JP6152936B2 - Viscous fluid dispenser - Google Patents

Description

  The present invention relates to a discharger for discharging a viscous fluid such as a sealing material or an adhesive.

As this type of discharger, a piston is slidably provided in the cylinder, a push rod is provided on the piston, and the piston is pushed through the push rod to discharge the viscous fluid in the cylinder from the ejection nozzle. What was made is known conventionally.
The piston is provided with a sealing member that performs a sealing function with the cylinder so that the viscous fluid does not leak to the push rod side when a discharge pressure acts on the viscous fluid in the cylinder.

JP 2004-195458 A

Many of the conventional dispensers as described above have a low roundness of the cylinder. A low roundness of Cylinders, since gap is formed between the piston, when the discharge pressure to the viscous fluid in the cylinder is applied, a problem that the discharge fluid from leaking to the push rod side there were.
An object of the present invention is to provide a viscous fluid discharger that does not impair the sealing function even when the roundness of a cylinder is low.

First invention comprises a cylinder, a slidably embedded Mareta piston in this cylinder,
A jet nozzle provided on a side opposite to the piston, provided on one side of the piston facing the ejection nozzle, the sliding piece around the surface opposite to the ejection nozzle is provided a disc-shaped seal When the snaps Murrell disk-like elastic plate is provided in the sliding piece inside of the disc-shaped seal. In the elastic plate, a plurality of radially extending slits are formed at equal intervals in the circumferential direction, and the elastic plate pressed between the slits as an elastic piece portion is inserted into the sliding piece. deflection from the central portion, in contact with the tip of the elastic piece portions adjacent to each other, and the structure for pressing the outer upward Kisurido piece.

In the first aspect of the invention, the outer periphery of the elastic plate is pressed against the inner periphery of the sliding piece provided on the disc-shaped seal, so that the sliding piece is pressed against the inner surface of the cylinder by the elasticity of the elastic plate. In this way, if the sliding piece is pressed against the inner surface of the cylinder by the elastic force of the elastic plate, the sliding piece will always follow the inner surface of the cylinder even if the roundness of the cylinder is low. The sealing function of the cylindrical seal is not impaired .

In particular , since the elastic plate is formed in a disk shape and a plurality of slits extending radially are formed and the space between the slits is an elastic piece portion, these elastic piece portions can be bent independently. Since each elastic piece can be bent independently in this way, even if the roundness and flatness of the inner surface of the cylinder are low, the sliding piece of the disc-shaped seal can follow the inner surface of the cylinder. Regardless of the accuracy of the inner surface, the sealing function can be reliably exhibited.

Further, when the elastic plate is incorporated into the disk-shaped seal and bent, the tips of the elastic pieces adjacent to each other come into contact with each other, so that the elastic pieces are all pressed against each other in the circumferential direction of the sliding piece of the disk-shaped seal. To do. As described above, since all of the elastic piece portions are in pressure contact with each other in the circumferential direction of the sliding piece, the sliding piece does not come into contact with the inner surface of the cylinder and the sealing function becomes uniform. Therefore, even if the discharge pressure acts on the viscous fluid in the cylinder, it does not leak out.

FIG. 1 is a sectional view. FIG. 2 is a cross-sectional view of a disk-shaped seal incorporating an elastic plate. FIG. 3 is a plan view of the elastic plate. 4 is a plan view of FIG .

  In the illustrated embodiment, the cylinder C is continuously provided with a rod storage portion 1 having a smaller diameter than that of the cylinder C. A slider 3 provided with a handle 2 is slidably incorporated in the rod storage portion 1, and the handle 2 protrudes outward from the rod storage portion 1. Further, a long groove 4 extending in the longitudinal direction is formed with respect to the rod storage portion 1 so that the handle 2 can be moved along the long groove 4. By moving the handle 2 in this way, the slider 3 moves in the rod storage portion 1.

One end of a push rod 5 is fixed to the slider 3, and a piston P that slides in the cylinder C is fixed to the tip of the push rod 5. The piston P includes a fixing member 6 provided at the tip of the push rod 5 and a piston member 7 in close contact with the fixing member 6.
The fixing member 6 forms a tubular portion 6a at the center thereof, are inserted up Sshuroddo 5 to the cylindrical portion 6a. Further, a disc portion 6 b is formed on the cylindrical portion 6 a of the fixing member 6, and the disc portion 6 b is brought into close contact with the piston member 7.

