JPS63172069A - Opening/closing valve structure - Google Patents

Abstract

PURPOSE:To keep a feed port and a discharge port in a completely sealed condition and increase the function of a valve by swelling a bag type elastic film body in a valve chamber by means of a high pressure operating liquid and bringing said film body into close contact with the inner face of said valve chamber, in a closing valve provided in a handling device for a high pressure liquid containing solid fine particles. CONSTITUTION:The operation of a piston 22 transmits the pressure of a sealed oil 23 to an elastic film body 11' via a supporting body 20 and the elastic film body 11' which is swelled out is brought into close contact with the inner face of a valve chamber 6', closing a feed port 7' and a discharge port 8'. And, a stopper 15 which is being advanced to the discharge port 8' by means of an advancing/retracting device is brought into contact with the elastic film body 11', without allowing its pressure to escape. Accordingly, the biting or clogging phenomenon of solid fine particles in a slurry 30 does not take place, while a biting or a breaking phenomenon does not take place either on the peripheral edge parts of the feed port 7' and the discharge port 8'. In particular, it does not take place that the pressure of the elastic film body 11' escapes to the discharge port 8' even if a high pressure at the time of the start up of a pressure feed device for the following process is applied to the feed port 7'.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology belongs to the field of structural technology for on-off valves during high-pressure transportation of factory waste slurry and the like in processing plants.

<Summary of the gist> The invention of this application is an on-off valve that is installed in the middle of a slurry transportation pipe from a previous stage process to a next stage process, and which connects a supply port connected to the previous stage to the next stage. An opening/closing valve in which a valve body that opens and closes one or both of the supply port and the discharge port is provided in a valve housing having a discharge port, and is connected to an actuator such as a liquid cylinder for opening and closing operation. This invention relates to a structure, and in particular, it is an invention that seals a working fluid such as oil between a bag-shaped elastic film made of rubber or the like that constitutes a valve body provided in a valve housing and a fluid cylinder such as an oil cylinder that constitutes an actuator. This invention relates to an on-off valve structure for controlling high-pressure slurry, etc., which opens and closes one or both of a supply port and a discharge port.

<Prior Art> As is well known, in many plants, piping for processing fluids, especially liquids, is used, and the piping has a flow rate of liquid based on the head difference between the previous stage and the next stage. Open/close valves are often used to turn on and off.

However, although the installation conditions for nuclide on-off valves in low-pressure piping are relatively relaxed, on-off valves in high-pressure piping are subject to strict conditions regarding the design of their seals and valve bodies.

Unlike the on-off valves used in normal liquid processing, the on-off valves connected to the pressure-feeding equipment used in the piping for transporting slurry such as factory waste to high-pressure filter presses, etc., are different from the on-off valves used in normal liquid processing. The problem is that sealing the valve body to the outlet is extremely difficult.

That is, the on-off valve installed in a normal high-pressure slurry piping etc. has a basic form as shown in FIG. It is interposed in a high-pressure pipe 5 connected to the pressure feeding device 4, and is moved forward and backward by an actuator 10 having a motor 9 between the supply lower connected at the front stage of the valve housing 6 and the discharge port 8 connected at the rear stage. For example, the valve body 11 is moved from a closed state close to the seat 12 of the supply lower to a retracted and opened state, and the high-pressure slurry from the slurry tank 2 is supplied from the supply lower to the pressure feeding device 4 through the discharge port 8. In addition, a mode is adopted in which the switching operation is performed so that the supply is stopped in the closed state.

<Problems to be Solved by the Invention> However, in the on-off valve 1 of the conventional nuclide mode, both the supply lower seat 12 of the valve housing 6 and the valve body 11 are rigid bodies made of metal, especially high-pressure Many slurries take this form, and therefore,
If the seal between the valve body 11 and the seat 12 is not extremely accurate, a leak will occur immediately and the valve will not be able to function as the opening/closing valve 1, leading to the risk of the valve popping.

However, since the processing liquid is a high-pressure slurry,
Firstly, even if a slight clearance is formed between the seat 12 and the valve body 11 due to the entanglement or clogging of mixed solid particles, there is a drawback that it will immediately lead to a malfunction. There is a problem in that plant operation is stopped for periodic maintenance and maintenance, which reduces operational efficiency. There were problems in that damage due to the entrapment of fine particles and the formation of minute clearances were unavoidable.

In addition, the frequently repeated contact and separation of the valve body 11 with the seat 12 inevitably causes solid particles to be caught in the valve body 11, the seat 12, or both. This has the disadvantage that hard metal is required, which increases the cost, and the finishing process is also expensive.

