JP4071071B2 - Flow control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flow rate adjusting device that adjusts a flow rate, a pressure, and the like by changing a throttle diameter.
[0002]
[Prior art]
In order to perform control such as flow rate adjustment and pressure adjustment in a circuit through which fluid flows, it has been conventionally performed to reduce the flow area by inserting an orifice plate (plate having a throttle) into the flow path of the circuit. . When adjusting the flow rate and pressure over a plurality of types, it is common to prepare various orifice plates with different orifice diameters (throttle diameters) and change them by replacing them.
[0003]
Further, as a means for changing the flow path area, a needle adjusting valve forming one of the flow rate adjusting devices has been generally used. According to this needle adjustment valve, the flow passage area is changed as needed by moving the needle position to an appropriate position. Therefore, it is possible to adjust to a target flow rate, pressure, or the like by operating the needle.
[0004]
[Problems to be solved by the invention]
By the way, in order to change the orifice diameter (hereinafter referred to as “throttle diameter”), it is necessary to cut the circuit once in order to replace the orifice plate, that is, the joint, joint, or pipe having the orifice plate. In this case, in order to cut the circuit, it is necessary to stop the flow of the fluid in the circuit, and the supply of the fluid is temporarily stopped. Furthermore, not only can the orifice plate be replaced quickly, but also impurities can enter the circuit. In addition, much labor is required for replacement.
[0005]
In addition, the needle adjustment valve described above can easily adjust the flow area and continuously adjust the flow rate, pressure, etc., but it is not a fixed throttle like the orifice plate. It is difficult to say that the required flow passage area can be obtained accurately and reliably and the flow rate can be adjusted. In particular, there is a concern that the needle will move slightly as the elapsed time of use increases, and it is difficult to accurately narrow down the flow path area and stably deliver the needle.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flow rate adjusting device that can easily change the throttle for controlling the flow of fluid accurately and stably.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following means.
According to a first aspect of the present invention, a flow rate adjusting device includes a rotor having a plurality of throttle channels rotatably provided in a housing, and communicates with any one of the throttle channels according to the rotation of the rotor. An inlet port and an outlet port for fluid are provided in the housing, and each of the throttle channels has both openings formed substantially in the same shape as the openings of the inlet port and the outlet port. The diaphragms are provided with a diaphragm having a predetermined diaphragm diameter, and the diaphragms are provided so as to be positioned differently in the rotation axis direction of the rotor.
[0008]
According to such a configuration, the inlet port and the outlet port communicate with one of a plurality of throttle channels formed in the rotor depending on the rotational position of the rotor, and the fluid introduced from the inlet port It is sent out from the outlet port in a state where the flow rate and pressure are adjusted by passing through the flow path. When the rotor further rotates and another throttle channel communicates with the inlet port and the outlet port, the fluid is adjusted in flow rate according to the throttle channel and sent out from the outlet port.
[0012]
Each throttle part provided in each throttle channel formed in the rotor is provided to be at different height positions in the rotation axis direction of the rotor, so that the throttle channels communicate with each other inside the rotor. Instead, the fluid introduced from the inlet port flows through only one throttle channel communicating with the outlet port and is sent out from the outlet port.
[0013]
According to a second aspect of the present invention, in the flow rate adjusting device according to the first aspect of the present invention, a continuous curved surface is formed from both the opening portions to the throttle portion.
[0014]
According to this, the fluid introduced from the inlet port smoothly flows toward the throttle portion while being guided to the wall surface according to the invention, and the fluid that has passed through the throttle portion is the wall surface according to the invention. It flows smoothly toward the exit port while being guided by the This reduces the pressure loss of the fluid during the flow process in the throttle channel.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, each embodiment in the flow control device of the present invention will be described with reference to the drawings.
[First Embodiment]
1-5 is a figure explaining the structure of the flow volume adjustment apparatus in the 1st Embodiment of this invention. FIG. 1A is an external view of the flow rate adjusting device, and FIG. 1B is a cross-sectional view including axes of an inlet port 21 and an outlet port 22 described later.
The flow rate adjusting device 1 mainly includes a housing 2, a rotor 3 rotatably provided in the housing 2, and an operation knob 4 that is attached to an upper end portion of the rotor 3 and operates to rotate the rotor 3. It is configured to prepare for.
[0020]
As shown in FIG. 1B, the housing 2 is configured in a state where the three blocks are combined, and the base block 2c, the main block 2b, and the cover block 2a are formed from a resin material from below. Has been. Each of these blocks 2a, 2b, 2c is fastened by a plurality of bolts 13, 14.
