JP2001271944A - Flow control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow control valve precisely controlling by holding a linear relation between a rotation angle and a flow rate in the whole controlling range of a valve element. SOLUTION: This flow control valve is provided with the valve element 3 for opening/closing an inlet 2 and an outlet 1 in a casing body having the both ports 1 and 2 for fluid and is so constituted that a recessed groove 10 formed in the valve element 3 can control the inflow rate of the fluid by communicating the inlet 2 and the outlet 1, fallowing the rotation of the valve element 3. The shape of the recessed groove 10 is so set that the changing rate of the flow rate to the rotation angle from an intermediate open position S2 where the inlet 2 and the outlet 1 are in the communicated state at two points of the start side and the terminal side of the recessed groove 10, to the maximum opened position becomes almost same as the changing rate of the inflow rate to the rotation angle from the closing position to the intermediate open position S2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control valve used in an air supply path of a septic tank or the like which is an example of a water treatment apparatus.

[0002]

2. Description of the Related Art There is a demand for a flow control valve having a wide range of flow control while reducing its size, and the one shown in FIG. 1 has already been proposed. This is because the inflow side cylindrical case portion 7 having the horizontal (horizontal) posture in which the air inlet 2 is formed, and the air from the case portion 7 is perpendicular (90 degrees) to the inflow direction through the outflow port 1. And an upper end surface of the outflow side cylindrical case portion 5 for guiding in an up-down (longitudinal) direction (downward in the figure) and opening and closing these two ports 1 and 2. And a rotary valve body 3 contacting an annular valve seat 9 provided on the valve body 3. The valve of the valve body 3 is used to adjust the amount of fluid flowing into the outlet 1 in accordance with the rotation angle of the valve body 3. A concave groove 10 is formed on the surface of the portion 3A. As shown in FIGS. 7 and 8 (a) and 8 (b), the concave groove 10 has a substantially circular arc shape drawn on the surface of the valve portion 3A as the rotation center of the valve portion 3A, and the circular arc is It is formed to have a superior arc larger than half of the circumference,
By forming the horizontal width and the vertical depth to gradually increase toward the end of 0, the range of adjustment can be widened as described above.

[0003]

Therefore, in order to obtain a predetermined air volume, the valve body 3 must be operated at a rotation angle corresponding to the predetermined air volume. 9 (a) and 9 (b), a certain rotation angle (position of FIG. 9 (b), from around 135 degrees from the closed position (position of FIG. 9 (a)) as shown in FIGS. ), The air volume is higher than the calculated value (theoretical value), and the relationship between the rotation angle and the air volume is not linear, that is, there is a problem that the constant adjustment cannot be performed. As shown by the two-dot chain line in FIG. 6, the rotation angle is 135 degrees (when the maximum rotation angle is 225 degrees as 100%, the opening degree is 135 degrees / 225 degrees × 100% = 60%). ) Clearly indicates that the gradient of the air flow with respect to the opening degree is large. However, since the actual airflow measurement as described above has not been performed, it has been almost used in a state in which it is not known at all that the inconvenience actually occurred.
In particular, since the abrupt increase in the airflow is from a large rotation angle, the airflow is somewhat large, and therefore, it is difficult to understand if the increase is slightly higher than a predetermined value.

SUMMARY OF THE INVENTION In view of the above situation, the present invention seeks to solve the problem by maintaining a linear relationship between the rotation angle and the air flow even in the entire adjustment region of the valve body, thereby enabling a flow rate to be accurately adjusted. The point is to provide a control valve.

