JP2006207767A - Seal packing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal packing for maintaining sufficient watertight property and sealing effects while preventing the deterioration of a seal member due to the deformation of a pipe during pipe caulking work or the deterioration of the seal member due to the contraction or expansion of the pipe without causing the twist or distortion of the seal packing. <P>SOLUTION: The seal packing 1 to be used for a connection portion of the pipe is made to abut on the inner or outer periphery of the pipe. On the inner and outer peripheries of a cylindrical body 2, annular protrusions 3 are provided which are each formed of at least one elastic body. The annular protrusion 3 is formed in a V-shape in the axial direction of the cylindrical body 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seal packing used for a pipe connection.

  Conventionally, various pipe joints and seal packings have been proposed as pipe connection methods for connecting various equipment pipes. In such a pipe connection method, a method of cutting a screw into a pipe and winding a sealing tape requires a thickness for threading the pipe, and the pipe member becomes thick.

  Further, since the pipe is connected and fixed using a nut or a housing, an operation of turning the nut or screw is required. At this time, screw tightening depends on the operator's feeling, and it is difficult to manage a fixed tightening torque, and stable quality piping cannot be performed.

  In order to solve such a problem, when connecting a relatively thin pipe (for example, a stainless steel pipe for general piping, various copper pipes, resin pipes, etc.), between the pipe 61 and the pipe 62 as shown in FIG. A caulking type pipe connection method is known in which pipe 62 is inserted into pipe 61 via a seal member 60 such as an O-ring, and caulking portion 66 is provided on the outer periphery of pipe 61 using a dedicated tool ( For example, see Patent Document 1).

In addition, as a seal packing that can connect the pipes in a watertight manner and allow bending and eccentricity of the pipes, a plurality of annular projections on the inner and outer peripheral surfaces of an elastic body made of rubber or the like are predetermined in the axial direction. A seal packing provided at intervals is known (see, for example, Patent Document 2).
JP-A-10-89565 Japanese Utility Model Publication No. 6-43470

  By the way, the conventional techniques as described above have the following problems to be solved.

  In the conventional caulking type pipe connection method, it is necessary to seal the connection part of the pipe using a sealing material such as an O-ring to make the connection part watertight, but the O-ring is twisted or twisted when the pipe is assembled. May occur. In such a state, the durability of the O-ring assembled to the pipe is shorter than that of a normal case, and there is a risk of water leakage during use.

  In addition, in the caulking type pipe connection method, it is necessary to caulk the pipe evenly without deforming the periphery of the O-ring so that an equal pressure is applied to the O-ring. To that end, skill of the operator is required. is there. For this reason, the inspection of the connecting portion of the pipe by the caulking method requires a process such as visual confirmation of the caulking portion of the pipe, and then a water pressure resistance test to confirm water tightness.

  However, even if the water tightness test by such a water pressure resistance test is passed, the caulking method of piping connection method directly confirms abnormalities such as O-ring twisting or twisting inside the connecting part and deformation of the O-ring. Since it was not possible, water leakage sometimes occurred at the connection part of the pipe later.

  In addition, the pipe connection part of a hot water pipe such as a water heater is subjected to a heat cycle from room temperature to approx. 90 ° C, so that the O ring of the pipe connection part is subjected to a load due to contraction and expansion of the pipe itself, and the O ring deteriorates. There was also a problem that it was easy to cause water leakage early.

  The present invention has been made paying attention to the above points, and the seal member is not twisted or twisted, and the deterioration of the seal member due to the deformation of the pipe caused by the caulking work of the pipe or the shrinkage of the pipe An object of the present invention is to provide a seal packing that prevents deterioration of the seal member due to expansion and expansion, maintains sufficient water tightness and exhibits a sealing effect.

  In order to solve the above-mentioned problems, the seal packing of the present invention is a seal packing which is used for a connecting portion of the pipe and is in contact with the inner or outer peripheral surface of the pipe, and has at least one on the inner and outer circumferences of the cylindrical body. The first feature is that an annular protrusion made of the above elastic body is provided, and the annular protrusion is formed in a V shape with respect to the axial direction of the cylindrical body.

