JPH0754116B2 - Pumping device structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The disclosed technique is a pumping device for a slurry or the like having a bulging flexible film made of rubber, which is a pumping device that maintains the expansion and contraction function of the flexible film. It belongs to the technical field of device structure.

<Summary of Summary> The present invention has a rubber inside a casing having a supply / discharge port for a liquid to be treated such as slurry on one side and a supply / discharge port for a circulating liquid such as working oil on the other side. A bulging flexible membrane with a wide base made narrower toward the front is tightly fixed to the casing at the end, and the flexible membrane is bonded by fixing the tip to the inner surface of the front. The present invention relates to a pumping device that is supported in a direction perpendicular to expansion and contraction through an expanded and contracted rod, and in particular, in the expanded posture of the flexible film, the entire outer surface of the flexible film is brought into contact with the outer surface of the flexible film and further expanded. The present invention relates to a pumping device provided with a cup-shaped perforated plate, which is made of a metal and which allows a liquid to be treated such as a slurry to pass therethrough, to be fixed to the casing by fixing it to the casing.

<Prior Art> Generally, a pressure-feeding device used when a water-containing viscous substance of a liquid to be treated such as a slurry is subjected to solid separation is a high-output diaphragm-type pressure-feeding device having a flexible membrane inside and pushing out. Is often used, it does not have a sliding part mechanically as compared with a feeding device such as a rotary pump or a cylinder, and there is no problem that trapped foreign matters such as solid content of slurry enter, It is a pressure-feeding device suitable for use in, and is widely used in the sludge treatment field and the like.

Then, the output of the seed pressure feeding device is performed by the pressure transmitted by the hydraulic pump pressurizing the working oil to act on the rubber-made flexible film provided in the pressure feeding device. It is a member that is frequently deformed by repeated expansion and contraction.

In consideration of the improvement of the durability of the flexible film, in the flexible film of the bulging type, the original shape in the initial stage of the setting is kept as much as possible in order to prevent the unexpected deformation of the flexible film and the wear due to fatigue. Advantageously, a sleeve-type rod that is fixed to the inside of the flexible film and slides back and forth following the operation of the flexible film is provided as a support for maintaining shape retention.

Further, as a means for preventing the deformation of the flexible film, in order to prevent the deformation due to drooping, a mode in which a perforated plate is provided below the flexible film inside the casing to support the flexible film is disclosed in, for example, Japanese Patent Application No. 61-61 No. 59295 (Japanese Patent Publication No. 3-23756) has been devised as an invention.

In the pressure feeding device 1, as shown in FIG. 2, for example, a suction port 4 for a liquid to be treated such as slurry is provided on one side 3 of a drum-shaped casing 2 and a tank 5 for the slurry or the like and an electromagnetic valve 6 are provided. , The slurry supply port 7 is connected to the next stage processing device 8 such as a filter press via the electromagnetic valve 6, and the other side 9 of the casing 2 is provided with a suction port 10 for operating oil such as oil. A pump 12 is provided to feed hydraulic oil from a hydraulic oil tank 13 into the casing 2 via an electromagnetic valve 11, and a discharge port 14 for discharging the hydraulic oil sucked into the casing 2 is provided. Further, on the other side 9 of the casing on the hydraulic oil side, a wide base portion is closely fixed at its end portion, and a flexible rubber-made swelling flexible membrane 15 having a narrowed tip portion is formed on the casing. It is installed and installed in 2,
Due to the flexible film 15, the inside of the casing 2 is filled with a liquid to be treated 16 such as slurry, and an outer feed chamber 16 'and hydraulic oil such as oil.
It is surrounded by an inner pressure chamber 17 'occupied by 17.

The other side 9 of the casing 2 in the pressurizing chamber 17 '
The base end portion of the sleeve 18 is fixed to the center portion of the inner surface of the inner wall of the flexible membrane 15, and the rod 19 having the distal end portion vulcanized and fixed inside the flexible membrane 15 close to the pressure chamber 17 'is inserted to apply pressure. It is telescoping in the chamber 17 'and the rod 19 carries the downward load of the flexible membrane 15.

Further, a perforated plate 20 is attached to the casing 2 below the flexible film 15 to support the flexible film 15 in a suspended posture during contraction and prevent the flexible film 15 from being deformed during expansion and contraction. We try to prevent fatigue failure as much as possible.

<Problems to be Solved by the Invention> However, in the deformation preventing structure of the bulging flexible film 15 accompanied by the expansion and contraction of the conventional pumping device 1, the flexible film 15 can be expanded and contracted from its original shape. In the portion of the flexible film 15 beyond the perforated plate 20, there is a deformation such that the tip portion hangs down on both sides of the rod 19, which causes fatigue in that portion of the flexible film 15 and causes a crack in the flexible film 15. There was a difficulty.

Further, when the working oil first flows into the droop in the process of sucking the working oil, an excessive internal pressure is applied to the droop when filling the working oil, so that the working oil does not flow smoothly. Not only that, there is a problem in that the flexible film 15 is accelerated to deteriorate.

