JP2011236921A - Constant flow rate device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constant flow rate device capable of easily providing an outflow quantity of a predetermined flow rate, providing straightened outflow water, and easily and inexpensively changing an outflow flow rate by easily setting a flow rate of the outflow water, when supply side hydraulic pressure varies.SOLUTION: A constant flow rate valve is constituted by installing a straightener 114 of out-fitting an elastic ring 116 to a collared columnar part 148 in a circular cylindrical valve body 112. A pressure liquid advances in a straightening groove 154 after being straightened by a straightening hole 152 formed in a collar part 146, and flows out of an outflow port 172 defined by the straightening groove and an outflow hole 118 of the valve body after passing through a flow rate regulating passage 176 defined by the elastic ring and the straightening groove. The elastic ring is deformed by the pressure liquid, and the flow passage cross-sectional area of the flow rate regulating passage is narrowed. The liquid corresponding to the flow passage cross-sectional area flows out of the outflow port, and the predetermined flow rate can be provided.

Description

The present invention relates to a constant flow rate device that is disposed in a liquid flow path and can maintain a constant flow rate on the outflow side even when the pressure of a supply side liquid changes.
More specifically, the present invention relates to a so-called constant flow valve that is arranged in a water pipe and can make the flow rate from a faucet on the outflow side constant even when the water pressure on the supply side varies.
Furthermore, the present invention relates to a so-called water-saving valve that is arranged in a water pipe and can save water by keeping the flow rate from a faucet on the outflow side constant even when the water pressure on the supply side fluctuates.
The “liquid” used in this specification is a general term for seasonings such as water, seawater, juice, or soy sauce, or oil.

  As a first prior art, a commutator having a corrugated cross-section is formed by alternately forming ridges and arcuate grooves at the bottom and arcuate at the tip and parallel to the axis at the center. A constant flow device in which a cylindrical side wall is disposed concentrically with the commutator to form a cylindrical livestock fluid portion between the commutator and the side wall, and an elastic ring is disposed in the livestock fluid portion. It is known (see, for example, Patent Document 1).

As a second conventional technique, a commutator having a corrugated cross-section is formed by forming a fingertip-shaped protrusion radially on the peripheral surface of a cylindrical shape at the center, and a cylindrical side wall concentrically with the commutator A constant flow device is known in which a cylindrical livestock part is configured between the commutator and the side wall, and an elastic ring is placed in the livestock part.
(For example, see Patent Document 2).

  As a third conventional technique, a commutator having a corrugated cross section is arranged by a cylindrical shape at the center and a fingertip shape on the peripheral surface, and radially by four large protrusions and small protrusions disposed between these large protrusions, There is known a constant flow device in which a cylindrical side wall is disposed concentrically with the commutator to form a cylindrical livestock fluid portion between the commutator and the case, and an elastic ring is disposed in the livestock fluid portion. (For example, see Patent Document 3).

Japanese Patent Publication No.51-023059 (Figures 1 and 2, pages 1 and 2) JP-A-2005-172017 (FIGS. 1 to 3, paragraph numbers 0007 to 0016) Utility Model Registration No. 256930 (Figures 1-8, paragraphs 0021-0043)

In the first prior art, when the elastic ring is deformed by water pressure, the elastic ring is elastically deformed to the commutator side, and the passage opening that is a gap between the elastic ring and the commutator is narrowed, and according to the cross-sectional area of the passage opening A high flow rate.
In addition, a protrusion for preventing excessive deformation of the elastic ring is provided so that a predetermined flow rate can be obtained even when excessive pressure is applied.
In order to obtain a predetermined flow rate, the protrusion amount of the protrusion becomes a problem. Therefore, it is necessary to perform trial manufacture and experiment of various dimensions and set the protrusion amount, which is not easy.

Similarly to the first prior art, the second conventional device also has an isosceles triangular flow restricting passage formed between the protrusions, with the elastic member deformed to the commutator side in proportion to the liquid pressure. The flow rate is reduced by reducing the cross-sectional area.
For this reason, for example, in order to attach a water faucet and obtain a predetermined flow rate, a predetermined cross-sectional area must be ensured, and thus there is a problem that the size must be increased. In order to avoid an increase in size, when the gap between the protrusions is increased to ensure the cross-sectional area of the flow path, there is a problem that the rectifying effect becomes insufficient and the outflow water from the faucet is scattered.

