Loose joint pipe fitting

Abstract

A loose joint pipe fitting comprises a body, a loose joint nut, a check ring and a pipe sleeve. A first inner protruding ring is arranged on one end face of the loose joint nut, and a sealing flange which can penetrate through the first inner protruding ring and can be attached to the inner end face of the first inner protruding ring is arranged at one end of the body. The other end of the body is provided with a core body, the core body is sleeved with a pipe sleeve and a check ring, the check ring is located on the side, close to the loose joint nut, of the pipe sleeve, and an insertion cavity used for insertion of an insertion pipe is defined by the core body, the check ring and the pipe sleeve. The loose joint pipe fitting can be applied to pipeline systems for water supply and drainage, heating and the like for connection and overhaul, the loose joint nut does not need to be pressed, accessories such as the nut and a sealing gasket can be assembled or replaced on site, use is flexible, overhaul and maintenance are convenient, potential safety hazards are eradicated, the overhaul efficiency of an installation hydraulic project is greatly improved, and the maintenance cost is reduced; and the structure is simple and compact, the cost is low, the environment is protected, and the product is competitive.

Description

Technical Field

[0001] The utility model relates to the field of pipe fittings connection, and particularly to a union pipe fitting. Background Technique

[0002] Union pipe fittings can be applied to pipeline systems such as water supply and drainage, heating, etc. for connection and maintenance. In the pipeline industry, crimp-type union pipe fittings are more commonly used. One end of the pipe fitting is a crimp-type structure, and special crimping tools such as TH-type and U-type installation tools are required for crimping during assembly. The other end is a union structure, and the sealing gasket is compressed by twisting the union nut to achieve sealing. Usually, such pipe fittings are used at pipeline connection points that need to be frequently installed, disassembled, or replaced. After the traditional crimp-type union pipe fitting is installed, the union nut cannot be replaced. If the union nut cracks due to stress or the thread wears and slips due to frequent installation and disassembly during use, or the nut is damaged due to excessive hydraulic torque, the pipe needs to be cut and the entire union pipe fitting needs to be replaced, which is time-consuming and laborious. If it is used in a wall-embedded pipeline, the maintenance cost is very high. In addition, due to considering the replacement of the sealing gasket in the future, the traditional crimp-type union pipe fitting must reserve at least one nut-width of movable space in the matching section of the body and the nut. When replacing the sealing gasket, the nut needs to be axially moved backward until the sealing gasket is exposed for operation, thereby increasing the material cost of the body.

[0003] In view of this, it is particularly necessary to provide a union pipe fitting that facilitates the disassembly and assembly of the union nut. Content of the Utility Model

[0004] The purpose of the utility model is to provide a union pipe fitting that facilitates the disassembly, assembly, and maintenance of the union nut.

[0005] The embodiment of the utility model is implemented as follows:

[0006] In a first aspect, the utility model provides a union pipe fitting, including a body, a union nut, a retaining ring, and a pipe sleeve;

[0007] A first inner convex ring is arranged on one end face of the union nut, and a sealing flange is arranged at one end of the body, which can pass through the first inner convex ring and can be attached to the inner end face of the first inner convex ring;

[0008] A core body is arranged at the other end of the body, a pipe sleeve and a retaining ring are sleeved on the core body, the retaining ring is located on the side of the pipe sleeve close to the union nut, and an insertion cavity for inserting an insertion pipe is formed among the core body, the retaining ring, and the pipe sleeve.

[0009] In an alternative embodiment, the sealing flange includes an annular side surface, which includes an arc-shaped surface portion and two arcuate surface portions. The two arcuate surface portions are respectively disposed on both sides of the axis of the sealing flange. The outer diameter H at the maximum outer diameter of the sealing flange is greater than the inner diameter of the first inner convex ring. The maximum width B of the sealing flange in the direction perpendicular to the direction where the maximum outer diameter is located is less than or equal to the inner diameter of the first inner convex ring, and the minimum width C of the sealing flange in the direction perpendicular to the direction where the maximum outer diameter is located is 2 / 5 - 3 / 5 times of B.