[0005]

In order to solve the above-mentioned problems, the present invention provides a case having a fluid inlet and a fluid outlet, and a rotary valve for opening and closing the fluid inlet and the fluid outlet. Body, a concave groove located in the inflow port or in the outflow port is formed on the surface of the valve element, and the concave groove enters the outflow side or the inflow side with the rotation of the valve element. A flow rate control valve capable of adjusting an inflow amount of a fluid from the inflow port to the outflow port through the concave groove, wherein a forming angle of the concave groove is such that a central angle having a rotation center of the valve body as a vertex is an apex. An angle exceeding 180 degrees is set, and within the rotation range in which the valve element is rotated from the closed position to the maximum open position where the maximum inflow amount is reached, the inflow port and the inflow port are formed at two points on the starting end side and the ending side of the concave groove. From the intermediate open position where the outlet communicates with the maximum open position So the degree of change in inflow amount to the angle of rotation from the The closed position substantially the same as the degree of change in inflow amount to the rotation angle to the intermediate open position,
The flow control valve was constructed by setting the shape of the concave groove. As the inventor of the present application rotates the valve body from the closed position to the maximum open position where the maximum inflow amount is reached, the inflow port and the outflow port communicate with each other at two points, the start end side and the end side of the concave groove of the valve body. Discovered that it would be in a state. In other words, in order to gradually increase the flow rate over a wide range while reducing the size of the flow rate control valve, the angle of formation of the concave groove is set such that the rotation center of the valve body is the vertex as described above. Since the central angle must be set to an angle exceeding 180 degrees, when the valve body is rotated, the state of flowing out at two places occurs as described above. This means that, when the actual inflow is measured, the measured inflow is equal to the theoretically obtained inflow (the inflow flowing only at the end of the groove) of the fluid passing from the beginning of the groove. This is clear from the fact that the inflow is a plus value. Therefore, by setting the shape of the concave groove as described above, the inflow amount from the rotation angle of 22.5 degrees (opening 10%) to 180 degrees (opening 80%) as shown by the solid line in FIG. Can be maintained in a linear relationship that changes linearly. Although FIG. 6 shows a case where the rotation angle is from 22.5 degrees (opening degree 10%) to 180 degrees (opening degree 80%), the rotation angle can be changed according to the use or the like, and is limited to this range. Not something.

The concave groove includes a substantially arc-shaped adjusting groove drawn on the basis of the center of rotation of the valve body, and a maximum flow rate groove formed continuously with the adjusting groove and having a maximum flow rate. are doing.

The adjusting groove includes a first groove from an opening-side starting end portion to an intermediate portion corresponding to the intermediate opening position, and a maximum flow position groove from the intermediate portion corresponding to the intermediate opening position to the maximum opening position. A second groove portion up to a terminal portion corresponding to a position immediately before the first groove portion, and the two groove portions have left and right side walls and a bottom wall so that the cross-sectional shape is rectangular. The left-right width from the beginning of the groove to the end of the second groove is set to be wider toward the end,
An ascending inclined surface which is located closer to the end toward the end so that the bottom wall surface at the start end side of the second groove portion is closer to the end side so that the flow amount flowing from the first groove portion and the second groove portion to the outflow side case portion becomes a set flow amount. And the bottom wall from the end of the inclined surface of the second groove to the maximum flow groove is formed shallower than the bottom wall of the first groove. By rotating the valve element as described above, the flow rate can be gradually increased at the adjustment groove. The flow rate can be prevented from increasing more than the set value by setting the bottom wall surface on the starting end side of the second groove portion to be a rising slope positioned closer to the front surface toward the end. For example, in the case of a configuration in which the flow rate is adjusted by rising at a right angle without providing an inclined surface, the two ends on the start and end sides of the groove of the valve portion are adjusted.
It is necessary to accurately form a portion where the inflow port and the outflow port communicate with each other (a portion rising at the right angle), but if the inclined surface is formed as described above, the necessity is eliminated. is there.

A valve seat for increasing the sealing force between the inflow port and the valve body is provided, and the valve seat is formed in a substantially rectangular cross section, and the inflow port is provided to allow a part of the valve seat to enter. By forming the cross-sectional shape of the groove formed on the end surface of the valve into a substantially rectangular shape, in the case of a valve seat having a circular cross-sectional shape, the valve seat moves with respect to the groove with rotation of the valve body and the valve A part of the seat does not receive a large deformation force, and a stable contact state can always be maintained.

