JP2006103704A - Pipe joint of vacuum line in vacuum packaging machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint of a vacuum line in a vacuum packaging machine capable of solving a problem that the internal capacity of a hose is large, the air suction efficiency is degraded, and oxygen molecules adhered to the inside of a pipe line are hardly eliminated in a forced manner since the hose is shrunk according to the differential pressure while a rotary valve around the rotary vacuum packaging machine is connected to a pressure-proof chamber around the rotary valve via the hose, and the vertical opening/closing motion of each lid is facilitated by utilizing the deflection characteristic of the hose. <P>SOLUTION: A hard outer pipe 33 connected to one end of a straight pipe 26 with the other end connected to a rotary valve overlaps a hard inner pipe 34 fixed to a lid 12 of a pressure-proof chamber in an expandable manner to reduce the pipe capacity. The pipe line is expandable corresponding to the opening/closing operation of the pressure-proof chamber. When vacuum is applied into the straight pipe 26 by a vacuum pump 70, a rubber-made double seal wall 40 having a U-shaped section arranged in a space 35 formed between both pipes prevents air leakage. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pressure-resistant chamber for packaging in a rotary vacuum packaging machine, and a pipe joint for applying a vacuum to the pressure-resistant chamber.

  In the vertical axis rotor type vacuum packaging machine, while revolving a large number of surface plates at equal intervals in a circular orbit centered on the vertical axis, a lid material is arranged on the upper area of each surface plate, There are some which constitute a predetermined number of pressure-resistant chambers at equal intervals. That is, each of the pressure-resistant chambers forms a vacuum environment around the opened package disposed inside during one revolution of the circular track, and after sealing the bag mouth of the package, At the same time as opening, the completely sealed vacuum package is sequentially removed from the chamber.

  Therefore, the rotary valve arranged at the center of the circular track and the periphery of the rotary valve, that is, the lid of the circular track, are connected by a hose, and the bending characteristics of the hose are utilized. The vertical opening and closing movement is facilitated, but if the hose is arranged in a parabolic shape so that it can be bent, the internal volume of the hose increases and the air suction efficiency decreases, and the elastic hose has a differential pressure. When this occurs, there is a disadvantage that it is difficult to forcibly exclude oxygen molecules adhering to the pipe because it contracts in accordance with the differential pressure.

JP 63-02005 A

  In the present invention, a pressure-resistant chamber is formed by a large number of surface plates and lid members that revolve at equal intervals around a circular orbit around the vertical axis rotary valve, and the arms that support the lid members are pivotally supported on the rotor by support pins. At the same time, a vacuum packaging machine of the type in which the lid is opened on the surface plate with the support pin as a fulcrum, and an L-shaped pipe is formed on the side surface of the branch pot protruding from each switching port of the rotary valve. While supporting the open end so as to rotate up and down toward the lid member, the straight pipe protruding from the lid member and the open end of the L-shaped tube overlap with each other in a stretchable manner, and in the gap between the overlaps. The above-mentioned drawbacks are eliminated by installing a rubber double seal wall having a U-shaped cross section.

  In the rotary vacuum packaging machine partially shown in FIG. 2, the end of the arm 13 protruding from the cover 12 is supported by the rotor 11 supported by the main bearing 10 via the pin 14 and slidably supported by the auxiliary bearing 15. The rod 16 that receives the bulging resistance of the rail 17 due to the rotation of the rotor 11 moves the arm 13 and the lid member 12 up and down around the pin 14.

  The rotor 11 formed by a gear conveys a surface plate 19 supported at equal intervals to the endless chain 18 along an endless track, and the surface plates 19 and the lid members 12 are sequentially overlapped on the periphery of the rotor 11. Thus, the pressure resistant chamber 20 is formed.

  The two suction pipes 21 and 22 connected to the two vacuum pumps are connected to the upper fixed plate 24 of the rotary valve 23. In the case of a packaging machine provided with eight pressure chambers 20, the rotary plate 25 has the same number of ports. Are connected like a lotus hole, and the eight ports in the rotating plate 25 are connected to the respective lid members 12 through rigid straight pipes 26, respectively. As a result, by switching the rotary valve 23, the vacuum pressure and the atmospheric pressure are alternately applied to the respective pressure-resistant chambers 20 in a predetermined region.

  The push-up action of the rod 16 causes the ring packing 31 as shown in FIG. 3 to be added to the branch pot 30 that hangs down from the eight ports in the rotating disk 25 as compared with the turning radius of the cover member 12 that rotates upward about the pin 14. The rotation radius of the rigid L-shaped pipe 26 supported through the center line 39 is larger, and the pressure tube 20 is normally rotated regardless of the error of the rotation radius. The part is telescopic as follows.

