JP2868207B2 - Hose fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose joint for connecting a hose such as a synthetic resin hose through which a fluid such as water or gas flows, and more particularly, to a hose nipple on an outer peripheral surface thereof.
The present invention relates to a hose in which a hose made of a non-adhesive material or a material which cannot be expected to have sufficient strength even when adhered is hermetically inserted.

[0002]

2. Description of the Related Art Conventionally, a hose made of synthetic resin is connected to a hose joint of this type by fastening the end of the hose to a hose nipple with a hose band or, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 8-170771. In some cases, an elastic cylinder is provided between the outer peripheral surface of the hose nipple and the inner peripheral surface of the hose, and the elastic cylinder is inserted into the elastic cylinder using the elasticity of the hose to thereby integrally connect the elastic cylinder.

[0003]

However, in such a conventional hose joint, in the former case, the end portion of the hose fastened by the hose band is distorted due to the passage of time with the constituent resin. There is a problem that leakage occurs. Further, in the latter case, since a minute gap is inevitably formed between the hose and the elastic cylinder and between the elastic cylinder and the hose nipple, the pressure of the fluid supplied into the hose, That is, if the internal pressure rises to a predetermined level or more for some reason, there is a problem that the fluid may enter the minute gap and leak. Especially in the case of a helical reinforced hose, the helical rib made of a hard reinforcing wire protrudes helically in the axial direction, so even if only the portion where the helical rib is projected is tightened toward the hose nipple with a fastener, Since the portion between the spiral ribs is not tightened at all, there is a risk that fluid may enter the portion between the spiral ribs and leak. In order to prevent this, a concave portion to be fitted with the spiral rib is spirally recessed, so that not only the portion where the spiral rib protrudes but also the entire portion of the spiral reinforcing hose including the portion between the spiral ribs. There is a problem that it is necessary to use a band having a special structure in which the band is tightened.

An object of the present invention is to improve the sealing performance with an increase in internal pressure without deformation of a hose over time. Claim 2
The invention described in addition to the object of the invention described in claim 1,
The purpose is to bond even if the material of the hose and the material of the hose nipple are in a non-bonding relationship. The third aspect of the present invention has the object of preventing the hose from peeling off from the coating layer due to the internal pressure, in addition to the object of the first or second aspect of the present invention. A fourth aspect of the present invention has the object of completely preventing leakage of a fluid only by tightening a spiral rib of a spiral reinforcing hose in addition to the object of the third aspect of the present invention.

[0005]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, a coating layer made of a material that can be bonded to a hose is provided along an outer peripheral surface of a hose nipple. The base end of the coating layer provided on the inner peripheral surface of the hose nipple and the end of the hose inserted thereinto are bonded together by an adhesive means. A space having a substantially V-shaped cross section is formed between the distal end of the coating layer provided around the distal end side peripheral surface of the hose nipple excluding the portion and the non-adhesive end continuous with the end of the hose. It is characterized in that the portion is provided so as to face the base end of the coating layer. A second aspect of the present invention is characterized in that the configuration of the first aspect of the present invention further includes a configuration in which the bonding unit is an adhesive. The invention according to claim 3 is the invention according to claim 1 or 2
The invention according to the invention is characterized in that a configuration is added to the distal end of the hose, in which a fastener that constantly presses at least a part of the distal end toward the base end of the coating layer is attached.
The invention according to claim 4 has the structure of the invention according to claim 3,
The hose is a helical reinforcement hose, and a configuration in which a fastener is pressed against the outer peripheral end of the helical rib is added.

[0006]

