JP2013044411A - Flow path switching valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow path switching valve though having a relatively simple structure, in which flow path resistance and pressure loss can be reduced to the extent possible, and the wear of a sealing surface is suppressed, and which is configured to improve durability and the like.SOLUTION: The flow path switching valve includes: a valve body having a valve chamber 6, and a first port 11 and a second port 12 opened on the left and the right of the valve chamber 6; a lift valve 20 equipped with first and second valve elements 21 and 21 having a rubber-made sealing member 30 for opening/closing the first and second ports 11 and 12 formed at the right and left side ends respectively; and a rotary shaft 15 for driving the lift valve 20 to open/close in left/right directions. An approximately linear guide groove 35 into which rod-like fitting portions 29 and 29 of the lift valve 20 are slidably fitted is provided in the horizontal direction on a bottom 5b of the valve chamber 6. A pushing arm 17 is provided on the rotary shaft 15 to protrude in a perpendicular direction thereto so as to move the lift valve 20 along the guide groove 35. In addition, a shaft-like protrusion 25 is provided on the lift valve 20 as a pressed portion which can be pressed by the pushing arm 17.

Description

  The present invention relates to a flow path switching valve such as a three-way valve for switching the flow direction (flow path) of a fluid, and in particular, a lift valve having valve bodies at left and right ends, and opening and closing the lift valve. The present invention relates to a flow path switching valve provided with a rotation shaft (drive device such as a motor) for driving (pushing in the left-right direction).

  As this type of flow path switching valve, in Patent Document 1 below, in a three-way valve in which a pair of inlets and outlets are provided on the left and right sides of a valve body, valve shaft guides are provided on the left and right inlets, respectively, An apparatus is disclosed in which a lift valve is supported so as to be movable in the left-right direction (entrance opening / closing direction) by passing the (center axis) through the valve shaft guide.

Japanese Patent Laid-Open No. 2002-228022

  However, in the flow path switching valve described in Patent Document 1, valve shaft guides are provided at the left and right inlets, respectively, but this valve shaft guide obstructs the flow of fluid, and the flow path resistance, pressure There was a problem that the loss would increase.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to reduce flow resistance and pressure loss as much as possible while having a relatively simple configuration, and to wear the seal surface. An object of the present invention is to provide a flow path switching valve that can also suppress and improve durability.

  In order to achieve the above object, a flow path switching valve according to the present invention basically includes a valve body and a valve main body having a first inlet and a second inlet and outlet that open to the left and right of the valve chamber, A lift valve in which a first valve body part for opening and closing the first inlet / outlet and a second valve body part for opening and closing the second inlet / outlet are provided at left and right side ends, respectively, and the lift valve A substantially linear guide in which a part of the lift valve is slidably fitted in the left-right direction at the bottom and / or ceiling of the valve chamber. A groove or a guide ridge is provided, and in order to move the lift valve along the guide groove or the guide ridge, a push arm protruding in a direction perpendicular to the rotation shaft is provided, and the lift valve Provided with a receiving portion that can be pressed by the push arm. There.

  More preferably, the valve body, a valve body having a first inlet / outlet opening to the left and right of the valve chamber, and a second inlet / outlet, a first valve body part for opening / closing the first inlet / outlet, and the second inlet / outlet. A second valve body for opening and closing the outlet is provided on each of the left and right side ends, and a pivot shaft for opening and closing the lift valve in the left-right direction. A substantially straight guide groove or guide ridge is provided in the left and right direction of the bottom and / or ceiling so that a part of the lift valve is slidably fitted, and the lift valve is connected to the guide groove or guide protrusion. In order to move along the strip, the rotation shaft is provided with a pushing arm that protrudes in a direction perpendicular thereto, and the lift valve is provided with a pressing portion that can be pushed by the pushing arm. It is a feature.

  In a preferred aspect, the lift valve is provided with a shaft-like protrusion that protrudes in the vertical direction as the pressing portion, and the shaft-like protrusion is loosely inserted into the tip of the push arm with a considerable margin. A hole, a notched hole, a C-shaped part, or a U-shaped part is provided.

  In another preferred embodiment, the valve body portion is constituted by a rubber crown or a ball-shaped rubber seal member that is pressed against the opening edge of the inlet / outlet and closes it.

  In another preferred embodiment, the lift valve is provided with two upper and lower pressing portions, and the rotary arm is provided with two upper and lower pressing arms corresponding to the two pressing portions.

