JP2569730Y2 - Flow control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control device which is disposed in a flow path and can ensure a substantially constant flow rate of outflow fluid from a low pressure to a high pressure.

[0002]

2. Description of the Related Art Conventionally, there has been disclosed a flow control device which is disposed in a flow path such as a pipe or the like to ensure a substantially constant outflow flow rate regardless of the pressure of a flowing fluid. 7 is known.

That is, the conventional flow control device shown in FIGS. 6 and 7 is composed of a case 21, a core 22, and an O-ring 23.

The case 21 has a cylindrical shape,
A disk-shaped upright portion 24 is integrally provided on the inner surface of the other end portion,
A small-diameter opening 25 is formed in the upright portion 24, while
A step 27 is formed at one end of the case 21 on the side of the large-diameter opening 26 between the case 21 and the center.

[0005] The core 22 is disposed inside the case 21, and the lower part 28 is provided in the case 2.
An annular base 29 having a size that can be fitted to the step 27 of the large-diameter opening 26 and having a predetermined distance from the center on the upper surface of the lower part 28, And is higher than the platform 29,
A core portion 30 that can be arranged inside the case 21, and a tip portion protrudingly provided at a center portion of the core portion 30, and a distal end portion thereof extends outward through an opening 25 of an upright portion 24 at the other end portion of the case 21. The projection 31 having a protrudable height is integrally formed.

The core 30 of the core 22 projects horizontally at 90 ° intervals as shown in FIG.
Large protruding part 32 which protrudes greatly so as to approach 9
And small protruding portions 33 (three shown in the figure) which protrude horizontally in the horizontal direction at a predetermined interval between the large protruding portions 32.

Further, the O-ring 23 has an outer peripheral surface in contact with a central portion of an inner surface of the cylindrical case 21.
The inner peripheral surface is sized to be horizontally separated from the tips of the four large protrusions 32.

When assembling the case 21, the core 22, and the O-ring 23 configured as described above, first, the O-ring 23 is located on the upper surface of the core 22. Then
This ring 23 is placed on the upper surface of a base 29 provided integrally with the upper surface of the core 22. Is movable eccentrically in the horizontal direction within a range in which it comes into contact with the side surface of the front end.

As described above, the O-ring 2
3 is inserted into the case 21 with the O-ring 23 facing upward from the large-diameter opening 25 side. As a result, the lower portion 28 of the core 22 is
The core 22 is fixed to the case 21 while being fitted into the opening 26 of the case 22 in a state where the core 22 contacts the case 7.

Therefore, in this assembled state,
The O-ring 23 is held in a state where its outer peripheral surface is in contact with the center of the inner surface of the case 21, and the O-ring 23 is provided with a protrusion 31 protruding from the center of the core 30 of the core 22.
The leading end portion projects outward through an opening 25 provided in the first standing portion 24.

[0011] The flow control device incorporated as described above is
The fluid in the pipe is located inside the pipe,
8, the relationship between the pressure of the flowing fluid and the flow rate flowing through the flow rate adjusting device is as shown in FIG. In addition, the side surface of the distal end portion of each of the large protruding portion 32 and the small protruding portion 33 provided on the core portion 30 of the core 22,
An opening area formed between the O-ring 23 and the inner peripheral surface is set, and the flow rate flowing through the flow rate adjusting device is set to a predetermined flow rate in advance, for example, 10 liter / m in FIG.
It is assumed to be set to be in.

When the pressure of the fluid in the pipe is increased, the relationship between the pressure and the flow rate first becomes as shown by A, and when the pressure is reduced after reaching the maximum pressure, the relationship becomes B. As shown.

That is, the O-ring 23 is deformed inward by the pressure of the fluid to change the opening area, and this change is made in response to the pressure. Although a substantially constant flow rate (10 liters / min) can be obtained irrespective of the pressure, hysteresis occurs between the flow rate at the time of pressure increase and the flow rate at the time of pressure decrease at the time of low pressure. Had become a problem.

As a result of various studies by the inventor of the present invention as to the cause of the excessive flow rate, it was concluded that the O-ring was caused by irregular deformation or movement. That is, when the O-ring is deformed inward due to the fluid pressure, the O-ring axis is inclined with respect to the core axis instead of being deformed with the axis of the O-ring coinciding with the axis of the core. Or deformed by being displaced in parallel.

