JP2019204186A - Pressure reducing valve - Google Patents

Abstract

To reduce a manufacturing cost and a size.SOLUTION: There are provided a casing 2, a pressure regulating shaft 3 having a valve body portion 41, a diaphragm 4 having a central portion fixed to the shaft 3 and an outer edge portion fixed to the casing 2, and a coil spring 5 for biasing the shaft 3 in a direction to separate the valve body portion 41 from a valve seat portion 14, and a spring retainer 6 attached to the shaft 3. The casing 2 includes a casing main body 11 and a lid 21 with which the spring 5 attached to one end 15 of the main body 11 can come into contact and which fixes an outer edge of the diaphragm 4 to the one end 15, and a lid 31 that is attached to the other end 17 of the main body 11 and that closes the other end 17 to restrict the detachment of the shaft 3. A mounting structure for attaching the lid 21 to the main body 11 (lock mechanism st1), a mounting structure for attaching the lid 21 to the main body 11 (lock mechanism st2), and a mounting structure of the retainer 6 to the shaft 3 (lock mechanism st3) are constituted by bayonet locking attachment mechanism.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a pressure reducing valve in which a diaphragm, a pressure adjusting shaft, a pressure adjusting spring, and a spring contact member are accommodated in a casing.

  For example, the following patent document discloses a pressure reducing valve (diaphragm type pressure reducing valve) attached to a water supply pipe of a warm water washing toilet seat device.

  This pressure reducing valve has a pressure adjusting diaphragm, a pressure adjusting shaft, and a pressure adjusting spring (hereinafter, simply referred to as “diaphragm”, “shaft”, and “spring”) incorporated in the valve case, and is disposed downstream. The water pressure can be regulated (depressurized) so that the water supply pressure with respect to the disposed stop valve is constant. In this pressure reducing valve, the above-mentioned valve case is composed of three parts: a body, a cover, and an output block. In this case, the body is provided with a primary port for introducing water to be decompressed, and the shaft is accommodated while being held by the holder. A threaded portion is formed at the upper end of the shaft, and a diaphragm retainer that holds the diaphragm in combination with the spring retainer is attached.

  A diaphragm is installed between the body and the cover. This diaphragm is sandwiched between the diaphragm retainer attached to the upper end of the shaft and the spring retainer as described above by screwing the spring retainer into the thread formed on the upper end of the shaft. It is fixed to the shaft. Further, a spring is accommodated in the cover so that the shaft can be biased via a spring retainer. Further, the output block is provided with a secondary side port for outputting depressurized water. In this case, in this pressure reducing valve, a spacer is disposed between the holder holding the shaft and the output block, thereby restricting the detachment of the shaft and the holder from the body.

Japanese Unexamined Patent Publication No. 2007-148465 (page 5-8, FIG. 1-2)

  However, the pressure reducing valve disclosed in the above patent document has the following problems to be solved. Specifically, in the pressure reducing valve disclosed in the above-mentioned patent document, a valve case (casing) that accommodates operating parts such as a shaft, a diaphragm, and a spring includes a body (casing body), a cover (first member), and an output block. It is composed of three parts (second member).

  In this case, there is no specific disclosure regarding the pressure reducing valve according to the embodiment of the invention disclosed in the patent document, but in this type of pressure reducing valve, the first member (cover) is the casing body (body). And the second member (output block) is screwed to the casing main body, whereby three parts are integrated (each member is attached to the casing main body by screwing). Mounting structure) is common. As an example, in a pressure reducing valve disclosed as background art in the patent document, a lid member (second member) is attached to a valve case (casing body) by an assembly bolt.

  For this reason, in the existing pressure reducing valve including the pressure reducing valve disclosed in the above-mentioned patent document, it is necessary to form a plurality of screw holes (female screws) for screwing screws (bolts) in the casing body. It has become difficult. Moreover, not only is it difficult to reduce the manufacturing cost due to the cost of parts of the screws (bolts), but it is also more difficult to reduce the manufacturing costs because it requires the work of turning a plurality of screws (bolts) during assembly. It has become.

  Further, in the pressure reducing valve disclosed in the above-mentioned patent document, the diaphragm is fixed to the shaft so as to be sandwiched between the diaphragm retainer and the spring retainer by screwing the spring retainer into the upper end portion of the shaft (screw fixing). Mounting structure to attach the spring retainer to the shaft). In this case, in the configuration in which the spring retainer is fixed to the shaft by screwing, it is necessary to form the shaft and the spring retainer (nut) from metal in order to avoid damage to the threaded portion. For this reason, in the pressure-reducing valve disclosed in the above-mentioned patent document, it is difficult to reduce the manufacturing cost due to the formation of the screw portion for the metal part.

  This invention is made | formed in view of this subject, and it aims at providing the pressure-reduction valve which can aim at reduction of manufacturing cost and size reduction.

  In order to achieve the above object, the pressure reducing valve according to claim 1 is a casing body provided with an inlet for introducing a liquid to be decompressed into a primary chamber and an outlet for discharging the decompressed liquid from the secondary chamber. And a pressure regulating shaft that is accommodated in the casing so as to be slidable with respect to the casing body, and is accommodated in the casing. And a diaphragm having a central portion fixed to one end portion of the pressure adjusting shaft and an outer edge portion fixed to the casing body, and being accommodated in the casing so as to separate the valve body portion from the valve seat portion. A pressure adjusting spring that urges the pressure adjusting shaft, and is attached to the one end of the pressure adjusting shaft so that the pressure adjusting spring can be brought into contact with the pressure adjusting spring. A pressure reducing valve having a spring contact member attached thereto, wherein the casing is attached to one end portion of the casing body so that the casing body and the pressure adjusting spring can come into contact with each other, and the casing body A first member that fixes the outer edge of the diaphragm to one end, and is attached to the other end of the casing body to close the other end and restricts the detachment of the pressure adjusting shaft from the casing body And a second member for attaching the first member to the casing body, a structure for attaching the second member to the casing body, and the spring contact member to the one end of the pressure adjusting shaft. At least one of these attachment structures is constituted by a bayonet lock attachment mechanism.

  The pressure reducing valve according to claim 2 is the pressure reducing valve according to claim 1, wherein the first member projects from the first member main body along a radial direction of the first member main body formed in a circular shape. The casing main body includes a plurality of first engaging claws, and the casing main body is formed in a cylindrical shape so that the first member can be inserted, and the first engaging claws are engaged. A plurality of possible first engaged portions are formed at the one end portion, and the bayonet locking attachment mechanism is configured by the first engaging claws and the first engaged portions. .

  According to a third aspect of the present invention, there is provided the pressure reducing valve according to the second aspect, wherein the first engaging claw portion is provided on one of the first engaging claw portion and the first engaged portion. And a first detachment restricting convex portion that engages with the other of the first engaged portions and restricts detachment of the first engaging claws from the first engaged portion. Is provided.

