JPH0313654Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding support for a constant flow valve that is disposed in a fluid flow path such as a water path and controls fluid flow on and off and adjusts the flow rate.

[Prior Art] Constant flow valves used in conventional water heaters, hot water bolts, water heaters, etc. have a valve case through which fluid flows,
A valve seat through which fluid flows within the valve case is provided through a valve port provided on the inner periphery and a valve seat of the valve port, and opens and closes the valve seat of the valve port by displacement. Consisting of a valve body having a flange-like valve plate and a cylindrical valve body guide that slidably holds the valve body,
The cylindrical valve body guide loosely fits the guided portion of the valve body held by the cylindrical valve body guide when the valve seat of the valve port is opened by the flange-like valve plate of the valve body. and an inner diameter portion into which the guided portion of the valve body is slidably fitted when the valve seat of the valve port is closed with the flange-shaped valve plate of the valve body. is provided through a tapered surface whose inner periphery is constricted toward the downstream side. For this reason, when the conventional constant flow valve is opened, the cylindrical valve body guide loosely fits the guided part of the valve body, so a gap is created between the cylindrical valve body guide and the guided part, and the fluid When the valve passes, the valve body slides due to the turbulence and pressure of the fluid.
There was a problem in that the outer periphery of the guided portion of the valve body and the inner periphery of the cylindrical valve body guide came into contact with each other, resulting in vibration noise of the valve body. In addition, in order to prevent the generation of the vibration noise mentioned above, it has been proposed that an O-ring is fitted around the outer periphery of the guided portion of the valve body, but this
Even in the closed state, the cylindrical valve body guide and the guided part with an O-ring are in constant contact, so that impurities contained in the fluid can be trapped between the cylindrical valve body guide and the guided part during long-term use. It has the disadvantage that it adheres and causes sticking (poor properties).

[Purpose of the invention] The purpose of the invention is to form a cylindrical valve body guide so that it can be displaceably fitted into the guided portion of the valve body when the valve is closed, and to fit loosely when the valve is opened. The purpose of the present invention is to provide a constant flow valve that reduces the sliding resistance of the valve body and prevents vibration noise caused by vibration of the valve body by fitting an O-ring around the outer periphery of the valve body.

[Structure of the invention] In order to achieve the above object, the present invention provides a valve case having a valve case through which fluid flows, and a valve seat that is slidably provided inside the valve case and has a tapered valve seat that widens toward the upstream side. a flange-shaped valve plate having a tapered surface that becomes larger toward the upstream side corresponding to the valve seat of the valve port and a flange-shaped valve plate formed on the outer periphery of the intermediate portion, the downstream edge of which has a smaller diameter than the upstream edge; a valve body having a guided portion formed at its tip; an inner diameter portion into which the guided portion is slidably fitted when the valve body moves downstream; and a valve body having an inner diameter larger than the inner diameter portion; When the body moves to the upstream side, the guided part is connected to the outer diameter part that loosely fits therein by a tapered surface whose inner periphery is retracted toward the downstream side, and is provided coaxially upstream of the valve port. In the constant flow valve comprising a cylindrical valve body guide and a diaphragm having an outer periphery supported downstream of the valve port and an inner periphery fixed to the downstream side of the valve body to displaceably support the valve body, the An O-ring groove is formed on the outer periphery of the guided portion of the valve body, and an O-ring having a portion projecting in the outer circumferential direction from the upstream edge is fitted into the O-ring groove.

[Effects of the invention] The constant flow valve of the invention having the above configuration has the following effects.

(a) When the valve body is located on the upstream side, the valve body vibrates due to the hydraulic pressure and turbulence of the flowing liquid, and the guided part comes into contact with the inner periphery of the outer diameter part of the cylindrical valve body guide. However, the O-ring fitted into the O-ring groove of the guided part absorbs the shock at the time of contact and prevents the generation of contact noise due to vibration.

When the valve body is located on the downstream side, the inner circumference of the inner diameter part of the cylindrical valve body guide is slidably fitted with a guided part fitted with an O-ring to prevent vibration of the valve body and prevent liquid from flowing. Reliably prevent leakage.

