JP2014070764A - Strainer built-in piping joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a less-expensive strainer built-in piping joint showing a superior workability at the time of its inspection or maintenance work.SOLUTION: A strainer built-in piping joint 1 is constituted by a synthetic resin joint main body 2 comprising a fluid inlet 23, fluid outlet 24, flow passage 26 connecting these inlet and outlet, drain pipe 27 communicated with the flow passage 26 and strainer insertion port 25, and a strainer 4 stored in the flow passage 26 through the strainer insertion port 25. A screw-in type water-stopper valve 3 is threadably fitted to the strainer insertion port 25. When the water stopper valve 3 is screwed into a location where it is abutted against an end part of the strainer 4 stored in the flow passage 26, the water stopper valve fixes the strainer 4 at a prescribed position within the flow passage 26 and at the same time closes an opening part of the drain pipe 27. In addition, when the valve is unscrewed from this state to a prescribed position, the valve releases the opening part of the drain pipe 27.

Description

  The present invention relates to a synthetic resin pipe joint with a built-in strainer.

  In recent years, a heat pump water heater comprising a heat pump unit using a natural refrigerant such as carbon dioxide as a refrigerant and a hot water storage unit attached thereto has been attracting attention as a hot water supply apparatus friendly to the global environment. The heat pump unit and the hot water storage unit are connected via a water supply side pipe and a hot water supply side (boiling upper side) pipe, and the water supply side pipe is provided with a strainer to prevent contamination of the heat pump water heater. In addition, it is required to provide a water draining means for draining water from the water heater and bleeding air during inspection and maintenance.

  FIG. 8 shows a configuration of a strainer-incorporated pipe joint provided in a conventionally known heat pump type water heater. As is apparent from this figure, the strainer built-in pipe joint 100 of this example includes an inlet 101 for water supplied from the hot water storage unit via the water supply side pipe, and an outlet 102 for supplying this water into the heat pump unit. The drainage plug 103 communicating with the flow path connecting the inflow port 101 and the outflow port 102 and the insertion port 104 of the strainer (not shown) are integrally formed with a metal joint body 105. A water stop lid 106 is attached to the end face of the insertion port 104 with a screw 107. By removing the water stop lid 106 from the joint body 106, the strainer set in the flow path can be attached and detached (see FIG. (For example, see pages 4, 5, 7, and 8 of Non-Patent Document 1.) In the strainer built-in pipe joint 100 of this example, since the drain plug 103 is formed in the joint body 105 in which the strainer is built in, the water supply side pipe can be simplified.

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  However, since the conventional strainer built-in pipe joint 100 shown in FIG. 8 is made of metal, there is a problem that productivity is poor and expensive. Further, the conventional strainer built-in pipe joint 100 shown in FIG. 8 has the drain plug 103 and the screw 107 for fixing the water stop cover 106 to the joint body 105, so that the strainer is attached and detached. For this purpose, the opening / closing operation of the drain plug 103 and the attaching / detaching operation of the screw 107 must be performed, and there is a problem that workability at the time of inspection or maintenance is poor.

  The present invention has been made to solve such problems of the prior art, and an object of the present invention is to provide a strainer built-in pipe joint that is inexpensive and has good workability during inspection or maintenance. is there.

  In order to solve such a technical problem, the present invention provides a fluid inlet, a fluid outlet flowing in from the inlet, a drain section and a strainer communicating with a flow path connecting the inlet and the outlet. A synthetic resin joint body having an insertion port and a strainer accommodated in the flow path through the strainer insertion port, and a screw-type water stop valve is screwed onto the inner surface of the strainer insertion port. The female screw is engraved, and the water stop valve is screwed into the female screw so that the strainer housed in the flow path can be prevented from falling off. When screwed in until it comes into contact with the valve seat formed in the main body, the strainer is installed at a predetermined position in the flow path, and the drainage portion is closed to close the drainage from the drainage portion. Stop, when unscrewing from this state to a predetermined position, characterized in that to allow drainage from the draining unit the draining portion to open the opening of the.

  According to this configuration, since the joint body can be manufactured with a synthetic resin molded product, the fluid inlet and outlet, the flow path connecting the inlet and outlet, the drainage portion, and the strainer insertion port have a complicated shape. The joint body can be manufactured at low cost. In addition, by screwing a screw-type water stop valve into the joint body and changing the screwing position of the water stop valve with respect to the joint body, drainage from the drainage part and stoppage of drainage, and attachment / detachment of the strainer to the joint body are performed. Since it can be performed, the inspection work and maintenance work of the equipment provided with the strainer built-in pipe joint can be facilitated.