  The pressure reducing valve according to claim 4 is the pressure reducing valve according to any one of claims 1 to 3, wherein the second member is the second member along a radial direction of a second member main body formed in a circular shape. A plurality of second engaging claws protruding from the member main body, the casing main body having the other end formed in a cylindrical shape so that the second member can be inserted thereinto, and the second engagement. A plurality of second engaged portions capable of engaging the combination claw portions are formed at the other end portion, and the bayonet lock is formed by the second engaging claw portions and the second engaged portions. A type mounting mechanism is configured.

  The pressure reducing valve according to claim 5 is the pressure reducing valve according to claim 4, wherein the second engaging claw portion is provided on one of the second engaging claw portion and the second engaged portion. And a second detachment restricting convex portion that engages with the other of the second engaged portions and restricts detachment of the second engaging claws from the second engaged portions. Is provided.

  The pressure reducing valve according to claim 6 is the pressure reducing valve according to any one of claims 1 to 5, wherein the pressure adjusting shaft has the one end portion formed in a columnar shape and along the radial direction of the one end portion. A plurality of third engaging claws protruding from the one end, and the spring contact member is provided with an insertion hole through which the one end of the pressure adjusting shaft can be inserted, and the third A plurality of third engaged portions capable of engaging with the engaging claws are formed at the edge of the insertion hole, and each of the third engaging claws and each of the third engaged portions. The bayonet lock type attachment mechanism is constituted by the above.

  A pressure reducing valve according to a seventh aspect of the present invention is the pressure reducing valve according to the sixth aspect, wherein the third engaging claw portion is provided on one of the third engaging claw portion and the third engaged portion. And a third detachment restricting convex portion that engages with the other of the third engaged portions and restricts detachment of the third engaging claw portion from the third engaged portion. Is provided.

  The pressure reducing valve according to claim 8 is the pressure reducing valve according to any one of claims 1 to 7, wherein a space between the other end of the pressure regulating shaft and the second member is provided in the secondary chamber. A communication passage for communication is formed in the casing.

  According to the pressure reducing valve of claim 1, among the mounting structure of the first member to the casing body, the mounting structure of the second member to the casing body, and the mounting structure of the spring contact member to one end of the pressure adjusting shaft Because at least one of these is configured with a bayonet lock mounting mechanism, each mounting structure has a screw hole (screw) to which screws (bolts) are screwed, compared to a structure with a screw fixing (bolt fixing) structure or a nut fixing mounting structure. Since it is not necessary to form an insertion hole or the like for inserting a (female screw) or a screw (bolt) for tightening a nut, the pressure reducing valve can be reduced in size. Moreover, not only can the cost of components be reduced by the amount of screws (bolts) and nuts, but also the operation of screwing them becomes unnecessary, so that the manufacturing cost of the pressure reducing valve can be reduced.

  According to the pressure reducing valve according to claim 2, a plurality of first engaging claws provided on the first member main body of the first member so as to protrude along the radial direction, and one end of the casing main body Since the bayonet lock type attachment mechanism is constituted by the plurality of first engaged parts formed so that the first engaging claws can be engaged, it is necessary to attach the diaphragm and the pressure adjusting spring to the casing body to some extent. When the first member formed in the size is attached to the casing body with a screw-fastening (bolt-fastening) mounting structure or a nut-fastening mounting structure, multiple screws (bolts) or multiple nuts are required. On the other hand, by attaching the first member to the casing body by the bayonet lock type attachment mechanism, the pressure reducing valve can be sufficiently reduced in size, and the manufacturing cost of the pressure reducing valve is sufficient. It can be reduced.

  According to the pressure reducing valve of the third aspect, either the first engaging claw portion or the first engaged portion is connected to the other one of the first engaging claw portion and the first engaged portion. By providing a first detachment restricting projection that engages and restricts detachment of the first engaging claw from the first engaged portion, the first engaging claw is Even if the first member engaged with one engaged portion is not adhered or welded to the casing body, the first engaging claw portion from the first engaged portion Since the separation of the first member from the casing body can be preferably avoided, the manufacturing cost of the pressure reducing valve can be further reduced by the amount that does not require adhesion or welding.

  According to the pressure-reducing valve of claim 4, a plurality of second engaging claws provided on the second member main body of the second member so as to protrude in the radial direction, and the other end of the casing main body The bayonet lock type attachment mechanism is constituted by a plurality of second engaged portions formed so that the second engaging claws can be engaged with each other, so that the pressure regulating shaft is detached from the casing (casing body). When mounting the second member formed to a certain size to regulate the casing to the casing body with a screw-fastening (bolt-fastening) mounting structure or a nut-fastening mounting structure, a plurality of screws (bolts) or a plurality of screws Whereas a single nut is required, the second member is attached to the casing body by a bayonet lock attachment mechanism, so that the pressure reducing valve can be made sufficiently small and the manufacturing cost of the pressure reducing valve can be reduced. It can be sufficiently reduced.

  According to the pressure reducing valve of the fifth aspect, either the second engaging claw portion or the second engaged portion is connected to the other one of the second engaging claw portion and the second engaged portion. By providing the second disengagement restricting convex portion that engages and restricts the disengagement of the second engaging claw portion from the second engaged portion, the second engaging claw portion is The second engaging claw portion from the second engaged portion without bonding or welding the second member engaged with the two engaged portions to the casing body Since the separation of the second member from the casing body can be preferably avoided, the manufacturing cost of the pressure reducing valve can be further reduced by the amount that does not require adhesion or welding.

  According to the pressure reducing valve of the sixth aspect, the plurality of third engaging claws provided so as to protrude in the radial direction at one end portion of the pressure adjusting shaft, and the third engaging claw portion on the spring contact member. By configuring a bayonet lock type attachment mechanism with a plurality of third engaged parts formed so that the claws can be engaged, a nut stopper attachment structure is provided as a structure for attaching the spring contact member to the pressure adjusting shaft. When adopting, it is necessary to form a male screw at one end of the pressure adjusting shaft and prepare a nut separately from the spring contact member, or to form a female screw in the insertion hole of the spring contact member. On the other hand, by attaching the spring contact member to the pressure adjustment shaft by the bayonet lock type attachment mechanism, the pressure reducing valve is reduced to the extent that formation of a male screw and preparation of a nut or female screw is not required. It is possible to sufficiently reduce the manufacturing cost.

  According to the pressure reducing valve of the seventh aspect, either the third engaging claw portion or the third engaged portion is connected to the other one of the third engaging claw portion and the third engaged portion. By providing a third detachment restricting convex portion that engages and restricts detachment of the third engaging claw portion from the third engaged portion, the third engaging claw portion is Even if the spring contact member is not bonded or welded to the pressure regulating shaft engaged with the third engaged portion, the third engaging claw portion from the third engaged portion Since the separation, that is, the detachment of the spring contact member from the pressure adjusting shaft can be suitably avoided, the manufacturing cost of the pressure reducing valve can be further reduced by the amount that does not require adhesion or welding.

