JP4288078B2 - Switching mechanism of valve body in switching valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used in, for example, a faucet of a water supply, and is a valve in a switching valve that can discharge raw water as it is, discharge it with a shower, improve water quality such as a water purifier or a water heater, and supply it to a heating device. The present invention relates to a body switching operation mechanism.
[0002]
[Prior art]
The selector valve attached to the faucet of the water supply is the raw water straight mode that discharges raw water straight from the faucet, the raw water shower mode that discharges raw water in the shower mode, and the raw water is once supplied to the water purifier that has been placed outside. It was possible to switch between the water purification straight mode to discharge straight. The following has been conventionally proposed as this switching valve. That is, a horizontal cylindrical spool that is reciprocally rotated at a predetermined position in a storage chamber formed in the valve housing is reciprocally accommodated by an externally operable operation knob. The spool is formed with a plurality of communication passages through which raw water inlets formed in the valve housing and a plurality of raw water passages can communicate with each other. A spherical valve element is accommodated in each communication passage. Then, when the spool is rotated by operating the operation knob, the plurality of spherical valve bodies open or close the starting end opening of the raw water passage, that is, the valve hole, and selectively switch between the three discharge modes. Is to be done.
[0003]
The three discharge modes are displayed at a predetermined pitch in the circumferential direction on the outer peripheral surface of the operation knob, and three discharges of the operation knob are provided on the outer peripheral surface of the boss portion supporting the spool of the valve housing. Marks such as display protrusions or display lines serving as a reference are provided so as to correspond to any one of the modes.
[0004]
[Problems to be solved by the invention]
However, in the conventional switching valve, since the bearing is only fastened and fixed to the boss portion with a single screw, the coupling between the boss portion and the bearing is weak, and the rotating operation shaft is rotated by the operation knob. When moving, there is a problem that the position of the bearing slightly changes and the assembled state cannot be stably maintained. Although it is conceivable to use two screws to securely fix the boss portion and the bearing, when the head portion of the screw is exposed on the outer peripheral surface of the boss portion, another problem arises that the appearance is impaired.
[0005]
In addition, the marks on the outer peripheral surface of the boss portion of the valve housing, such as the display protrusions or the display lines, have only such a function, and do not have the function of connecting the bearing to the boss portion. It was.
[0006]
The present invention eliminates the problems in the prior art described above, ensures the assembly state of the bearing assembled to the boss portion of the valve housing, and does not impair the appearance of the outer peripheral surface of the boss portion. An object of the present invention is to provide a valve body switching operation mechanism.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a valve body for switching a flow path of raw water with respect to a valve chamber provided in a valve housing is rotated by a rotating operation shaft to switch positions. In a switching valve in which a bearing that supports the rotating operation shaft is fitted to an inner peripheral surface of a boss portion provided in the valve housing and is connected to an outer knob of the rotating operation shaft, A positioning screw is screwed onto the bearing from the outer peripheral surface of the boss portion of the valve housing, and a positioning pin is inserted and fixed to the bearing, and the outer end of the positioning pin is connected to the outer peripheral surface of the operation knob. The gist is that a mark function as a reference for the plurality of ejection modes provided is provided.
[0008]
The gist of a second aspect of the present invention is that, in the first aspect, the positioning pin has a spherical outer end.
According to a third aspect of the present invention, in the first or second aspect, a slit is formed at the base end portion of the positioning pin, and a locking convex portion is formed at the outer peripheral surface of the positioning pin corresponding to the slit. The gist of the present invention is that this locking projection is locked to a locking recess formed on the inner peripheral surface of the bearing insertion hole.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a switching valve embodying the present invention will be described with reference to the drawings.
As shown in FIG. 10, the switching valve 11 is attached to the tip opening of the faucet 12, and the raw water is guided to the water purifier 15 through the first conduit 14 by rotating the on-off valve 13 provided in the faucet 12. It is like that. Further, the purified water purified by the water purifier 15 is introduced into the switching valve 11 and the purified water is discharged straight. The switching valve 11 is configured to be switchable between a mode in which the raw water is discharged straight and a shower mode in which the raw water is discharged in a shower.
