Quick anti-falling pipe joint of corrugated pipe for fuel gas conveying

Abstract

The utility model relates to a quick anti-drop pipe joint of a corrugated pipe for gas delivery, which comprises a main joint, a snap ring, an annular sealing ring and an auxiliary joint, the main joint is provided with a straight-through inner hole penetrating through the corrugated pipe, one section of the straight-through inner hole is an internal thread section, and the thread inner diameter of the internal thread section is consistent with the aperture of the straight-through inner hole; the auxiliary connector is provided with an external thread section matched with the internal thread section. Guide grooves parallel to the axial direction of the straight-through inner hole are evenly distributed in the inner thread section in the circumferential direction, inclined guide faces are formed at the inner ends of the guide grooves, the clamping ring is composed of two semi-rings, sliding blocks in sliding fit with the guide grooves are evenly distributed on the outer ring of the clamping ring, and inclined faces matched with the inclined guide faces at the inner ends of the guide grooves are arranged at one ends of the sliding blocks. When the inclined face abuts against the inclined guide face, necking clamping force is applied to the clamping ring, namely the corrugated pipe is clamped, and the annular sealing ring abuts against the position between the pipe end of the corrugated pipe and the end of the internal thread section of the auxiliary connector to form sealing. The structure is simple, machining and manufacturing are easy, the size is small, corrugated pipe connection is convenient and reliable to use, and the anti-disengaging performance is good.

Description

Technical Field

[0001] The utility model relates to the field of gas pipe joints and is a quick anti - detachment pipe joint for corrugated pipes used in gas transmission. Background Technique

[0002] Existing gas pipe joints usually adopt the method of threaded docking of main and auxiliary joints to form effective connection and sealing. The pipe fittings used are usually corrugated pipes. The corrugated pipe has a wave groove structure, which is convenient to form an anti - detachment state through a snap - ring structure, thus ensuring the use safety of the gas pipeline. For existing anti - detachment joints of corrugated pipes, such as the utility model patent document published with the authorization announcement number CN220540544U, the authorization announcement date of February 27, 2024, and the utility model name of "a stainless - steel corrugated pipe joint", it includes a main joint, a ferrule nut, a soft sealing rubber sleeve, and two hard retaining rings. The retaining rings are semi - circular, and the inner wall shape of the retaining rings corresponds to the outer wall shape of the sealing rubber sleeve. One end of the retaining ring in the axial direction is formed with an outward flange. The two retaining rings are spliced into a cylinder and are sealingly fitted inside one end port of the main joint. The cylinder tightly surrounds the part of the stainless - steel corrugated pipe with the sealing rubber sleeve. The outward flange of the retaining ring abuts against the port of the main joint, thus forming an effective anti - detachment state for the corrugated pipe. In the above structure, the ferrule nut needs to be designed with a threaded port for threaded connection with the main joint, and at the same time, an inner groove structure for limiting the outward flange of the retaining ring needs to be set. This kind of joint is obviously relatively complex in structure and large in size. For some special installation environments, the large size of the joint will cause problems such as inconvenient pipe threading or pipe connection in a narrow space. Therefore, it is necessary to improve the existing anti - detachment pipe joints of corrugated pipes. Summary of the Invention

[0003] To overcome the above deficiencies, the purpose of the utility model is to provide a quick anti - detachment pipe joint for corrugated pipes used in gas transmission to the field, so as to solve the technical problems that the existing similar pipe joints are relatively complex in structure, large in size, and inconvenient for pipe threading or pipe connection in a narrow space. Its purpose is achieved through the following technical solutions.