In the third conventional apparatus, the elastic ring is elastically deformed toward the commutator in proportion to the pressure of the liquid as in the first conventional technique, thereby reducing the cross-sectional area of the flow path and the flow rate.
The deformation amount of the elastic ring is restricted to a predetermined amount by the small protrusions, thereby ensuring a predetermined flow path cross-sectional area.
In this third conventional device, since the flow rate is defined by the protrusion amount of the small protrusion, in order to obtain a predetermined flow rate, it is necessary to perform trial manufacture and experiment of various dimensions and set the protrusion amount. There is not a problem.
Furthermore, it is difficult in manufacturing to make the protrusion amounts of the small protrusion and the large protrusion different from each other, and there is a problem that the manufacturing cost becomes high.

A first object of the present invention is to provide a constant flow device capable of easily obtaining an outflow amount of a predetermined flow rate even when the supply side hydraulic pressure fluctuates.
The second object of the present invention is to provide a constant flow rate device that can easily obtain a spilled amount of a predetermined flow rate and obtain a rectified spilled water even when the supply side hydraulic pressure fluctuates. It is to be.
The third object of the present invention is that it is possible to easily obtain a flow rate of a predetermined flow rate and to obtain a rectified effluent water even when the supply side hydraulic pressure fluctuates. To provide a constant flow rate device capable of obtaining a predetermined flow rate of effluent water.
The fourth object of the present invention is to easily obtain a predetermined flow rate even when the supply side hydraulic pressure fluctuates, to obtain a rectified effluent, and to a different flow rate. When setting, it is providing the constant flow apparatus which can be changed easily and cheaply.

In order to achieve this object, the present invention is configured as follows.
A cylindrical commutator is disposed at the center, a cylindrical side wall is disposed concentrically with the commutator, and a cylindrical livestock fluid portion is configured between the commutator and the side wall, In the constant flow rate device in which an elastic ring is arranged in the part, a collar part is formed at the inflow side end of the commutator, and a circular rectification hole is formed in the collar part concentrically with the commutator and communicates with the livestock part. Provided at intervals, provided on the outer peripheral surface of the commutator downstream of the commutation hole is provided with a semicircular commutation groove extending in parallel with the commutator axis and located on the extension of the commutation hole, The outer peripheral surface between the commutation grooves is formed by an arc surface centering on the axis of the commutator, and is close to the end of the commutator on the side opposite to the flange portion and between the commutators. The stopper which comprises the outflow port which has a channel cross-sectional area smaller than the channel cross-sectional area of a stock solution part is arranged, and the elastic ring is the above-mentioned Place the 畜液 portion in close contact with the peripheral surface, wherein the elastic ring is a constant flow device, wherein a resilient ring having a predetermined hardness in response to the flow rate are selectively attached.
The invention according to claim 2 is the constant flow rate device according to claim 1, wherein the elastic ring is colored in different colors according to hardness.
The invention of claim 3 comprises a cylindrical commutator disposed in the center, a cylindrical side wall disposed concentrically with the commutator to form a cylindrical livestock fluid portion, and elastic to the livestock fluid portion. In the constant flow device having a ring, the constant flow device comprises a bottomed cylindrical valve body and a commutator with a flange, and an outlet hole having a smaller diameter than the side wall is concentric with the side wall at the bottom of the valve body. Forming a first diameter portion having a diameter larger than that of the side wall on the opposite end surface of the valve body. Forming a first step portion that forms a step with a side wall, the flange portion of the commutator is circular, and a plurality of circular rectification holes concentrically communicating with the livestock fluid portion concentrically with the commutator are formed, The commutator extends in parallel with the commutator axis on the outer peripheral surface of the commutator on the downstream side of the commutation hole and the commutator. A commutation groove having a semicircular cross section is formed on the extension of the hole, and the outer peripheral surface of the commutator between the commutation grooves is formed by an arc surface centering on the axis of the commutator, The flange portion is applied to the first step portion and the periphery of the flange portion is brought into close contact with the inner surface of the first diameter portion to position the commutator with respect to the valve body. In this state, the front end of the commutator is the stopper. And the tip of the outer peripheral surface of the commutator between the rectifying grooves overlaps with the outflow hole, the elastic ring is disposed in the livestock fluid portion in close contact with the outer peripheral surface of the commutator, and the elastic ring is An elastic ring having a predetermined hardness corresponding to the flow rate is selectively mounted, and the elastic ring is deformed by the hydraulic pressure toward the center of the commutator to thereby define a flow defined by the rectifying groove and the elastic ring. Depending on the road cross section Is a constant flow device which is characterized in that for regulating a constant flow rate.

