JP2011021752A - Diaphragm valve and dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform the high-speed opening/closing operation of a diaphragm valve by disposing a diaphragm valve at an exhaust valve for releasing back pressure applied to a diaphragm of the diaphragm valve whose opening/closing operation is accelerated by closing bleed holes when the diaphragm valve is closed and opening the bleed holes when the diaphragm valve is opened. <P>SOLUTION: The diaphragm valve 30 separating a valve element 32 from a valve seat 33 by releasing the back pressure applied to the diaphragm 31 having the bleed holes B and including a bleed hole opening/closing means for closing the bleed holes B when the valve element 32 is seated on the valve seat 33 and opening the bleed holes B when the valve element 32 is separated from the valve seat 33 by the displacement of the diaphragm 31 is used as the exhaust valve for releasing the back pressure applied to the diaphragm 13 of the diaphragm valve 1a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a diaphragm valve and a dust collector, and more particularly to a diaphragm valve having improved response performance and a dust collector having an improved pressure air supply valve provided for removing dust adhering to the outer surface of a filter. .

In general, a diaphragm valve is configured such that gas is passed through a gap between the valve seat and the valve body by separating the valve body from the valve seat by releasing back pressure applied to the diaphragm, and there are various types of structures. .
As an example, the diaphragm valve 10 shown in FIGS. 8 to 9 is a so-called full body type diaphragm valve, and includes a main body 15 having a pressure air chamber 15a inside and a lid member 16 having the inside being a valve chamber 16a. The valve body 24 is attached via the diaphragm 13 disposed at the joint between the main body 15 and the lid member 16.
In the main body 15, an intake port 21 and an outer port 22 are opened, and the intake port 21 is connected to a gas supply source (not shown).
And normally, the valve body 24 is pressed against the valve seat 23 by the action of the urging force of the spring 14 and the pressure of the valve chamber 16a (back pressure applied to the diaphragm 13) due to the exhaust valve 18 being closed. Thus, the communication between the intake port 21 and the outer port 22 is blocked, and the pressure gas (hereinafter referred to as “pressure air”) of the gas supply source is blocked (see FIG. 8).

By the way, when opening the diaphragm valve 10, the exhaust port 17 is opened by opening the exhaust valve 18, and the diaphragm 13 is pulled up by releasing the pressure in the valve chamber 16a (back pressure applied to the diaphragm 13). (See FIG. 9).
When the diaphragm valve 10 is closed, the exhaust port 17 is closed by closing the exhaust valve 18, and the pressure air on the pressure air chamber 15a side is supplied to the valve chamber 16a through the bleed hole B formed in the diaphragm 13. Thus, the valve chamber 16a is made equal to the pressure air chamber 15a, and the diaphragm 13 is pushed down by the urging force of the spring 14.

  And this diaphragm valve 10 is used for various uses, such as a valve for pressure air supply provided in order to wipe off the dust adhering to the outer surface of the filter of a dust collector, for example.

  On the other hand, in order to collect dust contained in exhaust gas discharged from incinerators, electric furnaces, etc., dust collectors are widely used, and a large amount of dust adheres to the outer surface of the filter, resulting in a ventilation resistance (pressure loss). When the temperature rises above a predetermined value or after a lapse of a certain time, a condition is selected to remove dust, and compressed air is ejected into the filter to remove dust adhering to the outer surface of the filter.

More specifically, as shown in FIG. 10, the dust collector S ′ for dusting off the dust adhering to the outer surface of the filter divides the interior of the housing 2 up and down by the partition wall 3 and includes the lower part. The dust air introduction chamber 4 has a purified air chamber 5 at the top, the dust containing air introduction chamber 4 is connected to a dust generation source (not shown), and the purified air chamber 5 is connected to a suction device F (for example, , See Patent Document 1).
A large number of bottomed cylindrical filters 7 are suspended and attached to the partition wall 3, and a cleaning air supply pipe 8 for supplying cleaning air is provided above each filter 7. In FIG. 8, the pressure air jet nozzle 6 is attached so as to face the opening of the filter 7.
The cleaning air supply pipe 8 is connected to the outer port 22 of the diaphragm valve 10, and is normally connected in a state where the pressure air supply pipe 9 connected to the intake port 21 of the diaphragm valve 10 is cut off.