Note that even if a closed valve located downstream of the constant flow valve is suddenly opened, the valve opening is displaced downstream and the valve body does not come into contact with the valve seat, thereby preventing water hammer.

(b) By making the downstream edge of the guided part smaller in diameter than the upstream edge, it is possible to prevent the cylindrical valve body guide from sticking to the guided part due to impurities.

(c) By fitting the O-ring into the O-ring groove on the outer periphery of the guided part, the tolerance range of dimensions between the inner circumference of the small diameter part of the cylindrical valve body guide and the upstream side of the guided part is reduced. can be made large, and the dimensions of the inner periphery of the small diameter portion of the cylindrical valve body guide and the outer periphery of the upstream edge of the guided portion can be easily controlled.

[Example] Next, a constant flow valve of the present invention will be explained based on an example shown in the drawings.

Reference numeral 1 denotes a fluid control valve installed on the water supply inlet side of a gas water heater.It is enclosed in a cylindrical valve case 2, and the inside is disposed on the upstream side (lower side in the figure), and is used to support the constant flow valve of the present invention. A constant flow valve 3 to which the mechanism is applied,
It consists of a flow rate control valve 4 arranged on the downstream side (upper side in the figure), and the upstream side of the valve case 2 has a drain hole 51, and further upstream side is equipped with a waterway opening/closing valve (not shown) that cuts off and on the water supply. The inflow pipe 5 is connected via a packing 52 made of rubber, and the outflow pipe 6, which flows out to a heat exchanger (not shown) that exchanges heat with a flame of water and gas on the downstream side, is connected via a packing 52. There is.

The valve case 2 includes a constant flow valve guided portion 21 having a large diameter to accommodate the constant flow valve 3 and a small diameter flow control valve guided portion 22 containing the constant flow valve 3.

The constant flow valve 3 is disposed within the constant flow valve guided portion 21 of the valve case 2, and the fluid flows through the inner peripheral portion.
A tapered valve seat 301 that widens toward the upstream side
A valve port 302 is provided with a valve port 302, and a valve port 302 is provided to penetrate into the valve seat 301 of the valve port 302, and a valve port 302 facing the upstream side opens and closes the valve seat 301 of the valve port 302 by moving in the fluid flow direction. Flange-shaped valve plate 30 provided with a valve seat 311 with a tapered surface that has a large diameter
3, and a valve body guide support part 306 having a cylindrical valve body guide 305 disposed coaxially on the upstream side of the valve body 304 and displaceably holding the valve body 304. The spring 307 that presses the valve body 304 toward the upstream side and the spring 308 that presses the valve body 304 toward the downstream side cause the valve port 30 to
The valve body 30 is
Move 4.

The valve port 302 has a spring seat 312 that supports one side of the spring 308, and is slidably arranged within the inner diameter of the constant flow valve guided portion 21 of the valve case 2.
The upstream side is a snap spring 313, the downstream side is a spring plate 314 curved in the inner circumferential direction, and the spring plate 314
It is supported by an O-ring 315 that comes into contact with the.

The valve body guide support portion 306 is connected to the above-mentioned cylindrical valve body guide 305 that is fastened to the upstream side of the valve port 302 and slidably holds the guided portion 316 provided on the upstream side of the valve body 304. , and a flow hole 317 for supplying water upstream of the valve port 302, and the cylindrical valve body guide 305 can freely slide on the guided portion 316 of the valve body 304 when the valve body 304 moves downstream. The inner diameter portion 318 that fits inside and the guided portion 316 of the valve body 304 when the valve body 304 is moved to the upstream side.
An outer diameter portion 319 into which the inner circumference is loosely fitted is provided through a tapered surface 320 whose inner periphery is constricted toward the downstream side.

