End structure of stainless steel pipe fitting

Abstract

The utility model belongs to the technical field of stainless steel pipe fittings, in particular to an end structure of a stainless steel pipe fitting, which comprises a pipe fitting made of stainless steel, a port of the pipe fitting is of a flaring structure and is provided with a flaring step, and a support washer is sleeved in a pipe fitting flaring positioned on the outer side of the flaring step. The part, located on the outer side of the supporting gasket, of the pipe fitting retracts inwards in the radial direction of the pipe fitting to form a necking structure or a necking groove, a limiting space for axially limiting the supporting gasket is formed between the necking structure or the necking groove and the flaring step, and the outer wall face of the necking structure or the necking groove is matched with the sealing ring in a sleeved mode. The stainless steel pipe necking device is simple in structure, reasonable in design and low in cost, the supporting gasket is placed in the pipe on the inner side of the necking in advance, the supporting gasket can provide sufficient supporting force for the pipe in the necking process of the pipe, and therefore the problem that the stainless steel pipe sinks during necking is effectively solved.

Description

Technical fields:

[0001] This utility model belongs to the technical field of stainless steel pipe fittings, and specifically refers to an end structure of a stainless steel pipe fitting. Background technology:

[0002] A gas-fired heating and hot water device and its connecting pipe are disclosed in a Chinese utility model patent (authorization announcement number CN208765274U). The gas-fired heating and hot water device includes a main heat exchanger, a connecting pipe, and a first sealing ring. A first annular flange and a second annular flange are spaced apart on the outer wall of the first end of the connecting pipe. Both the first and second annular flanges are circumferentially arranged around the outer wall of the first end of the connecting pipe. The first sealing ring is fitted over the connecting pipe and located between the first and second annular flanges. The first end of the connecting pipe is inserted into the inlet and outlet water terminals. The connecting pipe is made of copper, utilizing the high plasticity of copper to form the first and second annular flanges when the pipe body is narrowed, thereby increasing the support strength of the pipe end, and allowing the first sealing ring to be fitted between the first and second annular flanges.

[0003] However, stainless steel tubes cannot achieve this structure because stainless steel is much harder than copper tubes. Correspondingly, stainless steel is much less malleable than copper tubes. When the end of a stainless steel tube is narrowed, the outer wall surface near the narrowed end is prone to indentation. Summary of the Invention:

[0004] The purpose of this utility model is to provide an end structure for stainless steel pipe fittings, in which a support washer is pre-placed inside the pipe fitting on the inner side of the constriction to provide sufficient support force, thereby effectively solving the problem of dents occurring when stainless steel pipe fittings are constricted.

[0005] This utility model is implemented as follows:

[0006] An end structure of a stainless steel pipe fitting includes a pipe fitting made of stainless steel, the end of which is a flared structure with a flared step, a support washer is fitted inside the flared end of the pipe fitting located outside the flared step, and the pipe fitting located outside the support washer is radially recessed inward to form a constricted structure or constricted groove, a limiting space for axially limiting the support washer is formed between the constricted structure or constricted groove and the flared step, and the outer wall surface of the constricted structure or constricted groove is fitted with a sealing ring.

[0007] In the above-mentioned end structure of a stainless steel pipe fitting, the inner diameter of the supporting washer is greater than or equal to the inner diameter of the flared step and the inner diameter of the inner wall of the pipe fitting corresponding to the constriction structure or constriction groove.

[0008] In the end structure of the stainless steel pipe fitting described above, one or more support washers are stacked along the axial direction of the pipe fitting.

[0009] In the end structure of the stainless steel pipe fitting described above, the limiting space and the supporting washer are in an overtight fit.

[0010] In the end structure of the stainless steel pipe fitting described above, the pipe fitting port located outside the constriction groove is folded inward along its radial direction to form a folded port portion.