  The piston member 7 that is in close contact with the disc portion 6b is made of an elastic resin or synthetic rubber, and a concave portion 7a in which the disc portion 6b fits snugly is formed on the surface facing the disc portion 6b. ing. Further, an upright piece 7b is formed around the recess 7a, and the tip of the upright piece 7b is in contact with the inner surface of the cylinder C. In the figure, reference numeral 7c denotes a rod through hole through which the push rod 5 passes.

  A disk-shaped seal 8 made of resin or synthetic rubber is provided on the back surface of the piston member 7 as described above, that is, on the surface opposite to the concave portion 7a. This disk-shaped seal 8 has the same shape as the piston member 7, and the back surfaces thereof are overlapped. Thus, the disk-shaped seal 8 has the same shape as the piston member 7. The shape of the disk-shaped seal 8 will be described in more detail with reference to FIG.

The disc-shaped seal 8 has a concave portion 8b formed with a rod through hole 8a in the center on the surface opposite to the mating surface with the piston member 7.
A sliding piece 8c is erected around the concave portion 8b, and a tapered surface 8d having a smaller diameter toward the bottom surface of the concave portion 8b is formed on the inner surface of the sliding piece 8c.
The disc-shaped seal 8 configured as described above is configured such that when it is attached to the push rod 5, the tip of the sliding piece 8c comes into contact with the inner surface of the cylinder C to exert a sealing function.

  An elastic plate 9 is fitted inside the sliding piece 8c of the disc-shaped seal 8, and this elastic plate 9 has an outer diameter smaller than the maximum diameter portion of the tapered surface 8d, while the outermost diameter of the tapered surface 8d. It is larger than the small diameter part. As is clear from FIG. 3, the elastic plate 9 is formed with a plurality of slits 9a extending radially outwardly at equal intervals in the circumferential direction, and between the slits 9a, an elastic piece 9b. It is said.

  The elastic plate 9 as described above is incorporated by being pushed into the inside of the sliding piece 8c. At this time, the elastic plate 9 is bent and bent from its central portion as shown in FIG. When the elastic plate 9 is bent from the central portion, as shown in FIG. 4, the tip portions of the elastic piece portions 9b adjacent to each other are brought into close contact with each other while narrowing the interval between the slits 9a. However, the elastic piece portions 9b may be closely abutted or may overlap each other.

When assembling the piston P and disc-like seal 8 as described above in the push rod 5, first, the through push rod 5 to the coil spring 10, the cylindrical portion 6a provided on the fixed member 6 of the piston P of the push rod 5 Insert the tip. As a result, the coil spring 10 is incorporated between the fixing member 6 and the slider 3.

When the fixing member 6 is attached as described above, the tip of the push rod 5 is passed through the rod through holes 7c and 8a of the piston member 7 and the disk-shaped seal 8, and the elastic plate 9 is inserted into the sliding piece 8c of the disk-shaped seal 8. Is incorporated.
In the above state, the tip of the push rod 5 protrudes from the disc-shaped seal 9 incorporating the elastic plate 9, and a pressing plate 11 is attached to the protruding end so that it is firmly held by the cap nut 12. Yes. The outer diameter of the pressing plate 11 is made smaller than the minimum diameter portion of the tapered surface 8d so that the pressing plate 11 is accommodated in the recess 8b of the disk-shaped seal 8 .

Therefore, when the cap nut 12 is tightened and the elastic plate 9 is pressed by the pressing plate 11, the elastic plate 9 is bent as shown in FIG.
When the elastic plate 9 is bent as described above, the elastic force acts on the sliding piece 8c of the disc-shaped seal 8 as a force for pushing it outward. The sliding piece 8c comes into close contact with the inner surface of the piston P.