[0010]
As shown in FIGS. 1, 3 and 9, the valve housing 17 constituting the switching valve 11 is integrally formed with a boss portion 17b formed with an introduction port 17a for introducing raw water from the tap 12 as shown in FIGS. . A packing 18 is fitted on the inner peripheral surface of the boss portion 17b, and a tightening nut 19 is screwed onto a male screw portion formed on the outer periphery of the boss portion 17b with the tip edge of the faucet 12 passing through the opening of the packing 18. By combining them, the switching valve 11 is attached to the faucet 12.
[0011]
As shown in FIG. 7, a valve chamber 17c having a bottomed horizontal cylindrical shape is formed in the valve housing 17, and its right end is opened to the outside. The valve chamber 17c communicates with the introduction port 17a through a communication path 17d. As shown in FIG. 12, the first to third openings 17e, 17f, and 17g are arranged in the horizontal direction of the valve chamber 17c on the bottom surface of the valve chamber 17c (the top surface at the left end in FIGS. 1, 2, 7, and 8). It is formed at predetermined equal intervals (in this embodiment, three locations every 120 °) on the same circumference centered on the central axis that is directed. A first raw water passage 17h communicates with the first opening 17e. A second raw water passage 17i is communicated with the second opening 17f, and a third raw water passage 17j is communicated with the third opening 17g. A valve accommodating chamber 17k is formed in the middle of the first raw water passage 17h, and a hot water prevention valve 20 is accommodated in the valve accommodating chamber 17k. As shown in FIG. 2, the hot water prevention valve 20 includes a spool valve 21A housed in the valve housing chamber 17k, a shape memory alloy spring 21B that expands and contracts by detecting the temperature in the valve housing chamber 17k, and a biasing valve. It is comprised by the spring 21C. Similarly, a metering plug 23 for quantifying the flow rate of the raw water is attached to the tip of the valve housing chamber 17k via a metering plug holder 22. The first conduit 14 is connected to the metering plug 23 via a flange 24.
[0012]
As shown in FIGS. 2, 3 and 8, the valve housing 17 is formed with a purified water inlet 17l, and the purified water inlet 17l is connected to the second conduit 16 via a flange 25. . As shown in FIG. 3, the purified water introduction port 17l communicates with a purified water passage 17n to discharge purified water straight downward. The second raw water passage 17i guides the raw water downward and discharges it downward in the shower mode. The third raw water passage 17j guides raw water downward and discharges it downward in a straight mode.
[0013]
A disc-shaped valve seat 26 made of, for example, a rubber material such as EPDM (ethylene / propylene / gen / rubber) rubber is non-rotatably accommodated at a predetermined position on the bottom surface of the valve chamber 17c. As shown in FIG. 12, the valve seat 26 is formed with first to third valve holes 26a, 26b, and 26c so as to correspond to the first to third openings 17e, 17f, and 17g. . A seal ring portion 26d is formed on the periphery of the first to third valve holes 26a, 26b, and 26c. Annular engagement integrally formed around the first to third openings 17e, 17f, and 17g on the back surface (left side in FIGS. 1, 2, and 12) of the first to third valve holes 26a, 26b, and 26c. Engaging recesses 26e (see FIG. 1) for engaging the mating ridges 17o to 17o are formed. The valve seat 26 is prevented from rotating at the bottom of the valve chamber 17c.
