JP2004278581A - 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 flow in a region of a considerably small flow rate. <P>SOLUTION: A throttle channel 16 which makes communication between an outer periphery of a valve disc 12 and a channel 14 of a support member 13 from an outer periphery toward a center is arranged to an abut surface between the valve disc 12 provided so as to have a predetermined gap with respect to an inner diameter of piping 11 and the support member 13 elastically supporting the valve disc 12 and having the channel 14 in the vicinity of its center. A length in a flowing direction of the throttle channel 16 is ensured, and a pressure drop is generated in the length. Therefore, in a flow rate setting, by adjusting the length of the throttle channel 16, stable control is enabled even when the flow control is performed in the region of a considerably small flow rate. Further, since the pressure drop is generated slowly, the noise such as cavitation is not generated, whereby an operating characteristic becomes excellent. <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. 22 and 23, the constant flow valve includes a container-shaped valve 1, a support member 2 in contact with the valve 1, and a spring 3 inserted between the valve 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 amount of restriction is very large, and unstable phenomena such as cavitation are likely to occur in the restricted portion, and water flow noise is generated. 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 achieve the above object, the constant flow valve of the present invention has a valve element provided with a predetermined gap with respect to the inner diameter of the pipe, the valve element elastically supports the valve element, and has a flow path near the center. A throttle flow path is provided between the contact surface with the support member and communicates the flow path of the support member with the outer circumference of the valve body from the outer circumference toward the center.
[0008]
As a result, the length of the throttle channel in the flow direction is ensured, and a pressure drop also occurs within this length. Therefore, the flow rate is set by adjusting the length of the throttle channel so that the flow rate is extremely small. In the case of controlling the flow rate by using the above method, stable control can be performed, and a constant flow rate valve having excellent operation characteristics without noise such as cavitation can be obtained because the pressure drop occurs slowly.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 is a pipe which is built in a device directly connected to a water supply source and is connected to the water supply source, a valve body provided with a predetermined gap with respect to the inner diameter of the pipe, A support member, which is provided in a pipe on the downstream side of the valve body and elastically supports the valve body that receives a force in the flow direction, and has a flow passage near the center thereof, wherein the valve body contacts the support member. By providing a constant flow valve between the surfaces, which constitutes a throttle flow path that connects the outer circumference of the valve body and the flow path of the support member toward the center from the outer circumference, the flow direction length of the throttle flow path is ensured. Since the pressure drop occurs within this length, the flow rate can be controlled stably by adjusting the length of the throttle flow path, even when controlling the flow rate in an area where the flow rate is extremely small. In addition, since the pressure drop occurs slowly, it operates without generating noise such as cavitation. Excellent constant flow valve characteristics can be obtained.
[0010]
According to the second aspect of the present invention, one of the contact surfaces of the valve element and the support member is provided with a recess toward the center from the outer periphery to form a throttle channel between the other contact surface. With the constant flow valve according to the first aspect of the present invention, the throttle flow path can be simply configured, and a constant flow valve with excellent operation characteristics can be obtained.
[0011]
According to a third aspect of the present invention, the flow rate of the throttle channel in the flow direction is made longer than the effective length of the cross section of the throttle channel, thereby providing the constant flow valve according to the first or second aspect. It is possible to control the flow rate and suppress noise such as cavitation, and obtain a constant flow rate valve with excellent operation characteristics.
[0012]
According to a fourth aspect of the present invention, one of the contact surfaces of the valve element and the support member surrounds the flow path of the support member and is provided with a pair of projections reaching the outer periphery. The constant flow valve according to claim 1, wherein the restricting flow path communicates the outer periphery of the body with the flow path of the support member, the projection portion is displaced by fluid pressure, so that a large initial displacement amount can be obtained. The rising characteristics of the constant flow valve can be improved. In addition, the high pressure section and the low pressure section are separated and sealed by the projection, so that the constant flow rate valve can be stably operated by being reliably sealed.
