JP5965460B2 - Plunger pump, manufacturing method thereof, and rubber cylinder for plunger pump - Google Patents

Description

  The present invention relates to a plunger pump and a plunger pump rubber for pressurizing and feeding a fluid used when a ground hardening material is injected into a target ground at a high pressure for the purpose of reinforcing support of the construction foundation ground, stabilizing the ground or stopping water. It relates to cylinders.

  Conventionally, this type of plunger pump is provided with a suction valve and a discharge valve for discharging in a fluid passage, and is provided with a cylinder in which a plunger is slidably housed in a fluid passage between both valves. The suction valve and the discharge valve are alternately opened and closed by the fluctuation of the internal pressure in the cylinder due to the drive, and the fluid in the fluid passage is sucked from the suction valve and discharged from the discharge valve. When it contains a particulate substance such as cement milk, the particles increase the sliding friction between the plunger and the cylinder, causing the plunger to wear quickly, generating frictional heat and overheating the cylinder.

In response to this problem, for example, a plunger pump in which a cylinder and a fluid passage are partitioned by an elastically deformable film body as in the invention described in Patent Document 1 and the plunger side internal space partitioned from the fluid passage is filled with lubricating oil is proposed. Has been. In Patent Document 2, there is also a proposal for isolating the fluid to be pumped from the plunger sliding portion so that they are not in direct contact with each other.

Further, as a measure for increasing the pressure efficiency of the rubber cylinder and the response to the sliding friction of the plunger, the use of a cylindrical elastic body having a constricted shape in which the diameter of the central part is smaller than the diameters of both end parts (Patent Document 3) is filed. Proposed by a person.
JP-A-1-318773 JP-A-64-56975 Japanese Patent No. 3135227

  However, the rubber cylinder made of a cylindrical elastic body having a narrowed central portion in Patent Document 3 has the effect of dramatically increasing the pressure efficiency as compared with the conventional one, but a large number of intense reciprocating slides. There is a problem that the load on the constricted portion is large due to the movement, and the durability of the portion is weak and easily damaged.

  Further, in Patent Document 3, a support body that supports a rubber cylinder in a fluid passage is formed by connecting a conical cone portion at a front end and a disk-shaped pedestal portion at a rear end by a cylindrical state column portion, and the pedestal portion is a pump case. Since the oil is circulated through the oil passage hole, the rear end of the space in the rubber cylinder filled with the oil is closed, so the oil supply / discharge is performed. Has to rely on the oil inlet and outlet provided in the cylinder chamber, which is disadvantageous for the oil circulation, and requires a lot of time and labor to change the oil.

  Further, in Patent Document 3, in order to cope with heat generated by reciprocating sliding of the plunger, the plunger is hollowed to increase the amount of filled oil to radiate heat. However, the oil is less than water. The volumetric efficiency is poor, and when the amount is large, there is a problem that the pressurization efficiency of the pump is lowered.

In other words, water compresses only 1.4% for a pressure of 40 megapascals, but the oil used as the lubricating oil for the plunger pump compresses 6.4%. As a result, only 85% of the actual discharge amount is obtained with respect to the discharge amount.

Conventionally, oil has been filled and injected from the oil injection hole 73 set in the cylinder chamber 4 and discharged only by the oil discharge hole 74. However, as the shape of the filling space becomes more complicated, an appropriate filling pressure is obtained. Therefore, it becomes difficult to inject oil, and it becomes unsuitable for smooth and quick oil discharge, and it is not possible to cope with oil exchange that increases in frequency.

  In order to solve the above-described problems, the present invention is configured such that the shape of the rubber cylinder is a constricted small-diameter portion whose central portion is smaller than the diameters of both end portions, and an annular wall thickness is formed on the outer periphery of the small-diameter portion. A portion is formed, facing a rubber cylinder that expands and contracts by reciprocatingly sliding the plunger, and the fluid sucked from the suction valve by the expansion and contraction of the rubber cylinder is sent out as a high-pressure fluid from the discharge valve.

  In other words, when the inner pressure of the rubber cylinder increases due to the operation of the plunger and the diameter of the constricted small diameter portion expands, the annular thick portion formed in the constricted portion that receives the largest tensile force counteracts the breaking force and becomes thin. The wall thickness was replenished to maintain a strong elastic structure, and the pressure was strengthened by a powerful expansion / contraction operation.

  Also, the plunger that reciprocally slides faces the rubber cylinder that expands and contracts and acts on the filling oil, so that the operation of the plunger does not act directly on the rubber cylinder, thereby protecting the rubber cylinder material and preventing damage. I did it.

  Next, the suppression of heat generation due to the reciprocating sliding of the plunger, which has been conventionally performed by increasing the amount of filled oil by the hollow portion of the plunger, is supported by the oil circulation effect by changing the shape of the rubber cylinder support and pressurizing. The amount of filling oil relative to the fluid was reduced to increase volumetric efficiency and improve the pressurizing effect of the pump.