Thus, normally, the air containing dust from the dust generation source is guided to the dust-containing air introduction chamber 4 by the suction force of the suction device F connected to the downstream side of the purified air chamber 5 of the housing 2, and the dust is Filtered by the filter 7 and purified air is discharged through the purified air chamber 5.
Then, when dust adheres to the outer surface of the filter 7 and the ventilation resistance reaches a predetermined value, or periodically after a certain period of time, the exhaust valve 18 is opened to periodically open the valve chamber 16a. By releasing the pressure, the diaphragm valve 10 is opened in a short time, and the pressure air in the pressure air supply pipe 9 is instantaneously discharged to the cleaning air supply pipe 8, and the pressure air jet arranged in the cleaning air supply pipe 8 Cleaning air is jetted into the filter 7 from the nozzle 6 so that dust adhering to the outer surface of the filter 7 is removed.

JP 2007-175635 A

By the way, in the conventional diaphragm valve 10, in order to speed up the opening operation of the diaphragm valve 10, it is better to eliminate the bleed hole B or make it as small as possible.
In this way, in the case of a diaphragm in which the bleed hole B is eliminated or made as small as possible, the pressure air on the pressure air chamber 15a side is not introduced into the valve chamber 16a through the bleed hole B (it is difficult to be introduced). When the valve is opened, the pressure difference between the pressure air chamber 15a and the valve chamber 16a is generated most rapidly, and the pressure difference between the pressure air chamber 15a and the valve chamber 16a is maintained, so that the diaphragm valve 10 can be opened. To get faster, it's the best.
However, on the contrary, when the diaphragm valve 10 is closed, even if the exhaust valve 18 is closed, the back pressure applied to the diaphragm 13 (pressure in the valve chamber 16a) does not increase (is unlikely to increase) until a predetermined measure is taken. It takes time for the pressure in the pressurized air chamber 15a and the valve chamber 16a to balance and the valve body 24 to close. During this time, the discharged pressurized air is wasted.
Further, the air of the pressure air source is consumed, and there is a possibility that the next dust removal operation cannot be continuously performed.
Conversely, if the bleed hole is made larger, the closing operation becomes faster, but the pressure air on the pressure air chamber 15a side easily enters the valve chamber 16a through the bleed hole, so that the pressure air when the exhaust valve 18 is opened Since the pressure difference between the chamber 15a and the valve chamber 16a becomes difficult to maintain, the speed of the opening operation of the diaphragm valve 10 decreases.
For this reason, in the dust collector S ′ using such a diaphragm valve 10, there is a problem that the effect of dust removal decreases.

Therefore, in the conventional diaphragm valve 10, the hole diameter of the bleed hole is made as small as possible, the opening operation is speeded up, and the optimum number of holes and hole dimensions are set so that the pressures in the pressure air chamber 15a and the valve chamber 16a are balanced as soon as possible. It is derived and set by conducting experiments and the like.
However, both have the problem that the dimensions are not optimal and are inevitably biased in either direction.

In view of the problems of the conventional diaphragm valve and dust collector, the present invention sets the bleed hole in a closed state when the diaphragm valve is closed, and sets the bleed hole in an open state when the diaphragm valve is open. The diaphragm valve that speeds up the opening / closing operation of the diaphragm valve is disposed on the exhaust valve for releasing the back pressure applied to the diaphragm, thereby speeding up the opening / closing operation of the diaphragm valve . Objective.
In addition, the present invention uses the diaphragm valve for the pressure air supply valve provided to remove dust adhering to the outer surface of the filter, thereby increasing the impact force at the time of dust removal and removing the dust. A second object is to provide a dust collector capable of improving efficiency and reducing pressure air.

