JPH06174118A - Fluid valve - Google Patents

Abstract

PURPOSE:To enable a selector/water stop valve to reduce a load acting on a selector/water stopping motor to drive a rotary disc. CONSTITUTION:A rotary disc 160 rotates in such state as clamped with a small- diameter stationary disc 150 and a large-diameter stationary disc 180 for selecting a flow passage. An axial force acting on the side edge 168 of the disc 160 due to a primary flow passage corresponds to a contact resistance force applied from the disc 150. Also, this contact resistance force is approximately equal to a force acting from the primary flow passage on the pressure receiving surface of the disc 150. Consequently, the disc 160, where not in contact with the disc 150, is isolated from the primary flow passage via an O-ring and, therefore, a load acting on the disc 150 due to liquid pressure from a primary side fluid can be alleviated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid valve capable of switching a water discharge port, stopping water flow and adjusting a flow rate by using two discs in close contact with each other.

[0002]

2. Description of the Related Art Conventionally, as a fluid valve of this type, for example, there is a three-way switching valve 300 shown in FIG. In FIG. 4, the three-way switching valve 300 includes a fitting hole 304 and a case 302 having a primary-side flow path 306 communicating with the fitting hole 304, and the fixed disk 31 is provided in the fitting hole 304.
0, the rotary disk 320 is stored and the lid 330
Is attached. The fixed disk 310 has a first connection flow path 312 and a second connection flow path 314,
First branch channel 332 and second branch channel 3 of lid 330
34, respectively. In addition, the rotating disk 320 has a drive shaft 342 of the motor 340 at the center thereof.
And a third connection channel 324 connected to the first connection channel 312 or the second connection channel 314 depending on the rotational position. Further, a first sheet packing 336 and a second sheet packing 338 are attached to the opening peripheral portions of the first branch flow path 332 and the second branch flow path 334 of the lid 330, respectively, and the first disc packing 336 and the first disc packing The connection flow path 312 and the second connection flow path 314 are sealed. Further, an O-ring 344 for sealing the fluid in the primary side flow passage 306 is attached to the outer periphery of the drive shaft 342 of the motor 340.

With the structure of the three-way switching valve 300, when the motor 340 is driven, the rotary disk 320 rotates. Depending on the rotational position of the rotary disk 320, the third
The connection channel 324 is the first connection channel 3 of the fixed disk 310.
12 or the second connection flow path 314, the hot and cold water from the primary side flow path 306 is supplied to the first branch flow path 33.
It will flow into either the second or the second branch flow path 334.

[0004]

However, in the conventional three-way switching valve 300, the hydraulic pressure flowing from the primary side flow passage 306 is applied to the side end surface of the rotary disk 320.
The load on the motor 340 that drives the rotating disk 320. Therefore, in order to rotate the rotating disk 320 smoothly, it is desirable that the value is small. In particular, when the motor 340 is driven by a battery, an increase in sliding resistance accelerates battery consumption, so it is necessary to minimize the value.

The present invention solves the above-mentioned problems of the prior art, and provides a fluid valve which realizes smooth rotation of a rotating disk by reducing the sliding resistance between the rotating disk and a fixed disk. The purpose is to

[0006]

SUMMARY OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, has a fitting valve in a fluid valve for changing the flow rate and the flow rate of a liquid flowing from a primary side flow passage to a secondary side flow passage. A case having the same, a rotary disk rotatably supported in the fitting hole and having a first connection flow path, and a rotary disk fixed in the fitting hole and sealingly in surface contact with the rotary disk for sliding rotation. Is disposed coaxially with the rotary disc, has a through hole in its central axis, and connects or disconnects the first connection flow channel and the secondary side flow channel in accordance with the rotational position of the rotary disc. First having a second connection channel
A fixed disk; a holding hole provided on the bottom surface of the fitting hole, the holding hole having a diameter smaller than that of the fitting hole and facing the primary side flow path;
It has a third connection flow path held in the holding hole and connecting the primary side flow path and the first connection flow path of the rotating disk, and one side surface serves as a pressure receiving surface for the fluid flowing through the primary side flow path, and the other. It is characterized by comprising a second fixed disk whose side surface is in contact with the rotary disk, and a seal member for sealing between the holding hole and the outer periphery of the second fixed disk.

