JP3589144B2 - Flow control valve - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flow control valve used in an air supply path such as a septic tank, which is an example of a water treatment apparatus.
[0002]
[Prior art]
The flow control valve is required to have a wide range of flow control while reducing the size, and the valve shown in FIG. 1 has already been proposed.
This is because the inflow side cylindrical case portion 7 having the horizontal (lateral) 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 via the outflow port 1. And an upper end surface of the outflow-side cylindrical case portion 5 for guiding in an up-down (vertical) direction (downward in the figure) and opening and closing these two ports 1 and 2. And a rotary valve body 3 that contacts an annular valve seat 9 provided at the front end of the valve body 3. The valve of the valve body 3 adjusts 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 As described above, the range of adjustment can be widened by forming the arc into a superior arc larger than half of the circumference and gradually increasing both the left-right width and the vertical depth toward the end of the concave groove 10. I can do it.
[0003]
[Problems to be solved by the invention]
Therefore, in order to obtain a predetermined air volume, the valve body 3 must be operated at a corresponding rotation angle. However, when the air volume with respect to the rotation angle (opening degree) of the valve body 3 is actually measured, FIG. As shown in (a) and (b), a calculated value (theoretical value) is obtained from a specific rotation angle (the position in FIG. 9B, around 135 degrees) from the closed position (the position in FIG. 9A). However, there has been a problem that the air volume is increased and the relationship between the rotation angle and the air volume is not linear, that is, constant adjustment cannot be performed. This is because, as shown by the solid line in FIG. 6, the rotation angle is 135 degrees (when the maximum rotation angle is 225 degrees is 100%, the opening degree is 135 degrees / 225 degrees × 100% = 60%). This is apparent from the fact that the inclination 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 rapid 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.
[0004]
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 providing a flow control valve capable of performing accurate adjustment. The point is to provide.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention includes a case body provided with an inlet and an outlet for a fluid, and a rotary valve body for opening and closing the inlet and the outlet. A concave groove located in the inflow port or in the outflow port is formed on the surface of the inflow port, and the inflow groove enters the outflow port side or the inflow port side with the rotation of the valve body, so that the inflow groove passes through the inflow port or the inflow port. A flow control valve capable of controlling an inflow amount of a fluid to an outlet, wherein a forming angle of the concave groove is set to an angle whose central angle with a rotation center of the valve body as a vertex exceeds 180 degrees. Within the rotation range in which the valve element is rotated from the closed position to the maximum open position where the maximum inflow rate is reached, the concave groove has a substantially arc-shaped adjustment groove drawn based on the rotation center of the valve element. The maximum flow rate that is continuously formed in the adjustment groove and that is the maximum flow rate And the adjusting groove portion, the first groove portion from the open-side start end portion to the intermediate portion, and from the intermediate portion to the end portion corresponding to the position immediately before the maximum flow rate groove portion which is the maximum open position. A second groove, wherein the first groove is located at the inlet, and the maximum flow groove is located at the inlet from an intermediate open position where the second groove is located at the outlet. as the degree of change in inflow amount to the rotational angle of up to an open position as the state becomes substantially the same as the degree of change in inflow amount to the rotation angle to the intermediate open position from the closed position, the shape of the concave groove The groove is formed by right and left side walls and a bottom wall so that the two grooves have a rectangular cross-sectional shape, and ends in a left and right width from a start end of the first groove to an end of the second groove. Side The bottom wall on the starting end side of the second groove is located closer to the front side toward the end so that the flow rate flowing out of the first groove and the second groove to the outlet side case part at a set flow rate. The flow control valve was formed on an inclined surface, and the bottom wall from the end of the inclined surface of the second groove to the maximum flow groove was formed shallower than the bottom wall of the first 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 top 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 side 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. Accordingly, by setting the shape of the concave groove as described above, as shown by the two-dot chain line in FIG. 6, the rotation angle is changed from 22.5 degrees (opening 10%) to 180 degrees (opening 80%). It is possible to maintain a linear relationship in which the inflow amount 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.
