JP5864157B2 - Air vent valve - Google Patents

Description

The present invention relates to an air vent valve used for fluid piping.

An air vent valve used for piping through which liquid flows, a valve, a valve mechanism that is driven up and down by the float, a valve seat that contacts and separates the valve element, and a casing that houses the valve mechanism; Patent Document 1 discloses an air vent valve having a fluid air inlet and an air outlet formed in a casing.
In the air vent valve of Patent Document 1, the valve body moves up and down, and the upper end surface of the valve body comes into contact with and separates from the valve seat.

JP 2004-245374 A

In the air vent valve of Patent Document 1, impurities and precipitates contained in the fluid attached to the upper end surface of the valve body, which is entrained by the exhaust air and attached to the valve seat of the valve body, are present on the upper end surface of the valve body. It accumulates and there exists a problem that the sealing performance of an air vent valve is impaired.
The present invention has been made in view of the above problems, and an object of the present invention is to provide an air vent valve in which impurities and precipitates contained in a fluid hardly adhere to a contact surface of a valve body with a valve seat.

In order to solve the above problems, in the present invention, the float, the valve body, the valve seat, the spring that biases the valve body in the valve closing direction, the float and the valve body are engaged, and the float is lowered. A valve mechanism having a link mechanism for driving the valve body in the valve opening direction at times, and a casing for housing the valve mechanism, the fluid air inlet and the air outlet are formed in the casing, and the valve body is moved horizontally. Then, the side end surface of the valve body comes into contact with and separates from the valve seat, and a plurality of linear protrusions are formed on the inner peripheral surface of the casing facing the outer peripheral surface of the float. An air vent valve is provided in which the linear protrusion is close to a float outer peripheral surface .
Even if a fluid entrained in air adheres to the end face of the valve body when the air is discharged, it falls downward due to gravity, and thus hardly remains on the end face of the valve body. Accordingly, impurities and precipitates contained in the fluid are unlikely to adhere to the end face on the valve body side, which is a contact surface with the valve seat of the valve body. By being guided by the plurality of linear protrusions, the vertical movement of the float is stabilized and the opening and closing of the valve is stabilized.

In a preferred aspect of the present invention, a plurality of linear protrusions extending horizontally in the circumferential direction are formed on the inner peripheral side surface of the casing facing the outer peripheral side surface of the valve body, and the linear protrusions are formed outside the valve body. Close to the circumferential side.
By being guided by the plurality of linear protrusions, the horizontal movement of the valve body is stabilized and the opening and closing of the valve is stabilized.
In a preferred aspect of the present invention, the casing has a first portion that accommodates the valve mechanism and has an air discharge port, and a second portion that is formed with a fluid air inlet and is connected and fixed to the fluid pipe. The first part is connected to the second part with one touch.
When the valve mechanism has deteriorated over time, the existing casing first part containing the existing valve mechanism may be replaced with a new casing first part containing a new valve mechanism, which facilitates maintenance work. Since the connection between the casing first part and the casing second part is a one-touch connection, the maintenance work is further facilitated.

It is a block diagram of the air vent valve which concerns on the Example of this invention. (A) is a longitudinal cross-sectional view at the time of valve closing, (b) is a bb arrow view of (a), (c) is a partial enlarged view of (b), (d) is ( It is the dd arrow view of a), (e) is the elements on larger scale of (d), (f) is the ff arrow view of (a), (g) is (f) FIG. It is a longitudinal cross-sectional view at the time of valve opening of the air vent valve concerning the Example of this invention.

