JP2019157932A - Fluid control valve - Google Patents

Abstract

To improve durability while securing sealability by a seal member in a fluid control valve.SOLUTION: A seal member 40 disposed on a housing chamber 24 of a body 12 includes a seal surface 46 kept into contact with an outer peripheral surface of a rotatable valve element 14, and a pair of land portions 48a, 48b formed at a radial outer side of the seal surface 46 and extended along a rotating direction of the valve element 14. The land portions 48a, 48b have circular arc-shaped cross sections similarly as the seal surface 46, formed in a manner of being extended to a circumferential outer side from the seal surface 46, and projected to an inner wall surface of the seal main body 42 by a height same as the seal surface 46. As an edge portion 64 of a valve hole 62 is brought into contact with any one of the land portions 48a, 48b before the seal surface 46, when the valve element 14 is rotated, damage of the seal surface 46 due to contact with the valve element 14 can be prevented, and sufficient sealability can be secured.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fluid control valve that is provided on a flow path through which fluid flows and controls the flow rate of the fluid.

  Conventionally, for example, a fluid control valve that is used in a cooling water circuit for cooling an internal combustion engine for a vehicle and controls the flow rate of a fluid such as cooling water is known. In this fluid control valve, for example, as disclosed in Patent Document 1, a substantially cylindrical valve body is rotatably provided inside a valve storage chamber in a valve box, and the valve body has a radial direction. A flow rate control hole is formed therethrough. In addition, an inlet side pipe and an outlet side pipe are respectively connected to both ends of the valve box, and a seal packing that slides on the valve body is provided inside the valve storage chamber so as to be adjacent to the outlet side pipe. ing.

  The valve body rotates while being in sliding contact with the packing, and its flow rate control hole communicates with the inlet side pipe and the outlet side pipe so that the fluid from the inlet side pipe communicates with the outlet side through the flow rate control hole. It flows into the pipe.

JP 2003-232454 A

  In the fluid control valve of Patent Document 1 described above, when the valve body is rotated to switch the communication state between the inlet side pipe and the outlet side pipe, the valve body always operates in a state of sliding contact with the packing. Therefore, for example, when the valve body and the packing are slightly displaced with respect to a predetermined position due to a manufacturing error or assembly error of the valve body or packing, during the opening and closing operation of the valve body, When the corner, which is the boundary between the outer peripheral surface and the end of the flow rate control hole, starts to hit the seat surface of the packing, the corner seals the seal surface of the packing and wear progresses at the same time. There is a problem that the sealing performance is lowered.

  The present invention has been made in consideration of the above-described problems, and an object of the present invention is to provide a fluid control valve capable of improving durability while ensuring sealing performance by a sealing member.

In order to achieve the above object, the present invention provides a body having an inlet for introducing fluid and an outlet for discharging fluid, a valve body rotatably provided in a valve chamber of the body, and a valve And a seal member that contacts the outer peripheral surface of the valve body. The valve body has a valve hole penetrating in a direction orthogonal to the center of rotation of the valve body. In the fluid control valve that switches the communication state between the inlet and outlet,
The seal member is made of an elastic material, and is formed in an annular shape with an arc shape in cross section on the inner wall surface facing the valve body, and the seal surface in which the outer peripheral surface of the valve body is in sliding contact;
A land portion formed outside the sealing surface and extending along the rotation direction of the valve body;
With
The land portion is formed in the same cross-sectional shape as the seal surface, and the seal surface and the land portion protrude toward the valve body side with respect to the inner wall surface.

  According to the present invention, a seal member capable of abutting the valve body is provided in the valve chamber of the body. The seal member is formed of an elastic material, and the valve body is formed in an annular shape with a circular arc shape in cross section. The outer peripheral surface of the seal member can be slidably contacted, and has a land portion extending along the rotation direction of the valve body on the outside of the seal surface, and the land portion is formed in the same cross-sectional shape as the seal surface. A seal surface and a land portion are formed to protrude toward the valve body with respect to the inner wall surface of the seal member facing the body.

