A bellows mechanical seal device for petrochemical applications

Abstract

This invention belongs to the field of bellows sealing, and particularly relates to a bellows mechanical seal device for petrochemical applications. The bellows mechanical seal device for petrochemical applications includes a lower sealing body and an upper sealing body; the lower sealing body is movably connected to the upper sealing body; the lower sealing body has two first limiting grooves; the upper sealing body has two second limiting grooves; each second limiting groove forms a complete circular hole with an adjacent first limiting groove; an air pump is installed in the lower sealing body; the air pump is connected to a first conduit; two first air bladders are installed in the lower sealing body; and two more first air bladders are installed in the upper sealing body. In this invention, the sequential expansion of the second and first air bladders achieves flexible automatic alignment of the bellows port and initial sealing of the bellows port, forming annular pressure on the first and second bellows, dynamically adjusting the position of the bellows port, ensuring precise alignment of the pipe openings, adapting to bellows of different sizes, and improving the installation efficiency and reliability of the seal.

Description

Technical Field

[0001] This invention belongs to the field of bellows sealing technology, specifically a bellows mechanical seal device for petrochemical applications. Background Technology

[0002] In the petrochemical, oil and gas transportation and other industrial fields, corrugated pipes are widely used in pipeline connection systems due to their excellent compensation, vibration reduction and corrosion resistance properties. Reliable sealing is a prerequisite for ensuring the safe and stable operation of pipeline systems and preventing media leakage, environmental pollution and major safety accidents.

[0003] Currently, the existing technologies for connecting and sealing bellows mainly have the following solutions and their inherent defects: 1. Low efficiency in pipe alignment and installation: Traditional methods mostly rely on manual adjustment by skilled workers or the use of simple mechanical clamps, which is inefficient and poses a risk of alignment error; 2. Static sealing and dynamic adaptability: A single sealing method is often difficult to cope with complex working conditions, and existing mechanical seals still have the problem of short service life in the face of severe vibration and long-term dynamic stress.

[0004] Existing patent (CN119857622A) describes a bellows mechanical seal device. It mentions that a spray nozzle can evenly apply sealant to the socket section of the bellows, facilitating operation and solving the problem of low connection efficiency. However, when applied by spraying, the sealant is still fluid before it hardens and converges downwards under gravity. This results in less sealant at the top of the bellows than at the bottom. Under severe vibration and long-term dynamic stress, the sealant's fixing effect at the bellows joint is inconsistent, significantly reducing the sealing effect and easily leading to media leakage. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a bellows mechanical seal device for petrochemical applications. This invention primarily addresses the problems of low efficiency in pipe alignment and installation of existing bellows mechanical seals, and the uneven distribution of sealant applied by spraying due to gravity before solidification, leading to significant differences in fixing effectiveness under vibration and dynamic stress, and thus easily causing media leakage.

[0006] The technical solution adopted by this invention to solve its technical problem is: a bellows mechanical seal device for petrochemicals, comprising a lower sealing body and an upper sealing body; the lower sealing body is movably connected to the upper sealing body; the lower sealing body has two first limiting grooves; the upper sealing body has two second limiting grooves; each second limiting groove forms a complete circular hole with an adjacent first limiting groove; it also includes an air pump, a first conduit, a first air bladder, a limiting unit, an injection unit, a guide ring, a blocking ring, and an exhaust pipe; the lower sealing body is equipped with an air pump; the air pump is connected to the first conduit; the lower sealing body... The sealing body has two first airbags installed; the upper sealing body has two more first airbags installed; each first airbag on the lower sealing body corresponds to one first airbag on the upper sealing body; the lower and upper sealing bodies are each connected to two limiting units, and the first conduit is connected to all the limiting units; the limiting units are used to align the openings of the first and second corrugated pipes; the lower sealing body is connected to an injection unit; the injection unit is connected to a guide ring; a sealing ring is fixed to each side of the guide ring; the guide ring and the sealing rings on both sides form a sealant groove; the injection unit is used to inject sealant into the sealant groove; the sealant groove is connected to an exhaust pipe.

[0007] Furthermore, it is particularly preferred that the limiting unit includes a limiting shell and a second airbag; two limiting shells are fixedly connected to the lower sealing body and the upper sealing body; a second airbag is installed in each limiting shell; each limiting shell on the lower sealing body corresponds to one limiting shell on the upper sealing body; each second airbag on the lower sealing body and one second airbag on the upper sealing body form a complete ring.

