JP6654411B2 - Pipe end protection equipment and piping products - Google Patents

Description

  The present invention includes a pipe end protector attached to a pipe end to prevent foreign matter from entering the pipe and protects a sealing surface of the pipe end, and a pipe end protector at the pipe end. Related to plumbing products.

  For pipe products such as valves, strainers, fittings, and pipes, which are connected to various types of tubular products and pipes, prevent foreign substances from entering the product from the pipe end, and seal gasket seats at the pipe end. Pipe end protections are used to protect surfaces.

  As a conventional protection device for a pipe end, for example, a sheet-like protection device is known in which one side is an adhesive surface and is attached to the pipe end so as to cover an opening of the pipe end, a sealing surface of a flange, and the like. (For example, see Patent Document 1).

  Further, a flange-shaped tube end protection portion is provided on one end side of the short cylinder portion inserted into the tube end portion, and a plurality of elastic protruding pieces are erected on the outer periphery of the short cylinder portion, and a Known are those made of iron plate or resin in which a plurality of elastic protruding pieces are detachably engaged with the inner peripheral wall of the tube end when attached (for example, see Patent Documents 2 and 3).

  Further, a disk-shaped cover portion for closing the opening of the tube end portion with the flange, and a plurality of chamfered friction fitting portions each of which is pushed into the plurality of bolt holes of the flange with fingers or the like are integrally formed. Those made of polyethylene resin are also known (for example, see Patent Document 4).

JP-A-2002-161993 JP-A-10-231988 JP 2013-40644 A U.S. Pat. No. 4,014,368

  However, since the conventional sheet-shaped tube-end protection device attached to the tube end has a relatively low strength, the tube-end protection device may be broken depending on the mode of transport of the product. The function of preventing foreign matter from entering the inside may be impaired, and the seal may break when peeled from the end of the pipe or the adhesive may remain on the seal surface, resulting in a gasket or other seal. In addition, rust-proof oil applied to the inner peripheral wall of the valve housing made of ductile cast iron etc., which forms the liquid flow path, should be confined in various valves, etc. However, there is a possibility that rust-preventive oil leaks and soils floors and the like.

  On the other hand, in conventional pipe end protectors made of resin or iron plate, there is a cylindrical tubular gap between the peripheral surface of the bottomed short cylindrical portion and the inner peripheral wall forming the fluid passage. Will do. In particular, when a product-side main body having a pipe end is cast, the inner diameter of the inner peripheral wall surface or the fluid passage tends to fluctuate. When the protection part does not adhere to the annular end face of the pipe end easily occurs, and when the flange-shaped pipe end protection part does not adhere to the annular end face of the pipe end, small-diameter foreign matter and dust enter the fluid passage. There was a risk of it.

  Further, when a relatively low-viscosity oil (liquid) such as rust-preventive oil is attached, for example, when a product-side main body having a pipe end is cast, a flange-shaped pipe end protection section is provided. It is almost impossible to contain oil due to close contact with the annular end surface of the tube end, and there has been a problem that oil leaks from the tube end and the sealing surface of the tube end protection portion is contaminated by deposits.

  Further, in the case of a conventional pipe end protector in which a plurality of friction fitting portions are pushed into a plurality of bolt holes, there are difficulties in terms of versatility and ease of attachment and detachment.

  The present invention has been made in order to solve such a conventional problem, and has sufficient strength to exhibit a required protection function. An object of the present invention is to provide a pipe end protector and a piping product having excellent sealing properties and detachability.

In order to achieve the above object, a pipe end protector according to the present invention is a pipe end detachably mounted on a pipe end having an inner peripheral wall surface forming a fluid passage and an annular end surface intersecting the inner peripheral wall surface. A part protector, comprising: a tubular part having a closed internal space inserted into the pipe end; and projecting radially outward at a plurality of locations in a circumferential direction from an outer peripheral surface of the tubular part. An outer projection for preventing the tubular portion from being elastically displaced inward in the radial direction when the tubular portion is inserted into the tube end, and being pressed against the inner peripheral wall surface of the tube end. An annular flange portion integrally formed on the cylindrical portion so as to face the annular end surface of the tube end portion while being spaced apart from the outer protrusion in a central axis direction of the cylindrical portion; and It is located between the outer projection and the annular collar in the axial direction, and has a radius larger than the fluid path on the annular collar side. Has an inclined outer peripheral tapered surface as comprising a tapered seal portion to engage the outer peripheral tapered surface on the end peripheral portion of said fluid passage of said tube end, and
The annular collar portion has a pedestal portion protruding in the central axis direction on one surface facing the annular end surface of the tube end portion or the other surface opposite to the annular end surface, and the pedestal portion has the annular collar portion. When receiving a vertical load from the outside while being attached to the pipe end, the pipe has a vertical load receiving surface supporting the annular end face in a plane parallel to the annular end face .

  With this configuration, according to the present invention, even if the fluid passage diameter of the tube end into which the tubular portion is inserted varies, when the tubular portion is inserted into the tube end, the radius is larger than that of the retaining projection. The large tapered seal portion presses against the peripheral edge portion of the fluid passage at the pipe end within the range of the outer peripheral tapered surface, so that the fluid passage at the pipe end can be reliably sealed. In addition, since the outer projection presses against the inner peripheral wall surface of the pipe end and the tapered seal portion engages the outer tapered surface with the end peripheral portion of the fluid passage at the pipe end, the pipe end protector is provided. Can be easily attached to the end of the tube and can be reliably positioned. In addition, the thickness and rigidity of the annular flange that separates the gap from the annular end surface of the pipe end are not particularly limited, and the pipe end protector can be easily used from the pipe end by using this annular collar. Can be removed. As a result, it has sufficient strength to exhibit the required protection function, and has excellent sealability to the pipe end even if the fluid passage diameter at the pipe end varies, and has good detachability. Becomes

  In the pipe end protection device of the present invention, the annular collar portion has a pedestal portion protruding in the central axis direction on one surface facing the annular end surface of the tube end portion or on another surface opposite to the annular end surface. A pedestal capable of supporting the pipe end at least at a plurality of circumferential positions of the annular end face via the pedestal portion when a vertical load is applied from the outside at the time of attachment to the pipe end. Is also good.