[0010] And / or, a reduced-diameter portion is provided between the core body and the sealing flange.

[0011] In an alternative embodiment, a third convex ring is provided on the side of the sealing flange close to the core body, and the orthographic projection of the third convex ring on the end surface of the sealing flange is within the contour of the end surface of the sealing flange.

[0012] And / or, an outer ring is provided on the side of the sealing flange away from the core body, and an accommodation ring for accommodating a seal is formed between the outer ring and the union nut.

[0013] In an alternative embodiment, a second inner convex ring is provided on the retaining ring, and a first outer card slot for accommodating the second inner convex ring is provided on the outer surface of the core body.

[0014] In an alternative embodiment, a second inner card slot is provided on the retaining ring. One end of the sleeve extends into the retaining ring, and an annular protrusion capable of extending into the second inner card slot is provided at the end of the sleeve extending into the retaining ring.

[0015] In an alternative embodiment, an observation hole is provided at a position of the sleeve close to the retaining ring.

[0016] In an alternative embodiment, a sealing groove for accommodating a sealing ring is provided on the core body.

[0017] In an alternative embodiment, an inverted tooth ring is provided on the core body, and there are more than two inverted tooth rings, and the more than two inverted tooth rings are arranged in sequence along the axis direction of the core body.

[0018] In an alternative embodiment, a flared mouth is provided at one end of the sleeve away from the retaining ring.

[0019] The beneficial effects of the embodiments of the present utility model are:

[0020] The quick coupling fitting in this application can be applied to pipeline systems such as water supply and drainage, heating, etc. for connection and maintenance. Among them, the quick coupling nut does not need to be crimped, and accessories such as nuts and gaskets can be assembled or replaced on-site. It is flexible to use, convenient for maintenance, eliminates potential safety hazards, greatly improves the maintenance efficiency of installation plumbers and reduces maintenance costs. Its structure is simple and compact, the cost is low, it is green and environmentally friendly, and the product has competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the quick coupling fitting of the present utility model;

[0023] Figure 2 It is a schematic structural diagram of the main body of the present utility model;

[0024] Figure 3 It is a schematic structural diagram of the sealing flange of the present utility model;

[0025] Figure 4 It is a cross-sectional view of the main body of the present utility model;

[0026] Figure 5 It is a cross-sectional schematic diagram of the quick coupling nut of the present utility model;

[0027] Figure 6 It is a cross-sectional schematic diagram of the retaining ring of the present utility model;

[0028] Figure 7 It is a cross-sectional schematic diagram of the pipe sleeve of the present utility model.

[0029] Reference numerals: 100 - main body; 110 - sealing flange; 111 - arc surface part; 112 - arc-shaped surface part; 120 - third convex ring; 130 - outer ring; 140 - reduced diameter part; 150 - core body; 151 - first outer card slot; 152 - sealing groove; 153 - reverse tooth ring; 200 - quick coupling nut; 210 - first inner convex ring; 300 - retaining ring; 310 - second inner convex ring; 320 - second inner card slot; 400 - pipe sleeve; 410 - annular protrusion; 420 - observation hole; 430 - flared mouth; 500 - sealing gasket; 600 - sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0032] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0034] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0035] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] Please refer toFigure 1 , this embodiment provides a union fitting, including a body 100, a union nut 200, a retaining ring 300, and a ferrule 400;

[0037] A first inner convex ring 210 is provided on one end face of the union nut 200, and a sealing flange 110 capable of passing through the first inner convex ring 210 and fitting with the inner end face of the first inner convex ring 210 is provided at one end of the body 100;

[0038] A core body 150 is provided at the other end of the body 100. A ferrule 400 and a retaining ring 300 are sleeved on the core body 150. The retaining ring 300 is located on the side of the ferrule 400 close to the union nut 200. An insertion cavity for inserting an insertion pipe is formed among the core body 150, the retaining ring 300, and the ferrule 400.