[0008] Furthermore, it is particularly preferred that the glue dispensing unit includes a glue box, a glue dispensing tube, an electric push rod, a piston, and a glue guide tube; the glue box is installed inside the lower sealing body; the glue box is connected to the glue dispensing tube; the electric push rod is installed inside the glue box; the piston is fixedly connected to the telescopic part of the electric push rod; the piston is slidably connected to the glue box; the glue box is connected to the glue guide tube; the glue guide tube is connected to the glue tank; and the glue guide tube is detachably connected to the guide ring.

[0009] Furthermore, it is particularly preferred that the piston has a C-shaped groove that mates with the glue guide tube and the glue injection tube.

[0010] Furthermore, it is particularly preferred that both the first limiting groove and the second limiting groove are provided with sponge strips.

[0011] Furthermore, it is particularly preferred that a solenoid valve is installed on the first conduit.

[0012] In addition, it is particularly preferred that a dustproof screen is provided at the air inlet end of the air pump, and the first conduit is connected to the air pump at the air outlet end.

[0013] Furthermore, it is particularly preferred that the device also includes a second conduit; the first conduit is connected to the second conduit; a solenoid valve is installed on the second conduit; a heating sleeve is provided on the second conduit; an airflow channel is opened inside the guide ring; the second conduit is connected to the airflow channel; the second conduit and the guide ring are detachably connected; all the adhesive-resistant rings have several air holes; heat-shrinkable portions are provided on the opposite sides of the two adhesive-resistant rings; the air holes on each adhesive-resistant ring face the adjacent heat-shrinkable portions; the airflow channel is connected to all the air holes.

[0014] Furthermore, it is particularly preferred that the device also includes a connecting rod, a fixing bracket, and a sealing plate; the fixing bracket is slidably connected inside the exhaust pipe; a pressure sensor is provided at the lower part of the fixing bracket; the connecting rod is fixedly connected to the fixing bracket; a sealing plate is fixedly connected to the upper part of the connecting rod; and the sealing plate is in contact with the exhaust pipe.

[0015] Furthermore, it is particularly preferred that the sealing sheet is made of silicone, and that the middle part of the sealing sheet is connected to the connecting rod.

[0016] The beneficial effects of this invention are as follows: 1. In this invention, the sequential expansion of the second airbag and the first airbag achieves flexible automatic alignment of the bellows port and initial sealing of the bellows port, forms annular pressure on the first and second bellows, dynamically adjusts the position of the bellows port, ensures precise alignment of the pipe opening, adapts to bellows of different sizes, and improves the installation efficiency and reliability of the seal.

[0017] 2. In this invention, the sealant is filled into the glue tank from bottom to top, ensuring that the sealant is filled tightly and effectively avoiding the presence of air residue in the sealant that would affect the sealing effect. In the prior art, glue injection sealing often relies on simple injection, which can easily lead to leakage or the formation of voids.

[0018] 3. In this invention, the guide tube, the second guide tube, and the guide ring are detachably connected. By rotating the device, the connection between the guide ring and the guide tube and the second guide tube can be disconnected, and the device can be moved away from that position. This allows it to be used in switching between different specifications of corrugated pipes, thus expanding its application range.

[0019] 4. In this invention, by providing sponge strips on both the first limiting groove and the second limiting groove, it can not only adapt to the fixing of first and second corrugated pipes of different specifications, but also enhance the buffering effect and further adapt to vibration and impact in the petrochemical environment.

[0020] 5. In this invention, air is pumped and flows in the airflow channel. The flowing air cools the sealant in the glue tank, which makes the sealant cure quickly, making the bellows sealing more efficient and giving the device higher practical value in industrial applications. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the bellows mechanical seal device for petrochemical industry in this invention; Figure 2 This is a three-dimensional structural diagram of the first view of the installation positions of the first and second corrugated pipes in this invention. Figure 3 This is a two-dimensional structural diagram of the installation positions of the first and second corrugated pipes in this invention from a second perspective. Figure 4 This is a schematic diagram of the internal structure of the lower sealing body and the upper sealing body in this invention; Figure 5 This is a schematic diagram showing the installation positions of the first airbag, the limiting shell, and the second airbag in this invention; Figure 6 This is a schematic diagram showing the installation positions of the air pump and the first conduit in this invention; Figure 7 This is a schematic diagram showing the inflation direction of the first airbag in this invention; Figure 8 This is a schematic diagram showing the inflation direction of the second airbag in this invention; Figure 9 This is a schematic diagram showing the installation positions of the glue box and glue dispensing tube in this invention; Figure 10 This is a schematic diagram showing the installation positions of the guide ring and the adhesive-resistant ring in this invention; Figure 11 This is a partial cross-sectional view of the guide ring and the adhesive-resistant ring in this invention; Figure 12 This is a schematic diagram of the internal structure of the exhaust pipe in this invention.