  With this configuration, when a product having a pipe end is placed on a floor surface or a support surface during transportation with the pipe end facing downward, the pipe end protection device is provided with a pipe end sealing surface or the like. It can function as a pedestal that stably supports the annular end face and the peripheral edge portion of the fluid passage in a state where it is hard to be damaged. In particular, when the pedestal function is exhibited, the tapered seal portion is fitted to the inner peripheral wall surface forming the fluid passage at the pipe end so as to be in close contact with the entire circumference, so that the pipe end protection device is provided. Is reliably positioned with respect to the pipe end, and the pedestal portion is a pedestal capable of supporting the pipe end at least at a plurality of locations in the circumferential direction of the annular end face, so that the fluid passage of the product having the pipe end Is perpendicular to the seating surface passing through the plurality of pedestals, so that the support posture of the product having the pipe end is stabilized, that is, the product can be held in a good sitting position.

  The pedestal portion of the annular collar portion may be an annular rib projecting annularly in the central axis direction on a radially outer peripheral side of the other surface.

  With this configuration, the mounting posture of the pipe end protection device is not limited to the product having the pipe end, and the pedestal function is further improved.

  The annular collar further includes, on the outer periphery of the annular collar, an annular extension collar that is extended without a step from a surface facing the annular end surface of the annular collar, and a corresponding region of the annular collar opposite to the pedestal portion. The surface facing the annular end surface of the extended collar portion is smoothly connected to the surface facing the annular end surface of the extended flange portion without any step, and at least the surface facing the annular end surface of the extended collar portion in a mounted state that does not adhere to the annular end surface is a required clearance. It is preferable to have a configuration having corners.

  With this configuration, in addition to the technical effects described above, a pipe end protection device is attached to the product having the tube end at a stage where the product is not sufficiently and sufficiently applied to the tube end, and the pipe end is attached to the bottom plate. Even when the protective device is placed under the protective device and the pipe-end protective device is placed, the phenomenon in which the paint gathers around the tube end and swells up in an annular shape is suppressed.

  In order to achieve the above object, the pipe product of the present invention is one of a valve and a pipe joint having a pipe end having an inner peripheral wall surface forming a fluid passage and an annular end surface intersecting the inner peripheral wall surface. And the pipe end of the pipe product main body is provided with any one of the pipe end protectors described above.

  With this configuration, according to the present invention, even if there is a variation in the diameter of the fluid passage at the pipe end of the pipe product body including the valve and the pipe joint, the pipe end protector having sufficient strength to exhibit a required protection function. When the cylindrical portion of the tube is inserted into the end of the tube, the tapered seal portion of the protector for the end of the tube presses against the peripheral portion of the end of the fluid passage at the end of the tube so that the fluid passage at the end of the tube can be reliably sealed. become. In addition, since the outer projection of the pipe end protector presses against the inner peripheral wall surface of the pipe end, and the tapered seal portion engages the outer peripheral tapered surface with the end peripheral portion of the fluid passage at the pipe end. In addition, the pipe end protector can be easily attached to the pipe end of the piping product and can be reliably positioned. In addition, the thickness and rigidity of the annular flange of the pipe end protector for separating the gap from the annular end surface of the pipe end of the pipe product body are not particularly limited. The part protector can be easily removed from the tube end.

  ADVANTAGE OF THE INVENTION According to this invention, while having sufficient intensity | strength which can exhibit the required protection function, even if the opening diameter of a pipe end part varies, the pipe end part protector which is excellent in the sealing property with respect to the pipe end part and the detachability. And plumbing products can be provided.

It is a perspective view showing a pipe end part protector concerning a 1st embodiment of the present invention. 1 is a partial cross-sectional view of a gate valve equipped with a pipe end protection device according to a first embodiment of the present invention. FIG. 3 is a partial cross-sectional view of the pipe end protector and the gate valve according to the first embodiment of the present invention, wherein the tubular portion of the pipe end protector is inserted before the tubular portion corresponds to the fluid passage of the gate valve. It is a figure showing the state of. FIG. 2 is a partial cross-sectional view of the pipe end protection device and the gate valve according to the first embodiment of the present invention, showing a state where the tubular portion of the tube end protection device is being inserted into the fluid passage of the gate valve. FIG. FIG. 3 is a partial cross-sectional view of the pipe end protector and the gate valve according to the first embodiment of the present invention, wherein a tapered seal portion of the pipe end protector abuts on an end peripheral portion of the gate valve. It is a figure which shows the state which liquid-sealed. FIG. 3 is a partial cross-sectional view of the pipe end protection device and the gate valve according to the first embodiment of the present invention, wherein the pipe end protection device is mounted on the gate valve, It is a figure which shows the attitude | position at the time of attachment to a part, and the deformation | transformation state of the protective equipment for pipe ends. It is a fragmentary sectional view showing a pipe end part protection device concerning a 2nd embodiment of the present invention. FIG. 10 is a partial perspective view showing a pipe end protection device according to a third embodiment of the present invention. FIG. 13 is a partial perspective view showing a pipe end protection device according to a fourth embodiment of the present invention. It is a partial perspective view showing a pipe end part protective equipment concerning a 5th embodiment of the present invention. It is a perspective view showing a pipe end part protector concerning a 6th embodiment of the present invention. FIG. 14 is a partial cross-sectional view of a gate valve equipped with a pipe end protection device according to a sixth embodiment of the present invention. FIG. 14 is a partial cross-sectional view of a pipe end protector and a gate valve according to a sixth embodiment of the present invention, in a state where the pipe end protector having an extended flange portion is attached to the gate valve; It is a figure which shows the attitude | position at the time of attachment to the pipe end part of the said gate valve, and the deformation | transformation state of the pipe end part protective equipment. It is a figure for explaining the effect of the pipe end part protective equipment concerning a 6th embodiment of the present invention, and (a) Drawing shows swelling of rust prevention paint which occurs when an extension brim is not provided. It is a figure and (b) is a figure which shows the place where swelling of a rust prevention paint does not arise by providing an extension brim part. FIG. 14 is a partial cross-sectional view of a pipe end protector and a gate valve according to a seventh embodiment of the present invention, in a state where the pipe end protector having an extended brim is mounted on the gate valve; It is a figure which shows the attitude | position at the time of attachment to the pipe end part of the said gate valve, and the deformation | transformation state of the pipe end part protective equipment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a perspective view of a pipe end protector 1 according to the first embodiment.