[0004] A quick anti-disconnection pipe joint for gas transmission bellows. The pipe joint includes a main joint, a snap ring, an annular sealing ring, and a sub-joint. The main joint is provided with a straight-through inner hole for threading the bellows. One section of the straight-through inner hole is an internal thread section, and the thread inner diameter of the internal thread section is the same as the aperture of the straight-through inner hole. The sub-joint is provided with an external thread section that mates with the internal thread section. The key structural point is that the internal thread section of the main joint is circumferentially and evenly provided with guiding grooves parallel to the axial direction of the straight-through inner hole. The notch of the guiding groove is flush with the open end of the internal thread section, and the inner end of the guiding groove forms an inclined guide surface. The snap ring is composed of two half rings. The outer ring of the snap ring is evenly provided with sliding blocks that slidably cooperate with the guiding grooves in the circumferential direction of the internal thread section, and one end of the sliding block is provided with an inclined surface that matches the inclined guide surface at the inner end of the guiding groove. When the inclined surface abuts against the inclined guide surface, a force for constricting and clamping the snap ring is formed. The inner ring of the snap ring is provided with a snap ring that snap-fits with the wave grooves of the bellows. When the wave grooves near the pipe end of the bellows are sleeved on the snap ring, the snap ring is limited to the inner end of the guiding groove through the sliding block, that is, the snap ring forms an anti-disconnection state for the bellows. The annular sealing ring abuts between the pipe end of the bellows and the end of the internal thread section of the sub-joint to form a seal. Through the above structure, the main joint adopts a straight-through inner hole design, with a relatively simple structure, effectively reducing the outer wall size of the main joint, making the overall size of the pipe joint small and easy for pipe threading or pipe connection operations in narrow spaces. At the same time, the internal thread section is directly cut in the straight-through inner hole, and the guiding groove is directly ground in the internal thread section. The guiding groove guides and limits the sliding block of the snap ring, thus effectively reducing the space occupied by the snap ring in the inner hole of the main joint. In addition, when the inclined surface of the sliding block of the snap ring abuts against the inclined guide surface at the inner end of the guiding groove, the snap ring clamps the bellows more reliably, thereby improving the anti-disconnection performance of the bellows.

[0005] The guiding groove is a concave circular arc groove, and the corresponding sliding block of the snap ring is an arc block. Through this structure, the guiding groove not only realizes axial sliding guidance for the sliding block, but also when the snap ring rotates circumferentially with the sub-joint and the annular sealing ring to form circumferential tracking rotation, the arc surface of the sliding block cooperates with the circular arc groove of the guiding groove to further form a force for constricting and clamping the snap ring, thereby further clamping and preventing disconnection of the bellows, and the anti-disconnection is more reliable.

[0006] The outer ring of the snap ring is evenly provided with sliding blocks that are symmetrically distributed around the annular center, and the snap ring is divided into two symmetric half rings. Through this structure, the snap ring is limited and stressed more evenly.

[0007] The snap ring is divided into two half rings along the center of a pair of symmetric sliding blocks. Through this structure, the state of clamping the bellows by the two half rings is more stable, and it is not easy to cause the two half rings to be displaced due to uneven tensile force of the bellows.

[0008] The number of sliding blocks of the snap ring is six. This structure is the preferred structure for implementation.

[0009] A gap for the thickness of the protective sleeve is left between the inner diameter of the straight-through inner hole of the main joint and the outer diameter of the corrugated pipe. With this structure, it is convenient to externally connect a protective sleeve to the corrugated pipe.

[0010] The size of the middle annular body of the snap ring, excluding the slider and the snap ring, is not greater than the gap between the inner diameter of the straight-through inner hole of the main joint and the outer diameter of the corrugated pipe. With this structure, it is convenient to assemble and use the snap ring.

[0011] The overall structure of the present utility model is relatively simple, easy to process and manufacture, small in size, the connection of the corrugated pipe is more convenient and reliable, has good anti-disconnection performance, and is suitable for pipe threading or pipe connection in narrow spaces. Description of the Drawings

[0012] Figure 1 is a schematic cross-sectional structure diagram of the present utility model in the use state.

[0013] Figure 2 is a schematic three-dimensional structure diagram of the main joint of this figure.

[0014] Figure 3 is Figure 2 a schematic structure diagram of the snap ring assembled in

[0015] Figure 4 is Figure 1 a schematic structure diagram of the snap ring of

[0016] Figure 5 is Figure 4 a schematic plan structure diagram of

[0017] Figure 6 is Figure 5 an improved schematic structure diagram of

[0018] The numbers and names in the figure are: 1, main joint; 101, straight-through inner hole; 102, internal thread section; 103, guide groove; 104, inclined guide surface; 2, sub-joint; 201, external thread section; 3, snap ring; 301, slider; 302, snap ring; 303, inclined surface; 4, annular sealing ring; 5, corrugated pipe; 6, protective sleeve. Detailed Embodiments

[0019] Now, in combination with the drawings, the present utility model will be further described.