  According to the pressure reducing valve of the eighth aspect, the communication passage that communicates the space between the other end portion of the pressure regulating shaft and the second member to the secondary chamber is formed in the casing. Compared with the formation of the communication passage, the cost required for manufacturing the pressure regulating shaft can be sufficiently reduced. As a result, the manufacturing cost of the pressure reducing valve can be further reduced.

1 is an external perspective view of a pressure reducing valve 1. FIG. 4 is another external perspective view of the pressure reducing valve 1. FIG. 2 is an exploded perspective view of the pressure reducing valve 1. FIG. 1 is a cross-sectional view of a pressure reducing valve 1. FIG. 3 is an external perspective view showing an attachment structure (lock mechanism st1) of the lid body 21 to the casing body 11. FIG. 3 is an external perspective view showing an attachment structure (lock mechanism st2) of the lid body 31 to the casing body 11. It is an external appearance perspective view of the cover body 31 single-piece | unit. 2 is an external perspective view of a pressure adjusting shaft 3 and a spring retainer 6. FIG. FIG. 3 is an external perspective view showing a structure for attaching a spring retainer 6 to a pressure adjusting shaft 3 (lock mechanism st3).

  Hereinafter, embodiments of a pressure reducing valve according to the present invention will be described with reference to the accompanying drawings.

  First, the configuration of the pressure reducing valve 1 will be described with reference to the accompanying drawings.

  The pressure reducing valve 1 shown in FIGS. 1 to 4 is an example of a “pressure reducing valve”, and is attached to a water supply facility or the like to supply tap water (an example of “liquid to be decompressed”: hereinafter simply referred to as “water”). The water pressure is adjusted to a predetermined pressure (depressurized) and output. The pressure reducing valve 1 includes a casing 2, a pressure regulating shaft 3, a diaphragm 4, a coil spring 5, a spring retainer 6, and O-rings 7a and 7b.

  The casing 2 is an example of a “casing”, and in the pressure reducing valve 1 of the present example, the casing 2 is configured by three members of the casing body 11 and the lid bodies 21 and 31. The casing body 11 is an example of a “casing body”, and the inlet 12 for introducing the liquid to be decompressed into the primary chamber S1 (see FIG. 4), and the decompressed liquid in the secondary chamber S2 (see FIG. 4). ) Is provided. As shown in FIGS. 3 and 4, a valve seat portion 14 that can contact a valve body portion 41 of the pressure adjusting shaft 3 described later is provided in the flow path from the inlet 12 to the outlet 13. Yes.

  In this case, in the pressure reducing valve 1 (casing 2) of this example, as shown in FIG. 5, one end 15 of the casing main body 11 (an example of “one end of the casing main body”) is cylindrical so that the lid 21 can be inserted. The pair of engaged portions 16 (of the “first engaged portion”) can be engaged with a pair of engaging claws 24 formed on the lid 21 as described later. An example) is formed. Further, in the casing main body 11 of this example, the separation restricting convex portion 16a (which engages with the engaging claw portion 24 of the lid 21 and restricts the disengagement of the engaging claw portion 24 from the engaged portion 16). An example of “first separation regulating convex portion” is provided in the engaged portion 16 (“one of the first engaging claw portion and the first engaged portion” is “first”. Example of a configuration that is “an engaged portion”).

  Furthermore, in the pressure reducing valve 1 (casing 2) of this example, as shown in FIG. 6, the other end 17 of the casing main body 11 (an example of the “other end of the casing main body”) can be fitted with the lid 31. A pair of engaged portions 18 (“second engaged portions”) that are formed in a cylindrical shape and that can engage with a pair of engaging claws 33 formed on the lid 31 as described later. Example) is formed. Further, in the casing body 11 of the present example, the separation restricting convex portion 18 a (which engages with the engaging claw portion 33 of the lid 31 and restricts the disengagement of the engaging claw portion 33 from the engaged portion 18). An example of “a second detachment restricting convex portion” is provided on the engaged portion 18 (“one of the second engaging claw portion and the second engaged portion” is “second”. Example of a configuration that is “an engaged portion”).

  The lid body 21 is an example of a “first member”, and is attached to the one end portion 15 of the casing body 11 as described above. In this case, in the pressure reducing valve 1 (casing 2) of this example, the lid body 21 is constituted by two members, that is, a diaphragm presser 22 and a spring presser 23, as shown in FIG. As shown in FIG. 4, the diaphragm retainer 22 is a member mainly for fixing the outer edge portion of the diaphragm 4 to the one end portion 15 of the casing body 11, and is formed in a cylindrical shape as a whole as shown in FIG. ing. As shown in FIG. 4, the diaphragm retainer 22 is formed with a female screw at the end on the side where the spring retainer 23 is attached, and at the opposite end as shown in FIG. A pair of engaging claws 24 (an example of “first engaging claws”) protruding in the direction is formed. Further, the engaging claw portions 24 are respectively formed with engaging concave portions 24a to which the above-described detachment regulating convex portions 16a in the casing body 11 can be engaged.

  The spring retainer 23 is attached to the diaphragm retainer 22 so that the coil spring 5 can come into contact with the spring retainer 23, and is rotated with respect to the diaphragm retainer 22 when adjusting the urging force of the pressure regulating shaft 3 by the coil spring 5. In the lid body 21 of the present example, the “first member body formed in a circular shape” is configured by the portion of the diaphragm retainer 22 excluding the engaging claw 24 and the spring retainer 23.

  The lid 31 is an example of a “second member”, and closes an insertion port (an opening on the other end 17 side of the casing body 11) such as the pressure adjusting shaft 3 in the casing body 11, and also the casing body. 11 is attached to the other end portion 17 of the casing body 11 so as to be able to regulate the detachment of the pressure adjusting shaft 3 from the casing 11. As shown in FIGS. 4, 6, and 7, the lid 31 is provided with a shaft guide portion 32 that slidably holds the pressure adjusting shaft 3, and is formed in a cylindrical shape as a whole as shown in FIG. 7. ing.

  In addition, as shown in FIGS. 6 and 7, the lid 31 is formed with a pair of engaging claws 33 (an example of “second engaging claws”) protruding outward in the radial direction. . Further, the engaging claw 33 is formed with an engaging recess 33a to which the above-described detachment restricting protrusion 18a in the casing body 11 can be engaged. In the lid body 31 of this example, a “second member main body formed in a circular shape” is configured by a portion excluding the engaging claw portion 33. As shown in FIG. 7, the shaft guide portion 32 of the lid 31 includes a space S <b> 2 a formed in the shaft guide portion 32 by the lid 31 and the pressure adjusting shaft 3, and the shaft guide portion, as will be described later. A hole 34 for communicating with the outer space 32 (secondary chamber S2) is formed.