The valve body 304 has a governor valve body flow passage 321 in which the upstream side and the downstream side communicate with each other.
The upstream side of the governor valve body inflow passage 321 opens into the cylindrical valve body guide 305 of the valve body guide support portion 306, and the valve body inflow hole 322 is provided in the downstream body of the flange-shaped valve plate 303. A valve body discharge port 323 is provided on the downstream side for discharging the fluid that has flowed in from the valve body inflow hole 322, and a circle forming the flow port 401 of the flow rate control valve 4 is provided on the downstream end face of the valve body discharge port 323. An annular plate 402 is disposed and is sandwiched between spring fittings 325 and 326 that support one end of the springs 307 and 308 together with the downstream end 324 of the valve body 304. Cylindrical valve body guide 30
When the valve body 304 moves downstream, the inner diameter part 31 of the cylindrical valve body guide 305 is attached to the outer periphery of the guided portion 316 of the valve body 304 that is slidably held by the valve body 5.
O-ring 32 that has slight sliding resistance with the inner peripheral surface of 8
An O-ring groove 327a for externally fitting the O-ring 327 is provided, and consists of a downstream edge 328 and an upstream edge 329 that support the O-ring 327, and the downstream edge 328 is provided with a smaller diameter than the upstream edge 329. The outer circumferential surface of the downstream edge 328 is formed to be inclined in accordance with the inclined surface of the tapered surface 320 of the cylindrical valve body guide 305.

330 is a diaphragm made of rubber that prevents the flow of fluid on the outer periphery of the flow port, and the inner periphery is surrounded by an annular plate 4.
02 and is firmly fixed by being sandwiched between spring fittings 325 and 326, and the outer periphery is sandwiched and attached between the claw portion 331 of the valve port 302 and the spring plate 314.

The flow rate control valve 4 includes an annular plate 402 forming the flow port 401, a temperature detection element 403 that expands and contracts with changes in water temperature, and a flow rate control valve whose downstream end of the temperature detection element 403 is a fluid flow path. a fixing member 404 fixed within the guided portion 22; and a fixing member 404 connected to the downstream end of the temperature sensing element 403;
It consists of a flow rate variable member 405 that slides within the flow port 401 and changes the opening area of the flow port 401.

In this embodiment, the temperature detection element 403 is a wax thermometer, and includes a body part 406 containing wax with a large coefficient of thermal expansion, an operating shaft 407 that expands and contracts in response to the expansion and contraction of the wax, a lid part 408, and a body part 406 on the downstream side of the body part 406. It consists of a male screw 409 provided in a protruding manner.

The fixing member 404 has a communication hole 410 through which fluid flows on the upstream side, and the operating shaft fixing member 41 on the upstream side.
an upstream holding section 412 having a cylindrical shape that fixes the operating shaft 407 of the temperature sensing element 403 through the
and a downstream side holding part 415 which has a circulation hole 413 through which fluid flows on the downstream side and is provided with a sliding holding part 414 which slidably holds the body part 406 of the temperature sensing element 403 in the center part. There is a lid part 408 between the lid part 408 of the temperature sensing element 403 and the outer periphery of the sliding holding part 414 of the downstream holding part 415.
A spring 416 that presses the valve body 304 in the upstream direction is disposed, and a downstream support member 4 that supports one end of the spring 307 that presses the valve body 304 in the upstream direction is disposed on the upstream side.
17. The downstream side is supported inside the flow control valve guided portion 22 by a snap spring 418.

The variable flow rate member 405 includes a variable flow rate valve body 419 formed in a needle shape that moves within the flow port 401 by the operation of the temperature detection element 403, and a valve body support member 420 that supports the variable flow rate valve body 419. , the valve body support member 420 has a female thread 4 on the downstream side that matches the male thread 409 of the temperature sensing element 403.
21, and together with the nut 422, the flow rate variable member 4
05 is adjusted and fixed to the temperature sensing element 403. Further, the valve body support member 420 has a substantially U-shape passing through the communication holes 410 and 413 in order to support the variable flow rate valve body 419 on the upstream side of the temperature sensing element 403.

The operation of the fluid control valve 1 having the above configuration will be explained.

In the constant flow valve 3, when the supplied water pressure on the upstream side is high, the water pressure in the primary pressure chamber 309 becomes higher than that in the secondary pressure chamber 310, and springs 307 and 308 press the valve body 304 toward the upstream side and the downstream side. The water pressure difference is balanced, the valve body 304 is moved downstream, and the valve port 30
2, the flange-shaped valve plate 3 of the valve seat 301 and the valve body 304
03 is narrowed to reduce the degree of opening, and when the supplied water pressure on the upstream side is low, the water pressure in the primary pressure chamber 309 is lower than that in the secondary pressure chamber 310, and the valve body 304
is moved to the upstream side, the valve seat 301 of the valve port 302 and the flange-shaped valve plate 303 of the valve body 304 are expanded to increase the opening degree, adjust the opening degree, and keep the water pressure in the secondary pressure chamber 310 constant. Keep it.

