JP7175497B2 - Check valve - Google Patents

Description

TECHNICAL FIELD The technology disclosed in the present application relates to check valves, and more particularly to those capable of mitigating abnormal pressure increases on the secondary side.

2. Description of the Related Art Conventionally, a check valve is often incorporated inside a faucet device used in a water heater or the like, or in a water supply pipe or a hot water supply pipe connected to the faucet device. In addition to the function of preventing backflow of fluid, this check valve also prevents the check valve itself and the secondary side from abnormally increasing pressure due to water hammer or volumetric expansion of the fluid. In order to protect the various components located in the side flow path, some are equipped with pressure relief valves as disclosed, for example, in US Pat.

Patent Document 1 discloses a check valve seat formed in a fluid passage that communicates between a primary side and a secondary side, and a check valve body that is seated on the check valve seat and capable of closing and opening the fluid passage. , and a first biasing member that biases the check valve body in a direction to seat the check valve seat on the check valve seat, in which the check valve body includes a relief flow path leading from the secondary side to the primary side and ( A relief valve seat formed at the primary end of the relief flow path is provided, and a relief valve body that can be seated on the relief valve seat to close and open the relief flow path is provided outside the check valve body. , and a second biasing member that biases the relief valve body in a direction to seat it on the relief valve seat.

Japanese Patent No. 6059581

The check valve described in Patent Literature 1 has a pressure relief valve configuration in addition to the check valve, which complicates the configuration of the check valve itself and increases the manufacturing cost. .

The technology disclosed in the present application has been proposed in view of the above problems, and the number of parts is minimized by adding new processing to the parts constituting the check valve to enable pressure relief. To provide a check valve capable of reducing the manufacturing cost by suppressing the pressure to a low pressure, and capable of reliably releasing the secondary pressure to the primary side when an abnormal pressure rise occurs on the secondary side.

In order to achieve the above object, a check valve according to claim 1 comprises: a valve seat formed in a fluid passage communicating between a primary side and a secondary side; A check valve comprising a valve body and an urging member that biases the valve body in a direction to seat the valve body on a valve seat, wherein the valve body is a seal member made of an elastic member that is seated on the valve seat; It is composed of a holder member that holds the seal member with an interference at the primary side end, and the holder member has a pressure introduction hole through which the seal member receives pressure from the secondary side and a pressure relief hole that communicates with the primary side. is provided so that the sum of the hole diameter areas of the pressure relief holes is set to be equal to or greater than the sum of the hole diameter areas of the pressure introduction holes, and either the holder member or the seal member has a gap between the pressure introduction hole and the pressure relief hole. 3, the holder member and the sealing member are provided with a projection projecting in the opposing direction at a portion where the holder member and the seal member are in contact with each other.

The check valve according to claim 2 is the check valve according to claim 1, wherein the protrusion is provided on the inner peripheral surface of the seal member when provided on the holder member, and on the outer periphery of the holder member when provided on the seal member. It is characterized in that it is provided in an annular shape along the surface.

A check valve according to claim 3 is the check valve according to claim 1 or 2, wherein the holder member includes a holder portion that holds the seal member with an interference at the primary side end portion and a secondary side end portion. and a guide tube coaxially extending in a direction, and a guide section is formed in the fluid passage that connects the primary side and the secondary side so that the guide tube can slide along the fluid passage. It is characterized by

A check valve according to claim 4 is the check valve according to claim 3, in which the holder member is made of a hard material, and the holder part has substantially the same shape and diameter as the seal member. a disc-shaped base portion that is attached to the base portion, a mounting cylindrical portion that protrudes toward the primary side from the center portion of the surface of the base portion facing the seal member and into which the seal member is coaxially inserted, and a retainer piece that prevents the seal member from coming off. A pressure introduction hole is provided in the attachment cylinder portion, and a pressure release hole is provided in the retainer piece.

The check valve according to claim 5 is the check valve according to claim 4, wherein the protrusion is provided on the mounting cylinder when provided on the holder member, or on the mounting cylinder of the holder member when provided on the seal member. It is provided between the pressure introduction hole and the retaining piece on the inner peripheral surface that abuts on the part.