  In the flow path switching valve according to the present invention, the lift valve is slidably supported by the guide groove or the guide protrusion provided in the bottom and / or the ceiling of the valve chamber. There is no need to provide a valve shaft guide at the inlet / outlet, and therefore the flow resistance and pressure loss can be reduced as much as possible while having a relatively simple configuration.

BRIEF DESCRIPTION OF THE DRAWINGS One Embodiment (1st Example) of the flow-path switching valve which concerns on this invention is shown, (A) is a front view, (B) is a right view. (A) is a YY sectional view of FIG. 1 (B), (B) is an XX sectional view of FIG. 1 (A), [first inlet / outlet: closed, second inlet / outlet: open] state Is shown. It is sectional drawing similar to FIG. 2, and has shown the [1st entrance / exit and 2nd entrance / exit: Open (intermediate opening degree)] state. FIG. 3 is a cross-sectional view similar to FIG. 2, showing a state of [first entry / exit: open, second entry / exit: closed]. The lift valve used by the 1st example is shown, (A) is a top view and (B) is a side view. The bottom view of the holder used in the 1st example. The rotation axis | shaft and pushing arm which are used in 1st Example are shown, (A) is a side view, (B) is a bottom view. Sectional drawing similar to FIG. 2 which shows the example of improvement (2nd Example) of 1st Example. The rotation axis | shaft and pushing arm which are used in 2nd Example are shown, (A) is a side view, (B) is a bottom view.

  Hereinafter, an embodiment of a flow path switching valve of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment (first example) of a flow path switching valve according to the present invention, in which (A) is a front view, (B) is a right side view, and FIG. 2 (A) is FIG. ), And FIG. 2B is an XX sectional view of FIG.

  The flow path switching valve 1 of the illustrated first embodiment takes the form of a three-way valve, and has a bottomed cylindrical valve body 5 with an open top surface and a lid mounted and fixed to the top surface opening 5a of the valve body 5. And a cylindrical holder 7. A valve chamber 6 having a lid-like holder 7 as a ceiling is defined in the valve body 5, and an inlet / outlet 10 that opens into the valve chamber 6 is provided on the front surface (front surface) and the left and right side surfaces of the valve body 5, respectively. , 11 and 12 are provided. Here, the inlet / outlet provided on the front surface is the inlet 10, and the inlet / outlet provided on the left and right side surfaces are the first outlet 11 and the second outlet 12. The two outlets 12 are opposed to each other with an angular interval of 180 degrees in plan view, and the inlets 10 are arranged at equal angular intervals (90 degrees).

  A lift valve 20 is disposed in the valve chamber 6 so as to be movable in the left-right direction. The lift valve 20 has a base 23 having a rectangular cross section, as can be understood by referring to FIG. 5 in addition to FIGS. 2 (A) and 2 (B). A first valve body portion 21 having a rubber seal member 30 in the shape of a crown or a sphere which is pressed against the opening edge portions (valve seats) 11a, 12a of the first outlet port 11 and the second outlet port 12a and closes them. And a second valve body 22 is provided. More specifically, the first valve body portion 21 and the second valve body portion 22 are received at the side end portion of the base body portion 23 to prevent the rubber seal member 30 from being bent excessively. The rubber seal member 30 is firmly fixed to the base portion 23 by the mounting portion 27 and the mushroom-shaped retaining portion 28.

  Further, near the left and right ends on the lower surface side of the base portion 23 of the lift valve 20, rod-like fitting portions 29 and 29 having a circular cross section project downward. The lower portions of the rod-like fitting portions 29 and 29 are slidably fitted into guide grooves 35 described later.

  A columnar base 24 protrudes upward from the center of the upper surface of the base portion 23 of the lift valve 20, and a pushable arm 17, which will be described later, presses the center of the top of the base 24. A short cylindrical shaft-shaped protrusion 25 serving as a receiving part is provided so as to protrude upward.

  Note that the base portion 23, the base portion 24, the shaft-like protrusion 25, the receiving plate portion 26, the mounting portion 27, the mushroom-shaped retaining portion 28, and the rod-like fitting portions 29, 29 of the lift valve 20 are friction resistant. For example, a Teflon (registered trademark) -based synthetic resin that is small and excellent in slidability is integrally molded.