[0021]
The main block 2b is formed to have a space for inserting a columnar rotor 3 to be described later, and this space is opened on the side where the cover block 2a is attached (upward on the paper surface). In addition, an inlet port 21 and an outlet port 22 connected to the above-described space are formed on the side surface of the main block 2b, and both the ports 21 and 22 are positioned so as to face each other with the inserted rotor 3 interposed therebetween. The rotor 3 is located on the same straight line perpendicular to the rotation axis. Further, in the main block 2b and the rotor 3, a fluororesin excellent in chemical resistance is used.
[0022]
O-ring grooves are formed on the inner wall surface of the housing 2 in contact with the outer peripheral surface of the rotor 3 so as to surround the openings of the inlet port 21 and the outlet port 22, and the O-rings 52, 53 are formed in the O-ring grooves. Are fitted. These O-rings 52 and 53 prevent the fluid flowing from the inlet port 21 to the outlet port 22 from leaking into the housing 2.
An O-ring groove is also formed on the upper side of the rotor 3, and an O-ring 51 having a diameter substantially equal to the diameter of the rotor 3 is fitted therein. The O-ring 51 ensures a seal between the inside and outside of the housing 2.
[0023]
The cover block 2a is provided to prevent the rotor 3 from falling off when the rotor 3 is inserted into the housing 2, and the upper end portion of the rotor 3 is pulled out from the upper surface opening hole 2a1 while the outer peripheral side of the rotor 3 is suppressed. Yes.
[0024]
Next, the structure of the rotor 3 will be described with reference to FIGS.
FIG. 2 is a front view of the opening of the first throttle channel 31 as viewed from the front, and a cross-sectional view taken along the line AA of the front view. The cross-sectional view shown here is the same as that obtained by extracting only the rotor 3 of FIG. Moreover, the A1-A1 cross section of a front view is shown by Fig.5 (a).
FIG. 3 is a front view of the opening of the second throttle channel 32 as viewed from the front, and a cross-sectional view taken along the line BB of the front view. In addition, the B1-B1 cross section of a front view is shown by FIG.5 (b).
FIG. 4 is a front view of the opening of the third throttle channel 33 as viewed from the front, and a cross-sectional view taken along the CC line of the front view. In addition, the C1-C1 cross section of the front view is shown in FIG.
[0025]
As described with reference to FIG. 1, the rotor 3 is provided with three throttle channels that communicate between the inlet port 21 and the outlet port 22 in accordance with the position where the rotor 3 rotates in the housing 2. That is, the first throttle channel 31 having the throttle portion 31a having the throttle diameter of 0.2 mm shown in FIGS. 1B and 2 and the first throttle portion 32a having the throttle diameter of 0.4 mm shown in FIG. Two throttling flow paths 32 and a throttling flow path 33 having a throttling portion 33 a having a throttling diameter of 0.6 mm shown in FIG. 4 are formed so as to penetrate the rotor 3. Each throttle diameter φ is appropriately changed according to the specifications of the flow rate adjusting device 1.
[0026]
Further, the direction in which each throttle channel 31, 32, 33 is formed (the axial direction of the channel) is relative to the center of the rotor 3 as shown in the cross sections of FIGS. 5 (a), (b), and (c). They are offset by 60 degrees. Thus, every time the rotor 3 is rotated 60 degrees, any one of the throttle channels communicates with the inlet port 21 and the outlet port 22.
[0027]
As a common structure in each throttle channel 31, 32, 33, the center position of each opening in the outer peripheral surface of the rotor 3 exists at the same height position in the rotation axis direction of the rotor 3, in other words, The ports 21 and 22 are located at the same height as the center position of the opening on the inner wall surface of the housing 2. Further, the shape of the opening of each throttle channel 31, 32, 33 is the same as the shape of the opening of each port 21, 22 on the inner wall surface of the housing 2.
[0028]
As shown in FIGS. 2 to 4, the throttle portions 31 a, 32 a, 33 a of the throttle channels 31, 32, 33 are provided at different height positions in the rotation axis direction of the rotor 3. These diaphragm portions 31a, 32a, 33a intersect three-dimensionally. Therefore, it is avoided that the throttle channels 31, 32, and 33 communicate with each other.
