JPH09151855A - Double tube diaphragm pump, double tube diaphragm and double tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect the damage to a diaphragm by forming a pump chamber of a double tube diaphragm disposed in such a way as to pierce the inside of an oil pressure chamber with a volumetric change generated by the reciprocating motion of a piston, and detecting a state change between tubes to detect the damage to the tube. SOLUTION: When a piston 3b is moved backward, a double tube diaphragm 4 is enlarged, and a fluid is led into a pump chamber 8 from a fluid lead-in pipe 9. When the piston 3b is moved forward, the double tube diaphragm 4 is contracted, and the fluid in the pump chamber 8 is discharged to a fluid lead-out pipe 10. When an outer tube 4a, for instance, is damaged in such a state, operating oil infiltrates into a clearance between the outer tube 4a and an inner tube 4b. Infiltrating operating oil is discharged to the tube damage detecting means 5 side during a discharge stroke, for instance, and when a fluid pressure sensor 5c detects the pressure of the operating oil reaching a fluid reservoir part 5e, an alarm is sent out by an alarm means 5d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-tube flam pump, a double-tube flam used in the double-tube flam pump, and a method for manufacturing the double-tube flam. Double tube flam pump that can prevent the occurrence of breakage of tube flam and know the time of tube replacement, double tube flam suitable for such convenient and excellent double tube flam pump, and such The present invention relates to a double tube flam manufacturing method capable of easily manufacturing a double tube flam.

[0002]

2. Description of the Related Art Conventionally, a tube flam used in a hydraulic tube flam pump has been a resin or rubber tube alone. Therefore, there is a problem that when the tube flam is damaged, the hydraulic oil mixes with the transfer liquid in the tube flam.

On the other hand, the hydraulic diaphragm pump has a diaphragm whose peripheral portion is fixed. In this hydraulic diaphragm, the pump action is exerted by expanding the diaphragm toward the pump chamber side or the side opposite to the pump chamber by the hydraulic oil that is sucked and pressed. By the way, since the amount of deformation of the diaphragm due to such expansion is several% to 10% of its diameter, it is considered that the diameter of the diaphragm should be increased in order to increase the discharge amount of the transfer liquid by the pump chamber. To be In other words, the aim is to increase the size of the hydraulic diaphragm pump.

However, even if the hydraulic diaphragm pump is increased in size, the deformation amount of the diaphragm is not as large as expected and is small, and the dead volume in the pump chamber is large, and as a result, the flow velocity itself is as expected. Does not grow. Further, since the passage velocity of the transfer liquid does not increase in spite of the increase in the volume of the pump chamber, for example, when the transfer liquid is a slurry liquid or a solid-liquid mixed phase flow having a high sedimentation speed, the sedimentation of particles in the pump chamber This will occur and interfere with the suction and discharge of the transfer liquid.

When a hydraulic diaphragm pump is used to suck and discharge chemicals or the like, in the pump chamber of the hydraulic diaphragm pump, even if the diaphragm is originally made of a chemical resistant material, the pump in contact with the transfer liquid There is a problem that all the interior walls must be made of high-grade chemical resistant material. This problem leads to the problem that a special hydraulic diaphragm pump in which the inner wall of the pump chamber is formed with a special specification must be customized according to the type of liquid to be transferred.

There is also a type of hydraulic diaphragm pump having a diaphragm composed of a double membrane. In this type of hydraulic diaphragm pump, a sealed space for filling a liquid is formed between two membranes, and a detector for detecting a change in the physical quantity of the sealed space is provided, whereby a diaphragm composed of a double membrane is provided. It is possible to detect the damage.

In such a hydraulic diaphragm pump, the technique of doubling the diaphragm cannot be immediately applied to the hydraulic tube diaphragm pump. This is because the diaphragm and the tube diaphragm are completely different in shape and structure. Furthermore, since it is necessary to mount the tube flam in the hydraulic chamber, the tube flam in the hydraulic tube flam pump needs flare portions formed by folding back both ends of the tube to form a brim. When attempting to form a double tube flam, flares must be provided on each of the inner and outer tubes. However, even if the inner tube is inserted into the outer tube, the flare portion of the inner tube hinders the insertion. In addition, even if the flare portion of the inner tube is formed small and the inner tube having such a flare portion is inserted into the outer tube, the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube do not adhere to each other. A gap opens. Even if a double tube flam with a gap between the inner tube and the outer tube is applied to a hydraulic tube flam pump, such a pump will not be able to sufficiently transfer the pressure applied to the outer tube to the inner tube. It is no longer practical, and the pump function deteriorates, making it impractical.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a double tube flam pump capable of detecting breakage of a tube when the tube is broken. SUMMARY OF THE INVENTION An object of the present invention is to provide a double tube flam pump capable of easily knowing the tube replacement timing before a tube breakage accident such that the pump function completely stops. An object of the present invention is to provide a double tube flam pump using a double tube flam capable of sufficiently exerting a pump function. An object of the present invention is to provide a double tube flam suitable for the above double tube flam pump. The object of the present invention is to make the inner tube inside the outer tube, the inner peripheral surface of the outer tube and the outer circumference of the inner tube even though there are flare portions at both ends of the inner tube and the outer tube. The object is to provide a double tube flam that is housed so that it can come into contact with the surface. It is an object of the present invention to provide a method capable of producing the double tube flam preferably and easily.