[0020] As shown in Figures 1 - 5As shown in the figure, the quick anti - detachment pipe joint for gas - conveying bellows includes a main joint 1, a snap ring 3, an annular sealing ring 4, and a sub - joint 2. The main joint 1 is provided with a straight - through inner hole 101 for threading through the bellows 5, and the aperture of the straight - through inner hole 101 matches the outer diameter of the bellows 5 after being sleeved with a protective sleeve 6. One section of the straight - through inner hole 101 is directly cut to form an internal thread section 102, that is, the thread inner diameter of the internal thread section 102 is the same as the aperture of the straight - through inner hole 101. The sub - joint 2 is provided with an external thread section 201 that mates with the internal thread section 102, and an annular end face for pressing against the annular sealing ring 4 is formed on the end face of the external thread section 201. The internal thread section 102 of the main joint 1 is circumferentially and uniformly provided with guiding grooves 103 that are parallel to the axis of the straight - through inner hole 101 and are centrosymmetric. In the figure, the number of guiding grooves 103 is six. The notch of the guiding groove 103 is flush with the open end of the internal thread section 102, and an inclined guide surface 104 is formed at the inner end of the guiding groove 103. The above - mentioned snap ring 3 is composed of two half - rings, and during production, the integral snap ring 3 is symmetrically cut to form two symmetrical half - rings. The outer ring of the snap ring 3 is provided with sliding blocks 301 that are slidably matched with the guiding grooves 103 in the circumferential direction of the internal thread section 102, that is, the snap ring 3 is provided with six sliding blocks 301 that are annularly and centrosymmetrically distributed, and one end of each sliding block 301 is provided with an inclined surface 303 that matches the inclined guide surface 104 at the inner end of the guiding groove 103. When the inclined surface 303 abuts against the inclined guide surface 104, a force for shrinking and clamping the snap ring 3 is formed, resulting in a better clamping effect. The inner ring of the above - mentioned snap ring 3 is provided with a snap ring 302 that is snap - fitted with the wave groove of the bellows 5. After the wave groove near the pipe end of the bellows 5 is sleeved with the snap ring 3, the snap ring 3 is limited to the inner end of the guiding groove 103 through the sliding blocks 301, that is, the snap ring 3 forms an anti - detachment state for the bellows 5. The size of the middle annular body of the above - mentioned snap ring 3 except for the sliding blocks 301 and the snap ring 302 is not larger than the gap between the inner diameter of the straight - through inner hole 101 of the main joint 1 and the outer diameter of the bellows 5. The above - mentioned annular sealing ring 4 abuts tightly between the pipe end of the bellows 5 and the end of the internal thread section 102 of the sub - joint 2 to form a seal.

[0021] The above - mentioned guiding groove 103 is an inward - concave circular arc groove, and the sliding block 301 of the corresponding snap ring 3 is an arc block. When the snap ring 3 rotates circumferentially and follows the rotation with the sub - joint 2 and the annular sealing ring 4, by using the cooperation between the arc block and the arc groove, a force for shrinking and clamping the snap ring 3 is further formed, thereby further clamping and preventing the detachment of the bellows 5.

[0022] As Figure 6 shown, the above - mentioned snap ring 3 can also be centrally divided along one pair of symmetrical sliding blocks 301 to form two half - rings, so that the state of clamping the two half - rings with the bellows 5 is more stable, and it is not easy to cause the deviation of the two half - rings due to uneven tension of the bellows 5.

[0023] The usage method of this pipe joint is as follows: First, one end of the corrugated pipe 5 connecting the protective sleeve 6 is passed through the straight inner hole 101 of the main joint 1. The snap ring 3 is assembled at the corrugated groove near the port of the corrugated pipe 5, that is, the two half rings are clamped and assembled at the corrugated groove. Then, the slider 301 of the snap ring 3 is aligned with the guiding groove 103 of the internal thread section 102 of the main joint 1, and the corrugated pipe 5 is pulled to make the slider 301 of the snap ring 3 slide to the end along the guiding groove 103 until the snap ring 3 forms an effective anti-detachment state for the corrugated pipe 5. Finally, an annular sealing ring 4 is inserted into the internal thread section 102 of the main joint 1, and at the same time, the sub-joint 2 is screwed in. By using the thread tightening force between the main joint 1 and the sub-joint 2, the end face of the external thread section 201 of the sub-joint 2 is pressed against the annular sealing ring 4 until the annular sealing ring 4 forms an effective seal between the pipe end of the corrugated pipe 5 and the end face of the external thread section 201 of the sub-joint 2, that is, the anti-detachment and sealing connection of the corrugated pipe 5 of this pipe joint is completed.