This invention solves the above-mentioned problems of the prior art, and prevents the occurrence of hysteresis in the flow characteristics, especially at low pressure, so that the flow rate is always substantially constant regardless of the fluid pressure. It is an object of the present invention to provide a flow control device which can ensure the flow rate.

[0016]

In order to achieve the above object, the present invention is directed to a core having an annular elastic member provided at a predetermined distance from an outer peripheral surface inside a cylindrical case. There is disposed, fluid flowing from one opening of the case, through the cavity formed between said core and the elastic member flows out from the other opening, this time, the fluid flowing The elastic member is deformed in response to pressure to change the area of the space, thereby obtaining a substantially constant flow rate regardless of the inflowing fluid pressure, wherein the core, In the direction perpendicular to the axis on the circumference
Four large projections projecting equally and adjacent large projections
Projected evenly between them and more central than both sides
And three small protrusions that are larger
Having the elastic member between the tip side surfaces of the large projections.
While supporting, each large projection and each small projection and elasticity
The means that formed the space between the member and
is there. In addition, the tip of the large protruding portion of the core is aligned with the axis.
It adopts a means that is inclined and tapered.
It is. Further, the elastic member is provided on the core.
Means clamped between a base and a standing part provided in the case
Is adopted.

[0017]

[0018]

[0019]

[Function] This invention adopts the above-mentioned means,
When the pressure fluid flows into the case, the fluid flows out through a space between the peripheral surface of the core and the elastic member. Also,
When the pressure of the inflowing fluid changes, the elastic member is deformed in accordance with the change, thereby changing the area of the void formed between the peripheral surface of the core and the elastic member, thereby changing the pressure of the inflowing fluid. Irrespective of the above, an almost constant flow rate always flows out of the case.

The elastic member, which deforms when the area of the space changes, is deformed with its axis aligned with the axis of the core. And the flow rate when the same pressure is reduced from a high pressure to a low pressure is almost the same, preventing the occurrence of hysteresis between the flow rate when the pressure is increased and the flow rate when the pressure is reduced at the same pressure. can do.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. FIGS. 1 and 2 show a flow control device according to the present invention. The flow control device includes a case 1, a core 2, and an O-ring 3.

The case 1 has a cylindrical shape, and a disk-shaped upright portion 4 is integrally provided on the inner surface of the other end portion. A small-diameter opening 5 is formed in the upright portion 4. A step 7 is formed at one end of the case 1 on the side of the large-diameter opening 6 between the case 1 and the center of the inner surface.

The core 2 is disposed inside the case 1, and has a size such that the lower portion 8 can be fitted into the step 7 of the large-diameter opening 6 of the case 1. On the upper surface of the lower part 8, an annular base 9 at a predetermined distance from the center, and located on the center side of the base 9 and higher than the base 9, A core 10 that can be disposed inside the case 1 and a tip protruding from the center of the core 10 and projecting outward through an opening 5 of an upright portion 4 at the other end of the case 1 The projections 11 having different heights are integrally formed.

As shown in FIG. 2, the core portion 10 of the core 2 projects in the horizontal direction at 90 ° intervals, and has a large protruding portion 12 having a large end protruding so as to approach the base 9. Small protruding portions 13 (three shown in the figure) are provided between the protruding portions 12 so as to protrude in the horizontal direction at predetermined intervals.
The large protruding portion 12 is formed in a tapered shape in which the side face goes upward and goes toward the center.

The one shown in FIG.
Are provided at 30 ° intervals, and the central small projection 13a, that is, the small projection 13a located at the center between the large projections 12 projecting at 90 ° intervals, It projects larger than the small protrusion 13.

Further, the O-ring 3 has such a size that its inner peripheral surface is in contact with the tapered side surface of the four large protruding portions 12, and its outer peripheral surface is the inner surface of the cylindrical case 1. The size is more inwardly spaced than the center.

When assembling the case 1, the core 2 and the O-ring 3 configured as described above, first, the O-ring 3 is located on the upper surface of the core 2. Then, as shown in FIG. 2, the O-ring 3 is held by the core 2 in a state in which the O-ring 3 is in contact with the upper side surface of the tip of the four large projections 12 of the core 10 provided integrally on the upper surface of the core 2. Therefore, in this state, the O-ring 3 has its axis aligned with the core 2.
Is held in a state in which it coincides with the axis of.