According to the first aspect of the present invention, the inner pressure of the fluid that has entered the space having a substantially V-shaped cross section acts to press the distal end of the coating layer toward the distal end side peripheral surface of the hose nipple. A minute gap between the tip of the layer and the peripheral surface on the tip side of the hose nipple is completely sealed. According to the second aspect of the present invention, since the configuration in which the bonding means is an adhesive is added to the configuration of the first aspect, the base end of the coating layer and the end of the hose are bonded via the adhesive. Is done. According to a third aspect of the present invention, in the configuration according to the first or second aspect, a tightening tool for constantly pressing at least a part of the end toward the base end of the coating layer is attached to the end of the hose. Even if a force that presses the non-adhesive end of the hose radially outward due to the internal pressure acts, at least a part of the end of the hose is directed to the base end of the coating layer with the fastener. By being constantly pressed, the non-adhesive end of the hose does not spread radially outward of the hose.
The invention according to claim 4 is the same as the structure according to claim 2, wherein the hose is a spiral reinforcing hose, and a configuration in which a fastener is pressed against the outer peripheral end of the spiral rib is added. Since only the protruding portion is spirally tightened toward the base end of the coating layer by the fastener, the spiral rib does not spread outward in the radial direction of the hose, thereby preventing peeling from the coating layer.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIG. 1, a cylindrical connection tube portion A1 is integrally provided at one end in the axial direction of a joint main body A for connection to another machine, and the outer peripheral surface thereof is provided with a screw or the like. A connecting portion A2 is formed, and a cylindrical hose nipple 1 is integrally protruded from the other end in the axial direction of the joint main body A. A hose H is formed on the outer peripheral surface of the hose nipple 1 as a hose H by a soft material such as vinyl chloride. A spiral reinforcing hose made of a synthetic resin is inserted.

The hose nipple 1 is made of, for example, a hard synthetic resin such as Duracon, polyethylene, polypropylene, nylon or the like, metal, or the like. The outer diameter of the hose nipple is gradually increased from the distal end toward the back. Are formed in a bamboo shoot shape by providing a plurality of tapered portions 1a in the axial direction, and the coating layer 2 is integrally provided along substantially the entire length of the outer peripheral surface including the tapered portions 1a. In the case of this embodiment, two tapered portions 1a ₁ and 1a ₂ are continuously provided from the axial end of the hose nipple 1, and an annular concave portion 1b is provided on the back side. Although not shown, three or more tapered portions 1a may be provided from the axial end to the base end of the hose nipple 1, for example, by providing a tapered portion 1a instead of the annular concave portion 1b. .

The coating layer 2 is made of a material that can be adhered to the material of the hose H inserted into the hose nipple 1, more specifically, the same material as the hose H or a material similar thereto. using the heat-shrinkable tube made of soft synthetic resin such as vinyl chloride, the heat-shrinkable tube after insertion so as to cover the tapered portion 1a _1, 1a _2, and the annular recess 1b, heating the heat shrinkable tube that by and covers over the outer peripheral surface full length is contracted from the distal edge of the distal side tapered portion 1a ₁ to the back side edge of the annular recess 1b. Instead of using the heat-shrinkable tube, the tapered portions 1a ₁ and 1a ₂ and the concave portion 1c may be immersed in a coating liquid to cover the entire outer peripheral surface.

[0010] Then, the outer peripheral surface of the inner side tapered portion 1a ₂ and the annular recess 1b on the circumferentially provided by the coating layer 2 base end portion 2a constituting the inner side circumferential surface of the hose nipple 1, inserted into this an inner peripheral surface of the distal portion H1 of the hose H to be, bonded by the adhesive means 3 is provided around on the tip end side tapered portion 1a ₁ is a front end side circumferential surface of the hose nipple 1 except the base end portion 2a Tip 2b of the coating layer 2 and the end H1 of the hose H
Between the non-adhesive end portion H2 and the non-adhesive end portion H2, a space portion 4 having a substantially V-shaped cross section whose inner diameter gradually decreases toward the distal end side of the hose nipple 1 is formed. It is provided so as to face the end 2a. The bonding means 3
It is preferable to use an adhesive of the same material as the material of the hose H and the coating layer 2 so as to obtain a strong adhesive force with the hose H and the coating layer 2. A similar material may be used, and when the material of the hose nipple 1 and the hose H are both made of a thermoplastic resin, high-frequency welding may be used instead of the above adhesive. In the case of the present embodiment, the hose H is provided on the surface of the base 2a of the coating layer 2.
An adhesive 3 of the same material as that of the coating layer 2 is applied, and the distal end portion H1 of the hose H is inserted up to the adhesive 3 so that the outer peripheral surface of the base end portion 2a and the inner peripheral surface of the distal end portion H1. Between the base end 2a and the end H
1 is bonded via an adhesive 3.