Furthermore, in the expansion process of the flexible membrane 15, the casing 2
When the casing 2 forms a corner portion because the flexible film 15 may adhere to the wall surface of the flexible film 15, the flexible film 15 is bent at the corner portion in a warped posture or the like, and as a result,
There are inconveniences such as early fatigue and cracking.

Further, when the flexible membrane 15 separately contacts the porous plate 20 and the inner surface of the casing 2 on the opposite side, the surface pressure becomes different, and if this is repeated, from this point, the uneven wear of the flexible membrane is caused. There is a negative point that durability is deteriorated due to the occurrence of.

<Object of the Invention> An object of the present invention is to solve the problem of fatigue of the flexible membrane of the pressure-feeding device having the flexible membrane based on the above-mentioned conventional technique, and to solve the problem from the initial set original shape of the flexible membrane. It is possible to improve the durability of the flexible film by smoothing the expansion and contraction of the flexible film without causing local load or deformation, which is beneficial for the application field of liquid processing technology in various manufacturing industries. It is intended to provide a pressure feeding device.

<Means and Actions for Solving the Problems> In order to solve the above-mentioned problems, the configuration of the present invention based on the above-mentioned object is achieved by a pumping device for operating oil from an oil tank by means of an oil pump. Supply and discharge from one side of the casing with respect to the pressure chamber inside the flexible film in the casing, and as the expansion and contraction of the flexible film, suck the slurry in the slurry tank from the slurry supply port on the other side of the casing, Further, when discharging from the slurry discharge port to the next step such as a filter press, a flexible film that expands and contracts in the slurry supply and discharge process described above is provided with an expandable rod extending from the inside to connect the base ends thereof, The force applied in the vertical direction is supported by the telescopic rod to prevent the flexible film from being deformed in the expansion / contraction direction.
The flexible membrane expands due to the feeding of the working oil,
Alternatively, a cup-shaped perforated plate, which is formed in such a shape that a flexible membrane such as a bulging type that suppresses the expansion in the longitudinal direction entirely on the outer side is abutted from the inner side, is attached inside the casing, and a local portion of the flexible membrane is formed. The technical measures have been taken to eliminate the deformation entirely, improve the durability of the pressure-feeding device, and achieve smooth and uniform expansion and contraction of the flexible film.

<Embodiment> Next, one embodiment of the present invention will be described below with reference to FIG.

It should be noted that parts that are the same as in FIG. 2 will be described using the same reference numerals.

In the illustrated embodiment, reference numeral 1'denotes a pressure-feeding device forming the subject matter of the present invention.
Is provided with a slurry suction port 4 and is connected to a slurry tank 5 through an electromagnetic valve 6, and a slurry feed port 7
Is connected to the next-stage filter press 8 via an electromagnetic valve 6, and a hydraulic oil supply port 10 is connected to the other side 9 of the casing 2 via a switching valve 11 to an oil tank 13 by an oil pump 12. Also, the hydraulic oil outlet 14
Is also connected to the oil tank 13 via the switching valve 11.

The inside of the casing 2 has a wide base made of rubber, which is different from the conventional flat diaphragm, and the bulging flexible membrane 15 that has been narrowed from the front is fixed to the casing 2 at the base. The casing 16 is attached to the outside, and the inside of the casing 2 is a feeding chamber 16 (of the flexible film 15) on which the slurry 16 is sucked.
´ and hydraulic fluid 17 is injected inside (pressurized membrane 15) pressurized liquid 17
Further, a rod 19 is inserted into a sleeve 18 having a base end portion fixed inwardly to the other side 9 of the casing 2, and the tip of the rod 19 is vulcanized so that the flexible film 15 is formed. It is fixed to the inner surface of the flexible membrane 15 so that the flexible membrane 15 is supported by the shape retention.

Thus, the slurry 16 is supplied to and discharged from one side (outer side) of the flexible film 15 in the casing 2 and the hydraulic oil 17 is supplied to the other side (inner side) thereof. The uniform pressure is applied to the flexible film 15 to expand and contract the expansion rod 19 with respect to the sleeve 18 so that the original position of the expansion type is maintained as much as possible.

A metallic perforated plate 20 ', which is formed into a cup shape with a gentle curved surface, is provided in the casing 2 by welding the base portion to the inner surface of the casing 2.

In the above-mentioned configuration, when the pumping device 1 ′ is in operation, the pump
12 is operated, the switching valve 11 is switched to feed hydraulic oil 17 into the casing 2, and hydraulic oil 17 is supplied from the suction port 10 to the pressurizing chamber 17
Although the hydraulic oil 17 expands the pressurizing chamber 17 ′ in the casing 2 as it fills the ′ ′, the overall hanging of the flexible membrane 15 does not appear due to the support through the expansion / contraction of the expansion / contraction rod 19. Further, in the process in which the hydraulic oil 17 is fed, the flexible membrane 15 keeps its original shape as much as possible, the pressurizing chamber 17 'is filled with the hydraulic oil 17, and then the expandable rod 19 is expanded. The flexible film 15 supports the flexible film 15, while the flexible film 15 is entirely expanded in the circumferential direction and the longitudinal direction to expand in the casing 2.