When the valve body 304 is located on the upstream side, the valve body 304
vibrates due to the pressure and turbulence of the flowing water,
The guided portion 316 of the valve body 304 comes into contact with the inner periphery of the outer diameter portion 319 of the cylindrical valve body guide 305, but the O-ring 327 fitted onto the guided portion 316 absorbs the impact at the time of contact. to prevent contact noise caused by vibration.

When the valve body 304 moves from the upstream side to the downstream side,
The downstream edge 328 of the guided portion 316 is the upstream edge 329
The valve body 3 is provided with a smaller diameter and the outer peripheral surface of the downstream edge 328 forms an inclination corresponding to the slope of the tapered surface 320 of the cylindrical valve body guide 305.
04 moves smoothly and reliably.

When the valve body 304 is located on the downstream side, the guided portion 316 on which the O-ring 327 is fitted is slidably fitted inside the inner diameter portion 318 of the cylindrical valve body guide 305, and In order to reliably prevent vibration, fluid does not flow out due to vibration of the valve body 304 when the valve is closed.

When the temperature of the inflowing water is low, the flow rate control valve 4 contracts as the wax of the temperature sensing element 403 is cooled by the inflowing water, and the actuating shaft 407 contracts, causing the body 406 to become a sliding holding part. 414 to the upstream side, and the valve support member 420 moves to the upstream side.
19 enters the flow port 401 and the variable flow rate valve body 41
By narrowing the gap between 9 and 9 to reduce the amount of water flowing,
When the temperature of the inflowing water is high, the temperature detection element 40
Wax in the body 4 is heated by the inflowing water and expands, and the operating shaft 407 is extended.
06 moves downstream within the sliding holding part 414, and the valve body support member 420 moves downstream, so the variable flow rate valve body 419 inside the flow port 401 retreats and the flow rate variable valve body 419 moves between the flow rate variable valve body 401 and the flow rate variable valve body. 419 and increase the amount of water flowing.

In the above embodiment, the constant flow valve of the present invention was applied to the constant flow valve 3 combined with the flow control valve 4, but it can be applied to all other constant flow valves that open, close, and adjust fluid.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the constant flow valve of the present invention. In the figure, 2...valve case, 301...valve seat, 302...
Valve port, 303...flange-shaped valve plate, 304...valve body,
305... Cylindrical valve body guide, 316... Guided part,
318...Inner diameter part, 319...Outer diameter part, 320...Tapered surface, 327...O ring, 327a...O ring groove, 330...Diaphragm.

Claims (1)

[Claims for Utility Model Registration] 1. When fluid flows, a valve case, a valve port that is slidably provided inside the valve case and has a tapered valve seat that widens toward the upstream side; A flange-shaped valve plate with a tapered surface that increases in diameter toward the upstream side corresponding to the valve seat is formed on the outer periphery of the intermediate portion, and a flange-shaped guided portion with the downstream edge having a smaller diameter than the upstream edge is formed at the tip. an inner diameter part into which the guided portion is slidably fitted when the valve element moves downstream; and an inner diameter part that is formed to have an inner diameter larger than the inner diameter part, and the valve element moves upstream. a cylindrical valve body guide provided coaxially upstream of the valve port and connected to an outer diameter part into which the guided part is loosely fitted, by a tapered surface that faces downstream and has a retracted inner periphery; A constant flow valve comprising a diaphragm having an outer periphery supported downstream of the valve port and a diaphragm having an inner periphery fixed to the downstream side of the valve body to displaceably support the valve body, the guided portion of the valve body comprising: 1. A constant flow valve, characterized in that an O-ring groove is formed on the outer periphery, and an O-ring having a portion projecting in the outer circumferential direction from the upstream edge is fitted into the O-ring groove. 2. The constant flow valve according to claim 1, wherein the downstream edge is formed with an inclined surface corresponding to the tapered surface of the valve body guide.