In the check valve according to claim 1, when the pressure on the secondary side exceeds a predetermined pressure (abnormal pressure rise), the seal member is pressed by the secondary side pressure received from the pressure introduction hole provided in the holder member. A gap is generated between the holder member and the seal member, and the pressure introduction hole and the pressure relief hole communicating with the primary side (provided in the holder member) communicate to release the secondary side pressure to the primary side. Therefore, unlike the check valve disclosed in Patent Document 1, there is no need to add a configuration of a pressure relief valve in addition to the check valve. Therefore, the number of constituent parts can be minimized, and the manufacturing cost can be reduced.

In addition, since the sum of the hole diameter areas of the pressure relief holes is set to be equal to or larger than the sum of the hole diameter areas of the pressure introduction holes, for example, when the check valve according to the present invention is provided in a water supply pipe, an abnormality on the secondary side As described above, when the pressure on the secondary side is released from the pressure introduction hole to the primary side through the gap between the holder member and the seal member and the pressure release hole, the pressure from the secondary side to the primary side Water can be easily discharged, and water can be prevented from remaining in the communication passage formed by the pressure introduction hole, the gap formed between the holder member and the seal member, and the pressure relief hole. As a result, it is possible to prevent malfunction of the check valve due to residual water.

Further, either the holder member or the seal member is provided in a direction facing the part where the seal member deformed by the secondary pressure received from the pressure introduction hole abuts (for the holder member, the direction of the seal member, for the seal member, Since the projection projecting toward the direction of the holder member) is provided, immediately after the secondary side pressure is released to the primary side, the projection causes the holder member and the seal member to come into contact with each other ( Since the flow path from the secondary side to the primary side (consisting of the pressure introduction hole and the holder member) can be closed, reverse flow from the primary side to the secondary side can be suppressed.

In the check valve according to claim 2, when the protrusion is provided on the holder member, it is provided on the inner peripheral surface of the seal member, and when the protrusion is provided on the seal member, it is provided annularly along the outer peripheral surface of the holder member. , opening and closing of the flow path from the secondary side to the primary side (consisting of the pressure introduction hole and the holder member) by the projection can be efficiently and effectively carried out.

In the check valve according to claim 3, the holder member is provided with a guide cylinder extending coaxially in the direction of the secondary side, and the guide cylinder is in the fluid passage connecting the primary side and the secondary side. The check valve can be smoothly closed and opened by forming a guide portion that can slide along the guide portion.

In the check valve according to claim 4, the holder portion for holding the seal member is composed of a base portion having the same shape and diameter as the seal member, a mounting cylindrical portion into which the seal member is coaxially inserted, and a retainer piece that prevents the seal member from coming off. With this configuration, the secondary side pressure is received by the base portion (made of a hard member) adjacent to the secondary side of the seal member, so that the valve body can stably receive the secondary side pressure. The check valve can stably close and open.

In addition, by providing a pressure introduction hole in the mounting cylinder into which the seal member is inserted and a pressure release hole in the retaining piece, the pressure introduction hole and the holder member efficiently release pressure from the secondary side to the primary side. can be formed.

In the check valve according to claim 5, when the secondary side becomes abnormally pressurized, the seat member is provided with a pressure introduction hole that receives the secondary side pressure and a pressure release hole that communicates with the primary side. A convex portion is provided in the mounting cylinder portion between As a result, the sheet member is deformed (by the formed gap), and after the secondary side pressure is released to the primary side, the sheet member returns to its original state. , the pressure relief passage from the secondary side to the primary side can be quickly and reliably closed.

1(A) is a cross-sectional view showing a state in which a check valve body is seated on a valve seat, and (B) is a cross-sectional view showing a normal water flow state of a check valve according to an embodiment of the present invention. FIG. FIG. 4 is a side view of a holder that is a feature of the check valve of the present embodiment and a view viewed from the right side of the drawing. (B) AA arrow view (perspective view) and (C) BB arrow view (perspective view) in the side view of (A) of the holder. 4A and 4B are diagrams for explaining the effects of the pressure relief mechanism of the check valve when (A) the valve is normally closed and (B) when the secondary side abnormal pressure rise. It is the figure explaining the state where the (A) holder concerning other embodiment, the (B) side see-through view of valve packing, and (C) valve packing were inserted in the holder.