The valve seat is formed in a substantially D-shape comprising an arc portion slightly smaller than the outer shape of the valve portion and a straight portion linearly connecting both ends of the arc portion.

[0010]

FIG. 1 shows a flow control valve according to the present invention. As shown in the figure, this flow control valve adjusts the flow rate of the fluid from the inlet 2 to the outlet 1 by changing the rotation angle of the rotary valve body 3 that closes the inlet 2 and the outlet 1. It is configured to be able to. That is, the inflow-side cylindrical case portion 7 having a substantially horizontal posture for guiding the upper part of the inflow port 2 through the inflow path 6, and guiding the fluid from the inflow port 2 in a direction orthogonal to the direction of the inflow path 6. Outflow side cylindrical case portion 5 forming an outflow passage 4 in a substantially vertical (up and down) direction (downward in the figure)
A case body comprising: a cylindrical storage case portion 8 for storing a valve body extending upward from an upper end of the outflow side cylindrical case portion 5; and the outflow port 1, that is, the outflow side cylindrical shape. An annular valve seat 9 provided on the upper end surface of the case portion 5 is provided. Then, in order to adjust the amount of fluid flowing into the outlet 1 in accordance with the rotation angle of the valve body 3, the area surrounded by the valve seat 9 on the valve seat contact side surface of the valve portion 3 </ b> A of the valve body 3. A concave groove 10 is formed therein. Here, the groove 10 is formed so as to be located in the outlet 1 so that the groove 10 enters from the outlet 1 to the inlet 2. The concave groove 10 may be formed so as to be located in the inlet 2, and the concave groove 10 may enter from the inflow port 2 to the outflow port 1 side. Reference numeral 11 shown in the figure denotes a lid for rotatably supporting the valve body 3 and closing an upper end opening of the storage case portion 8. Reference numeral 12 denotes a handle for manual operation for rotating the valve body 3, and reference numeral 13 denotes
It is a cap for fixing the handle 12, and is screwed to the upper end of the valve body 3. The present invention is particularly effective when used for an air supply line such as a septic tank, but can be used for a device that moves other fluids that require adjustment. The inflow direction and the outflow direction of the fluid may be different from each other by 90 degrees as described above, or may be set to the same direction or any angle. Further, by forming the valve portion 3A of the valve body 3 in a circular shape, there is an advantage that the size can be reduced as compared with the case where the valve portion 3A is formed in a rectangular shape such as a rectangle or a square.

2 and 3 (a).
As shown in (b), the center angle X having the rotation center of the valve portion 3A as a vertex exceeds 180 degrees (in the figure, approximately 21 degrees).
0 degree) range, in other words, within a range (an area occupying almost 2/3 of the entire area of the valve portion in the figure) wider than half divided into two by a straight line passing through the rotation center of the valve portion 3A, Within a rotation range in which the valve body 3 is rotated from a closed position to a maximum open position where the maximum inflow is achieved, the concave groove 10 of the valve portion 3A is provided.
From the intermediate open position (the position shown in FIG. 5 (e)) to the maximum open position (the position shown in FIG. 5 (f)) in which the inflow port 2 and the outflow port 1 are in communication with each other at two positions, the start end and the end. The degree of change of the inflow amount with respect to the rotation angle up to the closing position (FIG. 5)
(Position of (a)) to the intermediate open position (position of FIG. 5 (e))
The shape of the concave groove 10 is set so as to be substantially the same as the degree of change of the inflow amount with respect to the rotation angle up to. Specifically, the concave groove 10 is formed in a substantially arc-shaped adjustment groove 14 drawn based on the rotation center of the valve portion 3A, and is formed continuously with the adjustment groove 14, and has a maximum flow rate. And a maximum flow groove 15.

