JP5055021B2 - hose - Google Patents

Description

  The present invention relates to a hose, and particularly relates to a hose provided with a highly conductive member having a higher electrical conductivity than the hose.

  Conventionally, various proposals have been made on flexible joints used for supplying fluid to precision instruments, sinks, washstands, toilets, and the like. For example, the strength of the hose is increased by including an inner layer disposed on the innermost radial direction of the hose, a reinforcing layer that covers the inner layer from the outer side in the radial direction, and an outer skin layer that covers the reinforcing layer. Flexible joints that can be used are known.

  By the way, in the field of manufacturing a product or the like using a precision instrument, a fluorine-based fluid may be allowed to flow through the flexible joint for the purpose of cleaning or cooling the product.

For this reason, in flexible joints used in precision instruments, a conductive substance (for example, carbon) is used to prevent charging (static electricity) generated on the inner surface of the hose due to contact between the inner surface of the hose and the fluid during use. Black), a hose containing a conductive material such as a rubber material or an antistatic material is used (see, for example, Patent Document 1 and Patent Document 2).
JP 2000-130648 A JP 2004-197757 A

  However, in the conventional flexible joint described above, charging occurs on the inner surface of the hose due to contact between the inner surface of the hose and the fluid, and particularly when a fluid having a high electric resistance value (fluorine-based fluid) flows. Charge was easy to occur. As a result, when the inner layer exceeds the allowable value for extracting electricity, the charge generated on the inner surface of the hose due to contact between the inner surface of the hose and the fluid sparks to the reinforcing layer or the metallic member that is circumscribed. Fluid could leak from the hose.

  Accordingly, the present invention has been made in view of such circumstances, and provides a hose that can reliably prevent the occurrence of charging in the hose and can prevent fluid from leaking from the hose. The purpose is to do.

  In order to solve the above situation, the present invention has the following features. First, the invention according to the first feature of the present invention is a hose comprising a high-conductivity member having a higher electrical conductivity than the hose, and the high-conductivity member is accommodated inside the hose while being in contact with the inner surface of the hose. In addition, the gist is to be electrically connected to the outside of the hose.

  According to such a feature, the high electrical conductivity member having a higher electrical conductivity than the hose is housed inside the hose in a state of being in contact with the inner surface of the hose, and is electrically connected to the outside of the hose. Even when a fluid with high flow rate (for example, fluorine-based fluid) flows, charging (static electricity) generated on the inner surface of the hose due to contact between the inner surface of the hose and the fluid is conducted to the outside of the hose by the high conductive member. Therefore, this charge can be released to the outside of the hose. As a result, charging can be reliably prevented from occurring in the hose, and fluid can be prevented from leaking from the hose.

  Another aspect of the invention is characterized in that the inner surface of the hose is formed of a resin having low conductivity (for example, polyester or fluorine resin).

  According to such a feature, since the inner surface of the hose is formed of a resin having low conductivity (for example, polyester or fluorine resin), charging generated on the inner surface of the hose due to contact between the inner surface of the hose and the fluid ( Static electricity) does not spark to the reinforcing layer or the metallic member that circumscribes it, and fluid can be prevented from leaking from the hose.

  The gist of another aspect of the invention is that the highly conductive member is housed inside the hose in contact with a connecting member that connects the hose and another pipe.

  According to such a feature, when a highly conductive member is accommodated in the hose while being in contact with the connecting member in addition to the inner surface of the hose, a fluid having a high electrical resistance value (for example, a fluorine-based fluid) flows. Even if it exists, since charging (static electricity) generated on the inner surface of the hose by contact between the inner surface of the hose and the fluid is conducted to the outside of the hose by the high conductive member and the connecting member, this charging is performed via the connecting member. It is possible to escape to the outside.

  Another aspect of the invention is characterized in that the high conductive member is a coil spring.

  According to such a feature, since the high conductive member is a coil spring, it is easy to cope with the bending / bending of the hose, and a large area in contact with the inner surface of the hose can be secured. The generated charge (static electricity) can be easily released to the outside of the hose, and the flow rate of the fluid flowing inside the hose can be secured.

  The gist of another aspect of the invention is that the length (L1) in the longitudinal direction of the highly conductive member is longer than the length (L2) in the longitudinal direction of the hose.

  According to this feature, the length (L1) in the longitudinal direction of the high conductive member is longer than the length (L2) in the longitudinal direction of the hose, so that the high conductive member is repelled in the longitudinal direction of the hose inside the hose. Thus, the end region of the high conductive member and the connecting member can be easily brought into contact with each other.

  The gist of another aspect of the invention is that the thickness or thickness (T) of the high-conductivity member itself is 0.3 to 3.0 mm.