[0011] The outstanding advantages of this utility model compared to the prior art are:

[0012] This utility model has a simple structure, reasonable design and low cost. By pre-placing a support washer inside the pipe fitting on the inner side of the constriction, the support washer can provide sufficient support for the pipe fitting during the constriction process, thereby effectively solving the problem of dents occurring when stainless steel pipe fittings are constricted. Attached image description:

[0013] Figure 1 This is a cross-sectional view of the end of the stainless steel pipe fitting of this utility model;

[0014] Figure 2 This is a cross-sectional view of the stainless steel pipe fitting of this utility model without a support washer at the end.

[0015] In the diagram: 1. Pipe fitting; 2. Flared step; 3. Support washer; 4. Narrow groove; 5. Folded end. Detailed implementation method:

[0016] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —2:

[0017] An end structure of a stainless steel pipe fitting includes a pipe fitting 1 made of stainless steel. The port of the pipe fitting 1 is a flared structure with a flared step 2. A support washer 3 is fitted inside the flared end of the pipe fitting 1 located outside the flared step 2. The pipe fitting 1 located outside the support washer 3 is radially recessed to form a constricted structure or constricted groove 4. A limiting space is formed between the constricted structure or constricted groove 4 and the flared step 2 to axially limit the support washer 3. The outer wall surface of the constricted structure or constricted groove 4 is fitted with a sealing ring.

[0018] This utility model has a simple structure, reasonable design and low cost. By pre-placing a support washer 3 inside the pipe fitting 1 on the inner side of the constriction, the support washer 3 can provide sufficient support for the pipe fitting 1 during the constriction process, thereby effectively solving the problem of dents occurring when the stainless steel pipe fitting 1 is constricted.

[0019] Meanwhile, in order to avoid the setting of the support washer 3 from affecting the normal operation of the fitting 1 after it is fitted with the external pipeline, the inner diameter of the support washer 3 is greater than or equal to the inner diameter of the flared step 2 and the inner diameter of the inner wall of the fitting 1 corresponding to the constriction structure or constriction groove 4.

[0020] The number of support washers 3 is designed according to the specific dimensions of the stainless steel pipe fitting 1, so one or more support washers are stacked along the axial direction of the pipe fitting 1. In this embodiment, the number of support washers 3 is two.

[0021] Furthermore, in order to prevent the support washer 3 from axially displacing within the pipe fitting 1, thereby generating noise and damaging the pipe body, the limiting space and the support washer 3 are fitted together with an overtight fit.

[0022] In addition, in order to improve the support strength at the pipe end, the pipe end 1 located outside the constriction groove 4 is folded inward along its radial direction to form a folded port portion 5.

[0023] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. An end structure for a stainless steel pipe fitting, comprising a pipe fitting (1) made of stainless steel, characterized in that: The port of the pipe fitting (1) is a flared structure with a flared step (2). The pipe fitting (1) located outside the flared step (2) has a support washer (3) installed inside the flared end. The pipe fitting (1) located outside the support washer (3) is radially recessed to form a constricted structure or constricted groove (4). The constricted structure or constricted groove (4) and the flared step (2) form a limiting space for axially limiting the support washer (3). The outer wall surface of the constricted structure or constricted groove (4) is provided for the sealing ring to fit.

2. The end structure of a stainless steel pipe fitting according to claim 1, characterized in that: The inner diameter of the support washer (3) is greater than or equal to the inner diameter of the flared step (2) and the inner diameter of the inner wall of the fitting (1) corresponding to the constriction structure or constriction groove (4).

3. The end structure of a stainless steel pipe fitting according to claim 1, characterized in that: One or more support washers are stacked along the axial direction of the pipe fitting (1).

4. The end structure of a stainless steel pipe fitting according to claim 1, characterized in that: The limiting space and the support washer (3) are fitted together with an overtight fit.

5. The end structure of a stainless steel pipe fitting according to claim 1, characterized in that: The pipe fitting (1) located outside the constriction groove (4) is folded inward along its radial direction to form a folded port portion (5).

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