  The pressure adjusting shaft 3 is an example of a “pressure adjusting shaft”. As shown in FIG. 8, a valve body 41 capable of contacting the valve seat portion 14 of the casing body 11 is provided, and the pressure adjusting shaft 3 is shown in FIG. 4. As described above, the casing 2 is slidably accommodated in the casing 2. As shown in FIG. 8, the pressure adjusting shaft 3 has one end portion 42 (an example of “one end portion of the pressure adjusting shaft”) formed in a columnar shape, and one end portion 42 along the radial direction of the one end portion 42. Three engaging claws 43 (an example of “third engaging claws”) that protrude outward from the outer wall are provided.

  As shown in FIGS. 4 and 6, the pressure adjusting shaft 3 (the other end 44) is in close contact with the casing 2 (the lid body 31) at the other end 44 of the pressure adjusting shaft 3. A plurality of protrusions 44a are formed to prevent the slide of the pressure adjusting shaft 3 from being hindered. Further, as shown in FIG. 4, the other end portion 44 of the pressure adjusting shaft 3 is formed in a columnar shape whose outer diameter is slightly smaller than the inner diameter of the shaft guide portion 32 in the lid 31, and pressure adjustment A groove 44b (see FIG. 8) into which an O-ring 7a for closing a gap between the shaft 3 and the shaft guide portion 32 can be inserted is formed.

  The diaphragm 4 is an example of a “diaphragm”, and as shown in FIG. 4, the diaphragm 4 is accommodated in the casing 2, the central portion is fixed to one end portion 42 of the pressure adjusting shaft 3, and the outer edge portion is the casing body 11 and The casing body 11 is fixed to one end 15 of the casing body 11 so as to be sandwiched between the lid bodies 21 (diaphragm holders 22). An insertion hole 4 a into which the one end 42 of the pressure adjusting shaft 3 can be inserted is formed at the center of the diaphragm 4. The coil spring 5 is an example of a “pressure adjusting spring”, and, as shown in FIG. 4, biases the pressure adjusting shaft 3 in a direction in which the valve body portion 41 is separated from the valve seat portion 14 (downward in the drawing). It is accommodated in the casing 2 as possible.

  The spring retainer 6 is an example of a “spring contact member”. As shown in FIG. 4, the spring retainer 6 is accommodated in the casing 2 and attached to one end portion 42 of the pressure adjusting shaft 3 so that the coil spring 5 can come into contact therewith. ing. As shown in FIG. 8, the spring retainer 6 is provided with an insertion hole 51 through which one end portion 42 of the pressure adjusting shaft 3 can be inserted, and the engagement claw portions 43 of the pressure adjusting shaft 3 can be engaged. Three engaged portions 52 (an example of a “third engaged portion”) are formed at the edge of the insertion hole 51. In this case, in the spring retainer 6 of this example, the detachment regulation that engages with each of the engaging claw portions 43 of the pressure adjusting shaft 3 and restricts the detachment of each engaging claw portion 43 from each engaged portion 52. Convex portions 52a (an example of a “third separation regulating convex portion”) are provided in each engaged portion 52 (any of “third engaging claw portion and third engaged portion”). Example of a configuration in which “one” is “third engaged portion”).

  As described above, the O-ring 7a is attached to the groove 44b in the other end portion 44 of the pressure adjusting shaft 3, and closes the gap between the other end portion 44 of the pressure adjusting shaft 3 and the shaft guide portion 32 of the lid 31. To do. As shown in FIG. 4, the O-ring 7 b is attached to the casing 2 so as to be sandwiched between the other end 17 of the casing body 11 and the shaft guide portion 32 of the lid body 31. The gap between the body 31 is closed.

  In this case, in the pressure reducing valve 1 of this example, as shown in FIGS. 4 and 5, the lid body 21 is attached to the casing body 11 by the engaging claw portions 24 of the lid body 21 and the engaged portions 16 of the casing body 11. A lock mechanism st1 that is an example of a “bayonet lock-type attachment mechanism” for attaching a bay is configured (an example in which “a structure for attaching the first member to the casing body” is constituted by a “bayonet lock-type attachment mechanism”. ).

  Moreover, in the pressure reducing valve 1 of this example, as shown in FIGS. 4 and 6, the lid body 31 is attached to the casing body 11 by the engaging claw portions 33 of the lid body 31 and the engaged portions 18 of the casing body 11. A lock mechanism st2 that is an example of a “bayonet lock type mounting mechanism” for mounting is configured (an example in which “a second member mounting structure with respect to the casing body” is configured as a “bayonet lock type mounting mechanism”). .

  Furthermore, in the pressure reducing valve 1 of this example, as shown in FIGS. 4, 8, and 9, the engaging claw portions 43 of the pressure adjusting shaft 3 and the engaged portions 52 of the spring retainer 6 are used to adjust the pressure adjusting shaft 3. A lock mechanism st3, which is an example of a “bayonet lock-type attachment mechanism” for attaching the spring retainer 6 to the one end portion 42, is configured (“the attachment structure of the spring contact member to one end portion of the pressure adjusting shaft” is “bayonet”. Example of “Lock-type mounting mechanism”).

  Further, in the pressure reducing valve 1 of this example, as shown in FIG. 4, a space S2a is provided between the lid body 31 of the casing 2 and the other end portion 44 of the pressure regulating shaft 3, and this space S2a is divided into two. A communication path L (an example of “communication path”) communicating with the next chamber S <b> 2 is formed in the casing 2. Specifically, in the pressure reducing valve 1 of the present example, as described above, the hole 34 is formed in the shaft guide portion 32 of the lid body 31, whereby the lid body 31 (shaft guide portion 32) and the pressure regulating valve are formed. A communication path L is formed that communicates the space S2a formed by the shaft 3 (the other end portion 44) and the secondary chamber S2 that is the outer space of the shaft guide portion 32.

  In the pressure reducing valve 1 of this example, as an example, each component other than the coil spring 5 and the O-rings 7a and 7b is injection-molded using a resin material such as PPS (Poly Pphenylene Sulfide) or POM (Polyacetal) as a molding material. It is formed in the shape as described above by processing. Therefore, compared to manufacturing the above-described components by, for example, cutting a metal material, each component having a somewhat complicated shape can be easily manufactured in a short time. It is possible to reduce it. In addition, the weight of the pressure reducing valve 1 as a whole can be sufficiently reduced as compared with the case where metal components are employed.

  Next, a method for manufacturing the pressure reducing valve 1 will be described with reference to the accompanying drawings.

  When manufacturing the pressure reducing valve 1, first, the casing body 11 and the lid bodies 21 and 31 of the casing 2, the pressure regulating shaft 3, the diaphragm 4, and the spring retainer 6 are respectively manufactured by injection molding. Next, the O-ring 7 a is fitted into the groove 44 b of the pressure adjusting shaft 3, and the O-ring 7 b is attached to the outside of the shaft guide portion 32 in the lid 31. Subsequently, the other end portion 44 of the pressure adjusting shaft 3 is inserted into the shaft guide portion 32 of the lid 31 so that the pressure regulating shaft 3 is held by the lid 31. Next, the lid body 31 is inserted into the casing body 11 by inserting the one end portion 42 of the pressure adjusting shaft 3 held by the lid body 31 (shaft guide portion 32) into the casing body 11 from the other end portion 17 side. It is attached to the other end portion 17.