[0009]

According to a first aspect of the present invention, there is provided a hydraulic chamber for containing hydraulic oil, a suction pressing means, a pump chamber, and a tube breakage detecting means. A cylinder and a piston are provided, and the inside of the tip of the cylinder forms a part of the hydraulic chamber, and the reciprocating motion of the piston causes a partial volume change inside the tip of the cylinder to generate hydraulic oil in the hydraulic chamber. Is formed so as to suck and press the pump chamber, the pump chamber is formed so as to penetrate the hydraulic chamber, and is formed by a double tube flam formed by laminating a plurality of flexible tubes in a non-adhesive state with each other. The damage detection means is a double-tube flam pump characterized by comprising a detector for detecting a change in state between the flexible tubes, and the damage detection means is a double-tube flam pump. The invention according to claim 1, wherein the double tube flam comprises a plurality of flexible tubes forming the double tube flam maintained in a reduced pressure state in the mutual gap, and the detector is a pressure detector. The invention according to claim 3 is the pump, wherein the double tube flam is formed by loading an incompressible fluid in a mutual gap of a plurality of flexible tubes forming the double tube flam, and the tube breakage detection means is The double-tube flam pump according to claim 1, further comprising a flow path connecting a flexible tube and the detector and having a check valve in the middle thereof, wherein the detector is a pressure detector. According to the invention of claim 4, in the double tube flam, the outermost flexible tube is made of an oil resistant elastomer, and the innermost flexible tube is made of a chemical resistant synthetic resin. It is made by,
Each flexible tube forming the double-tube flam has a flare portion at its end, and the oil-resistant elastomer is filled into a mold in which a tube that can be the flexible tube of the innermost layer is placed and integrally molded. The double tube flam pump according to any one of claims 1 to 3, wherein the double tube flam has an outermost flexible tube made of an oil resistant elastomer. The outermost flexible tube is formed separately from the outermost flexible tube, and the innermost flexible tube is made of a chemical resistant synthetic resin or elastomer and is formed inside the preformed outermost flexible tube. The flexible tube according to claim 1, wherein an incompressible fluid is loaded between the flexible tubes formed by inserting the flexible tube.
The double-tube flam pump according to any one of claims 1 to 4, wherein the double-tube flam has one end or both ends of the outermost flexible tube and the innermost flexible tube hermetically joined. The double-tube flam pump according to any one of claims 1 to 5, wherein the invention according to claim 7 has flare portions at both ends and is formed of a chemical resistant synthetic resin. A flexible tube and an outer flexible tube formed of an oil resistant elastomer, having flare portions at both ends and having an inner peripheral surface that comes into non-adhesive contact with the outer peripheral surface of the inner flexible tube. A double tube flam characterized by having an inner flexible tube formed of a chemical resistant synthetic resin in a mold, wherein the inner flexible tube in the mold is flexible. A method of making a double tubephragm according to claim 7, characterized in that hot forming the outer flexible tube by injecting oil elastomer on the outer peripheral surface of the tube.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A double-tube flam pump according to the present invention has a hydraulic chamber, a suction pressing means, a double-tube flam, and a tube breakage detecting means.

The hydraulic chamber contains hydraulic oil. This hydraulic chamber has a function of contracting, expanding, or contracting and expanding the double tube flam by the pressure of the hydraulic oil, and its shape, structure, size, etc. are appropriately selected according to the purpose.

The hydraulic oil is not particularly limited as long as it is a liquid having a low compression ratio, and oils such as gear oil, hydraulic hydraulic oil, torque converter oil and the like are preferable examples.

The suction and pressing means includes a cylinder and a piston, the inside of the tip of the cylinder forms a part of the hydraulic chamber, and the piston reciprocates in the cylinder to partially move the inside of the tip of the cylinder. It is formed to have a function of inducing a large volume change and sucking and pressing the hydraulic oil in the hydraulic chamber. As an example of the suction pressing means, a cylinder opened to the hydraulic chamber and a piston mounted in the cylinder so as to reciprocate in the cylinder are provided, and the hydraulic oil in the hydraulic chamber is sucked by reciprocating the piston. Means that can be pressed can be mentioned.

The double tube flam comprises a plurality of tubes, and the tubes are arranged concentrically.
Although the number of tubes is not limited, the number of tubes is usually 2 or 3, and the preferred number is 2. In other words, a suitable double tube flam has an inner tube and an outer tube.

The tubes are arranged in a non-adhered state to each other. In this case, each tube may be in contact with other tubes on their surfaces, or may have a gap therebetween. A preferred double tube flam comprises two tubes, an inner tube and an outer tube, with the inner tube located inside the outer tube. In the double-tube double-flame having the outer tube and the inner tube, the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube are in a non-adhesive state. Further, the outer tube and the inner tube may be in contact with each other, or may have a gap to the extent that an incompressible fluid exists. When pressure from the outside of the double tube flam is applied to the inner tube, the pressure must be reduced between the outer tube and the inner tube, or incompressible. It needs to be filled with fluid.

Further, when the double tube flam is formed by the outer tube and the inner tube, the hydraulic oil or the transfer liquid permeates between the outer tube and the inner tube due to the breakage of either the outer tube or the inner tube, and this transfer When the liquid enters, the tube breakage detecting means can detect the pressure change between the outer tube and the inner tube.

Each of the plurality of tubes forming the double tube flam has a flare portion at its end.
The flare portion is a brim-shaped portion that is formed at both ends of the tube body and spreads outside the tube body.

In this double tube flam, it is desirable that one end of the outer tube and one end of the inner tube are integrally joined, or both ends of the outer tube are integrally joined to both ends of the inner tube. In this case, the joint portion may be adhered with an adhesive or may be in an adhered state. By integrally joining one end or both ends of the outer tube and one end or both ends of the inner tube in this manner, an incompressible fluid can be loaded between the outer tube and the inner tube. There is an advantage that the air existing between and can be easily replaced with the non-compressible fluid, or the pressure between the outer tube and the inner tube can be reduced.