First, a check valve 1, which is an embodiment of the present invention, will be described with reference to the drawings.

The check valve 1 of the present embodiment can be used by being incorporated in a hot water supply circuit including, for example, a water heater. FIG. 1 shows a state in which the check valve 1 is installed in the pipe 2. As shown in FIG. FIG. 1(A) is a cross-sectional view showing a state in which the valve body 5 is seated on the valve seat 6 in the check valve 1, and FIG. 1(B) is a cross-sectional view showing a normal water flow state. It is a diagram. In the figure, the right side of the check valve 1 is the primary side, and the left side is the secondary side.

A housing 3 of the check valve 1 is formed in a cylindrical shape by a hard member such as a synthetic resin material, and a fluid passage 4 is formed therein. An O-ring 13 is fitted in a concave portion 14 provided on the outer peripheral portion of the primary side of the housing 3 so that the housing 3 is sealed against the inner peripheral surface of the pipe 2 . A valve seat 6 on which a valve element 5 can be seated is formed in the housing 3 at a position slightly inward from the primary side opening. On the other hand, a holding member 7 is attached to the secondary side opening of the housing 3 .

The holding member 7 has a ring-shaped mounting portion 8 formed on the outer peripheral side, and a holding cylinder 9 extending in the axial direction is formed in the central portion. The mounting portion 8 and the holding tube 9 are connected by a plurality of radially extending connecting pieces 10, and openings 11 are formed between the connecting pieces 10 through which fluid passes. An insertion hole 19 for slidably supporting the holder 12 of the valve body 5 is formed through the holding cylinder 9 along the axial direction.

The valve element 5 includes a valve packing 18 that can be seated on the valve seat 6 and a holder 12 that supports the valve packing 18 . The valve packing 18 is made of, for example, an elastic member such as fluororubber, and has a disc shape as a whole. The central portion of the valve packing 18 is thick and forms a thick portion 18a that protrudes in both the front and back directions in a disc shape.

The holder 12 is integrally formed of, for example, a hard member such as a synthetic resin material, and has a disk-shaped base portion 12a. The base portion 12a is formed to have substantially the same diameter as the outer diameter of the valve packing 18, and the outer peripheral edge thereof is formed with a tapered surface 20 that slopes down toward the secondary side. At the center of the surface of the base portion 12a facing the valve packing 18, a mounting cylinder portion 12b projects toward the primary side. A valve packing 18 is coaxially inserted into the mounting cylinder portion 12b. A disc-shaped retainer piece 24 having an outer diameter larger than the outer diameter of the mounting cylinder portion 12b is formed integrally with the holder 12 at the primary side end portion of the mounting cylinder portion 12b. The valve packing 18 is attached so as to prevent it from slipping off while sandwiching the base portion 12a between the valve packing 18a and the base portion 12a.

A pressure introduction hole 26 and a rib 25 are provided at the primary side end of the attachment cylinder portion 12b, and a cross-shaped depressed portion 24a having a pressure relief hole 24b shown in FIG. is provided. The pressure introduction hole 26, the rib 25, the pressure relief hole 24b and the depression 24a will be described in detail later, so they will not be described in detail here.

A guide tube portion 12c protrudes toward the secondary side from the surface of the base portion 12a opposite to the side on which the attachment tube portion 12b is formed. The guide tube portion 12c is coaxial with the attachment tube portion 12b and has an outer diameter larger than that of the attachment tube portion 12b. The guide tube portion 12c is slidably inserted into the insertion hole 19 of the holding tube 9 in the holding member 7, and the tip thereof penetrates to the secondary side. A spring 17 is interposed between the base portion 12a of the holder 12 and the portion of the holding member 7 around the holding tube 9 around the guide tube portion 12c. The spring 17 biases the valve body 5 in the direction of closing the valve, that is, in the direction of seating the valve packing 18 on the valve seat 6 .