  Specifically, first, the lid body 31 is inserted into the other end portion 17 of the casing body 11 so that the engaging claw portion 33 of the lid body 31 is positioned on the side of the engaged portion 18 of the casing body 11. Next, the engaging claw portion 33 is engaged with the engaged portion 18 by rotating the lid body 31 relative to the casing body 11. At this time, the detachment restricting convex portion 18 a formed on the engaged portion 18 of the casing body 11 is engaged with the engaging concave portion 33 a formed on the engaging claw portion 33 of the lid 31. The detachment of the engaging claw 33 from the engaged portion 18 (relative rotation of the lid 31 with respect to the casing body 11) is regulated. Thereby, the attachment of the lid 31 to the casing body 11 by the lock mechanism st2 and the accommodation of the pressure regulating shaft 3 in the casing 2 (the casing body 11 and the lid 31) are completed.

  Next, the spring retainer 6 is attached to the diaphragm 4 while fixing the diaphragm 4 to the pressure adjusting shaft 3. Specifically, first, the diaphragm 4 is caused to enter the casing body 11 from the one end 15 side of the casing body 11, and the one end 42 of the pressure adjusting shaft 3 protruding from the valve seat portion 14 of the casing body 11 is changed. The diaphragm 4 is inserted through the insertion hole 4a. Next, the spring retainer 6 is caused to enter the casing body 11 from the one end 15 side of the casing body 11, and the one end 42 of the pressure adjusting shaft 3 is inserted into the insertion hole 51 of the spring retainer 6.

  At this time, the engaging claw portion 43 of the pressure adjusting shaft 3 is located on the side of the engaged portion 52 provided at the opening edge portion of the insertion hole 51. Therefore, the engaging claw portion 43 is engaged with the engaged portion 52 by rotating the spring retainer 6 relative to the pressure adjusting shaft 3. At this time, the disengagement restricting convex portion 52 a formed on the engaged portion 52 of the spring retainer 6 is engaged with the engaging claw portion 43 of the pressure adjusting shaft 3, so that from the engaged portion 52 The engagement claw 43 is disengaged (relative rotation of the spring retainer 6 with respect to the pressure adjusting shaft 3). This completes the attachment of the spring retainer 6 to the pressure regulating shaft 3 by the lock mechanism st3, and the central portion of the spring retainer 6 is fixed to the one end portion 42 of the pressure regulating shaft 3 so that the casing 2 (the casing body 11) is fixed. The housing of the diaphragm 4 and the spring retainer 6 is completed.

  Subsequently, the lid 21 is attached to the casing body 11 and the coil spring 5 is accommodated in the casing 2. In this case, there are several procedures for attaching the lid 21 and accommodating the coil spring 5. As an example, first, the lid 21 is assembled by screwing the spring retainer 23 into the diaphragm retainer 22, and the spring retainer 6. A lid 21 is attached to one end 15 of the casing body 11 with the coil spring 5 placed thereon.

  In this case, when the lid body 21 is attached to the casing body 11, first, the casing body so that the engaging claw portion 24 of the diaphragm presser 22 in the lid body 21 is positioned to the side of the engaged portion 16 of the casing body 11. A diaphragm holder 22 is inserted into one end portion 15 of 11. At this time, since the coil spring 5 on the spring retainer 6 contacts the inner surface of the spring retainer 23, the lid 21 is inserted into the one end portion 15 of the casing body 11 so as to compress and shrink the coil spring 5.

  Next, the engaging claw portion 24 of the diaphragm presser 22 is engaged with the engaged portion 16 by rotating the lid body 21 relative to the casing body 11. At this time, the outer edge portion of the diaphragm 4 is sandwiched between the one end portion 15 of the casing body 11 and the lower end portion of the lid body 21 (diaphragm retainer 22). Fixing of the diaphragm 4 to the one end 15) is completed. Further, a state in which the detachment restricting convex portion 16a formed on the engaged portion 16 of the casing body 11 is engaged with the engaging concave portion 24a formed on the engaging claw portion 24 of the diaphragm presser 22 in the lid 21. Thus, the disengagement of the engaging claw portion 24 from the engaged portion 16 (relative rotation of the diaphragm presser 22 with respect to the casing body 11) is regulated.

  Thus, the lid 21 is attached to the casing body 11 by the lock mechanism st1, the outer edge of the diaphragm 4 is fixed to the casing body 11, and the coil spring 5 is accommodated in the casing 2 (the casing body 11 and the diaphragm retainer 22). Is completed. As described above, in the pressure reducing valve 1 of the present example, each member is attached to the casing body 11 without performing screwing (bolt fastening) fixing, adhesive fixing, welding fixing, or the like, and the assembly work is completed. Thereafter, if necessary, the spring retainer 23 is screwed or loosened with respect to the diaphragm retainer 22, and the length of the coil spring 5 in the casing 2, that is, the spring retainer 6 by the coil spring 5 is interposed. By adjusting the urging force of the pressure regulating shaft 3, the pressure reducing valve 1 is completed as shown in FIGS.

  In the pressure reducing valve 1, water to be pressure-reduced is introduced from the upstream water supply pipe in a state where a water supply pipe (not shown) is connected to the inlet 12 and the outlet 13 of the casing 2 (casing body 11). By being introduced into the primary chamber S1 through the port 12, the water reduced to a pressure corresponding to the length (biasing force) of the coil spring 5 adjusted by screwing the spring retainer 23 with respect to the diaphragm retainer 22 is 2 It is discharged from the next chamber S2 through the discharge port 13 to the downstream water supply pipe.

  Specifically, in the pressure reducing valve 1 assembled as described above, the coil spring 5 housed in the casing 2 causes the pressure regulating shaft 3 to spring in a direction from its one end 42 toward the other end 44. It is urged through the retainer 6. Accordingly, in a normal state, a gap is generated between the valve body portion 41 of the pressure adjusting shaft 3 and the valve seat portion 14 of the casing 2 (casing body 11).

  On the other hand, when water to be depressurized is introduced through the upstream water supply pipe, the water passes from the primary chamber S1 to the secondary chamber S2 through the gap between the valve body portion 41 and the valve seat portion 14. Inflow. As a result, the water pressure in the secondary chamber S2 rises, the diaphragm 4 is elastically deformed, and the spring retainer 6 is moved in the direction opposite to the extending direction of the coil spring 5. As a result, the pressure regulating shaft 3 is slid in the direction from the other end portion 44 toward the one end portion 42, and the gap between the valve body portion 41 and the valve seat portion 14 is narrowed (or the valve body portion 41 is The amount of water flowing from the primary chamber S1 to the secondary chamber S2 decreases. For this reason, as a result of the water being discharged from the discharge port 13 to the downstream water supply pipe, the water pressure in the secondary chamber S2 is reduced, the water discharged from the pressure reducing valve 1 is suitably decompressed. .