[0013]
According to a fifth aspect of the present invention, the constant flow valve according to the fourth aspect further includes a groove formed in the throttle flow path to communicate the outer periphery of the valve body and the flow path of the support member. After the protrusion is completely displaced by the displacement, the diaphragm becomes a two-stage diaphragm that forms a diaphragm with a groove. The rise characteristics are improved by the displacement of the easily displaceable protrusion, and stable at high pressure. The operation is to stably operate with the aperture by the groove.
[0014]
According to a sixth aspect of the present invention, the constant flow valve according to any one of the fourth to sixth aspects, wherein the shape of the protrusion is set to have a small width at the tip and a large width at the root, thereby reducing the pressure. In some cases, the amount of displacement of the projection can be increased, and the rising characteristics of the constant flow valve are further improved.
[0015]
According to a seventh aspect of the present invention, the cross-sectional area of the throttle channel is set to be larger than the cross-sectional area of the groove. The rising characteristics of the constant flow valve are improved, and a constant flow valve with good stability at high pressure can be configured.
[0016]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
(Example 1)
1 to 3 show a constant flow valve according to a first embodiment of the present invention.
[0018]
In the figure, reference numeral 10 denotes a water supply source directly connected to a device such as a warm water flush toilet seat. Reference numeral 11 denotes a pipe built in the equipment and connected to the water supply source 10. The pipe 11 includes a vessel-shaped valve body 12 having a predetermined gap in the side wall with respect to the inner diameter of the pipe 11, and a valve body 12 that receives a force in the flow direction in the pipe 11 on the downstream side of the valve body 12. And a disk-shaped support member 13 for elastically supporting. The support member 13 is formed of an elastic body such as rubber, 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.
[0019]
A throttle channel that connects the outer periphery of the valve body 11 and the flow path 14 of the support member 13 from the outer periphery toward the center between the contact surfaces between the outer bottom surface of the valve body 11 and the upper surface of the support member 13. 17. In this embodiment, the throttle channel 17 traverses the recess 16 through the center of the valve body 12 from the outer periphery of the valve body 12 on the contact surface with the support member 13 which is the outer bottom surface of the valve body 12. It is configured in such a manner. The throttle channel 17 has a length L in the flow direction longer than the effective length W of the cross section of the throttle channel 17.
[0020]
The operation and operation of the constant flow valve configured as described above will be described below.
[0021]
First, water supplied from the water supply source 10 passes through a gap between the pipe 11 and the side wall of the valve body 12, passes through a throttle flow path 17 formed by the concave portion 16 of the valve body 12 and the support member 13, It flows further through 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 is elastically deformed. As a result, a part of the support member 13 is deformed and enters the concave portion 16 of the valve body 12, and the flow path area of the throttle flow path 17 decreases. When the flow path area of the throttle flow path 17 decreases, the pressure loss in the throttle flow path 17 increases, and the flow rate is controlled to be constant even when the pressure of the water supply source 10 increases.
[0022]
Although the pressure reduction by the constant flow valve mainly occurs in the throttle flow path 17, the flow direction of the throttle flow path 17 is secured, and a pressure drop occurs within this length. By adjusting the length of the passage 17, even when the flow rate is controlled in an area where the flow rate is extremely small, it is possible to control the flow rate stably, and the pressure drop occurs slowly, so that there is no noise such as cavitation. A constant flow valve with excellent characteristics can be obtained. In particular, since the throttle channel 17 is set to have a length L in the flow direction longer than the effective length W of the cross section, more stable flow control and suppression of noise such as cavitation are possible, and the operation characteristics are excellent. A constant flow valve is obtained.
[0023]
As described above, the present embodiment can solve the problem in the conventional example, and can provide a constant flow valve that is stable and does not generate noise even when the flow rate is controlled in a region where the flow rate is extremely small.
[0024]
(Example 2)
Next, a constant flow valve according to a second embodiment of the present invention will be described with reference to FIGS. The difference from the first embodiment lies in the configuration of the throttle channel 17, and is otherwise the same.