  Therefore, when the end of the valve hole starts to contact the seal member during the rotation that rotates the valve body and switches between the valve closed state and the valve open state, the end contacts the land before the seal surface. Therefore, for example, even when the positional relationship between the valve body and the seal member varies due to a manufacturing error or the like, it is possible to prevent the edge from being squeezed against the seal surface and to slide the valve body over the entire inner wall surface. The sliding resistance can be reduced as compared with the case of contact.

  As a result, even when the valve body rotates while sliding on the seal surface of the seal member, the wear of the seal surface due to contact with the end of the valve hole can be suppressed as compared with the fluid control valve according to the prior art. Therefore, the sealing performance between the valve element and the valve body can be ensured over a long period of time.

  Moreover, it is good to form a land part larger than the diameter of a valve hole in the rotating shaft direction of a valve body.

  Furthermore, a pair of land portions may be provided on both sides of the seal surface in the rotation direction of the valve body.

  According to the present invention, the following effects can be obtained.

  That is, the valve chamber of the body is provided with a seal member that can contact the valve body, and the seal member made of an elastic material slides on the outer peripheral surface of the valve body with respect to the seal surface formed in an annular shape with an arc cross section. The land portion that extends along the rotation direction of the valve body has the same cross-sectional shape as the seal surface. Therefore, when the end of the valve hole starts to contact the seal member during the rotation of the valve body between the valve closed state and the valve open state, the end of the valve hole is brought into contact with the land portion before the seal surface. Can do.

  As a result, even when the valve body rotates while being in sliding contact with the seal surface of the seal member, it is possible to prevent galling of the seal surface by the edge-shaped end and to prevent sliding resistance compared to the fluid control valve according to the prior art. Therefore, the durability can be improved by suppressing the wear of the sealing surface, and thus the sealing performance by the sealing member can be ensured for a long period of time.

1 is an overall cross-sectional view of a fluid control valve according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the vicinity of a valve body showing a closed state of the fluid control valve of FIG. 1. It is an external appearance perspective view which shows the sealing member of the fluid control valve of FIG. 4A is a schematic front view of the valve closed state when the sealing member and the valve body are viewed from the introduction portion side, and FIG. 4B is a schematic front view showing a state in the middle of the valve body starting to open from the valve closed state of FIG. 4A. FIG.

  A preferred embodiment of a fluid control valve according to the present invention will be described in detail below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates a fluid control valve according to an embodiment of the present invention. In the following description, the case where the fluid control valve 10 is applied to a cooling water circuit of an internal combustion engine or the like will be described.

  As shown in FIGS. 1 and 2, the fluid control valve 10 includes a body 12, a valve body 14 that is rotatably provided to the body 12, and a valve body 14 that is provided on the body 12 and rotates the valve body 14. The body 12 is made of, for example, a resin material, and includes a main body portion 18 in which the valve body 14 is accommodated, and an introduction portion that protrudes from the main body portion 18 and is supplied with fluid. (Introduction port) 20 and a lead-out portion (outlet port) 22 that protrudes in the opposite direction to the introduction portion 20 with respect to the main body portion 18 and discharges the fluid.

  The main body 18 is formed in, for example, a rectangular cross section, and a storage chamber (valve chamber) 24 in which the valve body 14 is stored is formed at the center thereof, and below the storage chamber 24 (in FIG. A cover member 28 is mounted and closed at the opening portion opened in the direction of arrow A). The main body 18 is formed with a shaft hole 30 extending in the axial direction (direction of arrow B) in the upper portion of the storage chamber 24, and the shaft hole 30 has an packing groove 32 and an annular groove inside. A dust seal 34 is provided.

  On the other hand, on the inner wall surface of the main body 18, a first opening (introduction port) 36 that opens upstream (in the direction of arrow C) and communicates with the introduction unit 20 described later, and opens downstream (in the direction of arrow D). A second opening (leading port) 38 communicating with the lead-out part 22 described later is formed, and the first and second openings 36 and 38 are perpendicular to the axial direction of the main body 18 (directions of arrows C and D). Are formed so as to have a circular shape in cross section and to be straight in the horizontal direction across the storage chamber 24.

  Inside the storage chamber 24, a seal member 40 is provided on the inner wall surface on the upstream side where the first opening 36 is opened.