  According to such a feature, the thickness or thickness (T) of the high conductive member itself is 0.3 to 3.0 mm, so that even if the hose is bent or bent, the inside of the hose (pipe The flow rate of the fluid flowing inside the hose can be ensured without blocking the passage).

  The invention according to other features includes an inner layer disposed on the radially inner side of the hose, a radially outer side of the inner layer, a reinforcing layer that reinforces the inner layer, and a radially outer side of the reinforcing layer. The gist is to provide an outer skin layer that covers the reinforcing layer.

  According to the present invention, it is possible to provide a hose that can reliably prevent the occurrence of charging in the hose and can prevent fluid from leaking from the hose.

  Hereinafter, an example of a flexible joint including the hose according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings is contained.

  FIG. 1 is a longitudinal sectional view showing a flexible joint according to the present embodiment, and FIG. 2 is an enlarged sectional view showing a part of the flexible joint according to the present embodiment.

  As shown in FIG.1 and FIG.2, the flexible joint 1 can be fitted to the bendable / bendable hose 10 and both ends of the hose 10, and the hose 10 and other pipes (not shown). Are generally constituted by a connecting member (hereinafter referred to as a joint fitting 20) and a high conductive member (hereinafter referred to as a metal member 30) having a higher electrical conductivity than the hose 10.

  The hose 10 has a straight pipe structure in which an inner surface and an outer surface are formed straight. The hose 10 includes an inner layer 11 that is disposed on the innermost radial direction of the hose 10 and has a lower electrical conductivity than the metal member 30. The inner layer 11 is formed of a resin having low conductivity (for example, polyester or fluorine resin). That is, the inner surface of the hose 10 is formed of a resin having low conductivity.

  A reinforcing layer 12 that reinforces the inner layer 11 is disposed outside the inner layer 11 in the radial direction. The reinforcing layer 12 is formed by braiding a cord (for example, copper wire, hard steel wire, stainless steel hard wire, polyester fiber), and the hose 10 itself is flexibly reinforced in a state where the inner layer 11 is covered. Yes.

  An outer skin layer 13 that covers the reinforcing layer 12 is disposed on the outer side in the radial direction of the reinforcing layer 12. The outer skin layer 13 is formed of a thermoplastic elastomer resin or a rubber material. Note that the outer skin layer 13 may be formed of a resin having low conductivity, like the inner layer 11.

  The joint fitting 20 has a tubular shape as a whole (so-called nipple). The joint fitting 20 includes a hose attachment portion 21 to which the hose 10 is attached, and a male screw portion 22 that extends toward the other end.

  The hose attachment portion 21 has an outer diameter that allows the hose attachment portion 21 to be inserted into the hose 10. By inserting the hose attachment portion 21 into the hose 10 and tightening the hose 10 radially inward by the caulking member 23, the hose 10 and the hose attachment portion 21 are fixed, and the hose 10 is prevented from coming off and fluid leakage. Is done.

  The caulking member 23 has an inner diameter that is set to be larger than the outer diameter of the hose 10 in an initial state, and is intermittently inserted by a dedicated fastener (not shown) after the hose mounting portion 21 is inserted into the hose 10. By reducing the diameter and tightening the hose 10, it is possible to prevent the hose 10 from coming off and the fluid from leaking.

  A cap nut 24 is rotatably attached to the male screw portion 22. The fitting 20 (flexible joint 1) can be connected to another pipe line by screwing the cap nut 24 into a male thread part (not shown) of another pipe line (the other side).

  The metal member 30 is accommodated in the hose 10 in a state of being in contact with the inner surface (that is, the inner layer 11) of the hose 10 and the joint fitting 20 (E portion in the drawing). The metal member 30 is a coil spring whose coil axis direction is along the longitudinal direction of the hose 10 (direction A in FIG. 1). The metal member 30 is formed of a material (for example, stainless copper wire) having high electrical conductivity and excellent water resistance.

  The length (L1) in the longitudinal direction of the metal member 30 is such that the metal member 30 is repelled in the longitudinal direction of the hose 10 inside the hose 10 and easily contacts the end region 31 of the metal member 30 and the joint fitting 20. Therefore, it is preferable that the length of the hose 10 is set longer than the length (L2) in the longitudinal direction. In the drawing, the length (L1) in the longitudinal direction of the metal member 30 is shorter than the length (L2) in the longitudinal direction of the hose 10 because this is accommodated in the hose 10.

  In particular, the length (L1) in the longitudinal direction of the metal member 30 is preferably set to 1.1 times or more with respect to the length (L2) in the longitudinal direction of the hose 10.

  That is, the end region 31 of the metal member 30 is different from the other metal members 30 in the state where adjacent turns are in close contact with each other and in contact with the inner surface of the hose 10 (that is, the inner layer 11). 32 is in contact with the joint fitting 20.

