JP2004278582A - Constant flow valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stable constant flow valve preventing generation of noise even when controlling in a region of a small flow rate. <P>SOLUTION: A plurality of throttle grooves (valve parts) 16A and 16B which sequentially operates in accordance with water pressure and are different in opening area are arranged between a valve disc 12 and a support member 13 elastically supporting the valve disc 12. Accordingly, a change in the opening area is made large, thereby not only enhancing a startup characteristic which is important as the constant flow valve but also making an initial pressure of a water line high. Even when a throttling is required to be set considerably small, the stable flow control preventing generation of the noise can be realized by a plurality of valve parts. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a constant flow valve in a device such as a hot water flush toilet seat that is used in direct connection with a water supply source, and is particularly suitable for a flow setting with a small constant flow characteristic.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in equipment used in direct connection with a water supply source such as a hot water flush toilet seat, a constant flow valve is incorporated in order to suppress a change in a discharge flow rate due to a change in a source pressure of the water supply source (for example, see Patent Document 1).
[0003]
As shown in FIGS. 11 and 12, the constant flow valve includes a vessel-shaped valve body 1, a support member 2 in contact with the valve body 1, and a spring 3 inserted between the valve body 1 and the support member 2. Mainly consisting of A throttle flow path is formed by a slit 4 on the side wall of the valve element 1, and the area of the slit 4 is gradually changed by the fluid pressure so that a constant flow characteristic can be obtained. That is, since the throttle channel formed by the slit 4 is set to operate in a region having a large area at the time of low-pressure operation and a small area at the time of high-pressure operation, the channel area is reduced in response to a rise in fluid pressure, and The flow rate change due to the pressure fluctuation was suppressed, and the constant flow rate characteristics were exhibited.
[0004]
[Patent Document 1]
Japanese Utility Model Registration No. 2596767
[Problems to be solved by the invention]
However, the conventional constant flow valve has a simple configuration and a small shape, and is widely used for the purpose of simple flow control. However, when the source pressure of the water supply source is 0.75 MPa and the flow rate is 1. In the case where the flow rate is controlled to 5 L / min or less, that is, when the flow rate is controlled in a region where the flow rate is extremely small, the gap through which the fluid passes needs to be controlled on the order of about 0.1 mm. It is difficult to guarantee the accuracy on the order, and there is a problem that the flow rate varies widely. When the original pressure is 0.75 MPa and the flow rate is reduced to 1.5 L / min or less, the throttle amount becomes very large, and a fluid unstable phenomenon such as cavitation is likely to occur in the throttle portion, and water flow noise occurs. There were challenges.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a constant flow valve which is stable and does not generate noise even when the flow rate is controlled in a region where the flow rate is extremely small.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned conventional problems, a constant flow valve according to the present invention is provided with a plurality of valve portions that sequentially operate according to water pressure between a valve body and a support member that elastically supports the valve body.
[0008]
As a result, a large change in the opening area can be obtained, and not only can the rising characteristic important as a constant flow valve be improved, but also when the original pressure of the water supply becomes high and the throttle needs to be set very small, With the plurality of valve parts, it is possible to control the flow rate stably and without generating noise.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 is a pipe provided in a device and connected to a water supply source, a bottomed cylindrical valve body having a predetermined gap with respect to an inner diameter of the pipe, and a downstream side of the valve body. Elastically supporting the end face of the valve body, and a supporting member having a flow path near the center, the valve body being a constant flow valve formed with a plurality of throttle grooves having different opening areas on the end face side, A large change in the opening area can be taken by a plurality of throttle grooves having different opening areas, not only can the rising characteristics important as a constant flow valve be improved, but also the source pressure of the water becomes high, and the throttle is set very small. Even when it is necessary, a plurality of throttle grooves can control the flow rate stably and without generating noise.
[0010]
The invention according to claim 2 is a pipe provided in the apparatus and connected to a water supply source, a bottomed cylindrical valve body having a predetermined gap with respect to an inner diameter of the pipe, and a downstream side of the valve body. A support member elastically supporting an end face of the valve body and having a flow path near the center, wherein the valve body has a throttle groove formed on the end face side thereof, and the valve member faces the flow path of the support member. With the constant flow valve provided with the valve, the opening area can be greatly changed by the throttle groove on the end face side of the valve body and the valve portion by the valve section facing the flow path, and the important startup characteristics as a constant flow valve can be obtained. Not only can it be improved, but even if the source pressure of the water supply is high and the throttle needs to be set very small, it is possible to control the flow rate stably and without noise by using multiple valve parts It is.