[0025]
That is, in the present embodiment, the throttle channel 17 is provided on the contact surface of the support member 13 with the valve body 12 so as to cross the recess 16 through the center of the support member 13 from the outer periphery of the support member 13. What constitutes. The first embodiment is different from the first embodiment in the member provided with the concave portion 16.
[0026]
In the constant flow valve configured as described above, the supporting member 13 is elastically deformed by the increase in the pressure of the water supply source 10, the cross-sectional area of the concave portion 16 of the supporting member 13 is reduced, The area is reduced. Thus, similarly to the first embodiment, the flow rate is controlled to be constant.
[0027]
(Example 3)
Next, a constant flow valve according to a third embodiment of the present invention will be described with reference to FIGS. The difference from the first embodiment lies in the configuration of the throttle channel 17, and is otherwise the same.
[0028]
That is, in the present embodiment, a pair of arc-shaped projections 19 that surround the flow path 14 of the support member 13 and reach the outer periphery are provided on the contact surface of the valve body 12 with the support member 13 which is the outer bottom surface. A throttle channel 17 is provided between the contact surface of the support member 13 and the outer periphery of the valve body 12 and the channel 14 of the support member 13. More specifically, both ends of the arc-shaped projection 19 are opposed to each other in parallel, and the throttle channel 17 is formed here.
[0029]
In the constant flow valve configured as described above, the fluid pressure acting on the valve body 12 increases due to the increase in the pressure of the water supply source 10, so that the force with which the valve body 12 comes into pressure contact with the support member 13 increases. The support member 13 is elastically displaced by the pressing of the projection 19. As a result, the cross-sectional area of the throttle channel 17 formed by pressing the projection 19 provided on the valve body 12 and the support member 13 is reduced. Thus, similarly to the first embodiment, the flow rate is controlled to be constant.
[0030]
Further, in this embodiment, since the projection 19 enters the support member 13 due to the fluid pressure and the projection 19 is displaced, the initial displacement amount can be increased, and the rising characteristic of the constant flow valve can be improved. Further, since the high pressure portion and the low pressure portion are partitioned and sealed by the projection 19, the sealing is reliably performed, and the constant flow valve can be operated stably.
[0031]
(Example 4)
Next, a constant flow valve according to a fourth embodiment of the present invention will be described with reference to FIGS. The difference from the third embodiment lies in the configuration of the throttle channel 17, and is otherwise the same.
[0032]
That is, in the present embodiment, a pair of arc-shaped projections 19 that surround the flow path 14 of the support member 13 and reach the outer periphery are provided on the contact surface of the support member 13 with the valve body 12. Between the contact surface of the valve member 12 and the flow path 14 of the support member 13. The third embodiment is different from the third embodiment in the member on which the protrusion 19 is provided.
[0033]
In the constant flow valve configured as described above, the fluid pressure acting on the valve body 12 increases due to the increase in the pressure of the water supply source 10, so that the force with which the valve body 12 comes into pressure contact with the support member 13 increases. The projection 19 elastically displaces. As a result, the cross-sectional area of the throttle passage 17 is reduced, and the flow rate is controlled to be constant as in the first embodiment.
[0034]
Further, in the present embodiment, since the protrusion 19 itself is elastically displaced by the fluid pressure, as in the third embodiment, the improvement of the rising characteristic of the constant flow valve and the sealing effect can be obtained.
[0035]
(Example 5)
Next, a constant flow valve according to a fifth embodiment of the present invention will be described with reference to FIGS. The difference from the third embodiment is that a groove 20 for communicating the outer periphery of the valve body 12 and the flow path 14 of the support member 13 inside the pair of projections 19 provided on the valve body 12, that is, in the throttle flow path 17. Is formed, and the length L of the groove 20 in the flow direction is longer than the effective length W of the cross section of the groove 20. Others are the same.
[0036]
In the constant flow valve configured as described above, the fluid pressure acting on the valve body 12 increases due to the increase in the pressure of the water supply source 10, so that the force with which the valve body 12 comes into pressure contact with the support member 13 increases. The support member 13 is elastically displaced by the pressing of the projection 19. As a result, the cross-sectional area of the throttle channel 17 formed by pressing the projection 19 provided on the valve body 12 and the support member 13 is reduced. Thus, similarly to the first embodiment, the flow rate is controlled to be constant.