Both the outer tube and the inner tube forming the double tube flam need to be formed of a flexible material, preferably a flexible and elastic material. By having flexibility, the double tube flam can be deformed and compressed by pressurization with hydraulic oil.

The outer tube of the double-tube flam is preferably oil resistant, and the inner tube is preferably resistant to the transfer liquid, particularly chemical resistant.

Examples of materials having flexibility and oil resistance for forming the outer tube of the double-tube flam include, for example, natural rubber, nitrile butadiene rubber (NBR), isoprene rubber, styrene butadiene rubber, chloroprene rubber, and silicone rubber. Of these, synthetic rubbers such as fluorine rubber, EPDM, and oils such as Hypalon, which have oil resistance, can be mentioned.

Examples of materials having flexibility and chemical resistance for forming the inner tube of the double-tube flam include chemical-resistant synthetic resins such as fluororesins, polyolefin resins such as polypropylene and polyethylene, and fluororubbers. Examples include chemical resistant elastomers such as EPDM and Hypalon.

The choice of materials for the outer and inner tubes may depend on the method of making the double tube flam.

For example, when the outer tube and the inner tube are manufactured by integral molding, the inner tube is made of a flexible and chemically resistant synthetic resin, especially a fluorine resin, and the outer tube is made of an oil resistant elastomer. Is preferred. When such a material is selected, the double tube flam is manufactured by integral molding as follows.

That is, first, a synthetic resin having chemical resistance is used to obtain a cylindrical inner tube having flange-shaped flare portions at both ends. The inner tube is placed in a mold for double tube flam production. At this time, a core of the same shape is inserted in the inner cylindrical space of the inner tube. In the mold, an oil-resistant elastomer, such as NBR, which is in a melted state and is flowable by heating is injected between the outer peripheral surface of the inner tube and the inner wall surface of the mold. The double tube flam can be obtained by removing the mold after cooling for a predetermined time after the injection. In this case, the NBR is press-molded at a temperature of about 180 ° C., but at this temperature, the fluororesin does not cause deformation that would cause a problem in the function of the double tube flam, so the NBR is pressure-molded. be able to. Moreover, since the fluororesin has a good releasability, even if it comes into close contact with an elastomer such as NBR during molding, it does not adhere to the outer tube made of elastomer.

In this manufacturing method, as the shape of the inner tube, flare portions that spread outward in a brim shape are provided at both ends of the inner tube, and the outer surface of one end of the inner tube extends from the flare portion to the peripheral surface. It is preferable to provide a tapered surface formed over the entire circumference, and further provide one or a plurality of linear protrusions formed along the center line on the tapered surface. The length of the outer tube formed by integral molding (length along the axial direction) is made shorter than the length of the inner tube (length along the axial direction), and the end portion where the tapered surface of the inner tube is formed So that the flare portion of the outer tube overlaps the flare portion of the outer tube at one end, and thus the flare portion of the inner tube at the end where the tapered surface is not formed and the flare portion at the other end of the outer tube are separated from each other. When the tube and the outer tube are integrally formed by the manufacturing method,
The inner tube that is in close contact with the outer tube can be easily pulled out from the end side that has the tapered surface, and by pulling it out, the flare portion of the inner tube that has the tapered surface and the flare portion of the outer tube It is possible to form a space for accommodating a spacer, which will be described later, by separating from and. Further, the linear projection forms a linear groove on the inner peripheral surface of the end portion of the outer tube. When the inner tube or the outer tube is damaged during operation of the double tube flam pump, this groove allows the working oil or transfer liquid that has entered the gap between the inner tube and the outer tube to be detected by the tube breakage detection means. It is convenient because it can exert the action of guiding to.

In the manufacturing method by this integral molding, when pulling out the inner tube from the outer tube, an adhesive agent or the like is applied to the flare portion of the inner tube (flare portion at the end where the tapered surface is not formed). By pulling out the inner tube, the flare part coated with the adhesive adheres to the flare part of the outer tube, and a double tube flam obtained by hermetically sealing one end of the inner tube and one end of the outer tube is obtained. .

As a method different from the method of manufacturing the double tube flam by the integral molding, there is a method of manufacturing the double tube flam by assembling the inner tube and the outer tube which are separately manufactured.

In this manufacturing method, a chemical resistant synthetic resin such as fluororesin, polyethylene or polypropylene is selected as the material of the inner tube, and an oil resistant elastomer is selected as the material of the outer tube. The inner tube has an annular flare portion that spreads like a flange toward the outside at one end opening of the inner tube, and is larger than that at the one end opening without providing a flare portion at the other end of the inner tube. It comprises a thick opening having a wall thickness. The outer tube is
The inner tube has an axial length shorter than the axial length, and both end portions thereof have annular flare portions that spread outward in a flange shape. The inner tube and the outer tube having such a shape are manufactured by molding, and the inner tube is inserted into the inner space of the outer tube from the thick opening side, and the flare portion of the inner tube and the flare portion of the outer tube are inserted. The inner tube is pulled so that and are joined together, for example with an adhesive. By doing so, it is possible to manufacture a double tube flam composed of an inner tube and an outer tube.

As another method of manufacturing the double tube flam, there is also a method of separately manufacturing an inner tube made of a chemical resistant elastomer and an outer tube made of an oil resistant elastomer and assembling them. In this method, both of the inner tube and the outer tube may be provided with annular flare portions that spread outward in a brim shape at the opening portions at both ends. In this method, the double tube flam is easily manufactured by inserting the inner tube, which is compressed in the radial direction by twisting or the like, into the inner space of the outer tube.

In any of the manufacturing methods, in the double tube flam according to the present invention, for example, the space between the inner tube and the outer tube is a space or a space under reduced pressure, or a space filled with an incompressible fluid. To be

By doing so, for example, the pressing force and suction force of the hydraulic oil can be satisfactorily transmitted from the outer tube to the inner tube.

