JP3135928U - Piping connection structure - Google Patents

Abstract

The present invention provides a pipe connection structure that suppresses an increase in the diameter of a pipe connection portion while suppressing the smell of a beverage flowing inside the pipe from adhering to the packing.
A pipe connection structure is a pipe connection structure in which an annular packing 3 is interposed between two cylindrical pipes 2a and 2b to be connected, and the packing is a side surface in contact with the pipe. The flange 21 packing formed on the end portion of the pipe is formed with a fitting projection 34 that protrudes from the side surface of the packing along or in the vicinity of the inner peripheral edge of 33a, 33b. A locking groove 23 that fits into the fitting projection is formed in the connecting surface 22 that comes into contact with the pipe, and the inner diameters of the pipe and the packing are substantially the same.
[Selection] Figure 2

Description

  The present invention relates to a pipe connection structure in which an annular packing is interposed between an end face of one pipe in two pipes to be connected and an end face of the other pipe.

  Pipes through which beverages circulate in a production line for producing beverages such as juice and tea are formed by connecting a plurality of pipes to each other. Since the pipe | tube used for such a drink production line is generally formed, for example with steel materials, such as stainless steel, it is difficult to maintain the watertightness of the connection part of a pipe | tube. Therefore, a connecting structure in which an elastic packing is interposed between the pipes so that the beverage does not leak from the connecting part even if pressure is applied to the inside of the pipe by the beverage flowing in the pipe. It is common to do.

  As the connecting structure as described above, for example, as shown in FIG. 4, an annular packing 103 is interposed between the ends of two pipes 101102 to be connected, and the two pipes 101 and 102 are connected. There is a type in which flanges 104 and 105 respectively extending from the end portion toward the outer peripheral direction are sandwiched and fixed by an annular connector 106 having a substantially U-shaped cross section. The packing 103 is formed with fitting protrusions 109 and 110 projecting from both side surfaces 107 and 108 to be joined to the flanges 104 and 105 so that the cross section has a cross shape, and is formed on the connecting surfaces 111 and 112 of the flanges 104 and 105. Are provided with annularly recessed engagement grooves 113 and 114 into which the fitting protrusions 109 and 110 of the packing 103 are fitted. The fitting protrusions 109 and 110 and the engagement grooves 113 and 114 are located between the outer peripheral side and the inner peripheral side of the both side surfaces 107 and 108 of the packing 103 and the connection surfaces 111 and 112 of the flanges 104 and 105, and are fitted. Flat surfaces are formed on the outer peripheral side and the inner peripheral side from the mating protrusions 109 and 110 and the engaging grooves 113 and 114, respectively. Part of the beverage circulated inside the pipe tries to enter between the packing 103 and the flanges 104 and 105 due to the water pressure. By the above configuration, the fitting protrusions 109 and 110 and the engagement groove Since the part which 113,114 fits exhibits high water-tightness, the drink which distribute | circulates the inside of piping does not leak outside.

  Piping used in the beverage production process is not only used for the production of one type of beverage, but after being used for the production of a certain type of beverage, the piping may be washed and used for the production of another type of beverage. Many. And in order to maintain the watertightness of piping, the synthetic resin which has elasticity is often used for packing, and liquid odor tends to adhere to these synthetic resins. In the case of the piping connection structure described above, the beverage that has entered between the side surfaces 107 and 108 of the packing 103 and the connecting surfaces 111 and 112 of the flanges 104 and 105 can be sufficiently removed simply by flowing the cleaning liquid into the piping. However, when used in the production of another type of beverage, there is a problem that the odor of the beverage used in the immediately preceding production is transferred to another type of beverage. On the other hand, in order to prevent such odor transfer, when the pipe is disassembled and washed every time the type of beverage to be manufactured is changed and then reassembled, there is a problem that the work efficiency is low and the manufacturing cost is high. .

