CN109027406B

CN109027406B - Flow control valve

Info

Publication number: CN109027406B
Application number: CN201810455326.1A
Authority: CN
Inventors: 上田一廣
Original assignee: Nihon Pisco Co Ltd
Current assignee: Bisk, Japan
Priority date: 2017-06-09
Filing date: 2018-05-14
Publication date: 2020-09-29
Anticipated expiration: 2038-05-14
Also published as: JP6511091B2; TW201903546A; TWI763809B; KR20180134747A; KR102398700B1; JP2018204777A; CN109027406A

Abstract

A flow control valve is provided, which can display the rotation number of an operation part from a display window through a simple structure and can realize miniaturization. A flow control valve (1) is configured to include: a needle valve element (5) which is supported rotatably within a housing (6) about a first rotation axis (P1) and which adjusts the opening degree of a flow path; an operation part (2) which is provided with a connecting part (21) connected with the needle valve core (5) at the inner side and is supported by a shell (6) to rotate around a first rotating shaft (P1); and a display unit (3) supported so as to be rotatable about a second rotation axis (P2) along the inner surface of the housing (6), wherein an external gear (25) for rotating the display unit (3) about the first rotation axis (P1) is formed at the connection unit (21), an internal gear (35) for meshing with the external gear (25) about the second rotation axis (P2) is formed at the display unit (3), and the character indicating "N" in the first character (41) is aligned with the first display window (61) at a position where the operation unit is rotated N times from the starting point.

Description

Flow control valve

Technical Field

The present invention relates to a flow rate control valve, and more particularly, to a flow path control valve capable of displaying an opening degree value of a flow path.

Background

The flow control valve is a small-sized device that controls the speed of an actuator while restricting the flow of fluid, and is often used in an automated equipment line or the like that assembles a mechanical device, an electronic device, or the like. The flow rate control valve is provided with a valve element for adjusting the opening degree of the flow path, and a rotary operation portion (operation grasping portion) that is interlocked with the valve element. In recent years, there has been an increasing demand for a flow control valve having a structure in which the opening degree of a flow path can be confirmed by displaying the number of rotations of the operation unit through a display window.

Conventionally, there is known a flow control valve having the following structure: an operating member that rotates integrally with the needle valve element is rotatably provided in a housing, a gear that meshes with a tooth portion is rotatably supported in the housing, a display ring that meshes with the gear is rotatably supported, and a scale indicating the number of rotations of the needle valve element is printed on the outer peripheral surface of the display ring (patent document 1: japanese patent laid-open No. 2011-043196).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2011-043196

The flow rate control valve described in patent document 1 is a complicated mechanism for displaying the number of rotations of the operation portion through a display window. As described above, if the display mechanism is complicated, the number of parts increases, the parts cost increases, the number of assembly steps increases, and the size of the operation portion increases.

When the size of the operation portion is increased, it is necessary to secure a predetermined size of arrangement space, and there is a limitation in arrangement. For example, it may become difficult to replace an existing flow control valve that does not show a functional type.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a flow rate control valve which can display the number of rotations of an operation portion from a display window and can be miniaturized by adopting a simple configuration of a speed reduction mechanism realized by an internal gear.

As an embodiment, the above technical problem is solved by the following disclosed solving means.

The disclosed flow control valve includes: a housing having a flow path formed therein; a needle valve body rotatably supported in the housing about a first rotation axis to adjust an opening degree of the flow path; an operation unit which is provided with a connection portion connected to the needle valve element on an inner side thereof and is supported by the housing so as to be rotatable about the first rotation shaft; and a display portion having a cylindrical portion on which first characters corresponding to the number of rotations N of the needle valve body are formed at predetermined intervals in a circumferential direction, the display portion being supported by the housing so as to be rotatable about a second rotation axis at a position different from the first rotation axis, a first display window for exposing one of the first characters being formed on a side surface of the operation portion, an external gear being formed on the connection portion about the first rotation axis, an internal gear meshing with the external gear being formed on the display portion about the second rotation axis, the number of teeth of the external gear being set to be smaller than that of the internal gear by at least one, a position of one of the first characters of the cylindrical portion corresponding to a position of one of the teeth of the internal gear one-to-one, and the operation portion being rotated by N turns from a starting point, the character indicating "N" in the first character is aligned with the first display window. Here, N is a positive integer including 0.