  Further, the present invention provides the strainer-incorporated pipe joint having the above-described structure, in which ring-shaped valve seats are formed on the inner periphery of the joint body and the outer periphery of the water stop valve, respectively, and a seal member is provided between these valve seats. Disposing and stopping the drainage from the drainage portion by closely contacting each valve seat via the seal member, and when the water stop valve is screwed back to a predetermined position from this state, A flow path communicating with the opening of the drainage portion is formed between the drainage portions to allow drainage from the drainage portion.

  According to such a configuration, since the ring-shaped valve seats are formed on the inner periphery of the joint body and the outer periphery of the water stop valve, respectively, the water stop portion can be configured simply by placing an O-ring between these valve seats. With a simple configuration, drainage from the drainage part or drainage stop can be reliably performed.

  Further, in the pipe joint with a built-in strainer according to the present invention, the water stop valve is formed of a synthetic resin material that is the same or different from the joint body, and is formed at one end protruding outward from the joint body. The handle for facilitating the rotation operation is integrally formed.

  According to this configuration, since the water stop valve is formed of a synthetic resin material, a water stop valve having a complicated shape can be manufactured at low cost. In addition, since the handle is integrally formed at one end of the water stop valve, no tools or jigs are required to rotate the water stop valve, and the water stop valve can be easily rotated. .

  According to the present invention, a joint body made of a synthetic resin having a fluid inlet, a fluid outlet flowing in from the inlet, a drain portion communicating with the flow path connecting the inlet and the outlet, and a strainer insertion port Therefore, the strainer built-in pipe joint can be reduced in cost compared to the case where the metal joint body is provided. In addition, by rotating the screw-in type water stop valve that is screwed into the joint body, drainage from the drain part and stoppage of drainage and attachment / detachment of the strainer to / from the joint body are performed. Inspection work and maintenance work of the equipment provided can be facilitated.

It is a perspective view of a strainer built-in pipe joint concerning an embodiment. It is a disassembled perspective view of the piping joint with a built-in strainer which concerns on embodiment. It is a front view of a strainer built-in pipe joint concerning an embodiment. It is a bottom view of the pipe joint with a built-in strainer according to the embodiment. It is AA sectional drawing of FIG. It is sectional drawing of the strainer built-in piping joint which concerns on embodiment in the water draining state. It is BB sectional drawing of FIG. It is a perspective view of the strainer built-in piping joint which concerns on a prior art example.

  Hereinafter, an embodiment of a pipe joint with a built-in strainer according to the present invention will be described with reference to the drawings.

  As shown in FIG. 2, the strainer built-in pipe joint 1 according to the embodiment includes a synthetic resin joint body 2, a synthetic resin water stop valve 3 screwed into the joint body 2, and a joint body 2. The strainer 4 is detachably stored. As a synthetic resin material for forming the joint body 2 and the water stop valve 3, polyamide, polypropylene, polyethylene, vinyl chloride, fluororesin, or the like can be used. The joint body 2 and the water stop valve 3 can be formed of the same kind of synthetic resin material, or can be formed of different kinds of synthetic resin materials.

  As shown in FIGS. 1 to 7, the joint body 2 is connected to a main pipe portion 21 and one end of the main pipe portion 21 in the longitudinal direction of the main pipe portion 21, and is an orthogonal pipe portion arranged at a right angle to the main pipe portion 21. 22. In addition, a fluid inflow port 23 is formed at the tip of the orthogonal tube portion 22, and the fluid flowing in from the inflow port 23 is respectively input to both ends of the main tube portion 21, such as a heat pump unit of a heat pump hot water heater. Are formed, and an outlet 24 for supplying and removing the strainer 4 is formed. Therefore, a right-angled flow path 26 is formed between the inflow port 23 and the outflow port 24 as shown in FIG. Further, as shown in FIGS. 1 and 4 to 6, a drain pipe (drain section) 27 communicating with the flow path 23 is formed on the joint body 2 on the strainer insertion port 25 side. As is clear from these drawings, the drain pipe 27 is disposed at a right angle to the main pipe portion 21 and the orthogonal pipe portion 22.

