Mechanical seal assembly for preventing cold leakage of cold storage wall pipe

Abstract

The present application relates to the technical field of cold storage sealing, in particular to a cold storage wall-penetrating pipeline cold-leakage-preventing mechanical sealing assembly, which comprises a pipeline sealing piece, the pipeline sealing piece comprises a sleeve and a sealing plate, the sleeve is provided with a sealing mechanism, and the sealing mechanism comprises a mounting assembly and a positioning assembly. The cold storage wall-penetrating pipeline cold-leakage-preventing mechanical sealing assembly comprises a plurality of positioning shafts and an integrated rubber strip sealing structure arranged in a ring shape outside the sleeve. The positioning shafts drive the flexible rubber strip to tightly adhere to and compress the inner wall of the pipeline. The rubber strip has good deformation adaptability and can adhere to the fine concave-convex surface of the inner wall of the pipeline, fully fills the annular gap between the sleeve and the inner wall of the pipeline, forms a continuous and airtight radial sealing layer, and improves the sealing performance of the inner wall of the pipeline.

Description

Technical Field

[0001] This invention relates to the field of cold storage sealing technology, specifically to a mechanical seal assembly for preventing cold leakage from wall-penetrating pipes in cold storage. Background Technology

[0002] Cold storage facilities, as core infrastructure in the cold chain logistics system, are specifically designed for the long-term low-temperature storage of various frozen goods (such as meat, aquatic products, frozen foods, pharmaceutical preparations, and fine chemical raw materials). Their operating principle is based on the continuous operation of refrigeration units, combined with a highly efficient insulated storage structure, to maintain the internal temperature stably within a preset freezing range (usually -18℃ to -25℃, and for some special goods, below -40℃). This effectively inhibits microbial growth, slows down enzymatic reactions and oxidative deterioration processes, and preserves the original quality, taste, and nutritional value of the goods to the greatest extent possible, enabling large-volume frozen goods to be safely stored and preserved for extended periods across seasons and regions.

[0003] However, existing cold storage units are equipped with multiple heat exchange and ventilation pipes. These pipes need to penetrate the walls and ceiling of the cold storage unit for assembly. The pipes are simply butted together at the openings in the cold storage unit, without any dedicated sealing or protective structure. There are generally gaps of varying sizes at the pipe joints and where the pipes meet the openings in the cold storage unit. This creates a pressure difference between the inside of the cold storage and the outside environment, causing the low-temperature cold air inside to continuously leak out through these gaps, resulting in cold air leakage. Simultaneously, warm, humid air from the outside environment can also seep back into the cold storage unit through these gaps. When the hot and humid air seeps in and cools down, it easily condenses, frosts, or even freezes around the gaps and on the outer walls of the pipes. Long-term cold leakage will cause a significant loss of cold storage capacity, requiring the compressor unit to be started frequently to replenish the cooling, increasing the energy consumption of the equipment and raising the operating costs of the cold storage. On the other hand, the frost and ice will gradually erode the insulation layer of the cold storage and the pipe joints, accelerating the aging and damage of the sealing parts, further widening the gaps, forming a vicious cycle of cold leakage-ice formation-gap widening. In severe cases, it can also damage the insulation structure of the cold storage, affecting the overall insulation performance of the cold storage and hindering the stable storage of goods inside. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a cold storage through-wall pipe anti-cold leakage mechanical seal component to solve the problem that the pipe is not equipped with a special sealing and protection structure, there are gaps at the pipe joints, and the cold air inside the cold storage will continuously leak out along the gaps, resulting in cold air leakage.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A mechanical seal assembly for preventing cold leakage in a cold storage through-wall pipe includes a pipe seal, which comprises a sleeve and a sealing plate. The sleeve and the sealing plate are combined to form a sealing structure to seal the cold storage pipe opening. The sleeve is provided with a sealing mechanism, which includes an installation component and a positioning component. The installation component, in conjunction with the positioning component, enables the pipe seal to be installed inside the cold storage pipe for sealing.

[0007] Preferably, the installation assembly includes a first drive shaft disposed in the middle of the sealing plate. The first drive shaft is rotatably connected to the inner wall of the sleeve at one end. The surface of the first drive shaft is provided with a coaxial annular block. The surface of the sleeve has a positioning shaft. The sleeve has multiple through holes adapted to the positioning shaft. The positioning shaft is slidably connected inside the corresponding through hole. The outer wall of one end of the multiple positioning shafts extending out of the through hole is fixed with the same rubber strip.

[0008] Preferably, the outer wall of the positioning shaft is fixed with an annular disk, and the sleeve is provided with multiple annular grooves. The multiple annular grooves correspond one-to-one with the through holes and are connected. The annular disk is slidably connected inside the corresponding annular groove, and a second return spring is fixed between one side of the annular disk and the inner wall of the annular groove.

