JP2013108577A - Intake and exhaust valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance assemblability and simultaneously prevent chips from being produced by friction of parts in an intake and exhaust valve configured to prevent breakage due to volumetric expansion of frozen water.SOLUTION: A float valve 120 is inserted in a valve chamber 113 of a valve element 100 and a seat unit 130 is vertically slidably inserted in its upward direction. An internal thread portion 144 of a lid member 140 is threadably engaged with an external thread portion 118 of the valve element 100. A spring receiving member 160 which receives upper end of a coil spring 150 urging the seat unit 130 downward is provided and a pushing rod 210 of a tool 200 for rotation operation is inserted into a through hole 146 of the lid member 140 and the lid member 140 is threadably engaged with the valve body 110 by rotating a tool 230 for pressing operation in such a condition as to compress the coil spring 150.

Description

  The present invention relates to an intake / exhaust valve provided in a water supply pipe.

Patent Document 1 below discloses an intake / exhaust valve provided in a water supply pipe.
This intake / exhaust valve is provided at the top of the water supply pipe to exhaust the air in the water supply pipe to the outside during water supply and to prevent the water in the water supply pipe from leaking to the outside. It is configured to smoothly drain water by introducing air.

  This type of intake / exhaust valve includes a float valve for preventing leakage of water. This float valve is made of a material having a specific gravity smaller than that of water, and is accommodated in a valve chamber formed in the valve body so as to be vertically displaceable. When the water level in the valve chamber rises, the float valve rises and abuts the tapered seat around the valve port communicating with the intake / exhaust port to close the valve port. In addition, in order to improve the sealing performance of the valve port, there is also a type in which the seat is formed of an elastic material such as rubber and the valve port is closed while the seat is slightly compressed by a float valve.

  When the water level in the valve chamber decreases, the float valve descends away from the valve port and sits on a valve seat provided below the valve chamber. The valve seat on which the float valve is seated is provided with a drainage groove, and the water in the valve chamber is drained into the water supply pipe through the drainage groove. As a result, outside air is taken into the water supply pipe from the intake / exhaust hole via the valve chamber, and this outside air flows into the water supply pipe and the water in the water supply pipe is drained to the outside.

Japanese Utility Model Publication No. 55-22592

  In general, when water freezes, volume expansion of about 9% occurs, and in the case of a sealed space, the weakest part is destroyed by the pressure of the volume-expanded water. In view of this, an intake / exhaust valve that solves such a problem has been proposed.

FIG. 10 is a cross-sectional view showing an example of this type of intake / exhaust valve.
The intake / exhaust valve 1 has a valve body 10, and the valve body 10 is formed with a water supply / drain port 12 and a valve chamber 13 communicating therewith. A tapered valve seat 14 is provided between the water supply / drain port 12 and the valve chamber 13, and a spherical float valve 20 is disposed in the valve chamber 13.

  The float valve 20 is formed of a plastic material having a specific gravity of about 0.8, such as polypropylene (PP), and floats on the water when the water is supplied into the valve chamber 13, and sits on the valve seat 14 when the water is not supplied. An external thread portion 18 is provided on the upper portion of the valve body 10 and the lid member 40 is screwed together. The lid member 40 is formed with an intake / exhaust hole 42 communicating with the valve chamber 13 and opened to the outside air.

  A seat unit 30 is slidably inserted in the upper part of the valve chamber 13. The seat unit 30 has a seat member 32 at a position facing the float valve 20. The seat member 32 is an annular seal member made of an elastic material such as rubber, and a float valve contact portion 34 is formed at a position where the seat member 32 contacts the float valve 20. An O-ring 36 that seals a gap between the seat unit 30 and the inner peripheral surface of the valve body 10 is mounted on the outer peripheral portion of the seat unit 30.

  The lid member 40 has an internal thread portion 44 that is screwed into the external thread portion 18 of the valve body 10. A coil spring 50 is disposed between the lid member 40 and the sheet unit 30. The coil spring 50 has a large spring constant and presses the seat unit 30 toward the float valve 20 with a set pressure.

When assembling the intake / exhaust valve 1, a process of gripping the lid member 40 with an appropriate tool and screwing the inner thread portion 44 of the lid member 40 into the outer thread portion 18 of the valve body 10 is required. This step is performed while compressing the coil spring 50 with the lid member 40. However, since the spring constant of the coil spring 50 is large, the torque required for this screwing also increases, the assemblability is not good, and the lid member 40 tilts and the screw Problems such as galling are likely to occur. Further, since the lower end portion 52 of the coil spring 50 and the upper surface of the sheet unit 30 and the upper end portion 54 of the coil spring 50 and the inner surface of the top wall of the lid member 40 rub against each other while rotating relatively, metal chips and the like are likely to be generated. If the chips are present in the intake / exhaust valve 1, it causes a malfunction of the intake / exhaust valve 1.
Therefore, an object of the present invention is to provide an intake / exhaust valve that solves the above-described problems.