[0039] The union nut 200 of the union fitting in this embodiment includes a first inner convex ring 210, and the sealing flange 110 can directly pass through the inner convex ring and extend into the inner convex ring. In this way, during use, when the union nut 200 slips due to stress cracking, frequent installation and disassembly resulting in thread wear, or damage to the nut due to excessive hydraulic torque, it only needs to remove the union nut 200 and then replace it with a new one, without the need to cut the pipe and replace the entire union fitting, which is convenient for the disassembly, installation, and maintenance of the union nut 200.

[0040] The body 100 in this embodiment can be injection molded with engineering plastics such as PPSU or made by metal processing.

[0041] The union fitting in this embodiment can be applied to pipeline systems such as water supply and drainage, heating, etc. for connection and maintenance. The union nut 200 does not need to be crimped, and accessories such as nuts and gaskets can be assembled or replaced on site. It is flexible in use, convenient for maintenance, eliminates potential safety hazards, greatly improves the maintenance efficiency of installation plumbers and reduces the maintenance cost. Its structure is simple and compact, the cost is low, it is green and environmentally friendly, and the product has competitiveness.

[0042] In an alternative embodiment, as Figures 2 - 5 shown, the sealing flange 110 includes an annular side surface. The annular side surface includes an arc surface portion 111 and two arc surface portions 112. The two arc surface portions 112 are respectively arranged on both sides of the axis of the sealing flange 110. The outer diameter H at the maximum outer diameter of the sealing flange is greater than the inner diameter of the first inner convex ring 210. The maximum width B of the sealing flange in the direction perpendicular to the maximum outer diameter is less than or equal to the inner diameter of the first inner convex ring 210, and the minimum width C of the sealing flange in the direction perpendicular to the maximum outer diameter is 2 / 5 - 3 / 5 times of B.

[0043] In this embodiment, the width B and the width C are smaller than the inner diameter of the first inner convex ring 210. When assembling the union nut 200, it is only necessary to tilt the union nut 200 by about 45 degrees so that the first inner convex ring 210 first enters from the end with dimension B of the sealing flange 110, and then move it towards the installation groove of the main body 100 while straightening the tilt angle of the union nut 200, then the union nut 200 can be completely inserted. Since the width B of the sealing flange 110 is smaller than the inner diameter of the first inner convex ring 210, and the width C is smaller than the width B, and in combination with the arc-shaped surfaces 112 on both sides of the sealing flange 110, there will be no interference when assembling the union nut 200.

[0044] It should be noted that in this embodiment, the outer diameter H at the maximum outer diameter of the sealing flange is larger than the inner diameter of the first inner convex ring 210, which can prevent the sealing flange from coming out of the union nut 200 during normal operation; the width B and the width C can be as large as possible on the premise of not affecting the disassembly and assembly of the union nut 200 to cover the inner diameter of the first inner convex ring 210. Usually, the width B is slightly smaller than the first inner convex ring 210. The width of the sealing flange 110 gradually decreases from the width B to the width C. In some embodiments, the arc-shaped surface 112 can be symmetrically arranged with respect to a plane passing through the axis and a diameter.

[0045] In an alternative embodiment, as Figure 4 shown, a reduced-diameter portion 140 is provided between the core body 150 and the sealing flange 110.

[0046] The existence of the reduced-diameter portion 140 facilitates the inclined sleeving of the union nut 200 on the sealing flange 110.

[0047] In an alternative embodiment, a third convex ring 120 is provided on the side of the sealing flange 110 close to the core body 150, and the orthographic projection of the third convex ring 120 on the end face of the sealing flange 110 is within the contour of the end face of the sealing flange 110.

[0048] The third convex ring 120 can increase the strength of the sealing flange 110 and prevent the flange from deforming when tightening the nut.

[0049] In an alternative embodiment, an outer ring 130 is provided on the side of the sealing flange 110 away from the core body 150, and an accommodation ring for accommodating a seal is formed between the outer ring 130 and the union nut 200.

[0050] The presence of the sealing ring 600 can improve the sealing performance between the sealing flange 110 and the union nut 200. Usually, the thickness of the sealing ring 600 is greater than the depth of the accommodation ring. The outer diameter of the sealing ring 600 is adapted to the inner diameter of the union nut 200, and the inner diameter of the sealing ring 600 is adapted to the outer diameter of the outer ring 130.