According to the invention of claim 1, after the liquid passes through the circular rectifying hole and continues to the rectifying hole and progresses to the rectifying groove having a semicircular cross section, the liquid flows through the flow regulating passage defined by the elastic ring and the rectifying groove. And flows out of the outlet.
As a result, the liquid is first rectified by the circular rectification hole. Next, the rectification state is maintained while the rectification state is maintained by the semicircular rectification groove positioned on the extension of the rectification hole.
Then, the liquid whose flow rate is regulated by the flow rate regulating passage defined between the elastic ring and the rectifying groove flows out from the outlet. Therefore, rectified running water can be obtained from the outlet.
In addition, since the outlet formed by the stopper and the rectifying body is extremely small with respect to the total cross-sectional area of the rectifying hole, the elastic ring positioned in the livestock fluid portion receives a force that is crushed in response to the pressure of the liquid.
At this time, since the outer periphery of the elastic ring is restricted by the side wall and the inner periphery is restricted by the arcuate peripheral surface of the commutator, the portion facing the rectifying groove not subject to the restriction is deformed toward the bottom side of the rectifying groove. Is done.
As a result, the flow restriction passage is narrowed according to the pressure of the liquid and based on the hardness of the selected elastic ring.
At this time, since the elastic ring is supported by the outer peripheral surface, the deformation amount of the portion facing the rectifying groove is limited.
More specifically, since the elastic ring is supported on both sides of the rectifying groove by the circular arc surface of the outer peripheral surface, it is difficult to deform and the deformation amount can be regulated relatively easily. In other words, the deformation amount of the elastic ring can be regulated without providing a support in the middle.
Therefore, since the commutator can be formed relatively easily, a low-cost constant flow device can be obtained.
And the liquid of the predetermined flow volume based on the cross-sectional area of the flow control path defined by the elastic ring and the rectifying groove having a semicircular cross section flows out from the outlet.
Even if there is a change in pressure in the liquid on the supply side, the change in the deformation amount of the elastic ring is small and a substantially the same outflow amount can be obtained.
When changing the outflow flow rate, it is only necessary to replace the elastic ring with a different hardness, so that it can be changed easily and inexpensively.
As in claim 2, when the elastic ring is colored in different colors depending on its hardness, in addition to the effect of claim 1, it is possible to set the outflow flow rate by selecting the color, thus preventing missetting of the flow rate. it can.
When configured as in claim 3, in addition to the effect of claim 1, there is an advantage that manufacture is easy and manufacture can be made at low cost.

FIG. 1 is a perspective view of a water tap to which a constant flow device according to the present invention is attached. FIG. 2 is a plan view of Example 1 of the constant flow device according to the present invention. FIG. 3 is a bottom view of Example 1 of the constant flow device according to the present invention. FIG. 4 is a valve body of Example 1 of the constant flow device according to the present invention, (A) is a plan view, and (B) is a cross-sectional view along the line AA. FIG. 5 is a plan view of the commutator of Embodiment 1 of the constant flow device according to the present invention. FIG. 6 is a commutator of Embodiment 1 of the constant flow device according to the present invention, (A) is a bottom view, and (B) is a front view. 7 is a constant flow rate apparatus according to the first embodiment of the present invention, in which (A) is a sectional view taken along line BB in FIG. 2, and (B) is a sectional view taken along line CC. FIG. 8 is an elastic ring of Example 1 of the constant flow device according to the present invention, in which (A) is a plan view and (B) is a sectional view taken along the line DD. FIG. 9 is an operation explanatory diagram of Embodiment 1 of the constant flow device according to the present invention. FIG. 10 is a bottom view of the commutator of Embodiment 2 of the constant flow device according to the present invention. FIG. 11 is a cross-sectional view taken along the line EE in FIG.

  In an embodiment of the present invention, a cylindrical commutator is disposed at the center, a cylindrical side wall is disposed concentrically with the commutator, and a cylindrical animal liquid is disposed between the commutator and the side wall. In the constant flow rate device comprising an elastic ring in the livestock fluid part, a collar part is formed at the upstream end of the commutator, and the livestock part is concentrically with the commutator in the collar part. Circular cross-sections that communicate with each other at equal intervals, a cross-section that extends parallel to the axis of the commutator on the outer peripheral surface of the commutator downstream of the commutator and is positioned on the extension of the commutator A semicircular rectifying groove is provided, and the flow regulating path is constituted by the rectifying groove and the elastic ring, and the outer peripheral surface between the rectifying grooves is connected by an arc surface centering on the axis of the commutator, From the flow path cross-sectional area of the flow restriction passage between the commutator and the end of the commutator on the side opposite to the flange The stopper which comprises the outflow port which has a small channel cross-sectional area is arrange | positioned, the said elastic ring is arrange | positioned in the said stock solution part in the state of contact | adherence to the said circular arc surface, and the said elastic ring has the elasticity which has predetermined hardness according to a flow The constant flow device is characterized in that a ring is selectively attached.

