

The above-described check valve 1 is manufactured as follows.
The check valve 1 of the present embodiment is manufactured by integral molding, and the molding method is a direct pressure molding method in which a rubber material such as elastomer or silicon is installed in the mold, and the mold is pressurized and heated. Used.
As shown in FIG. 11, the mold structure of the check valve 1 includes a lower mold 4, an upper mold 3, and a core mold 5.
As a mold for molding, first, the core mold 5 is arranged on the lower mold 4, and the upper mold 3 is arranged on the core mold 5. When the upper mold 3 and the lower mold 4 are pressurized and heated, the housing of the check valve 1 is integrally molded in a form in which the water stop 13 is also connected (bridged).
After the molded product is taken out from the mold, the water-stopping portion 13 is incised by the blade 21 that is the cutting means 2.
As shown in FIGS. 5 and 6, the incision method is as follows.
The check valve 1 is fixed by a jig, and as shown in FIGS. 5A and 6A, the cylindrical body 11 of the check valve 1 is downstream (valve body 12 side) from the downstream side (valve body 12 side) to the upstream side (cylindrical body). 11) The cutter 21 is advanced in the direction, and the cutter 21 as the cutting means 2 is inserted toward the thickness portion formed integrally with the water stop portion 13 as shown in FIGS. 5b) and 6b). Then, the water stop part 13 is incised by the blade 21. Then, as shown in FIG. 5c) and FIG. 6c) to FIG. 6d), the water stop portion 13 is incised with an appropriate width by moving the cutter 21 by a preset operation width in the lateral direction with respect to the cylinder axis direction. Will be. When the incision is completed, the check valve 21 is extracted from the water stop portion 13 toward the downstream side (valve body 12 side) of the cylindrical body 11 from the water stop portion 13 as shown in FIGS. 5d) and 6e). 1 incision of the water stop portion 13 is completed.
The check valve 1 is completely manufactured by removing the check valve 1 from which the incision has been completed.
By comprising in this way, the water stop part 13 in which the adhesiveness performance at the time of water stop and the performance of the opening property at the time of drainage are deeply involved will also be formed in the opened state.

As described above, the check valve 1 manufactured in this manner is disposed in the drainage pipe, with the tubular body 11 disposed upstream and the valve body 12 disposed downstream.
The check valve 1 is made of an elastic material such as silicon rubber, so that it is difficult to fix the check valve 1 in the drain pipe by itself. By attaching to the tubular body 11 of the valve 1 and attaching the adapter member to the drainage pipe, the attachment of the check valve 1 is completed.

As a second embodiment, there is a check valve 1 described below.
The check valve 1 of this embodiment has the configuration and action described in paragraph 0017 above.
The check valve 1 of the present embodiment is manufactured as follows.
The check valve 1 of the present embodiment is manufactured by integral molding, and the molding method is a direct pressure molding method in which a rubber material such as elastomer or silicon is installed in the mold, and the mold is pressurized and heated. Used.
As shown in FIG. 11, the mold structure of the check valve 1 includes a lower mold 4, an upper mold 3, and a core mold 5.
As a mold for molding, first, the core mold 5 is arranged on the lower mold 4, and the upper mold 3 is arranged on the core mold 5. When the upper mold 3 and the lower mold 4 are pressurized and heated, the housing of the check valve 1 is integrally molded in a form in which the water stop 13 is also connected (bridged).
After the molded product is taken out from the mold, the water-stopping portion 13 is incised by the blade 21 that slightly vibrates as the cutting means 2.
The blade 21 that vibrates slightly is a blade 21 that generates fine longitudinal vibration. By applying such fine longitudinal vibration to the blade 21, the frictional force between the blade 21 and the cut object is reduced, and the sharpness is reduced. This will improve the efficiency of the incision.
Moreover, as a shape of the cutter 21, as shown in FIG. 7, it is set as the plate-shaped knife provided with the blade which became diagonal.
The incision method is as follows.
The check valve 1 is fixed by a jig, and the cutting means 2 extends from the downstream side (the valve body 12 side) of the cylindrical body 11 of the check valve 1 toward the upstream side (the cylindrical body 11). The blade that slightly vibrates is inserted toward the thickness portion formed integrally with the water stop portion 13. Then, the water stop part 13 is incised by the blade 21 that vibrates slightly. And the water stop part 13 will be incised suitably to a width | variety by moving the said cutter 21 by the operation | movement width | variety previously set to the side surface direction with respect to the cylinder axis direction. When the incision is completed, the blade 21 that vibrates slightly is extracted from the water stop portion 13 toward the downstream side (valve body 12 side) of the cylindrical body 11 in the cylinder axis direction. The incision is complete. In addition, although illustration is abbreviate | omitted, the operation | movement of the cutter 21 operate | moves as shown in FIG.5 and FIG.6.
After the incision is completed, the check valve 1 is removed from the jig, and the manufacture of the check valve 1 is completed.
By comprising in this way, the water stop part 13 in which the adhesiveness performance at the time of water stop and the performance of the opening property at the time of drainage are deeply involved will also be formed in the opened state.
Further, the drain pipe of the check valve 1 manufactured as described above is attached by the method described in the paragraph 0019 or the like.

