JPH0758068B2 - Pumping device structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The disclosed technique is used when a liquid to be treated such as a slurry discharged from a factory or the like as a waste liquid is pressure-fed to a device such as a filter press in the next treatment step. It belongs to the technical field of the pumping device and structure used.

<Summary of Summary> Therefore, the invention of this application is such that a bulging flexible film made of rubber or the like is sandwiched at the end of a casing of a pumping device for pumping a liquid to be treated such as slurry. Provided inside the casing, the flexible membrane faces the suction / exhaust port and is divided into a feed chamber for sucking and discharging the liquid to be treated and a pressurizing chamber filled with the working liquid. The present invention relates to a pumping device structure in which a flexible membrane is directly pressurized through a hydraulic fluid such as oil and the liquid to be treated is once sucked into a feed chamber by expansion and contraction and is then post-extracted. Therefore, the cylinder is fixed to the casing inside the pressurizing chamber so as to extend inward, and the working fluid is sealed and filled with the casing, the cylinder, and the piston. Pressure is applied directly to the flexible membrane through the flow of hydraulic fluid to expand and contract At the same time, the present invention relates to a pressure-feeding device structure for preventing a liquid to be treated such as a slurry from entering the pressure applying device due to an unexpected crack of the flexible film.

<Prior Art> As is well known, when treating a slurry or the like discharged as a waste liquid from various manufacturing factories, a liquid press is squeezed to solidify the slurry, and a filter press or the like is used so that the slurry can be easily incinerated. The apparatus is widely used, and a pressure-feeding apparatus for pressure-feeding the slurry to a processing apparatus such as a filter press has been developed by the applicant, which also has a rubber bulging flexible membrane in its casing. As a result, a large-capacity pumping device in which the expansion / contraction amount of the flexible film is absorbed / exhausted is being used.

The rubber bulging flexible membrane is attached to the casing end of the pumping device by co-fastening the hem of the end of the casing, and is installed inside the casing. A chamber is defined, and a working fluid such as oil is directly pressed into the pressurizing chamber to expand and contract the flexible membrane, and the slurry to be treated which is provided at the side end of the casing and connected to the feeding chamber is treated. The slurry is sucked into and discharged from the casing following the expansion and contraction of the flexible membrane from the liquid inlet and outlet, and is fed under pressure to a processing device such as a filter press. The discharge is performed by a hydraulic fluid circulating device or a cylinder mechanism provided outside the casing.

In addition, a stroke detection device for controlling the expansion / contraction stroke of the flexible film when supplying / discharging the hydraulic fluid to / from the casing is necessary for determining the expansion / contraction switching timing, and many inventions proposed by the applicant have been made. According to the invention, a detection device for controlling the forward / backward stroke is provided by providing a rod projecting a base end portion outside the casing so that the rod is connected to the distal end portion of the flexible membrane and interlocked with the detection device such as a limit switch. Has been converted.

<Problems to be Solved by the Invention> However, although the above-described conventional pressure-feeding device provides the pressure-feeding function by uniformly applying a pressing force to the flexible membrane, the flexible member made of rubber inside the casing is used. When the membrane deteriorates during its operation, or when it is unexpectedly cracked due to rubbing of a solid substance to cause damage, the liquid to be treated such as slurry directly penetrates into the hydraulic fluid and There is a drawback in that the circulation path is contaminated, and it becomes unavoidable that it becomes unusable, and as a result, all the operations of the related equipment related to pumping are stopped and a great amount of time is spent on maintenance work.

In order to deal with this, for example, as disclosed in Japanese Utility Model Publication No. 58-34312, there is disclosed a technique in which a hydraulic fluid is interposed, but in a swelling type pressure feeding device, Since the volume occupied by the pressure chamber and the casing is large and the pressurizing capacity is large, it is necessary to avoid contamination as much as possible.

Also, the confirmation of cracks in the flexible film that expands and contracts in the casing is casing and, and because the flexible film is opaque and invisible from the outside, there is no means for directly detecting the cracks.
Since the method of indirect detection is used, it is extremely difficult to prevent such a situation that the liquid to be treated such as slurry easily enters the circulation path of the working fluid due to a mistake such as overlooking it stochastically. If there is a difficulty and if it is detected indirectly, the device can be stopped and used for maintenance such as flushing, but when the liquid to be treated such as slurry inadvertently enters the circulation path during the work There is a disadvantage that there are also.