  First, the configuration will be described.

  As shown in FIG. 1, a pipe end protection device 1 of the present embodiment includes a tubular portion 2 having a closed internal space, and an outer protrusion 3 provided integrally on an outer surface of the tubular portion 2. An annular flange 4 formed integrally with the cylindrical portion 2; a tapered seal portion 6 provided between the outer projection 3 and the annular flange 4 in the center axis direction; And a pedestal portion 7 integrally formed so as to protrude from the surface 4 in the central axis direction, and is integrally formed of a synthetic resin such as polypropylene or polyethylene.

  The pipe end protector according to the present invention is an article which is detachably attached to a pipe end having an inner peripheral wall surface forming a fluid passage and an annular end surface intersecting the inner peripheral wall surface. In the embodiment, as a product having a pipe end, as shown in FIG. 2, a gate valve 30 is exemplified, and in the following description, each component of the above-described pipe end protection device 1 according to the present invention will be described. The description will be made in relation to the gate valve 30 which is a piping product. The product having a pipe end includes various valves other than the gate valve, and further includes a strainer, various pipe joints, and the like.

  The gate valve 30 includes a valve housing 31, a valve body 33, a valve rod 34, a lid 35, a yoke 36, a handle wheel 37, and a liquid seal member 38. The valve stem 34 is composed of a plurality of parts, has a length changing function using a screw mechanism, and is connected to the steering wheel 37 and the valve body 33. The valve housing 31 and the lid 35 are made of ductile cast iron. At the manufacturing stage of the valve housing 31, rust-preventive oil is coated on the inner peripheral wall surface forming the cylindrical fluid passage 31a.

  The gate valve 30 functions to reduce the function of changing the length of the valve rod 34 by rotating the handle wheel 37 in one direction, thereby separating the valve body 33 from the valve seat in the valve housing 31 and opening the valve. By rotating the handle wheel 37 in the other direction, the function of extending the length of the valve rod 34 is extended, and the valve body 33 is brought into close contact with the valve seat in the valve housing 31, The valve can be closed.

  The valve housing 31 has flange portions 31c at both ends, and a fluid passage 31a penetrates through the flange portions 31c. The valve housing end portion 32 including the flange portion 31c corresponds to the pipe end portion of the present invention, the end surface of the flange portion 31c corresponds to the annular end surface of the present invention, and the fluid passage 31a extends through the flange portion 31c. Corresponds to the opening of the present invention, and the wall surface forming the fluid passage 31a corresponds to the inner peripheral wall surface of the present invention. The center line of the fluid passage 31a and the inner peripheral wall forming the fluid passage 31a intersect at right angles with the end surface of the flange portion 31c.

  Hereinafter, with reference to FIG. 1 and FIG. 2, each component of the pipe end protection device 1 of the present embodiment will be described.

  The pipe end protection device 1 is attached to both ends of the gate valve 30. The cylindrical portion 2 has a cylindrical shape including a cylindrical portion main body 2a and an end closing portion 2b, and a depth end of an in-cylinder space is closed, and a fluid passage 31a is formed through an opening of a flange portion 31c of the gate valve 30. The outer diameter of the fluid passage 31a is formed, for example, by 1 to 2 mm smaller than the minimum diameter of the fluid passage 31a due to variations at the time of manufacturing the gate valve 30. The thickness of the cylindrical portion 2 is, for example, 1 mm.

  The outer projection 3 projects radially outward at a plurality of locations (four in the figure) in the circumferential direction from the outer peripheral surface of the tubular portion 2, and the tubular portion 2 forms an opening in the flange portion 31 c of the gate valve 30. When inserted into the fluid passage 31a, the retaining function is such that it is elastically displaced inward in the radial direction and presses into engagement (inner diameter chuck) with the inner peripheral wall surface 31b forming the fluid passage 31a of the gate valve 30. Having. The thickness of the outer peripheral portion 3 of the cylindrical portion 2 around the outer peripheral portion 3 is such that when the outer peripheral portion 3 is chucked for the inner diameter, the outer convex portion 3 exerts a spring force while retracting in the central axis direction of the cylindrical portion 2 so as to exhibit an inner peripheral wall surface. 31b so as to be in pressure contact engagement therewith. The outer protruding portion 3 is provided on the cylindrical portion 2 so as to protrude, for example, by 1 to 3 mm larger than the maximum diameter of the fluid passage 31 a due to variations at the time of manufacturing the gate valve 30.

  The annular collar portion 4 is integrally formed in a flange shape on the opposite side of the cylindrical portion 2 to the gate valve insertion side, and has an end surface of the flange portion 31c of the gate valve 30 (the annular end surface of the tube end of the present invention). Corresponding). The annular flange 4 has a thickness of, for example, 2 to 4 mm, and is formed to have a diameter several mm to several tens mm smaller than the outer diameter of the flange 31 c of the gate valve 30. As shown in FIG. 2, the outer shape of the annular collar portion 4 may be a size that covers the bolt hole 31d of the flange portion 31c, and may be elliptical or polygonal in addition to circular.