The tube breakage detecting means has a function capable of detecting a state change between the flexible outer tube and the flexible inner tube in the double tube flam. A suitable tube breakage detecting means is to detect a change in the physical quantity of the inner space formed by the outer tube and the inner tube in the double tube flam (this inner space may be referred to as a tube chamber) or the state of the tube chamber. It is provided so that Examples of the physical quantity in the tube chamber include the pressure in the tube chamber, the temperature in the tube chamber, the electric conductivity or the electric resistance value in the tube chamber, and the like. Examples of the change in the state of the tube chamber include a state change in which the pressure in the tube chamber, which has been decompressed until then, is filled with a liquid.

A preferable tube breakage detecting means is (1) a detecting means formed of an outer tube and an inner tube, and having a pressure detector for detecting a pressure increase in the tube chamber maintained at a predetermined reduced pressure, And (2) a pressure detector, a flow path for guiding the incompressible fluid filled in the tube chamber to the pressure detector, and a check valve provided in the flow path. Detection means, etc.

In the detection means of the above (1), if either the outer tube or the inner tube is damaged during the operation of the double tube flam, either the working oil or the moving liquid will enter the tube chamber. , The pressure inside the tube chamber, which had been maintained at a reduced pressure up to that point, rises rapidly due to the hydraulic fluid and moving fluid that have entered, and the pressure detector detects this increased pressure to detect damage to the double tube flam. be able to. The pressure detector may be provided directly in the tube chamber, but normally it is provided in the flow path provided so as to communicate with the tube chamber. This flow path may be a space that allows the hydraulic oil or the transfer liquid that has entered the tube chamber to reach the pressure detector, and may be a pipe, for example.

In the detecting means of the above (2), when the double tube flam pump is operated, the incompressible fluid in the tube chamber is also pressurized according to the pressure suction of the hydraulic oil, and the pressurized incompressible fluid is It is pushed through the check valve into the flow path between the check valve and the pressure detector. When the double tube flam pump continues to be driven, the incompressible fluid that had filled the tube chamber and the flow path from the tube chamber to the check valve eventually moved to the flow path from the check valve to the pressure detector. As a result, almost no incompressible fluid exists in the tube chamber and the flow path from the tube chamber to the check valve. The pump operates in this state, but if the double tube flam is damaged in such a state, the hydraulic oil or transfer liquid will enter the tube chamber and the pressure inside the tube chamber will increase. The flow path between the valve and the pressure detector also enters, and the pressure detector detects an abnormal pressure change.

The double tube flam pump of the present invention is manufactured so as to have the following assembly.

That is, the double-tube flam pump of the present invention is arranged in the hydraulic chamber so that the double-tube flam penetrates the hydraulic chamber, and the fluid introduction path is connected to the one end opening of the double-tube flam. A fluid outlet path is connected to the opening at the other end of the flam.

When the double tube flam is arranged in the hydraulic chamber, the flare portion of the outer tube is provided outside the edges of the pair of upper and lower mounting holes formed in the wall forming the hydraulic chamber (the outer side as viewed from the inside of the hydraulic chamber). Due to the overlap, liquid tightness in the hydraulic chamber is ensured by this flare portion. Further, if the inner tube is arranged so that the flare portion of the inner tube overlaps the flare portion of the outer tube, the airtightness of the tube chamber is ensured.

When the fluid is discharged from the pump chamber, which is formed in the inner space of the inner tube of the double tube flam, into the fluid outlet passage, the fluid flows backward from the pump chamber into the fluid inlet passage. A check valve, such as a ball valve, is preferably provided to prevent the fluid in the fluid discharge passage from flowing back into the pump chamber when the fluid is introduced into the pump chamber from the fluid introduction passage. A check valve such as a ball valve is preferably provided.

A tube breakage detecting means is provided in the tube chamber of the double tube flam.

A suction pressing means faces the hydraulic chamber, and the working oil in the hydraulic chamber is sucked and pressed by the suction pressing means. The cylinder is arranged such that the opening of the cylinder in the suction pressing means opens into the hydraulic chamber, and the working oil in the hydraulic chamber is sucked and pressed by the reciprocating movement of the piston loaded in the cylinder.

Next, the operation of the double tube flam pump of the present invention will be described.

The fluid introduction passage in the double flam pump of the present invention is connected to a fluid supply unit, such as a storage tank or a tank, which is installed at a predetermined external location, which is connected via an appropriate pipe or the like. By driving the suction pressing means, for example, the piston in the cylinder is retracted to suck the working oil in the hydraulic chamber, and the double tube flam is expanded. The fluid is introduced into the pump chamber from the fluid introduction passage due to the expansion of the double tube flam. Next, when the suction / press means is driven, for example, the piston in the cylinder is moved forward to press the hydraulic oil in the hydraulic chamber, the double tube flam is contracted, and the fluid in the pump chamber is led to the fluid outlet passage. By repeating the reciprocating motion of the piston, for example, by repeatedly driving the suction / pressing means, the double tube flam is inflated and contracted to continuously suck the fluid into the pump chamber and discharge the fluid from the pump chamber. . When this double-tube flam pump is operating normally, that is, when none of the tubes forming the double-tube flam is broken, the tube breakage detecting means does not particularly work.

When the outer tube is damaged due to breakage of the double tube flam during the operation of this double flam pump, hydraulic oil enters the tube chamber. When the hydraulic oil enters, the tube breakage detecting means detects the occurrence of a double tube flam breakage accident. The indication of the occurrence of the breakage accident is performed, for example, by the visual indication means or the audible means when the tube breakage detection means itself is provided with a visual indication means such as an alarm lamp or an audible indication means such as an alarm buzzer. . Further, when the tube breakage detecting means itself does not include the above-mentioned display means, for example, the tube breakage detecting means outputs a detection signal to a visual display means such as an alarm lamp or an audible display means such as an alarm buzzer to operate them. .