  Further, when the water pressure in the secondary chamber S2 decreases, the diaphragm 4 is elastically deformed in the reverse direction by the biasing force of the coil spring 5, and the pressure regulating shaft 3 is directed from the one end portion 42 toward the other end portion 44. It is slid with respect to the casing body 11. As a result, the gap between the valve body portion 41 and the valve seat portion 14 is increased and water flows into the secondary chamber S2 from the primary chamber S1 to increase the water pressure in the secondary chamber S2. Then, the diaphragm 4 is elastically deformed and the pressure adjusting shaft 3 is slid in the direction from the other end 44 toward the one end 42, and the gap between the valve body 41 and the valve seat 14 is narrowed (or The valve body portion 41 comes into contact with the valve seat portion 14 and there is no gap), and the amount of water flowing from the primary chamber S1 to the secondary chamber S2 decreases.

  Thus, in the pressure reducing valve 1 of this example, the pressure regulating shaft 3 slides with respect to the casing 2 (casing body 11) in conjunction with the increase / decrease of the water pressure in the secondary chamber S2, whereby the pressure regulating shaft. The amount of water flowing into the secondary chamber S2 from the primary chamber S1 through the gap between the valve body portion 3 of the No. 3 and the valve seat portion 14 of the casing 2 (casing body 11) changes in small increments. As a result, the water introduced from the inlet 12 is discharged from the outlet 13 to the downstream water supply pipe in a state where the water pressure is reduced.

  In the pressure reducing valve 1, as shown in FIG. 4, an O-ring 7 a is disposed between the shaft guide portion 32 in the lid body 31 of the casing 2 and the pressure regulating shaft 3 held by the shaft guide portion 32. Has been. The O-ring 7a communicates with the primary chamber S1 and the secondary chamber S2 (via the communication path L to the secondary chamber S2) while allowing the pressure adjusting shaft 3 to slide relative to the lid 31 (shaft guide portion 32). It is a member for partitioning the space S2a) and preventing high-pressure water from flowing from the primary chamber S1 into the secondary chamber S2 (space S2a).

  Therefore, unlike the pressure reducing valve 1 of this example, when the hole 34 is not provided in the shaft guide portion 32 of the lid 31, the inner bottom portion of the shaft guide portion 32 and the other end portion 44 of the pressure regulating shaft 3 The space S2a is sealed by the O-ring 7a. In such a configuration, when a force is applied to slide the pressure adjusting shaft 3 with respect to the lid body 31 (shaft guide portion 32) in the direction from the other end portion 44 toward the one end portion 42, the primary chamber S1. In addition, since water or the like does not flow into the space S2a from the secondary chamber S2, the slide of the pressure adjusting shaft 3 is hindered. Even when a force is applied to slide the pressure adjusting shaft 3 from the one end portion 42 toward the other end portion 44 with respect to the lid 31 (shaft guide portion 32), water in the space S2a, etc. Is not discharged into the primary chamber S1 or the secondary chamber S2, and the sliding of the pressure adjusting shaft 3 is hindered.

  On the other hand, in the pressure reducing valve 1 of the present example, a hole 34 is formed in the shaft guide portion 32 of the lid 31 to form a communication path L that communicates the secondary chamber S2 and the space S2a. Therefore, in the pressure reducing valve 1 of this example, when a force is applied to slide the pressure regulating shaft 3 relative to the lid 31 (shaft guide portion 32) in a direction from the other end portion 44 toward the one end portion 42. Since the water in the secondary chamber S2 flows into the space S2a through the communication path L and the inside of the space S2a has the same water pressure as that in the secondary chamber S2, the pressure adjusting shaft 3 can be smoothly slid. It becomes. In addition, when a force is applied to slide the pressure adjusting shaft 3 from the one end portion 42 toward the other end portion 44 with respect to the lid body 31 (shaft guide portion 32), the communication shaft L is also connected. Since the water in the space S2a flows out into the secondary chamber S2, and the inside of the space S2a has the same water pressure as in the secondary chamber S2, the pressure adjusting shaft 3 is slid smoothly.

  In this case, instead of the configuration in which the communication path L for communicating the secondary chamber S2 and the space S2a is provided in the casing 2 as in the pressure reducing valve 1 of this example, for example, the longitudinal direction of the “pressure regulating shaft” By providing a long “hole” along the line, it is also possible to form a “communication path” that connects the space corresponding to the secondary chamber S2 in the pressure reducing valve 1 and the space corresponding to the space S2a. However, when the “pressure adjusting shaft” is formed of a resin material, it is necessary to add a structure for forming the above “hole” to a small mold for forming a relatively small “pressure adjusting shaft”. As a result, the cost of molds soars and the cost of parts soars. In addition, when the “pressure adjusting shaft” is formed of a metal material, the cutting cost for forming the above “hole” is performed on the small “pressure adjusting shaft”, so that the cost of parts increases. . On the other hand, in the pressure reducing valve 1 of this example, since the hole 34 is formed in the casing 2 (lid body 31) larger than the pressure regulating shaft 3 and the communication path L is formed, the mold for resin molding The hole 34 can be easily cut when the lid 31 is made of metal.

  Thus, according to the pressure reducing valve 1, the attachment structure of the lid body 21 to the casing body 11, the attachment structure of the lid body 31 to the casing body 11, and the attachment structure of the spring retainer 6 to the one end portion 42 of the pressure regulating shaft 3. At least one of them (all three in the pressure reducing valve 1 of this example) is constituted by the lock mechanisms st1 to st3 of the bayonet lock type mounting mechanism, so that each mounting structure is screwed (bolted) mounting structure or Compared to the structure with a nut fixing mounting structure, it is not necessary to form a screw hole (female screw) for screwing a screw (bolt) or an insertion hole for inserting a screw (bolt) for tightening the nut. 1 can be miniaturized. Moreover, not only can the cost of parts be reduced by the amount of screws (bolts) and nuts, but also the operation of screwing them becomes unnecessary, so that the manufacturing cost of the pressure reducing valve 1 can be reduced.

  Further, according to the pressure reducing valve 1, a plurality of engagement members provided so as to protrude along the radial direction on the “first lid body (in this example, the diaphragm presser 22 and the spring presser 23)” of the lid 21. By configuring the locking mechanism st1 of the bayonet locking attachment mechanism by the combination claw portion 24 and the plurality of engaged portions 16 formed so that the engagement claw portion 24 can be engaged with the one end portion 15 of the casing body 11. When the lid body 21 formed to a certain size for attaching the diaphragm 4 and the coil spring 5 to the casing body 11 is attached to the casing body 11 with a screwing (bolt fastening) mounting structure or a nut fastening mounting structure. Whereas a plurality of screws (bolts) or a plurality of nuts are required, the locking mechanism st1 of the bayonet locking attachment mechanism is used. By fitted with a lid 21 to the casing body 11, a pressure reducing valve 1 can be miniaturized sufficiently, and the manufacturing cost of the pressure reducing valve 1 can be sufficiently reduced.

