Special sleeve for buckling connection of low-pressure pipe

Abstract

The utility model discloses a special sleeve for buckling connection of a low-pressure pipe, which comprises a vertically through cylindrical barrel, a positioning ring and a limiting ring positioned below the positioning ring are integrally arranged at the upper end of the barrel, the inner diameters of the positioning ring and the limiting ring are both smaller than the inner diameter of the barrel, and the upper end face of the positioning ring is flush with the upper end face of the barrel. An annular positioning groove is formed between the positioning ring and the limiting ring, a plurality of sealing pressing rings are arranged on the inner circle of the barrel body and located below the limiting ring in the axis direction, an annular groove is formed between any two adjacent sealing pressing rings, the outer contour of the cross section of each sealing pressing ring is a first arc section, and the outer contour of the cross section of each annular groove is a second arc section. According to the utility model, the sealing convex ring with the sharp edge, of which the cross section of the inner circle of the sleeve is in the shape of a triangle or an isosceles trapezoid, is improved into the first arc line section with the central angle of 180 degrees, and due to the absence of the sharp edge, the problems of connection and matching and the phenomenon that the low-pressure pipe is easy to buckle and break are solved, and meanwhile, the sealing and pressure-bearing effects are enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of safe connection of hydraulic pipelines, and particularly relates to a special sleeve for crimping and connecting low-pressure pipes. Background Art

[0002] For low-pressure pipes such as transparent liquid level pipes and air pipes, the conventional connection method is to use flare fittings and hose clamps. The connection forms of the fittings are few, and the number of required ones is small. There are few that can be matched with reducing fittings or components, and they are not easy to purchase. Moreover, after fastening with hose clamps, loosening, liquid leakage and other situations will occur as the service time increases.

[0003] In order to facilitate connection, currently, the form of engineering high-pressure hose crimping fittings is adopted for crimping low-pressure pipes before use. However, at present, the cross-section of the sealing convex ring on the inner circle of the sleeve in the industry is triangular or isosceles trapezoidal, and the edges and corners are generally relatively sharp. Due to poor control of the crimping amount and differences in the structure and quality of low-pressure pipes, it is easy to cause the low-pressure pipes to be crimped and broken, resulting in more liquid leakage and scrapping situations. Content of the Utility Model

[0004] In order to solve the above technical problems existing in the prior art, the utility model provides a special sleeve for crimping and connecting low-pressure pipes with good crimping quality, not easy to damage low-pressure pipes, and good sealing effect.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme: a special sleeve for crimping and connecting low-pressure pipes, including a cylinder body that is vertically transparent and cylindrical. The upper end of the cylinder body is integrally provided with a positioning ring and a limiting ring located below the positioning ring. The inner diameters of the positioning ring and the limiting ring are both smaller than the inner diameter of the cylinder body. The upper end face of the positioning ring is flush with the upper end face of the cylinder body. An annular positioning groove is formed between the positioning ring and the limiting ring. Along the axial direction below the limiting ring on the inner circle of the cylinder body, there are several sealing pressure rings. An annular groove is formed between any two adjacent sealing pressure rings. The outer contour of the cross-section of each sealing pressure ring is a first arc segment, and the outer contour of the cross-section of each annular groove is a second arc segment.

[0006] The first arc segment protrudes towards the center line of the cylinder body, the second arc segment depresses towards the inner wall of the cylinder body. The central angles of both the first arc segment and the second arc segment are 180°. The two ends of the upper end of the second arc segment are respectively tangent to the lower end of the upper first arc segment and the upper end of the lower first arc segment.

[0007] The radius of the first arc segment is 1.5 mm, and the radius of the second arc segment is 0.25 mm.

[0008] Between the upper part of the uppermost first arc segment and the inner wall of the cylinder body and between the lower part of the lowermost first arc segment and the inner wall of the cylinder body, they are both transitioned through arc segments. The central angle of the arc segment is 90°, and the radius of the arc segment is 0.25 mm.

[0009] The outer circumference of the cylinder body is provided with an annular positioning step on the outside of the limiting ring. The diameter of the outer circumference of the cylinder body above the annular positioning step is smaller than that below the annular positioning step. The radii of the outer circumference and the inner circumference of the cylinder body below the annular positioning step are 14 mm and 12.5 mm respectively, and the radius of the outer circumference of the cylinder body above the annular positioning step is 13.5 mm.

[0010] Adopting the above technical solution, compared with the prior art, the utility model has the following beneficial effects:

[0011] (1) The outer contour of the cross-section of the sealing press ring is a first arc segment, without sharp edges (corners), and no sharp stress will be generated during the swaging. Therefore, the sealing press ring will not cut the local part of the low-pressure pipe during the swaging, ensuring the integrity of the low-pressure pipe.

