JPH0663988U - High pressure hose fittings - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the rubber of the joint part deteriorates to some extent, leakage is unlikely to occur. [Structure] The expanded rubber end 30 formed at the end of the high pressure rubber hose 20 is provided with a hose flange 40 and a seal flange 5.
In the high-pressure hose joint that is sandwiched and fastened with 0, the end face portion of the seal flange 50 facing the expanded rubber end 30 is formed into a concave conical inclined surface 5s having an inner peripheral side recessed. Expanded rubber end 3 facing the conical inclined surface 5s
Ring-shaped ridges 36, 3 protruding in the axial direction on the surface of 0
Formed 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high-pressure hose joint for connecting a high-pressure rubber hose reinforced with a steel wire or the like for circulating a high-pressure fluid.

[0002]

[Prior art]

 FIG. 3 shows a conventional high pressure hose joint. A steel wire 24 is integrally cast in the rubber 22 of the high-pressure rubber hose 20 and reinforced so as to withstand high pressure. The rubber portion 32 covers the end of the high-pressure rubber hose 20 with a ring-shaped core metal 35 stopped by a steel wire 34 which is a part of the steel wire 24, and the rubber end 30 has a larger diameter than the hose. Has been formed. The expanded rubber end 30 is composed of a hose flange 40 having a flange portion 4k protruding in the inner diameter direction on the anti-joining end surface and a seal flange 50 having an inner diameter receiving portion 53 protruding in the cylindrical direction in the inner peripheral portion in the axial direction. The hose flange 40, the seal flange 50, and the packing 60 are sandwiched and the pipe flange 70 is fastened with a fastening bolt nut 80 so that the enlarged rubber end 30 sandwiched therebetween is compressed in the axial direction. To connect. The inner diameter receiving portion 53 of the seal flange 50 receives the inner peripheral surface of the enlarged rubber end portion 30, and the flange portion 4k of the hose flange 40 presses the enlarged rubber end portion 30 toward the seal flange 50. 30 cannot be removed, and the rubber portion 32 is elastically deformed and comes into pressure contact with the seal end surface of the seal flange 50, thereby stopping leakage of the high pressure fluid from this joint portion.

[0003]

[Problems to be solved by the device]

 The conventional high-pressure hose joint is as described above, but if the rubber portion 32 of the expanded rubber end portion 30 deteriorates due to long-term use and loses its elastic restoring force, the rubber portion 32 contacts the seal flange 50. There was a problem that the pressure dropped and it was not possible to counter the high pressure, and leakage started to occur.

The present invention has been made to solve the above problems, and maintains a high contact surface pressure even if the rubber part deteriorates to some extent, and the contact surface pressure automatically increases as the fluid pressure increases. The purpose is to obtain a high-pressure hose joint that does not easily leak.

[0005]

[Means for Solving the Problems]

 A high-pressure hose joint according to the present invention is a high-pressure hose joint in which an end of an expanded rubber formed at an end of a high-pressure rubber hose is sandwiched between a hose flange and a seal flange to be fastened and connected. The end face portion facing the enlarged rubber end portion is formed into a concave conical inclined surface having an inner peripheral side recessed, and the surface portion of the enlarged rubber end portion facing the concave conical inclined surface is projected in the axial direction. A ring-shaped ridge is formed.

[0006]

[Action]

