Corrugated pipe bell and spigot structure and bell and spigot mold

Abstract

The utility model relates to the field of pipes, in particular to a corrugated pipe bell and spigot structure and a bell and spigot mold. Comprising a bellmouth end and a spigot end which are connected to the two ends of the straight pipe, the outer diameter of the bellmouth end is larger than the outer diameter of the straight pipe by 12 mm-15 mm, the concave-convex difference of the inner surface of the bellmouth end is 0.3 mm-0. 4 mm, the distance between the inner wall of the bellmouth end and the trough of the spigot end is smaller than the width of an SN4 sealing ring by 1 mm-3mm, and the distance between two adjacent corrugations of the spigot end is smaller than the thickness of the SN4 sealing ring by 1 mm-3mm. By implementing the scheme, the problem that the bell and spigot of an existing corrugated pipe is prone to being broken is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pipe material, concretely relates to bell and spigot structure and spigot mould of corrugated pipe. BACKGROUND

[0002] The corrugated pipe includes a cylindrical straight pipe, a plurality of annular reinforcing ribs (corrugations) are arranged on the outer surface of the straight pipe, the wall thickness of the corrugated pipe is the thickness of the straight pipe, in order to facilitate the connection of two corrugated pipes, a bell is arranged at one end of the corrugated pipe, and a spigot is arranged at the other end, the port diameter of the bell is locally enlarged, the inner diameter of the bell is larger than the outer diameter of the spigot end, when the corrugated pipe is installed and connected, the spigot of the corrugated pipe is inserted into the bell of the other corrugated pipe, and an annular sealing ring is arranged between the two ports.

[0003] In actual use, there are always problems of cracking and damage at the bell, and problems of damage of the peaks of the pipe material, the applicant finds through investigation and analysis that there are mainly two reasons: on the one hand, due to the high size difference (usually about 30mm) between the outer diameter of the bell end and the outer diameter of the corrugated pipe, the bell end is easily deformed by extrusion during transportation or handling, in addition, the bell end is also easily damaged by throwing during handling or loading and unloading (as shown in the figure); on the other hand, during on-site installation, for the corrugated pipes of the DN300 and DN400 series, the construction personnel are prone to mix the SN4 sealing ring and the SN8 sealing ring, the width difference between the two is 10-14mm, if the SN4 sealing ring is used incorrectly as the SN8, the bell and spigot will be damaged, and vice versa, the sealing will be not tight. Figure 4 、 Figure 5

[0004] In summary, a structure capable of effectively reducing the damage of the bell and spigot is needed. UTILITY MODEL CONTENTS

[0005] The utility model intends to provide bell and spigot structure and spigot mould of corrugated pipe, to solve the problem that the bell and spigot of the existing corrugated pipe is easy to break.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme: the bell and spigot structure of the corrugated pipe includes a bell end and a spigot end connected at two ends of a straight pipe, the outer diameter of the bell end is greater than the outer diameter of the straight pipe by 12mm-15mm, the concave-convex difference of the inner surface of the bell end is 0.3mm-0.4mm, the spacing between the inner wall of the bell end and the wave trough of the spigot end is less than the width of the SN4 sealing ring by 1.5mm-3mm, and the spacing between the adjacent two corrugations of the spigot end is less than the thickness of the SN4 sealing ring by 1.5mm-3mm.

[0007] Preferably, as an improvement, the outer diameter of the spigot end is less than the outer diameter of the straight pipe by 9mm-10mm.

[0008] ​Preferably, as an improvement, the outer diameter of the socket end is 12mm larger than the outer diameter of the straight pipe.

[0009] Preferably, as an improvement, the socket end has a concave-convex difference of 0.3mm.

[0010] Preferably, as an improvement, the socket end has a distance of 3-5mm from the peak of the spigot end.

[0011] The corrugated pipe socket and spigot mold comprises a socket mold segment, a straight pipe mold segment and a spigot mold segment connected in sequence, the inner diameter of the socket mold segment is larger than the inner diameter of the straight pipe mold segment, the inner diameter of the straight pipe mold segment is larger than the inner diameter of the spigot mold segment, and each mold segment is provided with corrugations.

[0012] Preferably, as an improvement, the corrugations are connected with two vacuum slots, wherein the corrugations on the straight pipe mold segment and the spigot mold segment are connected with two vacuum slots.

