A stainless steel bellows integrated hard surface sealed pipe joint

Abstract

The present invention relates to the technical field of sealed pipe joints, and specifically relates to a stainless steel corrugated pipe integrated hard surface sealed pipe joint; it includes a fixed sleeve, and a threaded connection part for connecting with a gas appliance is provided at the end of the fixed sleeve; a movable compression sleeve is screwed on the front end of the fixed sleeve, and an extrusion part extending into the fixed sleeve is further provided at the front end of the movable compression sleeve; there is a gap between the extrusion part and the fixed sleeve, and the gap forms a deformation section; a seal that is limited in the fixed sleeve by a damping ring is also attached to the inner wall of the front end of the fixed sleeve, and a metal snap ring that is coaxially and movably arranged in the deformation section is used to hoop and edge-seal the end of the gas corrugated pipe to ensure the sealed connection between the corrugated pipe and the gas appliance; the present application adopts a new sealing structure, does not need to be disassembled, and uses a metal seal to seal, with high temperature resistance, good sealing effect and not easy to age; long service life and high installation coefficient.

Description

Technical Field

[0001] The present invention relates to the technical field of sealed pipe joints, and specifically relates to a stainless steel corrugated pipe integrated hard surface sealed pipe joint. Background Art

[0002] With the large-scale popularization and use of stainless steel corrugated hoses for gas, it has currently become one of the main pipe materials for domestic gas pipelines. With continuous technological progress, the pipe material itself fully meets or exceeds the national standard requirements. However, the corresponding joints mainly still use flexible seals such as rubber. Pipe joints with flexible seals such as rubber have the following problems: First, the components of rubber are diverse, and the aging test report lifespan only applies to the tested products, with a testing cycle as long as half a year, which leads to the problem that the actual aging lifespan of rubber products cannot be guaranteed; Second, the maximum temperature resistance of rubber parts is 150°C - 200°C, and they are prone to melting or burning during a fire, resulting in gas leakage and triggering secondary disasters; Third, some snap rings of corrugated pipe joints are made of plastic or a plastic plus metal material structure. This material is prone to generating a phenomenon similar to the second one at high temperatures, and plastic is prone to low-temperature brittleness at low temperatures, resulting in seal failure and gas leakage problems.

[0003] To solve the above problems, through technical research and improvement, combined with currently commonly used metal sealing materials, and cooperating with metal snap rings to achieve the effect of not failing at high and low temperatures, reducing gas leakage accidents caused by seal failure, effectively improving gas use safety, the improved metal round snap ring effectively saves costs and improves the safety factor. Summary of the Invention

[0004] In view of the above problems, a stainless steel corrugated pipe integrated hard surface sealed pipe joint is provided. Through a new sealing method and a new installation structure, the technical problems in the prior art that the rubber seal of the sealed pipe joint and the snap rings of some corrugated pipe joints are made of plastic or a plastic plus metal material structure are prone to melting, aging, and have cumbersome installation steps are solved.

[0005] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0006] A stainless steel corrugated pipe integrated hard surface sealed pipe joint includes a fixed sleeve, and a threaded connection part for connecting with a gas appliance is provided at the end of the fixed sleeve; a movable compression sleeve is screwed on the front end of the fixed sleeve, and an extrusion part extending into the fixed sleeve is further provided at the front end of the movable compression sleeve; a gap is left between the extrusion part and the fixed sleeve, and the gap forms a deformation section; a seal member limited in the fixed sleeve by a damping ring is also attached to the inner wall of the front end of the fixed sleeve, and a metal snap ring is coaxially and movably arranged in the deformation section to hoop and edge-seal the end of the gas corrugated pipe to ensure the sealed connection between the corrugated pipe and the gas appliance.

[0007] Preferably, the fixed sleeve includes a first fastening portion and a connecting portion; the connecting portion is coaxially and fixedly arranged at the end of the first fastening portion and integrally formed with the first fastening portion; a first air inlet passage is coaxially and penetratingly provided through the middle of the connecting portion and the first fastening portion; a first passage and a second passage are coaxially provided in sequence in the first fastening portion from the end towards the connecting portion; the inner diameter of the second passage is smaller than that of the first passage; the inner diameter of the first air inlet passage is smaller than that of the second passage; an internal thread for connecting with the front end of the movable pressing sleeve is provided on the inner wall of the first passage.

[0008] Preferably, the first fastening portion further includes a guiding inclined surface provided at the connection of the first passage and the second passage for guiding the contraction of the metal snap ring, and a sealing inclined surface is provided at one end of the second passage away from the first passage, and the sealing member is attached to the sealing inclined surface and limited in the second passage by a damping ring.