 If the hose flange and the seal flange are fastened and connected so that the expanded rubber end of the high-pressure hose joint in this invention is compressed in the axial direction, the ring-shaped ridge formed on the expanded rubber end will have a protruding shape. Therefore, the seal flange comes into contact with a small area. That is, it comes into close contact with the seal flange with a high contact pressure, and tightly seals the leakage of fluid. When the fluid pressure increases, the fluid pressure pushes the ring-shaped ridge strongly outward, but the ring-shaped ridge is in contact with the concave conical inclined surface of the seal flange. As a component force of the fluid force pushing in one direction, a component force that presses the ring-shaped ridge against the concave conical inclined surface of the seal flange occurs, and the sealing force increases. Also, since the ring-shaped ridges are much more easily deformed than the main body of the expanded rubber end, when the ring-shaped ridges are deformed outward by fluid pressure, the concave conical inclined surface of the seal flange becomes Since the shape is close to the hose side, it will come into stronger contact with the sealing flange, increasing the sealing force. Even if the rubber is deteriorated and the elastic deformation capacity is lowered by the action of increasing the sealing force by this fluid pressure, the sealing ability is maintained.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a side view of a high pressure hose joint according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of the high pressure hose joint shown in FIG. In the figure, 20 is a high-pressure rubber hose, and high-strength fiber, steel wire 24, etc. are cast in a rubber 22 which is the main body of the high-pressure rubber hose 20 and reinforced so as to withstand high pressure. An enlarged rubber end 30 is formed at the end of the high-pressure rubber hose 20 to be connected. The structure of the expanded rubber end 30 is such that a ring-shaped strong cored bar 35 having a diameter slightly larger than that of the hose is fixed by winding a steel wire 34 continuous with the steel wire 24 and covering it with a rubber part 32. It has a tightly packed structure that is considerably larger in diameter than the hose and is strong and continuous with the hose.

As shown in FIG. 1, the hose flange 40 is formed such that the inner diameter portion from the joint end face to the central portion of the thickness is fitted to the outer diameter shape of the expanded rubber end portion 30, and the anti-joint end face portion is formed. Is a shape that receives the rear shape of the enlarged rubber end portion 30, and has a collar portion 4k protruding in the inner diameter direction so that the inner diameter is slightly smaller than the outer diameter of the high-pressure rubber hose 20. The seal flange 50 has an inner diameter receiving portion 53 formed on the inner peripheral portion thereof so as to project in a tubular shape in the axial direction to receive the inner diameter side of the expanded rubber end portion 30. The seal flange 50 is connected to the pipe flange 70 with the packing 60 interposed therebetween. The expanded rubber end portion 30 is sandwiched between the hose flange 40 and the seal flange 50, and the fastening bolt nut 80 is passed through so as to compress the sandwiched expanded rubber end portion 30 in the axial direction. 40, the seal flange 50, and the pipe flange 70 are fastened and connected.

As shown in FIGS. 1 and 2, on the joint end surface of the seal flange 50, a groove portion 5t that is recessed in an annular shape is formed following the outer diameter surface of the inner diameter receiving portion 53, and from the groove portion 5t of the joint end surface. A concave conical inclined surface 5s is formed in a portion facing the enlarged rubber end portion 30 toward the outer diameter side and gradually shallows from the groove portion 5t in which the inner peripheral side is recessed toward the outer peripheral side. Further, two ring-shaped protrusions 36 and 37 are formed on the axial surface portion of the rubber portion 32 of the expanded rubber end portion 30 facing the concave conical inclined surface 5s of the seal flange 50. The ring-shaped ridges 36 and 37 formed on the expanded rubber end portion 30 are formed such that the inner ring-shaped ridges 36 project axially higher than the outer ring-shaped ridges 37. The protruding height of the high-pressure hose joint allows a leak-free connection by leaving a gap A between the hose flange 40 and the seal flange 50 when the high-pressure hose joint is connected. That is, both the inner ring-shaped ridge 36 and the outer ring-shaped ridge 37 may contact the concave pyramid-shaped inclined surface 5s of the seal flange 50 to the same extent with sufficient contact pressure for sealing. It is formed so that it can be done.