[0009] Preferably, the positioning component includes a plurality of abutment blocks arranged in a ring on one side of the sleeve. A plurality of grooves are provided on the side of the sleeve away from the sealing plate. The sidewalls of the abutment blocks are slidably connected to the inner walls of the corresponding grooves. Side blocks are fixed on both sides of the abutment blocks. Receiving grooves are provided on both sides of the groove walls. The sidewalls of the side blocks are slidably connected to the groove walls of the receiving grooves. A second return spring is fixed between the end of the side block away from the axial direction of the first drive shaft and the sidewall of the side block.

[0010] Preferably, a second drive shaft is provided inside the groove, an arc-shaped block is fixed to the outer wall of the second drive shaft, and a push block is fixed to the side of the abutment block facing the axis of the first drive shaft.

[0011] Preferably, the sleeve has a plurality of first limiting holes adapted to the second drive shaft, the outer wall of the second drive shaft is rotatably connected to the inner wall of the corresponding first limiting hole, and the annular block has a plurality of second limiting holes arranged in a ring and adapted to the second drive shaft, and the second drive shaft is slidably connected inside the corresponding second limiting hole.

[0012] Preferably, the inner wall of the second limiting hole is fixed with a protrusion, and the outer wall of one end of the second drive shaft is provided with a linkage groove for the protrusion to slide, and the protrusion is slidably connected inside the corresponding linkage groove.

[0013] Preferably, the adsorption assembly includes multiple suction cups arranged in a ring on one side of the sealing plate. The sealing plate has multiple trapezoidal holes adapted to the suction cups on the side facing the sleeve. The outer wall of the suction cup is attached to the wall of the trapezoidal hole. A piston is installed inside the suction cup. Multiple sliding holes are opened on the side of the sealing plate away from the sleeve. The multiple sliding holes correspond one-to-one with the trapezoidal holes and are connected. The piston is slidably connected inside the corresponding sliding hole.

[0014] Preferably, the piston is provided with a side bracket on the outside, and a slide rail is provided on the side bracket. A side shaft is fixed to the outer wall of one end of the piston extending out of the slide hole. The side shaft is slidably connected to the inside of the slide rail. A plurality of third limiting holes adapted to the first drive shaft are opened on the side of the sealing plate away from the sleeve, and the outer wall of the first drive shaft is rotatably connected to the hole wall of the corresponding third limiting hole.

[0015] Preferably, a disc is fixed to the outer wall of the third drive shaft, a slide rail is provided on one side of the disc, the third drive shaft is fixed to one side of the side frame, and the third drive shaft is slidably connected inside the slide rail.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. By arranging multiple sets of positioning shafts and an integrated rubber strip sealing structure in a ring on the outside of the sleeve, the positioning shafts drive the flexible rubber strip to tightly fit and press against the inner wall of the pipe. The rubber strip has good deformation adaptability and can fit the fine concave and convex surfaces of the inner wall of the pipe, fully filling the annular gap between the sleeve and the inner wall of the pipe, forming a continuous and sealed radial sealing layer to improve the sealing performance of the inner wall of the pipe.

[0018] 2. During the operation of the first drive shaft, the axial linear motion of the ring block is converted into the rotational motion of the second drive shaft by relying on the cooperation of the spiral linkage groove and the protrusion. Through the transmission cooperation of the arc block and the push block, multiple sets of abutment blocks are driven to extend outward synchronously and abut tightly against the wall sidewall of the through-wall pipe opening, forming an axial positioning support structure. This can effectively offset the effects of cold storage temperature difference deformation and pipe ventilation vibration, and avoid problems such as displacement, loosening, and offset of the sealing components during long-term use.

[0019] 3. Through the linkage of the second drive shaft with the disc, the third drive shaft and the side frame structure, the piston is driven to slide outward along the sliding hole, drawing air from the inside of the suction cup to form a negative pressure vacuum environment, so that the suction cup is adsorbed and attached to the surface of the cold storage wall, and the sealing plate is tightly attached to the end face of the wall, improving the overall sealing performance of the cold storage through-wall pipe opening, minimizing cold loss, and reducing the refrigeration energy consumption of the cold storage. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2This is a schematic diagram of the sealing mechanism of the present invention;

[0022] Figure 3 This is a schematic diagram of the adsorption component of the present invention;

[0023] Figure 4 This is a schematic diagram of the installation component of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the annular block of the present invention;

[0025] Figure 6 This is a schematic diagram of the side block structure of the present invention.