  Furthermore, according to the pressure reducing valve 1, the engagement claw portion 24 and the engaged portion 16 are connected to either the engagement claw portion 24 or the engaged portion 16 (the engaged portion 16 in this example). On the other side (in this example, the engagement concave portion 24a of the engagement claw portion 24) is provided, and a separation regulating convex portion 16a that regulates the separation of the engagement claw portion 24 from the engaged portion 16 is provided. Thus, the engagement from the engaged portion 16 can be achieved without bonding or welding the lid 21 in a state where the engaging claw portion 24 is engaged with the engaged portion 16 to the casing body 11. Since it is possible to preferably avoid the separation of the joint claw 24, that is, the detachment of the lid 21 from the casing body 11, the manufacturing cost of the pressure reducing valve 1 can be further reduced by the amount that does not require adhesion or welding. Can do.

  Further, according to the pressure reducing valve 1, the plurality of engaging claws 33 provided to protrude along the radial direction on the “second member main body (shaft guide portion 32 in this example)” of the lid 31. And the locking mechanism st2 of the bayonet locking attachment mechanism is configured by the plurality of engaged portions 18 formed so that the engaging claw portions 33 can be engaged with the other end portion 17 of the casing body 11. A lid 31 formed to a certain size in order to restrict detachment of the pressure adjusting shaft 3 from the (casing main body 11) is attached to the casing main body 11 with a screwing (bolt) mounting structure or a nut fixing mounting structure. In this case, a plurality of screws (bolts) or a plurality of nuts are required, whereas the lid 31 is attached to the casing by the lock mechanism st2 of the bayonet lock type attachment mechanism. By attached to 11, it can be sufficiently miniaturized vacuum valve 1, and the manufacturing cost of the pressure reducing valve 1 can be sufficiently reduced.

  Furthermore, according to the pressure reducing valve 1, the engagement claw 33 and the engaged portion 18 are connected to either the engagement claw portion 33 or the engaged portion 18 (in this example, the engaged portion 18). On the other side (in this example, the engagement concave portion 33a of the engagement claw portion 33) is provided with a separation regulating convex portion 18a that regulates the separation of the engagement claw portion 33 from the engaged portion 18. Thus, the engagement from the engaged portion 18 can be achieved without bonding or welding the lid 31 in a state where the engaging claw portion 33 is engaged with the engaged portion 18 to the casing body 11. Since it is possible to favorably avoid the separation of the claw portion 33, that is, the detachment of the lid 31 from the casing body 11, the manufacturing cost of the pressure reducing valve 1 is further reduced by the amount that does not require adhesion or welding. Can do.

  Further, according to the pressure reducing valve 1, the engagement claw portions 43 provided on the one end portion 42 of the pressure adjusting shaft 3 so as to protrude in the radial direction and the engagement claw portions 43 on the spring retainer 6 are engaged. Since the lock mechanism st3 of the bayonet lock type attachment mechanism is configured by the plurality of engaged portions 52 formed so as to be capable of being connected, a nut-fixing attachment structure is adopted as the attachment structure of the spring retainer 6 to the pressure regulating shaft 3. In this case, it is necessary to form a male screw at one end 42 of the pressure adjusting shaft 3 and prepare a nut separately from the spring retainer 6 or form a female screw at the insertion hole 51 of the spring retainer 6. On the other hand, by attaching the spring retainer 6 to the pressure adjusting shaft 3 by the lock mechanism st3 of the bayonet lock type attachment mechanism, And by the amount of formation of the prepared and the female screw of the nut is not required, it is possible to sufficiently reduce the manufacturing cost of the pressure reducing valve 1.

  Furthermore, according to the pressure reducing valve 1, the engaging claw 43 and the engaged portion 52 are connected to either the engaging claw portion 43 or the engaged portion 52 (in this example, the engaged portion 52). By providing the disengagement restricting convex portion 52a that engages with the other (engagement claw portion 43 in this example) and restricts the disengagement of the engagement claw portion 43 from the engaged portion 52, Even if the spring retainer 6 is not bonded or welded to the pressure regulating shaft 3 in a state where the claw portion 43 is engaged with the engaged portion 52, the engaging claw portion 43 is detached from the engaged portion 52. That is, since the spring retainer 6 can be preferably prevented from coming off from the pressure adjusting shaft 3, the manufacturing cost of the pressure reducing valve 1 can be further reduced by the amount that does not require adhesion or welding.

  Further, according to the pressure reducing valve 1, the communication path L that communicates the space S <b> 2 a between the other end portion 44 of the pressure regulating shaft 3 and the lid 31 (shaft guide portion 32) with the secondary chamber S <b> 2 is provided in the casing 2. By forming the pressure regulating shaft 3, for example, compared to forming a “communication path” in the pressure regulating shaft 3, the cost required for manufacturing the pressure regulating shaft 3 can be sufficiently reduced. Further reduction can be achieved.

  The configuration of the “pressure reducing valve” is not limited to the example of the configuration of the pressure reducing valve 1 described above. For example, a lock mechanism st1 that is an attachment structure of the lid 21 to the casing body 11, a lock mechanism st2 that is an attachment structure of the lid 31 to the casing body 11, and a lock mechanism that is an attachment structure of the spring retainer 6 to the pressure adjusting shaft 3 Although the example in which three of st3 are constituted by “bayonet locking attachment mechanism” has been described, the attachment structure of the lid body 21 to the casing body 11, the attachment structure of the lid body 31 to the casing body 11, and the spring to the pressure adjusting shaft 3 Either one or two of the retainer 6 mounting structures are constituted by a “bayonet locking type mounting mechanism”, and the other mounting structure is a screwed (bolted), or an attachment structure by bonding or welding. (Not shown). Even when such a configuration is adopted, the weight of the “pressure reducing valve” can be reduced and the manufacturing cost can be reduced by the amount corresponding to the mounting structure that employs the “bayonet lock-type mounting mechanism”.

  Further, the “first disengagement restriction” is applied to the engaged portion 16 which is an example of the “first engaged portion” as “one of the first engaging claw portion and the first engaged portion”. As an example, the configuration provided with the detachment restricting convex portion 16a, which is an example of the “convex portion for use”, is described as “one of the first engaging claw portion and the first engaged portion”. The "first engaging claw" is engaged with "the other of the first engaging claw and the first engaged part", and the "first engaged part" from the "first engaged part" It is also possible to employ a configuration in which a “first separation regulating convex portion” is provided so as to regulate the separation of the “one engaging claw portion” (not shown).