In order to achieve the first object, a diaphragm valve according to the present invention is a diaphragm valve provided with an exhaust valve for releasing a back pressure applied to the diaphragm, wherein the exhaust valve has a back applied to the diaphragm in which a bleed hole is formed. together so as to separate the valve body from the valve seat by removing the pressure, the displacement of the diaphragm, when the valve body is seated on the valve seat by a bleed hole in the closed state, the valve body is separated from the valve seat A diaphragm valve equipped with a bleed hole opening / closing means is used to open the bleed hole when the bleed hole is open.

In this case, the bleed hole is closed when the diaphragm comes into contact with the surface of the valve retainer disposed on the back surface of the diaphragm of the diaphragm valve used for the exhaust valve, and the bleed is caused by separating the diaphragm from the surface of the valve retainer. The hole can be opened.

Further, a sub-bleed hole that is always open can be formed in the diaphragm of the diaphragm valve used for the exhaust valve .

  In order to achieve the second object, the dust collector of the present invention includes any one of the diaphragm valves described above as a pressure air supply valve provided for removing dust attached to the outer surface of the filter of the dust collector. It is characterized by using.

According to the diaphragm valve of the present invention, when the diaphragm valve starts to open, the bleed hole is in the closed state, so that the valve element is quickly separated from the valve seat, and when the diaphragm valve starts to close, the bleed hole Since the diaphragm valve is in an open state, a diaphragm valve with a quick closing operation and excellent response performance can be used as an exhaust valve, so that the opening / closing operation of the diaphragm valve can be speeded up. Thereby, for example, in a so-called double diaphragm valve, the opening / closing operation can be further speeded up .

In addition, the bleed hole is closed when the diaphragm comes into contact with the surface of the valve retainer disposed on the back surface of the diaphragm of the diaphragm valve used for the exhaust valve, and the bleed hole is separated by separating the diaphragm from the surface of the valve retainer. By making it an open state, it is possible to provide a diaphragm valve having a quick opening / closing operation by simply changing the shape of the valve presser without preparing a member for closing the bleed hole as a bleed hole opening / closing means. .

In addition, when a sub-bleed hole that is always open is formed in the diaphragm of the diaphragm valve used for the exhaust valve, the diameter of the sub-bleed hole is made smaller than the diameter of the bleed hole that is opened and closed. Without slowing the opening operation, the closing operation can be further accelerated, and consumption of pressure air can be suppressed.
In addition, by providing a sub-bleed hole, when the diaphragm valve is in the closed state, the back pressure applied to the diaphragm is reduced due to leakage from the exhaust valve in a state where the bleed hole is completely closed. Can be prevented.

  Furthermore, according to the dust collector of the present invention, any one of the diaphragm valves described above is used as a pressure air supply valve provided for removing dust adhering to the outer surface of the filter of the dust collector. The valve opening speed is fast, the cleaning performance is excellent, the valve closing speed is also fast, the diaphragm is instantaneously returned to the closed position, the valve body is closed, the use of pressurized air is eliminated by low pressure loss, and energy is consumed. It is possible to provide a dust collector capable of energy saving operation with a reduced amount.

Da ear Fulham is a cross-sectional view of a closed state of the valve. It is sectional drawing of the valve opening state which shows the same diaphragm valve. It is an expanded sectional view which shows operation | movement of the same diaphragm valve, (a) is a valve closing state, (b) is a valve opening state, (c) shows the example which made the inclination angle of the contact surface smaller than the arrangement | positioning angle of a diaphragm. . Another example of the closing means is shown, wherein (a) shows that the bleed hole is closed by an opening / closing member attached to the valve body side of the diaphragm, and (b) shows that the bleed hole is closed. (C) shows that the bleed hole is closed by an opening / closing member attached in the pressurized air chamber, and (d) shows that the bleed hole is opened. It is a graph which shows the opening / closing speed | rate of a diaphragm valve, (a) shows the diaphragm valve of this example , (b) shows the conventional diaphragm valve. 1 shows an embodiment of a diaphragm valve of the present invention, in which (a) is an overall sectional view, and (b) is an enlarged sectional view of a diaphragm valve as an exhaust valve. It is sectional drawing of the dust collector which uses the same diaphragm valve. It is sectional drawing which shows the valve closing state of the conventional diaphragm valve. It is sectional drawing which shows the valve opening state of the same diaphragm valve. It is sectional drawing of the dust collector which uses the same diaphragm valve.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a diaphragm valve and a dust collector of the present invention will be described based on the drawings.