Next, the operation of the high pressure hose joint shown in FIGS. 1 and 2 will be described. First, the hose flange 40 is attached to the enlarged rubber end portion 30 so as to be externally fitted and inserted. As shown in FIG. 1, the inner diameter of the flange portion 4k of the hose flange 40 is smaller than the outer diameter of the high pressure rubber hose 20, so that the collar portion 4k should be pressed into the high pressure rubber hose 20 at the neck of the enlarged rubber end 30. Then, the hose flange 40 is attached to the enlarged rubber end portion 30 of the high-pressure rubber hose 20. Once attached, the expanded rubber end 30 is formed with a diameter larger than the outer diameter of the high-pressure rubber hose 20, and the expanded rubber end 30 contains a durable cored bar 35, so that the flange 4k of the hose flange 40 is covered. Is caught on the rear surface of the expanded rubber end 30 and will not come off even if the high-pressure rubber hose 20 is strongly pulled to the right in the figure. On the other hand, the seal flange 50 is attached to the pipe flange 70 by sandwiching the packing 60.

Next, as shown in FIG. 1, the hose flange 40 attached to the high-pressure rubber hose 20 is pressed against the seal flange 50 attached to the pipe flange 70. Since the outer diameter portion of the inner diameter receiving portion 53 of the seal flange 50 is formed so as to be fitted into the inner diameter portion of the enlarged rubber end portion 30, the enlarged rubber end portion 30 is not attached to the inner diameter receiving portion 53 of the seal flange 50. The ring-shaped ridges 36 and 37 of the enlarged rubber end portion 30 come into contact with the inclined surface 5s of the seal flange 50. The hose flange 40, the seal flange 50, and the pipe flange 70 are passed through the bolt holes and fastened with an appropriate force through the fastening bolt nut 80, and the ring-shaped ridges 36 and 37 of the expanded rubber end 30 are attached to the inclined surface of the seal flange 50. Contact 5s with appropriate contact pressure. At that time, an appropriate gap A is formed between the hose flange 40 and the seal flange 50. The gap A enables the retightening when the protrusion height of the ring-shaped ridges 36 and 37 is reduced or the elastic restoring force is reduced.

As described above, when the high-pressure hose joint is connected as shown in FIG. 1 and the high-pressure fluid is circulated in the hose, the pressure of the high-pressure fluid is increased by the inner diameter receiving portion 53 of the seal flange 50 and the expanded rubber. Although it passes through the gap between the end 30 and the groove 5t, since the ring-shaped ridges 36 and 37 have a protruding shape, the ring-shaped ridges 36 and 37 contact the inclined surface 5s of the seal flange 50. The contact area to be contacted is smaller than that of the conventional one in which the entire surface is in contact, and therefore, the contact pressure at which the ring-shaped ridges 36 and 37 contact the inclined surface 5s becomes high in inverse proportion to the contact area, and at high contact pressure. They will come into contact to form a seal line, which seals the pressure fluid leak. Even if there is a high-pressure fluid that leaks by breaking through the seal line between the inner ring-shaped convex ridge 36 and the inclined surface 5s, the high pressure fluid leaks between the outer ring-shaped convex 37 and the inclined surface 5s. Seal lines block and seal leaks.

When the pressure of the high-pressure fluid flowing through the high-pressure rubber hose 20 increases, the high-pressure fluid enters the groove 5t and passes through the seal line due to the contact between the inner ring-shaped ridge 36 and the inclined surface 5s of the seal flange 50. However, at the same time, as shown in FIG. 2, a high fluid pressure exerts a pressure on the fluid pressure acting surface 3f of the inner peripheral ring-shaped ridge 36. Then, since the inner peripheral side ring-shaped ridge 36 has a shape projecting from the main body of the rubber portion 32 of the expanded rubber end portion 30, it is relatively easily deformed, and the inner peripheral side ring-shaped ridge 36 is subjected to fluid pressure. The high fluid pressure applied to the action surface 3f tends to deform outward. However, the inclined surface 5s of the seal flange 50 with which the inner ring-shaped ridge 36 is in contact is an inclined surface that is closer to the expanded rubber end portion 30 as it goes outward, so that the inner ring-shaped ridge 36 is formed. When is deformed outward, a strong contact pressure is generated as a component force in the normal direction of the inclined surface 5s due to the wedge action of the inner peripheral ring-shaped ridge 36. The contact pressure of the inner circumferential ring-shaped ridge 36 becomes higher as the fluid pressure becomes higher, and the higher the contact pressure becomes, the stronger the force for preventing leakage becomes. Therefore, even if the rubber portion 32 of the expanded rubber end portion 30 and the rubber such as the inner ring-shaped ridge 36 are deteriorated and the elastic restoring force is reduced, the contact pressure using this fluid pressure increases, Fluid leaks can be sealed. The above operation is exactly the same for the outer peripheral ring-shaped ridge 37.