[0014]
A disc-shaped valve element 27 is accommodated in the valve chamber 17 c so as to correspond to the valve seat 26. First and second ports 27a and 27b that can communicate with any one of the first to third valve holes 26a, 26b, and 26c are formed at equal intervals in the valve body 27 with an interval of 180 °. . A ring portion 27c is integrally formed on the outer peripheral surface of the valve body 27 so as to lightly contact the inner peripheral surface of the valve chamber 17c. The upstream surface (the right side in FIG. 12) of the valve body 27 is a pressure receiving surface 27d so as to receive the water pressure of the raw water introduced into the valve chamber 17c from the introduction port 17a. Then, the back surface of the valve body 27 is pressed against the seal ring portion 26d by this water pressure, and the contact surface between the seal ring portion 26d and the valve body 27 is sealed. Boss portions 27e are integrally formed at a plurality of locations on the pressure receiving surface 27d. By rotating this valve body 27, the raw water in the valve chamber 17c is supplied to any one of the first to third valve holes 26a, 26b, 26c of the valve seat 26.
[0015]
Next, the switching operation mechanism of the valve body 27 will be described.
As shown in FIGS. 1 and 2, a bearing 28 is fitted on the inner peripheral surface of the valve chamber 17 c, and a rotation operation shaft 31 is within a predetermined angular range in a bearing hole 28 a formed at the center of the bearing 28. Is supported so as to be reciprocally rotatable. A seal ring 29 is engaged with an annular engagement groove 28b formed on the outer peripheral surface of the bearing 28, and sealing is performed between the outer peripheral surface of the bearing 28 and the inner peripheral surface of the valve chamber 17c. . On the outer peripheral surface of the bearing 28, position restricting projections 28c are integrally formed projecting outward at a plurality of locations and engaged with engaging recesses formed on the inner peripheral surface of the valve chamber 17c. In the valve chamber 17c, the bearing 28 is prevented from rotating around its axis. A screw hole 28d is formed in the outer peripheral surface of the bearing 28. As shown in FIG. 2, a screw 30 is passed through the boss portion 17m of the valve housing 17 from the outer periphery and screwed into the screw hole 28d. 28 is fixed at a predetermined position in the valve chamber 17c.
[0016]
A shaft main body 31a of the rotation operation shaft 31 is formed in a horizontal cylindrical shape, and a flange portion 31b is integrally formed at a tip portion thereof. The flange 31b is integrally formed with an engagement pin 31c that is inserted into the engagement holes of the plurality of bosses 27e of the valve body 27 so as to be able to advance and retract. A spring holding portion 31 d is formed integrally and projecting toward the valve body 27 at the center portion of the flange portion 31 b. A spring B as a biasing member having a coil shape is supported on the outer peripheral surface of the spring holding portion 31d, and the tip of the spring B is held by a spring holding boss portion 27f formed integrally with the valve body 27. . With this spring B, the valve element 27 is always urged toward the valve seat 26 side.
[0017]
A seal ring 32 is interposed between the outer peripheral surface of the rotation operation shaft 31 and the inner peripheral surface of the bearing hole 28 a of the bearing 28. An operation knob 33 is fastened and fixed to the outer end portion of the rotation operation shaft 31 by screws 34. The screw 34 is screwed into the screw hole 31e of the rotation operation shaft 31 from the small hole 33a of the operation knob 33. An operation lever 33 b is integrally formed with the operation knob 33.
[0018]
Next, a mode holding mechanism capable of holding the operation knob 33 in any one of the three discharge modes described above by rotating the operation knob 33 will be described.
[0019]
On the outer surface (the right side surface in FIGS. 2 and 12) of the bearing 28, first to third engagement recesses 28 e, 28 f, 28 g are on the same circumference with the rotation axis of the rotation operation shaft 31 as the center. Are formed at a predetermined interval (60 ° in this embodiment). As shown in FIG. 2, a spring accommodating recess 33c is formed on the inner wall of the operation knob 33 so as to correspond to any one of the first to third engaging recesses 28e, 28f, and 28g. . The urging spring 36 accommodated in the spring accommodating recess 33c presses the engagement ball 35 against any one of the first to third engagement recesses 28e, 28f, 28g, and the valve body 27, the rotation operation shaft. 31 and the operation knob 33 are held in the selected discharge mode.
