JP2010121646A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve with a secondary side pressure releasing mechanism, having the size equal to an ordinary check valve, easily incorporated into an ordinary faucet, and easily implementing common use of parts with the ordinary check valve with a simple structure. <P>SOLUTION: This check valve has an annular valve seat 21, a check valve body 3 having a disc part 31 seated from the secondary side on the valve seat and a shaft party 32 projected to the primary side from the center of the disc part, a support 22 slidingly supporting the shaft part on its base end, a cap arranged on the primary side of the support so as to cover the shaft part, a spring 5 interposed between the shaft part tip and an opening end part of the cap, energizing the disc part toward the valve seat and energizing the cap toward the support, a secondary side pressure releasing communicating passage 30 for penetrating through the center of the check valve body, and an auxiliary valve element 42 arranged in the cap so as to open-close an outlet 300 of the communicating passage in response to an increase-decrease in secondary side pressure. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a check valve that is provided in the middle of a water supply channel and prevents backflow of water, and more particularly, to a check valve that includes a mechanism that releases abnormal pressure generated on the secondary side to the primary side. .
In this specification, the term “water” may be used to include hot water.

2. Description of the Related Art In various water supply facilities, a check valve is generally provided in the middle of a water supply channel, more specifically, on the primary side of an on-off valve provided in a faucet or the like.
By the way, in the case of a water supply facility with a check valve installed in the water supply channel, abnormal pressure is generated on the secondary side of the check valve, resulting in components of the on-off valve (thermostat type faucet, single lever type faucet). (Including the built-in cartridge) and check valve components are damaged, and the on / off valve handle operation becomes heavy.
For example, when a check valve is installed in a mixed faucet installed in a bathroom equipped with a hot-air circulating bathroom drying function or mist sauna function, the bathroom space or hot water supply pipe is maintained at a high temperature for a long time. As a result, the water accumulated in the water supply channel between the check valve and the open / close valve in the water stop mixer is heated, and the pressure in that part rises abnormally. There are cases where valves and check valves are damaged.
It is also known that abnormal pressure is generated on the secondary side of the check valve due to a water hammer (water hammer) due to a sudden water stop operation of the on-off valve, expansion due to freezing, etc., and the same problem as described above occurs. It has been.

Therefore, various check valves having a mechanism for releasing the abnormal pressure on the secondary side have been proposed.
As such a check valve, a valve seat provided in the sliding valve seat body is configured such that a sliding valve seat body slidably accommodated in a flow path is pressed by a first spring toward the secondary side. The check valve body seated in the seat is pressed by the second spring toward the primary side, the check valve body is provided with a relief valve seat, and the release valve body seated on the relief valve seat is the secondary side The thing pressed by the 3rd spring toward the front is known (refer the following patent document 1).
However, in the case of the above-described check valve, the use of the sliding valve seat body and the first spring that presses this toward the secondary side makes the total length considerably larger than that of a normal check valve. Therefore, it cannot be incorporated into a normal faucet or pipe joint as it is, and it has been necessary to modify the faucet etc. to apply. In addition, the above check valve has a complicated structure, and it is difficult to share parts with a normal check valve, and the number of parts is large, resulting in high manufacturing costs. was there.
JP-A-5-187567

  The object of the present invention is the same size as a normal check valve, can be easily incorporated into a normal faucet, etc., and has a simple structure and common parts with a normal check valve. Is to provide a check valve with a secondary side pressure relief mechanism.

  The check valve according to the present invention includes a check valve body having an annular valve seat provided in a water supply channel, a disc portion seated on the valve seat from the secondary side, and a shaft portion protruding from the center of the disc portion to the primary side. And a support body fixedly provided in the water supply path so as to slidably support the shaft portion of the check valve body at the base end or in the middle of the length, and so as to cover the shaft portion of the check valve body A cap disposed on the primary side of the support, and interposed between the tip end of the shaft portion of the check valve body and the opening end portion of the cap, urges the disc portion of the check valve body toward the valve seat. And a spring for urging the cap toward the support, a secondary pressure relief communication passage formed so as to penetrate the center of the check valve body, and a communication passage according to the increase or decrease of the secondary pressure. And an auxiliary valve body provided in the cap so as to open and close the outlet.