  Furthermore, the “second disengagement restriction” is applied to the engaged portion 18 which is an example of the “second engaged portion” as “one of the second engaging claw portion and the second engaged portion”. As an example, the configuration provided with the detachment restricting convex portion 18a, which is an example of the “convex portion for use”, is described as “one of the second engaging claw portion and the second engaged portion”. The “second engaging claw” is engaged with “the other of the second engaging claw and the second engaged portion” and the “second engaged portion” It is also possible to employ a configuration in which a “second disengagement restricting convex portion” is provided so as to restrict the disengagement of the “two engaging claws” (not shown).

  Further, the “third engagement restriction” which is an example of the “third engaged portion” as “one of the third engaging claw portion and the third engaged portion” is “third release restriction”. As an example, the structure provided with the detachment restricting convex portion 52a, which is an example of the “convex portion for use”, is described as “one of the third engaging claw portion and the third engaged portion”. The “third engaging claw portion” is engaged with “the other of the third engaging claw portion and the third engaged portion” and the “third engaged portion” It is also possible to employ a configuration in which a “third separation regulating convex portion” is provided so as to regulate the separation of the “3 engaging claws” (not shown).

  Furthermore, the number of “first engaging claws” and “second engaging claws” is not limited to two, but may be three or more (not shown). Further, the number of “first engaged portions” and “second engaging claws” is not limited to two, and may be three or more (not shown). Further, the number of “third engaging claws” is not limited to three, and may be two, or four or more (not shown). Further, the number of “third engaged portions” is not limited to three, and may be two, or four or more (not shown). In this case, the number of “first engaged parts”, “second engaged parts”, and “third engaged parts” is the same as the number of corresponding “engaging claws”. It is not limited to the configuration, but may be a number equal to or greater than the number of the corresponding “engaging claw portions” (a configuration in which the “engaging claw portions” do not engage with several “engaged portions”) (not shown). ) In addition, the number of “first separation restriction convex portions”, “second separation restriction convex portions”, and “third separation restriction convex portions” is two for each “engaged portion”. The above can also be provided (not shown).

  Furthermore, a diaphragm retainer 22 for fixing the outer edge portion of the diaphragm 4 to the one end 15 of the casing body 11 and a spring retainer 23 with which the coil spring 5 is brought into contact are formed separately and combined with each other. Although the example which comprises the cover body 21 which is an example of "1st member" was demonstrated, it is not necessary to adjust the length of the coil spring 5 in the casing 2 (the urging | biasing force of the pressure regulation shaft 3 by the coil spring 5). In this case, the “first member” can be configured by a member integrally formed with the diaphragm retainer 22 and the spring retainer 23 in the lid 21 (not shown).

DESCRIPTION OF SYMBOLS 1 Pressure-reducing valve 2 Casing 3 Pressure regulation shaft 4 Diaphragm 5 Coil spring 6 Spring retainer 11 Casing main body 12 Inlet 13 Discharge port 14 Valve seat part 15,42 One end part 16,18,52 Engagement part 16a, 18a, 52a Detaching Restricting convex portion 17, 44 Other end portion 21, 31 Lid 22 Diaphragm holder 23 Spring retainer 24, 33, 43 Engaging claw portion 24a, 33a Engaging recess 32 Shaft guide portion 34 Hole 41 Valve body portion 51 Insertion hole L Communication path S1 Primary chamber S2 Secondary chamber S2a Space st1 to st3 Lock mechanism

Claims (8)

A casing having a casing body provided with an inlet for introducing the liquid to be decompressed into the primary chamber and an outlet for ejecting the decompressed liquid from the secondary chamber;
A pressure regulating shaft that is provided in the casing so as to be capable of sliding with respect to the casing body, while being provided with a valve body portion capable of contacting the valve seat portion of the casing body;
A diaphragm housed in the casing and having a central portion fixed to one end portion of the pressure adjusting shaft and an outer edge portion fixed to the casing body;
A pressure regulating spring that is accommodated in the casing and biases the pressure regulating shaft in a direction to separate the valve body portion from the valve seat portion;
A pressure reducing valve comprising a spring abutting member housed in the casing and attached to the one end of the pressure regulating shaft so that the pressure regulating spring can come into contact with the casing;
The casing is attached to one end portion of the casing body so that the casing body and the pressure adjusting spring can come into contact with each other, and a first member that fixes the outer edge portion of the diaphragm to the one end portion of the casing body. A second member that is attached to the other end portion of the casing body and closes the other end portion and regulates the detachment of the pressure regulating shaft from the casing body,
At least one of an attachment structure of the first member to the casing body, an attachment structure of the second member to the casing body, and an attachment structure of the spring contact member to the one end portion of the pressure adjusting shaft is provided. A pressure reducing valve that consists of a bayonet lock mounting mechanism. The first member includes a plurality of first engaging claws that protrude from the first member body along the radial direction of the first member body formed in a circular shape,
The casing body is formed with a cylindrical shape at the one end so that the first member can be inserted, and a plurality of first engaged portions that can be engaged with the first engaging claws. Formed at the one end,
The pressure reducing valve according to claim 1, wherein the bayonet locking attachment mechanism is constituted by the first engaging claws and the first engaged portions.   One of the first engaging claw and the first engaged portion is engaged with the other of the first engaging claw and the first engaged portion. The pressure-reducing valve according to claim 2, wherein a first detachment regulating convex portion that regulates detachment of the first engaging claw portion from the first engaged portion is provided. The second member includes a plurality of second engaging claws protruding from the second member main body along the radial direction of the second member main body formed in a circular shape,
The casing body is formed with a cylindrical shape at the other end so that the second member can be fitted therein, and a plurality of second engaged portions capable of engaging with the second engaging claws. Is formed at the other end,
The pressure reducing valve according to any one of claims 1 to 3, wherein the bayonet locking attachment mechanism is configured by the second engaging claws and the second engaged portions.   One of the second engaging claw portion and the second engaged portion is engaged with the other of the second engaging claw portion and the second engaged portion. The pressure reducing valve according to claim 4, further comprising a second detachment regulating convex portion that regulates detachment of the second engaging claw portion from the second engaged portion. The pressure adjusting shaft is provided with a plurality of third engaging claws that protrude from the one end along the radial direction of the one end while the one end is formed in a columnar shape.
The spring contact member is provided with an insertion hole through which the one end portion of the pressure adjusting shaft can be inserted, and a plurality of third engaged portions capable of engaging with the third engaging claw portion. Formed at the mouth edge of the insertion hole,
The pressure reducing valve according to any one of claims 1 to 5, wherein the bayonet locking attachment mechanism is configured by the third engaging claw portions and the third engaged portions.   One of the third engaging claw portion and the third engaged portion is engaged with the other of the third engaging claw portion and the third engaged portion. The pressure reducing valve according to claim 6, wherein a third detachment restricting convex portion that restricts detachment of the third engaging claw portion from the third engaged portion is provided.   The decompression according to any one of claims 1 to 7, wherein a communication path for communicating a space between the other end portion of the pressure adjusting shaft and the second member with the secondary chamber is formed in the casing. valve.

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