According to the disclosed flow control valve, characters indicating the number of rotations "N" of the needle valve body can be displayed from the display window of the operation portion by a simple structure in which an external gear formed in the operation portion is meshed with an internal gear formed in the display portion, thereby realizing a flow control valve that is smaller than a known flow control valve with a display function.

Drawings

Fig. 1 is a schematic view showing an example of a flow rate control valve according to a first embodiment of the present invention, and is a perspective view.

Fig. 2 is a sectional perspective view of the flow control valve of the above embodiment.

Fig. 3 is a development view of the flow control valve according to the above embodiment.

Fig. 4 is a front view of the flow control valve of the above embodiment.

Fig. 5 is a side view of the flow control valve of the above embodiment.

Fig. 6 is a rear view of the flow control valve of the above embodiment.

Fig. 7 is a plan view of the flow rate control valve according to the above embodiment.

Fig. 8 is a sectional view a-a of the flow control valve of the above embodiment.

Fig. 9 is a B-B sectional view of the flow control valve of the above embodiment.

Fig. 10 is a C-C sectional view of the flow control valve of the above embodiment.

Fig. 11 is an explanatory diagram showing a relationship between an external gear and an internal gear of the flow rate control valve of the above embodiment.

Fig. 12 is an explanatory diagram for explaining a relationship between the number of rotations of the flow rate control valve and display characters in the above embodiment.

Fig. 13 is a schematic view showing an example of a flow rate control valve according to a second embodiment of the present invention, which is a perspective view.

Fig. 14 is a development view of the flow rate control valve according to the above embodiment.

Fig. 15 is a front view of the flow control valve of the above embodiment.

Fig. 16 is a side view of the flow control valve of the above embodiment.

Fig. 17 is a rear view of the flow control valve of the above embodiment.

Fig. 18 is a plan view of the flow rate control valve according to the above embodiment.

Fig. 19 is a D-D sectional view of the flow control valve of the above embodiment.

Fig. 20 is a cross-sectional view E-E of the flow control valve of the above embodiment.

Fig. 21 is an explanatory diagram for explaining a relationship between the number of rotations of the flow rate control valve and display characters in the above embodiment.

Detailed Description

(first embodiment)

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. The flow rate control valve 1 of the present embodiment is a member having an L-shaped pipe body (bent pipe). Fig. 1 is a perspective view (schematic view) showing an example of a flow rate control valve 1 according to a first embodiment. Fig. 2 is a sectional perspective view of the flow control valve 1 shown in fig. 1. Fig. 3 is a developed view showing the structure of the constituent components of the flow rate control valve 1 shown in fig. 1. In all the drawings for describing the embodiments, members having the same functions are denoted by the same reference numerals, and redundant description thereof may be omitted.

The flow rate control valve 1 of the present embodiment is, for example, assembled (connected) to a flow path through which a pressure fluid (for example, compressed air) flows to an external cylinder constituting an automation line or the like, and controls the operating speed of the cylinder. Here, for convenience of explanation of the positional relationship of the respective parts of the flow rate control valve 1, the orientation is shown by the arrows of up, down, front, and rear in the drawing, but when the flow rate control valve 1 is actually used, the orientation is not limited to these, and any orientation may be used.

As shown in fig. 1 and 2, the flow rate control valve 1 of the present embodiment is configured to have an L-shaped pipe body (bent pipe) in which a first tubular housing 6 and a second tubular housing 8 are combined to form a flow path. The first shell 6 is made of resin such as PBT or POM, and has a bushing insert joint (ブッシュイン for Japanese thermoplastic resin チューブ)6a for thermoplastic resin tubes at an end portion thereof. The second housing 8 is made of metal such as brass or stainless steel, and has a screw-in type joint 8a at an end portion thereof. The bushing built-in joint 6a for a thermoplastic resin pipe is also called a trigger type joint. As a constituent material of the flow rate control valve 1, a resin material (for example, PBT, POM, or the like) or a metal material (for example, brass, stainless steel, or the like) can be used as appropriate depending on the use conditions, in addition to a portion using a rubber material such as a gasket 75 or O-

rings

76, 77, which will be described later.