[0024] The above content is intended to illustrate the technical means of the present invention and does not limit the technical scope of the present invention. Obvious improvements or replacements made by those skilled in the art to the present invention in combination with the existing common general knowledge also fall within the protection scope of the claims of the present invention.

Claims

1. A quick anti-disconnection pipe joint for gas transmission. The pipe joint includes a main joint (1), a snap ring (3), an annular sealing ring (4), and a sub-joint (2). The main joint (1) is provided with a straight-through inner hole (101) for threading through a corrugated pipe (5). One section of the straight-through inner hole (101) is an internal thread section (102), and the thread inner diameter of the internal thread section (102) is the same as the aperture of the straight-through inner hole (101). The sub-joint (2) is provided with an external thread section (201) that mates with the internal thread section (102); characterized in that The inner thread section (102) of the main joint (1) is circumferentially and uniformly provided with guiding grooves (103) parallel to the axial direction of the straight-through inner hole (101). The notch of the guiding groove (103) is flush with the open end of the inner thread section (102). The inner end of the guiding groove (103) forms an inclined guide surface (104). The snap ring (3) is composed of two half rings. The outer ring of the snap ring (3) is circumferentially and uniformly provided with sliding blocks (301) that are slidably matched with the guiding grooves (103) in the circumferential direction of the inner thread section (102). One end of the sliding block (301) is provided with an inclined surface (303) that matches the inclined guide surface (104) at the inner end of the guiding groove (103). When the inclined surface (303) abuts against the inclined guide surface (104), a force for necking and clamping the snap ring (3) is formed. The inner ring of the snap ring (3) is provided with a snap ring (302) that is snap-fitted with the wave grooves of the corrugated pipe (5). After the wave grooves near the pipe end of the corrugated pipe (5) are sleeved on the snap ring (3), the snap ring (3) is limited to the inner end of the guiding groove (103) through the sliding block (301), that is, the snap ring (3) forms an anti-disconnection state for the corrugated pipe (5). The annular sealing ring (4) abuts between the pipe end of the corrugated pipe (5) and the end of the inner thread section (102) of the sub-joint (2) to form a seal.

2. The quick anti-disconnection pipe joint for corrugated pipes used in gas transmission according to claim 1, characterized in that The guiding groove (103) is a concave circular arc groove, and the corresponding sliding block (301) of the snap ring (3) is a circular arc block.

3. The quick anti-disconnection pipe joint for corrugated pipes used in gas transmission according to claim 1, characterized in that The outer ring of the snap ring (3) is circumferentially and uniformly provided with sliding blocks (301) that are symmetrically distributed around the ring center, and the snap ring (3) is divided into two symmetrical half rings.

4. The quick anti-disconnection pipe joint for corrugated pipes used in gas transmission according to claim 3, characterized in that The snap ring (3) is divided into two half rings along the center of a pair of symmetrical sliding blocks (301).

5. The quick anti-disconnection pipe joint for corrugated pipes used in gas transportation according to claim 3, characterized in that The number of sliding blocks (301) of the snap ring (3) is six.

6. The quick anti-disconnection pipe joint for corrugated pipe used in gas transmission according to claim 1, characterized in that A gap with the thickness of the protective sleeve (6) is left between the inner diameter of the straight-through inner hole (101) of the main joint (1) and the outer diameter of the corrugated pipe (5).

7. The quick anti-disconnection pipe joint for corrugated pipes used in gas transmission according to claim 1 or 6, characterized in that The size of the middle annular body of the snap ring (3) excluding the sliding block (301) and the snap ring (302) is not larger than the gap between the inner diameter of the straight-through inner hole (101) of the main joint (1) and the outer diameter of the corrugated pipe (5).

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