JP5394192B2 - Hose joint structure - Google Patents

Description

  The present invention relates to a nipple inserted into an inner surface of an end portion of a hose formed with a flat inner surface and an outer surface, an annular packing inserted into an outer surface of the end portion of the hose, and a semi-cylinder positioned on the outer surface of the packing The present invention relates to a hose joint structure that includes a pair of holders having inner surfaces, pressurizes the outer surface of the packing by fastening the pair of holders to each other, and connects the nipple and the hose end.

  A hose joint structure is used to connect the hoses together. The hose joint structure includes a nipple inserted into the inner surface of the end of the hose, a packing for preventing liquid leakage, and a holder for connecting the nipple to the end of the hose.

  For example, the hose joint disclosed in Patent Document 1 below is a spiral nipple that can be fitted along the shape of a hose outer peripheral surface, with a nipple having a circular concave groove formed in a cylindrical portion inserted into the inner surface of the hose end. And a packing having a concavo-convex shape portion on the inner peripheral surface.

  In the hose joint disclosed in Patent Document 2 below, the outer diameter of the outer fitting portion 3b of the nipple (butting member 3) is set to be substantially the same as the inner diameter of the hose (tube 1), and the hose end outer surface is flat. A semicircular packing (caulking member 10) having a smooth inner surface is elastically pressed. A spiral protrusion 1B is formed on the outer peripheral surface of the hose 1, and is formed in a corrugated shape having an uneven shape.

JP 2006-38192 A JP 2000-310379 A

  Such a hose coupling structure is used to connect various hoses, and is used, for example, in the field of food processing. In such a case, it is necessary to frequently disassemble the hose joint structure for cleaning and replacement of the hose. Therefore, it is preferable that the structure can be easily disassembled and assembled and is easy to clean.

  In view of this point, the structure disclosed in Patent Document 1 has a circumferential concave groove formed in the nipple, which reduces the resistance to insertion and extraction, but accumulates dust such as food waste in the groove. It is easy to remove completely, and there is a problem that it takes time to clean. Moreover, when it cannot remove, a problem that miscellaneous bacteria will propagate will arise. The same problem occurs when uneven portions are formed on the outer surface of the hose or the inner surface of the packing.

  Although the hose joint disclosed in Patent Document 2 is described that the outer surface of the nipple is formed flat and the outer diameter of the outer fitting portion 3b is set to be substantially the same as the inner diameter of the hose, it is shown in FIG. Thus, it inserts in the form which press-fits in the end part inner surface of a hose. When press-fitting is repeated in the disassembly / assembly operation, permanent strains remain locally, and germs remain at such locations and cannot be removed even by washing, and the germs tend to propagate easily.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hose joint structure that can be easily disassembled and assembled, can be easily cleaned, and can suppress propagation of germs.

In order to solve the above problems, the hose joint structure according to the present invention is:
A pair having a nipple inserted into the inner surface of the end portion of the hose formed with a flat inner surface and an outer surface, an annular packing inserted into the outer surface of the end portion of the hose, and a semi-cylindrical inner surface located on the outer surface of the packing A hose joint structure that presses the outer surface of the packing by connecting the pair of holders to each other and connects the nipple and the hose end,
The nipple is in contact with a first insertion portion having a flat outer surface having the same diameter as or slightly smaller than the inner surface of the hose end, and the end surface of the hose end, and the outer surface is larger than the outer diameter of the outer surface of the hose end. A set buttock, and
The packing has a function of sealing the outer surface of the second insertion portion having a flat inner surface having the same diameter or a slightly larger diameter than the outer surface of the hose, and larger than the inner surface of the second insertion portion. And a seal portion having an inner diameter.