[0007]

In the fluid valve of the present invention, when the motor is rotated, the rotary disk is rotated by the drive shaft provided through the through hole of the first fixed disk. The rotating disc has a second
A first connection channel is provided which is connected to the primary side channel via the third connection channel of the fixed disk, and the first connection channel is the second connection channel provided in the first fixed disk. , Is connected or disconnected depending on the rotational position of the rotating disk. As a result, the primary side flow path is connected to or disconnected from the secondary side flow path through the third connection flow path of the first fixed disk, the first connection flow path of the rotating disk, and the second connection flow path of the second fixed disk. To be done.

Here, the rotating disk is rotated by the drive of the motor while receiving the fluid pressure from the primary side flow path.
The fluid pressure received from the primary side flow path becomes a load on the motor. Of the forces applied to the rotary disc, the force directed from the upstream side of the primary side flow path in the axial direction is the contact resistance force received from the second fixed disc, and this contact resistance force is generated by the pressure receiving surface of the second fixed disc. It is almost equal to the force received from the road.
Further, due to the sealing action of the second fixed disc held in the holding hole via the seal member, the fluid pressure of the primary side flow passage is not applied to the portion of the side surface of the rotary disc that does not come into contact with the second fixed disc. Therefore, the primary pressure corresponding to the pressure receiving surface of the second fixed disk, which is smaller than the area of the side surface, is applied to the side surface of the rotating disk, and the primary pressure is not applied to the portion that does not contact the second fixed disk. As a result, the load on the motor is reduced by the amount of the force due to the primary pressure corresponding to the area of the difference between the side surface of the rotating disk and the pressure receiving surface of the second fixed disk.

[0009]

Preferred embodiments of the present invention will be described below in order to further clarify the structure and operation of the present invention described above.

FIG. 1 shows a fluid valve 15 according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view of the present invention, which is used for a hot water supply device such as a bathroom, which mixes hot water and water to adjust the temperature to a desired temperature and discharges water, and also switches to a shower or bath balun.

As shown in the figure, the fluid valve 15 has a housing 61, to which a hot and cold water mixing valve 60, a preload adjusting mechanism 100, a temperature sensor 110 and a switching / water shutoff valve 1 are provided.
30 is incorporated. A water inlet 85 and a hot water inlet 95 are formed in the housing 61, a water side faucet is connected to the water inlet 85, and a hot water tap of a water heater is connected to the hot water inlet 95.

The hot and cold water mixing valve 60 has annular passages 86 and 96 which respectively communicate with the water inlet 85 and the hot water inlet 95, a valve chamber 63 which accommodates the movable valve body 70 slidably in the axial direction, and a hot and cold water mixing chamber 64. Have and. The valve chamber 63 is defined by a water side valve seat 87 and a water side valve seat 97 which are perpendicular to the axis of the hot and cold water mixing valve 60, and an axial bore 62. Movable valve body 70
Has a cylindrical portion 71 and a radial web 72.

A minute clearance is provided between the outer diameter of the cylindrical portion 71 and the inner diameter of the bore 62. The web 72 of the movable valve body 70 is provided with a plurality of openings 73, and the hot water inlet 9
Hot water flowing into the valve chamber 63 from 5 flows into the hot and cold water mixing chamber 64 through the opening 73 and is mixed with water. The mixing ratio of water and hot water changes as the movable valve body 70 is displaced in the axial direction. It should be noted that if the movable valve body 70 is displaced to a position where it is engaged with the water side valve seat 87 and water is shut off, only hot water will flow out, and the movable valve body 70 will be displaced to a position where it will be engaged with the hot water side valve seat 97. Then, if the hot water is shut off, only water will flow out.

The movable valve body 70 is positioned by the balance of the forces of the temperature sensitive coil spring 80 arranged in the hot and cold water mixing chamber 64 and the second coil spring 90 arranged in the valve chamber 63. . Therefore, one end of the temperature-sensitive coil spring 80 is supported by the first spring bearing 75 fixed to the housing 61 by the retaining ring 74, and the other end is supported by the second spring bearing 76 fixed to the movable valve body 70. There is. Further, one end of the second coil spring 90 is supported by a third spring bearing 77 that interlocks with the movable valve body 70, and the other end is supported by a movable spring bearing 102 of the preload adjusting mechanism 100. For the convenience of assembly, the second spring receiver 76 penetrates the web 72 and is screwed with the third spring receiver 77.

The temperature-sensitive coil spring 80 is made of a metal whose spring constant changes according to temperature.
The coil spring 90 is made of a conventional spring material having a constant spring constant with respect to temperature. An alloy belonging to the category of shape memory alloy (SMA) made of nickel-titanium alloy is known as a metal material whose spring constant changes according to temperature. The elastic coefficient of this type of SMA changes with temperature, and as a result, the spring constant of the temperature-sensitive coil spring 80 made of SMA changes with temperature. The temperature-responsive temperature-sensitive coil spring 80 having desired temperature characteristics made of SMA can be obtained from various suppliers. For example, there is “KTS-SM alloy” manufactured by Kanto Special Steel Co., Ltd.