[0023] In the diagram: 111-First bellows, 222-Second bellows, 1-Lower sealing body, 2-Upper sealing body, 3-Air pump, 4-First conduit, 5-First airbag, 6-Limiting shell, 7-Second airbag, 8-Glue box, 9-Glue injection tube, 10-Electric push rod, 11-Piston, 12-Glue guide tube, 13-Guide ring, 14-Glue blocking ring, 15-Exhaust pipe, 16-Second conduit, 17-Connecting rod, 18-Fixing bracket, 19-Sealing sheet, 101-First limiting groove, 201-Second limiting groove, 1301-Airflow channel, 1401-Glue groove, 1402-Air hole, 1403-Heat shrinkable part, 1601-Heating sleeve. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0025] First embodiment: A bellows mechanical seal device for petrochemical applications, according to... Figures 1-11As shown, it includes a lower sealing body 1 and an upper sealing body 2; the lower sealing body 1 is hinged to the upper sealing body 2; the lower sealing body 1 has two symmetrically distributed first limiting grooves 101; the upper sealing body 2 has two symmetrically distributed second limiting grooves 201; each second limiting groove 201 forms a complete circular hole with an adjacent first limiting groove 101; the lower sealing body 1 is equipped with a rotary switch. It also includes an air pump 3, a first conduit 4, a first airbag 5, a limiting unit, an injection unit, a guide ring 13, an adhesive blocking ring 14, and an exhaust pipe 15; the lower sealing body 1 is equipped with the air pump 3; the air pump 3 is connected to the first conduit 4; the lower sealing body 1 is equipped with two symmetrically distributed first airbags 5; the upper sealing body 2 is equipped with two other symmetrically distributed first airbags 5; each first airbag 5 on the lower sealing body 1 corresponds to one first airbag 5 on the upper sealing body 2; the lower sealing body 1 and the upper sealing body 2 are each connected to two symmetrically distributed limiting units, and the first conduit 4 is connected to all the limiting units; the lower sealing body 1 is connected to the injection unit; the injection unit is connected to the guide ring 13; an adhesive blocking ring 14 is fixed to each side of the guide ring 13; the guide ring 13 and the adhesive blocking rings 14 on both sides form an adhesive groove 1401; the upper part of the adhesive groove 1401 is connected to the exhaust pipe 15.

[0026] The working steps of the above embodiments are as follows: First, turn on the knob switch on the lower sealing body 1, then flip the upper sealing body 2 upwards. Next, place the first bellows 111 and the second bellows 222 on the lower sealing body 1, as follows. Figure 4 At this point, observe the size of the gap between the first corrugated pipe 111 and the second corrugated pipe 222. If the gap is greater than 1 cm, close the upper sealing body 2, then cut along the edge of the protruding part of the corrugated pipe exposed to the outside, then open the upper sealing body 2, remove the cut-off material from the lower sealing body 1, then put the first corrugated pipe 111 and the second corrugated pipe 222 back into the lower sealing body 1, and bring the openings of the first corrugated pipe 111 and the second corrugated pipe 222 close to each other, then close the upper sealing body 2 and turn off the knob switch on the lower sealing body 1, so that the lower sealing body 1 and the upper sealing body 2 are firmly connected together.

[0027] Then, the air pump 3 is activated. Air pump 3 penetrates the lower sealing body 1, allowing it to connect the inside and outside of the lower sealing body 1. Air pump 3 extracts air from the lower sealing body 1 and delivers it to the first airbag 5 and the limiting unit through the first conduit 4. The limiting unit simultaneously positions the first bellows 111 and the second bellows 222, ensuring the openings of the first bellows 111 and the second bellows 222 are completely aligned. Then, the first airbag 5 inflates, as... Figure 7As shown, one side of the first airbag 5 is in contact with the inner wall of the lower sealing body 1 or the upper sealing body 2. Therefore, when the first airbag 5 expands, it can only expand to the side. As a result, when the first airbag 5 expands, it squeezes the raised part of the adjacent bellows, causing the first bellows 111 and the second bellows 222 to elongate, and the first bellows 111 and the second bellows port to come into close contact.