[0029]
Then, between the narrowed portions 31a, 32a and 33a from the openings of the narrowed flow passages 31, 32 and 33 are formed by gently tapered wall surfaces 31b, 31c, 32b, 32c, 33b and 33c (curved surfaces). The fluid flowing here flows smoothly.
[0030]
Next, the operation knob 4 will be described with reference to FIG. The operation knob 4 is fixed to the rotor 3 by the bolt 11 inserted from the upper surface being screwed into the upper end portion of the rotor 3 described above. Further, a lock pin 12 penetrating the operation knob 4 and the upper end portion of the rotor 3 is attached to prevent slippage in rotation between the operation knob 4 and the rotor 3.
[0031]
Now, operations and effects in performing flow rate adjustment and the like of the fluid in the flow rate adjusting device 1 having the above-described configuration will be described.
As shown in FIG. 1, when the operation knob 4 is rotated manually or using power and the first throttle channel 31 is positioned so as to communicate with the inlet port 21 and the outlet port 22, the operation knob 4 is introduced from the inlet port 21. The fluid passes through the throttle portion 31a. Therefore, the fluid is adjusted to a flow rate and pressure corresponding to the throttle diameter φ0.2 mm and is sent out from the outlet port 22.
[0032]
When the fluid flows through the throttle channel 31, the fluid is guided to the throttle portion 31 a while being guided to the tapered wall surface 31 b, and is further sent to the outlet port 22 while being guided from the throttle portion 31 a to the tapered wall surface 31 c. As a result, the fluid flows smoothly without causing cavitation or the like, and pressure loss during the distribution is suppressed and the fluid is guided to the outlet port.
[0033]
Further, by rotating the operation knob 4 by 60 degrees, the second throttle channel 32 shown in FIG. 2 communicates with the inlet port 21 and the outlet port 22, and the fluid has a throttle diameter of φ0.4 mm. The flow rate is adjusted or the pressure is adjusted in accordance with the throttle portion 32a, and the gas is sent out from the outlet port 22. Even in this case, the fluid smoothly flows through the second throttle channel 32 by the tapered wall surfaces 32b and 32c, and the pressure loss of the fluid is suppressed and sent out.
[0034]
Further, by rotating the operation knob 4 by 60 degrees, the third throttle channel 33 shown in FIG. 3 is communicated with the inlet port 21 and the outlet port 22, and the fluid has a throttle diameter of 0.6 mm. The flow rate is adjusted or the pressure is adjusted in accordance with the throttling portion 33a, and the flow is sent out from the outlet port 22. Even in this case, the fluid smoothly flows through the third throttle channel 33 by the tapered wall surfaces 33b and 33c, and the pressure loss of the fluid is suppressed and sent out.
[0035]
Thus, according to the flow control device 1 in the present embodiment, the following effects can be obtained.
The fluid introduced from the inlet port 21 can be appropriately adjusted in flow rate or pressure using any one throttle channel 31, 32, 33 selected by the rotation of the rotor 3. This eliminates the need to cut the circuit through which the fluid flows in order to adjust the flow rate, and makes it possible to easily and quickly adjust the flow rate and pressure by the throttle. Since each of the throttle channels 31, 32, 33 is formed independently of the rotor 3, the flow of the fluid is not affected by the other throttle channels, and the flow of the fluid is reliably and highly accurate. Control can be performed.
[0036]
In addition, by allowing the fluid to pass through the fixed throttle portions 31a, 32a, and 33a that do not change in shape depending on the elapsed time, it is possible to perform reliable and stable accurate flow rate adjustment without depending on the elapsed time.
Further, there is no step in the throttle channel with respect to the inlet port 21 and the outlet port 22, and a gentle curved surface is continuous from both openings of the throttle channels 31, 32, 33 to the throttle portions 31a, 32a, 33a. Therefore, the flow of fluid becomes smooth, and the pressure loss can be suppressed and a stable flow can be led. Therefore, it is possible to realize a flow rate adjusting device that can control the flow rate reliably and with high accuracy.
[0037]
[Second Embodiment]
Next, a second embodiment of the flow rate adjusting device of the present invention will be described with reference to FIG. In addition, since the structure of the rotor 3 differs in the structure of the flow volume adjusting device 1 in this embodiment compared with the structure of 1st Embodiment, this difference is demonstrated in detail and the same code | symbol is used about the same structure. A part of the description will be omitted.