An air vent valve according to an embodiment of the present invention will be described.
As shown in FIG. 1, the air vent valve A has a vertical cylinder float 1, a horizontal cylinder valve body 2 having a valve body portion 2 a and a valve shaft 2 b, and a side end face of the valve body portion 2 a. An opposed annular valve seat 3, a spring 4 that has one end engaged with a valve body portion 2a and the other end engaged with a washer 5b described later, and urges the valve body 2 in the valve closing direction, a float 1, and a valve body 2, and a casing 6 that accommodates the valve mechanism α.
The link mechanism 5 includes a headed pin 5a protruding from the upper end of the float 1, a washer 5b in which the valve shaft 2b is slidably inserted and screwed to the casing 6, and an end of the valve shaft 2b. A retaining ring 5c locked to the head, a lever 5d having one end 5d 'engaged with the head of the headed pin 5a, and a bent other end 5d "engaged with the washer 5b and engaged with and disengaged from the retaining ring 5c. In the washer 5b, a plurality of through holes 5b ′ are formed in addition to the insertion hole of the valve shaft 2b.
The casing 6 has a first portion 6a in which the valve mechanism α is accommodated and an air discharge port 7 is formed, and a second portion 6b in which a fluid air inlet 8 is formed and connected and fixed to a fluid pipe (not shown). doing. The first portion 6a is connected to the second portion 6b by one-touch using the U pin 9. A connecting portion between the first portion 6 a and the second portion 6 b is sealed by an O-ring 10.
A plurality of linear protrusions 6c are formed on the inner peripheral side surface of the first portion 6a of the casing facing the outer peripheral side surface of the float 1 so as to extend in the circumferential direction with a space therebetween. The linear protrusion 6c is opposed to the plurality of peripheral protrusions 1a formed on the outer peripheral side surface of the float 1 with a minute gap therebetween.
A plurality of linear protrusions 6d extending horizontally and spaced apart from each other are formed on the inner peripheral side surface of the first portion 6a of the casing facing the outer peripheral side surface of the valve body 2a. The linear protrusion 6d is opposed to the outer peripheral side surface of the valve body 2a with a minute gap.

The operation of the air vent valve A will be described.
The air vent valve A is connected and fixed to the water pipe with the casing second portion 6b screwed and fixed to a water pipe (not shown). As shown in FIG. 1, the float 1 is in a vertically placed state, and the valve body 2 is in a horizontally placed state. The air outlet 7 is located above the fluid air inlet 8.
Tap water and air mixed in the tap water flow into the casing 6 through the fluid air inlet 8. The water level WL in the casing 6 is surrounded by the valve seat 3 and slightly below the valve hole 7a that forms a part of the air discharge port 7, and the float 1 floats in the tap water in the casing 6. The other end 5d ″ of the lever 5d of the link mechanism engages with the washer 5b and is disengaged from the retaining ring 5c. The side end surface of the valve body 2a that receives the urging force of the spring 4 comes into contact with the valve seat 3. The valve hole 7a and thus the air discharge port 7 are closed.
The air in the water supply pipe flows into the casing 6 through the fluid air inlet 8, passes through the gap between the outer peripheral side surface of the float 1 and the inner peripheral side surface of the casing 6 facing the outer peripheral side surface, and above the float 1 It flows into the upper part of the casing 6. As shown in FIG. 2, the pressure of the air accumulated in the upper portion of the casing 6 increases to push the water surface downward, and the water level WL in the casing 6 decreases. The float 1 floating in the tap water following the decrease in the water level WL is also guided by the linear protrusion 6c of the casing and descends. One end 5d 'of the lever 5d engaged with the headed pin 5a follows the float 1 and moves downward, and the other end 5d "of the lever 5 is rotated clockwise in the figure around the tip of the other end. The other end base engages with the retaining ring 5c to drive the retaining ring 5c to the right in the figure, and the valve body 2 is horizontally driven to the right in the figure against the biasing force of the spring 4. The side end surface of the valve body 2a is detached from the valve seat 3, and the valve hole 7a and thus the air discharge port 7 are opened.
Air accumulated in the upper part of the casing 6 is released to the external environment through the through hole 5b ′ of the washer 5b, the gap between the outer peripheral side surface of the valve body 2a and the inner peripheral side surface of the casing 6, and the air discharge port 7. Is done.
The air pressure at the top of the casing 6 decreases, the water level WL in the casing 6 rises, the float 1 also moves upward following the rise of the water level WL, and the bent other end 5d ″ of the lever 5 moves the tip of the other end. 2 is rotated counterclockwise in FIG. 2. Following the counterclockwise rotation of the other end 5d ″, the retaining ring 5c and the valve body 2 are under the urging force of the spring 4 in FIG. It moves horizontally in the middle left direction, the side end face of the valve body 2a abuts on the valve seat 3, and closes the valve hole 7a and eventually the air outlet 7. The other end 5d ″ is detached from the retaining ring 5c and contacts only the washer 5b.