A needle valve core 5 for adjusting the opening degree of the flow path is provided in the

housings

6 and 8. In the example shown in fig. 3, the needle valve core 5, the gasket 75, the cage 73, and the O-ring 76 are assembled in the valve seat 71, and then the valve seat 71 is fitted into the first housing 6, and the first housing 6 and the second housing are combined via the O-ring 77. The display unit 3 and the operation unit 2 are assembled to the first housing 6.

The operation portion 2 is formed in a hat shape, and a cylindrical connecting portion 21 is provided inside. The connecting portion 21 is fitted into the needle valve core 5 and connected slidably. The head portion 5a of the needle valve body 5 is inserted into the hole portion 21a formed in the connecting portion 2 and fitted. The lower portion of the operation portion 2 is rotatably fitted into the upper portion of the first housing 6. The operation unit 2 has a push-lock structure, and is locked so as not to rotate when the operation unit 2 is pushed down, and is unlocked so as to be rotatable when the operation unit 2 is pulled up. The operation portion 2 and the needle valve core 5 are supported by the first housing 6 so as to be rotatable about a first rotation axis P1.

The display portion 3 is an integral structure of the tube portion 3a and the flange portion 3b, and has first characters 41 formed on a side surface of a lower side of the tube portion 3a, second characters 42 formed on a side surface of an upper side of the tube portion 3a, and third characters 43 formed on the flange portion 3 b. For example, printed with

letters

41, 42, 43. For example, characters may be formed by unevenness in a mold in advance, and the tube portion 3a, the flange portion 3b, and the

characters

41, 42, and 43 may be integrally molded by resin molding to form the display portion 3. The display unit 3 is supported to be rotatable about a second rotation axis P2 along the inner surface of the first housing 6.

Here, in a front view, a fourth display window 64 for exposing one of the first characters 41 and a fifth display window 65 for exposing one of the second characters 42 are formed in a side surface of the first housing 6. The position of the fifth display window 65 is located at a position directly above the fourth display window 64. According to the present embodiment, since the fourth display window 64 and the fifth display window 65 are provided at specific positions, only when the operation portion 2 is rotated by an integral multiple of 0.5 rotation, one of the first characters 41 or one of the second characters 42 can be visually confirmed. That is, both the first letter 41 and the second letter 42 cannot be visually confirmed at the incomplete rotational position. Thus, the reading error of the number N of rotation turns can be prevented. In the present specification, N is a positive integer including 0. The positions of the fourth display window 64 and the fifth display window 65 are not limited to the front side, and the positions of the fourth display window 64 and the fifth display window 65 may be changed to the side or the rear side.

In addition, a third display window 63 is formed on the top surface of operation unit 2 so as to expose one of third characters 43 in a plan view.

Fig. 4 is a front view, fig. 5 is a side view, fig. 6 is a rear view, and fig. 7 is a plan view of the flow control valve 1. Fig. 8 is a sectional view a-a of fig. 4. Fig. 9 is a sectional view taken along line B-B of fig. 4. Fig. 10 is a sectional view taken along line C-C of fig. 5.

Here, a first display window 61 is formed on a side surface of the operation portion 2 in a front view to expose one of the first characters 41. The state of the needle valve body 5 rotated by 0 turn is set as an initial state, and the above state is set as a starting point. For example, the needle valve element 5 abuts on the valve seat 71, and the flow path is closed.

In the present embodiment, the character indicating "N" in the first characters 41 is aligned with the first display window 61 at a position where the operation unit 2 is rotated from the starting point by N turns. That is, after the operation unit 2 is rotated N times in the predetermined direction from the initial state, the needle valve core 5 is rotated N times, and the character indicating "N" of the first characters 41 is exposed in the first display window 61.

As shown in fig. 9, the first rotating shaft P1 and the second rotating shaft P2 are located at different positions. The coupling portion 21 is formed with an external gear 25 for rotating the display portion 3 about the first rotation axis P1. Further, the display unit 3 is formed with an internal gear 35 that meshes with the external gear 25 about the second rotation axis P2.