<Object of the Invention> The object of the invention of this application is to solve the problem of maintenance of the pumping device based on the above-mentioned prior art, and the pumping device is used in a processing plant for slurries and the like. When pressure-feeding the liquid to be processed to the stage treatment device, as a countermeasure against unexpected occurrence of problems such as cracks in the rubber flexible membrane in normal use, treatment with minimal damage is performed as quickly as possible. In order to obtain the processing liquid such as slurry, it is possible to suppress the intrusion of the liquid to be treated locally to protect other operating pressure system devices, and to perform the treatment only by cleaning the local portion, improving the efficiency of the pressure feeding process. An object of the present invention is to provide an excellent pumping device structure that reduces the overall loss and is useful in the field of liquid treatment technology application in various industries.

<Means and Actions for Solving the Problem> In order to solve the above-mentioned problems, the structure of the invention of the present application, which is based on the above-mentioned object and has the scope of the above-mentioned claims, is made of a rubber expansion member A flexible film of a release type is installed with its skirt mounted, and the inside of the casing is divided by the flexible film into a treatment liquid supply chamber and a pressurization chamber for the working liquid. A cylinder is attached to the casing side plate, and the cylinder is communicated with the pressurizing chamber through a piston that advances and retreats to seal the working fluid between the cylinder and the piston. The intrusion of the liquid to be treated such as slurry into the pressurizing chamber due to the crack damage of the flexible film is performed in the sealing part formed of the rubber flexible film that may cause the crack, and the pressure of the working liquid is applied. The hydraulic fluid in the circulation path flows in through an intake / exhaust port provided in the casing side plate on the pressurizing chamber side, It is designed so that the cylinder is prevented from entering the circulation path of the working fluid such as sludge liquid such as slurry, while the electrode pair is installed so as to be communicated with the pressure chamber and immersed. The liquid to be treated, such as slurry, is mixed with the working liquid whose sealing state has been destroyed by the slurry detection device, and the current is applied, the intrusion is detected and damage such as cracks in the flexible film can be confirmed, and prompt measures are taken. It is a technical measure that is made possible.

<Embodiment> Next, one embodiment of the invention of this application will be described below with reference to the drawings.

Reference numeral 1 denotes a pumping device that forms the center of the gist of the invention of this application, and its casing 2 is a drum type with a bottom, and a flange 3 is provided at one end thereof, and is usually a bulging type rubber flexible film. The tip of 4 bulges into the casing 2, and the circular edge of the hem is fastened together with the flange 3.

The casing 2 is provided at its bottom with a feed inlet 5 and a discharge outlet 6 for slurry as a liquid to be treated, and the flexible curtain 4
A space on the bottom side of the casing 2 is formed in the slurry feed chamber 7.

Further, a cylinder 9 having a predetermined length is provided at an inner central portion of the casing 2 on an end plate 8 adapted to close the casing 2, and a flexible film 4 provided on the outside thereof. The same swelling type porous body 10 made of metal that bears the shape retention property at the time of contraction is fixed to the end plate 8 with the hook 10 ″ and the ring 10 ′ is fixed to the periphery of the end. There is.

The cylinder 9 and the porous body 10 extend concentrically in the casing 2, and at the base of the end plate 8, the flange 3, the flexible film 4, and the skirt are fastened together by bolts 11 to make close contact. The state is sealed.

Thus, a supply port 12 and a discharge port 13 for hydraulic oil 19 as hydraulic fluid are provided inside the cylinder 9 in the end plate 8, and the flexible film 4, the end plate 8 and the cylinder 9 are provided.
The space portion defined by and forms a pressure chamber 14.

The end plate 8 has a hole 15 at the center of the cylinder 9.
A rod 17 is pierced and a slide 17 is slidably inserted through a seal 16. A piston 18 for sliding the cylinder 9 is fixed to the tip of the rod 17.

The pressure chamber 14 surrounded by the end plate 8, the flexible film 4, the cylinder 9, and the piston 18 is filled with hydraulic oil 19, and a drain hole 20 is provided at a predetermined position of the end plate 8. The drain bolt 21 is provided and is closed.

Then, with respect to the pressurizing chamber 14 filled with the hydraulic oil 19,
A hole 22 is formed below the end plate 8 and a communication pipe 23 is fixedly provided. A box 24 is attached to the tip of the communication pipe 23, and a pair of electrodes 25, 25 are arranged close to each other inside the box 24.
Each of the lead wires is electrically connected to the buzzer device 26 by being implanted therein and insulated from each other, and the buzzer device 26 is activated when the electrodes 25, 25 become conductive.