Further, when the hose H is used as a duct hose, for example, the pressure of a fluid such as water or gas supplied into the hose H may be higher than the adhesive strength of the adhesive 3. In some cases, if necessary, a fastener 5 that constantly presses at least a part of the end portion H1 toward the base end portion 2a of the coating layer 2 is attached to the end portion H1 of the hose H. In the case of the present embodiment, a rigid reinforcing wire H wound around the outer surface of a spiral reinforcing hose H using a cylindrical flat band or a collar as the fastening tool 5 is used.
By pressing against the outer peripheral end of the helical rib H4 made of No. 3, only the portion where the helical rib H4 protrudes is helically tightened toward the base end 2a of the coating layer 2.

Next, the operation of the hose joint will be described. First, when a fluid such as water or gas is supplied into the hose H, an internal pressure P is applied by the fluid. As shown in FIG. 2, in the space 4 having a substantially V-shaped cross section, the fluid flowing into the space 4 is stopped at the acute angle portion 4a. And the non-adhesive end portions H2 of the first and second non-adhesive ends H2 are pressed in a direction in which the non-adhesive end portions H2 are spread.

[0013] Specifically, for a force P1 which presses toward the tip portion 2b of the covering layer 2 by the internal pressure P to the distal side tapered portion 1a ₁ is a front end side circumferential surface of the hose nipple 1, of the covering layer 2 tip Even if there is a small gap C between the portion 2b and the base end 2a and the tapered portions 1a ₁ and 1a _{2 of the} hose nipple 1 and the annular concave portion 1b, this small gap is particularly caused by the coating layer 2. does not enter the fluid is completely sealed at the portion of the tip portion 2b and the distal side tapered portion 1a _1. Moreover, as the internal pressure P increases, the coating layer 2
Power P for pressing the tip portion 2b to the distal end side tapered portion 1a ₁
Therefore, even if the internal pressure P of the fluid increases significantly, the fluid does not leak from the minute gap C.

Although the force P2 for radially pressing the non-adhesive end portion H2 of the hose H outward in the radial direction of the hose H due to the internal pressure P acts, the adhesive 3 forms the base end portion 2a of the coating layer 2 with the adhesive 3. The end portion H1 of the hose H is adhered. Usually, the adhesive force of the adhesive 3 is greater than the pressing force P due to the internal pressure P.
2, the end portion H1 is not peeled off from the adhesive 3 and / or the base end portion 2a of the coating layer 2, and the hose H
As long as it is within the rigidity range of itself, it does not swell and deform outward.

Even if the pressing force P2 due to the internal pressure P becomes larger due to the reason that the adhesive force by the adhesive 3 is reduced with the use over a long period of time, as shown in FIG. If at least a part of the end portion H1 of the hose H is continuously pressed toward the base end portion 2a of the coating layer 2, the end portion H1 does not spread outward in the radial direction of the hose H, so that the adhesive 3 and / or the coating layer 2 does not come off from the base end 2a. Furthermore, the fastening tool 5 can be prevented from spreading radially outward by tightening at least only the portion where the spiral rib H4 protrudes toward the base end portion 2a of the coating layer 2 in a spiral shape. The shape of the tool 5 also includes a concave portion that fits with the spiral rib H4 of the hard reinforcing wire H3 in a spiral shape, and includes not only a portion where the spiral rib H4 protrudes but also a portion between the spiral ribs H4. It is not necessary to use a band of a special structure in which the entire end H1 is tightened.

In the embodiment described above, a cylindrical connecting tube portion A for connecting to another machine is connected to one end of the joint body A in the axial direction.
1, but is not limited to this, and is not limited to this.
It is not necessary to project 1 integrally. Also hose nipple 1
A spiral reinforcing hose made of a soft synthetic resin such as vinyl chloride is inserted as the hose H into the outer peripheral surface of the hose. However, the hose is not limited to this, and a hose having no spiral rib H4 or a rubber hose different in material is used. For example, the same operation as that shown above can be obtained with any hose. Further, the shape of the fastening tool 5 is not limited to the above-described one. If at least only the portion where the spiral rib H4 is projected is spirally fastened toward the base end portion 2a of the coating layer 2, another structure is obtained. Is also good.