[0020]
As shown in FIG. 1, a boss portion 17p is integrally formed at the lower end portion of the valve housing 17, and a rectifying plate 40 is fitted into the inner peripheral surface of the boss portion 17p. As shown in FIG. 13, the rectifying plate 40 has a large number of rectifying holes 40a, and openings 40b and 40c are formed so as to communicate with the lower end openings of the third raw water passage 17j and the purified water passage 17n. A shower plate 41 is joined to the lower surface side of the rectifying plate 40 via a seal ring 42. As shown in FIGS. 1 and 11, the shower plate 41 is formed with a plurality of small holes 41a, and the raw water is discharged from the second raw water passage 17i into the shower state. A joint ring 43 is screwed into the male thread portion formed on the outer peripheral surface of the boss portion 17p, and the rectifying plate 40 and the shower plate 41 are fastened and fixed at predetermined positions.
[0021]
As shown in FIG. 13, the shower plate 41 is formed with a guide tube 41b for discharging purified water downward. The shower plate 41 is formed with a guide tube 41c for discharging raw water directly to the outside. As shown in FIG. 3, a strainer 44 is provided in the water purification guide tube 41b. The raw water guide tube 41c is provided with a drainer 45 and a strainer 46.
[0022]
As shown in FIGS. 1 and 4, the valve housing 17 is provided with a safety device 50 so as to correspond to the valve accommodating chamber 17k. The safety device 50 discharges the raw water in the valve storage chamber 17k to the outside when the pressure of the raw water in the valve storage chamber 17k exceeds a set value.
[0023]
Next, a characteristic configuration of the present invention will be described with reference to FIGS.
As shown in FIG. 4, the boss portion 17m is formed with a hole 17s for penetrating the screw 30, and the bearing 28 fitted in the inner peripheral surface 17r formed inside the boss portion 17m has the screw A screw hole 28 d for screwing 30 is formed. The bearing 28 is integrally formed with a pedestal 28h in which an insertion hole 28i for inserting the positioning pin 51 is formed. The tip portion of the pin 51 is formed in a substantially hemispherical shape, and the hemispherical portion 51a slightly protrudes from the opening end of the through hole 17t formed in the boss portion 17m, and this portion serves as a reference for the discharge mode. Function as. That is, the hemispherical portion 51a of the pin 51 is one of the three discharge mode display characters and figures (see the raw water straight, purified water straight, and raw water shower in FIG. 10) formed on the outer peripheral surface of the operation knob 33. It comes to correspond.
[0024]
As shown in FIG. 5, a slit 51b is cut out at the base end portion of the positioning pin 51, and a locking convex portion 51c having a gentle arc shape is integrally formed on the outer peripheral surface of the base end portion. Yes.
[0025]
As shown in FIGS. 4 and 5, the locking protrusion 51 c of the pin 51 is locked to a locking recess 28 j having a gentle arc shape formed on the inner peripheral surface of the insertion hole 28 i of the bearing 28. It has become. When the pin 51 is inserted into the insertion hole 28i from the through hole 17t, the locking projections 51c are elastically deformed so as to approach each other by the action of the slit 51b, and are engaged with the locking recesses 28j.
[0026]
Next, the operation of the switching valve 11 configured as described above will be described.
In FIG. 14A, the second port 27b of the valve element 27 corresponds to the second valve hole 26b of the valve seat 26, and the first port 27a is held between the first valve hole 26a and the third valve hole 26c. Indicates the state that has been performed. In this state, raw water flows from the valve chamber 17c through the second port 27b, the second valve hole 26b, the second opening 17f, and the second raw water passage 17i, and flows through the rectifying hole 40a of the rectifying plate 40 and the small hole 41a of the shower plate 41. It is discharged to the outside in the shower state.