  The annular protrusion has a lip surface at the tip formed in a V shape, and the lip surface is a flat surface that can be in close contact with the inner peripheral surface or the outer peripheral surface of the pipe. It is a feature.

  Furthermore, in the seal packing having the first feature or the second feature, a third feature is that the annular projection is used in combination so that the annular projection is in a V-shaped opening direction with respect to the pressure direction. Is.

  According to the present invention, since the inner periphery and the outer periphery of the cylindrical body have V-shaped annular protrusions made of an elastic body, the inner periphery and the outer periphery of the cylindrical body are deformed even when the pipe is deformed when caulking the pipe. Each of the annular projections provided in the can absorb the deformation of the pipe within the elastic deformation range, and the seal packing itself is not deformed. Further, the seal packing is not twisted or twisted when the seal packing is attached to the pipe.

  Since the annular protrusion made of an elastic body has a flat lip surface at the contact portion with the pipe, the contact portion between the annular protrusion and the pipe is brought into close contact, and the sealing performance is improved.

  Also, since the seal packing attached to the pipe is attached in a direction in which the annular protrusion opens in a V shape with respect to the pressure direction, when pressure is applied to the seal packing, the annular protrusion expands in the direction to open in the V shape and becomes a pipe. Water tightness is maintained because of contact.

  Furthermore, since the seal packing of the present invention has annular protrusions made of an elastic body on the inner periphery and outer periphery of the cylindrical body, the annular protrusion made of this elastic body is on the inner side against the thermal expansion and contraction of piping in a pipe such as a water heater. Since the expansion and contraction change of the pipe is absorbed outside, the water tightness of the pipe is maintained.

  Hereinafter, embodiments of the present invention will be described using specific examples.

  First, an embodiment of a seal packing according to the present invention will be described with reference to FIG. 1, FIG. 2, and FIG. Here, a perspective view of the seal packing of the present invention is shown in FIG. 1, FIG. 2 is a partial sectional view, and FIG. 3 is a sectional view.

  As shown in FIGS. 1 to 3, the seal packing 1 is provided with an annular protrusion 3 (an outer annular protrusion 3 a and an inner annular protrusion 3 b) made of an elastic body on the inner periphery and the outer periphery of a cylindrical body 2.

  The outer annular protrusion 3 a and the inner annular protrusion 3 b provided on the inner periphery and the outer periphery of the cylindrical body 2 are formed in a V shape with respect to the axial direction of the cylindrical body 2. The tip of the outer annular protrusion 3a and the inner annular protrusion 3b formed in a V-shape has a lip surface 4 that contacts the outer peripheral surface or inner peripheral surface of the pipe, and this lip surface 4 is the outer peripheral surface of the pipe or The surface in contact with the inner peripheral surface is a flat surface that can be closely contacted.

  Here, the outer annular protrusion 3 a and the inner annular protrusion 3 b are fixed to the cylindrical body 2 at their base end portions 5. Here, the method of fixing the cylindrical body 2 and the base end portion 5 may be adhesion or molding, and the base end portion 5 of the annular protrusion 3 only needs to be detached from the cylindrical body 2 by the force applied to the annular protrusion 3.

  The annular protrusion 3 is made of an elastic body such as synthetic rubber, and is in close contact with the pipe by the elasticity of the annular protrusion 3 itself. Furthermore, the cylindrical body 2 may be a metal or a hard synthetic resin in order to support the annular protrusion 3.

  FIG. 4 is a block diagram of a pipe connection showing a first embodiment using the seal packing of the present invention, (a) is a partial sectional view before the pipe connection, (b) is a partial sectional view after the pipe connection, (C) is the elements on larger scale of the A section of FIG.4 (b). Here, the piping is described as piping A, and the joint pipe is described as piping B.

  This pipe connection portion is composed of a pipe A21, a pipe B22 having a pipe connection diameter expanded as a joint pipe, and a seal packing 1, and a seal packing 1 (1a, 1a, 1b, 1b) between the pipe A21 and the pipe B22. Is fitted and the pipe connection is sealed.