Further, by rotating the valve element as described above, the flow rate can be gradually increased in the adjusting 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 side toward the end side. 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, a point where the inflow port and the outflow port communicate with each other at two points on the starting end side and the end side of the concave groove of the valve portion ( It is necessary to accurately form the portion that rises at a right angle), but if the inclined surface is formed as described above, this need is eliminated.
[0006]
The opening degree of the valve element with respect to the intermediate opening position is set to 65% when the opening degree of the valve element with respect to the maximum opening position is set to 100%.
[0008]
A valve seat for increasing the sealing force between the inflow port and the valve body is provided, the valve seat is formed in a substantially rectangular cross-sectional shape, and an 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 the rotation of the valve body and a part of the valve seat. Does not receive a large deformation force, and can always maintain a stable contact state.
[0009]
The valve seat is formed in a substantially D-shape including an arc portion slightly smaller than the outer shape of the valve portion and a linear portion connecting both ends of the arc portion linearly.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a flow control valve of 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 closing 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 passage 2 through the inflow passage 6, and guiding the fluid from the inflow passage 2 in a direction orthogonal to the direction of the inflow passage 6. Outflow-side cylindrical case portion 5 that forms an outflow passage 4 in a substantially vertical (up-down) direction (downward in the figure) for storing the valve body extending upward from the upper end of the outflow-side cylindrical case portion 5 And an annular valve seat 9 provided on an upper end surface of the outlet 1, that is, the outlet-side cylindrical case 5. In order to adjust the amount of fluid flowing into the outflow port 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 the inlet 2 from the outlet 1. The groove 10 may be formed so as to be located in the inlet 2, and the groove 10 may be configured to enter the outlet 1 from the inlet 2. Reference numeral 11 shown in the figure denotes a lid for rotatably supporting the valve element 3 and closing an upper end opening of the storage case section 8. Reference numeral 12 denotes a handle for manual operation for rotating the valve body 3, and reference numeral 13 denotes a cap for fixing the handle 12, which is screwed to an upper end of the valve body 3. . The present invention is particularly effective when used in an air supply line such as a septic tank, but can be used in a device that moves other fluids requiring 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 a case where the valve portion 3A is formed in a rectangular shape such as a rectangle or a square.
[0011]
As shown in FIGS. 2 and 3 (a) and (b), the concave groove 10 has an angle at which the central angle X having the rotation center of the valve portion 3A as a vertex exceeds 180 degrees (approximately 210 degrees in the figure). The valve body is formed in a range (in other words, an area occupying almost 2/3 of the whole area of the valve portion in the figure) wider than half divided by a straight line passing through the rotation center of the valve portion 3A. The inflow port 2 and the outflow port 1 communicate with each other at two positions on the starting end side and the ending side of the concave groove 10 of the valve portion 3A within a rotation range in which the valve 3 is rotated from the closed position to the maximum open position where the maximum inflow is achieved. The degree of change of the inflow amount with respect to the rotation angle from the intermediate open position (the position shown in FIG. 5 (e)) to the maximum open position (the position shown in FIG. 5 (f)) becomes the closed position (the position shown in FIG. 5 (a)). ) To the intermediate opening position (position of FIG. 5 (e)) and the degree of change of the inflow amount with respect to the rotation angle. Intended to be substantially the same, and setting the shape of the concave groove 10. Specifically, the concave groove 10 is formed in a substantially arc-shaped adjusting groove portion 14 drawn based on the rotation center of the valve portion 3A, and is formed continuously with the adjusting groove portion 14 and has a maximum flow rate. And a maximum flow groove 15.
[0012]
Then, as shown by a two-dot chain line in FIG. 6, when the maximum rotation angle 225 degrees of the valve element 3 is 100%, the opening degree of the valve element 3 is 10% to 80% (the actual rotation angle of the valve element 3). In the range of 22.5 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 the solid line in FIG. 6, the ratio of the air flow to the opening is rapidly increased from the point of time when the opening is 60%, so that 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 device, 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, a comparative example shown by a broken line in FIG. 6 is the same as the solid line except for the broken line. In the case of this comparative example, since the gas is discharged from the two places as described above from the point of time when the opening degree is 60%, the inclination is increased by 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. The flow rate of the air being measured is measured.