[0009] Preferably, the movable pressing sleeve includes a second fastening portion and an extrusion portion; the extrusion portion is coaxially and fixedly arranged at the end of the second fastening portion; a second air inlet passage coaxially corresponding to the first air inlet passage is coaxially and penetratingly provided through the middle of the extrusion portion and the first fastening portion; an annular groove is provided on the inner wall of the second fastening portion, and the protective sealing ring is embedded in the annular groove; an external thread for screwing with the front end of the fixed sleeve is spirally provided on the outer wall of the extrusion portion.

[0010] Preferably, the protective sealing ring is made of rubber material.

[0011] Preferably, a leakage detection hole is radially and penetratingly provided on the second fastening portion from the inside to the outside, and the leakage detection hole is provided near the connection of the second fastening portion and the extrusion portion.

[0012] Preferably, the sealing member is a ring-shaped red copper metal material formed by stamping.

[0013] Preferably, the damping ring is made of rubber material.

[0014] Preferably, a limiting ring is also clamped between the fixed sleeve and the movable pressing sleeve.

[0015] The beneficial effects of the present invention compared with the prior art are as follows:

[0016] 1. In the present invention, the sealing member is coaxially limited and blocked in the fixed sleeve by the damping ring and used as the sealing member at the contact between the gas bellows and the inner wall of the fixed sleeve. By utilizing the characteristic that the sealing member itself is made of soft metal materials such as red copper, the sealing member will undergo appropriate deformation under the action of the extrusion force and effectively fit with the contacted materials, thereby achieving the sealing effect; compared with the rubber material used for the sealing member of the traditional pipe joint, while ensuring good sealing performance, the high temperature resistance of the sealing member is greatly improved, so that the safety factor is greatly improved, and secondary disasters caused by gas leakage due to high temperature melting will not occur.

[0017] 2. The present invention realizes how to limit the position between the fixed sleeve and the movable pressing sleeve in the non-use state through a limiting ring, so that a deformation section is always left between the fixed sleeve and the movable pressing sleeve; no secondary adjustment is required, making the connection of the gas bellows faster and more efficient; there is no need to disassemble the pipe joint one by one and put on the sleeve one by one like a traditional pipe joint, which is time-consuming and laborious and has low installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of a stainless steel bellows integrated hard surface seal pipe joint;

[0019] Figure 2 is an exploded perspective structural schematic diagram of a stainless steel bellows integrated hard surface seal pipe joint;

[0020] Figure 3 is a side view of a stainless steel bellows integrated hard surface seal pipe joint in the non-working state;

[0021] Figure 4 is Figure 3 a sectional perspective view taken along line A-A of

[0022] Figure 5 is an exploded side view of a stainless steel bellows integrated hard surface seal pipe joint;

[0023] Figure 6 is Figure 5 a sectional view taken along line C-C of

[0024] Figure 7 is a side view of a stainless steel bellows integrated hard surface seal pipe joint in the working state;

[0025] Figure 8 is Figure 7 a sectional view taken along line B-B of

[0026] The reference numerals in the figures are:

[0027] 1 - fixed sleeve; 11 - first fastening part; 111 - first channel; 112 - second channel; 113 - guiding inclined surface; 114 - sealing inclined surface; 12 - connecting part; 13 - first air inlet channel;

[0028] 2 - movable pressing sleeve; 21 - second fastening part; 22 - extrusion part; 23 - protective sealing ring; 24 - leakage detection hole; 25 - second air inlet channel; 26 - limiting ring;

[0029] 3 - seal;

[0030] 4 - damping ring; 5 - metal snap ring. DETAILED DESCRIPTION OF THE INVENTION

[0031] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] See also Figures 1 to 8 Shown:

[0033] A stainless steel bellows integrated hard-face sealing pipe joint, comprising a fixed sleeve 1, a threaded connection portion 12 connected to a gas appliance is provided at the end of the fixed sleeve 1; a movable compression sleeve 2 is threadedly arranged at the front end of the fixed sleeve 1, and the front end of the movable compression sleeve 2 is also provided with an extrusion portion 22 that penetrates into the fixed sleeve 1; a gap is left between the extrusion portion 22 and the fixed sleeve 1, and the gap forms a deformation section; it is characterized in that a sealing member 3 that is limited in the fixed sleeve 1 by a damping ring 4 and a metal clamp 5 that is coaxially and movably arranged in the deformation section are also attached to the inner wall of the front end of the fixed sleeve 1 to clamp and seal the edge of the gas bellows end to ensure a sealed connection between the bellows and the gas appliance.

