JP4861454B2 - piston - Google Patents

Description

  The present invention relates to a piston for use in a subdivision / filling device that fills canned or vacuum-packed bags with soups containing ingredients, or subdivides them into predetermined amounts.

  Traditionally, filling soups with curry, minnesotarone, pork juice, stew, etc. with meat and vegetables mixed in the liquid can be filled into cans, or filled into vacuum packed bags, It was performed in two steps, a step of filling the ingredients and a step of filling the soup. Therefore, there is a problem that the work efficiency does not increase.

  In order to solve such problems, the present applicant has developed a fluid subdivision filling apparatus that can subdivide filling and soup liquid together, and has previously filed a patent application, but this has already been patented. (For example, refer to Patent Document 1).

Japanese Patent No. 3267964

  The above-mentioned conventional metering valve system takes in ingredients and soup from the top of the cylinder body, cuts it out with an inner cylinder (rotary valve) built into the inner diameter of the cylinder, rotates it 180 °, and takes in the opening After having been combined with the opening at the bottom of the cylinder, the soup containing the taken-in ingredients is pushed out with a piston, so that one cup of soup is taken out into a container.

  By pulling the piston built in the inner diameter of the rotary valve from the forward end to a certain position, a space with a cylindrical volume is formed, but the soup drawn into the space can have a constant volume. This is because if the amount of pulling the piston is always constant, the cylindrical space has a constant volume.

  The above device is highly evaluated because it can easily divide the soup with ingredients into a certain volume, but the problem is the problem of fitting the rotary valve (inner cylinder) built into the inner diameter of the cylinder body. It turned out to be.

  That is, if the fitting is loose, centering cannot be performed, and liquid leakage occurs along the circumference of the fitting part. If the fitting is not good, a large torque is required to rotate the rotary valve. It sometimes causes galling. Particularly troublesome is that the work of the day is completed and it is difficult to remove the rotary valve for disassembly and cleaning. In order to eliminate such galling, the surface of the stainless steel must be coated, which causes high costs.

  Moreover, depending on the heat conduction generated when the soup is heated, thermal expansion occurs and the fitting conditions change, which causes a very troublesome problem. That is, the convenience for the operator is deteriorated.

  In order to improve the usability of the operator, the fitting is as loose as possible, and the looseness does not change even if thermal expansion occurs. However, if the fitting is loose, centering cannot be performed, and the soup liquid has a problem that the soup liquid travels down on the circumference and goes down to cause liquid leakage from the lower opening.

  In addition, O-rings are used for conventional general piston seals, but the use of O-rings can ensure axial sealing, but a motor with a drive torque of 15 W for extrusion and retraction is required. Met. Therefore, there is a problem that requires electric energy. In addition, the split ring had to be used because it would not fit into the piston groove unless the packing was extended.

  It is an object of the present invention to provide a piston in which soup liquid is difficult to leak from a fitting portion even if the fitting is loosened, the driving torque for extrusion and retraction is reduced, and the packing can be easily fitted without using a split ring. Objective.

In the invention according to the first aspect of the present invention that meets the above object, the rear end of the piston body that is slidably fitted to a rotatable cylinder is formed to have a slightly small diameter so that the ring packing can be fitted. The ring-shaped packing is formed by fitting an O-ring to a metal ring having a U-shaped cross section, and fitting the ring-shaped opening so that the U-shaped opening faces forward. a piston rod having a ring-shaped packing presser portion from the rear, is screwed before Symbol threaded hole formed in the piston body rear surface, and pressing the ring packing in the ring-shaped packing gland portion, the metal ring by pressing pressure Is slightly protruded from the outer periphery of the piston (claim 1).

Wherein the piston rod rear end, is good to attach the piston cap which is connected to the engine drive system (claim 3).

  According to the present invention, it is possible to obtain an advantage that the soup liquid is difficult to leak from the fitting portion, the driving torque for pushing and pulling is reduced, and the packing can be easily fitted without using a split ring.

It is an exploded sectional view of a subdivision device provided with a piston of the present invention. It is sectional drawing of the state which assembled FIG. It is a disassembled perspective view of the piston of this invention. It is sectional drawing of the packing used for this invention piston (In the figure, the O-ring has shown the state which is not made to fit in a U-shaped part.).

1 Metering valve body 2 Suction port 3 Metering valve body tip opening 4 Front cap 7 Inner cylinder (rotary valve)
8 Piston body 10 Discharge port 11 Through port (opening)
14 Cylindrical Teflon (registered trademark) seal 16 Discharge nozzle 20 Piston shaft (piston rod)
22 Ring-shaped packing 23 Ring-shaped seal retainer 24 Metal ring 25 having a U-shaped cross-section 25 O-ring fitted to the U-shaped portion

Next, embodiments of the present invention will be described with reference to the drawings.