[0012] (2) The cross-section of the bottom of the annular groove is a second arc segment, which is tangent to the first arc segments on the upper and lower sides. And there are arc segments for transition between the upper part of the first arc segment at the uppermost end and the inner wall of the cylinder body, and between the lower part of the first arc segment at the lowermost end and the inner wall of the cylinder body. In this way, there are no edges (corners) in the entire range of the inner circumference of the cylinder body under the action of the swaging pressure, thus ensuring that the low-pressure pipe inside the cylinder body will not be damaged at all, and avoiding potential safety hazards of liquid leakage and air leakage during operation.

[0013] (3) When the core, the sleeve and the low-pressure pipe are assembled in place and then placed on the swaging machine, the annular positioning step plays a positioning role, ensuring that the sleeve below the annular positioning step is within the swaging stress range. This facilitates the operation of the worker, with accurate positioning, avoiding the situation of too small or too large swaging area, and keeping the swaging quality of the whole batch of products consistent.

[0014] (4) The radius of the first arc segment is 1.5 mm, the radius of the second arc segment is 0.25 mm, and the radius of the arc segment is 0.25 mm. These dimensional parameters are the optimal choices for the radii of the outer circumference and the inner circumference of the cylinder body below the annular positioning step being 14 mm and 12.5 mm respectively. If the outer diameter and inner diameter dimensions of the cylinder body change, the radii of the first arc segment, the second arc segment and the arc segment can be changed accordingly, but only need to ensure that the radius of the first arc segment is about 6 times the radius of the second arc segment, and the second arc segment is equal to the radius of the arc segment.

[0015] To sum up, the utility model mainly improves the sealing convex ring with a triangular or isosceles trapezoidal cross-section of the inner circumference of the sleeve, etc., which has sharp edges, into a semi-circular structure (a first arc segment with a central angle of 180°). Since the semi-circular structure has no sharp edges, it solves the problems of connection and matching and the phenomenon that the low-pressure pipe is easily broken during swaging, and at the same time enhances the sealing and pressure-bearing effect. Description of the Drawings

[0016] Figure 1 is the overall structural schematic diagram of the present utility model;

[0017] Figure 2 is the assembly structural schematic diagram of the present utility model after being clamped with the core and the low-pressure pipe. Specific embodiments

[0018] The following further describes in detail the embodiments of the present utility model with reference to the accompanying drawings and embodiments.

[0019] Figure 1 and Figure 2 As shown in

[0020] and

[0021] , a special sleeve for clamping and connecting a low-pressure pipe of the present utility model includes a cylindrical body 1 that is vertically transparent and cylindrical. A positioning ring 2 and a limiting ring 3 located below the positioning ring 2 are integrally provided at the upper end of the body 1. The inner diameters of the positioning ring 2 and the limiting ring 3 are both smaller than the inner diameter of the body 1. The upper end surface of the positioning ring 2 is flush with the upper end surface of the body 1. An annular positioning groove 4 is formed between the positioning ring 2 and the limiting ring 3. A plurality of sealing pressing rings 5 are provided on the inner circle of the body 1 along the axial direction below the limiting ring 3. An annular groove 6 is formed between any two adjacent sealing pressing rings 5. The outer contour of the cross-section of each sealing pressing ring 5 is a first arc segment 7, and the outer contour of the cross-section of each annular groove 6 is a second arc segment 8.

[0022] The first arc segment 7 protrudes towards the center line of the body 1, and the second arc segment 8 depresses towards the inner wall of the body 1. The central angles of both the first arc segment 7 and the second arc segment 8 are 180°. The two ends of the upper end of the second arc segment 8 are respectively tangent to the lower end of the upper first arc segment 7 and the upper end of the lower first arc segment 7.

[0023] The radius of the first arc segment 7 is 1.5 mm, and the radius of the second arc segment 8 is 0.25 mm.

[0024] Between the upper part of the uppermost first arc segment 7 and the inner wall of the body 1 and between the lower part of the lowermost first arc segment 7 and the inner wall of the body 1, they are both transitioned through an arc segment 9. The central angle of the arc segment 9 is 90°, and the radius of the arc segment 9 is 0.25 mm.

[0025] Compared with the prior art, the present utility model has the following beneficial effects:(1)The outer contour of the cross-section of the sealing press ring 5 is the first arc segment 7, without sharp edges (corners), and no sharp stress will be generated during crimping. Therefore, the sealing press ring 5 will not cut the local part of the low-pressure pipe during crimping, ensuring the integrity of the low-pressure pipe.