As shown by the solid line in FIG. 6, when the maximum rotation angle 225 degrees of the valve element 3 is set to 100%, the opening degree of the valve element 3 is 10% to 80% (actual rotation of the valve element 3). Angle 2
In the range of 2.5 degrees to 180 degrees, the adjustment can be performed in a linear state (a state in which the inclination is constant). In the conventional device shown by two points in FIG.
%, The ratio of the air volume to the opening is rapidly increased, and the adjustment becomes impossible. In this conventional device, the adjustment range of the concave groove is smaller than that of the present invention, so that the ratio of the air flow to the opening is rapidly increased from the time when the opening is 60%. Further, in the conventional one, since the shape of the concave groove (the depth and the size of the left and right widths) is different from that of the present invention, the inclination in the adjustment range of the opening degree of 10% to 60% is different from that of the present invention. Are different. For this reason,
In order to easily understand the difference from the present invention, FIG. 6 shows a comparative example shown by a broken line as a comparative example (other than the broken line is the same as the solid line). In the case of this comparative example, since the gas is discharged from the two places from the point of time when the opening degree is 60% as described above, the slope is increased by an amount corresponding to the flow rate of the portion on the starting end side of the concave groove 10. In the experiment, an air pump having a maximum capacity of 100 L (liter) / min was used, and a pipe having an inner diameter of 13 mm for guiding air from the air pump to the flow control valve was used and discharged from the flow control valve. The flow rate of the air being measured is measured.

The adjusting groove 14 is provided at an opening-side starting end portion M1.
A first groove portion 14A from the intermediate portion M2 corresponding to the intermediate open position to the maximum flow groove portion 15 from the intermediate portion M2 corresponding to the intermediate open position to the maximum open position.
The second groove 1 up to the end portion M3 corresponding to the position immediately before
4B. Each of the grooves 14A and 14B is formed in a rectangular shape in cross section formed by left and right side walls 14a and 14b and a bottom wall 14c, and ends in a left and right width from a starting end of the first groove 14A to an end of the second groove 14B. The lower end of the second groove portion 14B is set so that the flow rate flowing out of the two portions of the first groove portion 14A and the second groove portion 14B to the outlet side case portion 5 becomes the set flow rate. The wall surface 14d is formed on a rising inclined surface located closer to the front surface side toward the end, and the bottom wall surface 14f from the end of the inclined surface 14d of the second groove portion 14B to the maximum flow groove portion 15 is separated from the bottom wall surface 14e of the first groove portion 14A. Is also shallow. The flow rate was adjusted by changing the left and right width from the start end of the first groove 14A to the end of the second groove 14B as described above, but the flow rate was adjusted by changing the depth. Is also good. Alternatively, the inclined surface 14d of the second groove 14B may be eliminated, and the end of the first groove 14A and the start of the second groove 14B may be connected at a right angle. In this case, it is necessary to precisely form a position where a perpendicular plane that forms a right angle is formed so as to be at a time when it flows out of two places as described above.

The valve seat 9 is made of a packing made of rubber or a synthetic resin having flexibility, and is provided to increase the sealing force between the outflow port 1 and the valve body 3. Is made of synthetic resin having relatively flexibility, the valve seat 9 can be omitted. As shown in FIG. 1, the valve seat 9 is formed in a substantially rectangular cross section (square or rectangular), and a groove formed in an end face of the outflow port 1 to allow a part of the valve seat 9 to enter. The cross-sectional shape of 16 is substantially rectangular (square or rectangular).
The valve seat 9 is mounted by fitting it into the groove 16, but the groove 16 may be omitted and the valve seat 9 may be mounted by heat fusion or an adhesive.

As shown in FIG. 2, the valve seat 9 is
The valve portion 3A has a substantially D-shaped configuration including an arc portion 9A slightly smaller than the outer shape of the valve portion 3A and a straight portion 9B that linearly connects both ends of the arc portion 9A. It can also be configured and implemented.