  The operation and effect of the hose joint structure having such a configuration will be described. First, as for the hose used as connection object, an end inner surface and an end outer surface are formed flat. The nipple inserted into the inner surface of the end portion has a flat outer surface, and even if dust or the like remains on the surface, it can be easily washed away by washing. Therefore, various germs are difficult to propagate. Further, the outer surface of the nipple is the same diameter as or slightly smaller than the inner surface of the end portion of the hose, and the resistance to insertion and removal is low, and disassembly and assembly are easy. The hose to be connected is also flat on both the inner surface and the outer surface of the end portion, can be easily washed, and can suppress the propagation of germs.

  Furthermore, the inner surface of the annular packing inserted into the outer surface of the end portion of the hose is also flat, and can be easily cleaned in the same manner, and the propagation of germs can be suppressed. Further, since the inner surface of the packing is set to have the same diameter or a slightly larger diameter than the outer surface of the end portion of the hose, insertion and removal operations are less resistant, and disassembly and assembly are facilitated.

  Moreover, the sealing part formed in the collar part and the seal part formed in packing can implement | achieve a strong sealing function by both pressure contact. That is, since the pressure contact portion forms a step with the outer surface of the hose end portion, it is possible to reliably prevent the fluid such as food moving inside the hose from leaking to the outside. The outer peripheral surface of the packing is pressed by fastening a pair of holders, and the connection and sealing between the hoses can be ensured. As described above, it is possible to provide a hose joint structure that can be easily disassembled and assembled, can be easily cleaned, and can suppress propagation of germs.

  In the present invention, it is preferable that the inner diameter of the seal portion is set to a dimension such that the flange portion is press-fitted. Thereby, the leakage of the fluid from a seal part can be prevented reliably. Further, since the press-fitting is limited to the collar portion, the ease of disassembly and assembly can be maintained.

  The holder according to the present invention includes a first pressing portion that presses the second insertion portion of the packing, and a second pressing portion that presses the seal portion, and the second pressing portion is a seal of the packing. It is preferably formed as a concave groove corresponding to the shape of the part.

  When the pair of holders are fastened, the second insertion portion of the packing is pressed by the first pressing portion, and the seal portion of the packing is pressed by the second pressing portion. The second insertion portion has a large surface area and is pressed with a relatively small pressure due to the dimensional relationship described above. The seal portion has a smaller surface area than the second insertion portion, but is pressed with a high pressure due to the dimensional relationship described above. By forming the second pressing portion in a concave groove shape corresponding to the shape of the seal portion, it is possible to press with a high pressure and to realize a high sealing effect.

  In the holder according to the present invention, it is preferable that a first restriction wall and a second restriction wall for restricting the movement of the packing in the longitudinal direction are formed so as to protrude toward the hose center side.

  With this configuration, the packing can be positioned at a predetermined location, and when the pair of holders are fastened, the packing can be reliably pressed elastically. Thereby, it can seal reliably.

  In the above, it is preferable that the first restricting wall is also in contact with the flange portion and restricts movement of the nipple in the removal direction. Thereby, a nipple can be reliably hold | maintained to the inner surface of the end part of a hose, and a seal | sticker can also be performed reliably.

  In the present invention, a taper pressing portion is provided at a boundary between the first pressing portion and the second pressing portion, and the seal portion is configured to be biased toward the standing wall surface of the flange portion when the holder is fastened. It is preferable. With this configuration, the collar part can be pressed from all directions, and the seal part can be brought into close contact with the collar part with high pressure. Therefore, the sealing effect can be further ensured.

In the present invention, the hose has a reinforcing structure inside, and the hardness is
It is preferable that the order is nipple>hose> packing.

  By setting such a relationship, it is possible to facilitate the assembly and disassembly of each component, maintain the strength required for the component, and further enhance the sealing effect.

Exploded perspective view showing the structure of the hose joint structure Half sectional view showing the structure of hose joint structure

  A preferred embodiment of a hose joint structure according to the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing the configuration of the hose joint structure according to the present embodiment, and FIG. 2 is a half sectional view of the assembled hose joint structure according to FIG.