The constant flow device 100 is attached to the beginning, middle, or end of the liquid introduction pipe and has a function of making the amount of liquid outflow constant regardless of the liquid pressure on the supply side.
The first embodiment is an example in which a constant flow valve 102, which is a constant flow device 100 according to the present invention, is attached to a tap faucet 104.
In FIG. 1, water can flow out from the faucet 104 by turning the handle 106 counterclockwise, and flow out can be blocked by turning clockwise.
The constant flow valve 102 according to the present invention is attached to the tip of the faucet 104 and has a function of regulating the amount of effluent water to a predetermined flow rate.
The constant flow valve 102 can also be disposed at the base or middle of the faucet 104.
In the case where the constant flow valve 102 is attached to the tip of the faucet 104, it can be retrofitted to the faucet 104, and there is an advantage that it can be adapted later to the recent water saving orientation.

Next, an outline of the constant flow valve 102 will be described with reference to FIG.
The constant flow valve 102 has a function of making the flow rate on the discharge (outflow) side substantially constant even if the liquid pressure on the inflow (supply) side fluctuates.
The constant flow valve 102 includes a valve body 112, a commutator 114 and an elastic ring 116, and the commutator 114 and the elastic ring 116 are incorporated in the valve body 112.

First, the valve body 112 will be described mainly with reference to FIG.
The valve body 112 has a function of being attached to the start end, the middle or the end of a water faucet, etc., and a function of holding the commutator 114 and the elastic ring 116 to restrict the flow rate from the outflow hole 118 to a predetermined flow rate.
The valve body 112 has a cylindrical shape, and the inflow side 120 has a stepped cylindrical shape with a larger diameter than the outflow side 122.
More specifically, the valve body 112 has a first diameter portion 124 formed in a circular hole having the largest first diameter D1 on the inflow side 120, and the outflow side 122 of the first diameter portion 124 is larger than the first diameter D1. A second diameter portion 126 formed in a circular hole having a small second diameter D2, and a third diameter D3 having a smaller diameter than the second diameter D2 formed in the circular hole on the outflow side 122 of the second diameter portion 126. A third diameter portion 128 is located.
In other words, the first step portion 132 for regulating the position of the commutator 114 is formed between the first diameter portion 124 and the second diameter portion 126, and the second diameter portion 126 and the third diameter portion 128 are formed. Is formed with a second step portion 134 for restricting the position of the elastic ring 116.
The second step portion 134 is a stopper 135 that regulates the position of the elastic ring 116.

The first diameter portion 124 is circular and has a first side wall 136 having a first height H1, and the second diameter portion 126 is circular and has a second side wall 138 having a second height H2. It is circular and is surrounded by a third side wall 140 having a third height H3.
Therefore, the outflow hole 118 is the third diameter portion 128.
The valve body 112 is preferably made of a metal such as stainless steel or brass.
This is to avoid breakage due to high pressure liquid and breakage due to mounting.
However, the valve body 112 can be manufactured from a material other than a metal such as a resin.
An outer peripheral step portion 142 facing the first step portion 132 of the valve body 112 is used for mounting on a case 144 to be attached to the faucet 104.

Next, the commutator 114 will be described mainly with reference to FIGS.
The commutator 114 has a function of rectifying the liquid flowing from the inflow side 120 to the outflow side 122 and restricting the deformation amount of the elastic ring 116.
The commutator 114 has a cylindrical shape with a flange made up of a flange portion 146 and a cylindrical portion 148, wherein the flange portion 146 has a flow straightening hole 152 and the columnar portion 148 has a flow straightening groove 154.
The flange 146 is located on the inflow side 120 of the commutator 114, has a fourth diameter D4 that is slightly smaller than the first diameter D1 and larger than the second diameter D2, and that is greater than the first height H1. Is a disk shape having a slightly lower fourth height H4.
In the flange portion 146, a rectifying hole 152 having a predetermined diameter D5 that penetrates from the inflow side 120 to the outflow side 122 and has a second axis SL2 parallel to the first axis SL1 of the flange portion 146 has a predetermined first radius R1. A plurality are formed at predetermined equal intervals around the first virtual circle VC1.
In the first embodiment, the diameter of the rectifying holes 152 is about 1.5 mm, and 12 pieces are arranged at intervals of 30 degrees.

