JP2012247056A - Diaphragm valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve body structure having less flow channel loss, in a pulse jet valve used for a dust removal device of a bag filter.SOLUTION: In the pilot-type diaphragm valve which is controlled by an electromagnetic valve 22, a guiding member 24 is projected at the downstream side leading end of a valve body 26 in order to straighten the flow to be controlled when the valve body 26 is opened to prevent the flow to be controlled from colliding with each other.

Description

  The present invention relates to a diaphragm valve of a dust collector equipped with a bag-jet pulse jet type wipe-out mechanism.

  2. Description of the Related Art Conventionally, a dust collector using a bag filter has been used as a processing apparatus for exhaust gas containing dust or dust generated from various factories such as an incineration facility, a coke oven, and a powder factory.

  A pulse air type wiping mechanism is employed as a method for instantaneously injecting compressed air onto the bag filter in the direction opposite to the air flow at the time of dust collection, and wiping off the dust adhered to and deposited on the bag filter.

  Therefore, the pulse air type flushing mechanism switches the valve seat 32 of the conduit 31 between the valve closed state (FIG. 4) and the valve open state (FIG. 5) by the displacement of the diaphragm 30, and a compressed air tank (not shown). The header pipe 33 and the conduit 31 communicating with each other are intermittently communicated so that the dust adhering to the outer surface of the bag filter is removed by the compressed air ejected from the pulse injection nozzle disposed in the conduit 31.

  However, in the conventional structure, the diaphragm 30 is displaced upward or downward so as to be separated or brought into contact with the valve seat 32 of the conduit 31 to switch from the valve closed state to the valve open state. When displaced upward, the compressed air of the header pipe 33 flows toward the conduit 31. When the valve body 34 of the diaphragm 30 is flat, the compressed air hits the plane of the valve body 34 and turbulent there. When the compressed air flows from the header pipe 33 into the conduit 31, the flow does not become smooth and large intrusion occurs, the pressure loss due to the airflow at that portion increases, and the compressed air supply amount decreases, For this reason, there is a problem that a larger compressed air tank is required, leading to an extra cost increase.

  In particular, in the case of a large dust collector using a bag filter with a wide filtration area, if the compressed air of the backwash airflow is not increased significantly, the collected dust will not be sufficiently discharged, leading to an increase in pressure loss in a short period of time. The problem was seen. In order to prevent this, the operation is carried out by increasing the compressed air. For this reason, a larger amount of compressed air is generated, so that a powerful compressor is required and there is a concern about a large energy loss in the operation.

Problems to be solved by the invention

  Accordingly, the present invention is intended to solve the above-mentioned problems. First, the object of the present invention is to compress the air flowing into the bag filter without increasing the air pressure of the compressed air blown from the pulse injection nozzle. The amount of air can be increased, and the effect of removing dust collected by the bag filter can be sufficiently obtained.

  The next object of the present invention is to allow the compressed air to flow smoothly without increasing the pressure loss when compressed air flows from the header pipe into the conduit.

  The next object of the present invention is to make it possible to sufficiently remove the dust collected by the bag filter without increasing the amount of compressed air, thereby contributing to energy saving and cost reduction.

Means for solving the problem

  The solution of the present invention includes a main diaphragm assembly member attached so as to close an opening of a header pipe communicating with a compressor in the valve body, a main diaphragm chamber formed by the valve body and the main diaphragm assembly member, A groove communicating with the main diaphragm chamber formed in the valve body and an exhaust hole communicating with the atmosphere, a cap fixed to the valve body, a pilot diaphragm chamber formed in the cap, and a pilot diaphragm assembly member provided in the pilot diaphragm chamber; It consists of a coil spring mounted in the main diaphragm chamber and the pilot diaphragm chamber, an electromagnetic valve mounted in the pilot diaphragm chamber, and a conduit having a valve seat at one end. In particular, a sleeve-shaped guide member is attached to the main diaphragm assembly member. Is that bamboo Installing to.

  Here, as a method of integrally attaching the sleeve-shaped guide member to the main diaphragm assembly member, a screwing method, a press-fitting method, a bonding method, or the like is possible.