With reference to FIGS. 1 to 5, illustrating the principle of the diaphragm valve of the present invention.
The diaphragm valve 1 is configured such that the valve body 24 is separated from the valve seat 23 by releasing the back pressure applied to the diaphragm 13 in which the bleed hole B is formed, and the valve body 24 is displaced by the displacement of the diaphragm 13. A bleed hole opening / closing means is provided for closing the bleed hole B when sitting on the valve 23 and for opening the bleed hole B when the valve body 24 is separated from the valve seat 23.

In this example , the configuration of the diaphragm valve will be described using a so-called full-body type diaphragm valve shown in FIGS. 1 to 2, but is not limited to this, for example, as shown in FIG. It can also be set as a header tank attachment type diaphragm valve directly attached to the tank T.

  The means for opening and closing the bleed hole B is a mechanism for closing the bleed hole B when the valve body 24 is seated on the valve seat 23 and opening it when the valve body 24 is separated from the valve seat 23. 3, there is no particular limitation, but as shown in FIG. 3, when the valve body 24 is seated on the valve seat 23, the diaphragm 13 is placed on the surface of the valve presser 25 disposed on the back surface of the diaphragm 13. A structure in which the bleed hole B formed in the diaphragm 13 is brought into a closed state by contacting with each other is particularly suitable.

In this case, the inclination angle β of the contact surface 25a of the valve retainer 25 with the diaphragm 13 is α1 ≧ β with respect to the arrangement angle α1 of the diaphragm 13 when the valve body 24 is seated on the valve seat 23. When the valve body 24 is separated from the valve seat 23, the bleed hole B is opened by the displacement angle of the diaphragm 13 being displaced to α2 (α1> α2).
Further, as shown in FIG. 3C, the inclination angle β of the abutting surface 25a is made smaller than the arrangement angle α1 of the diaphragm 13 (however, larger than α2), whereby the valve body 24 becomes the valve seat. Even when the separation from 23 is started, the bleed hole B is not immediately closed, and the timing for opening the bleed hole B can be adjusted by the inclination angle β.

  As shown in FIGS. 4A to 4B, an opening / closing member 26 disposed on the valve body 24 side of the diaphragm 13 is used separately from the valve presser 25, or FIGS. 4C to 4D are used. As shown, the bleed hole B can be opened and closed by using an opening and closing member 27 disposed in the pressurized air chamber 15 a of the main body 15.

  As shown in FIGS. 1 to 4, the valve body 24 is configured separately from the valve retainer 25 and the diaphragm 13, and the valve body 24 may contact the valve seat 23 with the surface of the diaphragm 13 as a valve body. I do not care.

  Further, the diaphragm 13 can be formed with a normally open sub-bleed hole B ′, thereby further increasing the speed of the closing operation of the diaphragm valve 10 and reducing the amount of consumption of pressurized air to be supplied. be able to.

The sub-bleed hole B ′ can further increase the speed of the closing operation, but causes the opening operation to slow down. Therefore, the hole diameter is made smaller than the hole diameter of the bleed hole B.
When emphasizing the speed of the opening operation or when the diaphragm valve 1 is in the closed state, the back pressure applied to the diaphragm 13 may decrease due to leakage from the exhaust valve in a state where the bleed hole is completely closed. If it is not present, it is not necessary to form it.

  In the above configuration, when supplying gas from a gas supply source (not shown) connected to the intake port 21 to the outer port 22 side, the exhaust valve connected to the exhaust port 17 is opened and the exhaust port 17 is opened. Diaphragm 13 is pulled up by releasing the pressure in valve chamber 16a (back pressure applied to diaphragm 13).

  At this time, since the bleed hole B is closed by the contact surface 25a of the valve retainer 25, the pressure air on the pressure air chamber 15a side is not introduced into the valve chamber 16a via the bleed hole B, and the diaphragm 13 The pressure difference between the pressurized air chamber 15a and the valve chamber 16a at the moment when the back pressure is released is maintained, and the opening operation of the diaphragm valve 10 becomes extremely fast.