The cylindrical part 148 is continuously arranged on the outflow side 122 with respect to the flange part 146, has the same first axis SL1 as the flange part 146, and has a cylindrical shape.
The rectifying groove 154 is formed in an arc shape with the same radius as the rectifying hole 152 around the second axis SL2 on the circumferential surface of the cylindrical portion 148, and the end 122 on the outflow side of the cylindrical portion 148 along the second axis SL2. The cross section extending to the part is a semicircular groove.
In other words, the rectifying groove 154 is a groove having a semicircular cross section that extends along the second axis SL2 continuously to the rectifying hole 152.
Therefore, a partition wall 156 that partitions the rectifying grooves 154 is formed.
In other words, twelve rectifying grooves 154 and partition walls 156 extending along the second axis SL2 are arranged on the circumferential surface of the cylindrical portion 148 at equal intervals.
The outer peripheral surface 158 of the partition wall 156 is formed as an arc surface located on the second virtual circle VC2 having a predetermined second radius R2 with the first axis SL1 as an axis.
In other words, the sixth diameter D6, which is the diameter of the cylindrical portion 148, is slightly smaller than the second diameter D2 and larger than the third diameter D3.
Since the second radius R2 is slightly larger than the radius R1 of the first virtual circle VC1 where the second axis SL2 of the rectifying hole 152 is located, the sectional shape of the rectifying groove 154 is precisely adjacent to the release portion 162 of the rectifying groove 154 Since the inward wall surfaces 164L and 164R exist (see FIG. 9), the cross section is closer to a circle than a semicircle. Thereby, there is a further rectifying effect.
The distance D7 between the groove bottom portions 166 located on the diagonal line passing through the axis SL1 of the rectifying groove 154 is smaller than the third diameter D3.
As a result, the outlet 172 is formed in cooperation with the outflow hole 118.

Next, the elastic ring 116 will be described with reference to FIG.
The elastic ring 116 is deformed by the hydraulic pressure supplied to the inflow side 120, and has a function of regulating the outflow flow rate from the outflow hole 172 to a predetermined flow rate even when the supply pressure of the inflow side 120 changes.
The elastic ring 116 is formed of a resin such as synthetic rubber or polytetrafluoroethylene.
Therefore, a commercially available O (O) ring having a predetermined diameter is preferable. This is because it can be purchased at a low price.
The material of the elastic ring 116 is selected so as not to be adversely affected by the supply liquid such as deterioration.
The elastic ring 116 is set to have a predetermined hardness according to the outflow rate from the outflow port 172.
For example, when the outflow rate is 11 liters / min, an O-ring having a hardness of Hs90 that is generally sold is selected. Therefore, when the outflow rate is 6 liters / minute, an O-ring having a lower hardness is selected, and when it is 4 liters / minute, an O-ring having a lower hardness is selected.
The elastic rings 116 having different hardnesses are preferably colored in different colors for each hardness. This is because the hardness can be understood by identifying the coloring, and an appropriate elastic ring 116 corresponding to the flow rate can be definitely attached.
For example, when the outflow rate is 6 liters / minute, it is colored blue, when it is 4 liters / minute, it is white, when it is 8 liters / minute, it is colored red, and when it is 10 liters / minute, it is colored yellow.
It is preferable that the elastic ring 116 used for the flow rate with the highest demand is colored black. This is because black is the cheapest and can be provided to users at a low price.
In this way, the outflow flow rate can be changed only by replacing the elastic ring 116 by changing the outflow flow rate by changing the elasticity of the elastic ring 116. There are advantages you can do.

The elastic ring 116 has an eighth diameter D8 that is a predetermined diameter, and the ninth diameter D9 of the inner diameter of the ring is formed to a size that can be fitted to the cylindrical portion 148 of the commutator 114 with a small force.
In other words, the ninth diameter D9 is set slightly smaller than the sixth diameter D6, and the elastic ring 116 is fitted and integrated with the cylindrical portion 148. This is to prevent the elastic ring 116 from being accidentally lost.
The tenth diameter D10 of the outer diameter of the elastic ring 116 is set to be slightly smaller than the second diameter D2, and is formed to a size that can be easily inserted into the second diameter portion 126 of the valve body 112.
Preferably, the elastic ring 116 is formed so that a slight gap is formed between the outer peripheral surface of the elastic ring 116 and the second wall surface 138.
This is for facilitating mounting on the valve body 112 and stabilizing the outflow rate.