[0051] In an alternative embodiment, as Figure 4 and Figure 6 shown, a second inner convex ring 310 is provided on the retaining ring 300, and a first outer card slot 151 for accommodating the second inner convex ring 310 is provided on the outer surface of the core body 150.

[0052] The cooperation between the second inner convex ring 310 and the first outer card slot 151 can fix the retaining ring 300 and prevent it from detaching. It should be noted that in some embodiments, in order to facilitate the installation of the retaining ring 300, an outer convex ring is provided on the side of the first outer card slot 151 away from the sealing flange 110, and an inclined surface is provided on the side of the outer convex ring away from the sealing flange 110. The retaining ring 300 can be injection-molded with an engineering plastic such as PE.

[0053] It should be noted that an outer convex ring can also be provided on the retaining ring 300 to position the crimping pliers installation tool during installation, making the indentation position more accurate and the sealing more reliable.

[0054] In an alternative embodiment, as Figure 6 and Figure 7 shown, a second inner card slot 320 is provided on the retaining ring 300, one end of the sleeve 400 extends into the retaining ring 300, and an annular protrusion 410 capable of extending into the second inner card slot 320 is provided at the end of the sleeve 400 extending into the retaining ring 300.

[0055] The cooperation between the second inner card slot 320 and the annular protrusion 410 can position the sleeve 400 and prevent the sleeve 400 from coming out. In addition, in order to facilitate the insertion of the sleeve 400 into the retaining ring 300, a chamfer can be provided on the inner surface edge of the retaining ring 300 away from the union nut 200.

[0056] In an alternative embodiment, an observation hole 420 is provided at a position where the sleeve 400 is close to the retaining ring 300.

[0057] The observation hole 420 can observe whether the insertion tube is inserted in place. Among them, the specific position of the observation hole 420 can be as close to and even in contact with the retaining ring 300 as possible without being covered by the retaining ring 300.

[0058] In an alternative embodiment, a sealing groove 152 for accommodating the sealing ring 600 is provided on the core body 150 to improve the sealing effect between the core body 150 and the inserted insertion tube.

[0059] The number of the sealing grooves 152 can be one, or more than two. More than two of the sealing grooves 152 are arranged in sequence along the axis direction of the core body 150.

[0060] The axial position of the sealing groove 152 is preferably set below the crimping teeth of the crimping clamp head during installation and crimping. After installation and crimping, the sealing ring 600 can be tightly attached to the inner wall of the pipeline and the surface of the sealing groove 152 to prevent leakage.

[0061] In an optional embodiment, an inverted gear ring 153 is provided on the core body 150 , and there are more than two inverted gear rings 153 , which are sequentially arranged along the axial direction of the core body 150 .

[0062] The presence of the inverted teeth can serve as a guide when installing the cannula. After the cannula is installed, the inverted teeth can increase the friction between the core body 150 and the inserted cannula, which is beneficial to improving the stability of the connection.

[0063] In an optional embodiment, a bell mouth 430 is provided at one end of the sleeve away from the retaining ring 300 to facilitate insertion of the cannula.

[0064] The assembly process of the flexible pipe assembly in this embodiment includes the following steps:

[0065] 1. Place the sealing ring 600 on the sealing groove 152 of the core 150;

[0066] 2. Place the retaining ring 300 in the first outer groove 151 of the core 150 to prevent the retaining ring 300 from falling out;

[0067] 3. Install the sleeve 400 onto the retaining ring 300 so that the annular protrusion 410 of the sleeve 400 engages with the second inner groove 320 of the retaining ring 300;

[0068] 4. Tilt the union nut 200 by about 45 degrees so that the first inner protrusion 210 of the union nut 200 is first inserted from the dimension B end of the sealing flange 110, and then moved toward the reduced diameter portion 140 of the body 100 while adjusting the tilt angle of the union nut 200 until it is completely inserted into the reduced diameter portion 140.

[0069] 5. Put the sealing gasket 500 onto the outer ring 130 and make it fit tightly against the end face of the sealing flange 110.