Fig. 11 is an explanatory diagram showing a relationship between the external gear 25 and the internal gear 35 of the flow rate control valve 1. Here, the number of teeth Z1 of the external gear 25 is set to be at least one less than the number of teeth Z2 of the internal gear 35, and is expressed by the following equation Z1 — Z2-1. This is because, when the difference between the tooth number Z1 and the tooth number Z2 is 2 or more, the external gear 25 interferes with the internal gear 35 when rotating, and becomes inoperable or impossible to be downsized. In the example of fig. 11, the number of teeth Z1 of the external gear 35 is 15, and the number of teeth Z2 of the internal gear 35 is 16. The number of teeth Z1 and Z2 is an example, but not limited thereto.

The first characters 41 are formed on the cylindrical portion 3a at predetermined intervals in the circumferential direction. The second characters 42 are formed on the cylindrical portion 3a at predetermined intervals in the circumferential direction. Third letters 43 are formed at predetermined intervals in the circumferential direction on the flange portion 3 b. In the examples of fig. 3 and 11, the first character 41, the second character 42, and the third character 43 are sequentially displayed as positive integers represented by 0 to 14, respectively. The first, second, and

third letters

41, 42, and 43 are examples, and are not limited thereto.

Further, one position of the first letter 41 and the second letter 42 of the cylindrical portion 3a corresponds one-to-one to one position of the teeth of the internal gear 35. Further, the position of one of the third characters 43 of the flange portion 3b corresponds one-to-one to the position of one of the teeth of the internal gear 35 (fig. 11 and the like). In addition, one of the third characters 43 is not formed at one position of the teeth of the internal gear 35, but is formed as a blank. In the example of fig. 11, a space is formed between "0" and "14".

As shown in fig. 11, in the present embodiment, the center position of the outer periphery of the first casing 6 is located on the first rotation axis P1, and the center position of the inner periphery of the first casing 6 is located on the second rotation axis P2. Further, the center position of the display portion 3 is located on the second rotation axis P2. That is, the inner circumference of the first housing 6 is eccentric with respect to the outer circumference of the first housing 6. As an example, the thickness of the peripheral wall portion is varied to realize an eccentric structure.

The interval G between the first rotation shaft P1 and the second rotation shaft P2 is set to a value greater than 0.5 times the tooth full height (japanese: full たけ) H1 of the external gear 25. Further, the interval G between the first rotation shaft P1 and the second rotation shaft P2 is set to a value greater than 0.5 times the tooth full height H2 of the internal gear 35. According to the above configuration, the operation in which the teeth of the internal gear 35 are shifted by one position when the external gear 25 rotates 1 rotation becomes a reliable operation. According to the speed reducing mechanism of the present embodiment, the external gear 25 and the internal gear 35 can be directly interlocked with each other without using any other member.

According to the present embodiment, the display mechanism is simplified, the number of parts is minimized, the cost of parts is minimized, the number of assembly steps is reduced, and the restriction on the arrangement is eliminated. As a result, the flow rate control valve 1 can be made smaller than a known flow rate control valve with a display function by reducing the size of the operation unit 2. For example, it becomes easy to replace an existing flow control valve which does not show the function type.

Fig. 12 is an explanatory diagram for explaining a relationship between the number of rotations N of the flow rate control valve 1 and the display letter "N". In the initial state, the first characters 41 are visually confirmed as "0", the second characters 42 are not visually confirmed, and the third characters 43 are visually confirmed as "0" in the main view.

Next, when the operation portion 2 is rotated 0.5 turns counterclockwise (in the direction of arrow R1 in fig. 1) in a plan view, the first character 41 cannot be visually recognized, the second character 42 is visually recognized as "0", and the third character 43 is visually recognized as a scale mark between "0" and "1". Here, a character "5" is formed at a position adjacent to the second display window 62 on the side surface of the operation portion 2, and the whole can be visually recognized as "0.5".

After the operation unit 2 is further rotated 0.5 turns for 1 turn in total, the first character 41 is visually recognized as "1", the second character 42 is not visually recognized, and the third character 43 is visually recognized as "1".

After the operation unit 2 is further rotated 0.5 turns and the total number of turns is 1.5 turns, the first character 41 cannot be visually recognized, the second character 42 is visually recognized as "1", and the third character 43 is visually recognized as a scale mark between "1" and "2". Here, a character "5" is formed at a position adjacent to the second display window 62 on the side surface of the operation portion 2, and the whole can be visually recognized as "1.5".