  On the other hand, in the insertion hole 7a provided in the center of the lid-shaped holder 7, the lift valve 20 is opened and closed in the left-right direction (opening edge portions (valve seats) 11a of the inlet ports 11 and 12). A rotating shaft 15 (moving in the direction of contact with and away from 12a) is supported rotatably. The rotating shaft 15 is arbitrarily rotated in both forward and reverse directions by a rotational drive source such as a stepping motor (not shown).

  Further, a substantially linear guide groove 35 is provided in the left and right direction of the bottom portion 5b of the valve chamber 6 in which the lower portions of the rod-like fitting portions 29, 29 of the lift valve 20 are slidably fitted. For example, the guide groove 35 has a rectangular cross-section with a flat bottom surface, and the intermediate portion excluding the vicinity of both ends of the semicircular plan view located near the opening edge portions (valve seats) 11a and 12a is wide.

  In this embodiment, in order to move the lift valve 20 along the guide groove 35, a push arm 17 projecting in a direction (straight side) perpendicular to the lower end portion of the rotating shaft 15 is integrally provided. In addition, a round hole 18 into which a shaft-like protrusion 25 provided on the lift valve 20 is loosely inserted with a considerable margin is formed at the tip of the push arm 17 (see FIG. 7 in addition to FIG. 2). See).

  In addition, the lower surface of the lid-like holder 7 is provided with a triangular recess 7b with rounded corners in which the push arm 17 is rotatably accommodated within a required angle range, as shown in FIG. ing. The left and right end surfaces of the recess 7b serve as stopper surfaces that limit the excessive rotation of the push arm 17 (the rubber seal member 30 is excessively pressed against the opening edge portions 11a and 12a). .

  In the flow path switching valve 1 of the present embodiment configured as described above, when the rotating shaft 15 is rotated clockwise, for example, in a plan view, to a rotational position as shown in FIG. The axial projection 25 of the lift valve 20 is pushed leftward by the push arm 17, whereby the lift valve 20 is pushed toward the first outlet 11 while being guided by the guide groove 35. The rubber seal member 30 of the portion 21 is pressed against the opening edge 11a of the first outlet 11 to close it. At this time, the second valve body portion 22 moves in a direction away from the second outlet 12, so that the second outlet 12 is fully opened. Thereby, the fluid from the inflow port 10 flows toward the second outflow port 12.

  Subsequently, when the rotation shaft 15 is rotated counterclockwise from the rotation position shown in FIG. 2 to the rotation position as shown in FIG. 3, the axial projection 25 of the lift valve 20 is pushed by the push arm 17. Is pushed rightward, whereby the lift valve 20 is pushed toward the second outlet 12 while being guided by the guide groove 35, and the rubber seal member 30 of the first valve body 21 is moved to the first outlet 11. The first outlet 11 opens away from the opening edge 11a (intermediate opening) and the second valve body 22 approaches the second outlet 12, but until the second outlet 12 is closed. It does n’t come. As a result, the fluid from the inlet 10 flows to both the first outlet 11 and the second outlet 12.

  Further, when the rotation shaft 15 is rotated counterclockwise from the rotation position shown in FIG. 3 to the rotation position as shown in FIG. 4, the axial projection 25 of the lift valve 20 is moved by the push arm 17. The lift valve 20 is pushed toward the second outlet 12 while being guided by the guide groove 35, and the rubber seal member 30 of the second valve body portion 22 is pushed to the second outlet 12. It is pressed against the opening edge 12a to close it. At this time, the first valve body 21 moves in a direction away from the first outlet 11, so that the first outlet 11 is fully opened. Thereby, the fluid from the inflow port 10 flows toward the first outflow port 11.

  In the flow path switching valve 1 of this embodiment having such a configuration, the lift valve 20 is slidably supported by the guide groove 35 provided in the bottom portion 5b of the valve chamber 6, so that it is as in the conventional example. Therefore, it is not necessary to provide a valve shaft guide at the inlet / outlet, and therefore the flow resistance and pressure loss can be reduced as much as possible while having a relatively simple configuration.

  Further, since the sealing is performed only by the rubber seal member 30 provided in the two valve body portions 21 and 22 of the lift valve 20, other seal parts such as packing are not necessary, and the number of parts can be reduced.

  Since it has a structure in which a rubber crown or ball-shaped rubber seal member 30 is pressed against the opening edge portions (valve seats) 11a and 12a of the outlets 11 and 12, there is no concern that the seal surface will slide and wear, and durability The improvement of sex is expected.