[0034] In the working state, when it is necessary to connect the gas bellows and the gas appliance, the staff first takes the pre-assembled fixed sleeve 1 and the movable compression sleeve 2, and then screws the end of the fixed sleeve 1 provided with the threaded connection part 12 to the gas appliance, and then takes the gas bellows with a proper amount of coating removed in advance; and inserts the exposed bellows from the end of the movable compression sleeve 2 into the movable compression sleeve 2, so that the gas bellows continues to conduct toward the fixed sleeve 1 until the front end of the bellows stretches the metal clamping ring 5 and a clamping sound is heard, which means that the metal clamping ring 5 is clamped into the trough of the bellows; in order to further ensure that the bellows is clamped with the metal clamping ring 5, the staff can judge whether the gas bellows is successfully clamped by slightly pulling the gas bellows back. If it encounters obstruction in the subsequent process, it means that the gas bellows is connected successfully. The gas bellows is successfully connected. If the gas bellows can be easily pulled out, it means that the gas bellows has failed to be clamped and needs to be pushed again. After the successful clamping, the gas bellows is located in the deformation section. Finally, the movable compression sleeve 2 is rotated to make the extrusion part 22 slowly approach the fixed sleeve 1. During the approaching process, the extrusion part 22 pushes the metal clamping ring 5 to move forward synchronously. During the moving process, the metal clamping ring 5 is guided by the inner wall of the fixed sleeve 1 to shrink and completely tighten into the trough. At this time, the front end of the bellows will also contact the sealing member 3. At this time, the movable compression sleeve 2 is continued to be screwed by the tool. At this time, the bellows located in the deformation section will be deformed and piled up onto the sealing member 3 under the limiting extrusion of the extrusion part 22 and the metal clamping ring 5, thereby completing the sealed connection between the gas bellows and the pipe joint. The fixed sleeve 1 and the movable compression sleeve 2 are both made of metal.

[0035] See also Figure 2 and Figure 6 Shown:

[0036] The fixed sleeve 1 includes a first fastening portion 11 and a connecting portion 12; the connecting portion 12 is coaxially and fixedly arranged at the end of the first fastening portion 11 and is integrally formed with the first fastening portion 11; a first air inlet passage 13 is coaxially formed through the middle of the connecting portion 12 and the first fastening portion 11; a first passage 111 and a second passage 112 are coaxially formed in the first fastening portion 11 in sequence from the end towards the connecting portion 12; the inner diameter of the second passage 112 is smaller than that of the first passage 111; the inner diameter of the first air inlet passage 13 is smaller than that of the second passage 112; an internal thread for connecting with the front end of the movable pressing sleeve 2 is formed on the inner wall of the first passage 111.

[0037] In the non-use state, the fixed sleeve 1 and the movable pressing sleeve 2 are screwed together, and the metal snap ring 5 is also in an expanded state and located in the first passage 111; the seal 3 is coaxially blocked in the second passage 112 through the damping ring 4. In the working state, when the gas bellows is inserted into its interior from the end of the movable pressing sleeve 2 and is sleeved with the metal snap ring 5 under the operation of the staff; the movable pressing sleeve 2 is driven to rotate by a tool so that the pressing portion 22 moves synchronously closer to the metal snap ring 5, and finally pushes the metal snap ring 5 closer to the second passage 112 until the front end of the gas bellows deforms and accumulates outside the seal 3, so that the seal 3 fits more closely with the end wall of the second passage 112; thereby realizing the sealed connection between the gas bellows and the gas appliance.

[0038] See Figure 6 as shown in:

[0039] The first fastening portion 11 further includes a guiding inclined surface 113 formed at the connection of the first passage 111 and the second passage 112 for guiding the contraction of the metal snap ring 5, and a sealing inclined surface 114 is formed at the end of the second passage 112 away from the first passage 111. The seal 3 is arranged in contact with the sealing inclined surface 114 and is limited in the second passage 112 through the damping ring 4.