Next, a structure in which the valve body 112, the commutator 114 and the elastic ring 116 are combined to form the constant flow valve 102 will be described with reference to FIGS.
The constant flow valve 102 has a function of keeping the flow rate on the outflow side 122 constant even when the fluid pressure on the inflow side 120 changes.
The commutator 114 is attached to the valve body 112 in a state where the elastic ring 116 is fitted to the cylindrical portion 148 of the commutator 114 (FIG. 6B).
That is, the lower surface of the flange portion 146 of the commutator 114 is locked to the first step portion 124.
In this state, the cylindrical portion end 168 on the outflow side 122 of the cylindrical portion 148 is close to the second step portion 134 and is substantially in contact therewith.
Specifically, as shown in FIG. 7, the outer peripheral surface 158 is opposed to the second side wall 138 and is located immediately above the second step portion 134, and the groove bottom portion 166 of the rectifying groove 154 is opposed to the second step portion 134. Relative to the outflow hole 118.
More specifically, as shown in FIG. 3, twelve bottom-shaped outlets 172 are formed in a ring shape at equal intervals by the groove bottom portion 166 and the outflow hole 118 of the rectifying groove 154.
The upper surface of the flange 146 is slightly recessed from the end surface of the inflow side 120 of the valve body 112.

A gap D11 is formed between the second side wall 138 and the outer peripheral surface 158, and a ring-shaped livestock portion 174 is formed around the cylindrical portion 148.
A flow regulating passage 176 having a semicircular cross section is formed by the inner peripheral edge of the elastic ring 116 and the rectifying groove 154.
Here, the flow passage cross-sectional area is smaller in the order of the circular flow straightening hole 152, the flow restriction passage 176 having a semicircular cross section, and the outlet 172 having a ship bottom shape.
The rectifying hole 152 and the rectifying groove 154 have the same radius, the flow restricting passage 176 is closed about half of the rectifying hole 152 by the elastic ring 116, and the outlet 172 is connected to the flow restricting passage 176 by the second step portion 134. Because about one-fifth is blocked.

For example, the channel cross-sectional area of the outlet 172 is set to about one tenth of the channel cross-sectional area of the rectifying hole 152.
Further, when the pressure liquid is supplied, the elastic ring 116 is moved to the outflow side 122 and takes a position locked to the second step portion 134 as shown in FIG. 7 (B).
As a result, the stock solution portion 174 becomes a space formed between the elastic ring 116 and the collar portion 146.
Since the flow path cross-sectional area of the outlet 172 is small, the water flowing in from the rectifying hole 152 stays in the livestock fluid part 174 and presses the elastic ring 116 from the inflow side 120.
As a result, the elastic ring 116 is restricted from being deformed in the diameter increasing direction by the second side wall 138, and is restricted from being deformed in the diameter reducing direction by the outer peripheral surface 158 of the cylindrical portion 148. Only can be deformed in the reduced diameter direction.
The flow rate from the outlet 172 is determined by the amount of water passing through the flow rate restricting passage 176 formed by the deformation of the elastic ring 116 in the diameter reducing direction.

Next, the operation of the constant flow valve 102 will be described with reference to FIG.
A pressure liquid, in this embodiment tap water, is supplied to the inflow side 120.
The supplied tap water flows into the flow straightening hole 152, proceeds to the flow straightening groove 154, travels through the flow regulating passage 176 defined by the elastic ring 116 and the flow straightening groove 154, and then flows out through the outlet 172. The air is rectified from the hole 118 and flows out.
Furthermore, as described above, since the channel cross-sectional area of the outlet 172 is the smallest, the tap water flowing in from the rectifying hole 152 stays in the ring-shaped livestock fluid part 174, and in the livestock fluid part 174, the inflow side 120 The pressure is about the same as the water pressure supplied to.
This is because the flow passage cross-sectional area of the outlet 172 is extremely small, about one tenth of the flow passage cross-sectional area of the rectifying hole 152.