Further, the holder 12 is formed with openings 21 and 22 that are continuous along the axis. The opening diameter of the opening 21 communicating with the secondary side is slightly larger than the opening diameter of the opening 22 . The primary side end portion of the opening portion 22 is open to the position of the attachment cylinder portion 12b and is closed before the retainer piece 24. As shown in FIG. A pressure introducing hole 26 penetrating outward (to the side of the valve packing 18) is provided at the position of the mounting cylinder portion 12b. The pressure introduction hole 26 is normally closed by a valve packing 18, as shown in FIG. Here, in the present embodiment, of the openings 21 and 22 that communicate with the secondary side, the opening 21 has a larger opening diameter than the opening 22, but the opening 21 and the opening 22 is not limited to this, and the opening diameters of the openings 21 and 22 may be the same. This simplifies the processing of the holder 12 and reduces the cost.

Next, the effects of the check valve 1 according to this embodiment configured as described above will be described.

When no fluid is flowing in the pipe 2, the valve body 5 is seated on the valve seat 6 by the biasing force of the spring 17, as shown in FIG. 1A. backflow is blocked. When the fluid starts to flow in the pipe 2, the water pressure on the primary side acts on the valve packing 18 of the valve body 5 as indicated by the arrow (1) in FIG. 1B. Then, as shown by arrow (2), the valve body 5 is separated from the valve seat 6 while compressing the spring 17, and the valve is opened. As a result, as indicated by an arrow (3), the fluid enters the housing 3 through the inner side of the valve seat 6, passes through the openings 11 between the connecting pieces 10 of the holding member 7, and flows through the piping 2 to the secondary. flow to the side. In this manner, the check valve 1 according to this embodiment exhibits the effects of a check valve.

Next, the pressure relief mechanism that characterizes the present invention will be described with reference to the drawings. For example, when the water tap is closed rapidly, the valve body 5 is seated on the valve seat 6 by the biasing force of the spring 17 and the valve is closed due to the stoppage of water supply, but the water hammer phenomenon occurs on the secondary side. As a result, the pressure in the pipe 2 on the secondary side may be increased at once. In such a case, the pressure relief mechanism relieves the pressure generated on the secondary side to the primary side to alleviate the excessive back pressure on the secondary side, thereby preventing the valve body 5 from being deformed or damaged. to avoid

2 and 3 are diagrams illustrating details of the holder 12, which is a feature of the present invention. 2A and 2B are a side perspective view of the holder 12 and a perspective view from the retainer piece 24. FIG. FIG. 2(B) is a side perspective view of the holder 12 in a state where FIG. 2(A) is rotated 90° as indicated by the arrow (1), and a perspective view as seen from the retainer piece 24. FIG. (C) of FIG. 2A is a side perspective view of the holder 12 in a state in which (A) of FIG. 3A and 3B are diagrams illustrating the details of the pressure introduction hole 26, the rib 25, and the pressure relief hole 24b formed in the holder 12. FIG. ), and (C) of FIG. 3 is a perspective view of BB in (A) of FIG.

As shown in FIG. 2, a columnar restriction portion 12d is formed from the base portion 12a toward the guide tube portion 12c. The outer diameter of the restriction portion 12d is set slightly larger than the outer diameter of the guide cylinder portion 12c, and when the check valve 1 is opened, it comes into contact with the holding cylinder 9 to prevent the movement of the valve body 5 to the primary side. It is designed to regulate.

A pressure introducing hole 26 is formed in the mounting cylinder portion 12b into which the valve packing 18 is coaxially inserted. The pressure introduction hole 26 is a columnar through hole penetrating from the opening 22 of the holder 12 toward the outside. Since the opening 22 communicates with the secondary side via the opening 21, the pressure introduction hole 26 also communicates with the secondary side (via the opening 21 and the opening 22). An annular rib 25 is formed on the mounting cylinder portion 12b between the pressure introduction hole 26 and the retainer piece 24 and protrudes outward in an arc shape along the outer circumference of the mounting cylinder portion 12b. .