[0040] The included angle between the sealing inclined surface 114 and the side wall of the second channel 112 is an acute angle; the seal 3 is limited within the second channel 112 by the damping ring 4, which can effectively ensure the stability of the seal 3 in the non-use state; the damping ring 4 makes the seal 3 always firmly adhere to the sealing inclined surface 114; the guiding inclined surface 113 is used to guide the metal snap ring 5 in the driven state. The metal snap ring 5 is an elastic constriction ring in a C shape and is made of soft metal materials such as copper or aluminum. The inner diameter of the metal snap ring 5 is slightly smaller than the outer diameter of the corrugated pipe. When inserting the corrugated pipe, the metal snap ring 5 is expanded. The metal snap ring 5 is at the trough position of the corrugated pipe. During the tightening process of the movable compression sleeve 2, a thrust is generated. Under the action of the thrust and the guiding inclined surface 113, the metal snap ring 5 deforms, so that the metal snap ring 5 fits with the trough of the corrugated pipe to form a complete circle, and the first wave of the corrugated pipe contacts the seal 3. Then, when the movable compression sleeve 2 is further screwed down, the first wave of the corrugated pipe deforms and fits with the seal 3 for sealing; after the metal snap ring 5 fits with the trough and deforms, the corrugated pipe cannot be pulled out under the block of the movable compression sleeve 2, and thus the sealing connection between the gas corrugated pipe and the gas stove is completed.

[0041] See Figure 6 as shown in:

[0042] The movable compression sleeve 2 includes a second fastening portion 21 and an extrusion portion 22; the extrusion portion 22 is coaxially and fixedly arranged at the end of the second fastening portion 21; a second air inlet channel 25 corresponding to the first air inlet channel 13 is coaxially and penetratingly opened in the middle of the extrusion portion 22 and the first fastening portion 11; an annular groove is also opened on the inner wall of the second fastening portion 21, and the protective sealing ring 23 is embedded in the annular groove; an external thread for screwing with the front end of the fixed sleeve 1 is spirally opened on the outer wall of the extrusion portion 22.

[0043] In the working state, when the staff drives the second fastening portion 21 to rotate, the extrusion portion 22 will synchronously follow the second fastening portion 21 to rotate and approach the fixed sleeve 1, thereby realizing the effect of pushing the metal snap ring 5 forward through the extrusion portion 22 to squeeze the end of the gas corrugated pipe to deform and abut against the seal 3 for sealing; the protective sealing ring 23 coaxially and embedded in the second fastening portion 21 is used to effectively block dust from entering the inside of the movable compression sleeve 2 from the end while realizing sealing through the flexible contact between the protective sealing ring 23 and the outer coating of the gas corrugated pipe when the gas corrugated pipe is inserted into the inside of the movable compression sleeve 2, achieving a dust-proof effect.

[0044] See Figure 4 and Figure 6 as shown in:

[0045] The protective sealing ring 23 is made of rubber material.

[0046] The protective sealing ring 23 coaxially embedded in the second fastening part 21 is used to flexibly contact the outer coating layer of the gas bellows through the protective sealing ring 23 after the gas bellows is inserted into the movable compression sleeve 2, thereby achieving sealing and effectively blocking dust from entering the interior of the movable compression sleeve 2 from the end thereof, thereby playing a protective role in preventing external liquid and dust from entering the pipe body.

[0047] See also Figure 4 Shown:

[0048] A leakage detection hole 24 is radially formed on the second fastening portion 21 from the inside to the outside. The leakage detection hole 24 is disposed near the connection between the second fastening portion 21 and the extrusion portion 22 .

[0049] Under the working state, the end of the gas bellows is driven by the movable compression sleeve 2 to deform and seal against the sealing member 3, and the outer wall of the gas bellows near the rear end of the movable compression sleeve 2 is also sealed and isolated through the protective sealing ring 23. From then on, a sealed cavity is formed in the movable compression sleeve 2. Under the gas transmission state, once a gas leak occurs at the end of the gas bellows, the gas will fill the sealed cavity and flow out along the leakage detection hole 24. After the staff has connected the gas bellows to the gas cooker, if they want to detect the sealing of the connection, they only need to apply soapy water toward the leakage detection hole 24 or use professional equipment to detect whether there is a gas leak at the leakage detection hole 24.

[0050] See also Figure 2 and Figure 3 Shown:

[0051] The sealing member 3 is a stamped annular copper metal material.

[0052] The seal 3 can also be made of soft metal materials such as aluminum, and stamped into a sloped form to facilitate fitting with its sealing slope 114, thereby facilitating the installation of the bellows; the flexible metal material will produce an appropriate amount of deformation under the action of the extrusion force and effectively fit with the contacting material, thereby achieving a sealing effect.

[0053] See also Figure 4 Shown:

[0054] The damping ring 4 is made of rubber.

[0055] The damping ring 4 made of rubber material can play a good role in positioning the seal 3 by utilizing the resistance between itself and the inner wall of the second channel 112. At the same time, it can be deformed when the bellows is installed, wrapping the side of the bellows, further achieving a sealing effect, and greatly improving the sealing performance of the joint.