In the present embodiment, the character indicating "N" in the third character 43 is aligned with the third display window 63 at a position where the operation portion 2 is rotated from the starting point by N turns. Further, the character indicating "N" in the second characters 42 is aligned with the second display window 62 at a position where the operation portion 2 is rotated N times from the starting point and is continuously rotated 0.5 times. That is, after the operation unit 2 is rotated N times in the predetermined direction from the initial state, the needle valve core 5 is rotated N times, and the characters indicating "N" in the first characters 41 are exposed in the first display window 61, and the characters indicating "N" in the third characters 43 are exposed in the third display window 63. Further, a character "5" is formed in the side surface of the operation unit 2 adjacent to the second display window 62, and after the operation unit 2 is rotated N times in the predetermined direction and further rotated 0.5 times, the character "N" in the second character 42 is exposed in the second display window 62, and the whole can be identified as "N" and "5".

(second embodiment)

The flow rate control valve 1 of the present embodiment is a member having an I-shaped pipe body (union (japanese: ユニオン)). The second embodiment will be described mainly focusing on differences from the first embodiment.

Fig. 13 is a perspective view (schematic view) showing an example of a flow rate control valve 1 according to a second embodiment. Fig. 14 is an expanded view showing the components of the flow rate control valve 1 shown in fig. 13. The flow rate control valve 1 of the present embodiment is configured by combining a first tubular housing 6 and a second tubular housing 8 to form a flow path, thereby forming an I-shaped pipe body (union). The second housing 8 is made of resin such as PBT or POM, and a bushing built-in joint 8b for a thermoplastic resin pipe is provided at an end portion thereof.

housings

6 and 8. In the example shown in fig. 14, the valve body 5, the cage 73, the gasket 75, and the O-ring 76 are assembled to the valve seat 71, and then the valve seat 71 is assembled to the first housing 6, and the first housing 6 and the second housing are assembled with the O-ring 77 interposed therebetween. The display unit 3 and the operation unit 2 are assembled to the first housing 6.

Fig. 15 is a front view, fig. 16 is a side view, fig. 17 is a rear view, and fig. 18 is a plan view of the flow control valve 1. Fig. 19 is a cross-sectional view taken along line D-D of fig. 15. Fig. 20 is a cross-sectional view E-E of fig. 16.

Fig. 21 is an explanatory diagram for explaining a relationship between the number of rotations N of the flow rate control valve 1 and the display letter "N". In the initial state, the first characters 41 are visually confirmed as "0", the second characters 42 are not visually confirmed, and the third characters 43 are visually confirmed as "0" in the main view.

Next, when the operation portion 2 is rotated 0.5 turns counterclockwise (in the direction of arrow R1 in fig. 13) in a plan view, the first character 41 cannot be visually recognized, the second character 42 is visually recognized as "0", and the third character 43 is visually recognized as a scale mark between "0" and "1". Here, a character "5" is formed at a position adjacent to the second display window 62 on the side surface of the operation portion 2, and the whole can be visually recognized as "0.5".

After the operation unit 2 is further rotated 0.5 turns and rotated 1 turn in total, the first character 41 is visually recognized as "1", the second character 42 is not visually recognized, and the third character 43 is visually recognized as "1".

When the operation unit 2 is further rotated 0.5 turns and the total rotation is 1.5 turns, the first character 41 cannot be visually recognized, the second character 42 is visually recognized as "1", and the third character 43 is visually recognized as a scale mark between "1" and "2". Here, a character "5" is formed at a position adjacent to the second display window 62 on the side surface of the operation portion 2, and the whole can be visually recognized as "1.5".

In the present embodiment, the position of the first letter 41 displayed on the first display window 61 can be changed to any position by adjusting the assembly fixing position of the first housing 6 and the second housing 8. In the example shown in fig. 15 and the like, the setting is such that one of the first characters 41 is displayed from the first display window 61 when the position of the first display window 61 is on the front surface side, but the setting is not limited to this, and the setting can be changed to any position including the side surface side or the back surface side. For example, even when there is a limitation in the arrangement of the connection point of the joint in the robot line or the like, the position where one of the first characters 41 is displayed on the first display window 61 is adjusted to a position where the operator can easily visually recognize the position, and the visibility when the numerical value of the opening degree of the flow path is displayed is improved.