When the inner tube is damaged due to breakage of the double-tube flam during the operation of the double-flame pump, the transfer liquid enters the tube chamber. When the transfer liquid enters, the tube breakage detecting means operates as described above.

By operating the tube breakage detecting means in this way, the operator can know that either the outer tube or the inner tube forming the double tube flam is broken. At the stage when this tube breakage detection means operates, either the outer tube or the inner tube forming the double tube flam has not been damaged, so the pump function is maintained. The operator can recognize that a double tube flam needs to be replaced. In other words, it is possible to know when to replace the double tube flam before the accident of total damage to the double tube flam. In addition, the fluid in the pump chamber and the hydraulic oil do not mix with each other.

[0048]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments. It is needless to say that the present invention is not limited to this embodiment, and design changes can be appropriately made within the scope of the gist of the present invention.

(Embodiment 1) FIG. 1 is a partially cutaway sectional view showing the outline of a double tube flam pump according to an embodiment of the present invention.

As shown in FIG. 1, the double tube flam pump 1 has a hydraulic chamber 2, a suction pressing means 3, a double tube flam 4, and a tube breakage detecting means 5.

The hydraulic chamber 2 is formed with an internal space surrounded by an inner peripheral surface that expands from an opening provided at the top and bottom of the pump body 6 toward the central portion. The hydraulic chamber 2 is filled with hydraulic oil.

The double tube flam 4 is arranged in the hydraulic chamber 2 so as to penetrate from the one end opening of the pump body 6 to the other end opening.

The double tube flam 4 has a double structure having an outer tube 4a and an inner tube 4b. Both ends of the outer tube 4a are annular flare portions that are folded back in a brim shape to the outside of the outer tube 4a. The outer tube 4a is inserted and arranged in the hydraulic chamber 2 so that flare portions at both ends thereof are overlapped with the outer edge of the opening of the pump body 6. Both ends of the inner tube 4b are annular flare portions that are folded back in a brim shape to the outside of the inner tube 4b. The inner tube 4b is inserted and arranged inside the outer tube 4a, and one flare portion of the inner tube 4b is overlapped with one flare portion of the outer tube 4a. The inner tube 4b is arranged so that the length of the inner tube 4b in the axial direction is longer than that of the outer tube 4a.
The size of b is set. Therefore, when one flare portion of the inner tube 4b is superposed on one flare portion of the outer tube 4a, the other flare portion of the inner tube 4b is separated from the flare portion of the outer tube 4a. An annular spacer 7a is interposed in the gap between the flare portion of the inner tube 4b and the flare portion of the outer tube 4a. The flare portion of the inner tube 4b and the flare portion of the outer tube 4a with the spacer 7a interposed therebetween are fixed by the fixing member 7. The other flare portion of the inner tube 4b and the other flare portion of the outer tube 4a are in close contact with each other and are fixed by the fixing member 7. By being fixed by the fixing member 7 in this way, a tube chamber formed by the outer peripheral surface of the inner tube 4b and the inner peripheral surface of the outer tube 4a is formed in a liquid-tight manner.

A fluid guide tube 5a which is a part of a tube breakage detecting means 5 which will be described later is connected to the tube chamber of the double tube flam 4.

The inner peripheral surface of the outer tube 4a and the outer peripheral surface of the inner tube 4b are in non-adhesive contact with each other. The outer tube 4a is made of oil resistant rubber such as NB.
The inner tube 4b is made of R, and the inner tube 4b is made of fluororesin. Therefore, the double tube flam 4 is less likely to be deteriorated by the hydraulic fluid filled in the hydraulic chamber 2 and the transfer liquid flowing through the inner space of the inner tube 4b, that is, substantially the pump chamber 8.

The space between the inner peripheral surface of the outer tube 4a and the outer peripheral surface of the inner tube 4b, that is, the tube chamber is filled with incompressible fluid.

A fluid introduction pipe 9 is provided at an opening at one end of the pump body 6 (an opening at the lower end of the pump body 6 in FIG. 1).
Is connected and attached, and the fluid outlet pipe 10 is connected and attached to the other end opening (the upper end opening of the pump body 6 in FIG. 1). When the fluid is introduced from the pump chamber 8 to the fluid outlet pipe 10, the fluid is prevented from flowing back into the fluid inlet pipe 9 and the fluid is pumped from the fluid inlet pipe 9 into the fluid inlet pipe 9. A one-way valve, for example a non-return valve 11, is provided which can allow the flow into the chamber 8. Similarly, when the fluid is led out from the pump chamber 8 to the fluid lead-out pipe 10, the fluid lead-in pipe 9 is introduced from the pump chamber 8 into the fluid lead-out pipe 10.
A one-way valve, such as a check valve 11, is provided which prevents fluid from flowing back into the pump chamber 8 and allows fluid to flow out of the pump chamber 8 into the fluid outlet pipe 10.

The tube breakage detecting means 5 has a fluid guide tube 5a, a check valve 5b, a hydraulic pressure sensor 5c, and an alarm means 5d. One end of the fluid guide tube 5a is inserted into a predetermined space formed by the flare portion (folded portion) of the outer tube 4a and the flare portion (folded portion) of the inner tube 4b, and the other end of the fluid guide tube 5a is When the liquid that has been inserted into the liquid reservoir 5e having the liquid pressure sensor 5c and has entered between the outer tube 4a and the inner tube 4b reaches the predetermined space, the liquid passes through the fluid guide tube 5a. To reach the liquid reservoir 5e. A check valve 5b is provided in the liquid reservoir 5e. An electric signal is output from the hydraulic pressure sensor 5c through a conductor and can be input to the alarm means 5d. Alarm means 5
d has an alarm buzzer 5f and an alarm lamp 5g.