  The annular flange 4 and the outer protrusion 3 are spaced apart from each other by, for example, 30 mm to 40 mm in the central axis direction of the cylindrical portion 2. The tapered seal 6 is located between the outer protrusion 3 and the annular flange 4. Is provided. The tapered seal portion 6 has an outer peripheral tapered surface 5 inclined on the side of the annular flange portion 4 so as to have a larger radius than the fluid passage 31 a. The outer peripheral tapered surface 5 is formed on the periphery of the end portion of the fluid passage 31 a of the gate valve 30. The portion 31e is provided so as to be engaged with the entire periphery in close contact. The tapered seal portion 6 has an appropriate angle avoiding a small taper angle that is strongly fitted by a wedge action when engaging with the inner peripheral wall surface 31b forming the fluid passage 31a of the gate valve 30, for example, 5 to 45 °. The taper angle may be formed so as to have a taper angle of 15 to 25 °.

  Although the tapered seal portion 6 is integrally formed in the present embodiment, the tapered seal portion 6 is separated from the cylindrical portion 2 and the annular flange portion 4 and is separated into a separate rubber part or a plurality of independent resin parts. It is also possible to adopt a configuration in which a divided body is formed such that a ring is formed by a plurality of divided bodies and is sealed with the annular collar portion 4. Further, the outer projection 3 and the annular tapered seal portion 6 are separated from the cylindrical portion 2 and the annular flange portion 4 to be separate rubber parts, and the tapered seal portion 6 is fitted to the cylindrical portion 2. The outer protrusion 3 may be configured to be fitted into the hole of the tubular portion 2 from the above. Furthermore, the tapered seal portion 6 may be formed by a round surface having a radius corresponding to the taper angle.

  The pedestal portion 7 is a radially outer peripheral side of the other surface opposite to one surface facing the end surface 31d (corresponding to the annular end surface of the tube end of the present invention) of the flange portion 31c of the gate valve 30, and the other surface. It is an annular rib projecting more in the direction of the central axis. A circular region 41 of the annular collar portion 4 between the tapered seal portion 6 and the pedestal portion 7 is a bending region. By providing the pedestal portion 7, when a vertical load is applied from the outside to the annular collar portion 4 when the annular collar portion 4 is attached to the pipe end, the bending region 4 a bends and is opposite to the pedestal portion 7 of the annular collar portion 4. The outer peripheral portion on the side contacts the end face 31d of the flange portion 31c of the gate valve 30, and functions as a base capable of supporting the flange portion 31c of the gate valve 30. When the vertical load applied to the annular collar portion 4 is removed from the outer peripheral portion of the annular collar portion 4, the flexure region 4a returns to a planar shape, and a gap is formed with the flange portion 31c of the gate valve 30.

Next, the operation will be described with reference to FIGS.
As shown in FIGS. 3 and 4, rust prevention oil L is applied to an inner peripheral wall surface 31 b forming a fluid passage 31 a of the gate valve 30. In order to attach the pipe end protection device 1 to the gate valve 30, as shown in FIG. 3, the center line of the fluid passage 31a of the gate valve 30 is made horizontal, and the fluid passage 31a of the pipe end protection device 1 is set. The tubular portion 2 is concentrically opposed to the fluid passage 31a of the gate valve 30, and then, as shown in FIG. 4, the tubular portion 2 is inserted into the fluid passage 31a.

  At this time, since the peripheral portion of the outer protrusion 3 has a reduced thickness, the outer protrusion 3 comes into contact with the inner peripheral wall surface 31b forming the fluid passage 31a at the inlet of the fluid passage 31a. It can be displaced in the direction of the center line of the cylindrical portion 2 and exerts a spring force for restoring the shape, and projects against the inner peripheral wall surface 31b and slides on the inner peripheral wall surface 31b. The deformation of the outer projection 3 does not change the shape of the tapered seal 6.

  Subsequently, as shown in FIG. 5, the outer peripheral tapered surface 5 of the tapered seal portion 6 corresponds to the inner peripheral edge of the inlet of the fluid passage 31 a of the gate valve 30 (corresponding to the peripheral edge of the inner peripheral wall surface of the pipe end of the present invention). Push it in until it touches. Since the maximum diameter of the outer peripheral tapered surface 5 of the tapered seal portion 6 is larger than the maximum diameter due to manufacturing variations of the fluid passage 31a of the gate valve 30, the entire middle of the outer peripheral tapered surface 5 is formed at the inlet of the fluid passage 31a. It contacts the inner periphery.

  As a result, the tapered seal portion 6 is in a state in which the fluid passage 31a is liquid-sealed, and the plurality of outer projections 3 chuck the inner peripheral wall surface 31b of the gate valve 30 with the inner diameter. Is done. Further, since the entire middle of the outer peripheral tapered surface 5 abuts on the inner peripheral edge of the inlet of the fluid passage 31a, a gap is formed between the annular flange 4 and the flange 31c of the gate valve 30. This gap can also be used as a gap in which a toy can be inserted when the pipe end protection device 1 is removed from the gate valve 30.

  As shown in FIG. 2, transportation of the gate valve 30 having the pipe end protection device 1 attached to both ends of the fluid passage 31a in a warehouse or in a distribution process is performed such that the fluid passage 31a is vertically oriented. A plurality of valves 30 are placed on the bottom plate P and arranged in two or three layers. FIG. 6 shows a state in which the gate valve 30 is placed on the floor plate P such that the fluid passage 31a is in the vertical direction.