Further, an oil cup 7 is set on the upper part of the cylinder case 20 via a high-pressure valve 71, and oil is supplied all at once by the oil cup 7. Thus, the high-pressure valve 71 can quickly adjust the injection / discharge.

Since the present invention is configured as described above, the robustness of the rubber cylinder is enhanced and the operating force thereof is enhanced, so that the volumetric efficiency of the fluid is raised and the pressurizing ability of the plunger pump is remarkably enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS The Example of this invention is shown, The longitudinal cross-section side view which made the cross section the principal part which shows the whole structure of the plunger pump by this invention Similarly, it shows the operating status of the reciprocating plunger. (A) is the state where the plunger is at the reference position, (A) is the state where the plunger is at the lower fulcrum, and (C) is the state where the plunger is at the upper fulcrum. Schematic schematic diagram showing Similarly, the perspective view of the rubber cylinder built in the plunger pump by this invention Similarly, the perspective view which shows an example of the support body which covers the rubber cylinder built in the plunger pump by this invention Similarly, a perspective partial enlarged front view in which a principal part of a cover board covering the side belly part of the rear end portion of the space in the rubber cylinder filled with oil of the plunger pump according to the present invention is seen through.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Reference numeral 1 denotes a fluid passage, which sucks and pressurizes fluid supplied to the suction port 11 and discharges it as pressurized fluid from the discharge port 12. A suction valve 13 is opened on the suction side by negative pressure on the suction side, and a discharge valve 14 is opened on the discharge side by increasing the internal pressure. The fluid supplied between the valves is pressurized and pumped. Rubber cylinder 2 is set.

  The rubber cylinder 2 is formed of a cylindrical elastic body having a constricted small-diameter portion 21 whose central portion is smaller than the diameters of both end portions, and an annular thick portion 22 is formed on the outer periphery of the small-diameter portion 21. Is set in the fluid passage 1 by a support body 5 installed at a portion facing the cylinder chamber 4 that houses the plunger 3 across the cylinder.

  The support 5 is provided with a dish-shaped adherend 51 having a plurality of through holes 51a at the bottom at the tip, and a fitting structure with the inner side of the case cover 10 at the base and a hole through the case cover. The cylindrical adherend 52 provided with 52a is connected by a connecting rod 53 whose tip end side is thin and base end side is thick, and the front end side of the rubber cylinder 2 is covered with the adherend 51 and the pump case 10 is formed. The rubber cylinder 2 is inserted into the flank opening 10a and fitted and fixed to the fitting portion 20a formed at the tail end of the cylinder chamber 4, and the tail end side of the rubber cylinder 2 is covered with the adherend 52. The pump case 10 is fixed by being fitted to the inside of the lid 6 of the flank opening 10a.

  The lid 6 of the pump case side abdominal opening 10a is provided with an opening 6b which is joined to a through hole 52a set in the adherend 52 of the support 5 and opened and closed by a cap 6d up and down. The conduction hole 6a is provided, and the cylinder chamber 4, the space between the rubber cylinder 2 and the support 5 and the oil conduction hole 6a of the lid form an oil filling space.

  A cylinder case 20 that accommodates the plunger 3 so as to be slidable in a reciprocating manner is formed on the flank facing the pump case side abdominal opening 10a. Is pressurized and discharged as a high-pressure fluid.

  That is, first, the cap of the upper opening 6a of the lid 6 is removed so that air can escape when oil is injected, and the plunger 3 is moved from the lower fulcrum by the positioning jig P as shown in FIG. / Set the reference position in the cylinder that has come out of 3 strokes, open the high pressure valve, inject oil into the oil filling space, and tighten the cap of the upper opening 6a.

Next, as shown in (a), by moving the plunger 3 to the lower fulcrum, the rubber cylinder 2 is reduced in diameter, a negative pressure is generated in the fluid passage, the suction valve 13 is opened, and the fluid enters the fluid passage 1. Suction. Next, as shown in (c), by moving the plunger 3 to the upper fulcrum, the rubber cylinder 2 expands and expands, the internal pressure in the fluid passage increases to about 40 megapascals, and the discharge valve 14 opens to discharge the fluid. Discharge from the outlet 12.

 At this time, in the rubber cylinder 2, the expansion and contraction operation of the cylindrical elastic body is expanded due to the presence of the constricted small diameter portion 21, and the annular thick portion 22 is formed on the outer periphery of the small diameter portion 21. It counteracts the destructive force of the expansion / contraction operation and supplements the thickness of the thinned diameter portion to maintain a robust elastic structure, and the force is strengthened by the powerful expansion / contraction operation.

  The support 5 is connected by a connecting rod 53 having a narrow distal end side and a thick proximal end side by a connecting rod 53 having a narrow distal end side and a thick proximal end side. The support member 5 has a plurality of through holes 51 a and a through hole to the adherend 52. Since 52a is provided, the filling oil flowing in the rubber cylinder 2 smoothly moves along the outer periphery of the preceding and following through holes and the connecting rod 53, and the rubber cylinder 2 is smoothly expanded and contracted.