After the O-ring 3 is positioned on the upper surface of the core 2 as described above, the core 2 is inserted into the case 1 with the O-ring 3 facing upward from the large-diameter opening 6 side. I do. Then, the lower portion 8 of the core 2 is fitted into the opening 6 of the case 1 with the upper surface thereof in contact with the step portion 7, and the core 2 is fixed to the case 1.

Therefore, in this assembled state,
The O-ring 3 has its inner peripheral surface supported on the upper portions of the side surfaces of the four large protruding portions 12 formed on the core portion 10 of the core 2, and its upper surface is in contact with the inner surface of the upright portion 4 of the case 1. The case 11 comes into contact with the core 11 of the core 2. The protrusion 11 protruding from the center of the core 10 extends outward through the opening 5 provided in the upright portion 4 of the case 1. It will be in a protruding state.

The flow rate adjusting device incorporated as described above is
When the fluid in the pipe is introduced from the large-diameter opening 6 side of the case 1 and located inside the pipe, the relationship between the pressure of the flowing fluid and the flow rate flowing through the flow rate adjusting device is shown in FIG. As shown. Note that the side surfaces of the leading end of each of the large projecting portion 12 and the small projecting portion 13 provided on the core portion 10 of the core 2 are
By setting a void area formed between the inner peripheral surface of the ring 3 and the flow rate flowing through the flow rate adjusting device, a predetermined flow rate, for example, 10 liter / min in FIG.
It should be set so that

When the pressure of the fluid in the pipe is increased, the relationship between the pressure and the flow rate first becomes as shown by A. When the pressure is reduced after reaching the maximum pressure, the relationship becomes B. As shown.

That is, due to the pressure of the fluid, the O-ring 3 is deformed inward to change the opening area, and this change is made in response to the pressure. Irrespective of the pressure, a substantially constant flow rate (10 liters / min) could be obtained, and the hysteresis generated between the flow rate at the time of pressure increase and the flow rate at the time of pressure decrease at a low pressure was very small.

As described above, when the O-ring 3 is deformed inward when the O-ring 3 is deformed inward, first, of the three small protruding portions 13a, 13 It contacts the small projection 13a located. Therefore, when the O-ring 3 is further deformed inward, only the portion located between each of the large protrusions 12 and each of the small protrusions 13a is deformed inward. O-ring 3
It is possible to prevent excessive deformation from occurring.

The reason why the hysteresis generated between the flow rate at the time of pressure increase and the flow rate at the time of pressure decrease at the time of low pressure is very small is that the axis of the core 2 and the O-ring This is because the operation is performed in a state where the axes 3 coincide with each other.

That is, when the O-ring is deformed inward due to the fluid pressure, the O-ring axis is not inclined or displaced parallel to the axis of the core unlike the conventional one. 4 corresponding to the pressure applied
Up and down while contacting the side of the tip of
The movement between the two large protruding portions is inwardly changed to change the opening area, and the O-ring is always deformed in a state where the axis of the O-ring is aligned with the axis of the core.

Therefore, it is possible to prevent an excessive flow rate at a low pressure, and it is possible to always maintain a substantially constant flow rate regardless of the fluid pressure.

FIG. 4 shows a main part of another embodiment of the flow control device according to the present invention. This embodiment shows that when the O-ring 3 is displaced, the axis of the O-ring 3 and the core 2 are moved.
An annular concave portion 15 for receiving the upper end of the O-ring 3 is formed on the inner surface of the upright portion 4 of the case 1 to prevent deviation from the axis of the core 1. When the height of the base 9 is increased and the core 2 is incorporated into the case 1, the O-ring 3 does not come into contact with the side surface of the distal end of the large protrusion 12, and the base 9 and the recess 15 The O-ring 3 is sandwiched between the two.

Even in the case of such a configuration, when the opening area is changed by the displacement of the O-ring 3 due to the pressure of the fluid, the axis of the O-ring 3 always coincides with the axis of the core 2. Because it can be maintained, the hysteresis that occurs between the flow rate at the time of pressure increase and the flow rate at the time of pressure decrease at the time of low pressure can be made extremely small. Can be secured.