  As shown in FIG. 6, the pipe end protection device 1 comes into close contact with the end peripheral portion 31 e of the valve housing end portion 32 in the middle of the outer peripheral tapered surface 5 of the tapered seal portion 6 to form the fluid passage 31 a. Since it is closed, it is possible to prevent the rust-preventive oil L descending from the initial application position by gravity action from leaking out.

  In addition, since the annular flange 4 corresponds to the end face of the flange 31c of the gate valve 30, the pipe end protector 1 protects the end face of the flange 31c from contamination and stably supports it. It can function as a pedestal.

  The pedestal portion 7 receives a vertical pressure from the floor plate P due to a reaction force from the floor plate P against the own weight of the gate valve 30. Therefore, a bending region 4a, which is an annular region in the middle of the annular flange portion 4, is formed. The flange portion 31c is elastically deformed, the outer peripheral portion of the annular flange portion 4 is in close contact with the outer peripheral portion of the end surface of the flange portion 31c, and the annular pedestal portion 7 is brought into close contact with the sole plate P all around.

  In this way, the pedestal portion 7 functions as a pedestal with the bottom plate P and the tapered seal portion 6 kept in a non-contact state, whereby the support posture of the gate valve 30 is stabilized, that is, the pedestal portion 7 Good sitting can be maintained.

  As described above, according to the pipe end protector 1 according to the present embodiment, the diameter of the fluid passage 31a of the valve housing end (tube end) 32 into which the tubular portion 2 is inserted varies. Even if the cylindrical portion 2 is inserted into the fluid passage 31a, the tapered seal portion 6 having a larger radius than the outer protrusion 3 for retaining the end portion of the fluid passage 31a within the outer peripheral tapered surface 5 thereof. By pressing against the peripheral portion 31e, the fluid passage 31a of the valve housing end 32 can be reliably sealed.

  Moreover, the outer projection 3 is pressed against the inner peripheral wall surface 31b of the valve housing end 32, and the tapered seal portion 6 engages the outer tapered surface 5 with the end peripheral portion 31e of the fluid passage 31a of the valve housing end 32. Therefore, the pipe end protection device 1 can be easily attached to the valve housing end 32 and can be reliably positioned. In addition, the thickness and rigidity of the annular flange portion 4 that separates the gap from the annular end surface 31d of the valve housing end portion 32 are not particularly limited. It can be easily removed from the valve housing end 32. As a result, while having sufficient strength to exert the required protection function, even if the diameter of the fluid passage 31a of the valve housing end 32 varies, the sealing performance with respect to the fluid passage 31a of the valve housing end 32 is excellent. The pipe end protector 1 has good detachability.

  A gate valve 30, which is a plumbing product according to the present embodiment, includes a valve housing end (pipe end) 32 having an inner peripheral wall surface forming a fluid passage 31a and an annular end surface intersecting the inner peripheral wall surface. Since the end protection device 1 is provided, even if the fluid passage diameter of the valve housing end portion 32 varies, the cylindrical shape of the pipe end protection device 1 having sufficient strength to exert a required protection function. When the portion 2 is inserted into the valve housing end 32, the tapered seal portion 6 of the pipe end protector 1 comes into pressure contact with the end peripheral portion of the fluid passage 31 a of the valve housing end 32, and the valve housing end 32 is closed. The fluid passage 31a can be reliably sealed.

  In the gate valve 30, the outer protrusion 3 of the pipe end protection device 1 is pressed against the inner peripheral wall surface of the valve housing end 32, and the tapered seal portion 6 connects the outer tapered surface 5 to the fluid passage of the pipe end. The engagement with the peripheral portion of the end portion allows the pipe end protection device 1 to be easily mounted on the valve housing end portion 32 and allows reliable positioning. In addition, the thickness and rigidity of the annular flange 4 of the pipe end protection device 1 that separates the gap from the annular end surface of the valve housing end 32 of the piping product body are not particularly limited. By using, the pipe end protection device 1 can be easily removed from the valve housing end 32.

(Second embodiment)
FIG. 7 is a partial cross-sectional view showing a tube end protection device 1A according to the second embodiment.

  As shown in FIG. 7, the configuration of the pipe end protection device 1A according to the second embodiment of the present invention is the same as that of the tube according to the first embodiment described with reference to FIGS. Since the configuration is substantially the same as that of the end protection device 1, the same components as those of the tube end protection device 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Only the specific configuration will be described.

  The pipe end protection device 1A is different from the component corresponding to the tubular portion 2A, the annular collar portion 4A, and the pedestal portion 7A when compared with the tube end protection device 1 according to the first embodiment. ing.

  As shown in FIG. 7, the cylindrical portion 2A has a cylindrical shape having a closed internal space, which includes a cylindrical portion main body 2a and an intermediate portion closing portion 2c. The annular plate portion 4a, the outer annular plate portion 4b, and the intermediate annular region between the inner annular plate portion 4a and the outer annular plate portion 4b occupy a radial cross section. And an easy bending portion 4c integrally connecting the inner circumferential side annular plate portion 4a and the outer circumferential side annular plate portion 4b. The easily bendable portion 4c has a gap between the flange portion 31c and the outer annular plate portion 4b when the pipe end protection device 1A is attached to the gate valve 30 shown in FIG. The inner circumferential side annular plate portion 4a and the outer circumferential side annular plate portion 4b are connected so that the required size is larger than the gap between the annular ring portion 4a. The bending region 41A includes the easily bent portion 4c.

  The pedestal portion 7A is located in a gap between the flange portion 31c and the outer peripheral side annular plate portion 4b, and is formed into a thick annular plate shape integrally with the outer peripheral side annular plate portion 4b. The base portion 7A has a gap between itself and the flange portion 31c when the pipe end protection device 1A is attached to the gate valve 30. The pedestal portion 7A may be provided as a separate component instead of being provided integrally with the annular collar portion 4A.

  When a vertical load is applied from the outside, the annular collar 4A receives the vertical load on the outer peripheral side annular plate 4b, and the easy bending portion 4c bends, so that the pedestal portion 7A comes into close contact with the flange portion 31c. It functions as a pedestal.