[0013]
The adjusting groove portion 14 includes a first groove portion 14A from an open-side start end portion M1 to an intermediate portion M2 corresponding to the intermediate open position, and the maximum flow rate from the intermediate portion M2 corresponding to the intermediate open position to the maximum open position. And the second groove portion 14B up to the end portion M3 corresponding to the position immediately before the groove portion 15. Each of the grooves 14A and 14B is formed in a rectangular cross-sectional shape formed by left and right side walls 14a and 14b and a bottom wall 14c, and ends in a left and right width from the starting end of the first groove 14A to the end of the second groove 14B. The lower end of the second groove 14B is set so that the flow rate flowing from the first groove 14A and the second groove 14B to the outlet case 5 from the two places becomes equal to 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 the position at which the perpendicular plane that forms a right angle is formed so as to be at the time of flowing out of the two places as described above.
[0014]
The valve seat 9 is made of a packing made of rubber, a synthetic resin having flexibility, or the like, and is provided to increase a sealing force between the outlet 1 and the valve body 3. In the case of using a flexible synthetic resin or the like, 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 outlet 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.
[0015]
As shown in FIG. 2, the valve seat 9 is composed of an arcuate portion 9A slightly smaller than the outer shape of the valve portion 3A and a linear portion 9B that linearly connects both ends of the arcuate portion 9A. Although it is configured in a substantially D-shape, it can be configured and implemented in other different shapes.
[0016]
FIG. 4 shows the relationship of the groove 10 with respect to the valve seat 9 when the flow rate control valve is operated from fully closed (rotation angle 0 degree) to fully opened (rotation angle 225 degree) by rotating the handle 12. ing. In addition, from the fully closed state (closed position) in FIG. 5A, in FIG. 5B, the opening degree is 8.9% if the steering angle is 20 degrees (the rotation angle 225 degrees when fully opened is 100% opening degree). FIG. 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%). FIG. 5 (e) shows a case where the handle is rotated by 146.25 degrees (opening 65%) (intermediate open position), and FIG. 5 (f) shows a case where the handle is (A degree of 100%) in a fully open state (maximum open position). Then, at the time of switching from FIG. 5D to FIG. 5E, as described above, the inflow port 2 and the outflow port 1 are formed at the two starting points of the first groove 14A and the second groove 14B (inclined surface 14d). Are in communication with each other, and this communication is continued up to the maximum open position. Then, in the conventional device, as shown in FIG. 6, the flow suddenly starts from the time when the opening degree is 60% (the gradient of the graph increases), but in the present application, the gradient becomes the same (constant). The opening degree can be adjusted in 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. 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 figure, the concave portion 10 is constituted by a single member, but may be constituted by a plurality of members.
[0017]
A regulating 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 can be easily grasped. A scale may be provided on the lid 11 side, and a mark or a pointer 17 (see FIG. 4) indicating the rotational position with respect to the scale may be provided on the handle 12 side. A sensor (such as a non-contact type or a contact type) for detecting a rotational position is provided, and a display unit for displaying a rotation angle (more convenient if the outflow amount is also displayed) is provided based on information from the sensor. You can also.
[0018]
【The invention's effect】
The degree of change of the inflow amount with respect to the rotation angle from the intermediate open position to the maximum open position at which the inflow port and the outflow port communicate with each other at the two positions on the starting end side and the end side of the concave groove is from the closed position to the intermediate open position. By setting the shape of the concave groove so as to be almost the same as the degree of change of the inflow amount with respect to the rotation angle, while reducing the size of the flow control valve, at a constant rate set over a wide range The inflow amount can be adjusted, and a flow control valve useful in a field requiring miniaturization and expansion of the adjustment range can be provided.
In addition, when the bottom wall surface on the starting end side of the second groove portion is formed as a rising inclined surface located closer to the front surface side than the terminal end side, for example, in a case where there is no inclined surface, the valve portion is set up at a right angle and the flow rate is adjusted. The flow rate is larger than the set value without accurately forming a place where the inflow passage and the outflow passage communicate with each other at the start end side and end end side of the concave groove (the above-mentioned perpendicularly rising point). The increase can be avoided, which is advantageous in terms of manufacturing and assembly.