[0070] The installation process includes the following steps:

[0071] 1. After cutting the pipe, chamfer the pipe end;

[0072] 2. Insert the chamfered pipe end into the core 150 of the pipe fitting and insert it to the bottom of the retaining ring 300. The pipe end can be observed through the through hole of the retaining ring 300, indicating that it has been inserted to the bottom.

[0073] 3. Use a special crimping tool to crimp the pipe sleeve 400. During crimping, the inner groove of the crimping pliers head can be clamped into the outer convex ring of the retaining ring 300 to complete the clamping and installation. After crimping, the inner wall of the pipe and the sealing groove 152 of the body 100 are closely attached to the surface of the sealing ring 600 to form a sealing band to prevent water leakage.

[0074] 4. Screw the external thread interface of the pipeline with the union nut 200 and tighten the union nut 200. The end face of the external thread interface of the pipeline presses the sealing gasket 500 to prevent water leakage.

[0075] The process of replacing the nut and gasket includes the following steps:

[0076] 1. Reverse-rotate and loosen the union nut 200, and take out the sealing gasket 500 (if there is no need to replace the union nut 200, directly replace it with a new sealing gasket 500).

[0077] 2. Move the union nut 200 backward and tilt it at a certain angle so that the first inner convex ring 210 first passes through one end of the width C of the sealing flange 110. Continue to move the union nut 200 and adjust the tilt angle until the union nut 200 is completely removed.

[0078] 3. Replace the new nut and sealing gasket 500 according to the above installation process.

[0079] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A live connection fitting, characterized in that, It includes a body, a union nut, a retaining ring and a sleeve; A first inner convex ring is provided on one end face of the union nut, and a sealing flange capable of passing through the first inner convex ring and fitting with the inner end face of the first inner convex ring is provided at one end of the body; A core body is provided at the other end of the body, a sleeve and a retaining ring are sleeved on the core body, the retaining ring is located on the side of the sleeve close to the union nut, and an insertion cavity for inserting an insertion tube is formed among the core body, the retaining ring and the sleeve.

2. The live connection fitting according to claim 1, characterized in that, The sealing flange includes an annular side face, the annular side face includes an arc face part and two arc face parts, the two arc face parts are respectively arranged on both sides of the axis of the sealing flange, the outer diameter H at the maximum outer diameter of the sealing flange is greater than the inner diameter of the first inner convex ring, the maximum width B of the sealing flange in the direction perpendicular to the direction where the maximum outer diameter is located is less than or equal to the inner diameter of the first inner convex ring, and the minimum width C of the sealing flange in the direction perpendicular to the direction where the maximum outer diameter is located is 2 / 5 - 3 / 5 times of B; And / or, a reduced diameter part is provided between the core body and the sealing flange.

3. The live connection fitting according to claim 1, characterized in that, A third convex ring is provided on the side of the sealing flange close to the core body, and the orthographic projection of the third convex ring on the end face of the sealing flange is within the contour of the end face of the sealing flange.

4. The live connection fitting according to claim 1, characterized in that, An outer ring is provided on the side of the sealing flange away from the core body, and an accommodation ring for accommodating a sealing member is formed between the outer ring and the union nut.

5. The live connection fitting according to claim 1, characterized in that, A second inner convex ring is provided on the retaining ring, and a first outer card slot for accommodating the second inner convex ring is provided on the outer surface of the core body.

6. The live connection fitting according to claim 1, characterized in that, A second inner card slot is provided on the retaining ring, one end of the sleeve extends into the retaining ring, and an annular protrusion capable of extending into the second inner card slot is provided at the end of the sleeve extending into the retaining ring.

7. The live connection fitting according to claim 1, characterized in that, An observation hole is provided at the position of the sleeve close to the retaining ring.

8. The live connection fitting according to claim 1, characterized in that, A sealing groove for accommodating a sealing ring is provided on the core body.

9. The live connection fitting according to claim 1, characterized in that, An inverted tooth ring is provided on the core body, there are more than two inverted tooth rings, and the more than two inverted tooth rings are arranged in sequence along the axis direction of the core body.

10. The live connection fitting according to claim 1, characterized in that, A flared mouth is provided at the end of the sleeve away from the retaining ring.

Images