(Third embodiment)
As shown in FIG. 8, the configuration of the pipe end protection device 1B according to the third embodiment of the present invention is substantially the same as the configuration of the tube end protection device 1 according to the first embodiment. Therefore, the same configuration as the configuration of the tube end protection device 1 according to the first embodiment is denoted by the same reference numeral, and the description thereof will be omitted, and only the specific configuration will be described. The pipe end protector 1B is different from the component corresponding to the pedestal portion 7B when compared with the pipe end protector 1 according to the first embodiment.

  The pedestal portion 7B is, like the pedestal portion 7 shown in FIG. 1, distributed in a long ridge portion and a short ridge portion so as to be parallel to each other in a region on the outer peripheral side of the same side surface of the annular collar portion 4. It is provided. The bending region 41B is a circular region inscribed in two long ridges and two short ridges. The pedestal portion 7B is provided with a required thickness. That is, the pipe end protector 1B is attached to the flange 31c of the pipe end 32 of the gate valve 30 shown in FIG. 2, and adheres to the floor plate P shown in FIG. When received, due to the thickness of the pedestal portion 7B, the rear side surface portion of each pedestal portion 7B of the annular collar portion 4 comes into close contact with the flange portion 31c shown in FIG. It is possible to maintain a state that does not adhere to P. For this reason, since the center line of the fluid passage of the gate valve 30 is perpendicular to the floor plate P, the pedestal portion 7B has a pedestal function in which the seating is stable.

  The pedestal portion 7B is provided as a long large ridge in a region deviating from the center of the annular collar portion 4, and as a short ridge in a region passing through the center of the annular collar portion 4, excluding the central region. . The reason that the pedestal portions 7B are not provided in the inner peripheral side region is that all the pedestal portions 7B are attached when the annular flange portion 4 is vertically adhered to the flange portion shown in FIG. This is because the passing surface does not become one plane, and the pedestal function becomes unstable.

(Fourth embodiment)
As shown in FIG. 9, the configuration of the pipe end protector 1C according to the fourth embodiment of the present invention is substantially the same as the configuration of the pipe end protector 1 according to the first embodiment. Therefore, the same configuration as the configuration of the tube end protection device 1 according to the first embodiment is denoted by the same reference numeral, and the description thereof will be omitted, and only the specific configuration will be described. The pipe end protector 1C is different from the component corresponding to the pedestal portion 7C when compared with the pipe end protector 1 according to the first embodiment.

  The pedestal portion 7C is provided on the surface on the same side of the annular collar portion 4 as a plurality of small rectangular protrusions extending radially from the center in four equally spaced positions in the circumferential direction. The bending area 41C is a circular area inscribed in the four rectangular ridges. The pedestal portion 7C, which is a quadrangular ridge, has a required thickness and is provided in a region on the outer peripheral side of the annular flange 4 with a required thickness. That is, the pipe end protector 1C is attached to the flange 31c of the pipe end 32 of the gate valve 30 shown in FIG. 2, and adheres to the floor plate P shown in FIG. When received, due to the thickness of the pedestal portion 7C, the bending region 41C bends and the back side surface portion of each pedestal portion 7C of the annular collar portion 4 comes into close contact with the flange portion 31c shown in FIG. Can be maintained in a state in which the inner peripheral portion of the base member does not adhere to the floor plate P. For this reason, since the center line of the fluid passage of the gate valve 30 is perpendicular to the floor plate P, the pedestal portion 7C has a pedestal function in which the seating is stable.

(Fifth embodiment)
As shown in FIG. 10, the configuration of a pipe end protector 1D according to the fifth embodiment of the present invention is substantially the same as the configuration of the pipe end protector 1 according to the first embodiment. Therefore, the same configuration as the configuration of the tube end protection device 1 according to the first embodiment is denoted by the same reference numeral, and the description thereof will be omitted, and only the specific configuration will be described. The pipe end protector 1D is different from the pipe end protector 1C according to the fourth embodiment only in the shape of the pedestal portion 7D provided on the annular flange 4.

  The pedestal portion 7D is provided in the circumferential region on the same side surface of the annular flange portion 4 as a circular convex portion having a required thickness in the circumferential direction and equally divided into four parts. The bending area 41D is a circular area inscribed in the four circular ridges. When the four pedestal portions 7D come into close contact with the sole plate P shown in FIG. 2 and receive a vertical load, the back side surface portions of the respective pedestal portions 7D of the annular collar portion 4 are changed to FIG. 2 due to the thickness of the pedestal portion 7D. It has such a thickness that it can be kept in close contact with the flange portion 31c shown in FIG. For this reason, since the center line of the fluid passage of the gate valve 30 is perpendicular to the floor plate P, the pedestal portion 7D has a pedestal function in which the seating is stable.

(Sixth embodiment)
As shown in FIGS. 11 to 14, the pipe end protector 1E according to the sixth embodiment of the present invention has a pedestal portion as compared with the pipe end protector 1 according to the first embodiment. The shape of the outer peripheral portion of the annular flange portion 4E including the flange portion 7E is different, and the other configuration is substantially the same as the configuration of the pipe end protection device 1 according to the first embodiment. The same reference numerals as in the pipe end protection device 1 according to the embodiment denote the same parts, and a description thereof will be omitted.

  The annular collar portion 4E has an annular pedestal portion 7E protruding in the center axis direction on an outer peripheral portion of the other surface opposite to the flange portion 31c of the gate valve 30, and is outwardly attached to the flange portion 31c. When a vertical load is applied from the base member, an annular pedestal capable of supporting the flange portion 31c via the pedestal portion 7E is formed. On the outer periphery of the annular flange 4E, there is provided an annular extending flange 8 which is smoothly extended without a step with the surface 71 of the corresponding region opposite to the pedestal portion 7E of the annular flange 4E. In this embodiment, the surface 71 in the corresponding region on the opposite side to the pedestal portion 7E of the annular collar portion 4E and the surface 8a of the extension flange portion 8 on the side facing the flange portion 31c in the mounting state where the flange portion 31c is not in close contact. Have a required clearance angle θ as a smoothly connected surface.