As a third embodiment, there is a check valve 1 technique described below.
The check valve 1 of the present embodiment has the configuration and action described in paragraph 0017 above. Further, in the check valve 1 of this embodiment, the contact surface of the water stop portion 13 includes the center axis of the cylindrical body 11 and the longitudinal direction of the water stop portion 13 as shown in FIGS. 3a) and 8e). As shown in the top view of FIG. In addition, the reverse C-shape refers to a position where the valve bodies 12 are connected to each other in the valve body 12 of the check valve 1 (a position where the valve body 12 is not cut), specifically, the valve body 12 side (downstream side). It is the shape connected so that it may have a taper angle which reduces as it goes to a cylinder upper part side (upstream side).
Moreover, the check valve 1 of the present embodiment is manufactured as follows.
The check valve 1 of the present embodiment is manufactured by integral molding, and the molding method is a direct pressure molding method in which a rubber material such as elastomer or silicon is installed in the mold, and the mold is pressurized and heated. Used.
As shown in FIG. 11, the mold structure of the check valve 1 includes a lower mold 4, an upper mold 3, and a core mold 5.
As a mold for molding, first, the core mold 5 is arranged on the lower mold 4, and the upper mold 3 is arranged on the core mold 5. When the upper mold 3 and the lower mold 4 are pressurized and heated, the housing of the check valve 1 is integrally molded in a form in which the water stop 13 is also connected (bridged).
After the molded product is taken out from the mold, the water-stopping portion 13 is incised by the blade 21 that is the cutting means 2. The cutter 21 is configured so that the cutting edge rotates in an arch shape in the side surface direction with respect to the cylinder axis direction.
The incision method is as follows.
The check valve 1 is fixed by a jig, and the cylindrical body 11 of the check valve 1 is moved from the downstream side (valve body 12 side) to the upstream side (tubular body 11) as shown in FIG. 8b), the cutting tool 21 as the cutting means 2 is inserted toward the thickness portion formed integrally with the water stop portion 13 while keeping the angle. Then, the water stop part 13 is incised by the blade 21. In this way, by inserting the blade 21 into the water stop portion 13 at an angle, a reverse C-shaped cut of the water stop portion 13 is formed.
Then, when the blade 21 is rotated in an arch shape at a rotation angle set in advance in the lateral direction with respect to the cylinder axis direction as shown in FIGS. 8c) and 8d), the water stop portion 13 is incised to an appropriate width. Will be. Further, when the blade 21 comes to a certain place (the state shown in FIG. 8d), the rotation of the blade 21 is finished, and the blade 21 is removed from the water stop portion 13 as shown in FIG. The incision of the water stop portion 13 of the check valve 1 is completed by extracting the body 11 toward the downstream side (valve body 12 side) in the cylinder axis direction. Note that the blade 21 operates in an arch shape as indicated by an arrow on the drawing in FIG.
After the incision is completed, the check valve 1 is removed from the jig, and the manufacture of the check valve 1 is completed.
By comprising in this way, the water stop part 13 in which the adhesiveness at the time of water stop and the performance of the opening property at the time of drainage are deeply involved will also be formed in the opened state.
Further, the drain pipe of the check valve 1 manufactured as described above is attached by the method described in the paragraph 0019 or the like.
In addition, in the check valve 1 that constitutes a reverse-shaped connection portion in the present embodiment, the sealing force at the end of drainage is increased during use, and the water stop performance is improved.

Further, as a fourth embodiment, there is a check valve 1 described below.
The check valve 1 of this embodiment has the configuration and action described in paragraph 0017 above.
The check valve 1 of the present embodiment is manufactured as follows.
The check valve 1 of the present embodiment is manufactured by integral molding, and the molding method is a direct pressure molding method in which a rubber material such as elastomer or silicon is installed in the mold, and the mold is pressurized and heated. Used.
As shown in FIG. 11, the mold structure of the check valve 1 includes a lower mold 4, an upper mold 3, and a core mold 5.
As a mold for molding, first, the core mold 5 is arranged on the lower mold 4, and the upper mold 3 is arranged on the core mold 5. When the upper mold 3 and the lower mold 4 are pressurized and heated, the housing of the check valve 1 is integrally molded in a form in which the water stop 13 is also connected (bridged).
After the molded product is taken out from the mold, the water-stopping portion 13 is incised by the laser beam 22 as the cutting means 2.
The incision method is as follows.
As shown in FIG. 9, the check valve 1 is fixed by a jig, and the upstream side (tubular body 11) from the downstream side (valve body 12 side) of the cylindrical body 11 of the check valve 1 in the cylindrical axis direction. In the direction, the laser beam 22 as the cutting means 2 is irradiated toward a thickness portion formed integrally with the water stop portion 13. Then, the water stop portion 13 is incised by the laser beam 22. And the water stop part 13 will be incised to a suitable width | variety by moving the said laser beam 22 by the operation | movement width | variety preset in the side surface direction with respect to the cylinder axis direction. When the incision is completed, the irradiation of the laser beam 22 is terminated, and the incision of the water stop portion 13 of the check valve 1 is completed.
After the incision is completed, the check valve 1 is removed from the jig, and the manufacture of the check valve 1 is completed.
By comprising in this way, the water stop part 13 in which the adhesiveness performance at the time of water stop and the performance of the opening property at the time of drainage are deeply involved will also be formed in the opened state.
Further, the drain pipe of the check valve 1 manufactured as described above is attached by the method described in the paragraph 0019 or the like.