In addition, as shown in FIG. 2, a cross-shaped depressed portion 24a is provided on the primary side surface of the retaining piece 24, and pressure relief holes 24b, 24b, 24b, and 24b are formed at the four ends of the cross. there is As shown in FIG. 3C, the pressure relief holes 24b, 24b, 24b, 24b are arc-shaped through holes that pass through the retainer piece 24 along the outer peripheral surface of the mounting cylinder portion 12b. In this embodiment, the sum of the hole diameter areas of the four pressure relief holes 24b, 24b, 24b, 24b is set to be equal to or larger than the hole diameter area of the pressure introduction hole 26. FIG. As will be described later, when the pressure on the secondary side is abnormally increased, when the pressure on the secondary side is released to the primary side through the pressure introduction hole 26 and the pressure relief hole 24b, the pressure from the secondary side to the primary side is reduced. Water can be easily discharged, and water can be prevented from remaining in the communicating passage formed by the pressure introducing hole 26, the mounting cylinder portion 12b, the valve packing 18, and the pressure relief hole 24b. As a result, it is possible to prevent the check valve 1 from malfunctioning due to residual water.

Next, the effects of the pressure relief mechanism of the check valve 1 according to this embodiment configured as described above will be described.

4A and 4B are diagrams for explaining the effects of the pressure relief mechanism of the check valve 1 according to the present embodiment. FIG. 4A shows the state of the pressure relief mechanism when the check valve 1 is normally closed, and FIG. It is the figure which showed the state of the pressure relief mechanism when the pressure in the piping 2 of the following side rises at once.

When the check valve 1 is normally closed, as shown in the enlarged view (A-1) of FIG. 18 abuts against a rib 25 provided on the mounting tube portion 12b to isolate the secondary side and the primary side of the pressure relief mechanism.

When the check valve 1 is normally closed and the pressure in the secondary side pipe 2 increases suddenly as indicated by the arrow (1) in FIG. 4B, the pressure communicating with the secondary side The increased secondary side pressure is introduced to the valve packing 18 via the introduction hole 26 as indicated by arrow (2). Since the valve packing 18 is made of an elastic member such as fluororubber, the portion of the valve packing 18 facing the pressure introduction hole 26 is pressed by the introduced secondary side pressure, and the pressure shown in FIG. As indicated by an arrow (3) in the enlarged view (B-1) of FIG. As a result, a communication passage consisting of the pressure introduction hole 26, the gap between the mounting cylinder portion 12b and the valve packing 18, and the pressure relief hole 24b is formed on the secondary side as indicated by arrow (4). pressure can be released to the primary side. After the pressure is released, the valve packing 18 abuts against the rib 25 so that the secondary side and the primary side can be isolated before the valve packing 18 is restored to its original state. Therefore, after the pressure generated on the secondary side is released to the primary side, backflow from the primary side to the secondary side can be suppressed.

As described above, in the check valve 1 according to the present embodiment, the parts (the holder 12 in the present embodiment) constituting the check valve are additionally processed so that the check valve disclosed in Patent Document 1 or the like is Since there is no need to add a pressure relief valve configuration in addition to the check valve, the number of constituent parts can be minimized and the manufacturing cost can be reduced.

Here, the check valve 1 is an example of a check valve, the valve seat 6 is an example of a valve seat, the valve body 5 is an example of a valve body, the spring 17 is an example of a biasing member, and the valve The packing 18 is an example of a seal member, the holder 12 is an example of a holder member, the pressure introduction hole 26 is an example of a pressure introduction hole, the pressure release hole 24b is an example of a pressure release hole, and the ribs 25 are convex. The guide tube portion 12c is an example of the guide tube portion, the insertion hole 19 is an example of the guide portion, the base portion 12a is an example of the base portion, and the attachment tube portion 12b is an example of the attachment tube portion. The retaining piece 24 is an example of the retaining piece.