In the check valve of the present invention, when the pressure on the secondary side rises abnormally due to heating or the like in the water stop state where the disc portion of the check valve body is seated on the valve seat, the pressure is increased to the secondary side. By transmitting to the auxiliary valve body through the pressure relief communication passage, the cap with the auxiliary valve body moves to the primary side against the elastic force of the spring, and the outlet of the communication passage opens from here. Abnormal pressure, that is, a part of the water on the secondary side is released to the primary side. When the secondary pressure returns to normal, the cap moves to the secondary side by the elastic force of the spring, and the auxiliary valve element closes the outlet of the communication path. Therefore, according to the check valve of the present invention, since the abnormal pressure generated on the secondary side can be released to the primary side, the components of the on-off valve and the check valve are damaged or the handle of the on-off valve is operated. Can be avoided reliably.
In addition to the above, since the check valve of the present invention does not use a sliding valve seat body or a spring for biasing it as in the prior art, it is a normal check valve that does not have a secondary pressure relief mechanism. It is almost the same size as the valve, and can be easily incorporated into ordinary water faucets and pipe fittings.
In addition, in the case of the check valve of the present invention, since the check valve body and the cap with the auxiliary valve body are urged in a relative direction by a single spring, the structure is simple compared to the prior art. Since the number of parts is small and it is easy to share parts with a normal check valve, the manufacturing cost can be reduced.

  More preferably, the check valve according to the present invention further includes a cylindrical housing that is fitted into and fixed to the water supply channel and forms a part of the wall surface of the water supply channel, and the valve seat is configured by the secondary side end surface of the housing. The support is constituted by the secondary side end wall of the housing having the shaft insertion hole and the water passage hole, and the shaft portion, the cap and the spring of the check valve body are accommodated in the housing.

  If the check valve has a housing as described above, the check valve can be unitized, so it can be easily assembled to a faucet, etc., and maintenance work such as replacement of consumable parts is also performed. easy.

  In the check valve according to the present invention, the check valve body constitutes the first valve body member constituting the secondary side portion of the disc portion, the primary side portion and the shaft portion of the disc portion, and the first valve body member. A second valve body member fitted and fixed to, an annular non-return packing having a seal portion sandwiched between the peripheral portions of the first valve body member and the second valve body member and brought into contact with the valve seat; A cylindrical spring receiving member that is fitted to the tip of the shaft portion of the second valve body member, and a secondary pressure relief is provided by a through-hole formed in the center of the first valve body member and the second valve body member. There are cases where a communication passage is configured.

  If the check valve body is configured as described above, it is easy to manufacture and assemble the parts, and the check packing can be easily replaced. In addition, if the check valve body is configured as described above, it is easy to share parts with a normal check valve having no secondary pressure relief mechanism, which is advantageous in terms of manufacturing cost.

  In the check valve according to the present invention, a cap is fitted and fixed to the cap main body so that the cap main body, the auxiliary packing housed in the cap main body and constituting the auxiliary valve body, and the auxiliary packing can be pressed at one end. A cylindrical packing holder having a spring receiving portion at the end may be provided.

  If the cap is configured as described above, it is easy to manufacture and assemble each component, and it is possible to easily replace the auxiliary packing.

  When the cap is configured as described above, a plurality of guide ribs that are in sliding contact with the wall surface of the water supply channel may be formed on the outer peripheral surface of the cap body at intervals in the circumferential direction.

  If the guide rib as described above is formed on the cap body, it is possible to effectively suppress the vibration of the cap and the check valve body and the accompanying noise.

1 to 5 show an embodiment of the present invention. In this embodiment, the present invention is applied to a check valve incorporated in a mixing faucet for a bathroom.
In the following description, the lower side of FIGS. 1, 3 and 4 is referred to as “front”, and the same is referred to as “rear”, and the front side of these figures is referred to as “upper” and the rear side thereof is referred to as “lower”. And

The illustrated check valve (1) includes an annular valve seat (21) provided in the water supply channel, a disc portion (31) seated on the valve seat (21) from the secondary side, and the center of the disc portion (31). A check valve body (3) having a shaft portion (32) projecting to the primary side, and a water supply passage so as to slidably support the shaft portion (32) of the check valve body (3) at its proximal end And a cap (4) disposed on the primary side of the support (22) so as to cover the shaft portion (32) of the check valve body (3), The disc part (31) of the check valve body (3) is interposed between the tip of the shaft part (32) of the check valve body (3) and the open end part of the cap (4) to the valve seat (21). A spring (5) for urging the cap (4) toward the support (22) and a center of the check valve body (3). The secondary pressure relief communication passage (30) and the auxiliary valve provided in the cap (4) so as to open and close the outlet (300) of the communication passage (30) according to the increase or decrease of the secondary pressure. A body (42).
Further, the check valve (1) includes a cylindrical housing (2) that is fitted and fixed in the water supply path and forms a part of the wall surface of the water supply path. The valve seat is constituted by a secondary side end face (= front end face) (21) of the housing (2). The support is constituted by a secondary side end wall (= front end wall) (22) of the housing (2). The shaft (32), the cap (4) and the spring (5) of the check valve body (3) are accommodated in the housing (2).