The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the scope of the present invention. In the above-described embodiment, the second display window 62 is disposed at a position directly above the first display window 61, the character indicating "N" in the first character 41 is displayed from the first display window 61 at a position where the operation unit 2 is rotated by N turns from the starting point, the character indicating "N" in the first character 42 is displayed from the second display window 62 at a position where the operation unit 2 is rotated by +0.5 turns from the starting point, and the character indicating ". 5" is formed at a position adjacent to the second display window 62, so that the entire character can be recognized as "n.5". For example, the first display window 61 and the second display window 62 may be arranged on opposite sides so that the same number of rotations can be visually confirmed.

In the above embodiment, the configuration in which the number of rotations can be visually confirmed every 0.5 rotations has been described. The number of rotations can be visually confirmed every 0.25 rotation. In the above embodiment, a configuration having the first display window 61, the second display window 62, and the third display window 63 will be described. Without being limited thereto, there are also a case where only the first display window 61 is provided, a case where the first display window 61 and the second display window 62 are provided, and a case where the first display window 61 and the third display window 63 are provided. The plurality of flow rate control valves 1 may be formed as an integrated structure and may be formed as a plurality of flow path flow rate control valves.

Claims

1. A flow control valve, comprising:

a housing formed with a flow path;

a needle valve body supported rotatably in the housing about a first rotation axis to adjust an opening degree of the flow path;

an operation unit which is provided with a connection portion connected to the needle valve element on an inner side thereof and is supported by the housing so as to be rotatable about the first rotation shaft; and

a display unit having a cylindrical portion on which first characters corresponding to the number of rotations N of the needle valve body are formed at predetermined intervals in a circumferential direction, the display unit being supported by the housing so as to be rotatable about a second rotation axis at a position different from the first rotation axis,

a first display window for exposing one of the first characters is formed on a side surface of the operation portion,

an outer gear is formed at the connecting portion with the first rotation shaft as a center,

an internal gear engaged with the external gear is formed on the display part around the second rotation shaft,

the number of teeth of the outer gear is set to be at least one less than the number of teeth of the inner gear,

the interval between the first rotating shaft and the second rotating shaft is set to a value 0.5 times larger than the entire height of the teeth of the outer gear,

the position of one of the first characters of the barrel part corresponds to the position of one of the teeth of the internal gear one by one,

and a character indicating N among the first characters is aligned with the first display window at a position where the operation portion is rotated from a start point by N turns, where N is a natural number.

2. The flow control valve of claim 1,

second characters corresponding to the number of rotations N are further formed on the cylinder part at predetermined intervals in the circumferential direction,

a second display window for exposing one of the second characters is formed on the side surface of the operation part,

the position of the second display window is offset with respect to the position of the first display window by an amount equivalent to 0.5 rotation around the first rotation axis,

the position of the character representing N in the second character is shifted from the position of the character representing N in the first character by an amount equivalent to 0.5 rotation around the second rotation axis as a rotation center,

characters representing '5' are formed at the adjacent position of the second display window on the side surface of the operation part,

the character representing N in the second characters is aligned with the second display window at a position where the operation portion is rotated from the starting point by N turns and continues to be rotated by 0.5 turn.

3. The flow control valve according to claim 1 or 2,

the display part has a flange part provided on the cylinder part,

third characters corresponding to the number of rotations N are formed at the flange part at predetermined intervals in the circumferential direction,

a third display window for exposing one of the third characters is formed on the upper surface of the operation portion,

the text representing N in the third text is aligned with the third display window at a position rotated by N turns from the starting point.

4. The flow control valve of claim 1, configured such that,

a fourth display window for exposing one of the first characters is formed on a side surface of the housing,

the text representing N in the first text is aligned with the fourth display window at a position rotated by N turns from the starting point.

5. The flow control valve of claim 2, configured such that,

a fifth display window for exposing one of the second characters is formed on the side surface of the shell,

the position of the fifth display window is located at a position directly above the fourth display window,

at a position rotated by N turns from the starting point, the text representing N in the first text is aligned with the fourth display window,

at a position rotated N revolutions from the starting point and further rotated 0.5 revolutions, the text representing N in the second text is aligned with the fifth display window.