  Moreover, it is preferable that the thickness or thickness (T) of metal member 30 itself is 0.3-3.0 mm. If the thickness or thickness (T) of the metal member 30 itself is smaller than 0.3 mm, the metal member 30 is deformed (broken) inside the hose 10 and the inner surface of the hose 10 and the metal member 30 are separated. Sometimes. Further, if the thickness or thickness (T) of the metal member 30 itself is larger than 3.0 mm, the flow path may be blocked or the weight / bending rigidity may be increased.

  Further, the pitch (P) of the metal member 30 is generated on the inner surface of the hose 10 by the contact between the inner surface (the inner layer 11) of the hose 10 and the fluid flowing through the hose 10 while ensuring the flexibility of the hose 10. It is preferable that the thickness is 3 to 10 mm in order to easily release the charging (static electricity) to the outside of the hose 10.

(Action / Effect)
According to the flexible joint 1 according to the present embodiment described above, the metal member 30 (high conductivity member) having a higher electrical conductivity than the hose 10 is connected to the inner surface (inner layer 11) of the hose 10 and the joint fitting 20 ( Even when a fluid having a high electrical resistance value (for example, a fluorine-based fluid) flows by being accommodated in the hose 10 while being in contact with the connection member), the inner surface of the hose 10 and the fluid Since the charge (static electricity) generated on the inner surface of the hose 10 by the contact is conducted to the outside of the hose 10 by the metal member 30, this charge can be released to the outside of the hose. As a result, charging can be reliably prevented from occurring in the hose 10, and fluid can be prevented from leaking from the hose 10.

  By the way, if a resin containing a conductive substance, a rubber material, or an antistatic material is used for the inner layer 11 of the hose 10, impurities easily precipitate in the fluid flowing through the hose 10, and the deposit adheres to the precision product.・ Because it becomes difficult to prevent mixing and to prevent charged static electricity from sparking to the reinforcing layer 12, use of a resin containing this conductive substance, rubber material, or antistatic material is required. It was hoped that it would be abolished.

  For this reason, the inner layer 11 of the hose 10 is formed of a resin having low conductivity (for example, polyester or fluorine resin), so that the inner surface of the hose 10 is brought into contact with the inner surface of the hose 10 by contact with the fluid. The generated charge (static electricity) does not spark to the reinforcing layer 12 or the metal member (not shown) that circumscribes it, and fluid can be prevented from leaking from the hose 10.

  Further, since the hose 10 has a straight pipe structure, the caulking member 23 makes it easier to secure the tightening property between the hose 10 and the hose attachment portion 21 than the bellows structure, and it is easy to prevent the hose 10 from coming off and fluid leakage. be able to.

  Further, since the metal member 30 (high conductive member) is a coil spring, it is easy to cope with the bending / bending of the hose 10, and it is possible to ensure a wide area in contact with the inner surface (inner layer 11) of the hose 10. Therefore, the charge (static electricity) generated on the inner surface of the hose 10 can be easily released to the outside of the hose 10 and the flow rate of the fluid flowing inside the hose 10 can be ensured.

  Further, since the length (L1) in the longitudinal direction of the metal member 30 is longer than the length (L2) in the longitudinal direction of the hose 10, the metal member 30 is repelled in the longitudinal direction of the hose 10 inside the hose 10. Thus, the end region 31 of the metal member 30 and the fitting 20 can be easily brought into contact with each other.

  Furthermore, even if the hose 10 is bent or bent because the thickness or thickness (T) of the metal member 30 (high conductive member) itself is 0.3 to 3.0 mm, The flow rate of the fluid flowing inside the hose 10 can be ensured without blocking the inside (pipe).

(Modification 1)
In the flexible joint 1 according to the above-described embodiment, the end region 31 of the metal member 30 is in a state where adjacent turns are in close contact with each other, and is in contact with the inner surface of the hose 10 (that is, the inner layer 11). Although it was described as being in contact with the joint fitting 20 in a state, it may be modified as follows. In addition, the same code | symbol is attached | subjected to the same part as the flexible joint 1 which concerns on embodiment mentioned above, and a different part is mainly demonstrated.

  FIG. 3 is an enlarged cross-sectional view illustrating a part of the flexible joint according to the first modification. As shown in FIG. 3, the metal member 30 (coil spring) is housed in the hose 10 in a state of being in contact with the inner surface (that is, the inner layer 11) of the hose 10 and the joint fitting 20.

  The end region 31 of the metal member 30 is drawn. Specifically, the end region 31 of the metal member 30 is wound in a tapered shape in which the coil diameter gradually decreases toward the joint fitting 20 side.

  According to the flexible joint 1 according to the first modification example, the metal member 30 can be easily inserted into the hose 10 because it is inserted into the hose 10 from the tapered end region 31 side. The workability at the time of manufacturing the flexible joint 1 can be further improved.