  Since the sealing surface (rubber sealing member 30) is a spherical surface, the required sealing performance can be ensured even if a slight inclination occurs.

  In the above embodiment, since the shaft-like protrusion 25 pressed by the push arm 17 is located at the uppermost part of the lift valve 20, an undesired moment may be generated in the lift valve 20.

  Therefore, as shown in FIG. 8, a columnar base portion 24 ′ protrudes downward from the center of the lower surface side of the base portion 23 of the lift valve 20. As shown in FIG. 9, while the short cylindrical shaft-shaped protrusion 25 'as the pressing portion protrudes downward, the rotating shaft 15 is extended downward to be long, and the upper and lower shaft-shaped protrusions are extended. It is possible to provide two upper and lower push arms 17 and 17 ′ so that the portions 25 and 25 ′ can be pressed, and the push arms 17 and 17 ′ can press not only the upper part but also the lower part of the lift valve 20. It is mentioned as an improvement example (2nd Example).

  In this second embodiment, a round hole 18 'is provided with a notch 18a for inserting the shaft-like recesses 25, 25', and the lower push arm 17 'is interfered with the lift valve 20. In order to avoid this, a part thereof is deleted (deletion unit 19).

  In the above embodiment, the guide groove 35 is provided at the bottom of the valve chamber 6. However, the guide groove is also provided at the ceiling of the valve chamber 6 (the lower surface of the lid-like holder 7) and the lift valve is guided to the ceiling. A rod-like fitting portion that can be slidably fitted in the groove may be provided, and a guide protrusion is provided instead of the guide groove, and the lift valve is slidably fitted to the guide protrusion. A groove may be provided.

  Moreover, in the said Example, although the case where this invention was applied to a three-way valve was illustrated, this invention is applicable also to a two-way valve.

DESCRIPTION OF SYMBOLS 1 Flow path switching valve 5 Valve body 6 Valve chamber 7 Cover-shaped holder 10 Inflow port 11 1st outflow port 12 2nd outflow port 15 Rotating shaft 17 Pushing arm 18 Round hole 20 Lift valve 21 1st valve body part 22 1st Two valve element parts 23 Base part 25 Shaft-like protrusion 29 Rod-like fitting part 30 Rubber seal member 35 Guide groove

Claims (5)

A valve body having a valve chamber and a plurality of inlets / outlets opened in the valve chamber, a lift valve provided with at least one valve body for opening / closing the inlet / outlet, and for opening / closing the lift valve A flow path switching valve comprising:
A guide groove or a guide ridge in which a part of the lift valve is slidably fitted is provided at the bottom and / or the ceiling of the valve chamber, and the lift valve extends along the guide groove or the guide ridge. In order to move the rotary shaft, a push arm that protrudes in a direction orthogonal to the rotation shaft is provided, and a push receiving portion that can be pressed by the push arm is provided in the lift valve. Channel switching valve. A valve body having a valve chamber, a valve body having a first inlet / outlet opening to the left and right of the valve chamber and a second inlet / outlet, a first valve body portion for opening / closing the first inlet / outlet, and the second inlet / outlet are opened / closed. A flow path switching valve comprising: a lift valve provided with a second valve body portion for each of left and right side ends; and a pivot shaft for opening and closing the lift valve in the left-right direction,
A substantially linear guide groove or guide ridge in which a part of the lift valve is slidably fitted is provided in the left-right direction at the bottom and / or ceiling of the valve chamber, and the lift valve is guided by the guide. In order to move along the groove or the guide ridge, a push arm that protrudes in a direction orthogonal to the rotation shaft is provided, and a push portion that can be pressed by the push arm is provided on the lift valve. A flow path switching valve characterized by comprising:   The lift valve is provided with a shaft-like protrusion that protrudes in the vertical direction as the pressing portion, and a hole or notch is provided at the tip of the push arm so that the shaft-like protrusion is loosely inserted with a considerable margin. The flow path switching valve according to claim 1, wherein a hole, a C-shaped part, or a U-shaped part is provided.   The said valve body part is comprised by the spherical rubber | gum thru | or the rubber band-shaped rubber seal member which is pressed on the opening edge part of the said entrance / exit, and obstruct | occludes it. The flow path switching valve according to 1.   The lift valve is provided with two upper and lower pressing portions, and the push shaft is provided with two upper and lower pressing arms corresponding to the two pressing portions. Item 5. The flow path switching valve according to any one of Items 1 to 4.

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