  The effect | action by the said problem-solving means is as follows. When the compressed air is blown from the diaphragm valve, first, when the solenoid valve is energized, the fluid in the pilot diaphragm chamber flows out to the atmosphere through the solenoid valve. Therefore, the pressure in the pilot diaphragm chamber is atmospheric pressure. At this moment, the pressure in the pilot diaphragm chamber becomes lower than the pressure in the main diaphragm chamber, and the pilot diaphragm assembly member is lifted by this pressure difference, so that the fluid in the main diaphragm chamber flows from the exhaust hole to the atmosphere. At this time, the pressure in the main diaphragm chamber becomes lower than the pressure in the header pipe, and this pressure difference causes the sleeve-shaped guide member to float together with the main diaphragm assembly member, so that the valve seat is opened. Therefore, the compressed air can be blown out from the diaphragm valve.

  Next, when stopping the blowing of compressed air, when energization of the solenoid valve is stopped, compressed air is supplied through the conduction hole (bleed hole) into the pilot diaphragm chamber, and the pilot diaphragm assembly member descends due to the restoring force of the coil spring. Closed. Furthermore, since the header pipe side pressure is replenished into the main diaphragm chamber and becomes the same pressure, the main diaphragm assembly member descends and closes the valve seat due to the pressure in the main diaphragm chamber and the restoring force of the coil spring, so compression from the diaphragm valve Air blowing stops.

Effect of the invention

The diaphragm valve of the present invention has the following effects.
(1) Even if the air pressure of the compressed air is not increased, the amount of air that blows out the compressed air from the diaphragm valve can be increased, and the effect of removing dust collected by the bag filter can be sufficiently obtained.
(2) Since the sleeve-shaped guide member is integrally attached to the main diaphragm assembly member, when the compressed air flows from the header pipe into the conduit, the pressure flows smoothly without increasing.
(3) Since the flow characteristics such as reduction of inflow resistance are improved, the compressed air pressure can be lowered. Therefore, the power of the compressor can be reduced, energy saving effect can be exhibited, and cost reduction can be achieved.

Schematic which shows the valve closing state of the diaphragm valve of this invention. Schematic which shows the valve opening state of the diaphragm valve of this invention. Schematic cross-sectional view of a dust collector using a diaphragm valve. Schematic which shows the valve closing state of the conventional diaphragm valve. Schematic which shows the valve opening state of the conventional diaphragm valve.

  In general, as shown in FIG. 3, the dust collector 1 includes a dust collecting chamber 4 having a lower hopper 2 and a bag filter 3, a clean chamber 5 provided with a dust removing mechanism, and a dust collecting chamber 4 that contains dust or dust. It is comprised from the gas inlet 6 introduce | transduced into this.

  The exhaust gas containing dust or dust enters the dust collection chamber 4 by pressure feeding or suction, and the dust adheres to and accumulates on the outer surface of the bag filter 3, and the filtered air is provided in the clean chamber 5 through the bag filter inner surface. Exhaust air is exhausted from the exhaust port 7 as clean air. And the dust adhering to the surface of the bag filter 3 is wiped off at regular intervals by a pulse jet type dropping mechanism described later, and dropped to the lower hopper 2.

  The pulse jet type wipe-out mechanism is composed of a valve body 8 and a pulse injection nozzle 10 disposed in a conduit 9 constituting the valve body 8.

Next, the valve body 8 will be described with reference to FIGS.
The valve body 8 includes a main diaphragm assembly member 13 attached to the valve case 11 so as to close an opening of a header pipe 12 communicating with the compressor, and a main diaphragm chamber 14 formed by the valve case 11 and the main diaphragm assembly member 13. A groove 15 communicating with the main diaphragm chamber 14 formed in the valve case 11 and an exhaust hole 16 communicating with the atmosphere, a cap 17 fixed to the valve case 11, a pilot diaphragm chamber 18 formed in the cap 17, and a pilot diaphragm A pilot diaphragm assembly member 19 provided in the chamber 18, coil springs 20 and 21 mounted in the main diaphragm chamber 14 and the pilot diaphragm chamber 18, respectively, an electromagnetic valve 22 mounted in the pilot diaphragm chamber 18, and one end It consists conduit 9 for forming the valve seat 23, in particular those bamboo Attach the guide member 24 of the sleeve-shaped integral with the main diaphragm assembly member 13.

  The main diaphragm assembly member 13 includes a diaphragm 25 pressed and locked between the valve case 11 and the header pipe 12, a valve body 26 fixed to the lower part of the diaphragm 25, and a stopper 27 fixed to the upper part of the diaphragm 25. It is configured. A coil spring 20 is mounted between the inside of the valve case 11 and the abutment tool 27 so that the opening of the header pipe 12 is always closed with a diaphragm 25.