  That is, as shown in FIG. 1, the outer tube 33 connected to the end of the straight tube 26 and the inner tube 34 fixed to the lid member 12 overlap, and a cross section is formed in a gap 35 formed between the two tubes. A U-shaped rubber double sealing wall 40 (see FIG. 4) is installed, and one end of the sealing wall 40 is fixed to the inner pipe 34 with a band 36, while the other end of the sealing wall 40 is fixed to the inner pipe 34. The end of the outer tube 33 is airtightly fixed with a screw 37. When a vacuum is applied to the straight pipe 26 by the vacuum pump 70 via the rotary valve 23, the double seal wall 40 prevents air leakage to the straight pipe 26.

  As shown in FIG. 5, when the pressure chamber is opened away from the platen by the above-described rotational movement of the lid member 12, the inner tube 34 is pushed into the outer tube 33 and contracts. In this case, the double seal wall 40 is compressed. Similarly, the length of the airflow contracts to prevent air from flowing into the gap 35.

In FIG. 1, since the air in the gap 35 is excluded from the clearance between the slide partition wall 38 formed at the end of the inner tube 34 and the inner surface of the outer tube 33, the difference generated between the inner and outer sides of the double seal wall 40. There is a concern that the fatigue level of the double seal wall 40 is increased by the pressure.
Therefore, in FIG. 6, many parallel grooves 41 in the axial direction are formed on the peripheral surface of the outer tube 33. As a result, the outer tube 33 is partially bent easily due to the formation of the parallel grooves 41, and the external pressure 42 causes the outer tube 33 to come into close contact with the slide partition wall 38 in the inner tube 34 as shown in FIG. 35 air outflow prevention and expectation to delay the air outflow occur.

  FIG. 8 shows that the slide partition wall 43 formed at the end of the outer tube 33 and the rubber check film 44 are brought into contact with the inner surface of the cylindrical cover wall 45 fixed to the outer surface of the inner tube 34, while In addition, a needle-hole-shaped communication passage 47 is formed between the cover wall 45 and the airtight space 46 in the cover wall 45 so as to achieve a pressure balance between the gap 35 described above and the airtight space 46.

  In FIG. 9, a cover wall 50 formed by a bellows is provided between the outer tube 33 and the inner tube 34 so as to be extendable and contracted, while the airtight space 46 inside the cover wall 50 and the inside of the inner tube 34. A needle hole-shaped communication passage 47 is formed, and as described above, the pressure balance between the gap 35 and the space 46 is achieved.

Cross section of piping overlap Partial side view of vacuum packaging machine A plan view of a part of the rotary valve as seen from below The perspective view which partially cut the double seal wall Cross-sectional view of the piping overlap Cross-sectional view of a piping overlap portion according to another embodiment VII-VII arrow view in the previous figure Cross-sectional view of a piping overlap portion according to another embodiment Cross-sectional view of a piping overlap portion according to another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Rotor 12 ... Cover material 13 ... Arm 14 ... Supporting pin 19 ... Surface plate 20 ... Pressure-resistant chamber 23 ... Rotary valve 26 ... Straight pipe 30 ... Branch pot 33 ... Outer pipe 34 ... Inner pipe 35 ... Gap 40 of an overlap part ... Double seal wall 41 ... Parallel groove 45 ... Cylinder cover wall 47 ... Communication path 50 ... Bellows cover wall

Claims (5)

  A pressure chamber is formed by a large number of surface plates and lid members revolving at equal intervals around the circular orbit around the vertical axis rotary valve, and the arms supporting the lid members are pivotally supported by a support pin on the rotor. A vacuum packaging machine of a type in which each lid is opened on each surface plate with a support pin as a fulcrum, on the side of a branch pot protruding from each switching port of the rotary valve, an open end of a rigid L-shaped tube The hard straight tube protruding from the lid material and the open end of the L-shaped tube overlap with each other in a stretchable manner, and the gap between the overlaps. A device with a rubber double seal wall with a U-shaped cross section.   A large number of axially parallel grooves are formed on the peripheral surface of the outer tube in the overlap portion, and the outer tube is connected to the inner tube of the overlap portion by the parallel groove portion contracted by the differential pressure acting on the tube. The apparatus according to claim 1, wherein the apparatus is crimped to the peripheral surface.   The apparatus according to claim 2, wherein a cover wall that covers the air contact side of the double seal wall of the overlap portion is disposed, and a communication passage that connects the inside of the cover wall is formed in the inner wall of the cover wall.   The apparatus according to claim 3, wherein the cover wall is formed by a cylindrical body fixed to the inner tube so as to be slidable with the outer surface of the outer tube. The apparatus according to claim 3, comprising a bellows in which a cover wall is installed in an expandable / contractable state between the outer tube and the inner tube.