[0056] See also Figure 2 and Figure 4 Shown:

[0057] A limiting ring 26 is also clamped between the fixed sleeve 1 and the movable pressing sleeve 2.

[0058] The limiting ring 26 is made of metal or plastic, so that there is always a deformation section between the fixed sleeve 1 and the movable body, and at the same time, the fixed sleeve 1 and the movable pressing sleeve 2 are always in a tightened state when not in use. When in need of use, only one of the components needs to be slightly rotated to release the limiting ring 26, and then the bellows sealing connection work can be carried out.

[0059] The present application adopts a new sealing structure without disassembly and is sealed with a metal seal, which has high temperature resistance, good sealing effect and is not easy to age; it has a long service life and a high installation coefficient.

[0060] The above embodiments only represent one or several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. An integrated hard surface sealed pipe joint for a stainless steel corrugated pipe, comprising a fixed sleeve (1), and a threaded connection portion (12) connected to a gas appliance is provided at the end of the fixed sleeve (1); a movable compression sleeve (2) is screwed onto the front end of the fixed sleeve (1), and an extrusion portion (22) extending into the fixed sleeve (1) is further provided at the front end of the movable compression sleeve (2); a gap is left between the extrusion portion (22) and the fixed sleeve (1), and the gap forms a deformation section; it is characterized in that, The inner wall of the front end of the fixed sleeve (1) is also provided with a seal (3) which is restricted within the fixed sleeve (1) by a damping ring (4), and a metal snap ring (5) which is coaxially and movably arranged within the deformation section for sleeving and edge sealing the end of the gas bellows to ensure the sealed connection between the bellows and the gas appliance; A first air inlet passage (13) is also coaxially penetrated through the middle parts of the connecting part (12) and the first fastening part (11); a first passage (111) and a second passage (112) are also coaxially arranged in sequence within the first fastening part (11) from the end towards the connecting part (12); the inner diameter of the second passage (112) is smaller than that of the first passage (111); the inner diameter of the first air inlet passage (13) is smaller than that of the second passage (112); an internal thread for connecting with the front end of the movable pressing sleeve (2) is also provided on the inner wall of the first passage (111); The first fastening part (11) further includes a guiding inclined surface (113) opened at the connection of the first passage (111) and the second passage (112) for guiding the contraction of the metal snap ring (5), and a sealing inclined surface (114) is also opened at one end of the second passage (112) far from the first passage (111), and the seal (3) is arranged in fit with the sealing inclined surface (114) and is restricted within the second passage (112) by the damping ring (4); The damping ring (4) is made of rubber material, and while positioning the seal (3) by the resistance between itself and the inner wall of the second passage (112), it also plays a role in wrapping the side surface of the bellows; A limit ring (26) is also clamped between the fixed sleeve (1) and the movable pressing sleeve (2).

2. The one-piece hard-faced sealed pipe joint of a stainless steel corrugated pipe according to claim 1, characterized in that The fixed sleeve (1) includes a first fastening part (11) and a connecting part (12); the connecting part (12) is coaxially and fixedly arranged at the end of the first fastening part (11) and is integrally formed with the first fastening part (11).

3. The one-piece hard-face sealed pipe joint of a stainless steel corrugated pipe according to claim 1, characterized in that, The movable pressing sleeve (2) includes a second fastening part (21) and an extrusion part (22); the extrusion part (22) is coaxially and fixedly arranged at the end of the second fastening part (21); a second air inlet passage (25) which is coaxially corresponding to the first air inlet passage (13) is also coaxially penetrated through the middle parts of the extrusion part (22) and the first fastening part (11); an annular groove is also opened on the inner wall of the second fastening part (21), and a protective sealing ring (23) is embedded and installed within the annular groove; an external thread for screwing with the front end of the fixed sleeve (1) is also spirally opened on the outer wall of the extrusion part (22).

4. The one-piece hard-surface sealed pipe joint of a stainless steel corrugated pipe according to claim 3, characterized in that, The protective sealing ring (23) is made of rubber material.

5. A stainless steel bellows integrated hard surface sealed pipe joint according to claim 3, characterized in that, A leakage detection hole (24) is also radially penetrated through the second fastening part (21) from the inside to the outside, and the leakage detection hole (24) is arranged close to the connection of the second fastening part (21) and the extrusion part (22).

6. The one-piece hard-surface sealed pipe joint of a stainless steel corrugated pipe according to claim 1, characterized in that The seal (3) is a ring-shaped copper metal material formed by stamping.

Images