When the supply of gas from the intake port 21 side to the outer port 22 side is stopped, the exhaust valve connected to the exhaust port 17 is closed.
At this time, since the bleed hole B is in an open state, the pressure in the valve chamber 16a (back pressure applied to the diaphragm 13) instantaneously balances with the pressure in the pressure air chamber 15a, and the valve body 24 is applied by the urging force of the spring 14. Can be pushed down to bring the diaphragm valve 1 into a closed state.

The graph of FIG. 5 shows the relationship between the valve opening / closing time of the diaphragm valve 1 of this example and the conventional diaphragm valve 10 and the pressure of the outer port 22.
As shown in FIG. 5 (a), in the diaphragm valve 1 of this example , the outer port is opened after the exhaust valve is opened, the valve opening time T1 when the pressure on the outer port 22 side becomes the maximum pressure P, and the exhaust valve is closed. Both the valve closing time T2 when the pressure on the 22 side becomes atmospheric pressure is the valve opening time when the pressure on the outer port side becomes the maximum pressure P ′ after the exhaust valve of the conventional diaphragm valve 10 shown in FIG. 5B is opened. After the time T1 ′ and the exhaust valve was closed, the pressure on the outer port 22 side became about 1/3 of the valve closing time T2 ′ at which the pressure became atmospheric pressure.
Further, by reducing the valve opening time T1, the maximum pressure P rises compared to the maximum pressure P ′ of the conventional diaphragm valve 10, and in particular, to remove dust adhering to the outer surface of the filter of the dust collector. The effect of paying off when used as a valve for supplying pressurized air provided in the case will be improved.

FIG. 6 shows an embodiment of the diaphragm valve of the present invention.

The diaphragm valve 1a, as shown in FIG. 6, the exhaust valve arranged to pull the back pressure applied to the diaphragm 13, so as to use a diaphragm valve 30 having a similar structure as the diaphragm valve according to the above example I have to.

  The diaphragm valve 30 used as the exhaust valve is configured to separate the valve body 32 from the valve seat 33 by releasing the back pressure applied to the diaphragm 31 in which the bleed hole B is formed, like the diaphragm valve 1. When the valve body 32 is seated on the valve seat 33, the bleed hole B is closed, and when the valve body 32 is separated from the valve seat 33, the bleed hole B is closed by the displacement of the diaphragm 31. Means are provided.

When the back pressure valve for releasing the back pressure applied to the diaphragm valve 1a is the diaphragm valve 30, the diaphragm valve 30 is smaller than the main diaphragm valve 1a. (b), the shows an example where the surface of the diaphragm 31 is configured to function as a valve body, as in the above example, may be provided a valve body separate.

  The means for opening and closing the bleed hole B is the same as that of the main diaphragm valve 1a, as shown in FIG. 6 (b), when the valve body 32 is seated on the valve seat 33, on the back surface of the diaphragm 31. A structure in which the bleed hole B formed in the diaphragm 31 is closed by bringing the diaphragm 31 into contact with the surface of the provided valve retainer 34 is particularly suitable.

  Thereby, the opening / closing speed of the diaphragm valve 1a can be further improved.

  FIG. 7 shows an embodiment of the dust collector of the present invention.

The dust collector S is the pressure valve for the air supply which is provided to shake off dust adhering to the outer surface of the dust collector filter 7, which was using a diaphragm valve according to the actual施例, its basic structure 10 is the same as the conventional dust collector S ′ shown in FIG. 10, and the outer port 22 of the diaphragm valve 1 is attached via a connecting pipe 8a disposed at the opening end of the cleaning air supply pipe 8 of the dust collector S, and the intake port By attaching 21 via the pressure air supply pipe 9 and the connecting pipe 9a, the pressure air supply pipe 9 and the cleaning air supply pipe 8 are intermittently communicated.

  Moreover, the header tank T can be used as the pressure air supply source of the dust collector S, and a header tank-mounted diaphragm valve can also be used.