[0028] This process only involves pressing the openings of the first bellows 111 and the second bellows 222 together. However, when conveying high-pressure fluid, there is still a risk of fluid leakage between the first bellows 111 and the second bellows 222. Before placing the first bellows 111 and the second bellows 222 into the lower sealing body 1, a sealing structure consisting of a guide ring 13 and two adhesive-resistant rings 14 is placed into the lower sealing body 1, and the adhesive groove 1401 is connected to the adhesive injection unit. Then, the first bellows 111 and the second bellows 222 are placed into the lower sealing body 1, with the openings of the first bellows 111 and the second bellows 222 pre-placed within the area covered by the adhesive groove 1401. The openings of the first bellows 111 and the second bellows 222 are then aligned to ensure tight contact. The adhesive injection unit then injects sealant into the adhesive groove 1401, filling it from bottom to top. Air within the adhesive groove 1401 is discharged through the exhaust pipe 15.

[0029] Based on the above working steps, we can see that the present invention has the following effects: By securing and fixing the first corrugated pipe 111 and the second corrugated pipe 222, and then cutting the first corrugated pipe 111 and the second corrugated pipe 222, it is possible to avoid unevenness at some ends of the first corrugated pipe 111 and the second corrugated pipe 222 within the lower sealing body 1, which would cause gaps between the first corrugated pipe 111 and the second corrugated pipe 222 and affect the transmission of materials within the first corrugated pipe 111 and the second corrugated pipe 222.

[0030] The expansion of the first airbag 5 compresses the raised portion of the adjacent bellows. Due to the elasticity of the bellows, the two ends of the first bellows 111 and the second bellows 222, which are aligned by the limiting unit, come into close contact, achieving a preliminary seal on the bellows ports. This effectively prevents leakage during material transmission and improves the reliability of the seal.

[0031] By pre-placing the openings of the first corrugated pipe 111 and the second corrugated pipe 222 within the area covered by the adhesive tank 1401, the sealant will be precisely coated on the outside of the tightly contacting ports. After the sealant solidifies, the first corrugated pipe 111 and the second corrugated pipe 222 can be firmly connected together without leakage.

[0032] The limiting unit includes a limiting shell 6 and a second airbag 7; two symmetrically distributed limiting shells 6 are fixedly connected to the lower sealing body 1 and the upper sealing body 2; a second airbag 7 is installed in each limiting shell 6; each limiting shell 6 on the lower sealing body 1 corresponds to one limiting shell 6 on the upper sealing body 2; each second airbag 7 on the lower sealing body 1 and one second airbag 7 on the upper sealing body 2 form a complete ring.

[0033] The glue dispensing unit includes a glue box 8, a glue dispensing tube 9, an electric push rod 10, a piston 11, and a glue guide tube 12; the glue box 8 is installed inside the lower sealing body 1; the glue box 8 is connected to the glue dispensing tube 9 at the top; the electric push rod 10 is installed inside the glue box 8; the piston 11 is fixedly connected to the telescopic part of the electric push rod 10; the piston 11 is slidably connected to the glue box 8; the glue box 8 is connected to the glue guide tube 12; the glue guide tube 12 is connected to the glue tank 1401; the glue guide tube 12 is detachably connected to the guide ring 13.

[0034] The piston 11 has a C-shaped groove that mates with the glue guide tube 12 and the glue injection tube 9.

[0035] Both the first limiting groove 101 and the second limiting groove 201 are provided with sponge strips.

[0036] A solenoid valve is installed on the first conduit 4.

[0037] A dustproof net is installed at the air inlet of the air pump 3, and the first conduit 4 is connected to the air pump 3 at the air outlet.