  The end of the hose 100 is shown in the figure, and has a flat end inner surface 101 and a flat end outer surface 102, and a reinforcing wire 104 is inserted into the inside in a spiral shape for reinforcement. (It is an example of a reinforcing structure). The hose 100 is formed of, for example, a flexible resin. Although it does not specifically limit as a use of the hose 100, Preferably, it uses in the field of food processing. In such a case, liquid (liquid) food, beverage or the like moves inside the hose 100.

The nipple 1 has a first insertion portion 10 that is inserted into the end portion inner surface 101 of the hose 100. The first insertion portion 10 has a flat outer surface. The outer diameter of the distal end portion 10a of the first insertion portion 10 is gradually reduced toward the distal end, and the insertion operation into the hose 100 is facilitated. If the inner diameter of the end inner surface 101 of the hose 100 is D1, and the outer diameter of the first insertion portion 10 is D3,
D1 = D3 + α
And α = 0 to 3.0 mm. That is, the outer diameter of the first insertion portion 10 of the nipple 1 is set to be the same as or slightly smaller than the inner diameter of the end inner surface 101. With this setting, when the nipple 1 is inserted into the hose 100, the frictional resistance can be reduced, and the insertion operation can be facilitated.

  A flange portion 11 is provided adjacent to the first insertion portion 10. The outer diameter D4 of the flange 11 is set to be larger than the outer diameter D2 of the end outer surface 102 of the hose 100. Further, a connecting portion 12 and a flange portion 13 are provided following the flange portion 11. The connecting portion 12 includes a flat outer surface portion 12a and a tapered portion 12b having an inclined outer surface. The nipple 1 has a flat inner surface and is made of a highly rigid resin or metal.

  When the nipple 1 is inserted into the hose 100, the nipple 1 is inserted to a position where it comes into contact with the end surface 103 of the hose 100. Thereby, the nipple 1 can be positioned and seal leakage from the end face 103 can be prevented.

The packing 2 is made of rubber having elasticity, and is formed in an annular shape as shown in FIG. The packing 2 has the 2nd insertion part 20 which has the flat inner surface inserted in the edge part outer surface 102 of the hose 100. FIG. If the outer diameter of the end outer surface 102 is D2 and the inner diameter of the inner surface of the second insertion portion 20 is D5,
D5 = D2 + β
And β = 0 to 2.0 mm. That is, the inner diameter of the second insertion portion 20 of the packing 2 is set to be the same as or slightly larger than the outer diameter of the end outer surface 102. With this setting, when the packing 2 is inserted into the hose 100, the frictional resistance can be reduced, and the insertion operation can be facilitated.

  A seal portion 21 is provided adjacent to the second insertion portion 20, and the seal portion 21 is assembled at a position corresponding to the flange portion 11 as shown in FIG. 2. When the inner diameter of the seal portion 21 is D6, the seal portion 21 is set to be larger than the outer diameter D2 of the end outer surface 102. By setting such dimensions, as shown in the enlarged view A of FIG. 2, a step is formed, so that the sealing performance can be improved. The outer surface of the packing 2 is also formed flat.

  Further, if the inner diameter D6 is the same as or slightly smaller than the outer diameter D4 of the flange portion 11, the seal portion 21 is pressed into the flange portion 11. Therefore, the sealing performance can be further improved.

  As shown in FIG. 2, the outer surface of the seal portion 21 has a larger outer diameter than the outer surface of the second insertion portion 20, and a step is formed on the outer surface side. The stepped portion is elastically deformed into a taper as shown in FIG. 2A in a state in which the holders 3 are fastened, but the stepped portion is a vertical standing wall surface by itself.

  A pair of the same holders 3 are prepared, and are connected so as to sandwich the packing 2 from above and below. The holder 3 presses the first pressing portion 30 formed in a semi-cylindrical surface (C shape in front view) that presses the outer surface of the second insertion portion 20 of the packing 2 and the outer surface of the seal portion 21 of the packing 2. And a second pressing portion 32. Corresponding to the outer shape of the packing 2, the outer diameter of the second pressing portion 31 is set to be larger than the outer diameter of the first pressing portion 30. That is, the second pressing portion 31 is formed in a concave groove shape. Further, a taper pressing portion 31 a is provided at a boundary portion between the first pressing portion 30 and the second pressing portion 31.