Here, when the diaphragm valve 1a of the above embodiment is used, the diaphragm valve 30 is used as an exhaust valve for releasing the pressure of the valve chamber 16a, and the exhaust valve 18 is an exhaust valve for releasing the pressure of the diaphragm valve 30.

In the above configuration, the air containing dust from the dust generation source is normally guided to the dust-containing air introduction chamber 4 by the suction force of the suction device F connected to the downstream side of the purified air chamber 5 of the housing 2, and the dust. Is filtered by the filter 7, and the purified air is discharged through the purified air chamber 5.
Next, when dust adheres to the outer surface of the filter 7 and the ventilation resistance reaches a predetermined value, or after a predetermined time has elapsed, the exhaust valve 18 is opened to periodically open the valve chamber 16a. The pressure is released and the diaphragm valve 1 is opened.

At this time, since the bleed hole B of the diaphragm valve 1 is closed by the contact surface 25a of the valve retainer 25, the pressure air on the pressure air chamber 15a side is not introduced into the valve chamber 16a via the bleed hole B. The pressure difference between the pressure air chamber 15a and the valve chamber 16a at the moment when the back pressure applied to the diaphragm 13 is released is maintained, and the opening operation of the diaphragm valve 1 is extremely fast, and the pressure air in the pressure air supply pipe 9 is instantly washed air. It can flow out to the supply pipe 8.
Then, cleaning air is jetted into the filter 7 from the pressure air jet nozzle 6 disposed in the cleaning air supply pipe 8, and dust adhering to the outer surface of the filter 7 is removed.

Next, after a predetermined time (time T3 shown in FIG. 5) has elapsed, the exhaust valve 18 connected to the exhaust port 17 is closed.
At this time, since the bleed hole B of the diaphragm valve 1 is closed, the pressure in the valve chamber 16a (back pressure applied to the diaphragm 13) instantaneously balances with the pressure in the pressure air chamber 15a, and the action of the spring 14 The valve body 24 can be pushed down, the diaphragm valve 1 can be closed, and the pressure air supplied can be reduced significantly.

While the diaphragm valve and dust collector of the present invention have been described based on the example of its, the present invention is not limited to the configuration described in the above embodiments, as applicable, its construction without departing from the scope and spirit thereof Can be changed.

The diaphragm valve of the present invention has a characteristic that the bleed hole can be closed when the diaphragm valve is closed, and the bleed hole can be closed when the diaphragm valve is open. from closing not only the opening operation of the diaphragm valve also be used fast diaphragm valve to the exhaust valve, the speed of opening and closing operation of the diaphragm valve can FIG Rukoto, particularly, adhering to the outer surface of the dust collector filter dust It can be suitably used for a use of a valve for supplying pressurized air provided to remove the air.

DESCRIPTION OF SYMBOLS 1 Diaphragm valve 1a Diaphragm valve 13 Diaphragm 23 Valve seat 24 Valve body 25 Valve press 30 Diaphragm valve
31 diaphragm
32 discs
33 Valve seat B Bleed hole B 'Sub bleed hole S Dust collector

Claims (5)

  In a diaphragm valve in which the valve body is separated from the valve seat by releasing the back pressure applied to the diaphragm in which the bleed hole is formed, the bleed hole is closed when the valve body is seated on the valve seat due to the displacement of the diaphragm. A diaphragm valve comprising: a bleed hole opening / closing means for opening the bleed hole when the valve body is separated from the valve seat.   The bleed hole is closed when the diaphragm abuts on the surface of the valve retainer disposed on the back of the diaphragm, and the bleed hole is opened when the diaphragm is separated from the surface of the valve retainer. The diaphragm valve according to claim 1.   3. The diaphragm valve according to claim 1, wherein a sub-bleed hole that is normally open is formed in the diaphragm.   A diaphragm valve according to any one of claims 1 to 3, wherein the diaphragm valve is used to exhaust a back pressure applied to the diaphragm.   5. A dust collector, wherein the diaphragm valve according to claim 1, 2, 3, or 4 is used as a pressure air supply valve provided to remove dust attached to an outer surface of a filter of the dust collector.

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