  In order to achieve the above object, the intake / exhaust valve of the present invention is provided in a water supply pipe, and at the time of water supply, the air in the water supply pipe is exhausted to the outside and the water in the water supply pipe is prevented from leaking to the outside. An intake / exhaust valve that drains water by introducing air into the water supply pipe from the outside when draining water, and is disposed in the valve chamber having a valve chamber and a water supply / drain port provided at the lower end thereof A float valve, a seat unit that is slidably inserted into the valve body up and down and is in contact with and away from the float valve, a lid member that is screwed onto an upper portion of the valve body, the lid member and the seat A spring that is disposed between the cover unit and urges the seat unit downward, and a spring receiving member that is disposed between the cover member and the spring so as to be movable up and down. Tool for pressing operation from outside the member The spring receiving member is separated from the inner surface of the lid member by being inserted into the lid member and pressing the spring receiving member downward, and the lid member is attached to and detached from the valve body in this state. It is characterized by that.

  In addition, the said spring receiving member shall have a fitting part slidably fitted to the through-hole formed in the said cover member.

  In the assembling process, the intake / exhaust valve of the present invention can screw the lid member onto the valve body in a state where no spring force acts on the lid member. Thereby, generation | occurrence | production of the chip | tip etc. by a spring slidingly contacting with a cover member or a sheet | seat unit can be prevented, and the malfunction of an intake / exhaust valve, the galling of the screw at the time of an assembly, etc. can be avoided.

Further, when the spring receiving member has a fitting portion that is slidably fitted into a through hole formed in the lid member, the spring receiving member can be prevented from being displaced and the spring can be prevented from being inclined. So reliability is improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of 1st Example of this invention, (a) is front sectional drawing, (b) is a top view, (c) is a bottom view. Sectional drawing which shows the decomposition | disassembly state of 1st Example of this invention. Explanatory drawing of an effect | action of 1st Example of this invention. Explanatory drawing of the assembly process of 1st Example of this invention. Explanatory drawing of the assembly process of 1st Example of this invention. Explanatory drawing of the assembly process of 1st Example of this invention. Explanatory drawing of the assembly process of 2nd Example of this invention. Explanatory drawing of the assembly process of 2nd Example of this invention. Explanatory drawing of the assembly process of 2nd Example of this invention. Sectional drawing of the conventional intake / exhaust valve.

FIG. 1 is a diagram showing the overall configuration of a first embodiment of the present invention, where (a) is a front sectional view, (b) is a plan view, (c) is a bottom view, and FIG. 2 is an intake / exhaust valve of FIG. It is sectional drawing which shows the decomposition | disassembly state of.
The intake / exhaust valve 100 includes a tubular valve body 110. The valve main body 110 has a hexagonal surface 111 for engaging with a spanner, a water supply / drain port 112 provided at the lower end, and a valve chamber 113 communicating with the water supply / drain port 112. The water supply / drain port 112 has a threaded portion 112a for attaching a pipe to the outer peripheral portion. A tapered valve seat 114 is formed between the water supply / drain port 112 and the valve chamber 113, and a drainage groove 116 is provided in the valve seat 114. A float valve 120 is accommodated in the valve chamber 113. Above the float valve 120, a seat unit 130 is inserted into the valve body 110 so as to be slidable in the vertical direction. An O-ring 136 that seals a gap between the seat unit 130 and the inner peripheral surface of the valve body 10 is attached to the outer peripheral portion of the seat unit 130. The seat unit 130 has a seat member 132 at a position facing the float valve 120. The seat member 132 is an annular seal member made of an elastic material such as rubber, and a float valve contact portion 134 is formed at a position where it abuts on the float valve 120.

  A cylindrical lid member 140 with a ceiling is detachably screwed onto the upper portion of the valve body 110. The lid member 140 has an intake / exhaust hole 142 on the side wall and a through hole 146 in the center of the top wall. In addition, bottomed holes 148 into which pins of a rotation operation tool described later are inserted are formed on the left and right sides of the through hole 146. A coil spring 150 that biases the seat unit 130 downward is provided between the top wall of the lid member 140 and the seat unit 130, and a dish-like shape is provided between the upper end 154 of the coil spring 150 and the top wall of the lid member 140. The spring receiving member 160 is inserted movably up and down. A spring fitting portion 162 into which the upper end portion 154 of the coil spring 150 is fitted is provided on the lower surface of the spring receiving member 160. A lower end 152 of the coil spring 150 is fitted in a recess 138 formed in the sheet unit 130.

In this intake and exhaust valves 100, when the volume inside the water is frozen is inflated, as shown in FIG. 3, the sheet unit 130 with the float valve 120 is raised by a distance L ₁ is pushed up against the coil spring 150 . By this action, the stress exerted on each component by the volume-expanded water is relieved, so that the intake / exhaust valve 100 is prevented from being damaged. When the freezing of water is eliminated, the seat unit 130 returns to the steady position shown in FIG.

4 to 6 are explanatory views showing an assembly process of the intake / exhaust valve 100.
FIG. 4 shows an initial process of assembling the intake / exhaust valve 100.
Two types of tools are used for assembly. The pressing operation tool 200 is a tool that is mounted on a press or the like and moves up and down, and includes a pressing bar 210. The rotation operation tool 230 is a tool for rotating the lid member 140 and includes a through hole 232 and two implantation pins 234.