<Object of the Invention> The object of the invention of this application is to solve the problems of the on-off valve based on the above-mentioned prior art, especially the on-off valve installed in a processing plant for processing high-pressure liquids containing solid particles such as high-pressure slurry. As a technical issue, it is possible to open and close at least one of the supply port and the discharge port in the valve housing of the on-off valve in a completely sealed state, and to keep the initial cost and running cost low, and to create a groove structure. Application field of fluid treatment technology in various industries by making it relatively simple, robust, and has good operating efficiency, good durability, good response characteristics, and no functional deterioration due to solid particulate encroachment etc. The purpose is to provide an excellent on-off valve @ structure that will benefit the customers.

<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of the invention of this application, which is based on the above-mentioned claims, is to provide a filter press for slurry, etc. from a slurry tank. A hydraulic cylinder attached to the valve housing of the on-off valve is used to start and stop the supply of the liquid to be processed under high pressure by a high-pressure pump to the next stage of processing using an on-off valve installed in an intermediate high-pressure pipe. A working liquid such as oil is sealed between a liquid cylinder such as the above and a bag-like elastic film body made of rubber or the like provided in the valve housing, and the liquid cylinder is in a retracted position and the elastic film body in the valve housing is connected to the valve housing. It is supported in a contracted position by a porous body such as a net fixed to the housing, and liquid such as high-pressure slurry from the supply port is sent under high pressure to the next stage of processing via the discharge port, and when the pumping is stopped, the liquid cylinder By stretching the elastic membrane, the elastic membrane inside the valve housing swells through the working liquid interposed between the elastic membrane and the valve housing to tightly contact the inner surface of the valve housing and completely close the supply port and the discharge port. Close one of the supply and discharge ports, or
Stoppers attached to both sides are supported by advancing/retracting devices to prevent pressure build-up, or a porous body such as a net provided at either or both of the supply port and the discharge port The elastic membrane body maintains the sealed state of one or both of the supply port and the discharge port, and furthermore, the elastic film body is formed for the supply port and/or the discharge port, or both of the supply port and the discharge port. The seal body, such as a taper cone shape, closes the corresponding supply port and discharge port to reliably prevent leakage of high pressure fluid, and
The elastic membrane hermetically isolates and seals the liquid remaining on the inner surface of the valve housing during the closing process, and the large area of the elastic membrane ensures that the sealing pressure is maintained at a high level. Technical measures have been taken to ensure that solid fine particles mixed in the high-pressure liquid will never get caught in the machine part, and will never cause damage or wear due to such biting.

<Embodiments - Configuration> Next, embodiments of the invention of this application will be described below based on FIGS. 1 to 4. Incidentally, parts having the same features as those in FIG. 5 will be explained using the same reference numerals.

In the embodiment shown in FIG. 1.2, 1' is an opening/closing valve that forms the center of the gist of the invention of this application. This is an embodiment in which slurry is fed under high pressure by a pumping device 4, and the slurry is interposed in the piping 5.

The valve housing 6' of the opening/closing valve 1' is formed into a substantially spherical shape, and supply lowers' connected to the pressure feeding device 4 at the previous stage are formed at positions 90 degrees apart from each other, and
On the other side, a discharge port 8' is formed and connected to a cylinder 13, and the cylinder 13 has a supply port 14 and is connected via a pipe 5 to a filter press 3 for the next stage of processing.

Further, a disk-shaped stopper 15 having a minute clearance with the cylinder 13 is provided in the cylinder 13, and a suitable stopper (not shown) is provided through a rod 16 so as to move forward and backward between the rear part of the supply port 14 and the discharge port 8'. A bellows 18 made of rubber is connected to the advance/retract actuating device, and a rubber bellows 18 is fixed between the stopper 15 and the rear i17 of the cylinder 13 under a seal to prevent slurry from entering the seal between the rod 16 and the rear cover 17. It is designed to allow smooth stroke operation without maintenance.

A collar 19 is integrally fixed to a portion of the valve housing 6' opposite to the supply lower part, and the base of a bag-like elastic membrane 11' made of rubber is attached to the neck portion of the collar 19. It is integrally fastened together with a bottomed cylindrical support body 20 made of wire mesh in the state of the minimum posture.

The elastic membrane body 11' contacts the support body 20 from the outside when it is contracted, and when it is expanded, it comes into close contact with the inner surface of the valve housing 6', as shown by the dashed line, and also connects the supply lower' and the exhaust gas. The outlet 8' is kept in a hermetically closed state, and the outlet 8' is supported by a stopper 15 by an advance/retreat device that moves forward at that timing to prevent pressure from escaping.

Further, the collar 19 is provided with a hydraulic cylinder 10' as a liquid cylinder, and oil 23 as a working fluid is disposed between a piston 22 provided in a casing 21 of the hydraulic cylinder 10' so as to be movable back and forth and an elastic membrane 11'. A worm 26 meshes with a rack gear 25 formed on the rod 24 of the piston 22 and is connected to a reducer 27 via the gear 26.
The piston 22 is moved forward and backward by transmitting the power from the motor 28, thereby making the elastic membrane 11' expandable and contractible via the oil 23.