[0013] The principle and advantages of the present scheme are:

[0014] 1. The risk of damage to the socket and spigot is effectively reduced. In the present scheme, the outer diameter of the socket end is 12-15mm larger than the outer diameter of the straight pipe, i.e. when the corrugated pipe is placed horizontally, the height difference between the socket end and the straight pipe is only 6-7.5mm, so that they are basically in the same straight line, making the storage, transportation, handling process of the socket and straight pipe uniform, greatly reducing the risk of pressurized deformation of the socket end.

[0015] 2. SN4 sealing rings can be used uniformly. Through the improvement of the above-mentioned socket and spigot, DN300 and DN400 series corrugated pipes all use SN4 sealing rings, so that construction personnel will not make mistakes in construction, which will cause damage to the socket and spigot.

[0016] 3. The cost is greatly reduced. The outer diameter of the socket and spigot is reduced, the material cost of ND300 and ND400 pipes is reduced by about 1%, and each corrugated pipe is reduced by about 0.6kg. At the same time, the price of SN4 sealing ring is 41% lower than that of SN8 sealing ring, so the procurement cost of sealing ring for construction party is greatly reduced, which has great market prospect.

[0017] 4、The socket is matched well with the sealing ring. The inner surface of the traditional socket is uneven, which leads to poor contact between the sealing ring and the inner wall of the socket, and there is a risk of water leakage. Moreover, the unevenness is basically 0.8mm, and the sealing ring is rubbed greatly when it is installed, which not only makes the installation difficult, but also easily leads to the damage of the socket. In the scheme, the unevenness of the inner surface of the socket end is 0.3mm-0.4mm, which significantly improves the flatness of the inner surface of the socket, improves the appearance quality of the product, and makes the sealing ring matched well with the inner surface of the socket, and reduces the risk of water leakage. At the same time, by improving the unevenness to 0.3mm-0.4mm, the inner diameter of the socket is directly enlarged by 1mm, so the inner diameter size does not need to be enlarged during the production of the socket to meet the installation requirements. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the bell and spigot socket structure in Example 1.

[0019] Figure 2 It is a partial enlarged view of Figure 1 .

[0020] Figure 3 It is a structure schematic view of Example 2.

[0021] Figure 4 It is a deformation condition of the traditional bell and spigot socket.

[0022] Figure 5 It is a deformation condition of the traditional bell and spigot socket. DETAILED DESCRIPTION

[0023] The following will be further described in detail through specific embodiments:

[0024] The reference signs in the drawings of the specification include: straight pipe 1, socket end 2, spigot end 3, SN4 sealing ring 4, socket die section 5, straight pipe die section 6, spigot die section 7, vacuum joint 8.

[0025] Example 1

[0026] This embodiment is basically as shown in the accompanying Figure 1 , Figure 2As shown: bell and socket structure of corrugated pipe, including the socket end 2 and the socket end 3 connected at both ends of the straight pipe 1, the outer diameter of the socket end 2 is greater than the outer diameter of the straight pipe 1 by 12mm-15mm, less than the range will increase the processing difficulty, at the same time affect the installation of the socket end, if greater than the range will increase the risk of damage to the bell and socket, the preferred embodiment is 12mm. The outer diameter of the socket end 3 is less than the outer diameter of the straight pipe 1 by 9mm-10mm, that is, the peak of the straight pipe 1 is higher than the height t of the peak of the socket end 3, which is between 4.5-5mm, which can effectively constrain the sealing ring, at the same time make the socket end and the socket end have reasonable installation space, more relaxed in the installation process. The concave-convex difference of the inner surface of the socket end 2 is 0.3mm-0.4mm, and the preferred embodiment is 0.3mm. The distance h between the inner wall of the socket end 2 and the socket end 3 is less than the width (radial width) of the SN4 sealing ring 4 by 2mm, and the distance between the adjacent two corrugations of the socket end 3 is less than the thickness (wall thickness) of the SN4 sealing ring 4 by 2mm. In this range, it can ensure the smooth installation of the SN4 sealing ring 4, and ensure the effective sealing of the sealing ring between the socket end and the socket end.

[0027] SN4 in SN4 sealing ring 4 refers to: ring stiffness, the pressure per square meter is greater than or equal to 4KN.

[0028] The structure of ND300 corrugated pipe and ND400 corrugated pipe is specifically illustrated as follows:

[0029] ND300 corrugated pipe, the wall thickness of the corrugated pipe is 1.75mm, the maximum outer diameter of the straight pipe 1 is 337mm, the maximum outer diameter of the socket end 2 is 352mm, the maximum outer diameter of the socket end 3 is 327mm, the inner diameter of the socket end 3 is the same as the inner diameter of the straight pipe 1; the distance between the inner wall of the socket end 2 and the socket end 3 is 21mm, and the distance between the adjacent two corrugations of the socket end 3 is 16.88mm.