Therefore, as shown in FIG. 5, the width of both side surfaces 202 and 203 of the packing 201 used in the pipe connection structure is made shorter than the width of the connection surfaces 206 and 207 of the flanges 204 and 205, and the inner peripheral surface of the packing 201. An invention has been proposed in which 208 is configured to have a larger diameter than inner peripheral surfaces 211 and 212 of pipes 209 and 210 (for example, Patent Document 1). That is, when the pipes 209 and 210 are connected via the packing 201, the inner peripheral surface 208 of the packing 201 is positioned in the outer peripheral direction with respect to the inner peripheral surfaces 211 and 212 of the pipe, and the inner peripheral surfaces of the pipes 209 and 210 are In this configuration, steps are formed between 211 and 212 and the inner peripheral surface 208 of the packing 201. According to this configuration, the widths of both side surfaces 202 and 203 of the packing 201 joined to the connecting surfaces 206 and 207 of the flanges 204 and 205 are shortened. In other words, since the surface areas of both side surfaces 202 and 203 of the packing 201 are reduced, the odor transfer as described above can be suppressed. Then, when changing the type of beverage to be produced by piping, the beverage that has entered between the side surfaces 202, 203 of the packing 201 and the connecting surfaces 206, 207 of the flange is sufficiently removed by simply flowing the cleaning liquid into the piping. be able to. Therefore, there is no need to disassemble and clean the piping, the beverage manufacturing operation can be made more efficient, and the manufacturing cost can be reduced.
Japanese Patent Laid-Open No. 2003-343776

  However, although it is possible to efficiently use the piping when the beverage manufactured using the piping is changed to another type of beverage by configuring as described above, there are the following problems. . First, since there is a step between the inner peripheral surface of the packing and the inner peripheral surface of the pipe, the flange spreads to the outer peripheral side of the pipe end portion, and the installation space for the pipe increases. Moreover, since the inner peripheral surface of the packing has a step between the inner peripheral surface of the pipe, a part of the beverage that circulates inside the pipe generates turbulent flow at the step portion, and the beverage flows smoothly. I can't.

  The present invention has been made to solve the above-described problems, and suppresses the increase in the diameter of the connecting portion of the pipe while suppressing the smell of the beverage circulating inside the pipe from adhering to the packing. And it aims at providing the connection structure of the piping through which a drink flows smoothly, without generating a turbulent flow.

  In order to achieve the above object, the present invention provides a pipe connecting structure in which an annular packing is interposed between two cylindrical pipes to be connected, each having a flange formed at an end thereof. A fitting projection that protrudes from the side surface of the packing is formed along the inner peripheral edge or in the vicinity of the inner peripheral edge on the side surface of the packing that contacts the tube, and contacts the packing of the tube. The connecting surface is provided with a pipe connecting structure in which a locking groove that fits into the fitting protrusion is formed, and the inner diameters of the pipe and the packing are substantially the same.

  Note that the fact that the fitting protrusion is formed along the inner peripheral edge of the side surface means that the inner diameter of the fitting protrusion and the inner diameter of the tube are substantially the same. The formation of the protrusion means that the inner diameter of the fitting protrusion is slightly larger than the inner diameter of the tube. Specifically, when the fitting protrusion is provided close to the inner peripheral edge of the packing side surface, the distance from the inner periphery of the fitting protrusion to the inner peripheral edge of the packing side surface is from the inner periphery of the fitting protrusion to the packing side surface. The distance to the outer peripheral edge is at least one half or less. More preferably, the distance from the inner periphery of the fitting protrusion to the inner peripheral edge of the packing side surface is equal to or less than a quarter of the distance from the inner periphery of the fitting protrusion to the outer peripheral edge of the packing side surface.

  According to the pipe connection structure according to the present invention, the inner side of the side surface of the packing and the end surface of the pipe hardly forms a flat surface. The width of the side face and the connecting face of the pipe can be shortened. Therefore, the length which protrudes to the outer peripheral side of the flange formed in the edge part of a pipe | tube can be shortened. Thereby, it can suppress that the diameter of the connection part of piping becomes large, and the installation space of piping can be made small. Moreover, the material cost concerning manufacture of a pipe | tube can be reduced by pressing down the protrusion length of the outer peripheral side of a flange in this way.