Although not shown, the forward/backward movement device connected to the rod 16 of the stopper 15 and the motor 28 are electrically connected via a control device (not shown) so as to be interlocked with each other. At times, the stopper 15 is arranged to advance into the outlet 8'.

<Embodiment - Effect> In the above configuration, the slurry 30 from the slurry tank 2
When the pumping device 4 pumps the filter press 3 in a predetermined amount at a high pressure, the solid line shown in the figure shows the supply lower ',
Then, in order to keep the discharge port 8' open, the slurry 30 is forced to the filter press 3 through the piping 5 and the on-off valve 1' by the operation of the pumping device 4.

When a predetermined amount of slurry 30 is supplied to the filter press 3, the pressure feeding device 4 is stopped, but at the same time, the supply lower' of the on-off valve 1' is closed, and at this time, the motor 29 is operated to reduce the speed [ 28, gear 27, and worm 26, the rod 24 advances through engagement with the rack 25, and the piston 22' advances through the casing 21. Therefore,
The sealed oil 23 transmits its pressure to the elastic membrane 11' via the support 20, and the elastic membrane 11' bulges out and comes into close contact with the inner surface of the valve housing 6', as well as the supply lower' and exhaust gas. The outlet 8' is also closed.

In this state, when the motor 29 starts operating, an unillustrated advancing/retracting device operates to move the stopper 15 forward via the rod 16 and reach the position of the discharge port 8', so that the bulging elastic membrane 11' A stopper 15 is installed at the discharge port 8'.
comes into contact with.

Therefore, the pressure of the elastic membrane 11' is temporarily transferred to the discharge port 8' side. In particular, even if high pressure acts on the supply lower ' at the next start-up of the pumping device 4, the pressure cannot be handled, and when slurry pumping is resumed. The motor 29 and the advancing/retracting actuator are activated to contract the elastic membrane 11', opening the supply lower' and the discharge port 8', and the high-pressure slurry is immediately transferred to the supply lower'.
From there, it passes through the discharge port 8' and is fed to the filter press 3 via the piping 5.

For example, when the slurry 30 remains between the elastic membrane 11' and the valve housing 6' as shown in FIG. Even if the slurry 3 is
Solid fine particles inside Q do not get stuck or become clogged,
The sealed state is reliably maintained, and damage such as cracks to the elastic membrane 11' does not occur.

In this case, even if the high pressure of the pressure feeding device 4 is acting on the pipe 5, a balanced high pressure commensurate with the high pressure is acting on the oil 23 of the hydraulic cylinder 10', so that the sealed position is ensured. maintained.

In the embodiment shown in FIG. 3, the supply lower' of the elastic membrane body 11' or the discharge port 8', and furthermore, the Taber cone-shaped seal body for both of them is fixed by vulcanization. According to this aspect, the supply lower ′ and the discharge port 8′ can be more reliably closed, and the periphery thereof can be sealed with the elastic membrane 11′.

In addition, the embodiment shown in FIG.
', or both of them can be provided with a sufficiently strong porous body 32 such as a center steel plate to maintain and support the elastic membrane body 11' in the closed position; in this case, It acts as a kind of stopper in the expansion process of the elastic membrane, and prevents pressure from escaping.

In this way, even if the supply lower ' and the discharge port 8' of the opening/closing valve 1' are opened and closed by the elastic membrane 11', the elastic membrane 11' will not be damaged by the solid fine particles of the slurry. Furthermore, no jamming or breakage phenomenon occurs at the peripheral edges of the supply lower' and the discharge port 8'.

It should be noted that the embodiments of the invention of this application are of course not limited to the above-mentioned embodiments, and various embodiments may be adopted, such as using a disk-shaped seal member or a rod-shaped support member. It's possible.

Furthermore, in terms of design changes, it is of course possible to design the valve housing not only in a spherical shape but also in a rectangular or drum shape due to the movability and elasticity of the elastic membrane.

It goes without saying that the applicable plant is not only a filter press, but also various forms such as extinguishing and drying in the next stage of processing.

<Effects of the Invention> As described above, according to the invention of this application, basically, in the on-off valve installed in the piping for conveying untreated liquid containing solid particles such as slurry under high pressure to the next stage treatment such as a filter press, Because the valve body is made of an elastic membrane, there are no moving metal parts, and it adapts to the shape of the supply and discharge ports to reliably close them in the inflated position, and to open them when contracted. In addition, solid particles of the slurry do not get caught, and therefore, there is no cracking or damage to the device or the elastic membrane, and it is highly durable and always provides a reliable seal in the closed state. It has the excellent effect of being able to retain the

In addition, since the internal pressure is increased in the expanded position of the elastic membrane, the pressing force against the inner surface of the valve housing is large and a reliable seal can be maintained. This has the effect of preventing pressure from escaping, and also has the excellent effect of making the seal more reliable.