[0027]
In the state shown in FIG. 14A, when the valve body 27 is rotated 60 degrees in the clockwise direction by the operation lever 33b of the operation knob 33, as shown in FIG. The 2 port 27b is separated from the second valve hole 26b, and the first port 27a communicates with the first valve hole 26a. Therefore, the raw water passes through the first port 27a, the first valve hole 26a, the first opening 17e, and the first raw water passage 17h. Thereafter, the water passes through the hot water prevention valve 20 and the metering plug 23 and is led from the flange 24 to the water purifier 15 by the first conduit 14. Therefore, the purified water changed from the raw water to the purified water is discharged to the outside through the purified water introduction port 17l, the purified water passage 17n, and the guide cylinder 41b. When the temperature in the valve accommodating chamber 17k becomes equal to or higher than a predetermined temperature, the shape memory alloy spring 21B is operated, the metering plug 23 is closed by the spool valve 21A, and the backflow of hot water is prevented.
[0028]
Further, in the state shown in FIG. 14B, when the valve body 27 is rotated by 60 ° in the clockwise direction by the rotation of the operation lever 33b of the operation knob 33, as shown in FIG. 14C. The first port 27a is separated from the first valve hole 26a, and the second port 27b is communicated with the third valve hole 26c. Therefore, the raw water in the valve chamber 17c is discharged straight through the second port 27b, the third valve hole 26c, the third opening 17g, the third raw water passage 17j, and the guide tube 41c.
[0029]
According to the switching valve of the above embodiment, the following characteristics can be obtained.
(1) In the above embodiment, the screw hole 28d is formed in the bearing 28 fitted into the inner peripheral surface 17r of the boss portion 17m, and the screw 30 is screwed into the screw hole 28d, so that the boss portion 17m The bearing 28 is tightened and fixed. Further, a base 28h having an insertion hole 28i is formed, and a positioning pin 51 is inserted and fixed in the insertion hole 28i. Furthermore, the function which fixes the boss | hub part 17m and the bearing 28 to this pin 51, and any one of three discharge modes (raw water straight, purified water straight, raw water shower) shown in FIG. A mark function as a reference for the discharge mode is added. For this reason, the assembly | attachment state of the bearing 28 assembled | attached to the boss | hub part 17m of the valve housing 17 can be ensured, and the external appearance of the outer peripheral surface of the boss | hub part 17m is not impaired. Moreover, two functions can be exhibited by one pin 51, the number of parts can be reduced, manufacturing and assembling operations can be easily performed, and cost can be reduced.
[0030]
(2) In the above embodiment, since the slit 51b and the locking projection 51c are formed in the base end portion of the positioning pin 51, the positioning pin 51 can be reliably inserted and locked at a predetermined position.
[0031]
(3) In the above embodiment, since the hemispherical portion 51a is formed at the tip of the positioning pin 51, the appearance as a mark can be improved, and the touch when the finger comes into contact is improved. Can do.
[0032]
(4) In the above embodiment, the first to third openings 17e, 17f, and 17g are formed in the valve chamber 17c of the valve housing 17. A valve seat 26 is joined to the bottom of the valve chamber 17 c, a valve body 27 is brought into contact with the valve seat 26, and the valve body 27 is rotated by a rotation operation shaft 31 and an operation knob 33. In addition, the pressure of the raw water introduced into the valve chamber 17c from the introduction port 17a acts on the valve chamber 17c, and the pressure presses the valve body 27 against the valve seat 26, and the valve seat 26 and the valve body 27 The contact interface was sealed. For this reason, the operating force for rotating the valve body 27 can be reduced, and the feeling of the switching operation of the three modes described above can be improved.
[0033]
(5) In the above embodiment, the seal ring portion 26d is formed integrally with the first to third valve holes 26a, 26b, and 26c of the valve seat 26 so that the back surface of the valve element 27 is in contact with the first to third valve holes 26a, 26b, and 26c. For this reason, compared with making the back surface of the valve body 27 contact the whole surface of the valve seat 26, the sealing performance around the first to third valve holes 26a, 26b, and 26c can be improved.