  In the second embodiment, the oil cup 7 is set on the upper part of the cylinder case 20 that houses the plunger 3 via the high pressure valve 71, and oil can be supplied to and discharged from the oil filling space through the oil introduction hole 72 that communicates with the cylinder chamber 4. It is what I did.

  Further, the lid 6 of the pump case side abdominal opening 10a is provided with an opening 6b that is joined to a through hole 52a set in the adherend 52 of the support 5 and opened and closed by a cap 6d up and down. Therefore, the normal oil can be easily discharged through the oil conduction hole 6a with the cap 6d removed.

  In this embodiment, an oil cup 7 is set on the upper part of the cylinder case 20 via a high-pressure valve 71, and oil is supplied all at once by the oil cup 7, and the upper and lower openings provided in the lid 6 of the pump case side abdominal opening. In combination with this part, the high-pressure valve 71 can quickly adjust the injection / discharge.

  The plunger pump and the plunger pump rubber cylinder according to the present invention use a cylindrical rubber cylinder as an expansion / contraction elastic body corresponding to a conventional diaphragm or the like, so that the amount of deformation is large, and further, the target fluid and the plunger sliding portion It can be widely applied to fluids containing solid particles such as cement milk, such as the injection of ground hardening material used for soft ground improvement and the construction of water blocking walls, and is highly utilized in the civil engineering industry. It has value.

DESCRIPTION OF SYMBOLS 1 Fluid passage 11 Fluid passage suction port 12 Fluid passage discharge port 13 Suction valve 14 Discharge valve 2 Rubber cylinder 21 Rubber cylinder constricted small-diameter portion 22 Rubber cylinder constricted small-diameter portion annular thick portion 3 Plunger 4 Accommodates plunger Cylinder chamber 5 Rubber cylinder support 51 Adhered body at the front end of the support body 51a Through hole at the bottom of the front end front end adherend body 52 Adhered body at the base end side of the support body 52a Pull out to the case cover side of the base end side adherend. Through hole 53 Connecting rod for connecting the adherends at both ends 6 Lid covering the abdominal opening on the pump case side 6a Oil conducting hole of the lid provided with the upper and lower openings 6b Opening above and below the oil conducting hole of the lid 6a Cap for upper and lower opening of lid body 7 Oil cup for oil supply 71 High pressure valve 72 Oil introduction hole communicating with cylinder chamber 73 Oil injection hole 74 Ile discharge hole 10 Pump case cover 10a Pump case cover side belly opening 20 Cylinder case cover 20a Fitting portion formed at the tail end of the cylinder chamber P Positioning jig

Claims (6)

A fluid passage provided with a discharge valve for discharging a suction valve for sucking the flow body,
And the cylinder case back and forth slidably accommodating the flop plunger,
Central portion medium has a small diameter portion constricted diameter is reduced from the diameter of the both end portions, forming an annular thick portion on the outer periphery of the small diameter portion, a rubber cylinder inflated and deflated by reciprocation of said plunger Let it come,
A plunger pump so as to deliver a high-pressure fluid sucked fluid from the discharge valve from the suction valve by expansion and contraction of La bar cylinder. The flop plunger tip, with leaving a sliding space for the cylinder chamber inner diameter substantially the same diameter of the cylindrical shape, and the cylinder chamber by a cylinder case for accommodating the plunger, so as to fill the oil to the interior space of the subsequent rubber cylinder thereto The plunger pump according to claim 1 . An upper portion of the cylinder chamber flop plunger is reciprocated, together with the provision of the oil cup for supplying and discharging oil to the oil-filled space via a high-pressure valve, for covering the rear end portion of the rubber cylinder space is filled with oil covering The plunger pump according to claim 1 or 2, wherein an oil supply / discharge hole communicating with the oil filling space is provided on the plate .   The rear end portion of the space in the rubber cylinder filled with oil is covered with a cover plate in which an oil passage hole communicating with the space is formed and a supply / discharge port is formed vertically. 3. The plunger pump according to 3.   Cylindrical adherence provided with a dish-shaped adherend having a plurality of through holes at the bottom at the tip, and a fitting structure with the inside of the case cover at the base and a through hole to the case cover It is formed at the end of the cylinder chamber by the cylinder case by covering the fluid cylinder from the case cover side and covering the rubber cylinder to the support body that is connected to the body by a connecting rod with a thin tip side and a thick base end side. A method for manufacturing a plunger pump in which a rubber cylinder is attached by fitting the tip of a support to a fitting portion, and a fluid sucked from a suction valve by expansion and contraction of the rubber cylinder is sent out as a high-pressure fluid from a discharge valve . Constricted central portion medium has a reduced diameter than the diameter of the end portions has a small diameter portion, the sucked fluid from the suction valve from the discharge valve by expansion and contraction of the rubber cylinder forming the annular thick portion on the outer periphery of the small diameter portion Rubber cylinder for plunger pump that delivers high pressure fluid .

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