  FIG. 4 shows a state in which the rotary operation tool 230 is fitted on the top of the lid member 140, and shows a state in which each implantation pin 234 of the rotary operation tool 230 is inserted into the bottomed hole 148 of the lid member 140. In this state, the inner screw portion 144 of the lid member 140 and the outer screw portion 118 of the valve body 110 are not yet screwed together.

  In FIG. 5, the pressing operation tool 200 is lowered, and the pressing rod 210 is inserted into the lid member 140 through the through hole 232 of the rotation operation tool 230 and the through hole 146 of the lid member 140, and the spring receiving member 160 is inserted. The state pressed downward is shown. The coil spring 150 is compressed by the pressing rod 210 of the pressing operation tool 200 via the spring receiving member 160, and the spring receiving member 160 is separated from the top wall of the lid member 140.

  FIG. 6 shows a step of rotating the rotary operation tool 230 while keeping the state of FIG. 5 and screwing the inner screw portion 144 of the lid member 140 into the outer screw portion 118 of the valve body 110. Since the coil spring 150 is compressed via the spring receiving member 160 and the spring receiving member 160 is separated from the top wall of the lid member 140, no spring force acts on the lid member 140, and the spring receiving member 160 is not covered by the lid member 140. It does not slide against. Therefore, the lid member 140 can be screwed smoothly without tilting with respect to the valve body 110. Further, since the coil spring 150 does not rotate during this screwing operation, the coil spring 150 does not slide with respect to the seat unit 130. Therefore, generation | occurrence | production of a chip can be prevented and the malfunctioning of the intake / exhaust valve 100 resulting from a chip can be prevented.

  Further, in the present embodiment, the rotary operation tool 230 for rotating the lid member 140 is formed so as to be detachable in the vertical direction with respect to the lid member 140, and the pressing operation tool 200 is disposed from above the lid member 140. Since it is configured to be inserted into the lid member 140, the rotation operation tool 200 and the pressing operation tool 200 can be brought into contact with and separated from the intake / exhaust valve 100 in one direction, so that workability is good. It is.

Next, a second embodiment of the present invention will be described. 7 to 9 are explanatory views showing an assembling process of the intake / exhaust valve 100 'of the second embodiment. In the present embodiment, parts corresponding to those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, the spring receiving member 160 ′ has a positioning fitting portion 164 that protrudes upward. The fitting portion 164 is formed so as to be slidable in the vertical direction and detachable with respect to the through hole 146 of the lid member 140. Other configurations of the present embodiment are the same as those of the first embodiment.

  From the state shown in FIG. 7, the pressing rod 210 of the pressing operation tool 200 is inserted into the lid member 140 through the through hole 232 of the rotary operation tool 230 and the through hole 146 of the lid member 140, as shown in FIG. The spring receiving member 160 ′ is pressed downward to be separated from the inner surface of the top wall of the lid member 140.

  When the lid member 140 is screwed to the valve body 110 in this state, the fitting portion 164 of the spring receiving member 160 ′ enters the through hole 146 as shown in FIG. 9. In this state, the spring receiving member 160 is regulated in the radial direction with respect to the lid member 140. Further, the upper end portion 154 of the coil spring 154 is fitted in the spring fitting portion 162 of the spring receiving member 160 and is regulated in the radial direction. Therefore, the coil spring 154 does not tilt, and malfunction can be prevented and reliability can be improved. It can be confirmed that the positioning fitting portion 164 is fitted into the through hole 146 from the outside of the lid member 140.

  Although specific embodiments of the present invention have been described with reference to FIGS. 1 to 9, the present invention is not limited to the above-described embodiments, and the above-described embodiments are within the scope of the present invention. Various modifications can be made to each embodiment.

100, 100 ′ Intake / exhaust valve 110 Valve body 112 Water supply / drain port 113 Valve chamber 114 Seat 120 Float valve 130 Seat unit 140 Lid member
150 Coil springs 160, 160 ′ Spring receiving member 164 Fitting portion 200 Tool for rotating operation 230 Tool for pressing operation

Claims (2)

It is provided in the water supply pipe and exhausts the air in the water supply pipe to the outside during water supply and prevents the water in the water supply pipe from leaking to the outside, and introduces air from the outside into the water supply pipe when draining water. Intake and exhaust valves for draining water,
A valve body having a valve chamber and a water supply / drain port provided at a lower end thereof; a float valve disposed in the valve chamber; and a seat unit that is inserted into the valve body so as to be movable up and down and is in contact with the float valve. A lid member screwed onto the upper portion of the valve body, a spring disposed between the lid member and the seat unit and biasing the seat unit downward, the lid member and the spring A spring receiving member that is movably disposed up and down between
By inserting a pressing operation tool from the outside of the lid member into the lid member and pressing the spring receiving member downward, the spring receiving member is separated from the inner surface of the lid member, and in this state the lid An intake / exhaust valve characterized in that a member is attached to and detached from the valve body.   The intake / exhaust valve according to claim 1, wherein the spring receiving member has a fitting portion slidably fitted into a through hole formed in the lid member.

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