[0026] (2)The bottom cross-section of the annular groove 6 is the second arc segment 8. The second arc segment 8 is tangent to the first arc segments 7 on the upper and lower sides, and the upper part of the first arc segment 7 at the uppermost end and the lower part of the first arc segment 7 at the lowermost end are both transitioned by the arc segments 9 with the inner wall of the cylinder 1. In this way, there are no edges (corners) in the entire range of the inner circle of the cylinder 1 under the action of the crimping pressure, so as to ensure that the low-pressure pipe inside the cylinder 1 will not be damaged at all, thus avoiding potential safety hazards of liquid leakage and air leakage during operation.

[0027] (3)When the core 11, the sleeve 12 and the low-pressure pipe 13 are assembled in place and then placed on the crimping machine, the annular positioning step 10 plays a positioning role to ensure that the sleeve 12 below the annular positioning step 10 is within the crimping stress range. This facilitates the operation of the worker, with accurate positioning, avoiding the occurrence of small or large crimping areas, and keeping the crimping quality of the whole batch of products consistent.

[0028] (4)The radius of the first arc segment 7 is 1.5 mm, the radius of the second arc segment 8 is 0.25 mm, and the radius of the arc segment 9 is 0.25 mm. These dimensional parameters are the optimal choices for the outer and inner radii of the cylinder 1 below the annular positioning step 10, which are 14 mm and 12.5 mm respectively. If the outer and inner diameters of the cylinder 1 change, the radii of the first arc segment 7, the second arc segment 8 and the arc segment 9 can be changed accordingly, but only need to ensure that the radius of the first arc segment 7 is about 6 times the radius of the second arc segment 8, and the second arc segment 8 is equal to the radius of the arc segment 9.

[0029] The above embodiments illustrate the basic principles and features of the present invention. However, the above only illustrates the preferred embodiments of the present invention and is not limited by the described embodiments. Under the inspiration of this patent, those of ordinary skill in the art can also make many forms of deformation and improvement without departing from the purpose of the present invention and the scope protected by the claims. These all belong to the protection scope of the present invention. Therefore, the patent and protection scope of the present invention shall be subject to the appended claims.

Claims

1. A special sleeve for low-pressure pipe clamping connection, comprising a cylindrical body that is vertically transparent and cylindrical. An upper positioning ring and a limiting ring located below the positioning ring are integrally provided at the upper end of the body. The inner diameters of both the positioning ring and the limiting ring are smaller than the inner diameter of the body. The upper end face of the positioning ring is flush with the upper end face of the body, and an annular positioning groove is formed between the positioning ring and the limiting ring. It is characterized in that: Several sealing pressure rings are provided on the inner circle of the cylinder below the limit ring along the axial direction. An annular groove is formed between any two adjacent sealing pressure rings. The outer contour of the cross section of each sealing pressure ring is a first arc segment, and the outer contour of the cross section of each annular groove is a second arc segment.

2. The special sleeve for low-pressure pipe clamping connection according to claim 1, characterized in that: The first arc segment protrudes toward the center line of the cylinder, and the second arc segment is recessed toward the inner wall of the cylinder. The central angles of the first arc segment and the second arc segment are both 180°, and the two ends of the upper end of the second arc segment are tangent to the lower end of the first arc segment on the upper side and the upper end of the first arc segment on the lower side, respectively.

3. The special sleeve for low-pressure pipe clamping connection according to claim 2, characterized in that: The radius of the first arc segment is 1.5 mm, and the radius of the second arc segment is 0.25 mm.

4. A special sleeve for low-pressure pipe crimping connection according to claim 1 or 2 or 3, characterized in that: The upper part of the first arc segment at the top and the inner wall of the cylinder and the lower part of the first arc segment at the bottom and the inner wall of the cylinder are both transitioned by arc segments, the central angle of the arc segment is 90°, and the radius of the arc segment is 0.25mm.

5. A special sleeve for low-pressure pipe clamping connection according to claim 1 or 2 or 3, characterized in that: An annular positioning step is provided on the outer side of the limit ring on the outer circle of the cylinder. The diameter of the outer circle of the cylinder on the upper side of the annular positioning step is smaller than the diameter of the lower side of the annular positioning step. The radii of the outer circle and inner circle of the cylinder on the lower side of the annular positioning step are 14mm and 12.5mm respectively, and the radius of the outer circle of the cylinder on the upper side of the annular positioning step is 13.5mm.

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