The shape of the outer peripheral portion of the annular flange portion 4E including the pedestal portion 7E will be described.
The pedestal portion 7E is formed in an annular shape similarly to the pedestal portion 7 according to the first embodiment.

  The pipe end protection device 1E differs from the tube end protection device 1 according to the first embodiment in that the tube end protection device 1E further includes an extended flange portion 8 on the outer peripheral portion of the annular flange portion 4E. .

  In this embodiment, the extension flange 8 has a thickness equal to the thickness of the annular collar 4E at the extension base end 8b, and gradually decreases toward the outer peripheral end, and faces the flange 31c. The surface and the non-facing surface coincide at the outer peripheral end. The size of the extension flange portion 8 varies depending on the size of the gate valve 30 and the diametrical width of the flange portion 31c. For example, the length a of the extension collar 8 in the extension direction is set to 5 mm at minimum and 15 mm at maximum, and the outer diameter of the extension collar 8 is, for example, 2 to 2 mm smaller than the outer diameter of the flange 31c. The size is set to be 20 mm smaller.

The surface of the annular brim 4E including the extended brim 8 facing the flange 31c has the following features.
In FIG. 12, the dimension a indicates the width dimension (dimension in the diameter direction, the same applies hereinafter) of the surface 8a facing the flange portion 31c of the extension collar section 8, and the dimension b indicates the side opposite to the pedestal portion 7E of the annular collar section 4E. And the width dimension of the face 42 facing the flange 31c of the gate valve 30 in the inner peripheral area of the face 71 of the annular flange 4E.

  The surface 42 of the annular collar portion 4E coincides with a plane perpendicular to the axial direction of the tube end protection device 1, similarly to the annular collar portion 4 according to the first embodiment. The surface 71 of the annular flange 4E and the surface 8a of the extension flange 8 facing the flange 31c are smoothly connected without any step, and are required with respect to a plane perpendicular to the axial direction of the pipe end protection device 1. Has a clearance angle θ. It is preferable that the clearance angle θ increases toward the outer peripheral side of the extension flange 8. For example, it is preferable that the clearance is formed so as to have a clearance angle of 10 to 15 degrees at the outer peripheral portion of the extension brim portion 8.

  In FIG. 12, the start of the clearance angle θ is near the inner periphery 72 of the surface 71 of the corresponding region on the opposite side to the pedestal portion 7E. However, in FIG. 12, it is important that the surface having the clearance angle θ exists on the outer periphery of the reaction force generation region from the ground contact surface, and at least only the surface 8 a facing the flange portion 31 c of the extension collar portion 8. May be the target. In addition, the surface of the extension brim 8 on the side not facing the flange 31c is also an inclined surface so that the thickness becomes smaller toward the outer peripheral side.

  The extension flange 8 has a thickness, for example, half the thickness of the annular collar 4E at the extension base end 8b, and the surface on the side not facing the flange 31c is formed of the pipe end protection device 1. It may be a plane perpendicular to the axial direction.

  The clearance angle θ is, as shown in FIG. 13, when the pipe end protector 1E is attached to the gate valve 30 and the pipe end protector 1E is placed on the base plate P with the underlay. The annular collar portion 4E is set to have such a relationship that the surface corresponding to the back side of the pedestal portion 7E of the annular collar portion 4E is greatly parallel to the flange portion 31c in a state parallel to and closely adhered to the flange portion 31c. Good. After the pedestal portion 7E is sandwiched between the flange portion 31c and the floor plate P, the surface of the pedestal portion 7E that is in close contact with the floor plate P and the surface corresponding to the back side of the pedestal portion 7E of the annular flange portion 4 are for the pipe end. The protector 1E is elastically deformed to be in a parallel state.

The reason why the clearance angle θ is provided and the extension collar portion 8 is provided smoothly without any step is related to the outer surface coating of the gate valve 30.
The gate valve 30 is a modified alkyd resin paint (a condensate of a polybasic acid and a polyhydric alcohol, which is fast-drying at room temperature and has excellent gloss, hardness, oil resistance, and weather resistance) formed on the outer surface in the last step of manufacturing. Rust-preventive coating is performed using a resin coating modified with oil or fatty acid) so as to form a coating film having a film thickness of tens of μm to tens of μm. After the coating, natural drying is performed for about one day. As shown in (1), the pipe end protection device 1E is attached to the valve housing end (pipe end) 32 and stored in a warehouse.

  Since the modified alkyd resin coating is performed also on the outer peripheral portion of the gate valve end 30 (pipe end) 32 outside the sealing surface, the surface corresponding to the back side of the pedestal portion 7E of the annular collar portion 4E is It will adhere to the modified alkyd resin coating. Here, when the coating film is not sufficiently dried, as shown in FIG. 14A, the coating film F is applied to the load of the gate valve 30 in the pipe end protection device 1 in which the extension brim portion 8 does not exist. For example, in the gate valve shown in FIG. 2, the phenomenon that the paint is gathered along the outer periphery of the extended flange portion 8 by being pressed by a downward load F generated at the center of gravity located on the handle side and bulging in an annular shape. Occurs. For this reason, if the pipe end protector 1 is removed when the gate valve 30 is used, a large swelling of the paint is observed, and the evaluation of the product may be reduced.