  In the pipe connection structure according to the present invention, the inner diameters of the two cylindrical pipes to be connected are substantially the same as the inner diameter of the packing interposed between the two pipes. Therefore, it will flow smoothly without being caught at the connecting portion of the beverage flowing in the pipe, and the beverage can be efficiently flowed as compared with the conventional example of FIG. A fitting projection is formed along or near the inner peripheral edge of the side surface of the packing, and a recessed locking groove that fits into the fitting protrusion is formed on the connecting surface of the tube. That is, a flat surface is hardly formed on the side surface of the packing and the inner peripheral side of the connecting surface of the pipe. When the engaging groove and the fitting protrusion are fitted with a high water tightness, when the flat surface is formed large on the packing side surface and the inner peripheral side of the pipe connecting surface as in the conventional example shown in FIG. In comparison, it is possible to prevent the beverage from entering between the packing side surface and the pipe connection surface. Even when a flat surface is formed on the packing side surface and the inner peripheral side of the connecting surface of the tube, the gap between the flat surfaces can be reduced by extremely reducing the width of the flat surface as in the present invention. Beverages that have entered can be easily washed away.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is an exploded perspective view showing a pipe connection structure 1 according to the present embodiment. FIG. 2 is an exploded perspective view of the pipe connection structure of FIG. And FIG. 3 is sectional drawing which shows the connection structure 1 of piping which concerns on this embodiment. The pipe connection structure 1 of the present embodiment includes two pipes 2a and 2b having a flowing water path through which a liquid such as a beverage flows, and an annular packing 3 sandwiched between the two pipes 2a and 2b. And a connecting fitting 4 for sandwiching a flange 21 provided in a bowl shape at the ends of the pipe 2a and the pipe 2b. In addition, in FIG.1 and FIG.2, description of the connection metal fitting 4 is abbreviate | omitted.

  The two pipes 2a and 2b are made of stainless steel, and a flange 21 extending in the end face direction is formed on the outer periphery of the end portions of the two pipes 2a and 2b. The connecting surface 22 that comes into contact with the packing 3 of the two tubes 2a and 2b is provided with a locking groove 23 that is recessed close to the inner peripheral edge. On the other hand, a flat surface 24 perpendicular to the axial direction of the tubes 2a and 2b is formed on the outer peripheral side of the connecting surface 22 of the two tubes 2a and 2b.

  The packing 3 is an annular member made of a synthetic resin excellent in chemical resistance and durability, and has an inner peripheral surface 31 on substantially the same surface as the inner peripheral surface 25 of the tubes 2a and 2b. The outer peripheral surface 32 has a diameter substantially the same as the outer diameter of the connecting surface 22 of 2a and 2b. Then, on the inner peripheral side of both side surfaces 33a and 33b of the packing 3 that abuts the connecting surface 22 of the two pipes 2a and 2b, a fitting that fits into a locking groove 23 formed on the connecting surface 22 of the flange 21 is provided. The mating protrusions 34 are provided close to the inner peripheral edge. Further, a flat surface 35 is formed on the outer peripheral side of the both side surfaces 33a and 33b.

  In the present embodiment, the flat inner side surfaces 36a, 36b, and 26 having a very small width are formed along the inner peripheral edge on the side surfaces 33a and 33b of the packing and the connecting surface 22 of the two tubes 2a and 2b. Each is formed. In addition, by providing a flat surface with a very small width along the inner peripheral edge of the connecting surface 22 of the two side surfaces 33a, 33b and the two tubes 2a, 2b in this way, the tubes 2a, 2b and the packing are provided. 3 has an effect of easily maintaining the state in which the pipes 2a, 2b and the packing 3 are in close contact with each other. However, the technical idea of the present invention is that these inner flat surfaces 36a, 36b, 26 are substantially Even if it is the structure which is not provided in, it is realizable.