The housing (2) is inserted into a cylindrical water inlet (710) formed on the rear surface of the faucet body (71) of the mixing faucet (7).
An annular flange portion (23) is formed at the rear end portion of the housing (2). The flange portion (23) is clamped between the front end surface of the water introduction port portion (710) and the front end surface of the water supply pipe joint (8) that is screwed to the water introduction port portion (10). Thereby, the housing (2) is fixed. An annular seal member (91) is interposed between the flange portion (23) and the front end face of the water supply pipe joint (8).
On the outer peripheral surface of the housing (2), an annular groove (24) is formed in the middle of its length. A sealing member (92) such as an O-ring that seals between the housing (2) and the water introduction port (710) is disposed in the concave groove (24).
The front end surface (21) of the housing (2) constituting the valve seat is a flat surface.
The front end wall (22) of the housing (2) constituting the support has a circular shaft insertion hole (221) at the center thereof, and four substantially fan-shaped water passage holes around the hole (221). (See FIG. 2).
The housing (2) is integrally formed of synthetic resin.

The check valve body (3) constitutes the first valve body member (3A) constituting the secondary side portion of the disc portion (31), and the primary side portion and the shaft portion (32) of the disc portion (31). In addition, the second valve body member (3B) fitted and fixed to the first valve body member (3A) is clamped between the peripheral portions of the first valve body member (3A) and the second valve body member (3B). And a non-return packing (3C) having a seal portion (313) that is brought into contact with the valve seat (21), and a cylindrical spring that is fitted to the tip of the shaft portion (32) of the second valve body member (3B) It consists of a receiving member (3D).
The secondary pressure relief communication passage (30) is constituted by through holes (301) and (308) opened in the center of the first valve body member (3A) and the second valve body member (3B). .
The first valve body member (3A), the second valve body member (3B), and the spring receiving member (3D) are each integrally formed of synthetic resin. The check packing (3C) is made of rubber such as EPDM.

The first valve body member (3A) has a dish-like shape in which the rear surface side is recessed, and a through hole (301) is formed in the center thereof. The front end side of the through hole (301) is a small-diameter hole having a hole diameter of, for example, about 0.5 mm, and the rear end side thereof is a tapered hole whose diameter gradually increases.
A cylindrical rear protrusion (302) is formed around the through hole (301) on the rear surface of the first valve body member (3A). The cylindrical rear convex portion (302) is formed with two left and right slits (303) extending in the front-rear direction (see FIG. 5). Further, two upper and lower engaging claws (304) are formed on the outer peripheral surface of the cylindrical rear convex portion (302) (see FIG. 5).
The peripheral portion of the rear surface of the first valve body member (3A) is flat, and an annular rib (305) is formed in the middle of the width thereof.

The second valve body member (3B) includes a dish-like portion (306) whose front side is recessed, a shaft portion (32) protruding rearward from the center of the dish-like portion (306), and a front side from the dish-like portion (306). And a cylindrical front convex portion (307) fitted on the cylindrical rear convex portion (302) of the first valve body member (3A).
In the through hole (308), a portion from the center of the front surface of the dish-shaped portion (306) to the tip of the shaft portion (32) is a tapered hole that gradually decreases in diameter toward the rear, and the through-hole (308) The tip portion of the shaft portion (32) constituting the outlet (300) is a small-diameter hole having a hole diameter of about 0.4 mm, for example.
The diameter of the dish-like portion (306) is slightly smaller than the diameter of the first valve body member (3A). The peripheral edge of the front surface of the dish-shaped portion (306) is flat, and an annular groove (309) is formed in the middle of the width. The rear surface of the dish-shaped portion (306) has a truncated cone shape that swells rearward, and the front surface of the front end wall (22) of the housing (2) has a mortar shape along the rear surface. .
The cylindrical front convex portion (307) is formed with two upper and lower locking holes (310) for locking the engaging claws (304) of the first valve body member (3A) (see FIG. 5). Moreover, the front end part of the cylindrical front convex part (307) is notched on the left and right sides located between the two engagement holes (310).
The tip end surface of the shaft portion (32) has a conical shape, and the outlet (300) of the communication passage (30) is located at the apex thereof. An annular groove (311) is formed near the tip of the outer peripheral surface of the shaft (32).

An annular groove (312) into which the annular rib (305) of the first valve body member (3A) is fitted is formed on the front surface of the check packing (3C).
An annular rib (315) that fits into the annular groove (309) of the dish-like portion (306) of the second valve body member (3B) is formed inside the rear surface of the check packing (3C).
The seal part brought into contact with the valve seat (21) is configured by an annular convex part (313) having a substantially semicircular cross section formed outside the rear surface of the check packing (3C).