[0034]
(6) In the above embodiment, the spring B as the biasing member is interposed between the valve body 27 and the rotation operation shaft 31 so that the valve body 27 is pressed against the surface of the valve seat 26. For this reason, even when the water pressure is lowered, the valve body 27 can be properly brought into contact with the valve seat 26, and the sealing performance of the contact interface between the valve seat 26 and the valve body 27 can be improved.
[0035]
(7) In the above embodiment, the valve seat 26 is accommodated in the bottom surface of the valve chamber 17c, and the valve seat 26 is formed of rubber such as EPDM. Therefore, the valve seat 26 can be easily replaced when worn. it can. The seal ring portion 26d can be easily formed on the valve seat 26 by molding, and the manufacturing can be performed at a low cost.
[0036]
(8) In the above embodiment, the first to third valve holes 26a, 26b, 26c are formed in the valve seat 26, and the first and second ports 27a, 27b are 180 ° with respect to the valve body 27. Formed apart. For this reason, the operation of selectively switching among the raw water straight mode, the raw water shower mode, and the water purification straight mode can be performed by rotating the valve body 27 at a small angle (120 °), and the mode switching operation is easy. Can be done.
[0037]
In addition, you may change this embodiment as follows.
Only two first and second valve holes 26a and 26b may be formed for the valve seat 26. The first and second ports 27a and 27b of the valve body 27 may be single. Furthermore, the first to third valve holes 26a, 26b, 26c may be four or more.
[0038]
The valve seat 26 may be omitted and the back surface of the valve element 27 may be brought into contact with the first to third openings 17e, 17f, 17g.
O Instead of the water purifier 15, heating means such as a water heater or a heat storage device may be used.
[0039]
○ The engagement protrusion 17o formed around the valve seat 26 and the first to third openings 17e to 17g is omitted, and an annular groove is formed around the first to third openings 17e to 17g instead. The annular seal ring is engaged with the inside. You may make the back surface of the said valve body 27 contact this seal ring.
[0040]
Technical ideas other than the claims ascertained from the above-described embodiment will be described below.
(Technical idea 1) The raw water inlet, the valve chamber, and the valve chamber of the valve housing in which the raw water passages are formed are communicated with the plurality of raw water passages, respectively. A valve seat having a plurality of valve holes is provided, and a valve body having at least one port that can communicate with the valve hole is rotated with respect to the valve seat so that the position of the valve body can be switched. A pressure receiving surface for receiving the pressure of raw water is provided on the upstream surface, and a seal at the contact interface between the valve seat and the valve body is performed by the pressure of the raw water acting on the pressure receiving surface, and between the valve housing and the valve body. A switching operation mechanism for a valve body in a switching valve, comprising a rotation operation mechanism for performing a rotation operation of the valve body.
[0041]
(Technical idea 2) In the technical idea 1, the valve seat is provided with first to third valve holes, the valve body is provided with first and second ports, and the valve body is rotated. A switching operation mechanism for a valve body in a switching valve configured such that the first to third valve holes are selectively communicated with the first or second port by performing a dynamic operation.
[0042]
(Technical Thought 3) In the technical idea 1 or 2, the valve seat is formed of a member different from the valve housing constituting the valve chamber, and the valve body of the switching valve inserted in a predetermined position in the valve chamber. Switching operation mechanism.
[0043]
(Technical Thought 4) In any one of the technical thoughts 1 to 3, a seal ring portion that is in contact with the back surface opposite to the pressure receiving surface of the valve body is formed on the periphery of the valve hole of the valve seat. The switching operation mechanism of the valve body in the switching valve.
[0044]
(Technical Thought 5) In any one of the technical ideas 1 to 4, the valve body is a switching operation mechanism of the valve body in the switching valve in which the valve body is pressed against the valve seat by a biasing member with a predetermined biasing force.