As a result, an external force is also applied to the elastic ring 116 located in the livestock fluid part 174 by the water pressure accumulated in the livestock fluid part 174.
The elastic ring 116 cannot be deformed in the reduced diameter direction at the portion supported by the outer peripheral surface 158 of the cylindrical portion 148.
Further, since the outer periphery is restricted by the second side wall 138 in the diameter expansion direction, it cannot be deformed.
Only at the portion facing the straightening groove 154 that cannot be supported at all, it is possible to deform toward the groove bottom 166 that is the direction of diameter reduction.
More specifically, the elastic ring 116 is deformed toward the groove bottom 166 in response to the supply water pressure, and as a whole, is deformed into a corrugated ring shape as shown in FIG.
Accordingly, water having a flow rate corresponding to the flow passage cross-sectional area of the flow restriction passage 176 defined by the deformed elastic ring 116 and the rectifying groove 154 advances to the outlet 172 side.
Since the flow path cross-sectional area of the outlet 172 is extremely small, it is understood that the water pressure in the livestock fluid part 174 is close to the supply water pressure.
In other words, it is considered that when the water pressure on the inflow side 120 increases, the deformation amount of the elastic ring 116 increases and the flow path cross-sectional area of the flow restriction passage 176 decreases.

On the other hand, in the flow restricting passage 176, since there is an outflow from the outlet 172, the water pressure does not increase up to the supply water pressure, and the flow rate is determined according to the cross-sectional area and flow velocity in the flow restricting passage 176. It is done.
Here, since the channel cross-sectional area of the outlet 172 is about one-fifth of the channel cross-sectional area of the flow restricting passage 176, it is considered that there is almost no change in the flow velocity at the outlet 172.
Then, it is considered that the outflow rate from the outflow port 172 is determined by the cross-sectional area of the flow rate regulating passage 176.
In other words, it is considered that the outflow rate from the outflow port 172 is determined according to the deformation amount of the elastic ring 116.
Therefore, even when the pressure of the liquid applied to the inflow side 120 fluctuates, by appropriately selecting the hardness of the elastic ring 116, the flow path cross-sectional area corresponding to the pressure can be regulated. The outflow flow rate can be made constant.

In particular, in the present invention, since the outer peripheral surface 158 of the cylindrical portion 148 that supports the elastic ring 116 is an arc surface centered on the first axis SL1 of the cylindrical portion 148, the manufacturing is easy and the manufacturing is inexpensive. Can do.
Further, when the elastic ring 116 is deformed toward the groove bottom 166, as shown in FIG. 9, the end of the outer peripheral surface 158 that supports the elastic ring 116 is hardly rounded, so that the elastic ring 116 is hardly deformed. .
As shown by the chain line in FIG. 9, when the tip of the projection is semicircular like a fingertip as in the prior art, there is an advantage that the elastic ring 116 is easily deformed, but it is difficult to regulate the amount of deformation. It is necessary to provide a small protrusion in the middle to regulate the deformation amount.

However, in the present invention, since the elastic ring 116 is not easily deformed as described above, the deformation amount can be regulated without providing a small protrusion.
Therefore, even if the pressure on the supply side changes, the change in the deformation amount of the elastic ring 116 is small, so that the flow rate on the outflow side is substantially constant.
Therefore, there is an advantage that the outflow rate can be made constant even at different supply fluid pressures.
Furthermore, even if the supply side hydraulic pressures are different, the outflow flow rate is constant, so that there is an advantage that water can be saved (liquid).
Further, when it is desired to change the outflow flow rate, it is only necessary to change only the elastic ring 116 to an elastic ring having a different hardness, so that there is an advantage that it can be easily changed at low cost.

Next, Example 2 will be described with reference to FIGS.
Example 2 is a useful embodiment when the flow rate per predetermined time is increased using the commutator 114 having the same shape as that of Example 1.
The same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different structures are described.

As shown in FIG. 10, the second outer peripheral surface 182 of some of the partition walls 156 is formed on a third virtual circle VC3 having a third radius R3 smaller than the second radius R2 of the other outer peripheral surface 158. Example 1 is the same as Example 1.
The third radius R3 is smaller than the second radius R2. This is because even when the elastic ring 116 is deformed, a gap is formed between the inner edge of the elastic ring 116 and the second outer peripheral surface 182 to increase the outflow rate.
Specifically, four second outer peripheral surfaces 182 are formed at intervals of 90 degrees.
In other words, after the two outer peripheral surfaces 158 are formed, one second outer peripheral surface 182 is formed.

Next, the operation of the second embodiment will be described.
An operation different from that of the first embodiment will be described.
In Example 2, even when the elastic ring 116 is deformed to the cylindrical part 148 side by the hydraulic pressure of the stock solution part 174, it is considered that the inner edge does not contact the second outer peripheral surface 182.
When the elastic ring 116 does not contact the second outer peripheral surface 182, the adjacent flow restriction passages 176 communicate with each other, and the flow passage cross-sectional area of the flow restriction passage 176 increases substantially.
As a result of the increase in the cross-sectional area of the flow path, it is considered that the outflow flow rate increases even if the hydraulic pressure in the flow restriction passage 176 increases and the cross-sectional area of the flow outlet 172 does not increase.
Therefore, there is an advantage that the flow rate can be increased with a very simple configuration.