  As shown in FIGS. 1 to 3, the seal member 40 includes a seal body 42 formed of an elastic material such as rubber and having a rectangular cross section, and is formed in a central portion of the seal body 42 in the thickness direction ( A through hole 44 penetrating in a circular cross-section along the direction of arrows C and D), and an annular seal surface 46 formed on an end surface facing the storage chamber 24 that is the outer peripheral side of the through hole 44. .

  The seal body 42 is formed in a circular arc shape in which an inner wall surface facing the storage chamber 24 is recessed in a direction away from the storage chamber 24, and an annular seal surface 46 is projected from the inner wall surface at a constant height. Is formed. The seal surface 46 is formed in a circular arc shape when viewed from the axial direction of the body 12, is formed to have a substantially constant width in the radial direction of the through hole 44, and is formed so that the outer peripheral surface of the valve body 14 can come into contact therewith. The

  The seal surface 46 is formed so as to protrude by a predetermined height from the inner wall surface of the seal body 42 toward the valve body 14 (in the direction of arrow D).

  Further, the seal body 42 has a pair of land portions 48 a and 48 b provided outside the seal surface 46 in the radial direction and extending along the rotation direction of the valve body 14.

  The land portions 48 a and 48 b have a circular arc shape like the seal surface 46 and are formed so as to extend outward in the circumferential direction from the seal surface 46, and the seal surface 46 and the inner wall surface of the seal body 42. It is formed so as to protrude to the valve body 14 side (arrow D direction) by the same height. That is, the land portions 48 a and 48 b are integrally formed so as to be substantially the same curved surface as the seal surface 46, and one land portion 48 a and the other land portion 48 b penetrate along the rotation direction of the valve body 14. It is provided so as to sandwich the hole 44. In other words, a part of the seal surface 46 is formed so as to extend along the rotation direction of the valve body 14, thereby constituting the land portions 48 a and 48 b.

  Further, as shown in FIG. 4A, the width dimension H of the land portions 48a and 48b is set to be at least larger than the diameter E of the valve hole 62 in the valve body 14 (H> E), and the seal body. It is formed with a predetermined width so as to be symmetrical with respect to the height center of 42.

  As shown in FIG. 2, the seal member 40 contacts the inner wall surface of the first opening 36 with respect to the body 12, and the convex portions 50 formed on both side walls thereof are orthogonal to the inner wall surface. The first opening 36 and the through hole 44 are mounted so as to be coaxial with each other by being inserted into the groove portions 52 on both side walls.

  As shown in FIGS. 1 and 2, the introduction portion 20 is formed in a tubular shape, for example, and protrudes from the one side portion of the main body portion 18 by a predetermined length along the horizontal direction (arrow C direction), and enters the inside thereof. An introduction flow path 54 is formed, and the introduction portion 20 and the storage chamber 24 communicate with each other by communicating with the first opening 36 of the main body portion 18. A tube (not shown) is connected to the end of the introduction unit 20, and a fluid is supplied from a fluid supply source (not shown) to the introduction channel 54.

  The lead-out part 22 is formed in a tubular shape like the introduction part 20 and protrudes from the other side part of the main body part 18 by a predetermined length along the horizontal direction (arrow D direction) so as to be opposite to the introduction part 20. ing. That is, the introduction part 20 and the lead-out part 22 are provided so as to be in a straight line with the main body part 18 interposed therebetween.

  In addition, a lead-out flow path 56 that extends straight from the end portion to the storage chamber 24 is formed inside the lead-out portion 22, and communicates with the second opening 38 of the main body portion 18 so that the lead-out portion 22 and the lead-out portion 22 are stored. The chamber 24 is in communication. A tube (not shown) is connected to the end of the lead-out part 22, and the fluid flowing from the introduction part 20 to the storage chamber 24 is discharged to the coolant circuit of the internal combustion engine (not shown) through the lead-out flow path 56 of the lead-out part 22. Is done.

  The valve body 14 includes, for example, a valve portion 58 housed in the housing chamber 24, and a shaft portion (rotating shaft) extending along the axial direction (the direction of arrow B in FIG. 1) from the center of the upper end portion of the valve portion 58. 60).