[0038] In addition to the above-mentioned technical effects, the present invention also has the following advantages: First, by pumping air into the second airbag 7, which is restricted by the limiting shell 6, the second airbag 7 can only expand in the direction of the first bellows 111 or the second bellows 222, such as... Figure 8 As shown, the synchronously expanding second airbag 7 applies a radial force to the first bellows 111 or the second bellows 222, aligning the ends of the first bellows 111 and the second bellows 222. This achieves flexible automatic alignment of the bellows ends, effectively avoiding the low efficiency and misalignment issues of existing technologies where bellows alignment typically relies on mechanical clamps or manual adjustments. This device, by driving the second airbag 7 to expand, forms an annular pressure on the first bellows 111 and the second bellows 222, dynamically adjusting the position of the bellows ends to ensure precise alignment of the pipe openings. It adapts to bellows of different sizes and improves the efficiency of sealing installation.

[0039] Second, sealant is pre-filled into the glue box 8 through the glue injection tube 9, with the tube opening of the glue injection tube 9 located above the C-shaped groove of the piston 11. The sealant is injected into the glue box 8, and the air in the glue box 8 enters the glue tank 1401 through the glue guide tube 12 and is then discharged through the exhaust pipe 15. After the glue box 8 is full and the alignment and initial sealing of the first corrugated pipe 111 and the second corrugated pipe 222 have been completed, the electric push rod 10 is activated. The electric push rod 10 extends and drives the piston 11 to move synchronously. The piston 11 pushes the sealant in the glue box 8 and enters the glue tank 1401 through the glue guide tube 12. At this time, the sealant fills the glue tank 1401 from bottom to top, ensuring that the sealant is filled tightly and effectively avoiding the presence of air residue in the sealant that affects the sealing effect. In the prior art, glue injection sealing often relies on simple injection, and the sealant is prone to leakage or forming voids.

[0040] Third, the guide tube 12 and guide ring 13 are detachably connected. If it is necessary to move this device to another location for mechanical sealing, the first bellows 111 and the second bellows 222 can be fixed, and then the device can be rotated to disconnect the connection between the guide tube 12 and the guide ring 13. Then the upper sealing body 2 can be opened to move the device away from that location. Then the guide ring 13 and the adhesive blocking ring 14 can be reinstalled on the guide tube 12. Alternatively, guide rings 13 and adhesive blocking rings 14 of other diameters can be selected according to the actual bellows diameter, thus adapting to the switching between bellows of different specifications and expanding the range of applications.

[0041] Fourth, by providing sponge strips on both the first limiting groove 101 and the second limiting groove 201, the adaptive deformation of the sponge strips when the upper sealing body 2 and the lower sealing body 1 are closed can not only adapt to the first bellows 111 and the second bellows 222 of different specifications and limit and fix the first bellows 111 and the second bellows 222, but also increase the friction with the first bellows 111 and the second bellows 222, so as to avoid misalignment between the first bellows 111 and the second bellows 222 when the bellows are transporting fluid, which would lead to fluid leakage. In addition, the sponge strips can enhance the buffering effect and further adapt to the vibration and impact in the petrochemical environment.

[0042] Fifth, by installing a dustproof screen at the air inlet of the air pump 3, the air passing through the dustproof screen is filtered before entering the air pump 3, effectively preventing dust and impurities in the air from entering the second airbags 7 and the first airbags 5 through the air pump 3 and the first conduit 4. Dust and impurities accumulate in the second airbags 7 and the first airbags 5, which is not only difficult to clean, but also reduces the service life of the second airbags 7 and the first airbags 5. Furthermore, the air inlet of the air pump 3 is located inside the lower sealing body 1, so when the glue tank 1401 is filled with glue, the volatiles of the sealant are discharged into the lower sealing body 1 together with the air in the glue tank 1401. The dustproof screen made of activated carbon material can also absorb the volatiles of the sealant when the air is extracted, preventing the volatiles of the sealant from being discharged into the outside world and polluting the external environment.

[0043] Second embodiment: Based on the first embodiment, according to Figures 1-6 , Figure 11 and Figure 12 As shown, it also includes a second conduit 16; the first conduit 4 is connected to the second conduit 16; a solenoid valve is installed on the second conduit 16; a heating sleeve 1601 is provided on the second conduit 16; an airflow channel 1301 is opened in the guide ring 13; the second conduit 16 is connected to the airflow channel 1301; the second conduit 16 and the guide ring 13 are detachably connected; all the adhesive-resistant rings 14 have a number of annularly distributed air holes 1402; heat-shrinkable parts 1403 are provided on the opposite sides of the two adhesive-resistant rings 14; the air holes 1402 on each adhesive-resistant ring 14 face the adjacent heat-shrinkable parts 1403; the airflow channel 1301 is connected to all the air holes 1402.