  A first restriction wall 32 and a second restriction wall 33 are formed at the rear end portion and the front end portion of the holder 3, respectively, and the packing 2 is assembled between the restriction walls 32 and 33 so as to be accommodated. . Thereby, the movement to the longitudinal direction of the packing 2 can be controlled, and the sealing performance by the packing 2 can be ensured. In the cross-sectional view of FIG. 2, both the first and second regulating walls 32 and 33 are formed so as to protrude toward the center of the hose 100. As shown in the enlarged view A, a slight gap is formed between the tip of the first regulating wall 32 and the outer surface portion 12a of the nipple 1. Further, as shown in the enlarged view B, a slight gap is also formed between the tip of the second restriction wall 33 and the end outer surface 102 of the hose 100. In addition, the 1st control wall 32 is comprised so that the rear-end surface of the collar part 11 may contact | abut so that the movement of the collar part 11 of the nipple 1 may also be controlled.

  Further, the seal portion 21 is urged toward the first restriction wall 32 in the direction by the action of the taper pressing portion 35 described above. The second pressing portion 31 has an effect of pressing the seal portion 21 against the outer surface of the flange portion, and further has an effect of pressing the seal portion 21 against the vertical wall surface of the flange portion 11 by the taper pressing portion 35. Thereby, the collar part 11 can be closely_contact | adhered with the seal | sticker part 21 from all directions, and a high sealing performance can be ensured.

  The holder 3 has a pair of flanges 34 on both the left and right sides, and two bolt holes 34a are formed respectively. When fastening the holders 3 to each other, the bolts 4 are inserted into the bolt holes 34a and tightened by the nuts 4a to connect the holders 3 to each other.

The hardness (rigidity) of the nipple and packing is as follows.
Nipple>hose> packing. This facilitates assembling and disassembling of each part, maintains the strength required for the part, and further enhances the sealing effect.

<Assembly procedure>
Next, the assembly procedure of the hose joint structure according to this embodiment will be described. The second insertion portion 20 of the packing 2 is inserted into the outer end surface 102 of the hose 100. As described above, since the inner diameter of the second insertion portion 20 is set to be slightly larger than the outer diameter of the end outer surface 102, the insertion operation can be performed smoothly. Next, the first insertion portion 10 of the nipple 1 is inserted into the end portion inner surface 101 of the hose 100. Also at this time, since the outer diameter of the first insertion portion 10 is set to be slightly smaller than the inner diameter of the end inner surface 101, the insertion operation can be performed smoothly. At this time, the flange portion 11 is inserted to a position where it comes into contact with the end surface 103 of the hose 100. Further, the rear end surface of the flange 11 and the rear end surface of the packing 2 are aligned.

  Next, it fastens using the pair of holders 3 so as to press the packing 2 from above and below. At this time, the holder 3 is placed so that the packing 2 is accommodated between the first and second regulating walls 32 and 33. Thereby, the movement of the packing 2 is regulated. Further, the movement of the rear end surface of the flange portion 11 is also restricted by the first restriction wall 32. Fastening between the holders 3 is performed using a bolt 4 and a nut 4a. In addition, arrangement | positioning of the holder 3 is not limited to an up-down direction, It can set to the left-right direction and arbitrary directions other than that.

  When the hose 100 or the like is washed, the disassembled state can be obtained as shown in FIG. Thereby, the member which comprises the hose 100 and another hose joint structure can be wash | cleaned.

<Effect>
According to said structure, the outer surface and inner surface of the hose 100, the outer surface and inner surface of the nipple 1, and the outer surface and inner surface of the packing 2 are all flat surfaces without unevenness. Therefore, it is possible to prevent dust from remaining on the unevenness and breeding of germs, and even if dust or the like adheres to the surface, it can be easily removed by washing.