[0020]
A valve seat for increasing the sealing force between the inflow port and the valve body is formed in a substantially rectangular cross-sectional shape, and a cross-sectional shape of a groove formed in an end face of the inflow port to partially enter the valve seat is substantially rectangular. By forming into a shape, in the case of a valve seat formed in a circular cross-sectional shape, the valve seat moves with respect to the groove with the rotation of the valve body and a part of the valve seat does not receive a large deformation force. Thus, it is possible to provide a flow control valve which can always maintain a stable contact state and can be used favorably over 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.
3A and 3B show a valve portion of a valve body, wherein FIG. 3A is a bottom view thereof, and FIG. 3B is a sectional view taken along line AA of FIG. 3A.
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 degree and an air volume.
FIG. 7 is an expanded view of a conventional valve body and a case body having a cross section.
8A and 8B show a conventional valve element, wherein FIG. 8A is a bottom view thereof, and FIG. 8B is a sectional view taken along line AA of FIG. 8A.
9A and 9B show a concave groove and a valve seat of a conventional valve body, FIG. 9A shows a fully closed state, and FIG. 9B 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 path 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 portion 9B Straight portion 10 Concave 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 (inclined surface) 14e, 14f Bottom Wall 15 Maximum flow groove 16 Groove 17 Pointer M1 Start end part M2 Middle part M3 End part

Claims (4)

A case body having an inflow port and an outflow port of a fluid, and a rotary valve for opening and closing the inflow port and the outflow port are provided, and are located in the inflow port or the outflow port on the surface of the valve body. Forming a concave groove, and adjusting the inflow amount of the fluid from the inlet to the outlet through the concave groove by entering the outlet or the inlet with the rotation of the valve body. The flow control valve can be formed, wherein the angle of formation of the concave groove is set to an angle where the central angle with the rotation center of the valve body as the apex exceeds 180 degrees, and the maximum inflow amount from the closed position with the valve body Within the rotation range of rotating to the maximum open position, the concave groove is formed substantially continuously with an arc-shaped adjustment groove drawn on the basis of the rotation center of the valve body, and is formed continuously with the adjustment groove. And the maximum flow rate groove portion that becomes the flow rate, the adjusting groove portion, A first groove portion from a release-side start end portion to an intermediate portion, and a second groove portion from the intermediate portion to an end portion corresponding to a position immediately before the maximum flow rate groove portion which is the maximum open position, A rotation angle from a middle open position where the groove is located at the inlet and the state where the second groove is located at the outlet to a maximum open position where the maximum flow groove is located at the inlet. as the degree of change in inflow amount is substantially the same as the degree of change in inflow amount to the angle of rotation from the closed position to the intermediate open position relative to setting the shape of the concave groove, the two grooves cross section rectangular The groove is formed of left and right side walls and a bottom wall so as to have a shape, and the left and right widths from the start end of the first groove to the end of the second groove are set to be wider toward the end, 1 groove and 2 grooves The bottom wall surface at the start end side of the second groove is formed on a rising inclined surface located closer to the front surface toward the end so that the flow rate flowing from the second groove portion to the outflow side case portion becomes a set flow rate, and the inclined surface of the second groove portion is formed. A bottom wall from the end of the first groove to the maximum flow groove is formed shallower than a bottom wall of the first groove . 2. The flow control valve according to claim 1 , wherein an opening degree of the valve body with respect to the intermediate opening position is set to 65% when an opening degree of the valve body with respect to the maximum opening position is set to 100% . 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-sectional shape. 2. The flow control valve according to claim 1, wherein the cross-sectional shape of the groove is substantially rectangular. Said valve seat, and a little smaller major arc section than the outer shape of the valve portion, of claim 3, wherein both ends of the major arc portion formed by constituting a substantially D-shape consisting of a straight portion which linearly connected Flow control valve.

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