[0030] ND400 corrugated pipe, the wall thickness of the corrugated pipe is 2mm, the maximum outer diameter of the straight pipe 1 is 468.2mm, the maximum outer diameter of the socket end 2 is 478.6mm, the maximum outer diameter of the socket end 3 is 458.2mm, the inner diameter of the socket end 3 is the same as the inner diameter of the straight pipe 1; the distance between the inner wall of the socket end 2 and the socket end 3 is 33.5mm, and the distance between the adjacent two corrugations of the socket end 3 is 18.14mm.

[0031] In the prior art, the width of the SN4 and SN8 SN4 sealing rings 4 used by the ND300 corrugated pipe and the width of the SN4 and SN8 SN4 sealing rings 4 used by the ND400 corrugated pipe are as follows.

[0032]

[0033]

[0034] Because the same model of corrugated pipe has two different models of two SN4 sealing rings 4, the construction personnel often mix them up during on-site construction, and the width difference between the two models is 10-14mm, so if the SN4 sealing ring 4 is used incorrectly as SN8, it will cause the damage of the socket.

[0035] Therefore, by implementing the present scheme, the socket of the corrugated pipe is uniformly designed to adapt to the structure of the SN4 sealing ring 4, so that the construction personnel will not use the wrong model during construction, which will cause the socket to be damaged.

[0036] At the same time, in the present scheme, the outer diameter of the socket end 2 is greater than the outer diameter of the straight pipe 1 by 12-15mm, that is, when the corrugated pipe is placed horizontally, the height difference between the socket end 2 and the straight pipe 1 is only 6-7.5mm, so that they are basically in the same straight line, so that the socket and the straight pipe 1 are stored, transported, and unloaded. The stress is uniform, which greatly reduces the risk of pressurized deformation of the socket end 2.

[0037] Embodiment 2

[0038] As shown in Figure 3 The socket of the corrugated pipe, which comprises socket mold segments 5, straight pipe mold segments 6 and socket mold segments 7 connected in sequence, the maximum inner diameter of the socket mold segments 5 is greater than the maximum inner diameter of the straight pipe mold segments 6 by 12-15mm, and the maximum inner diameter of the straight pipe mold segments 6 is greater than the maximum inner diameter of the socket mold segments 7 by 9-10mm, and each mold segment is provided with corrugations. The corrugations are connected to a vacuum gap 8, wherein the corrugations on the straight pipe mold segments 6 and the socket mold segments 7 are connected to two vacuum gaps 8 for connection with a vacuum pump.

[0039] The above is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical scheme of the present application, a number of modifications and improvements can be made, which should be considered as the protection scope of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A bellows socket structure, comprising a bell end and a spigot end connected to both ends of a straight pipe, characterized by: The outer diameter of the bell end is 12mm-15mm larger than the outer diameter of the straight pipe, the inner surface convexity difference of the bell end is 0.3mm-0.4mm, the distance between the inner wall of the bell end and the trough of the socket end is less than the width of the SN4 sealing ring 1mm-3mm, and the distance between two adjacent corrugations of the socket end is less than the thickness of the SN4 sealing ring 1mm-3mm.

2. The bellows socket structure according to claim 1, characterized in that: The outer diameter of the spigot end is 9mm-10mm smaller than the outer diameter of the straight pipe.

3. The bellows socket structure according to claim 2, characterized in that: The outer diameter of the socket end is 12mm larger than the outer diameter of the straight pipe.

4. The bellows socket structure according to claim 3, characterized in that: The inner surface convexity difference of the socket end is 0.3mm.

5. The bellows socket structure according to claim 4, characterized in that: The distance between the inner surface of the socket end and the wave crest of the spigot end is 3-5mm.

6. Bellows socket mold, characterized by: Used for processing the bellows socket structure described in any one of claims 1-5, comprising a socket mold section, a straight pipe mold section and a spigot mold section connected in sequence, the inner diameter of the socket mold section is larger than the inner diameter of the straight pipe mold section, the inner diameter of the straight pipe mold section is larger than the inner diameter of the spigot mold section, and each mold section is provided with corrugations.

7. The bellows socket mold according to claim 6, characterized in that: The corrugations are connected with vacuum gaps, wherein the corrugations on the straight tube mold section and the socket mold section are connected with two vacuum gaps.

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