The base end of the rod 17 extends to the outside of the casing 2, and a magnet 27 is provided at a predetermined position of the rod 17. The rod 17 has a stroke length of a piston 18 that moves forward and backward in the cylinder 9. A bottomed cylindrical cover 28 having an inner diameter slightly larger than the diameter of the rod 17 is welded and fixed to the end plate 8, and a well-known proximity switch is provided outside thereof.
Spool type in which 29 and 29 'are provided separately from each other by a set length, and lead wires from the proximity switches 29 and 29' are connected to the cylinder 9 (interposed in a general hydraulic circuit). Is electrically connected to an appropriate controller 31 connected to the electromagnetic switching valve 30 for switching.

Further, the circulation path of the hydraulic oil 19 from the electromagnetic switching valve 30 is connected to the supply port 12 provided in the casing 2 by the oil pump 3
2 and the discharge port 13 so that the working oil 19 can be selectively sucked and discharged through the supply port 12 and the discharge port 13.

The slurry suction port 5 is connected to the slurry tank 35 via the check valve 34, and the slurry discharge port 6 is connected to the filter press 37 via the check valve 36.

A pedestal 38 is fixed to the casing 2 so that the pressure feeding device 1 can be installed at a predetermined place in the plant.

In the above configuration, to pump the slurry to the filter press 37, which is installed in the slurry processing plant,
The hydraulic oil 19 is sent from the oil tank 33 to the pressure feeding device 1 via the pump 32, and the piston 18 in the cylinder 9 of the casing 2 is extruded through the supply port 12 of the casing 2 via the electromagnetic switching valve 30. The hydraulic oil 19 sealed in the pressurizing chamber 14 by the piston 18 acts as the flexible film 4 and the pressing force is uniformly applied to the entire surface thereof to expand.

In this first stage discharge process, the slurry in the supply chamber 7 is pressure-fed to the filter press 37 outside the casing 2.

The stroke end of the above-mentioned slurry discharge process is the rod 17
It is confirmed by the proximity of the magnet 27 provided on the cover 27 to the cover 28 and the proximity switch 29 'provided at a predetermined position on the outer periphery, and when the proximity switch 29' is activated, the signal is transmitted to the controller 31 and the electromagnetic switching is performed. The valve 30 is switched to the discharge side of the hydraulic oil 19 with respect to the cylinder 9, the hydraulic oil 19 is returned to the oil tank 32 by the pump 32 via the discharge port 13, the piston 18 moves to its backward stroke, and the inside of the casing 2 Hydraulic oil 19 in pressure chamber 14
At the same time as the gas flows into the cylinder 9, the flexible film 4 contracts and a negative pressure is generated in the feeding chamber 7.

Due to the negative pressure generated in the feeding chamber 7 in the backward stroke of the piston 18, the slurry is sucked from the slurry tank 35 through the suction port 5 into the feeding chamber 7 of the casing 2 through the suction port 5.

Thus, the stroke end of the backward stroke of the piston 18 is determined by the timing at which the magnet 27 provided on the rod 17 approaches the proximity switch 29 provided at a predetermined position in the cover 28, which timing is determined by the porous body. It is set at a time slightly earlier than the contact of the flexible film 4 with the contact member 10.

When the proximity switch 29 is operated, a detection signal is sent to the control device 31, and the electromagnetic valve 30 transfers the hydraulic oil 19 to the cylinder 9.
To the supply side and therefore the cylinder 9
The hydraulic oil 19 is supplied into the cylinder 9 through the supply port 12.
The process of advancing the piston 18 inside is repeated to normally exert the pressure feeding function of feeding the slurry in the feed chamber 7 in the casing 2 to the filter press 37 via the check valve 36.

Then, at any time during the process of supplying and discharging the hydraulic oil 19 to the cylinder 9, the flexible film 4 is unexpectedly cracked due to repeated expansion and contraction, deterioration over time, etc.
When the slurry in the feeding chamber 7 invades the hydraulic oil 19 when it retreats, moves to the communicating pipe 23, flows into the box 24, reaches the electrode 25, and becomes present between the electrodes 25, 25, the slurry is Being electrically conductive, the electrodes 25, 25 are electrically connected and the buzzer device 26
Is detected and the buzzer is activated.