Further, in order to save the energy of the battery consumed by the preload adjusting mechanism 100, the spring constant and the preload of the temperature sensitive coil spring 80 are the spring force (generated load).
Must be set to be sufficiently small. On the other hand, the temperature-sensitive coil spring 80 is in a low temperature condition where only water should be discharged (at this time, the preload applied to the second coil spring 90 can be made zero, and the movable valve body 70 is The valve seat 97 on the water side only by the spring force
In the case of (pressed to), it is necessary to generate a spring force that presses the movable valve body 70 against the hot water valve seat 97 with a force sufficient to block the inflow of hot water. Therefore, the spring constant and preload of the temperature-sensitive coil spring 80 are set so that the spring force generated at low temperature (for example, when the water supply temperature is 5 ° C.) is 500 g or less, preferably 300 g or less.

The preload adjusting mechanism 100 is constructed so that the preload of the second coil spring 90 can be varied by rotating the preload adjusting motor 105 in either direction. Therefore, the movable spring bearing 102 is axially displaceable and non-rotatably spline-fitted to the end member 101 that is liquid-tightly fastened to the housing 61. Preload adjustment motor 105
The worm 104 formed on the output shaft 103 of is engaged with each other. Further, the output shaft 103 of the preload adjusting motor 105
Is sealed by an O-ring 106.

The preload adjusting mechanism 100 thus constructed
Rotates the preload adjusting motor 105 in a predetermined direction,
By displacing the movable spring receiver 102 to the right in the figure, the preload of the second coil spring 90 is increased, while the preload adjusting motor 105 is rotated in the opposite direction,
By displacing the movable spring receiver 102 to the left in the figure, the preload of the second coil spring 90 is reduced.

The temperature sensor 110 is arranged downstream of the first spring receiver 75, which is the outlet of the hot and cold water mixing valve 60, so that the hot and cold water sensor directly contacts the hot and cold water mixing valve 60. It is liquid-tightly fastened to the housing 61.

The switching / water shutoff valve 130 is arranged downstream of the temperature sensor 110 as shown in FIG.
The housing 61 includes a valve connection flow path 132, an annular step portion 134, and a fitting hole 136 formed in the housing 61. An O-ring annular groove 144 is formed in the annular step portion 134,
An O-ring annular groove 146 is formed in the fitting hole 136.

A small-diameter fixed disk 150 is fitted in the annular step portion 134, and the small-diameter fixed disk 15 is fitted.
0 is sealed by an O-ring 212 housed in an O-ring annular groove 144 on the outer peripheral portion thereof. This small-diameter fixed disk 150 has a connecting channel 152 in its central axis, and its outer surface is a pressure receiving surface 154, an outer peripheral surface 156, and a side end surface 158.

A rotary disk 160 is rotatably supported by the fitting hole 136 with respect to the bottom surface 138 and the side surface 142 (see FIG. 2). The rotating disk 160 is
The central end face has a holding hole 162 that is a bottomed hole, a central flow channel 164 that communicates with the connection flow channel 152, and a fan-shaped flow channel 166 that is connected to the central flow channel 164, and the outer peripheral portion thereof. Is a side end surface 168, a side end surface 172, and an outer peripheral surface 174.

Further, the fitting hole 136 is provided with a large-diameter fixed disk 180 housed so as to be in contact with the rotary disk 160 and fixed to the housing 61. The large-diameter fixed disk 180 is sealed at its outer peripheral portion by an O-ring 214 housed in the O-ring annular groove 146. Further, the large-diameter fixed disk 180 is provided with a through hole 182 in the center thereof, a first connection flow path 184 and a second connection flow path 186 having a fan-shaped cross section, and a water stop end surface 189 slightly recessed. The end surface on the side of the rotary disk 160 is a side end surface 188.

An end face holding member 200 is fixed to the opening of the fitting hole 136 of the housing 61 so as to seal. The end face holding member 200 has a through hole 2 at the center thereof.
02, and further has a first water discharge channel 204 communicating with the first connection channel 184 and a second water discharge channel 206 communicating with the second connection channel 186. The first water discharge passage 204 and the second water discharge passage 206 are sealed at their inner peripheral portions by a sheet packing 216.