FIG. 5 shows a main part of still another embodiment of the flow rate adjusting device according to the present invention. This embodiment shows that when the O-ring 3 is displaced, the axis of the O-ring 3 and the core are shifted. In order to prevent deviation from the axis 2 of the core 2, the height of the base 9 integrally provided on the upper surface of the lower portion 8 of the core 2 is increased, and a concave portion 16 for receiving the O-ring 3 is formed on the upper surface. It is.

The O-ring 3 is sandwiched between the concave portion 16 of the base 9 and the inner surface of the upright portion 4 without the O-ring 3 coming into contact with the side surface of the tip of the large projection 12. Things.

Even with this configuration, when the opening area is changed by the displacement of the O-ring 3 due to the pressure of the fluid, the axis of the O-ring 3 always coincides with the axis of the core 2. Because it can be maintained, the hysteresis that occurs between the flow rate at the time of pressure increase and the flow rate at the time of pressure decrease at the time of low pressure can be made extremely small. Can be secured.

In each of the above embodiments, the O-ring is configured so that the axis of the O-ring does not deviate from the axis of the core. However, the present invention is not limited to the configuration of each embodiment.
Various configurations can be employed to prevent the axis of the ring from being shifted from the axis with respect to the core.

[0043]

According to the present invention, as described above, the elastic member is deformed inward in response to the pressure of the acting fluid, and the opening formed between the elastic member and the outer peripheral surface of the core is formed. The area can be changed . In this case,
The four parts of the elastic member located between the large protrusions
The elastic member is deformed by a small protrusion at the center and
And two small protrusions on both sides
become. Therefore, it can be used for a wide range of fluid pressures.
The elastic member can be deformed by
To prevent the material from being deformed unreasonably.
Therefore, almost constant flow rate regardless of the pressure of the acting fluid
Will be obtained. This flow rate can be set to a predetermined value by setting the area of the opening formed between the core and the outer peripheral surface to a predetermined value in advance.
You. Further, at the time of low pressure, since the difference in flow rate between the time of buck and voltage step-up can be reduced, the flow rate excessive at low pressure proof
Can be stopped almost always regardless of the fluid pressure
A constant flow rate can be secured.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a flow control device according to the present invention.

FIG. 2 is a schematic diagram showing a relationship between a core and an O-ring.

FIG. 3 is a diagram showing the relationship between the pressure and the flow rate of the fluid of the flow rate adjusting device according to the present invention.

FIG. 4 is a schematic view of a main part showing another embodiment of the flow control device according to the present invention.

FIG. 5 is a schematic view of a main part showing still another embodiment of the flow control device according to the present invention.

FIG. 6 is a half sectional view showing a conventional flow control device.

FIG. 7 is a schematic diagram showing a relationship between a conventional core and an O-ring.

FIG. 8 is a diagram showing a relationship between a pressure and a flow rate of a fluid in a conventional flow rate adjusting device.

[Explanation of symbols]

 1, 21 ... Case 2, 22 ... Core 3, 23 ... O-ring 4, 24 ... Stand-up part 5, 6, 25, 26 ... Opening part 7, 27 ... Step part 8, 28 ... Lower part 9, 29 base 10, 30 core 11, 31 projection 12, 32 large projection 13, 13a, 33 small projection 15, 16 recess

Claims (3)

(57) [Scope of request for utility model registration] 1. A core (2) having an annular elastic member (3) provided at a predetermined distance from an outer peripheral surface is disposed inside a cylindrical case (1). Fluid flowing from one opening (6) of 1) flows out of the other opening (5) through a space formed between the core (2) and the elastic member (3), At this time, the elastic member (3) is deformed in accordance with the pressure of the inflowing fluid to change the area of the space, thereby obtaining a substantially constant flow rate regardless of the inflowing fluid pressure. An adjusting device, wherein the core (2) has an axis on its peripheral surface.
Four large projections (1
2) and the adjacent large protruding portions (12) are equally disposed and protruded.
And the central one is larger than the two
And three small projections (13) projecting from each other.
The elastic member is provided between the side surfaces of the leading end of each large projection (12).
While supporting (3), each of the large protrusions (12)
The space between each small protrusion (13) and the elastic member (3)
A flow control device characterized by forming: 2. The large projection (12) of the core (2)
The flow control device according to claim 1, wherein the tip is tapered so as to be inclined with respect to the axis . 3. The elastic member (3) is connected to the core (2).
The stand (9) provided on the case and the upright part provided on the case (1)
The flow control device according to claim 1, wherein the flow control device is sandwiched between (4).