  The spring receiving member (3D) has two upper and lower slits (314) extending forward from the rear end (see FIG. 5). On the inner peripheral surface of the spring receiving member (3D), on the left and right side portions located between the two slits (314), in the annular groove (311) of the shaft portion (32) of the second valve body member (3B). An engaging claw (312) to be locked is formed. An annular flange portion (313) is provided at the rear end portion of the spring receiving member (3D), and one end portion of the spring (5) is received by the flange portion (313).

  The cap (4) includes a cap body (41), an auxiliary packing (42) accommodated in the cap body (41) and constituting an auxiliary valve body, and a cap so that the auxiliary packing (42) can be pressed at one end. It consists of a cylindrical packing holder (43) fitted and fixed to the main body (41) and having a spring receiving part (431) at the other end.

The cap body (41) has a top wall (411) and a peripheral wall (412) extending forward from the periphery of the top wall (411).
On the outer surface of the peripheral wall (412), four guide ribs (44a) and (44b) that are in sliding contact with the inner peripheral surface (= the wall surface of the water supply channel) of the housing (2) are formed at equal intervals in the circumferential direction. ing. The two left and right guide ribs (44a) are of a small size formed at the rear end of the outer surface of the peripheral wall (412). On the other hand, the two upper and lower guide ribs (44b) are of a large size having a length over almost the entire length of the peripheral wall (412) (see FIG. 5).
The peripheral wall (412) has two left and right locking holes (414).
Further, four slits (413) extending rearward from the front end of the peripheral wall (412) are formed so as to be positioned between the adjacent guide ribs (44a) (44b) at equal intervals in the circumferential direction. (See FIG. 5).

  The auxiliary packing (42) has a bottomed cylindrical shape covering from the inner surface of the top wall (411) of the cap body (41) to the middle height of the inner surface of the peripheral wall (412). The thickness is larger on both the front and rear sides compared to the remaining portion, and the same portion abuts on the tip of the shaft portion (32) of the second valve body member (3B) and opens the outlet (300) of the communication hole (30). A closing seal portion (421) is formed.

On the outer peripheral surface of the packing holder (43), two engaging claws (432) are formed which are locked to the locking holes (414) of the cap body (41).
The spring receiving portion is formed by an annular inward convex portion (431) having an L-shaped cross section formed at the front end portion of the packing holder (43) and bent at the front end, and the front end of the spring (5). Have received the department.

  The spring (5) is made of a metal compression coil spring and has an appropriate spring elastic force according to the water supply pressure, the assumed secondary abnormal pressure, or the like.

Next, the function of the check valve (1) will be described with reference to FIGS.
First, in the normal water stop state in which the on-off valve (not shown) of the mixing faucet (7) is closed, as shown in FIGS. 1 and 2, the disc portion (31) of the check valve body (3). Is seated on the valve seat (21), and the water passage (222) of the front end wall (22) of the housing (2) constituting the support is closed.
And in the water flow state which opened the on-off valve, as shown in FIG. 3, the non-return valve body (3) which received the flowing water pressure from a primary side resisted the elastic force of a spring (5), and was secondary. To the side, thereby opening the water channel (222) and allowing water to flow.
Moreover, in the water stop state in which the open / close valve (not shown) of the mixing faucet (7) is closed, for example, when the hot air bathroom drying apparatus is operated for a long time, the open / close valve and the check valve (1) Water accumulated during the period may be heated from the outside, and thereby the pressure on the secondary side of the check valve (1) may rise abnormally. In this case, as shown in FIG. 4, the pressure on the secondary side is transmitted to the auxiliary valve body (42) through the secondary pressure relief communication passage (30) of the check valve body (3). The cap (4) having the interior (42) moves to the primary side against the elastic force of the spring (5), and the outlet (300) of the communication passage (30) opens, from which the secondary side abnormality occurs. Pressure, that is, a part of the water on the secondary side is released to the primary side. When the pressure on the secondary side returns to normal, the cap (4) moves to the secondary side by the elastic force of the spring (5), and the auxiliary valve element (42) moves to the outlet (300) of the communication passage (30). Close. Thus, the problem that the abnormal pressure on the secondary side of the check valve (1) is eliminated, the components of the on-off valve and the check valve (1) are damaged, and the handle operation of the on-off valve becomes heavy. Is definitely avoided.