[0044] It also includes a connecting rod 17, a fixing frame 18, and a sealing plate 19; the fixing frame 18 is slidably connected inside the exhaust pipe 15; a pressure sensor is provided at the lower part of the fixing frame 18; the connecting rod 17 is fixedly connected to the middle part of the fixing frame 18; the sealing plate 19 is fixedly connected to the upper part of the connecting rod 17; the sealing plate 19 is in contact with the exhaust pipe 15.

[0045] The sealing sheet 19 is made of silicone, and the middle part of the sealing sheet 19 is connected to the connecting rod 17.

[0046] The working steps of the above embodiments are as follows: Considering that the guide ring 13 and the adhesive-resistant ring 14 need to adapt to different specifications of the first bellows 111 or the second bellows 222, the solenoid valve on the second conduit 16 is opened. The air in the first conduit 4 enters the airflow channel 1301 through the second conduit 16. At the same time, the heating jacket 1601 is activated to heat the air flowing through the second conduit 16. Then the hot air is obliquely sprayed out through the air hole 1402 to the heat shrink part 1403, causing the heat shrink part 1403 to shrink and tightly connect with the first bellows 111 or the second bellows 222.

[0047] During the glue injection process, the sealant expels the air upwards from the glue tank 1401. After the air is squeezed into the exhaust pipe 15, it is compressed, and the compressed air pushes up one side of the silicone sealing sheet 19, causing the sealing sheet 19 to deform. A gap appears between the sealing sheet 19 and the exhaust pipe 15, and the compressed air is discharged from the gap. After the air in the glue tank 1401 is completely expelled, the sealant enters the exhaust pipe 15 and contacts the fixing frame 18. After the pressure sensor on the fixing frame 18 detects that the sealant has entered the exhaust pipe 15, it controls the glue injection unit to shut down and then shuts down the heating function of the heating jacket 1601. Hot air flows in the airflow channel 1301 and then blows out through the air hole 1402. The inclined air hole 1402 guides the hot air to the heat shrink section 1403 to purify the surrounding area. The heat shrink section 1403 shrinks after being heated, making the heat shrink section 1403 in close contact with the first corrugated pipe 111 or the second corrugated pipe 222.

[0048] Based on the above working steps, we can see that the present invention has the following effects: First, by uniformly heating the heat-shrinkable part 1403, it shrinks and adheres tightly to the first corrugated pipe 111 or the second corrugated pipe 222. Addressing the high temperature, corrosion, and vibration characteristics of the petrochemical environment, the addition of the heat-shrinkable part 1403 improves the durability and safety of the device. This also enables sealed connections between the first corrugated pipe 111 or the second corrugated pipe 222 of different specifications, further sealing the glue tank 1401 and effectively preventing sealant leakage during the glue injection process. Furthermore, the air vent 1402 not only blows hot air for heat shrinking the heat-shrinkable part 1403 but also cleans the area near the sealing zone.

[0049] Secondly, due to the detachable connection between the second conduit 16 and the guide ring 13, if it is necessary to move this device to another location for mechanical sealing, the first bellows 111 and the second bellows 222 can be fixed, and then the device can be rotated to disconnect the connection between the second conduit 16 and the guide ring 13. Then, the upper sealing body 2 can be opened to move the device away from that location. Then, the guide ring 13 and the adhesive-resistant ring 14 can be reinstalled on the second conduit 16. Alternatively, other diameter guide rings 13 and adhesive-resistant rings 14 can be selected according to the actual diameter of the bellows, thereby adapting to the switching between bellows of different specifications and expanding the range of applications.

[0050] Third, by pumping air into the airflow channel 1301, the flowing air cools the sealant in the glue tank 1401, allowing the sealant to cure quickly, making the bellows sealing more efficient and giving the device greater practical value in industrial applications.