FIG. 4 shows that when the handle 12 is rotated, the concave groove 10 with respect to the valve seat 9 when the flow control valve is fully closed (rotation angle 0 degrees) to fully open (rotation angle 225 degrees). Shows the relationship. Also, from the fully closed state (closed position) in FIG. 5A, in FIG. 5B, the handle is set to 20 degrees (when the rotation angle 225 degrees when fully opened is 100%, the opening is 8.9%). FIG. 5 shows the case of rotation.
5C shows a case where the handle is rotated 90 degrees (opening degree 40%), and FIG. 5D shows a case where the handle is rotated 135 degrees (opening degree 60%). ) Shows a case in which the handle is rotated by 146.25 degrees (opening 65%) (intermediate open position), and FIG. 5F shows a fully opened state in which the handle is rotated by 225 degrees (opening 100%). (Maximum open position). Then, at the time of switching from FIG. 5D to FIG. 5E, as described above, the start end of the first groove 14A and the start end of the second groove 14B (inclined surface 14d).
At two locations, the inflow port 2 and the outflow port 1 are in communication with each other, and this communication state is continued up to the maximum open position. Then, in the conventional device, as shown in FIG. 6, the flow sharply starts from the point of time when the opening degree is 60% (the gradient of the graph becomes large), but in the present application, the gradient becomes the same (constant). The opening degree can be adjusted within a range from 10% to 80%. In FIG. 5, a portion overlapping with the valve seat 9 is also shown by a solid line to make the recess 10 easier to understand. Note that the range of the adjustment can be freely changed depending on the formation angle of the concave portion 10, the shape of the concave portion 10, and the like. In the drawing, the concave portion 10 is constituted by a single member, but may be constituted by a plurality of members.

A regulation mechanism (not shown) for regulating the rotation angle of the handle 12, that is, the rotation angle between 0 degree and 225 degrees, is provided, and the rotation angle at the time of rotating operation is easily grasped. A scale may be provided on the lid 11 side so that a mark indicating the rotational position with respect to the scale or a pointer 17 (see FIG. 4) may be provided on the handle 12 side. A sensor (for example, a non-contact type or a contact type) for detecting the rotational position of the handle 12 is provided, and a display unit for displaying a rotation angle (more convenient to display the outflow amount) based on information from the sensor is provided. Can also be implemented.

[0018]

According to the first aspect, the inflow with respect to the rotation angle from the intermediate open position to the maximum open position in which the inflow port and the outflow port communicate with each other at two points, the start end and the end, of the groove. By setting the shape of the concave groove so that the degree of change in the amount is almost the same as the degree of change in the inflow amount with respect to the rotation angle from the closed position to the intermediate open position, while reducing the size of the flow control valve, The inflow rate can be adjusted at a fixed rate set over a wide range, and a flow control valve useful in a field that requires miniaturization and expansion of the adjustment range can be provided.

According to the third aspect, the bottom wall surface on the start end side of the second groove portion is formed as a rising inclined surface located closer to the front surface than the terminal end side. In the case of a configuration in which the inflow passage and the outflow passage are communicated with each other at the beginning and the end of the concave groove of the valve portion (the portion that rises at the right angle) without having to be formed with high precision. The flow rate can be prevented from increasing more than the set value, which is advantageous in terms of manufacturing and assembly.

According to the fourth aspect, the valve seat for increasing the sealing force between the inflow port and the valve body is formed in a substantially rectangular cross section, and the end face of the inflow port is formed to allow a part of the valve seat to enter. By forming the cross-sectional shape of the groove to be formed into a substantially rectangular shape, in the case of a valve seat having a circular cross-sectional shape, the valve seat moves with respect to the groove with rotation of the valve body, and the It is possible to provide a flow control valve that can maintain a stable contact state at all times without receiving a large deformation force and that can be used favorably for a long period of time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a flow control valve.

FIG. 2 is an expanded view of a valve body and a case body having a cross section.

FIG. 3 shows a valve portion of a valve body, (a) is a bottom view thereof,
(B) is a sectional view taken along line AA of (a).

FIG. 4 is an explanatory diagram showing a maximum rotation angle of a handle.