[0037]
Further, when the pressure of the water supply source 10 rises, the pair of projections 19 of the valve body 12 have a small pressure receiving area on the support member 13, and therefore are relatively easily displaced even in a low-pressure region, and are absorbed in the support member 13. The area of the throttle channel 17 becomes substantially zero, and the throttle channel 17 is closed. After this predetermined pressure, the groove 20 provided inside the pair of projections 19 functions as a second throttle channel. Although the groove 20 has a small change in the flow path area at high pressure, the length L in the flow direction is set to be longer than the effective length W of the flow path cross section. By controlling the flow rate by reducing the pressure by the length, it is possible to stabilize the throttling action and to prevent noise such as cavitation.
[0038]
(Example 6)
Next, a constant flow valve according to a sixth embodiment of the present invention will be described with reference to FIGS. The difference from the fourth embodiment is that a groove 20 for communicating the outer periphery of the valve body 12 and the flow path 14 of the support member 13 inside the pair of projections 19 provided on the support member 13, that is, in the throttle flow path 17. Is formed, and the length L of the groove 20 in the flow direction is longer than the effective length W of the cross section of the groove 20. Others are the same.
[0039]
In the constant flow valve configured as described above, the fluid pressure acting on the valve body 12 increases due to the increase in the pressure of the water supply source 10, so that the force with which the valve body 12 comes into pressure contact with the support member 13 increases. The projection 19 elastically displaces. As a result, the cross-sectional area of the throttle channel 17 formed by pressing the projection 19 provided on the support member 13 and the valve body 12 is reduced. Thus, similarly to the first embodiment, the flow rate is controlled to be constant.
[0040]
Further, the operation and action of the throttle channel 17 and the groove 20 functioning as the second throttle channel when the pressure of the water supply source 10 increases are the same as those in the fifth embodiment.
[0041]
(Example 7)
Next, a constant flow valve according to a seventh embodiment of the present invention will be described with reference to FIGS.
[0042]
In this embodiment, the shape of the projection 19 provided on the valve body 12 or the support member 13 is such that the width of the tip is small and the width of the root shape is large. 19 shows an example in which the cross-sectional shape of the projection 19 of the valve body 12 is semicircular, and FIG. 20 shows an example in which the cross-sectional shape of the projection 19 is also trapezoidal. However, any shape other than the illustrated one may be used as long as the shape is a projection along the above-mentioned purpose.
[0043]
In the constant flow valve configured as described above, the shape of the projection 19 ensures the sealing performance when the valve element 12 is displaced at low pressure, and the projection 19 has a large width on the root side at high pressure. Therefore, the displacement amount is suppressed, and the constant flow rate characteristics can be improved. In particular, the displacement of the projection 19 can be increased at low pressure, and the rising characteristic of the constant flow valve is further improved.
[0044]
(Example 8)
Next, a constant flow valve according to an eighth embodiment of the present invention will be described with reference to FIG.
[0045]
In this embodiment, the sectional area Sb of the throttle channel 17 is set to be larger than the sectional area Sa of the groove 20 in the fifth and sixth embodiments.
[0046]
The change in the flow area in the constant flow valve configured as described above will be described in the case of the configuration shown in the drawing. The sum of the cross-sectional area Sb of the throttle passage 17 and the cross-sectional area Sa of the groove 20 becomes the initial value, and the rising characteristic is obtained. Will be better. Further, when the tap water source pressure is low, the change in the flow path area mainly occurs in the cross-sectional area Sb, and the change in the passage area of the cross-sectional area Sb occurs in the pair of projections 19 and the support member 13. Therefore, the spring constant is low and the pressure is low. , The cross-sectional area Sb greatly changes, and a constant flow rate characteristic at low pressure can be secured. Further, the change in the cross-sectional area Sa is small even at high pressure, and the flow rate can be controlled stably. Further, since the cross-sectional area Sb is configured to be larger than the cross-sectional area Sa, reduction in pressure loss at low pressure and stabilization of constant flow rate characteristics at high pressure can be realized.