The suction pressing means 3 comprises a cylinder 3a and a piston 3b. The cylinder 3a has a hydraulic chamber 2 so that the opening of the tip thereof opens into the hydraulic chamber 2.
It is placed facing the. The piston 3b is the cylinder 3
It is reciprocally inserted in a. The piston 3b can reciprocate by a driving means (not shown).

The double tube flam pump 1 operates as follows.

Piston 3 inserted in cylinder 3a
It is assumed that the tip of b is located near the tip opening of the cylinder 3a. When the piston 3b is moved backward in the cylinder 3a, hydraulic oil is sucked into the cylinder 3a. The double tube flam 4 expands or expands in accordance with the suction of the hydraulic oil, and the volume in the pump chamber 8 increases. A fluid is introduced from the fluid introducing pipe 9 into the pump chamber 8 due to the increase in the volume of the pump chamber 8. At this time, the check valve 11 prevents the fluid from flowing back from the fluid outlet pipe 10 into the pump chamber 8.

When the rear piston 3b is moved forward after the piston 3b is partitioned, the hydraulic oil in the hydraulic chamber 2 is pressurized and the double tube flam 4 is contracted. The contraction of the double tube flam 4 reduces the volume in the pump chamber 8. As a result, the fluid in the pump chamber 8 becomes
It is discharged to 0. At this time, the action of the check valve 11 in the fluid introducing pipe 9 causes the fluid in the pump chamber 8 to move.
There is no backflow inside.

By repeating the above operation, the piston 3
The volume of the pump chamber 8 is repeatedly increased and decreased in accordance with the reciprocating movement of b, whereby the pump function is exerted.

While the pump function is exerted, the incompressible fluid filled in the tube chamber formed between the outer tube 4a and the inner tube 4b passes through the check valve and the liquid reservoir 5e. Move to. As a result, there is almost no incompressible fluid in this tube chamber.

It is assumed that the outer tube 4a is damaged where the pump function is smoothly exhibited. Then, from the damaged portion of the outer tube 4a to the outer tube 4a.
The hydraulic oil penetrates into the gap between the inner tube 4b and the inner tube 4b. The infiltrated hydraulic oil is discharged to the tube breakage detection means 5 side during the discharge process of the piston 3b, for example, and the check valve 5b prevents backflow from the tube breakage detection means 5 side during the suction process. The tube flam is deformed like driving at time. Alternatively, the infiltrated hydraulic oil reaches a predetermined space formed by the flare portion of the outer tube 4a and the flare portion of the inner tube 4b according to the capillary phenomenon in the gap between the outer tube 4a and the inner tube 4b. The hydraulic oil that has reached the liquid reservoir 5e further passes through the fluid guide pipe 5a and the check valve 5b. This is performed for each discharge process. The hydraulic pressure sensor 5c detects the pressure of the hydraulic oil that has reached the liquid reservoir 5e, and the hydraulic pressure sensor 5c outputs a detection signal to the alarm means 5d. An alarm is issued by the alarm means 5d. From this alarm, the operator can judge that either the outer tube 4a or the inner tube 4b of the double tube flam 4 is damaged, and can expect that the tube which is not damaged will also be damaged in the near future. . Therefore, double tube flam 4
Will be exchanged.

On the other hand, it is assumed that the inner tube 4b is damaged where the pump function is smoothly exhibited.
Then, the fluid in the pump chamber 8 permeates into the gap between the outer tube 4a and the inner tube 4b from the damaged portion of the inner tube 4b. The infiltrated fluid is discharged to the tube breakage detection means 5 side during the discharge process by the piston 3b, for example, and the check valve 5b prevents backflow from the tube breakage detection means 5 side during the suction process. When the tube flam is deformed as in the case of operation, or in accordance with the capillary phenomenon in the gap between the outer tube 4a and the inner tube 4b, a predetermined space is formed between the folded portion of the outer tube 4a and the folded portion of the inner tube 4b. To reach. The reached fluid further reaches the liquid reservoir 5e through the fluid guide tube 5a. This is performed for each discharge process. The fluid pressure sensor 5c detects the pressure of the fluid that has reached the fluid reservoir 5e, and the fluid pressure sensor 5c outputs a detection signal to the alarm means 5d. An alarm is issued by the alarm means 5d. From this alarm, the operator can judge that either the outer tube 4a or the inner tube 4b of the double tube flam 4 has been damaged, and can expect that the tube which is not damaged will also be damaged in the near future. Therefore, the replacement of the double tube flam 4 is executed.

According to the double tube flam pump 1 of this embodiment, the working oil and the fluid are not mixed due to the damage of the tube flam. Therefore, due to the breakage accident of the tube flam, the passage through which the fluid is circulated is contaminated with the hydraulic oil, and it is possible to eliminate the complicated work of cleaning the entire passage of the contaminated fluid. Moreover, since the double tube flam pump 1 only stacks the outer tube 4a and the inner tube 4b to the extent that the inner surface of the outer tube 4a and the outer surface of the inner tube 4b are in a non-adhesive state, The structure of the flam pump itself is very simple. That is, the double tube flam pump 1 according to this embodiment has a very simple structure.

In this embodiment, the outer tube 4a
Is made of oil-resistant rubber and the inner tube 4b is made of fluororesin, so that even if the outer tube 4a and the inner tube 4b are integrally molded, both tubes do not adhere to each other. Therefore, the double tube flam 4 formed of such a material is easy to manufacture.