On the end face of the end face holding member 200, switching /
A water shutoff motor 190 is attached, and this switching /
The drive shaft 192 of the water stop motor 190 penetrates the through hole 202 and is fixed to the holding hole 162 of the rotary disc 160, and is configured to rotate the rotary disc 160 by driving the switching / water stop motor 190. There is.

Next, the switching operation of the switching / stop valve 130 will be described. The switching operation of the switching / stop valve 130 is
This is performed by driving the switching / water stop motor 190 and rotating the rotary disk 160 to a predetermined position via the drive shaft 192. At this time, the fan-shaped channel 166 of the rotary disc 160 is connected to the first connection channel 184 of the large-diameter fixed disc 180.
When it is matched with, the mixed hot and cold water from the valve connection flow path 132 side of the hot and cold water mixing valve 60 is connected to the connection flow path 1 of the small diameter fixed disk 150.
52 through the central flow path 164 and the fan-shaped flow path 166 of the rotary disk 160 to the first connection flow path 184 of the large-diameter fixed disk 180, and the first end surface holding member 200
It is supplied to the shower through the water discharge passage 204.

On the other hand, the fan-shaped channel 16 of the rotating disk 160.
When 6 is aligned with the second connection flow path 186 of the large diameter fixed disk 180, the mixed hot and cold water from the valve connection flow path 132 side of the hot and cold water mixing valve 60 is connected to the connection flow path 152 of the small diameter fixed disk 150.
Through the central flow path 164 and the fan-shaped flow path 166 of the rotary disk 160 to the second connection flow path 186 of the large-diameter fixed disk 180, and further to the currant via the second discharge flow path 206 of the end face holding member 200. It

Further, the fan-shaped flow path 16 of the rotating disk 160.
When 6 is an offset that is not connected to either the first connection flow path 184 or the second connection flow path 186 of the large-diameter fixed disk 180, that is, when it is aligned with the water stop end surface 189, the water is stopped.

That is, by rotating the rotary disc 160, the fan-shaped flow passage 166 is slid between the side end face 172 thereof and the side end face 188 of the large-diameter fixed disc 180, and the fan-shaped flow passage 166 is connected to the first connection flow passage 184 and the second connection flow passage 184. By switching to the flow path 186 or the water stop end surface 189, the supply destination and the flow rate of the mixed hot water are changed or the water is stopped.

In such switching operation of the rotary disk 160, the contact force of the rotary disk 160, that is, switching /
The load of the water shutoff motor 190 is represented below as a load FTH during water flow and a load FST during water cutoff. That is,
At the load FTH during water passage, the side end surface 168 of the rotary disc 160 receives the force received through the small-diameter fixed disc 150, the force exerted upward by the fan-shaped channel 166, and the upward force exerted by the seat packing 216 on the side end surface 168, as shown in Expression (1). A contact force FTH1 is added, which is the sum of the tightening reaction force f directed toward and the force applied downward in the central channel 164.

On the other hand, the side end surface 172 of the rotary disk 160
In addition, as shown in the equation (2), the upward tightening reaction force f by the seat packing 216, the small diameter fixed disk 150
The contact force FTH2, which is the sum of the downward force, the upward force applied by the fan-shaped channel 166, and the downward force exerted by the central channel 164, is applied.

FTH1 = 1 / 4π (d2 ² −d1 ² ) · P + A · P + (f−1 / 4πd1 ² · P) (1) FTH2 = f + {1 / 4π (d2 ² −d1 ² ) · P− A · P + 1 / 4πd1 ² · P} (2) d1: inner diameter of small-diameter fixed disc 150 d2: outer diameter of small-diameter fixed disc 150 A: flow passage area of flow passage 166, flow passage 184, flow passage 186 P: fluid As a result, the contact forces FTH1 and FTH2 are applied to the rotating disk 160.
Based on and, the load FTH in equation (3) is added. FTH = (FTH1 + FTH2) / 2 = 1 / 4π (d2 2 -d1 2) · P + f ... (3) Here, the approximately equal to A to 1 / 4πd1 ^2.

On the other hand, when the water is stopped, the fluid pressure A · P by the fan-shaped channel 166 is applied to the side end surface 168 of the rotary disk 160.
Is not added, this is subtracted to obtain Equation (4) and Equation (5).