[0011]
The invention according to claim 3 is a pipe provided in the equipment and connected to a water supply source, a cylindrical valve body with a bottom having a predetermined gap with respect to an inner diameter of the pipe, and a downstream side of the valve body. Elastically supporting the valve body, and a supporting member having a flow path near the center, the valve body has a tapered surface at the bottom and forms a throttle groove from the center to the outer periphery of the tapered surface, The support member is a constant flow valve provided with a plurality of steps that support the tapered surface of the valve body, so that a large change in the opening area can be obtained at the valve portion due to the throttle groove and the plurality of steps of the valve body, Not only can it improve the startup characteristics that are important as a constant flow valve, but also when the original pressure of the water is high and it is necessary to set the throttle very small, the multiple valve parts are stable and generate noise. It is possible to control the flow rate without any problem. In particular, since the valve element is elastically supported by a plurality of steps, the displacement with respect to the pressure is large, the control width of the throttle can be set large, and the flow rate can be controlled to be constant over a wide pressure range.
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
(Example 1)
1 to 4 show a constant flow valve according to a first embodiment of the present invention.
[0014]
In the figure, reference numeral 10 denotes a water supply source, and 11 denotes a pipe connected to the water supply source 10, which is built in a device such as a hot water flush toilet seat. A cylindrical valve body 12 with a bottom having a predetermined gap with respect to the inner diameter of the pipe 11 is inserted into the pipe 11, and a rubber downstream of the valve body 12 elastically supports an end surface of the valve body 12. A support member 13 formed of an elastic body such as the above is disposed. The support member 13 has a flow path 14 near the center, and is fixed in the pipe 11 by a fixing portion 15 provided in the pipe 11. Then, throttle grooves 16A and 16B are provided at the end face side of the valve body 12, that is, at a position where it comes into contact with the support member 13. The aperture groove 16A has a large opening area, and the aperture groove 16B has a small opening area. In other words, the valve body 12 has a plurality of valve portions that sequentially operate according to water pressure formed by the throttle grooves 16A and 16B having different opening areas and the support member 13 on the end face side.
[0015]
The operation and operation of the constant flow valve configured as described above will be described below.
[0016]
First, the water supplied from the water supply source 10 passes through the gap between the pipe 11 and the valve body 12, and further has a throttle groove 16 </ b> A having a large opening area provided on the end face side where the valve body 12 and the support member 13 are in contact. It passes through the throttle groove 16 </ b> B having a small area and reaches the pipe 11 from the flow path 14. When the pressure of the water supply source 10 increases, the fluid pressure acting on the valve body 12 increases, so that the force with which the valve body 12 presses against the support member 13 increases, and the support member 13 elastically deforms and a part of the support member 13. However, the gas enters the throttle grooves 16A and 16B of the valve body 12, and the flow passage area of the throttle grooves 16A and 16B decreases. The throttle groove 16A having a large opening area is greatly affected by the deformation of the support member 13 due to the pressure of the fluid, and the flow path area of the throttle groove 16A sharply decreases as the flow path pressure increases. On the other hand, as the flow path pressure increases, the flow path area of the throttle groove 16B having a small opening area gradually decreases. Therefore, when the tap water pressure is low, the flow rate is controlled to be constant at the throttle groove 16A having a large opening area, and when the tap water pressure is high, the flow rate is constant at the throttle groove 16B having a small opening area. Is controlled as follows.
[0017]
As described above, by providing the throttle grooves 16A and 16B which operate the throttle function of the constant flow valve in a range where the source pressure is low and a range where the source pressure is high, the flow control is performed such that the flow rate becomes stable over a wide range of the source pressure. Is made possible.
[0018]
(Example 2)
5 to 7 show a constant flow valve according to a second embodiment of the present invention. Since the basic configuration of the constant flow valve is the same as that of the first embodiment, only the differences will be described.
[0019]
In this embodiment, the bottomed cylindrical valve body 17 has a throttle groove 18 formed on the end face side thereof, and a valve member 19 of a poppet valve protrudingly formed inside the valve body 17 in opposition to the flow path 14 of the support member 13. It was done. That is, the valve element 17 is formed by the throttle groove 18, the valve member 19, and the support member 13 to form a plurality of valve portions that sequentially operate according to the water pressure. Other configurations are the same as in the first embodiment.
[0020]
The operation and operation of the constant flow valve configured as described above will be described below. First, the water supplied from the water supply source 10 passes through the gap between the pipe 11 and the valve body 17, further passes through the throttle groove 18 of the valve body 17, and passes through the throttle valve portion formed by the valve member 19 and the flow path 14. And flows out of the flow path 14.
[0021]
When the pressure of the water supply source 10 is low, the throttle is performed by the throttle groove 18, and when the pressure is high, the throttle is also performed at the throttle valve portion formed by the valve member 19 and the flow path 14 so that the flow rate is constant. Control.
[0022]
As described above, the throttle formed by the valve member 19 and the flow path 14 and the throttle groove 18 are set so as to increase the throttle effect in two stages. Characteristics can be exhibited.