[0051] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A bellows mechanical seal device for petrochemical applications, comprising a lower sealing body (1) and an upper sealing body (2); the lower sealing body (1) is movably connected to the upper sealing body (2); the lower sealing body (1) has two first limiting grooves (101); the upper sealing body (2) has two second limiting grooves (201); each second limiting groove (201) forms a complete circular hole with an adjacent first limiting groove (101); characterized in that: It also includes an air pump (3), a first conduit (4), a first airbag (5), a limiting unit, an injection unit, a guide ring (13), a sealing ring (14), and an exhaust pipe (15); the lower sealing body (1) is equipped with an air pump (3); the air pump (3) is connected to the first conduit (4); the lower sealing body (1) is equipped with two first airbags (5); the upper sealing body (2) is equipped with two other first airbags (5); each first airbag (5) on the lower sealing body (1) corresponds to one first airbag (5) on the upper sealing body (2); the lower sealing body (1) and the upper sealing body ( 2) Each connection has two limiting units, and the first conduit (4) is connected to all the limiting units; the limiting units are used to align the openings of the first corrugated pipe (111) and the second corrugated pipe (222); the lower sealing body (1) is connected to the glue injection unit; the glue injection unit is connected to the guide ring (13); a glue blocking ring (14) is fixed on each side of the guide ring (13); the guide ring (13) and the glue blocking rings (14) on both sides form a glue groove (1401); the glue injection unit is used to inject sealant into the glue groove (1401); the glue groove (1401) is connected to the exhaust pipe (15).

2. A bellows mechanical seal device for petrochemical applications according to claim 1, characterized in that: The limiting unit includes a limiting shell (6) and a second airbag (7); two limiting shells (6) are fixedly connected to the lower sealing body (1) and the upper sealing body (2); a second airbag (7) is installed in each limiting shell (6); each limiting shell (6) on the lower sealing body (1) corresponds to one limiting shell (6) on the upper sealing body (2); each second airbag (7) on the lower sealing body (1) and one second airbag (7) on the upper sealing body (2) form a complete ring.

3. A bellows mechanical seal device for petrochemical applications according to claim 1, characterized in that: The glue dispensing unit includes a glue box (8), a glue dispensing tube (9), an electric push rod (10), a piston (11), and a glue guide tube (12); the glue box (8) is installed inside the lower sealing body (1); the glue box (8) is connected to the glue dispensing tube (9); the electric push rod (10) is installed inside the glue box (8); the piston (11) is fixedly connected to the telescopic part of the electric push rod (10); the piston (11) is slidably connected to the glue box (8); the glue box (8) is connected to the glue guide tube (12); the glue guide tube (12) is connected to the glue tank (1401); the glue guide tube (12) is detachably connected to the guide ring (13).

4. A bellows mechanical seal device for petrochemical applications according to claim 3, characterized in that: The piston (11) has a C-shaped groove that fits with the glue guide tube (12) and the glue injection tube (9).

5. A bellows mechanical seal device for petrochemical applications according to claim 1, characterized in that: Both the first limiting groove (101) and the second limiting groove (201) are provided with sponge strips.

6. A bellows mechanical seal device for petrochemical applications according to claim 1, characterized in that: A solenoid valve is installed on the first conduit (4).

7. A bellows mechanical seal device for petrochemical applications according to claim 1, characterized in that: A dustproof net is provided at the air inlet of the air pump (3), and the first conduit (4) is connected to the air pump (3) at the air outlet.

8. A bellows mechanical seal device for petrochemical applications according to claim 7, characterized in that: It also includes a second conduit (16); the first conduit (4) is connected to the second conduit (16); a solenoid valve is installed on the second conduit (16); a heating sleeve (1601) is provided on the second conduit (16); an airflow channel (1301) is opened in the guide ring (13); the second conduit (16) is connected to the airflow channel (1301); the second conduit (16) and the guide ring (13) are detachably connected; all the adhesive rings (14) have several air holes (1402); the two adhesive rings (14) have heat shrinkable parts (1403) on opposite sides; the air holes (1402) on each adhesive ring (14) face the adjacent heat shrinkable parts (1403); the airflow channel (1301) is connected to all the air holes (1402).

9. A bellows mechanical seal device for petrochemical applications according to any one of claims 1-8, characterized in that: It also includes a connecting rod (17), a fixing frame (18) and a sealing plate (19); the fixing frame (18) is slidably connected inside the exhaust pipe (15); a pressure sensor is provided at the lower part of the fixing frame (18); the connecting rod (17) is fixedly connected to the fixing frame (18); the sealing plate (19) is fixedly connected to the upper part of the connecting rod (17); the sealing plate (19) is in contact with the exhaust pipe (15).

10. A bellows mechanical seal device for petrochemical applications according to claim 9, characterized in that: The sealing sheet (19) is made of silicone, and the middle part of the sealing sheet (19) is connected to the connecting rod (17).

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