The double tube flam used in this embodiment is manufactured by integrally molding the outer tube and the inner tube. In this case, the material of the inner tube is a flexible and chemically resistant fluororesin, and the material of the outer tube is NBR which is an oil resistant elastomer.

That is, as shown in FIG. 2, a cylindrical inner tube 4b is molded using a fluororesin. Flares 4c flaring outward are formed on both ends of the inner tube 4b. A taper surface 4d is formed from the flare portion 4c formed on one end side to the end portion of the body portion of the inner tube 4b so as to go around the body portion. The tapered portion 4d is provided with a plurality of protruding portions 4e formed along the center line of the inner tube 4b. No particular tapered surface is provided between the flare portion 4c formed on the other end side and the other end portion of the body portion of the inner tube 4b.

The inner tube 4b is placed in a mold for producing a double tube flam. At this time, a core of the same shape is inserted in the inner cylindrical space of the inner tube 4b. In the mold, the NB is in a molten state that can be flowed by heating between the outer peripheral surface of the inner tube 4b and the inner wall surface of the mold.
Inject R. After cooling for a predetermined time after injection,
The double tube flam can be obtained by removing the mold. In this case, the NBR is press-molded at a temperature of about 180 ° C., but at this temperature, the fluororesin does not cause deformation that would cause a problem in the function of the double tube flam, so that the NBR can be pressure-molded well. To be done. Moreover, since the fluororesin has good releasability, N
Inner tube 4 even if it may come into close contact with the BR
There is no adhesion between b and the outer tube 4a.

In this manufacturing method, the length of the outer tube 4a (the length along the axial direction) formed by the integral molding is more than the length of the inner tube 4b (the length along the axial direction). Shorten so that the flare portion 4c at the end of the inner tube 4b and the flare portion 4f at one end of the outer tube 4a overlap, and thus the flare portion 4c at the end where the tapered surface 4d of the inner tube 4b is not formed and the outer side. The inner tube 4b and the outer tube 4a are integrally formed by the above manufacturing method so that the flare portion 4g at the other end of the tube 4a is separated.

Thus, the tapered surface 4d is formed on the outer peripheral surface of the inner tube 4b on the one end side, and the materials of the inner tube 4b and the outer tube 4a are different as described above. The inner tube 4b, which is in close contact with the outer tube 4a, can be easily pulled out from the end portion side having the tapered surface 4d, and by pulling it out, as shown in FIG. The flare portion 4c of the end portion having the edge and the flare portion 4f of the outer tube 4a are separated from each other to form a space capable of accommodating a spacer as described later. Further, the linear protrusion 4e forms a linear groove 4h on the inner peripheral surface of the end portion of the outer tube 4a. This groove 4h is provided for removing either the working oil or the transfer liquid that has penetrated into the gap between the inner tube 4b and the outer tube 4a when either the inner tube 4b or the outer tube 4a is damaged during the operation of the double tube flam pump. Advantageously, the function of guiding the tube breakage detecting means can be exhibited.

In the manufacturing method by this integral molding, when pulling out the inner tube 4b from the outer tube 4a, an adhesive agent or the like is applied to the flare portion 4c of the inner tube 4b (flare portion at the end where the tapered surface is not formed). Once applied, the inner tube 4b is pulled out, so that the flare portion 4c coated with the adhesive and the outer tube 4a
A double tube flam is obtained by adhering the flare portion 4g to the inner tube 4b and hermetically sealing one end of the outer tube 4a.

(Embodiment 2) A major difference of the double tube flam pump according to the second embodiment from the double tube flam pump according to the first embodiment is the double tube flam.

That is, as shown in FIG. 4, the double tube flam 4 according to the second embodiment includes an inner tube flam 4B made of fluororesin and an elastomer such as N.
The outer tube 4A made of BR, and the inner tube flam 4B has a flare portion at one end opening portion thereof, has no flare portion at the other end opening portion, and extends from the other end opening portion toward the central portion. It is formed to have a wall thickness over the entire circumference up to a predetermined length. The outer tube 4A has flare portions formed at both end openings. This double tube flam 4
It is manufactured as follows. That is, the outer tube 4A and the inner tube 4B are formed separately, the inner end of the flare portion of the inner tube 4B is inserted from the one end opening of the outer tube 4A, and the flare portion of the outer tube 4A and the flare portion of the inner tube 4B are inserted. It overlaps with the part. In addition,
The flare portion of the outer tube 4A and the flare portion of the inner tube 4B may be simply overlapped with each other, but it is preferable to integrally join them by an adhesive means such as an adhesive or a fusion means.

The tube flam 4 having a shape different from that of the tube flam in the first embodiment is incorporated in the double tube flam pump 1 as follows.

That is, the double tube flam 4 is inserted through the opening provided in the lower portion of the pump body 6, and the flare portions of the outer tube 4A and the inner tube 4B are connected to the edge portion of the opening portion of the pump body 6 and the fluid introduction. It is sandwiched and fixed by the first fixing member 7a having a mouth. The fluid introducing pipe 9 is attached to the first fixing member 7a.

The other flare portion of the outer tube 4A is sandwiched and fixed by a second fixing member 7b having a circular opening portion and the end edge portion of the opening portion provided on the upper portion of the pump body 6. The inner end opening of the flare portion of the inner tube 4B is inserted through the circular opening of the second fixing member 7b. The tubular portion of the adapter 7c is inserted into the thick portion of the inner tube 4B, and the annular seal ring 7d and the annular pressing ring 7e are interposed on the outer periphery of the thick portion, so that the inner tube 4B
The end portion of is fixed by the adapter 7c and the third fixing member 7f.

The fluid outlet pipe 10 is attached to the third fixing member 7f.

The other mechanical structures described above are the same as those in the first embodiment.