  The constant flow valve 102 according to the present invention is not limited to the flow rate control in the water supply of the embodiment, for example, when injecting a certain amount of juice or liquid seasoning into the bottle, or in one liquid to another liquid It can be used when it is desired to keep the flow rate of the liquid constant, such as when mixing a certain amount of.

112 Valve body
114 Commutator
116 Elastic ring
118 Outflow hole
120 Inflow side
124 1st diameter part
132 1st stage
134 Second stage
135 Stopper
138 Second side wall
146 Buttocks
152 Rectification hole
154 Rectifier groove
158 Outer surface
168 edge
172 outlet
174 Stock solution
182 Second outer peripheral surface
SL1 axis 1

Claims (3)

A columnar commutator (114) is disposed in the center, and a cylindrical side wall (138) is disposed concentrically with the commutator (114) so that the commutator (114) and the side wall (138) In the constant flow rate device comprising a cylindrical livestock part (174) between them and arranging an elastic ring (116) in the livestock part (174),
Forming a flange (146) at the inflow side (120) end of the commutator (114);
Circular rectification holes (152) communicating with the livestock fluid part (174) concentrically with the commutator (114) are provided at equal intervals in the collar part (146),
The commutator (114) on the downstream side of the commutator hole (152) extends parallel to the axis (SL1) of the commutator (114) on the outer peripheral surface of the commutator (114), and on the extension of the commutator hole (152). Provide a semicircular rectifying groove (154) that is located,
The outer peripheral surface (158) between the rectifying grooves (154) is formed by an arc surface centered on the axis (SL1) of the commutator (114),
It is closer to the end (168) of the commutator (114) on the opposite side of the flange (146) and between the commutator (114) than the cross-sectional area of the flow path of the livestock part (174). A stopper (135) constituting an outlet (172) having a small channel cross-sectional area is arranged,
The elastic ring (116) is disposed in the stock solution part (174) in close contact with the outer peripheral surface (158),
The constant flow device, wherein the elastic ring (116) is selectively mounted with an elastic ring having a predetermined hardness corresponding to the flow rate.   2. The constant flow rate device according to claim 1, wherein the elastic ring is colored in different colors according to hardness. A cylindrical commutator (114) is disposed in the center, and a cylindrical side wall (138) is disposed concentrically with the commutator to constitute a cylindrical livestock fluid part (174), and the livestock fluid part In the constant flow device in which the elastic ring (116) is arranged in (174),
The constant flow device comprises a bottomed cylindrical valve body (112) and a commutator with a flange (114),
A second outflow hole (118) smaller in diameter than the side wall (138) is formed concentrically with the side wall (138) at the bottom of the valve body to connect the side wall (138) and the outflow hole (118). The side wall is formed by forming a step (134) as a stopper (135) and forming a first diameter portion (124) having a diameter larger than that of the side wall (138) on the end surface on the opposite side of the valve body (112). Forming a first step (132) that is stepped with (138),
The flange portion (146) of the commutator is circular and a plurality of circular rectification holes (152) communicating with the livestock fluid portion (174) concentrically with the commutator (114) are formed at equal intervals. The commutator (114) on the downstream side of the commutation hole (152) extends in parallel with the axis (SL1) of the commutator (114) on the outer peripheral surface of the commutator (114) and is semicircular in cross section on the extension of the commutation hole (152) Current commutation grooves (154) are formed, and the outer peripheral surface (158) of the commutator (114) between the commutation grooves (154) is an arc surface centered on the axis (SL1) of the commutator (114). Formed,
The commutator is provided with the flange (146) of the commutator (114) being applied to the first step portion (132) and the periphery of the flange (146) being in close contact with the inner surface of the first diameter portion (124). In this state, the commutator tip (168) is adjacent to the stopper (135) and the outer peripheral surface of the commutator (114) between the commutation grooves (154). The tip overlaps the outflow hole (118),
The elastic ring (116) is disposed in the livestock fluid part (174) in close contact with the outer peripheral surface (158) of the commutator (114),
The elastic ring (116) is selectively mounted with an elastic ring having a predetermined hardness corresponding to the flow rate,
The elastic ring (116) is deformed in the central direction of the commutator (114) by a hydraulic pressure, whereby a predetermined cross-sectional area is defined by the flow passage cross section defined by the rectifying groove (154) and the elastic ring (116). A constant flow rate device that regulates the flow rate.

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