In the air vent valve A, the valve body 2 moves horizontally, and the side end surface of the valve body portion 2a comes into contact with and disengages from the valve seat 3, so that when the air is discharged from the casing 6, the tap water taken to the air is discharged. Even if it adheres to the side end surface of the valve body 2a, it falls downward due to gravity and hardly remains on the side end surface of the valve body 2a. Accordingly, impurities and precipitates contained in the tap water are unlikely to adhere to the end face of the valve body 2a, which is a contact surface with the valve seat 3 of the valve body 2, and the sealing performance of the air vent valve A is not easily impaired.
By being guided by the plurality of linear protrusions 6c, the vertical movement of the float 1 is stabilized, and the opening / closing operation of the valve hole 7a by the valve body 2 is stabilized. Since the contact between the float 1 and the linear protrusion 6c is a point contact between the circumferential protrusion 1a and the linear protrusion 6c, the float 1 can move quickly in response to a change in the water level WL in the casing.
By being guided by the plurality of linear protrusions 6d, the horizontal movement of the valve body 2 is stabilized and the opening / closing operation of the valve hole 7a by the valve body 2 is stabilized.
When the valve mechanism α is deteriorated with time, the existing casing first part 6a accommodating the existing valve mechanism α may be replaced with a new casing first part 6a accommodating the new valve mechanism α, so that maintenance work is performed. It becomes easy. Since the connection between the casing first portion 6a and the casing second portion 6b is a one-touch connection, the maintenance work is further facilitated.

Instead of forming the linear protrusions 6c and 6d on the casing 6a, a plurality of linear protrusions may be formed on the peripheral surface of the float 1 and the peripheral surface of the valve body 2a.
The other end 5d ″ of the lever 5 may be in contact with the washer 5b and the retaining ring 5c when the valve is closed. However, a slight amount may be provided between the other end 5d ″ and the retaining ring 5c when the valve is closed. The configuration in which the gap is provided has an advantage that the rotation of the other end 5d ″ accompanying the lowering of the float 1 can be started smoothly.

The present invention can be widely used for an air vent valve.

A Air vent valve 1 Float 1a Circumferential protrusion 2 Valve body 2a Valve body portion 2b Valve shaft 3 Valve seat 4 Spring 5 Link mechanism 6 Casing 6a First portion 6b Second portion 7 Air outlet 7a Valve hole 8 Fluid air inlet 9 U Pin 10 O-ring

Claims (3)

A float, a valve body, a valve seat, a spring that urges the valve body in a valve closing direction, and a link mechanism that engages the float and the valve body to drive the valve body in the valve opening direction when the float is lowered. , A casing housing the valve mechanism, a fluid air inlet and an air outlet are formed in the casing, the valve body moves horizontally, and the side end surface of the valve body abuts on the valve seat A plurality of linear protrusions are formed on the inner peripheral side surface of the casing that is separated and faces the outer peripheral side surface of the float, and extends in the circumferential direction at intervals from each other. The linear protrusions are close to the outer peripheral side surface of the float. An air vent valve characterized by that. A plurality of linear protrusions extending horizontally in the circumferential direction are formed on the inner peripheral side surface of the casing facing the outer peripheral side surface of the valve body, and the linear protrusions are close to the outer peripheral side surface of the valve body. The air vent valve according to claim 1. The casing has a first part that accommodates the valve mechanism and has an air discharge port, and a second part that has a fluid air inlet and is connected and fixed to the fluid pipe. The first part is the second part. The air vent valve according to claim 1, wherein the air vent valve is connected to the portion by one touch.

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