Moreover, even if there is slurry remaining between the supply port and the discharge port when switching between opening and closing, this is captured between the inner surface of the valve housing and the elastic membrane, and is trapped in the high pressure state of the elastic membrane. , there is also an effect that no sealing failure occurs.

In addition, by providing a tapered cone-shaped sealing body for the supply port or the discharge port on the elastic membrane body, the sealing performance in the closed state is even better, and a double sealing effect is achieved by the sealing of the elastic membrane body. There are advantages to be gained.

Furthermore, by having a stopper linked to the advancing/retracting device and waiting at one or both of the supply port and the discharge port when the elastic membrane body is in the bulging position, the pressure does not escape, and the elastic membrane body is protected from unexpected damage. There is also the advantage that even if excessive pressure is applied, the elastic membrane body can be prevented from protruding toward the supply port and the discharge port.

Furthermore, since the working fluid such as oil is sealed between the liquid cylinder and the elastic membrane, the device does not require maintenance and maintenance over a long period of time, and the device structure is simple. Maintenance costs can be easily reduced, reliable operation can be achieved, and not only initial costs but also maintenance costs can be kept low, which is an excellent effect.

In addition, there are no cracks in the elastic membrane, and the valve housing is less likely to be damaged or have leakage scratches, so there is an advantage that maintenance and inspection can be done less frequently and the plant can be operated more efficiently.

[Brief explanation of the drawing]

1 to 4 are detailed explanatory views of the invention of this application, in which FIG. 1 is a schematic sectional side view of one embodiment, FIG. 2 is an enlarged sectional view of the same part in an operating state, and FIG. 3 is another embodiment. FIG. 4 is a partially enlarged sectional view of the example, FIG. 4 is a partial sectional view of yet another embodiment, and FIG. 5 is a schematic sectional side view of an on-off valve based on the prior art.

Claims (10)

[Claims] (1) In an opening/closing valve structure in which a valve housing having a supply port and a discharge port is provided with a valve body that opens and closes at least one of the supply port and the discharge port and is connected to an actuator, the valve body is disposed within the valve housing. An opening/closing valve structure characterized in that a liquid is sealed between a bag-shaped elastic membrane forming a valve body and a liquid cylinder attached to the valve housing. (2) In an opening/closing valve structure in which a valve housing having a supply port and a discharge port is provided with a valve body that opens and closes at least one of the supply port and discharge port and is connected to an actuator, the valve body is disposed within the valve housing. A liquid is sealed between a bag-shaped elastic membrane forming the valve body and a liquid cylinder attached to the valve housing, and a support provided inside the elastic membrane is fixed to the valve housing. Open/close valve structure. (3) The opening/closing valve structure according to claim 2, wherein the support body is formed of a porous body that resembles the contracted position of the elastic support body. (4) The opening/closing valve structure according to claim 2, wherein the support body is formed of a rod. (5) In an opening/closing valve structure in which a valve housing having a supply port and a discharge port is provided with a valve body for opening and closing at least one of the supply port and the discharge port and connected to an actuator, the valve body is disposed within the valve housing. A liquid is sealed between a bag-shaped elastic membrane forming the valve body and a liquid cylinder attached to the valve housing, a stopper is formed for the discharge port, and the valve housing is connected to an advancing/retracting device. Open/close valve structure. (6) The opening/closing valve structure according to claim 5, wherein the stopper is a disk connected to an advancing/retracting device. (7) In an opening/closing valve structure in which a valve housing having a supply port and a discharge port is provided with a valve body for opening and closing at least one of the supply port and the discharge port and connected to an actuator, the valve body is disposed within the valve housing. A liquid is sealed between a bag-shaped elastic membrane forming the valve body and a liquid cylinder attached to the valve housing, and a porous body is fixed to at least one of the discharge port and the supply port. Open/close valve structure. (8) In an opening/closing valve structure in which a valve housing having a supply port and a discharge port is provided with a valve body for opening and closing at least one of the supply port and the discharge port and connected to an actuator, the valve body is disposed within the valve housing. A liquid is sealed between a bag-shaped elastic membrane forming the valve body and a liquid cylinder attached to the valve housing, and a sealing body for at least one of the supply port and the discharge port is integrally formed on the outer surface of the elastic membrane. An on-off valve structure characterized by being attached. (9) The opening/closing valve structure according to claim 8, wherein the seal body is formed into a disk shape. (10) The opening/closing valve structure according to claim 8, wherein the seal body is formed in a tapered cone shape.