As a fifth embodiment, there is a check valve 1 described below.
The check valve 1 of this embodiment has the configuration and action described in paragraph 0017 above.
The check valve 1 of the present embodiment is manufactured as follows.
The check valve 1 of the present embodiment is manufactured by integral molding, and the molding method is a direct pressure molding method in which a rubber material such as elastomer or silicon is installed in the mold, and the mold is pressurized and heated. Used.
As shown in FIG. 11, the mold structure of the check valve 1 includes a lower mold 4, an upper mold 3, and a core mold 5.
As a mold for molding, first, the core mold 5 is arranged on the lower mold 4, and the upper mold 3 is arranged on the core mold 5. When the upper mold 3 and the lower mold 4 are pressurized and heated, the housing of the check valve 1 is integrally molded in a form in which the water stop 13 is also connected (bridged).
After the molded product is taken out from the mold, the water stop portion 13 is cut by a water jet cutting process, which is a cutting jet 2 that jets water at a high pressure.
Although not shown, the incision method is as follows.
The check valve 1 is fixed by a jig, and the cutting means 2 extends from the downstream side (the valve body 12 side) of the cylindrical body 11 of the check valve 1 toward the upstream side (the cylindrical body 11). The water jet jet which vibrates is jetted toward the thickness portion formed integrally with the water stop portion 13. If it does so, the water stop part 13 will be incised by the jet of a water jet cutting process. And the water stop part 13 will be incised to a suitable width | variety by moving the jet flow of the said water jet cutting | disconnection by the operation | movement width | variety preset in the side surface direction with respect to the cylinder axial direction. When the incision is completed, the incision of the water stop portion 13 of the check valve 1 is completed by interrupting the jet of the water jet cutting process.
After the incision is completed, the check valve 1 is removed from the jig, and the manufacture of the check valve 1 is completed.
By comprising in this way, the water stop part 13 in which the adhesiveness performance at the time of water stop and the performance of the opening property at the time of drainage are deeply involved will also be formed in the opened state.
Further, the drain pipe of the check valve 1 manufactured as described above is attached by the method described in the paragraph 0019 or the like.

Moreover, in the said Example, although the shaping | molding method of rubber is shape | molded by the direct pressure molding method, you may shape | mold by rubber injection molding.
Moreover, in the said Example, the insertion direction of the cutter 21, the irradiation direction of the laser beam 22, and the jet irradiation direction of the water jet cutting process are directed from the downstream side (the valve body 12 side) to the upstream side (the cylindrical body 11 side). However, as shown by a) to e) in FIG. 10, it may be performed in the reverse direction from the upstream side (tubular body 11 side) to the downstream side (valve body 12 side).

DESCRIPTION OF SYMBOLS 1 Check valve 11 Tubular body 12 Valve body 13 Water stop part 2 Cutting means 21 Blade 22 Laser beam 3 Upper metal mold 4 Lower metal mold 5 Core metal mold

Claims (7)

A method of manufacturing a cylindrical check valve having a water stop portion 13 that is open on the upstream side and opened / closed on the downstream side,
The non-return valve is characterized in that the water-stop portion 13 of the check valve is closed and integrally molded, and the closed water-stop portion 13 is opened by moving the cutting means 2 in the lateral direction with respect to the axial direction. Manufacturing method of valve. The check valve manufacturing method according to claim 1, wherein the cutting means 2 is a blade 21. The check valve manufacturing method according to claim 2, wherein the water stop portion 13 is cut open by moving the blade 21 in an arch shape in a lateral direction with respect to the axial direction. The check valve according to any one of claims 2 and 3, wherein the cutting is performed by applying a slight vibration to the blade 21 when the blade 21 is opened. The check valve manufacturing method according to claim 1, wherein the cutting means 2 is a laser beam 22. The check valve manufacturing method according to claim 1, wherein the cutting means 2 is a water jet cutting process. 7. The manufacturing method according to claim 1, wherein a connecting portion of the water stop portion 13 of the check valve is cut into a reverse U-shape when viewed in cross section. Check valve.

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