  The valve portion 58 is formed of, for example, a cylindrical body having a circular cross section when viewed from the axial direction of the shaft portion 60, and has a valve hole 62 penetrating in a direction orthogonal to the axial direction of the shaft portion 60. The hole 62 has a circular cross section and is formed so as to penetrate the outer peripheral surface of the valve portion 58. Then, the outer peripheral surface of the valve portion 58 rotates while abutting and sliding on the seal surface 46 of the seal member 40 provided on the body 12.

  Further, when the valve portion 58 rotates in the storage chamber 24, the valve portion 62 moves in the rotation direction so that the opening 62 a of the valve hole 62 faces the land portion 48 a (48 b) of the seal member 40.

  The shaft portion 60 is inserted into the shaft hole 30 of the body 12, and the packing 32 and the dust seal 34 are in sliding contact with the outer peripheral surface thereof, so that the shaft portion 60 is rotatably supported with respect to the shaft hole 30 and the shaft hole 30. And the shaft 60 are prevented from leaking fluid from the storage chamber 24, and dust and the like from entering the storage chamber 24 from the outside are prevented. The upper end portion of the shaft portion 60 protrudes outside the main body portion 18 through the shaft hole 30.

  The drive unit 16 is composed of, for example, a rotational drive source such as a DC motor or a stepping motor, and rotates by a predetermined angle in a predetermined direction based on a control signal from a controller (not shown). And the drive part 16 is provided in the upper part of the main-body part 18 in the body 12, and when the upper end part of the axial part 60 is connected, the valve body 14 is stored in the storage chamber 24 via the axial part 60 under the energization action. It rotates in a predetermined direction and at a predetermined angle.

  The fluid control valve 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described.

  First, in the fluid control valve 10, the valve hole 62 of the valve body 14 is positioned perpendicular to the introduction flow path 54 and the discharge flow path 56, so that the valve body 14 causes the introduction flow path 54 and the discharge flow path 56. The valve is closed when communication with is closed. Therefore, the fluid supplied from the fluid supply source (not shown) to the introduction channel 54 of the introduction unit 20 does not flow to the extraction channel 56 of the extraction unit 22 through the storage chamber 24 of the body 12 (see FIG. 4A). .

  Next, when the driving unit 16 is driven based on a control signal from a controller (not shown), the valve unit 14 starts rotating in the counterclockwise direction (in the direction of arrow F in FIG. 2) together with the shaft unit 60. 4B, when the opening 62a of the valve hole 62 is rotated to a position facing the land portion 48a of the seal member 40, the end portion along the circumferential direction of the land portion 48a starts to come into contact.

  At this time, when the edge portion 64 serving as a boundary portion between the outer peripheral surface of the valve portion 58 and the opening 62a of the valve hole 62 comes into contact with the land portion 48a, the manufacturing variation and assembly of the valve body 14, the body 12, and the seal member 40 are reduced. When the valve body 14, the body 12 and the seal member 40 are slightly displaced from a predetermined position due to a variation in the attachment, the end portion near the end where the land portion 48a starts to hit The edge portion 64 may be galling. Even in this case, the edge portion 64 of the valve body 14 comes into contact with the land portion 48a provided on the outer side in the circumferential direction with respect to the seal surface 46, so that the seal surface 46 is prevented from being galled.

  Specifically, even when the edge portion 64 of the valve body 14 comes into contact with the land portion 48a and galling occurs, the outer peripheral surface abuts on the land portion 48a by further rotating the valve body 14. Since it becomes a predetermined position and is guided along the rotation direction, it is possible to prevent the edge portion 64 from galling the seal surface 46.

  Then, when the valve body 14 further rotates and becomes approximately 90 ° with respect to the valve closed state, both end portions of the valve hole 62 in the valve body 14 are respectively in the storage chamber 24 as shown in FIG. It faces the first and second openings 36 and 38, and is in a valve open state in alignment with the introduction flow path 54 and the discharge flow path 56. As a result, the fluid that has been supplied to the introduction passage 54 flows through the valve hole 62 of the valve body 14 to the outlet passage 56 on the downstream side (in the direction of arrow D) and is led out to the cooling water circuit of the internal combustion engine (not shown). Is done.