  As shown in FIGS. 5 and 6, a female screw 25 a for screwing the water stop valve 3 is engraved on the inner periphery of the strainer insertion opening 25. In addition, a ring-shaped valve seat 25b made of an inclined surface is formed at a position that is biased toward the outflow port 24 relative to the formation position of the drain pipe 27 on the inner periphery of the strainer insertion port 25. This valve seat 25b opens and closes the drain pipe 27 in cooperation with the valve seat of the water stop valve 3 described in detail later. Further, an engagement step portion 28 for holding the strainer 4 at a fixed position is formed at the inner peripheral central portion of the main pipe portion 21.

  A flange 29 for fixing the flange built-in pipe joint 1 to a device such as a heat pump unit is formed on the inlet 23 side of the joint body 2. As shown in FIG. 1, the flange 29 is provided with a bolt through hole 29a. By fastening a bolt (not shown) penetrating into the bolt through hole 29a to a device such as a heat pump unit, the flange built-in pipe joint 1 can be fixed to the device. Although only one bolt through hole 29a is shown in FIG. 1, it is desirable to open a plurality of bolt through holes 29a in order to securely fix the flange built-in pipe joint 1 to the device.

  The water stop valve 3 includes a screwing portion 31 and a handle 32 formed at one end of the screwing portion 31. The threaded portion 31 is provided with a male screw 31a that can be screwed into a female screw 25a formed on the inner periphery of the strainer insertion opening 25. Further, a ring-shaped valve seat 31b having an inclined surface parallel to the valve seat 25b is formed on the tip side of the position where the male screw 1a is formed, and an O-ring (seal member) 33 is formed on the valve seat 31b. Is set. When the water stop valve 3 is screwed into the strainer insertion port 25 of the joint body 2 and the handle 32 is rotated in the tightening direction, the valve seat 31b and the O-ring 33 advance toward the valve seat 25b. When the valve seat 31b and the O-ring 33 exceed the opening of the drain pipe 27, as shown in FIG. 5, the O-ring 33 is brought into close contact with the valve seat 25b, and drainage from the drain pipe 27 is stopped. . Further, when the handle 32 is rotated in the reverse direction from this state, the valve seat 31 b and the O-ring 33 are retracted toward the opening end side of the strainer insertion port 25. When the O-ring 33 is separated from the valve seat 25b, as shown in FIG. 6, the flow path 26 and the opening of the drain pipe 27 communicate with each other, and the fluid in the flow path 26 passes outside through the drain pipe 27. Discharged.

  As described above, the strainer built-in pipe joint 1 according to this embodiment has the handle 32 integrally formed at one end portion of the water stop valve 3, so that a tool or a jig is required to rotate the water stop valve 3. Therefore, the rotation operation of the water stop valve 3 can be facilitated. Further, ring-shaped valve seats 25b and 31b are formed on the inner periphery of the joint body 2 and the outer periphery of the water stop valve 3, respectively, and an O ring 33 is disposed between these valve seats to constitute a water stop portion. Therefore, the drainage or drainage stop from the drain pipe 27 and the air vent or the air vent stop can be reliably performed with a simple configuration.

  As shown in FIGS. 2 and 5 to 7, the strainer 4 includes a synthetic resin casing 41 and a filtering member 42 attached to a tip portion of the casing 41. The housing 41 includes a ring-shaped contact portion 41 a that contacts the tip of the water stop valve 3, a ring-shaped engagement portion 41 b that engages with an engagement step portion 28 formed on the joint body 2, It consists of a plurality of rod-like connecting parts 41c that connect the contact part 41a and the engaging part 41b, and a bowl-shaped filter member holding part 41d formed on one side of the connecting part 41c. The filter member 42 is formed with a mesh-like member formed into a bottomed cylindrical shape, and is installed on the inner peripheral side of the filter member holding portion 41d. The casing 41 is formed of a synthetic resin material that is the same as or different from the synthetic resin material that forms the joint body 2 and the water stop valve 3. On the other hand, the filter member 42 is formed with a metal mesh or a punched metal plate.

  The strainer 4 configured as described above is inserted into the joint body 2 from the strainer insertion port 25 with the filtering member holding portion 41d facing the outflow port 24 side. After the insertion, when the male screw 31a engraved on the outer periphery of the water stop valve 3 is screwed into the female screw 25a engraved on the inner periphery of the strainer insertion port 25, the water stop valve 3 is tightened to its forward end. As shown in FIG. 5, the distal end portion of the water stop valve 3 comes into contact with the contact portion 41 a of the strainer 4, and the engagement portion 41 b of the strainer 4 engages with the engagement step portion 28 of the joint body 2. Thereby, the strainer 4 is held at a predetermined position in the flow path 26.