  Therefore, in the pipe end protection device 1E according to the present embodiment, the extension collar portion 8 on which the load of the gate valve 30 is not applied extends outside the annular collar portion 4E without any step with the annular collar portion 4E, and the annular collar portion is provided. By providing the required clearance angle θ on the surface of the portion 4E on which the load of the gate valve 30 is applied (the surface opposite to the pedestal portion 7E) and the surface of the extension flange 8 on the side facing the flange portion 31c, FIG. As shown in (b), even if the coating film F that is not sufficiently dried and pressed by the surface of the annular flange portion 4E opposite to the pedestal portion 7E moves outward, the load on the gate valve 30 is small. The coating film F moving outward can be leveled by the extended brim portion 8 which is only hung, and a large swelling of the paint as shown in FIG. Do not Door can be.

  Note that, as a modification of the sixth embodiment, the extended collar portion 8 may be extended with a required clearance angle θ without a step with respect to the annular collar portion 4E. It may be extended radially outward while keeping the thickness.

(Seventh embodiment)
As shown in FIG. 15, the pipe end protector 1F according to the seventh embodiment of the present invention includes a pipe end protector 1 according to the first embodiment on an annular flange 4F. There is no pedestal portion corresponding to the pedestal portion 7 provided, and instead, the annular collar portion 4F is formed to be thick to include the thickness of the pedestal portion, and when assembled to the gate valve 30, the annular collar portion is formed. The portion 4F is provided in close contact with the flange portion 31c.

  On the outer periphery of the tube end protection 1F, there is provided an annular extension flange 8F that is smoothly extended without any step with the contact surface 43 of the flange portion 31c of the annular collar 4F. The surface 8a of the extension brim portion 8F on the side facing the flange portion 31c is a surface smoothly connected to the contact surface 43 and has a required clearance angle θ. The starting point of the clearance angle θ may coincide with the extension base end 8b of the surface 8a on the side facing the flange portion 31c of the annular collar portion 4F and the flange portion 31c of the extension collar portion 8F. Therefore, the extension collar portion 8F is provided the same as the extension collar portion 8 of the pipe end protection device 1E according to the sixth embodiment of the present invention.

  Other configurations of the pipe end protector 1F are substantially the same as the configuration of the pipe end protector 1 according to the first embodiment, and thus the pipe end protector 1F according to the first embodiment. The same reference numerals as those of the protective equipment 1 are attached and the description is omitted.

  In the seventh embodiment, the annular flange 4F is formed to have a large thickness so as to also serve as a pedestal, and the extended flange 8F is provided. The pipe end protection devices 1A to 1D according to the fifth embodiment include a modification in which an extended collar portion is provided on the outer periphery of the annular collar portion.

  As described above, the pipe end protection device and the pipe product according to the present invention have sufficient strength to exhibit a required protection function, and even if the opening diameter of the tube end varies. It has the effect of being excellent in the sealing property and the detachability with respect to the pipe end, and is useful for pipe end protection equipment and piping products in general.

1, 1A, 1B, 1C, 1D, 1E, 1F: Pipe end protection device 2, 2A: Cylindrical portion 3: Outer projection 4, 4A, 4E, 4F: Annular flange portion 5: Outer peripheral tapered surface 6: Tapered seal part 7, 7A, 7B, 7C, 7D, 7E: Pedestal part 8, 8F: Extended flange part 8a: Surface facing the flange part of extended collar part 30: Gate valve (piping product)
31a: fluid passage 31b: inner peripheral wall surface 31c: flange portion 31d: end surface of flange portion (annular end surface of pipe end)
31e: peripheral portion of end 32: valve housing end (pipe end)
71: Surface corresponding to the side opposite to the pedestal portion of the annular collar portion θ: Escape angle

Claims (4)

A pipe end protector detachably attached to a pipe end having an inner peripheral wall surface forming a fluid passage and an annular end surface intersecting the inner peripheral wall surface,
A tubular portion in which the in-cylinder space inserted into the pipe end is closed,
Projects radially outward at a plurality of locations in the circumferential direction from the outer peripheral surface of the tubular portion, and is elastically displaced inward in the radial direction when the tubular portion is inserted into the tube end. An outer protrusion for preventing the pipe from being engaged with the inner peripheral wall surface of the pipe end while being pressed,
An annular flange formed integrally with the cylindrical portion so as to face the annular end surface of the tube end while being spaced apart from the outer protrusion in the central axis direction of the cylindrical portion;
An outer peripheral tapered surface that is located between the outer protrusion and the annular collar in the center axis direction and that is inclined so that a radius is larger than the fluid path on the annular collar side is provided. A tapered seal portion to be engaged with an end peripheral portion of the fluid passage at the pipe end;
Equipped with a,
The annular collar portion has a pedestal portion protruding in the central axis direction on one surface facing the annular end surface of the pipe end portion or on the other surface opposite to the annular end surface,
The pedestal portion supports the annular end surface with a surface parallel to the annular end surface when a vertical load is applied from the outside while the annular collar portion is attached to a tube end. Pipe end protection. 2. The pipe end protection according to claim 1 , wherein the pedestal portion of the annular collar portion is an annular rib protruding annularly in the center axis direction on a radially outer peripheral side of the other surface. 3. Utensils. The annular collar further includes, on the outer periphery of the annular collar, an annular extension collar that is extended without a step from a surface facing the annular end surface of the annular collar, and a corresponding region of the annular collar opposite to the pedestal portion. The surface facing the annular end surface of the extension collar portion is smoothly connected to the surface facing the annular end surface of the extension flange portion without any step, and at least the surface facing the annular end surface of the extension collar portion in a mounting state that does not closely contact the annular end surface is a required clearance. The pipe end protection device according to claim 1 , wherein the protection device has a corner. A valve having a pipe end having an inner peripheral wall surface forming a fluid passage and an annular end surface intersecting the inner peripheral wall surface, a plumbing product main body including any one of a pipe joint,
A piping product, comprising the pipe end protection device according to any one of claims 1 to 3 at the pipe end of the piping product body.

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