  The other land portion 48b provided on the opposite side to the one land portion 48a described above is configured so that, for example, the valve body 14 rotates in the opposite direction (clockwise) from the valve closed state to the body 12 in the body 12. In use, the edge portion 64 abuts against the seal surface 46 prior to the land portion 48b, thereby preventing the seal surface 46 from being galled.

  As described above, in the present embodiment, the seal member 40 that is in sliding contact with the valve body 14 is provided in the storage chamber 24 of the body 12, and the seal member 40 is formed of an elastic material and is an annular seal that is in sliding contact with the valve body 14. And a land portion 48a, 48b that is formed on the outer side of the seal surface 46 along the rotational direction of the valve body 14 and has a curved surface identical to the cross section of the seal surface 46. is doing. Accordingly, when the valve body 14 is rotated from the valve closed state or the valve open state, the edge portion 64 formed at the end portion of the valve hole 62 is in contact with the seal member 40 in the middle of the rotation, and galling occurs. However, since the edge portion 64 comes into contact with the land portions 48a and 48b prior to the seal surface 46, the edge portion 64 is prevented from being galled with respect to the seal surface 46.

  As a result, even when the valve body 14 rotates in a state of sliding contact with the seal surface 46 of the seal member 40, the sealing performance between the valve member 14 and the valve body 14 by the seal member 40 is improved as compared with the fluid control valve according to the prior art. Durability can be improved by suppressing wear of the seal surface 46 while ensuring.

  Further, in the seal member 40, by providing the land portions 48a and 48b extending in the circumferential direction which is the rotation direction of the valve body 14, the rigidity of the portion where the valve body 14 starts to contact can be increased. Wear of the seal surface 46 can be further suppressed, and the durability can be further improved.

  Furthermore, by forming the width dimension H of the land portions 48a and 48b larger than the diameter E of the valve hole 62 in the valve body 14, the edge portion 64 of the valve hole 62 can be securely attached to the land portions 48a and 48b. Can be contacted in advance, thereby ensuring that damage to the sealing surface 46 is avoided.

  Furthermore, in the seal member 40, the seal surface 46 and the land portions 48 a and 48 b are provided so as to protrude from the inner wall surface of the seal body 42 to the valve body 14 side. The sliding resistance when the valve body 14 rotates can be reduced as compared with the case where the valve body 14 rotates while sliding on the whole. Therefore, the drive unit 16 for rotating the valve body 14 can be reduced in size, and the power consumption can be reduced.

  Still further, the fluid control valve 10 is not limited to the case where it is applied to a cooling water circuit of an internal combustion engine or the like, for example, a cooling water circuit for cooling a motor or a cooling water circuit for cooling a battery. It may be used for the purpose of controlling the flow of gas such as gas instead of liquid such as cooling water.

  In addition, the fluid control valve according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Fluid control valve 12 ... Body 14 ... Valve body 16 ... Drive part 18 ... Main-body part 24 ... Storage chamber 40 ... Sealing member 46 ... Sealing surface 48a, 48b ... Land part 58 ... Valve part 60 ... Shaft part 62 ... Valve hole 64 ... edge part

Claims (3)

A body having an inlet for introducing fluid and an outlet for extracting fluid, a valve body provided rotatably in a valve chamber of the body, and an outer peripheral surface of the valve body provided in the valve chamber The valve body has a valve hole penetrating in a direction orthogonal to the center of rotation of the valve body, and the introduction port and the guide through the valve hole under the rotational action of the valve body. In the fluid control valve that switches the communication state with the outlet,
The seal member is made of an elastic material, and is formed in an annular shape in a circular arc shape on an inner wall surface facing the valve body, and a seal surface on which an outer peripheral surface of the valve body is in sliding contact,
A land portion formed outside the sealing surface and extending along a rotation direction of the valve body;
With
The fluid control valve, wherein the land portion is formed in the same cross-sectional shape as the seal surface, and the seal surface and the land portion protrude toward the valve body side with respect to the inner wall surface. The fluid control valve according to claim 1.
The fluid control valve according to claim 1, wherein the land portion is formed larger than a diameter of the valve hole in a rotation axis direction of the valve body. The fluid control valve according to claim 1 or 2,
A pair of the land portions are provided on both sides of the seal surface in the rotation direction of the valve body.

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