  When the strainer 4 is held at a predetermined position in the flow path 26, the connecting portion 41c of the strainer 4 faces the fluid outlet 22a of the orthogonal pipe portion 22 formed in the joint body 2 as shown in FIG. Placed in. Therefore, as shown in FIG. 7, the fluid introduced into the joint body 2 from the inflow port 23 flows into the inside of the filter member 42 through between the connecting portions 41c, passes through the side surface of the filter member 42, and flows. It flows out from the outlet 24 to the outside. Thereby, the dust in the fluid is captured by the filtering member 42.

  As described above, in the strainer built-in pipe joint 1 according to the present embodiment, since the joint body 2, the water stop valve 3, and the housing 41 of the strainer 4 are made of a synthetic resin molded product, these members having complicated shapes. Can be manufactured at low cost, and the cost of the strainer-incorporated pipe joint can be reduced as compared with that made of metal. Further, the strainer built-in pipe joint 1 according to the present embodiment includes a drainage pipe by screwing a screw-type water stop valve 3 into the joint body 2 and changing the screwing position of the water stop valve 3 with respect to the joint body 2. Since the drainage from 27 and the drainage stop (including air venting) and the strainer 4 can be attached to and detached from the joint body 2, the inspection work of equipment such as a heat pump water heater provided with the strainer built-in pipe joint 1 and Maintenance work can be facilitated.

  The gist of the present invention is that the screw-type water stop valve 3 is screwed into the joint body 2 and the screwing position of the water stop valve 3 with respect to the joint body 2 is changed to thereby drain and drain the water from the drain pipe 27. This is because the stop and the strainer 4 can be attached to and detached from the joint body 2, and the shape and configuration of the other parts can be changed as appropriate.

  Moreover, in the said embodiment, although demonstrated taking the example of the strainer built-in piping joint mainly applied to a heat pump type water heater, the summary of this invention is not limited to this, The shape of each part is changed suitably. Therefore, a strainer built-in pipe joint applicable to other applications can be obtained.

  The present invention can be used for a piping line equipped with a strainer and a drain.

DESCRIPTION OF SYMBOLS 1 Strainer built-in piping joint 2 Joint main body 3 Water stop valve 4 Strainer 21 Main pipe part 22 Orthogonal pipe part 22a Fluid outlet 23 Inlet 24 Outlet 25 Strainer insertion port 25a Female thread 25b Valve seat 26 Flow path 27 Drain pipe 28 Engagement stage Part 29 Flange 29a Bolt through hole 31 Screwing part 31a Male thread 31b Valve seat 32 Handle 33 O-ring 41 Housing 41a Abutting part 41b Engaging part 41c Connecting part 41d Filtration member holding part 42 Filtration member

Claims (3)

A synthetic resin joint body having a fluid inlet, a fluid outlet flowing in from the inlet, a drainage portion communicating with the flow path connecting the inlet and the outlet, and a strainer insertion port, and the strainer insertion A strainer housed in the flow path through the mouth,
A female screw for screwing a screw-in type water stop valve is engraved on the inner surface of the strainer insertion port, and the water stop valve is screwed into the female screw so that the water screw is housed in the flow path. The strainer can be prevented from falling off.
When the water stop valve is screwed in until it comes into contact with a valve seat formed on the joint body, the strainer is installed at a predetermined position in the flow path, and the opening of the water draining portion is closed to close the water stop valve. Built-in strainer characterized in that when drainage from the drainage part is stopped and screwed back to a predetermined position from this state, the drainage part is opened to allow drainage from the drainage part. Piping joint.   Ring-shaped valve seats are formed on the inner periphery of the joint body and the outer periphery of the water stop valve, respectively, and a seal member is disposed between the valve seats, and the valve seats are disposed via the seal members. A flow path that communicates with the opening of the drainage portion between the valve seats when the drainage from the drainage portion is stopped by close contact and the water stop valve is screwed back to a predetermined position from this state. The strainer built-in pipe joint according to claim 1, wherein drainage from the drain part is made possible.   The water stop valve is formed of the same or different type of synthetic resin material as the joint body, and a handle for facilitating the rotation operation is integrally formed at one end protruding outward from the joint body. The strainer-incorporated pipe joint according to any one of claims 1 and 2.