As a result, the capacity of the feed chamber 16 'is reduced, and as a result, the slurry 16 stored in the feed chamber 16' is replaced by the electromagnetic valve 6
By opening the valve, the filter press 8
Pumped to.

Then, the flexible film 15 which is held in the bulging shape by the telescopic rod 19 and expands contacts the entire surface of the metal perforated plate 20 'provided inside the casing 2 on the outside thereof, and the contact In this state, the expansion is uniformly suppressed over the entire surface of the flexible film 15, there is no local bending of the flexible film 15 at the corner of the casing 2, and the holes of the perforated plate 20 'are the slurry 16 The discharge is sufficiently smooth without blocking the passage of.

Then, after the expansion is stopped, the switching valve 11 is operated in a state where the inlet 4 and the outlet 7 are communicated with each other by the gap between the casing 2 and the flexible film 15, and the hydraulic oil 17 is pressurized from the pressurizing chamber 17 '. And the discharge port 14 provided on the other side 9 of the casing 2.
It is returned to the oil tank 13 and the flexible film 15 is contracted by the negative pressure.

In this process, in the feeding chamber 16 ′, the slurry 16 is passed from the slurry tank 5 through the solenoid valve 6 and the flexible membrane 15 is contracted from the suction port 4 provided on the one side 3 of the casing 2 as the slurry 16 is reduced.
Is inhaled.

Even in the above-described process, the flexible film 15 that was in contact with the entire surface of the perforated plate 20 ′ and was uniformly expanded was used to expand and contract the rod 19 and the flexible film 15 even when the hydraulic oil 17 was discharged. Is retreated from the central tip end portion on the central axis in the casing 2, and swollen quickly while maintaining the bulging shape.

Thus, the original shape and surface texture of the bulging flexible film 15 made of rubber are maintained.

It should be noted that the embodiment of the present invention is not limited to the above-mentioned embodiment.
It is possible to adopt various modes such as welding and integrating the lower part of the casing as the division.

Needless to say, a wire mesh can be used for the perforated plate as long as the slurry can pass through and the strength is sufficient.

<Effects of the Invention> As described above, according to the present invention, the local deformation of the flexible film is basically prevented, and folds, hardening, and cracks due to repeated expansion and contraction are prevented and reduced, and the durability of the pressure feeding device is improved. The excellent effect of doing is achieved.

Thus, the flexible film made of rubber is expanded by the tension, and the expanded form exhibits a smooth curved surface, and since the expanded state is maintained in the casing, the flexible film made of rubber is By providing a perforated plate that directly contacts the expanding curved surface to prevent further expansion after contact, the slurry is discharged from the perforated plate, and solids such as contaminants are removed between the perforated plate and the flexible film. A pressure-feeding device structure capable of coping with fatigue that is exacerbated from a bent portion once the flexible film is uniformly expanded and contracted even in the longitudinal direction of the casing without interposing an object, The invention of this application is provided with a means for restricting the expansion of the flexible film in the pumping device, and has the effect of being able to provide a pumping device having not only durability but also excellent supply and discharge efficiency. Played.

Thus, as the liquid to be treated is supplied and discharged, the center end of the flexible film is set in the casing central axis direction by the expandable rod that is expandable and contractible by the expanding flexible film and supports the flexible film. Since it is linearly guided and moved, it is uniformly expanded and contracted in the circumferential direction, and since the flexible film is formed into a cup shape and abuts against the metal perforated plate mounted in the casing from inside, it is made of rubber. The flexible membrane is extremely suppressed from further expansion on the whole surface, thus preventing folds and wear, and not receiving excessive pressure as a whole, which is an excellent effect that the durability of the pumping device is improved. To be done.

Furthermore, if unreasonable force or deformation is applied to the flexible membrane made of rubber that causes early fatigue, even if some dent deformation occurs, it will be wide in the casing. The flexible membrane mounted with the base fixedly attached can effectively resist the deformation by its tension, and the effect of the pumping device of the present invention to make the pumping action remarkable and ensure the long-term durability. Is played.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of one embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of a conventional pressure feeding device. 4 …… Slurry inlet, 7 …… Slurry inlet / outlet, 10 ……
Oil supply port, 14 ... Oil discharge port, 2 ... Casing, 15 ... Flexible membrane, 19 ... Telescopic rod, 1, 1 '... Pumping device, 20' ... Perforated plate

Claims (1)

[Claims] 1. A bulging flexible membrane having a wide base and a narrowed front end inside a casing having a slurry supply / discharge port on one side and an oil supply / discharge port on the other side. In a pumping device structure in which the flexible membrane is fixedly set in the casing and the flexible membrane is supported inside by a telescopic rod provided in the casing, the entire outer surface of the flexible membrane in the expanded posture is brought into contact with the casing. A pumping device structure characterized in that a cup-shaped perforated metal plate for external encapsulation is attached with its base fixed.