In this way, the flexible film is indirectly provided by the buzzer device 26.
When a crack in 46 is confirmed, the pressure feeding device 1 is stopped, the bolt 11 is removed, the working oil 19 mixed with the slurry is discarded, the flexible membrane 4 is replaced, and the box 24 and the communication pipe 23 are removed. After removing and cleaning, attach it as before, remove the drain bolt 21 with the piston 18 retracted, and remove the hydraulic oil from the drain hole 20.
Can be filled in the pressurizing chamber 14 in the flexible membrane 4 to restore the pumping device 1.

It should be noted that, of course, the hydraulic oil 19
May be mixed, and there is no inconvenience even if the slurry is pressure-fed to the filter press 37.

The embodiment of the invention of this application is not limited to the above-mentioned embodiment, and for example, a limit switch is attached to the inner upper end of the cylinder, or is attached to the lowest point of the cylinder.
The lead wire hole is drilled in the casing, the lead wire is extended to the outside by sealing, and the lead wire is connected to the controller so that the limit switch works by advancing and retracting the piston so that the timing of supplying and discharging the hydraulic oil to the casing can be improved. Various modes, such as making a decision, can be adopted.

Further, the hydraulic fluid may be water instead of the hydraulic oil of the embodiment, and even in that case, there is no change in the action and effect, and the flexible membrane can be used as a liquid that is not easily deteriorated. Becomes higher.

Of course, the target liquid to be treated may be something other than the slurry.

<Effects of the Invention> As described above, according to the invention of this application, basically, equipment such as a circulating device for other hydraulic oil can be protected against cracking of a flexible film that expands and contracts in a pumping device, slurry, etc. It has the role of blocking the leakage of the liquid to be treated in the working liquid, and does not damage the device, so maintenance is simple and it is sufficient to replace or clean the flexible membrane only in the casing of the pumping device. , The time is short, the process interruption time that occurs during the pumping process can be shortened, and there is no time loss throughout the sludge process.Therefore, the pumping device can have an excellent function for its effective use. Excellent effect can be achieved.

Further, even if the flexible film is cracked, it is not always necessary to stop the device immediately, and it is guaranteed that the liquid to be treated such as slurry does not enter the circulation device of the hydraulic oil, so there is no risk of damaging the device. The effect is played.

Further, since the hydraulic oil is blocked from the liquid to be treated even during maintenance work due to cracks, the liquid to be treated such as slurry does not mix in the circulation device, and the device has sufficient reliability. Even if a crack occurs thereafter, the circulation device can be used in the same state, and therefore the pumping device has an excellent effect that it can quickly recover even if there is a crack in the flexible membrane.

In addition, since the cylinder is provided by utilizing the space inside the bulging flexible membrane, a small amount of the working fluid that becomes unusable due to the mixture of the liquid to be treated, such as slurry, can be discarded. This is a pressure-feeding device that is significantly reduced compared to the pressure-feeding device of the embodiment and is advantageous in terms of cost.

Further, a liquid that does not easily deteriorate the flexible film, such as inexpensive water, can be used as the working liquid, and in that case, there is an advantage that the invention of this application has an advantage that the life of the flexible film is long.

[Brief description of drawings]

The drawings show one embodiment of the invention of this application,
FIG. 1 is a schematic cross-sectional view, and FIG. 2 is a cross-sectional view of an aspect when a crack is generated in a flexible film. 1 ... Pressure feeding device, 2 ... Casing, 4 ... Flexible membrane, 5 ... Suction port, 6 ... Discharge port, 7 ... Feed chamber, 14 ... Pressure chamber, 19 ... Hydraulic fluid, 9 ... Cylinder

Claims (4)

[Claims] 1. A bulging-type flexible film provided in the casing with its skirt portion being in contact with the casing and the end plate faces a supply / discharge port of the liquid to be treated provided on one side of the casing. The flexible membrane is sealed by a feed chamber formed by the outside and a casing, a piston in a cylinder extended from the end plate into the casing, the cylinder and the flexible membrane. In a structure of a pressure feeding device that is enclosed by a formed pressure chamber, the working fluid is sealed in a flexible membrane through a piston that liquid-tightly slides in a cylinder in the pressure chamber. And pumping device structure. 2. The pumping device structure according to claim 1, wherein the cylinder is a cylinder of a hydraulic device. 3. The structure of the pressure feeding device according to claim 1, wherein a stroke detection switch is attached to the cylinder. 4. The structure according to claim 1, wherein the stroke detection switch is a limit switch.