  When the sliding piece 8c is in close contact with the inner surface of the piston P, the sealing function is exhibited. As described above, the elastic piece portion 9b of the elastic plate 9 is opposed to the other elastic piece portion 9b via the slit 9a. Therefore, even if the roundness of the cylinder C is low, the sealing function is not impaired. This is because each independent elastic piece 7b can follow the inner surface shape of the cylinder C. Even if the roundness changes during the movement of the piston P, the independent elastic piece 9b partially pushes open the sliding piece 8c to cope with the change in roundness for each elastic piece 9b. As a result, the sealing function of the disc-shaped seal 8 is not impaired.

  On the other hand, an ejection nozzle 13 is provided at the tip of the cylinder C, and an open / close valve mechanism 14 is provided in a passage process connecting the inside of the cylinder C and the ejection nozzle 13. The open / close valve mechanism 14 is kept closed when the lever 15 is maintained in the state shown in FIG. 1, but by rotating the lever 15 clockwise in FIG. 1, a valve portion (not shown) connected to the pin 16 is provided. The valve is lifted and opened.

Next, an operation for filling the cylinder C with a viscous fluid and ejecting the fluid from the ejection nozzle 13 will be described.
If the cylinder C is fully filled with the viscous fluid, the slider 3 maintains the state shown in FIG. 1, and the coil spring 10 maintains the maximum extension state.
From this state, when the opening / closing valve mechanism 14 is opened and the handle 2 is grasped and the slider 3 is moved in the direction in which the coil spring 10 is compressed, the piston P moves accordingly. Therefore, a pressure corresponding to the spring force of the coil spring 10 is generated in the viscous fluid. This pressure eventually becomes the discharge pressure from the ejection nozzle 13, but the coil spring 10 exhibits the function of stabilizing this discharge pressure.

  The pressure of the viscous fluid acts on the piston P and the disc-shaped seal 8, and acts on the disc-shaped seal 8 as a force in a direction to open the sliding piece 8c outward. Therefore, the force in the opening direction becomes an element that exerts the sealing function. If the elastic plate 9 is not provided, when the pressure of the viscous fluid is increased, the sealing force of the sliding piece 8c is lost to the pressure. The viscous fluid leaks out to the rod storage unit 1 side. Since the long groove 4 is formed in the rod storage portion 1 as described above, the leaked viscous fluid adheres around the handle 2. For this reason, the hand holding the handle 2 becomes sticky, which hinders work.

  However, in this embodiment, the elastic plate 9 is fitted into the disc-shaped seal 8 and the elastic force of the elastic plate 9 is applied to the sliding piece 8c of the disc-shaped seal 8, so that the pressure of the viscous fluid is as described above. Even if it becomes high, the sealing function of the disk-shaped seal 8 is not impaired. In addition, in the state where the elastic plate 9 is incorporated in the disc-shaped seal 8, the tips of the adjacent elastic piece portions 9b defined by the slits 9a are in contact with each other, so that the entire circumference of the sliding piece 8c is pressed. . Therefore, the sliding piece 8c is pressed evenly against the inner surface of the cylinder C, and the sealing force is equally applied accordingly.

Further, since the elastic piece 9b of the elastic plate 9 is kept independent to some extent by the slit 9a, even if the roundness of the cylinder C is low, the independent elastic piece 9 follows and is viscous. Fluid leakage can be prevented.
Then, when the handle 2 is held and the piston P is moved, the viscous fluid in the cylinder C is ejected from the ejection nozzle 13.

  It is optimal as a discharger for discharging viscous fluids such as sealing materials and adhesives.

C cylinder P piston 8 disc-shaped seal 8c sliding piece 9 elastic plate 9a slit 9b elastic piece part

Claims (1)

A cylinder ,
And slidably embedded Mareta piston in this cylinder,
A jet nozzle provided on a side opposite to the piston,
Provided on one side of the piston facing the ejection nozzle, a disc-shaped seal sliding pieces around the surface opposite to the ejection nozzle is provided,
The sliding piece inside of the disc-shaped seal and snaps Murrell disc-shaped elastic plate provided,
In the elastic plate, a plurality of radially extending slits are formed at equal intervals in the circumferential direction, and between these slits is an elastic piece portion,
The elastic plate is pushed inside said sliding piece, the deflection from the center portion, in contact with the tip of the elastic piece portions adjacent to each other and to the structure for pressing the outer upward Kisurido piece viscosity Fluid dispenser.

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