[0038]
6A and 6B are cross-sectional views illustrating the configuration of the flow rate adjusting device 1 according to the present embodiment, in which FIG. 6A is a cross-sectional view including the axes of the inlet port 21 and the outlet port 22, and FIG. It is sectional drawing in D1 cross section.
In the flow rate adjusting device 1 of the present embodiment, as shown in FIG. 6 (b), three throttle channels 41, 42, 43 formed in the rotor 3 are formed at the intersection 44 located at the center of the rotor 3. It is formed through the rotor 3 so as to cross each other. In addition, the direction in which each of the throttle channels 41, 42, 43 is formed (the axial direction of the channels) is shifted from the center of the rotor 3 every 60 degrees as in the first embodiment. Yes. The throttle channels 41, 42, 43, and the axes of the inlet port 21 and the outlet port 22 are all located on the same plane. Accordingly, an intersection 44 where the throttle channels 41, 42, 43 intersect is formed at the center of the rotor 3, and each of the throttle channels 41, 42, 43 is connected to the ports 21, 22 by the rotation of the rotor 3. It is supposed to be able to communicate with.
[0039]
In addition, throttle adapters 41a, 42a, and 43a (throttle diameter changing means) that are fitted by screwing are attached while the throttle channels 41, 42, and 43 communicate with the outlet port 22 from the intersecting portion 44. .
[0040]
Each of the throttle adapters 41a, 42a, 43a is formed in a cylindrical shape having an outer peripheral portion that is the same shape, and a female thread portion formed on the inner wall of each of the throttle channels 41, 42, 43 on the outer peripheral portion. A male screw portion is formed to be screwed onto the screw. On the other hand, the internal structures of the respective aperture adapters 41a, 42a, 43a are different from each other, and aperture portions having aperture diameters of φ0.2 mm, φ0.4 mm, and φ0.6 mm are respectively formed. And from both opening parts of each aperture adapter 41a, 42a, 43a to an aperture | diaphragm | squeeze part, it forms with the gently tapered wall surface. Each of these aperture adapters 41a, 42a, 43a can be appropriately replaced according to the specifications.
[0041]
Next, operations and actions for performing fluid flow rate adjustment and the like in the flow rate adjusting device 1 having the above-described configuration will be described.
When the operation knob 4 shown in FIG. 6 (a) is rotated manually or using power to connect the first throttle passage shown by reference numeral 41 to the inlet port 21 and the outlet port, it is introduced from the inlet port 21. The fluid flows through the first throttle channel 41 and flows into the intersection 44. The fluid that has flowed into the intersection 44 flows into the second and third throttle channels 42 and 43, which are other throttle channels, and the apertures of these throttle channels 42 and 43 are blocked by the inner wall of the housing 2. As a result, fluid does not circulate. Therefore, the fluid that has flowed into the intersecting portion 44 flows again through the channel located on the same axis, that is, the first throttle channel 41, and passes through the throttle adapter 41a in this process, thereby adjusting the flow rate and pressure. In this state, it is sent out from the exit port 22.
[0042]
The fluid that has flowed into the second and third throttle channels 42 and 43 leaks into a slight gap between the rotor 3 and the housing 2, but the housing 2 is supported by the O-ring 51 positioned on the upper side of the rotor 3. And the O-rings 52 and 53 provided surrounding the openings of the ports 21 and 22 do not merge with the inlet port 21 and the outlet port 22.
[0043]
Then, by rotating the operation knob 4 from the above state by 60 degrees, the second throttle channel 42 communicates with the inlet port 21 and the outlet port 22, and the throttle part of the throttle adapter 42a provided here Accordingly, the flow rate and pressure are adjusted and the fluid is sent out from the outlet port 22.
Even when the third throttle channel 43 communicates with the inlet port 21 and the outlet port 22, the fluid flow rate and pressure are adjusted according to the throttle adapter 43 a provided therein.
[0044]
According to the flow control device 1 of the present embodiment described above, the following effects can be obtained.
The flow rate or pressure of the fluid introduced from the inlet port 21 can be appropriately adjusted using any one of the throttle channels 41, 42, 43 selected by the rotation of the rotor 3. As a result, it is not necessary to cut a circuit through which the fluid flows in order to adjust the flow rate, and the flow rate can be controlled easily and quickly by the throttle. Further, each throttle channel 41, 42, 43 can be formed so as to penetrate in the same manner toward the center of the rotor 3, and the manufacturing cost can be reduced by facilitating the manufacturing.