Although the embodiments of the present invention have been described in detail above, these are only examples, and the present invention is not to be construed in any limited way by the specific descriptions in such embodiments. It can be implemented in embodiments with various changes, modifications, improvements, etc. based on knowledge, and as long as such embodiments do not depart from the spirit of the present invention, all are within the scope of the present invention. should be understood to be included in the

For example, holder 32 and valve packing 38 according to other embodiments as shown in FIG. 5 may be employed. FIG. 5A is a perspective side view of the holder 32, FIG. 5B is a perspective side view of the valve packing 38, and FIG. be. In the above embodiment, the ribs 25 are provided on the mounting cylinder portion 12b of the holder 12, but the ribs 35 may be integrally provided on the inner peripheral surface 38b of the valve packing 38 like the valve packing 38 shown in FIG. . Since the valve packing 38 is formed of an elastic member such as fluororubber as described above, the adhesion between the rib 35 and the holder 32 is enhanced, and the pressure relief passage can be stably closed in the pressure relief mechanism. can.

Further, although one pressure introduction hole 26 is provided in the above embodiment, two or more pressure introduction holes may be provided. By providing a plurality of pressure introduction holes, even if one pressure introduction hole is clogged due to some trouble, the other pressure introduction holes can act to operate the pressure relief mechanism.

In the above-described embodiment, four pressure relief holes 24b are provided at approximately equal intervals along the outer peripheral surface of the mounting cylinder portion 12b, but the pressure relief holes are not limited to this. As long as the sum of the pore diameter areas is equal to or greater than the pore diameter area of the pressure introducing holes, the number may be one, and the number is not limited to four. good.

Further, in the above embodiment, the cross-shaped depression 24a is provided on the primary side surface of the retainer piece 24, but the depression 24a is not always necessary. good. Furthermore, the shape of the depressed portion 24a is not limited to a cross shape, and may be formed in any suitable shape.

REFERENCE SIGNS LIST 1 Check valve 2 Piping 3 Housing 5 Valve body 6 Valve seat 12 Holder 12 a Base 12 b Mounting cylinder 17 Spring 18 Valve packing 24 Retaining piece 24b...Pressure release hole 25...Rib 26...Pressure introduction hole

Claims (5)

a valve seat formed in a fluid passageway through the primary side and the secondary side;
a valve body that can be seated on the valve seat to close and open the fluid passage;
A check valve comprising an urging member that urges the valve body in a direction in which it is seated on the valve seat,
the valve body is a sealing member formed of an elastic member seated on the valve seat;
and a holder member that holds the seal member with an interference at the primary side end,
The holder member has a pressure introduction hole that receives the pressure from the secondary side of the seal member, and a pressure release hole that communicates with the primary side. provided set above the sum,
Between the pressure introduction hole and the pressure relief hole, either one of the holder member and the seal member protrudes in the opposite direction to a portion where the holder member and the seal member abut. A check valve characterized by having a projection. 3. The convex portion is provided in an annular shape along the inner peripheral surface of the seal member when provided on the holder member, and along the outer peripheral surface of the holder member when provided on the seal member. 1. The check valve according to 1. The holder member is composed of a holder portion that holds the seal member with an interference at the primary side end, and a guide tube portion coaxially extending in the secondary side direction,
3. The fluid passage that communicates with the primary side and the secondary side is provided with a guide portion that allows the guide tube portion to slide along the fluid passage. check valve. The holder member is formed of a rigid member, and the holder portion includes a disc-shaped base portion formed to have substantially the same shape and diameter as the seal member, and a side of the base portion facing the seal member. It is composed of a mounting cylinder portion protruding toward the primary side at the center of the surface of the and into which the sealing member is coaxially inserted, and a retaining piece for retaining the sealing member,
The pressure introduction hole is provided in the mounting cylinder,
4. The check valve according to claim 3, wherein the pressure relief hole is provided in the retaining piece. When the convex portion is provided on the holder member, the convex portion is provided on the mounting cylinder portion. 5. The check valve according to claim 4, wherein the check valve is provided between the retaining piece.

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