  When assembling the pipe connection structure 1, the engaging groove 23 formed on the connection surface 22 of the pipe 2 a and the fitting protrusion 34 formed on the side surface 33 a of the packing 3 are fitted together, and the flat surface 24 of the pipe 2 a The flat surface 35 of the packing 3 is brought into contact. Similarly, the engaging groove 34 formed on the connecting surface 32 of the tube 2b and the fitting protrusion 34 formed on the side surface 33b of the packing 3 are joined, and the flat surface 24 of the tube 2b and the flat surface 35 of the packing 3 Abut. The pipe 2a and the pipe 2b are connected to the packing 3 with the annular coupling fitting 4 having a substantially U-shaped cross section and slightly larger than the outer peripheral surface of the flange 21 with the flange 21 of the pipe 2a and the flange 21 of the pipe 2b interposed therebetween. Tighten and fix with pinching.

  The above-described embodiment is an example, and the embodiment is not limited to the above-described embodiment, and can be changed as appropriate without departing from the scope of the idea of the present invention.

  In the present embodiment, the pipe connection structure used for beverage production is shown, but the present invention is not limited to this. For example, the pipe connection structure used for other liquid production such as a liquid chemical production process is used. Also, the present invention can be applied.

  When the beverage is produced using the pipe having the pipe connection structure 1 as described above, the beverage that has flowed through the pipe flow path is transferred to the inner peripheral surface 25 of the pipes 2 a and 2 b and the inner peripheral surface 31 of the packing 3. Since the diameters are substantially the same, there is no step between the inner peripheral surface 25 of the pipes 2a and 2b and the inner peripheral surface 31 of the packing 3, so that the beverage flow smoothly flows without being caught at the connecting portion. Therefore, the beverage can be efficiently flowed and the odor of the beverage can be prevented from adhering to the packing 3.

  Further, the packing 3 has fitting protrusions 34 along the inner peripheral edges of the side surfaces 33 a and 33 b and is fitted into the locking grooves 23 formed in the flange 21. The portion where the fitting protrusion 34 is fitted and fixed in the locking groove 23 is fixed to the portion where the flat surface 24 of the flange 21 and the flat surface 35 of the packing 3 are in contact with each other. Can be more effectively prevented from entering between the two. Therefore, by having the fitting protrusion 34 along the inner peripheral edge of the packing 3 side surfaces 33 a and 33 b and having the locking groove 23 along the inner peripheral edge of the flange 21, the beverage flowing in the pipe is connected to the fitting protrusion 34. By fitting with the locking groove 23, it is possible to prevent the beverage from entering between the flange 21 and the packing 3.

  The pipes 2 a and 2 b have almost no flat surface on the inner peripheral side of the connecting surface 22. Therefore, the width from the inner periphery to the outer periphery of the connecting surface 22 can be shortened as compared with the conventional connecting structure of pipes having the same inner diameter. Thereby, the part which protrudes in an outer peripheral direction can be shortened compared with the connection structure of the conventional piping.

  The present invention is applicable to, for example, a pipe connection structure used for beverage production.

The disassembled perspective view which shows the connection structure of piping. The disassembled perspective view which shows the AA cross section in FIG. Sectional drawing which shows the connection structure of piping. Sectional drawing which shows the connection structure of the conventional piping. Sectional drawing which shows the connection structure of another conventional piping.

Explanation of symbols

1 Piping connection structure 2a, 2b Pipe 3 Packing 21 Flange 23 Locking groove 34 Fitting protrusion

Claims (1)

A pipe connection structure in which an annular packing is interposed between two cylindrical pipes to be connected, each having a flange formed at the end,
The side surface of the packing that comes into contact with the pipe is formed with a fitting protrusion that protrudes from the side surface of the packing along or near the inner peripheral edge. The connecting structure of the pipe is characterized in that a locking groove to be fitted to the fitting protrusion is formed on the connecting surface in contact, and the inner diameters of the pipe and the packing are substantially the same.

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