FIGS. 5A to 5F are explanatory diagrams showing an arbitrary rotation angle of a concave groove with respect to a valve seat.

FIG. 6 is a graph showing a relationship between an opening and an air volume.

FIG. 7 is an expanded view of a conventional valve body and a case body having a cross section.

FIG. 8 shows a conventional valve element, (a) is a bottom view thereof,
(B) is a sectional view taken along line AA of (a).

FIG. 9 shows a concave groove and a valve seat of a conventional valve body.
A fully closed state is shown, and (b) shows a state rotated by 135 degrees.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outlet 2 Inlet 3 Valve body 3A valve part 4 Outflow passage 5 Outflow side cylindrical case part 6 Inflow path 7 Inflow side cylindrical case part 8 Storage case part 9 Valve seat (packing) 9A Arc part 9B Linear part 10 Recessed groove 11 Lid 12 Handle for manual operation 13 Cap 14 Adjustment groove 14A First groove 14B Second groove 14a, 14b Side wall 14c Bottom wall 14d Bottom wall (slope) 14e, 14f Bottom wall 15 Maximum flow groove 16 Groove 17 Pointer part M1 Start part M2 Middle part M3 End part

Claims (5)

[Claims] 1. A case body having a fluid inlet and a fluid outlet, and a rotary valve body for opening and closing the fluid inlet and the fluid outlet, wherein a surface of the valve body is provided inside or outside the fluid inlet. Forming a concave groove located in the outlet, and inflow of the fluid from the inlet to the outlet through the concave groove by the groove entering the outlet side or the inlet side with the rotation of the valve body; A flow control valve capable of adjusting an amount, wherein an angle at which the concave groove is formed is set to an angle where a central angle having a rotation center of the valve body as a vertex exceeds 180 degrees, and the valve body is closed. From the intermediate open position to the maximum open position where the inflow port and the outflow port communicate with each other at two positions on the starting end side and the ending side of the concave groove within a rotation range of rotating from the maximum opening position to the maximum inflow amount. The degree of change of the inflow with respect to the rotation angle up to The flow control valve, wherein the shape of the groove is set so as to be substantially the same as the degree of change of the inflow amount with respect to the rotation angle from the position to the intermediate open position. 2. The control device according to claim 2, wherein the concave groove has a substantially arc-shaped adjustment groove drawn on the basis of the rotation center of the valve body, and a maximum flow rate groove formed continuously with the adjustment groove and having a maximum flow rate. The flow control valve according to claim 1, wherein the flow control valve comprises: A first groove extending from an opening-side starting end portion to an intermediate portion corresponding to the intermediate opening position;
A second groove from an intermediate portion corresponding to the intermediate open position to an end portion corresponding to a position immediately before the maximum flow rate groove which is the maximum open position, and the two grooves have a rectangular cross-sectional shape. The groove portion is constituted by left and right side walls and a bottom wall as described above, and the left and right width from the start end of the first groove portion to the end of the second groove portion is set to be wider toward the end side, and the first groove portion The bottom wall surface on the starting end side of the second groove portion is formed on a rising inclined surface located closer to the front surface side toward the terminal end so that the flow rate flowing from the two locations of the second groove portion to the outflow side case portion becomes the set flow rate, 3. The flow control valve according to claim 2, wherein a bottom wall from the end of the inclined surface of the second groove to the maximum flow groove is formed shallower than a bottom wall of the first groove. 4. A valve seat for increasing a sealing force between the inflow port and the valve body is provided, and the valve seat is formed to have a substantially rectangular cross-sectional shape, and the valve seat is provided to allow a part of the valve seat to enter. 2. The flow control valve according to claim 1, wherein the cross-sectional shape of the groove formed on the end face of the inflow port is substantially rectangular. 5. The valve seat is formed in a substantially D-shape comprising an arc portion slightly smaller than the outer shape of the valve portion and a straight portion linearly connecting both ends of the arc portion. Claim 4
A flow control valve as described.