  A front cap (lid body) 4 is fitted and fixed to the distal end opening 3 of the metering valve main body 1. The front cap 4 is provided with a slightly small-diameter disk-like portion 5 that fits tightly in the opening 3 and a small-diameter disk-like portion 6 that further becomes a small-diameter inner cylinder lid. A ring-shaped fitting recess is formed with the inner wall of the valve body 1.

  A tip of an inner cylinder (rotary valve) 7 that is rotatably fitted to the fixed quantity cut-off valve body 1 is rotatably fitted to the ring-shaped fitting recess (small-diameter disk-like part 6). Is fitted to the front opening of the inner cylinder). The ring-shaped fitting concave portion serves as a bearing, and can be centered by doing in this way, so that galling between the stainless steel quantitative cut-off valve body 1 and the inner cylinder 7 can be prevented. A piston body 8 is slidably fitted in the inner cylinder 7. In addition, 9 is an O-ring in the figure, and the tip of the inner cylinder 7 comes into contact with it so that the soup liquid between the inner cylinder and the metering valve main body 1 does not leak.

  A through hole (opening) 11 is formed in the inner cylinder 7, and when the through hole 11 communicates with the suction hole 2 of the quantitative cut-off valve main body 1, the piston main body 8 moves backward and is located in the inner cylinder 7. When a fixed amount of soup containing ingredients is filled and the through-hole 11 of the inner cylinder 7 communicates with the discharge port 10 of the quantitative cut-off valve body 1, the piston body 8 moves forward and enters the ingredient from the communicated discharge port. It is designed to discharge soups.

  The O-ring 12 is fitted into the O-ring groove at the rear portion of the inner cylinder, and the sealing performance between the inner cylinder 7 and the quantitative cut-off valve body 1 is enhanced. Therefore, leakage of soup liquid from this portion is also prevented.

  A cylindrical Teflon (registered trademark) seal 14 having a tip formed on a curved surface 13 that can be in close contact with the inner cylinder (rotary valve) 7 is attached to the discharge port 10 of the metering valve main body 1. (Trademark) The flange 15 at the rear end of the seal 14 is pressed by the front end flange 18 of the discharge nozzle 16 so that the front end of the Teflon (registered trademark) seal 14 is brought into close contact with the inner cylinder 7. Is effectively prevented. The flange 15 of the Teflon (registered trademark) seal is fitted to the short cylindrical body 17 of the outer peripheral threaded portion formed in the outer cylinder, and the tip flange 18 of the discharge nozzle 16 is screwed to the short cylindrical body 17 so that the Teflon ( (Registered trademark) seal 14 is pressed. The opening of the Teflon (registered trademark) seal 14 is larger than the through hole 11 of the cylinder.

  A screw hole 19 is formed in the rear end surface of the piston main body 8, and a piston shaft 20 tip screw portion 21 is screwed into the screw hole 19.

The rear end portion of the piston main body 8 is formed to have a slightly small diameter, and the ring-shaped packing 22 is fitted to the small-diameter portion, and the ring-shaped packing 22 is pressed from behind by a ring-shaped seal presser 23 provided on the piston shaft 20. Thus, the tip of the ring-shaped packing 22 is pressed and held.

  The ring-shaped packing 22 is formed by fitting an O-ring 25 to a U-shaped portion of a metal ring 24 having a U-shaped cross section as shown in FIG. By pressing with the pressing part, it comes out of the piston body slightly. Accordingly, since the metal ring 24 having a U-shaped cross section is always urged in the spreading direction, it effectively prevents leakage of liquid when pushed, and a slight protrusion part collapses and pulls backward smoothly when pulled. It is supposed to be.

  A piston cap 26 connected to the engine drive system is screwed to the rear end of the piston rod.

  According to the above embodiment, since the inner cylinder is always pressed by the cylindrical packing, even if the fitting between the inner cylinder and the metering valve main body is slightly loosened, the liquid is transmitted on the circumference of the inner cylinder. Thus, it is possible to effectively prevent liquid leakage.

  Moreover, according to the said Example, since the inner cylinder is fitted so that it can rotate to the back face of the front cover of the quantitative cut-off valve body, since the centering can be performed, the fitting can be slightly loosened.

Moreover, since the piston of the present invention can be separated into two, the packing can be fitted into the piston groove without using a split ring. Moreover, the use of the U-shaped section of the metal ring was decorated with O- rings, it can be reduced reliably sealed and driving torque.

Claims (2)

The rear end of the piston body that is slidably fitted to a rotatable cylinder is formed to have a slightly smaller diameter so that the ring-shaped packing can be fitted, and the ring-shaped packing is a metal ring having a U-shaped cross section. will by fitting an O- ring, fitted to face front U-shaped opening, a piston rod having a ring-shaped packing presser portion from said ring packing rearwardly fitted, before Symbol piston body A piston that is screwed into a screw hole formed in a rear end face, presses the ring-shaped packing with the ring-shaped packing pressing portion, and causes the metal ring to slightly protrude from the outer periphery of the piston by the pressing. The piston according to claim 1 , wherein a piston cap connected to an engine drive system is attached to a rear end of the piston rod.

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