FST1 = 1 / 4π (d2 ² −d1 ² ) · P + A · P + (f−1 / 4πd1 ² · P−A · P) (4) FST2 = f−A · P + {1 / 4π (d2 ^{2 -d1 2) · P-A} · P + 1 / 4πd1 2 · P} ... (5)

Therefore, the load FST of the equation (3) is applied to the rotating disk 160 based on the contact forces FST1 and FST2. FST = (FST1 + FST2) / 2 = 1 / 4π (d2 ² −d1 ² ) · P + f−A · P (6)

The seat packing 216 also has a function of preventing the position of the rotary disk 160 from becoming unstable due to a negative value of FST when water is stopped, but the seat packing 216 has a minimum value so as not to increase this load. Set.

As described above, the rotating disk 160 rotates while sliding between the small-diameter fixed disk 150 and the large-diameter fixed disk 180, and this sliding force becomes the load of the switching / water-stopping motor 190. Among the forces received by the side end surface 168 of the rotary disc 160, the force directed from the upstream to the axial direction is the contact force received from the small diameter fixed disc 150,
This contact force is applied to the pressure receiving surface 154 of the small diameter fixed disk 150.
Is almost equal to the force received from the valve connection channel 132.

That is, the side end surface 1 of the rotary disk 160
A portion of the side end surface 168 of 68 which is not in contact with the small-diameter fixed disk 150 is sealed by the O-ring 212 so that the fluid pressure of the valve connection channel 132 is not applied. As a result, compared with the load when pressure is received on the entire side end surface 168 as in the conventional technique, a primary area corresponding to the difference area between the side end surface 168 of the rotating disk 160 and the pressure receiving surface 154 of the small diameter fixed disk 150. The load of the switching / water-stopping motor 190 is reduced by the amount of the pressure force. According to the above-mentioned example, it was possible to achieve a reduction in load resistance of 12% when water was passed and 45% when water was stopped.

[0039]

As described above, according to the present invention, the other end surface of the rotary disk is the fluid valve that connects or blocks the flow path by rotating the rotary disk driven by the motor with respect to the first fixed disk. A second fixed disk having a smaller diameter than the rotating disk is provided, and the second fixed disk receives the fluid pressure in the primary side flow path to reduce the fluid pressure from the primary side flow path to the rotating disk. Because
The load on the motor can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a fluid valve according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a rotary disk and a fixed disk according to the embodiment.

FIG. 3 is a cross-sectional view showing a switching / water shutoff valve that is a main part of FIG.

FIG. 4 is a sectional view showing a conventional three-way switching valve.

[Explanation of symbols]

 15 ... Fluid valve 60 ... Hot water mixing valve 100 ... Preload adjusting mechanism 110 ... Temperature sensor 130 ... Switching / water shutoff valve 132 ... Valve connecting flow path 134 ... Annular step 136 ... Fitting hole 138 ... Bottom surface 142 ... Side surface 144 ... O-ring annular groove 146 ... O-ring annular groove 150 ... Small diameter fixed disk 152 ... Connection channel 154 ... Pressure receiving surface 156 ... Outer peripheral surface 158 ... Side end surface 160 ... Rotating disk 162 ... Holding hole 164 ... Central channel 166 ... Fan-shaped Flow path 168 ... Side end surface 172 ... Side end surface 174 ... Outer peripheral surface 180 ... Large diameter fixed disk 182 ... Through hole 184 ... First connection flow path 186 ... Second connection flow path 188 ... Side end surface 189 ... Water stop end surface 190 ... Switching / Water stop motor 192 ... Drive shaft 200 ... End face holding member 202 ... Through hole 204 ... First water discharge flow path 206 ... Second water discharge flow path 212 ... O ring 21 4 ... O-ring 216 ... Seat packing

Claims (1)

[Claims] 1. A fluid valve for changing a flow rate and a flow path of a liquid flowing from a primary-side flow path to a secondary-side flow path, a case having a fitting hole, and a rotatably supported by the fitting hole. A rotary disc having a connecting flow path, coaxially arranged with the rotary disc so as to rotate and slide in a state of being fixed in the fitting hole and sealed in surface contact with the rotary disc, and having a center axis thereof. A first fixed disk having a through hole and having a second connection flow path that connects or disconnects the first connection flow path and the secondary side flow path in accordance with the rotational position of the rotary disk; and the fitting hole A holding hole having a diameter smaller than that of the fitting hole and facing the primary side flow path, and a primary side flow path held by the holding hole and the first connecting flow path of the rotating disk. Has a third connection flow path connecting one side, and one side surface flows through the primary side flow path. A second fixed disk which is a pressure receiving surface for the body and whose other side is in contact with the rotary disk; and a seal member which seals between the holding hole and the outer circumference of the second fixed disk. A fluid valve that does.