[0045]
(Technical idea 6) In any one of the technical ideas 1 to 4, the rotation operation mechanism includes a bearing fitted and fixed to an opening of the valve chamber at a predetermined position of the valve housing; A pivoting operation shaft that is pierced and supported so as to be reciprocally rotatable at a predetermined position with respect to the bearing hole, and that the pivoting operation shaft is linked to the valve body so as to be able to rotate synchronously; The switching operation mechanism of the valve body in the switching valve comprised by the operation knob connected with the part.
[0046]
(Technical Thought 7) In any one of the technical thoughts 1 to 6, the introduction port introduces raw water from a faucet such as a water supply, and the plurality of raw water passages supply the raw water to the water purifier side. The switching operation mechanism of the valve body in the switching valve which is the 1st raw water passage which supplies to the 2nd raw water passage which discharges raw water with a shower, and the 3rd raw water passage which discharges raw water straight.
[0047]
(Technical Thought 8) In the technical idea 7, a switching operation mechanism of a valve body in a switching valve in which a hot water prevention valve and a metering plug are provided in the first raw water passage.
(Technical Thought 9) In the technical idea 8, in the first raw water passage, when the pressure in the passage becomes a predetermined value or more, the safety valve releases the pressure to the second raw water passage or the third raw water passage. The switching operation mechanism of the valve body in the switching valve provided with.
[0048]
(Definition)
In this specification, the raw water means a raw solution containing not only water discharged from a tap but also liquid discharged from a liquid supply source.
[0049]
【The invention's effect】
As described above in detail, the present invention has an advantage that the assembled state of the bearing assembled to the boss portion of the valve housing is ensured and the appearance of the outer peripheral surface of the boss portion is not impaired.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a central portion showing an embodiment of a switching valve of the present invention.
FIG. 2 is a cross-sectional plan view of a central portion of a switching valve.
FIG. 3 is a longitudinal sectional view of a switching valve.
FIG. 4 is a cross-sectional view showing the main part of the present invention.
FIG. 5 is an enlarged front view of a positioning pin.
FIG. 6 is an enlarged end view of a positioning pin.
FIG. 7 is a longitudinal sectional view of a central portion of the valve housing.
FIG. 8 is a sectional plan view of a central portion of the valve housing.
FIG. 9 is a cross-sectional view of a valve housing.
FIG. 10 is a perspective view showing a use state of the switching valve.
FIG. 11 is a bottom view of the switching valve.
FIG. 12 is an exploded perspective view showing the valve mechanism of the switching valve.
FIG. 13 is an exploded perspective view of a current plate, a shower plate, and a joint ring.
FIGS. 14A to 14C are explanatory views showing a switching operation of the switching valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Switching valve, 17 ... Valve housing, 17m ... Boss part, 17c ... Valve chamber, 17r ... Inner peripheral surface, 27 ... Valve body, 28 ... Bearing, 28i ... Insertion hole, 28j ... Locking recessed part, 34 ... Screw, 31 ... Rotating operation shaft, 51 ... Positioning pin, 51b ... Slit, 51c ... Locking convex part.

Claims (3)

A valve body for switching the flow path of raw water with respect to the valve chamber provided in the valve housing is rotated by a rotation operation shaft and accommodated so that the position can be switched. In a switching valve in which a bearing that supports the rotation operation shaft is fitted, and an operation knob is connected to an outer end portion of the rotation operation shaft,
A positioning screw is screwed into the bearing from the outer peripheral surface of the boss portion of the valve housing, and a positioning pin is inserted and fixed to the bearing, and the outer end of the positioning pin is connected to the outer peripheral surface of the operation knob. A switching operation mechanism for a valve body in a switching valve, which is provided with a mark function as a reference for a plurality of provided discharge modes. 2. The valve element switching operation mechanism according to claim 1, wherein the positioning pin has a spherical outer end. In Claim 1 or 2, a slit is formed in the base end portion of the positioning pin, and a locking projection is formed on the outer peripheral surface of the positioning pin corresponding to the slit. A switching operation mechanism for a valve body in a switching valve locked in a locking recess formed in an inner peripheral surface of an insertion hole of a bearing.

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