  In addition, since the first insertion portion 10 of the nipple 1 is not configured to be press-fitted into the hose 100, the problem of sealing performance due to such a configuration can be ensured by the configuration of the flange portion 11 and the seal portion 21. it can. That is, in the seal portion 21, the dimensional relationship is set so as to be compressed more strongly than the other portions, and the step is formed with the end outer surface 102 of the hose 100, so that the liquid leakage hardly occurs. Because it is. Accordingly, when viewed as the entire hose joint structure, the sealing performance does not deteriorate.

  When the pair of holders 3 are fastened, the second insertion portion 20 of the packing 2 is pressed by the first pressing portion 30. The second insertion portion 20 has a large surface area as can be seen from FIG. Moreover, it presses with a comparatively small pressure from the above-mentioned dimensional relationship. On the other hand, the seal portion 21 of the packing 2 is pressed by the second pressing portion 31. The seal portion 21 has a smaller surface area than the second insertion portion 20, but is pressed with a high pressure due to the dimensional relationship described above. In particular, the sealing performance of the flange portion 11 can be enhanced by providing the taper pressing portion 31a.

<Another embodiment>
The use of the hose joint structure according to the present invention is not limited to food-related, but can be applied to other industrial fields. For example, the present invention can also be applied in the fields of chemicals, cosmetics, pharmaceuticals, etc., in which it is necessary to frequently disassemble and clean the hose joint structure in order to avoid contamination of the conveyed product.

DESCRIPTION OF SYMBOLS 1 Nipple 10 1st insertion part 11 collar part 2 packing 20 2nd insertion part 21 seal part 3 holder 30 1st press part 31 2nd press part 31a taper press part 4 bolt 4a nut 100 hose 101 end part inner surface 102 end outer surface 103 End face

Claims (7)

A pair having a nipple inserted into the inner surface of the end portion of the hose formed with a flat inner surface and an outer surface, an annular packing inserted into the outer surface of the end portion of the hose, and a semi-cylindrical inner surface located on the outer surface of the packing And a hose joint structure that presses the outer surface of the packing by connecting the pair of holders to each other and connects the nipple and the hose end,
The nipple is in contact with a first insertion portion having a flat outer surface having the same diameter as or slightly smaller than the inner surface of the hose end, and the end surface of the hose end, and the outer surface is larger than the outer diameter of the outer surface of the hose end. A set buttock, and
The packing has a function of sealing the outer surface of the second insertion portion having a flat inner surface having the same diameter or a slightly larger diameter than the outer surface of the hose, and larger than the inner surface of the second insertion portion. A hose joint structure comprising: a seal portion having an inner diameter.   The hose joint structure according to claim 1, wherein an inner diameter of the seal portion is set to a size such that the flange portion is press-fitted.   The holder includes a first pressing portion that presses the second insertion portion of the packing and a second pressing portion that presses the seal portion, and the second pressing portion has a shape of the seal portion of the packing. The hose joint structure according to claim 1 or 2, wherein the hose joint structure is formed as a corresponding concave groove.   The said holder is formed with the 1st control wall which controls the movement to the longitudinal direction of the said packing, and the 2nd control wall projecting to the hose center side, The characterized by the above-mentioned. The hose joint structure according to any one of the preceding claims.   The hose joint structure according to claim 4, wherein the first restricting wall is also in contact with the flange portion and restricts movement of the nipple in the pulling direction.   A taper pressing portion is provided at a boundary between the first pressing portion and the second pressing portion, and the seal portion is urged toward the standing wall surface of the flange portion when the holder is fastened. The hose joint structure according to any one of claims 3 to 5. The hose has a reinforcing structure inside, and the hardness is
The hose joint structure according to any one of claims 1 to 6, wherein the order is nipple>hose> packing.

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