  Here, the connection between the pipe A21 and the pipe B22 will be described. First, as shown in FIG. 4A, the seal packing 1 (1a, 1a) and the seal packing 1 (1b, 1b) are inserted into the pipe A21 in advance. As shown in FIG. 4B, the seal packing 1 is inserted in such a direction that the annular protrusion 3 of the seal packing 1 opens in a V shape with respect to the pressure P1 due to the fluid inside the pipe or the external pressure P2. Here, in order to insert the seal packing 1a into the pipe A21, since the internal annular protrusion 3b itself is an elastic body, the insertion resistance is small. The same applies when the seal packing 1b is inserted into the pipe B22. Therefore, the seal packing 1 can be attached to the pipe A21 and the pipe B22 without difficulty.

  Next, the pipe A21 and the pipe B22 are combined with the seal packing 1 (1a, 1a) attached to the pipe A21 and the seal packing 1 (1b, 1b) attached to the pipe B22.

  At this time, the outer annular protrusion 3a of the seal packing 1 (1a, 1a) attached to the pipe A21 hits the inner peripheral surface of the pipe B22, and the V-shaped annular protrusion 3 is narrowed. Further, since the inner annular protrusion 3b of the seal packing 1 (1b, 1b) of the pipe B22 hits the outer peripheral surface of the pipe A21 and the V-shaped annular protrusion 3 is narrowed, the seal packing 1 itself is not twisted or twisted. Can be combined. Further, when the seal packing 1 is fitted between the pipe A21 and the pipe B22 and the outer periphery of the pipe B22 is caulked, the seal packing 1 is inserted until the cylindrical bodies 2 of the seal packings 1 come into contact with each other in advance. The insertion position of the seal packing 1 at the connecting portion can be accurately determined.

  As shown in FIG. 4 (b), even when the caulking portion 26 of the pipe B22 is caulked, the seal packing 1 is formed in a V-shape made of elastic force on the inner and outer circumferences of the cylindrical body. Since the annular projection can absorb the deformation of the pipe within the elastic range, there is no problem such as deterioration due to the deformation of the seal packing.

  Next, when a fluid flows inside the pipes connected in this way, the annular protrusions 3 of the seal packing 1 are brought into close contact with the peripheral surfaces of the pipes A21 and B22 by the elastic force of the annular protrusions 3 of the seal packing 1, and the sealed state is maintained. Can keep.

  Further, as shown in FIG. 4 (c), when the fluid flows in the pipe and the pressure P1 in the pipe increases, the annular protrusion 3 formed in the V shape of the seal packing 1b is opened in the V shape by the pressure P1. Deform. As a result, the annular protrusion of the seal packing 1 is pressure-bonded over the entire length of the contact surface to the outer peripheral surface of the pipe A21 and the inner peripheral surface of the pipe B22 by the pressure P1 and the elastic force of the annular protrusion 3 itself, and the sealed state is maintained. And since the flat surface of the lip surface 4 of the seal packing 1 which contacts the pipe A and the pipe B is in close contact with the pipe, the water tightness is further increased. Similarly, with respect to the external pressure P2, the annular protrusion 3 formed in the V shape of the seal packing 1a is deformed in the direction of opening in the V shape, so that the sealed state is maintained. As described above, the annular protrusion 3 of the seal packing 1 is deformed in the direction of opening in a V shape by the pressures P1 and P2 and is in close contact with the pipe. Therefore, if the pressure is large, a more stable sealing effect can be obtained.

  FIG. 5 is a configuration diagram of a pipe connection portion showing a second embodiment using the seal packing of the present invention, (a) is a partial cross-sectional view before the pipe connection, (b) is a partial cross-sectional view after the pipe connection. (C) is the elements on larger scale of the C section of FIG.5 (b).

  The pipe connection of the second embodiment is composed of the pipe A21, the pipe C23, the seal packing 1 and the joint pipe 34, and the seal packing 1 (1a, 1a, 1b, 1b) between the pipe A21, the pipe C23 and the joint pipe 34. ) Is fitted and the pipe connection is sealed. In addition, about the same location as the said 1st Example, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Here, the connection of the pipe A, the pipe C, and the pipe comprising the seal packing and the joint pipe of the second embodiment will be described. First, as shown in FIG. 5A, the seal packing 1 is mounted on the joint pipe 34 in advance in the direction in which the annular protrusion 3 opens in a V shape with respect to the pressure P direction. At this time, in order to insert the seal packing 1 into the joint pipe 34, since the annular protrusion 3 itself of the seal packing 1 is an elastic force body, the insertion resistance is small.