[0047]
【The invention's effect】
As described above, according to the constant flow valve of the present invention, a valve body provided with a predetermined gap with respect to the inner diameter of the pipe, a support that elastically supports the valve body and has a flow path near the center Between the contact surfaces with the members, a throttle flow path is formed to communicate the outer circumference of the valve body and the flow path of the support member from the outer circumference toward the center, and the length of the throttle flow path in the flow direction is ensured. Since the pressure drop occurs within this length, the flow rate can be set stably by adjusting the length of the throttle flow path, even when the flow rate is controlled in an area where the flow rate is extremely small. It is possible to obtain a constant flow valve having excellent operating characteristics without generating noise such as cavitation since the pressure drop occurs slowly.
[Brief description of the drawings]
1 is a cross-sectional view of a constant flow valve according to a first embodiment of the present invention; FIG. 2 is a plan view showing a valve body of an identification flow valve; FIG. 3 is a side view of the valve body; FIG. FIG. 5 is a plan view showing a support member of the identified flow valve. FIG. 6 is a side view of the support member. FIG. 7 is a cross-sectional view of the constant flow valve in Embodiment 3 of the present invention. FIG. 8 is a plan view showing a valve element of the identified flow valve. FIG. 9 is a side view of the valve element. FIG. 10 is a cross-sectional view of a constant flow valve according to a fourth embodiment of the present invention. FIG. 12 is a side view of the support member. FIG. 13 is a cross-sectional view of a constant flow valve according to a fifth embodiment of the present invention. FIG. 14 is a plan view showing a valve element of an identification flow valve. FIG. 16 is a side view of a valve body. FIG. 16 is a cross-sectional view of a constant flow valve according to Embodiment 6 of the present invention. FIG. 17 is a plan view showing a support member of the identified flow valve. FIG. 19 is a cross-sectional view showing a projection shape of a constant flow valve according to a seventh embodiment of the present invention. FIG. 20 is a cross-sectional view showing another projection shape. FIG. FIG. 22 is a cross-sectional view showing a conventional constant flow valve. FIG. 23 is a perspective view showing a valve element of an identification flow valve.
DESCRIPTION OF SYMBOLS 10 Water supply source 11 Piping 12 Valve element 13 Support member 14 Flow path 16 Depression 17 Restricted flow path 19 Projection 20 Groove

Claims (7)

A pipe built in equipment used directly connected to the water supply source and connected to the water supply source, a valve element provided with a predetermined gap with respect to the inner diameter of the pipe, and a pipe downstream of the valve element And a support member elastically supporting the valve body receiving a force in the flow direction, and having a flow path near the center, between the contact surfaces of the valve body and the support member, from the outer periphery toward the center. A constant flow valve that forms a throttle flow path that connects the outer periphery of the valve body to the flow path of the support member. 2. The constant flow rate according to claim 1, wherein a concave portion is provided on one of the contact surfaces of the valve body and the support member from the outer periphery toward the center to form a throttle channel between the contact surface and the other contact surface. valve. 3. The constant flow valve according to claim 1, wherein a length of the throttle channel in the flow direction is longer than an effective length of a cross section of the throttle channel. One of the contact surfaces of the valve element and the support member surrounds the flow path of the support member, and a pair of projections reaching the outer periphery are provided, and the outer periphery of the valve element and the flow path of the support member are provided between the other contact surfaces. The constant flow valve according to claim 1, wherein a throttle flow path configured to communicate with the valve is configured. 5. The constant flow valve according to claim 4, wherein a groove for communicating the outer periphery of the valve body with the flow path of the support member is further formed in the throttle flow path. The constant flow valve according to any one of claims 4 to 6, wherein the shape of the projection has a small width at the tip and a large width at the root. 7. The constant flow valve according to claim 5, wherein a sectional area of the throttle passage is set larger than a sectional area of the groove.

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