Further, since the diameter of the throttle can be changed according to the attachment state of the throttle adapters 41a, 42a, 43a, the control range such as flow rate adjustment of the present apparatus can be expanded to improve versatility.
The throttle adapters 41a, 42a, 43a are fixed throttles, and the throttle portions of the throttle adapters 41a, 42a, 43a are formed by tapered wall surfaces, so that accurate and stable flow rate adjustment or pressure adjustment is possible. It can be performed.
[0045]
[Third Embodiment]
Next, a third embodiment of the flow rate adjusting device of the present invention will be described with reference to FIGS. The configuration of this embodiment is different in the structure of the rotor 3 compared to the configurations of the first and second embodiments. Therefore, the structure of the different rotor 3 will be described in detail, and the rotor 3 is inserted. The description of the operation knob attached to the housing and the upper end of the rotor 3 will be omitted.
[0046]
FIG. 7 is a diagram for explaining the structure of the rotor 3 provided in the flow rate adjusting device 1 according to the present embodiment. FIG. 7A is a partial cross-sectional view of the rotor 3 when viewed in a cross section including one of the throttle channels. , (B) is a plan view when the rotor 3 is viewed from above. In the rotor 3, a plurality of throttle channels 61 to 66 that are positioned at the same height as the inlet port and the outlet port of the fluid formed in the housing are formed so as to penetrate the rotor 3.
[0047]
Each throttle channel 61-66 is formed so as to have the required throttle diameter in all channel lengths, and the center of the rotor 3 where these throttle channels 61-66 intersect each other in the previous embodiment. A merge space 70 is formed which functions in the same manner as the intersection described above. The merge space 70 is formed as a hole upward from the lower surface of the rotor 3 along the rotation axis.
[0048]
The direction in which the throttle channels 61 to 66 are formed is formed at an equal interval of 30 degrees with respect to the center of the rotor 3 as indicated by the hatched lines in FIG. Thus, every time the rotor 3 is rotated 30 degrees with respect to the housing, any one of the plurality of throttle channels 61 to 66 communicates with the inlet port 21 and the outlet port 22.
[0049]
When the openings of the throttle channels 61 to 66 are respectively viewed from the front, as shown in FIG. 8A showing the arrow J in FIG. The throttle channel 61 is formed so as to penetrate the rotor 3 in the direction perpendicular to the paper surface.
Then, as shown in FIG. 8 (b) showing the arrow K in FIG. 7 (b) rotated 30 degrees from this state, the second throttle channel 62 having a throttle diameter of φ0.4 mm is formed in the rotor 3. Is formed so as to penetrate through the vertical direction of the drawing.
[0050]
When further rotated by 30 degrees, a third throttle channel 63 having a throttle diameter of φ0.6 mm is formed as shown in FIG. 8C showing the arrow L in FIG. 7B. Further, as shown in FIG. 8 (d) showing the arrow M in FIG. 7 (b), a fourth throttle channel 64 having a throttle diameter of φ0.8 mm is formed, As shown in FIG. 8 (e) showing the arrow N in FIG. 7 (b), a fifth throttle channel 65 having a diameter of φ1.0 mm is formed, and FIG. 7 (b). As shown in FIG. 8F showing the arrow P, a sixth throttle channel 66 having a throttle diameter of φ1.2 mm is formed.
[0051]
Therefore, when the rotor 3 formed in this way is inserted into a housing having an inlet port and an outlet port in a straight line, the fluid inserted from the inlet port communicates with any one of the throttle channels 61 to communicate with the outlet port. The flow rate adjustment and the pressure adjustment are performed through 66. And as control of this apparatus 1 in flow volume adjustment etc., six settings which are the number of throttling flow paths 61-66 are enabled.
[0052]
According to the flow rate adjusting device 1 according to the present embodiment described above, it is possible to realize the flow rate adjusting device 1 that has many settings and can finely cope with various required flow rates and pressure adjustments. it can. In addition, since the cutting channels 61 to 66 can be formed by inserting a cutting tool up to the joining space 70, it can be manufactured easily and inexpensively. Further, since the throttle is fixed in shape as in the previous embodiment, accurate and stable flow rate adjustment and the like can be performed.
[0053]
【The invention's effect】
As described above, according to the flow rate adjusting device of the present invention, the following effects can be obtained.