The double-tube flam pump 1 according to the second embodiment is different from the dull tube-flame pump according to the first embodiment in the structure or shape of the double-tube flam 4, but the operational effects are almost the same. is there. Further, the working effects of the tube flam pump 1 itself are substantially the same as the working effects of the double tube flam pump according to the first embodiment.

[0083]

According to the present invention, a double tube diaphragm pump capable of sucking and discharging a solid-liquid mixed-phase flow, which was difficult to suck and discharge with a diaphragm tube pump, without causing sedimentation and separation of solid components. Can be provided.

According to the present invention, it is possible to provide the double tube flam pump capable of detecting the breakage of the tube.

According to the present invention, it is possible to provide a double tube flam pump capable of detecting the necessity of tube replacement before the tube is totally damaged.

According to the present invention, there is provided a double tube flam pump capable of preventing the occurrence of a complete tube breakage accident in which hydraulic fluid and pump fluid (transfer liquid) are mixed. be able to.

According to the present invention, it is possible to provide a double tube flam suitable for a double tube flam pump.

According to the present invention, even if flare portions exist at both ends of the inner tube and the outer tube, the inner tube is placed inside the outer tube, and the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube are not adhered. It is possible to provide a double tube flam that is accommodated so as to be contactable in the state.

According to the present invention, it is possible to provide a method capable of suitably and easily manufacturing the double tube flam.

[Brief description of the drawings]

FIG. 1 is a partially cutaway schematic view showing an example of a double tube flam pump of the present invention.

FIG. 2 is an explanatory cross-sectional view showing an example of the double tube flam of the present invention and showing a state after integral molding.

FIG. 3 is a cross-sectional explanatory view showing an example of the double-tube flam of the present invention and showing a state immediately before being attached to the double-tube flam pump.

FIG. 4 is a partially cutaway schematic view showing another example of the double tube flam pump of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Double tube flam pump, 2 ... Hydraulic chamber, 3 ... Suction pressing means, 3a ... Cylinder, 3
b ... piston, 4 ... double tube flam, 4
a, 4A ... outer tube, 4b, 4B ... inner tube, 4c ... flare part, 4d ... taper part, 4
e ... Projection, 4f, 4g ... Flare, 4h ...
・ Groove, 5 ... Tube breakage detection means, 5a ... Fluid guide tube, 5b ... Check valve, 5c ... Fluid pressure sensor,
5d ... Alarm means, 5e ... Liquid reservoir, 5f ...
Alarm buzzer, 5g ... Alarm lamp, 6 ... Pump body, 7 ... Fixing member, 7a ... First fixing member, 7b
... Second fixing member, 7c ... Adapter, 7d ...
Seal ring, 7e ... Pressing ring, 7f ... Third fixing member, 8 ... Pump chamber, 9 ... Fluid introducing pipe,
10 ... Fluid outlet pipe, 11 ... Check valve.

Claims (8)

[Claims] 1. A hydraulic chamber for containing hydraulic oil, a suction pressing unit, a pump chamber, and a tube breakage detecting unit, wherein the suction pressing unit includes a cylinder and a piston.
The inside of the front end of the cylinder forms a part of the hydraulic chamber, and the piston reciprocates to cause a partial volume change inside the front end of the cylinder so as to suck and press the working oil in the hydraulic chamber. The pump chamber is formed so as to penetrate the hydraulic chamber, and is formed by a double tube flam formed by stacking a plurality of flexible tubes in a non-adhesive state with each other, and the tube breakage detection means is A double tube flam pump comprising a detector for detecting a change in state between flexible tubes. 2. The double tube flam according to claim 1, wherein a mutual gap between a plurality of flexible tubes forming the double tube flam is maintained in a reduced pressure state, and the detector is a pressure detector. Fram pump. 3. The double-tube flam has a plurality of flexible tubes forming the double-tube flam filled with an incompressible fluid in a mutual gap, and the tube breakage detection means includes the flexible tube and the detector. The double-tube flam pump according to claim 1, further comprising a flow path having a check valve in the middle thereof, the detector being a pressure detector. 4. The double-tube flam has a flexible tube of an outermost layer formed of an oil resistant elastomer and a flexible tube of an innermost layer formed of a chemical resistant synthetic resin to form a double tube flam. The flexible tube has a flare portion at its end, and is formed by filling the oil-resistant elastomer into a mold in which a tube that can be the flexible tube of the innermost layer is placed and integrally molding the same. Item 4. The double tube flam pump according to any one of Items 1 to 3. 5. The double-tube flam is characterized in that the outermost flexible tube is made of an oil-resistant elastomer and the innermost flexible tube is made of a chemical-resistant synthetic resin or an elastomer. The flexible tube of the innermost layer formed separately from the flexible tube of the outermost layer is inserted into the flexible tube, and the incompressible fluid is loaded between the flexible tubes formed. The double tube flam pump according to any one of claims 1 to 3. 6. The double tube according to any one of claims 1 to 5, wherein one end or both ends of the outermost flexible tube and the innermost flexible tube are airtightly joined to each other in the double tube flam. Fram pump. 7. An inner flexible tube having flare portions at both ends and formed of a chemical resistant synthetic resin, and flare portions at both ends, and a non-adhesive state with an outer peripheral surface of the inner flexible tube. A double-tube flam having an outer flexible tube formed of an oil-resistant elastomer, the double-tube flam having an inner peripheral surface in contact with the outer tube. 8. An outer flexible tube in which an inner flexible tube made of a chemical resistant synthetic resin is placed in a mold, and an oil resistant elastomer is injected into the outer peripheral surface side of the inner flexible tube in the mold. The method for producing a double tube flam according to claim 7, wherein the method is heat molding.