(Modification 2)
In the flexible joint 1 which concerns on embodiment mentioned above, although the edge part 32 of the metal member 30 demonstrated that it was in contact with the coupling metal fitting 20, you may deform | transform as follows. In addition, the same code | symbol is attached | subjected to the same part as the flexible joint 1 which concerns on embodiment mentioned above, and a different part is mainly demonstrated.

  FIG. 4 is an enlarged cross-sectional view illustrating a part of the flexible joint according to the second modification. As shown in FIG. 4, the metal member 30 (coil spring) is housed inside the hose 10 in contact with the inner surface (that is, the inner layer 11) of the hose 10 and the joint fitting 20.

  The end portion 32 of the metal member 30 protrudes toward the outside of the joint fitting 20 in a state in contact with the joint fitting 20. Specifically, the end portion 32 of the metal member 30 may protrude through the hose attachment portion 21 of the joint fitting 20 to the outside of the caulking member 23 as shown in FIG. As shown to (b), it passes through between the hose 10 and the coupling metal fitting 20 or between the hose 10 and the caulking member 23 and protrudes to the outside. Note that the end portion 32 of the metal member 30 does not necessarily protrude toward the outside of the joint fitting 20, and may be welded to the joint fitting 20, for example, and is electrically connected to the outside of the hose 10. It only has to be.

  According to the flexible joint 1 according to the modified example 2 described above, since the joint fitting 20 and the metal member 30 are securely fixed, the inner surface of the hose 10 is brought into contact with the inner surface of the hose 10 and the fluid. The generated charge (static electricity) can be surely released to the outside of the hose by the high conductive member. That is, charging can be reliably prevented from occurring in the hose 10, and fluid can be prevented from leaking from the hose 10. Further, even when the joint member 20 is formed of resin or the like, the charge (static electricity) generated on the inner surface of the hose 10 can be easily released to the outside of the hose 10.

[Other embodiments]
As described above, the contents of the present invention have been disclosed through the embodiments. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention.

  Specifically, although the metal member 30 (high conductive member) has been described as a coil spring, the present invention is not limited to this, and can cope with the bending of the hose 10 and the inner surface of the hose 10 and the joint fitting 20. Of course, for example, a linear spring or a leaf spring may be used.

  From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

It is longitudinal direction sectional drawing which shows the flexible joint which concerns on this Embodiment. It is an expanded sectional view showing a part of flexible joint concerning this embodiment. 10 is an enlarged cross-sectional view showing a part of a flexible joint according to Modification 1. FIG. 10 is an enlarged cross-sectional view showing a part of a flexible joint according to Modification 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Flexible joint 10 ... Hose 11 ... Inner layer 12 ... Reinforcement layer 13 ... Outer skin layer 20 ... Joint metal fitting 21 ... Hose attachment part 22 ... Male screw part 23 ... Caulking member 24 ... Cap nut 30 ... Metal member 31 ... End Part region 32 ... end

Claims (8)

A hose comprising a highly conductive member having a higher electrical conductivity than the hose,
The highly conductive member is housed inside the hose in contact with the inner surface of the hose, and is electrically connected to the outside of the hose ,
The inner surface of the hose is formed of resin,
An end portion of the highly conductive member protrudes toward the outside of the connection member in contact with a connection member connecting the hose and another pipe line .   2. The hose according to claim 1, wherein the high conductive member is accommodated in the hose in a state of being in contact with a connection member that connects the hose and another pipe line. The high conductive member includes, a hose according to claim 1 or claim 2 characterized in that it is a coil spring. The hose according to any one of claims 1 to 3 , wherein a length (L1) in a longitudinal direction of the highly conductive member is longer than a length (L2) in a longitudinal direction of the hose. . The hose according to any one of claims 1 to 4 , wherein a thickness or a thickness (T) of the highly conductive member itself is 0.3 to 3.0 mm. An inner layer disposed on the innermost radial direction of the hose;
A reinforcing layer disposed on a radially outer side of the inner layer and reinforcing the inner layer;
The hose according to any one of claims 1 to 5 , further comprising an outer skin layer disposed on a radially outer side of the reinforcing layer and covering the reinforcing layer.   The connection member includes a hose attachment portion to which the hose is attached,
  A caulking member that tightens the hose inserted in the hose attachment portion radially inward of the hose;
  7. The hose according to claim 1, wherein an end portion of the highly conductive member protrudes outside the caulking member through the hose attachment portion.   The connection member includes a hose attachment portion to which the hose is attached,
  A caulking member that tightens the hose inserted in the hose attachment portion radially inward of the hose;
  The end portion of the highly conductive member protrudes between the hose and the hose attachment portion and between the hose and the caulking member and protrudes to the outside. The hose according to any one of the above.

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