According to the first aspect of the present invention, the rotor having a plurality of throttle channels is rotatably provided in the housing, and the fluid inlet port and the outlet communicate with any one of the throttle channels according to the rotation of the rotor. Since the port is a flow rate adjusting device provided in the housing, the flow rate or pressure of the fluid introduced from the inlet port is appropriately adjusted using any one throttle channel selected by the rotation of the rotor. Can do. In addition, by using each fixed throttle channel, accurate and stable flow rate adjustment can be performed.
[0055]
In addition, both openings of each throttle channel are formed substantially the same as the opening shape of the inlet port and the outlet port, and a throttle part having a predetermined throttle diameter is provided between both openings, and each of these throttle parts Are provided so as to be positioned differently in the rotation axis direction of the rotor. Therefore, the flow rate can be adjusted by using each throttle channel independently, and the flow of the fluid is not affected by other throttle channels. Moreover, the flow of the fluid becomes smooth by removing the step of the throttle channel with respect to the inlet port and the outlet port. Therefore, a stable flow can be guided and the flow rate and pressure can be adjusted reliably and with high accuracy.
[0056]
According to the flow rate adjusting device of the second aspect of the present invention, the flow from the both openings to the throttle portion of each throttle channel is formed with a continuous curved surface, so that the fluid flows smoothly and the pressure loss Can be reduced. Therefore, it is possible to realize a flow rate adjusting device that improves performance in flow rate adjustment and obtains high reliability.
[Brief description of the drawings]
FIGS. 1A and 1B are diagrams illustrating a configuration of a flow rate adjusting device according to a first embodiment of the present invention, where FIG. 1A is an external view, and FIG. 1B is a cross-sectional view including the axes of an inlet port and an outlet port. .
FIG. 2 is a diagram for explaining the configuration of a rotor provided in the flow rate adjusting device according to the first embodiment of the present invention, and a front view of the opening portion of the first throttle channel as viewed from the front, and the front view thereof; It is sectional drawing in the AA cross section.
FIG. 3 is a diagram for explaining the configuration of a rotor provided in the flow rate adjusting device according to the first embodiment of the present invention, and is a front view of the opening of a second throttle channel as viewed from the front, and this front view; It is sectional drawing in the BB cross section.
FIG. 4 is a diagram for explaining the configuration of a rotor provided in the flow rate adjusting device according to the first embodiment of the present invention, and a front view of the opening of a third throttle channel as viewed from the front, and this front view; It is sectional drawing in CC cross section.
5A and 5B are cross-sectional views orthogonal to the rotation axis of the rotor provided in the flow rate adjusting device according to the first embodiment of the present invention, wherein FIG. 5A is a cross-sectional view taken along the A1-A1 cross section of FIG. Is a cross-sectional view taken along the B1-B1 cross section of FIG. 3, and (c) is a cross-sectional view taken along the C1-C1 cross section of FIG.
6A and 6B are diagrams illustrating the configuration of a flow rate adjusting device according to a second embodiment of the present invention, in which FIG. 6A is a cross-sectional view including the axes of an inlet port and an outlet port, and FIG. It is sectional drawing in D1-D1 cross section.
FIG. 7 is a diagram for explaining a configuration of a rotor provided in a flow rate adjusting device according to a third embodiment of the present invention, in which (a) is a partial cross-sectional view when viewed in a cross section including one of throttle channels; , (B) is a plan view when the rotor is viewed from above.
FIG. 8 is a front view for explaining the opening of each throttle channel when the rotor provided in the flow rate adjusting device according to the third embodiment of the present invention is rotated by 30 degrees.
[Explanation of symbols]
1 Flow control device
2 Housing
3 Rotor
4 Operation knob
21 entrance port
22 Exit port
31-33, 41-43, 61-66 Each throttle channel
Each throttle part 31a, 32a, 33a
31b, 31c, 32b, 32c, 33b, 33c Tapered wall surface (curved surface)
41a, 42a, 43a each aperture adapter (diaphragm diameter changing means)
44 Intersection
70 Junction space (intersection)

Claims (2)

A rotor having a plurality of throttle channels is rotatably provided in the housing, and a fluid inlet port and an outlet port communicating with any one of the throttle channels according to the rotation of the rotor are provided in the housing. ,
Each of the throttle channels has a throttle part in which both the opening parts are formed substantially the same as the opening shapes of the inlet port and the outlet port and have a predetermined throttle diameter between the two opening parts. With
These throttle parts are provided so as to be positioned differently in the direction of the rotation axis of the rotor.   The flow rate adjusting device according to claim 1, wherein a space between the openings and the throttle portion is formed as a continuous curved surface.

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