In the above embodiment, two ring-shaped ridges, the inner ring-shaped ridge 36 and the outer ring-shaped ridge 37, are formed on the expanded rubber end 30. The number may be one or three or more. Further, in the illustrated embodiment, the cross-sectional shape of the ring-shaped ridges 36 and 37 is merely a rounded and bulged shape, but for example, the inner peripheral side portion (lower portion in the figure) is larger than the outer peripheral side portion (upper portion in the figure). It is also possible to make the pressing action by the fluid pressure stronger as a cross-sectional shape in which) is projected.

[0015]

[Effect of device]

 As described above, according to the present invention, since the ring-shaped ridge protruding in the axial direction is formed on the end of the expanded rubber so as to contact the sealing surface of the seal flange, the ring-shaped ridge is applied with a high contact pressure. Since the ridges can be brought into contact with each other and the conical inclined surface is formed on the sealing surface of the seal flange, the higher the fluid pressure, the stronger the ring-shaped ridges come into contact with each other. A high-pressure hose joint that can maintain the fluid leak-sealing capability even when the force is reduced is obtained.

[Brief description of drawings]

FIG. 1 is a side view of a high pressure hose joint according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of a high-pressure hose joint according to an embodiment of the present invention.

FIG. 3 is a side half-longitudinal sectional view of a conventional high-pressure hose joint.

[Explanation of symbols]

20: high-pressure rubber hose, 22: rubber, 24: steel wire,
30: expanded rubber end portion, 32: rubber portion, 35: core metal,
36: Inner peripheral side ring-shaped ridge, 37: Outer side ring-shaped ridge, 40: Hose flange, 4k: Collar part, 50: Seal flange, 53: Inner diameter receiving part, 5t: Groove part, 5
s: inclined surface, 60: packing, 70: pipe flange, 8
0: Fastening bolt nut.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location F16L 33/00 33/28 F16L 33/00 A (72) Creator Toshimoto Obama 2-1, Oiwake, Hiratsuka-shi, Kanagawa No. Yokohama Rubber Co., Ltd. Hiratsuka Factory

Claims (2)

[Scope of utility model registration request] 1. A high-pressure hose joint in which an expanded rubber end formed at an end of a high-pressure rubber hose is sandwiched between a hose flange and a seal flange and fastened together to connect the expanded rubber end of the seal flange. The end face portion facing to the inner peripheral side is formed into a concave conical inclined surface that is recessed on the inner peripheral side, and a ring-shaped ridge protruding in the axial direction is formed on the surface portion of the enlarged rubber end portion facing the concave conical inclined surface. A high-pressure hose fitting characterized by 2. A high-pressure hose joint in which an expanded rubber end formed at the end of a high-pressure rubber hose is sandwiched between a hose flange and a seal flange and fastened to each other, and the expanded rubber end of the seal flange is connected. The end face portion facing to the inner peripheral side is formed into a concave conical inclined surface that is recessed, and the surface portion of the enlarged rubber end portion facing the concave conical inclined surface is closer to the inner peripheral side than the outer peripheral side. Is a high-pressure hose joint characterized in that a plurality of ring-shaped ridges protruding in the axial direction are formed.