Further, the check valve (1) biases the check valve body (3) and the cap (4) with the auxiliary valve body (42) in a relative direction by one spring (5). The size of the check valve is almost the same as that of a normal check valve that does not have a secondary pressure relief mechanism, and can be easily incorporated into a normal water faucet or pipe fitting. Compared with, the structure is simple, the number of parts is small, and the manufacturing cost can be suppressed.
In addition, in the case of the above-described check valve (1), for example, the first check valve body (3A) is replaced with one having the same structure except that the through hole (301) is not opened. For example, it can be used as a normal check valve having no secondary pressure relief mechanism. Therefore, according to the above-described check valve (1), it is possible to easily share parts and to further reduce the manufacturing cost.
Further, the check valve (1) is composed of a housing (2), a check valve body (3), a cap (4) and a spring (5) and is unitized. Since the check valve body (3) and the cap (4) are each assembled with a plurality of parts, manufacturing is simple and maintenance work such as replacement of consumable parts is also easy. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a horizontal sectional view showing an embodiment of the present invention and showing a check valve in a normal water stop state. FIG. 2 is a vertical sectional view of a check valve along the line II-II in FIG. 1. It is a horizontal sectional view showing a check valve in a water flow state. It is a horizontal sectional view showing a check valve when abnormal pressure is generated on the secondary side in a water stop state. It is a disassembled perspective view of a check valve.

Explanation of symbols

(1): Check valve (2): Housing (21): Secondary side end face (valve seat)
(22): Secondary end wall (support)
(221): Shaft portion insertion hole (222): Water passage hole (3): Check valve body (30): Secondary pressure relief communication passage (300): Outlet (31): Disk portion (32): Shaft (3A): first valve body member (301): through hole (3B): second valve body member (308): through hole (3C): check packing (313): seal part (3D): spring Receiving member (4): Cap (41): Cap body (42): Auxiliary packing (auxiliary valve body)
(43): Packing holder (431): Spring receiving part (44a) (44b): Guide rib

Claims (5)

  An annular valve seat (21) provided in the water supply channel, a disc portion (31) seated on the valve seat (21) from the secondary side, and a shaft portion (32) protruding from the center of the disc portion (31) to the primary side ) And a shaft portion (32) of the check valve body (3) are fixedly provided in the water supply passage so as to be slidably supported at the base end or in the middle of the length. A support (22), a cap (4) disposed on the primary side of the support (22) so as to cover the shaft (32) of the check valve (3), and a check valve (3) ) Between the tip of the shaft portion (32) and the opening end portion of the cap (4) to urge the disc portion (31) of the check valve body (3) toward the valve seat (21). A spring (5) that urges the cap (4) toward the support (22) and 2 formed so as to penetrate the center of the check valve body (3). A side pressure relief communication passage (30) and an auxiliary valve body (42) provided in the cap (4) so as to open and close the outlet (300) of the communication passage (30) according to the increase or decrease of the secondary pressure. And a check valve.   It further includes a cylindrical housing (2) that is fitted and fixed in the water supply channel to form a part of the wall surface of the water supply channel, and the valve seat is configured by the secondary side end surface (21) of the housing (2). A support body is constituted by the secondary end wall (22) of the housing (2) having the insertion hole (221) and the water passage hole (222), and the shaft portion of the check valve body (3) is formed in the housing (2). Check valve (1) according to claim 1, characterized in that (32), a cap (4) and a spring (5) are accommodated.   The check valve body (3) constitutes the first valve body member (3A) constituting the secondary side portion of the disc portion (31), and the primary side portion and the shaft portion (32) of the disc portion (31). In addition, the second valve body member (3B) fitted and fixed to the first valve body member (3A) is clamped between the peripheral portions of the first valve body member (3A) and the second valve body member (3B). And a non-return packing (3C) having a seal portion (313) that is brought into contact with the valve seat (21), and a cylindrical spring that is fitted to the tip of the shaft portion (32) of the second valve body member (3B) And a receiving member (3D) for secondary pressure relief by a through hole (301) (308) opened in the center of the first valve body member (3A) and the second valve body member (3B). Check valve according to claim 1 or 2, characterized in that the communication passage (30) is configured.   The cap (4) has a cap body (41), an auxiliary packing (42) accommodated in the cap body (41) and constituting an auxiliary valve body, and a cap so that the auxiliary packing (42) can be pressed at one end. A cylindrical packing holder (43) fitted and fixed to the main body (41) and having a spring receiving part (431) at the other end thereof, according to any one of claims 1 to 3, The check valve described.   5. A plurality of guide ribs (44a) (44b) slidingly contacting the wall surface of the water supply channel are formed on the outer peripheral surface of the cap body (41) at intervals in the circumferential direction. Check valve.

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