  Because of such a structure, air containing dust is normally guided to the gas inlet 6 by a suction fan (not shown) connected to the downstream side of the clean chamber 5 of the dust collector 1 body, and the dust is bugged. The purified air filtered by the filter 3 is exhausted from the exhaust port 7 through the clean chamber 5 to the outside as clean air. At that time, when dust adheres to the outer surface of the bag filter 3 and the ventilation resistance reaches a predetermined value, or when a certain period of time elapses, the solenoid valve 22 is activated when the solenoid valve 22 is energized periodically. To do. For this reason, the fluid in the pilot diaphragm chamber 18 flows out to the atmosphere through the electromagnetic valve 22. At this moment, the pressure in the pilot diaphragm chamber 18 becomes lower than the pressure in the main diaphragm chamber 14, and this pressure difference causes the pilot diaphragm assembly member 19 to float, and the fluid in the main diaphragm chamber 14 flows from the exhaust hole 16 to the atmosphere. At this time, the pressure in the main diaphragm chamber 14 is lower than the pressure in the header pipe 12, and this pressure difference causes the sleeve-shaped guide member 24 to float together with the main diaphragm assembly member 13 to open the valve seat 23. The compressed air is blown out by being guided to the conduit 9 through the valve seat 23. The compressed air thus blown out blows cleaning air from the pulse injection nozzle 10 disposed in the conduit 9 to the inner surface of the bag filter 3, and dust that adheres to the outer surface of the bag filter 3 is removed.

  Next, when the dust removal of the bag filter 3 is completed, when the energization of the solenoid valve 20 is stopped, the pressure is supplied to the pilot diaphragm chamber 18 and the solenoid valve 22 is returned to the original position, and the coil spring 21 is moved. As a result of the pressing, the pilot diaphragm assembly member 19 is lowered and the inside of the pilot diaphragm chamber 18 is closed. In addition, since the header pipe 12 side pressure is replenished into the main diaphragm chamber 14 and becomes the same pressure, the main diaphragm assembly member 13 is lowered by the pressure in the main diaphragm chamber 14 and the restoring force of the coil spring 20, and the valve seat 23 is lowered. Since the closing, the blow-out of compressed air from the diaphragm valve 8 stops and the dust is removed.

  In this embodiment, one embodiment of the present invention has been described. The present invention is not limited to this embodiment, and the gist of the present invention is not changed at all by various modifications.

  By using the diaphragm valve of the present invention in a dust collector equipped with a pulse jet type blow-off mechanism, the amount of compressed air flowing into the bag filter can be increased without increasing the compressed air pressure. Thus, the effect of removing the collected dust of the bug filter can be obtained sufficiently, and it is practically very large.

DESCRIPTION OF SYMBOLS 1 ... Dust collector 2 ... Lower hopper 3 ... Bag filter 4 ... Dust collection room 5 ... Clean room 6 ... Gas introduction port 7 ... Exhaust port 8 ... Diaphragm Valve 9 ... Conduit empty 10 ... Pulse injection nozzle 11 ... Valve body 12 ... Header pipe 13 ... Main diaphragm assembly member 14 ... Main diaphragm chamber 15 ... Groove 16 ... Exhaust hole 17 ... Cap 18 ... Pilot diaphragm chamber 19 ... Pilot diaphragm assembly member 20, 21 ... Coil spring 22 ... Solenoid valve 23 ... Valve seat 24 ... Guide member 25 ..Diaphragm 26 ... Valve 27 ... Applicator

Claims (1)

A main diaphragm assembly member attached to close the opening of the header pipe communicating with the compressor, a main diaphragm chamber formed by the valve case and the main diaphragm assembly member, and a main diaphragm chamber formed in the valve body. Exhaust holes communicating with the groove and the atmosphere, a cap fixed to the valve body, a pilot diaphragm chamber formed in the cap, a pilot diaphragm assembly member provided in the pilot diaphragm chamber, and a main diaphragm chamber and a pilot diaphragm chamber, respectively. A die comprising a coil spring, a solenoid valve mounted in a pilot diaphragm chamber, and a conduit having a valve seat at one end, and a sleeve-shaped guide member integrally attached to a main diaphragm assembly member Furamubarubu.

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