[0017]

As described above, according to the first aspect of the present invention, according to the present invention, the distal end portion of the hose nipple is moved around the distal end of the hose nipple by the internal pressure of the fluid entering the space having a substantially V-shaped cross section. The force that presses against the surface acts, and the minute gap between the tip of these coating layers and the peripheral surface on the tip side of the hose nipple is completely sealed. The sealing property can be improved with the rise of the height. Therefore, leakage of fluid can be completely prevented even when used for a long period of time, as compared with the conventional one in which the end portion of the hose fastened by the hose band is distorted with time and the constituent resin constituting the hose is leaked. . Also, compared to the conventional one in which a minute gap is inevitably formed between the hose and the elastic cylinder and between the elastic cylinder and the hose nipple, respectively.
Even if the internal pressure rises to a predetermined level or more, leakage of the fluid can be completely prevented.

According to a second aspect of the present invention, in addition to the effect of the first aspect, the base end of the coating layer and the end of the hose are bonded via an adhesive, so that the material of the hose and the hose nipple are improved. Can be bonded even if the materials are not bonded. Therefore, the material of the hose and the hose nipple is not limited to a specific material, which is convenient.

According to a third aspect of the present invention, in addition to the effects of the first or second aspect, even if a force for pressing the non-adhesive end of the hose outward in the radial direction of the hose due to the internal pressure acts on the fastener, By continuously pressing at least a part of the end of the hose toward the base end of the coating layer, the non-adhesive end of the hose does not spread outward in the radial direction of the hose, so the hose is covered with internal pressure. Peeling from the layer can be prevented.

According to a fourth aspect of the present invention, in addition to the effect of the third aspect of the present invention, only the portion of the reinforcing hose at which the spiral rib protrudes is helically tightened toward the base end of the coating layer by a fastener. Thus, the spiral rib does not spread outward in the radial direction of the hose and is prevented from peeling off from the coating layer. Therefore, leakage of the fluid can be completely prevented only by tightening the spiral rib of the spiral reinforcing hose. Therefore, a concave portion that fits with the spiral rib is formed in a spiral shape so that not only the portion where the spiral rib protrudes but also the entire portion of the spiral reinforcing hose including the portion between the spiral ribs is tightened. There is no need to use a band having a structure, and a simple structure such as a cylindrical shape may be used. The structure of the fastener can be simplified, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a hose joint according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional front view showing a main part in an enlarged manner.

[Explanation of symbols]

H Hose, spiral reinforcement hose H1 End portion H2 Non-adhesive end portion H4 Spiral rib 1 Hose nipple 1a ₁ Tip side peripheral surface (tip side taper portion) 1a ₂ Back side peripheral surface (back side taper portion) 1b Back side peripheral surface ( (Annular concave portion) 2 coating layer 2a base end 2b tip 3 adhesive means, adhesive 4 space 4a acute angle portion 5 fastening tool

Claims (4)

(57) [Claims] 1. A hose joint in which a hose (H) made of a material which is not adhered to the hose nipple (1) or a material which cannot be expected to have sufficient strength even when adhered is hermetically inserted into an outer peripheral surface of the hose nipple (1). A coating layer (2) made of a material that can be bonded to the hose (H) is integrally provided along the outer peripheral surface of the hose nipple (1), and the hose nipple (1)
Bonding the base end (2a) of the coating layer (2) provided on the back side peripheral surface (1a ₂ , 1b) to the end (H1) of the hose (H) inserted therein. Bonded by means (3),
Tip of the base end front end side circumferential surface of the (2a) hose nipple (1) except for (1a ₁₎ coating layer provided around on (2) (2b), and is transported end of the hose (H) ( A space (4) having a substantially V-shaped cross section between the non-adhesive end (H2) continuous with H1) and an acute angle portion (4a) of the space (4a) faces the base end (2a) of the coating layer (2). A hose joint characterized by being provided in such a manner. 2. A hose joint according to claim 1, wherein said bonding means is an adhesive. 3. An end (H1) of the hose (H),
The hose joint according to claim 1 or 2, further comprising a fastener (5) for constantly pressing at least a part of the distal end (H1) toward the base end (2a) of the coating layer (2). 4. The hose (H) is a spiral reinforcing hose, and a fastener (5) is attached to an outer peripheral end of the spiral rib (H4).
The hose joint according to claim 3, wherein