[0023]
(Example 3)
8 to 10 show a constant flow valve according to a third embodiment of the present invention. Since the basic configuration of the constant flow valve is the same as in the first and second embodiments, only the differences will be described.
[0024]
In the present embodiment, the bottomed cylindrical valve body 20 has a tapered surface on the outer bottom surface and a throttle groove 21 formed in the tapered surface from the center to the outer periphery. The support member 22 that elastically supports the tapered surface of the valve element 20 on the downstream side of the valve element 20 has a recess around the flow path 23 to form a plurality of steps 22A and 22B. The tapered surface of the valve element 20 and the steps 22A and 22B are configured such that the valve element 20 first contacts the step 22A, and then the valve element 20 contacts the step 22B. In other words, the valve body 20 has a plurality of valve portions that sequentially operate according to the water pressure by the throttle groove 21 and the steps 22A and 22B of the support member 13. Other configurations are the same as those of the first and second embodiments.
[0025]
The operation and operation of the constant flow valve configured as described above will be described below. First, the water supplied from the water supply source 10 passes through a gap between the pipe 11 and the valve body 20, passes through a throttle formed by the valve body 20 and the steps 22 </ b> A and 22 </ b> B, and is provided near the center of the support member 22. It flows out of the flow path 23 into the pipe 11.
[0026]
When the pressure of the water supply source 10 increases, the fluid pressure acting on the valve body 20 increases, so that the force with which the valve body 20 presses against the support member 22 increases. First, the valve body 20 and the step 22A press against each other. Then, the fluid is throttled by the throttle groove 21 formed in the valve body 20 at the position of the step 22A, and the fluid passes therethrough. When the pressure further increases, the valve body 20 also comes into contact with the step 22B, and the valve is controlled by the throttle groove 21 formed in the valve body 20 at the position of the step 22B so that the flow rate is constant.
[0027]
As described above, since the valve element 20 is elastically supported by the steps 22A and 22B, the displacement with respect to the pressure is large, the control width of the throttle can be set large, and the flow rate can be controlled to be constant over a wide pressure range.
[0028]
In the present embodiment, a configuration example in which two steps are used as the steps is shown. However, it is easy to increase the number of steps, and it is possible to cope with a case where the pressure difference is large.
[0029]
【The invention's effect】
As described above, according to the constant flow valve of the present invention, between the valve element and the supporting member that elastically supports the valve element, a plurality of valve portions that sequentially operate according to the water pressure are provided, and the change in the opening area is reduced. Not only is it possible to improve the startup characteristics that are important as a constant flow valve, but it is also possible to stabilize it by using multiple valve parts even when the water source pressure is high and the throttle needs to be set very small. In addition, it is possible to perform flow control without generating noise.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a constant flow valve according to a first embodiment of the present invention. FIG. 2 is a bottom view of a valve body of an identification flow valve. FIG. 3 is a side view of a valve body of an identification flow valve. FIG. 5 is a schematic cross-sectional view showing a constant flow valve according to a second embodiment of the present invention. FIG. 6 is a bottom view of a valve body of the identified flow valve. FIG. FIG. 8 is a schematic cross-sectional view showing a constant flow valve according to Embodiment 3 of the present invention. FIG. 9 is a bottom view of the valve element of the identified flow valve. FIG. 10 is a side view of the valve element of the identified flow valve. FIG. 11 is a schematic sectional view showing a conventional constant flow valve. FIG. 12 is a perspective view showing a valve element of an identification flow valve.
Reference Signs List 10 water supply source 11 piping 12, 17, 20 valve body 13, 22 support member 14 flow paths 16A, 16B, 18, 21 throttle groove 19 valve member 22A, 22B step

Claims (3)

A pipe connected to a water supply source provided in the apparatus, a bottomed cylindrical valve body having a predetermined gap with respect to the inner diameter of the pipe, and elastically supporting an end face of the valve body on a downstream side of the valve body, And a support member having a flow path near the center, wherein the valve body has a plurality of throttle grooves having different opening areas formed on an end face side thereof. A pipe connected to a water supply source provided in the apparatus, a bottomed cylindrical valve body having a predetermined gap with respect to the inner diameter of the pipe, and elastically supporting an end face of the valve body on a downstream side of the valve body, And a support member having a flow path near the center, wherein the valve body has a throttle groove formed on an end face side thereof and a valve member provided opposite to the flow path of the support member. A pipe provided in the apparatus and connected to a water supply source, a bottomed cylindrical valve body having a predetermined gap with respect to the inner diameter of the pipe, and a valve body elastically supported on a downstream side of the valve body, and A support member having a flow path in the vicinity, wherein the valve body has a tapered surface on the bottom surface and a throttle groove formed in the tapered surface from the center to the outer periphery, and the support member has a taper of the valve body. Constant flow valve provided with a plurality of steps to support a flat surface.

Images