  Next, in order to combine the pipe A21 and the pipe C23 with the seal packing 1 inserted into the joint pipe 34, the inner annular protrusion 3b of the seal packing 1 is brought into contact with the outer peripheral surface of the pipe A or the pipe C and is formed into a V-shaped annular protrusion. 3 can be inserted into the joint pipe 34 without narrowing or twisting the seal packing 1 itself.

  Further, after the pipes A and C are combined with the joint pipe 34, when the joint pipe 34 is caulked, it is inserted in advance until the cylindrical body of each seal packing abuts so that the seal packing 1 can be accurately positioned at the pipe connection portion. Can be.

  As shown in FIG. 5 (b), the seal packing 1 is formed in a V-shape consisting of elastic force on the inner and outer circumferences of the cylindrical body even if the pipe is deformed when the caulking portion 26 of the joint pipe 34 is caulked. Since the formed annular projection can absorb the deformation of the pipe within the elastic range, there is no problem such as deterioration due to the deformation of the seal packing.

  Next, when fluid flows into the pipes connected in this way, the annular protrusion 3 of the seal packing 1 is brought into close contact with the peripheral surfaces of the pipe A21, the pipe C23 and the joint pipe 34 by the elastic force of the annular protrusion 3 of the seal packing 1. The sealed state can be maintained.

  As shown in FIG. 5C, when the fluid flows in the pipe and the pressure P in the pipe increases, the annular protrusion 3 formed in the V shape of the seal packing 1 (1a, 1b) Deforms in the direction to open the letter As a result, the annular protrusion of the seal packing 1 is crimped over the entire length of the abutting surface to the outer peripheral surface of the pipe A21 and the pipe 23 and the inner peripheral surface of the joint 34 by the pressure P and the elastic force of the annular protrusion 3 itself, and the sealed state is maintained. It is. And since the flat surface of the lip surface 4 of the seal packing 1 contacting between the pipe A, the pipe C and the joint is in close contact with the pipe, the water tightness is further increased.

  Furthermore, even if the piping itself contracts or expands due to the flow of warm water through the piping connecting section shown in FIGS. 4 and 5, the seal packing causes the piping to contract or expand due to the elasticity of the V-shaped annular projection. Since it absorbs, the durability of the seal packing itself is not lowered.

It is a perspective view of the seal packing which concerns on this invention. It is a fragmentary sectional view of the seal packing which concerns on this invention. It is sectional drawing of the seal packing which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the piping connection which shows 1st Example using the seal packing of this invention, (a) is a fragmentary sectional view before piping connection, (b) is a fragmentary sectional view after piping connection, (c). These are the elements on larger scale of the A section of FIG.4 (b). It is a block diagram of the piping connection which shows the 2nd Example using the seal packing of this invention, (a) is a fragmentary sectional view before piping connection, (b) is a fragmentary sectional view after piping connection, (c). These are the elements on larger scale of the C section of FIG.5 (b). It is a general | schematic fragmentary sectional view which shows the piping connection using the conventional oil seal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seal packing 2 Cylindrical body 3 Annular protrusion 4 Lip surface 5 Base end part 20 Seal member (O-ring)
21 Piping A
22 Piping B
23 Piping C
26 Caulking part 34 Joint pipe

Claims (3)

  A seal packing which is in contact with an inner peripheral surface or an outer peripheral surface of a pipe and is used for a connecting portion of the pipe, wherein an annular protrusion made of at least one elastic body is provided on an inner periphery and an outer periphery of the cylindrical body, The protrusion is formed in a V shape with respect to the axial direction of the cylindrical body.   The annular protrusion has a lip surface at a tip portion formed in a V shape, and the lip surface is a flat surface that can be in close contact with an inner peripheral surface or an outer peripheral surface of the pipe. The seal packing according to 1. 3. The seal packing according to claim 1, wherein the annular protrusion is used in combination so that the annular protrusion is in a V-shaped opening direction with respect to the pressure direction.

Images