[0026] In the picture:

[0027] 10. Pipe seals; 101. Sleeves; 102. Sealing plates;

[0028] 20. Sealing mechanism;

[0029] 21. Mounting components; 2101. First drive shaft; 2104. Annular block; 2105. Positioning shaft; 2106. Through hole; 2107. Annular disc; 2108. Annular groove; 2204. Second return spring; 2110. Rubber strip;

[0030] 22. Positioning component; 2201. Abutment block; 2202. Groove; 2203. Side block; 2204. Second return spring; 2205. Receiving groove; 2206. Second drive shaft; 2207. Arc-shaped block; 2208. Push block; 2209. First limiting hole; 2210. Second limiting hole; 2211. Protrusion; 2212. Linkage groove;

[0031] 30. Adsorption assembly; 31. Suction cup; 32. Trapezoidal hole; 33. Piston; 34. Sliding hole; 35. Side frame; 36. Slide rail; 37. Side shaft; 38. Disc; 39. Third drive shaft; 310. Third limiting hole; 311. Slide track. Detailed Implementation

[0032] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0033] As attached Figures 1-6 As shown, a cold storage through-wall pipe anti-cold leakage mechanical seal assembly includes a pipe seal 10 for sealing the cold storage pipe opening. The pipe seal 10 includes a coaxial sleeve 101 and a sealing plate 102. The diameter of the sealing plate 102 is larger than the diameter of the sleeve 101, and the sleeve 101 and the sealing plate 102 together form a sealing structure.

[0034] A sealing mechanism 20 is provided on the sleeve 101 to make the pipe seal 10 fit tightly against the cold storage pipe opening, so as to improve the sealing performance of the cold storage pipe opening.

[0035] The sealing mechanism 20 includes an installation component 21 and a positioning component 22. The installation component 21, in conjunction with the positioning component 22, enables the pipe seal 10 to be installed inside the cold storage pipe for sealing.

[0036] The mounting assembly 21 includes a first drive shaft 2101 disposed in the middle of the sealing plate 102. The first drive shaft 2101 is coaxially disposed with the sealing plate 102. One end of the first drive shaft 2101 is rotatably connected to the inner wall of the sleeve 101. A coaxial annular block 2104 is disposed on the surface of the first drive shaft 2101. The annular block 2104 has an annular cavity inside for accommodating the pipe.

[0037] The sleeve 101 has multiple positioning shafts 2105 on its surface, which are arranged in a ring on the surface of the sleeve 101. The sleeve 101 has multiple through holes 2106 that are adapted to the positioning shafts 2105. The multiple through holes 2106 correspond one-to-one with the positioning shafts 2105, and the positioning shafts 2105 are slidably connected inside the corresponding through holes 2106. The same rubber strip 2110 is fixed to the outer wall of one end of the multiple positioning shafts 2105 extending out of the through holes 2106. The positioning shafts 2105, in conjunction with the through holes 2106, enable the rubber strip 2110 to abut against the groove wall of the cold storage pipe, thereby sealing the cold storage pipe.

[0038] An annular disk 2107 is fixed to the outer wall of the positioning shaft 2105. Multiple annular grooves 2108 are provided on the sleeve 101. The multiple annular grooves 2108 correspond one-to-one with the through holes 2106 and are connected. The annular disk 2107 is slidably connected inside the corresponding annular groove 2108. A second return spring 2204 is fixed between one side of the annular disk 2107 and the inner wall of the annular groove 2108 to support the annular disk 2107 so as to drive the released annular disk 2107 to return to its original position.

[0039] The positioning component 22 includes multiple abutment blocks 2201 arranged in a ring on one side of the sleeve 101. Multiple grooves 2202 are provided on the side of the sleeve 101 away from the sealing plate 102. The multiple grooves 2202 are arranged in a ring on one side of the sleeve 101. The side wall of the abutment block 2201 is slidably connected to the inner wall of the corresponding groove 2202. When the abutment block 2201 slides out of the groove 2202, the side wall of the abutment block 2201 can abut against the wall of the pipe opening, thereby positioning the pipe seal 10.

[0040] Side blocks 2203 are fixed on both sides of the abutment block 2201. Receiving grooves 2205 are provided on both sides of the groove wall of the groove 2202. The side wall of the side block 2203 is slidably connected to the groove wall of the receiving groove 2205. The side block 2203 cooperates with the receiving groove 2205 to limit the abutment block 2201.

[0041] A second return spring 2204 is fixed between the end of the side block 2203 away from the axial direction of the first drive shaft 2101 and the side wall of the side block 2203, which is used to support the side block 2203 so as to drive the side block 2203 to return to its original position after the restriction is lifted.

[0042] A second drive shaft 2206 is provided inside the groove 2202. An arc-shaped block 2207 is fixed to the outer wall of the second drive shaft 2206. A push block 2208 is fixed to the side of the abutment block 2201 facing the axis of the first drive shaft 2101. When the second drive shaft 2206 rotates, the arc-shaped block 2207 can drive the abutment block 2201 connected to it to slide to the outside of the groove 2202 through the push block 2208.

[0043] The sleeve 101 has multiple first limiting holes 2209 adapted to the second drive shaft 2206. The first limiting holes 2209 correspond one-to-one with the grooves 2202, and the first limiting holes 2209 are connected to the corresponding grooves 2202. That is, the outer wall of the second drive shaft 2206 is rotatably connected to the inner wall of the corresponding first limiting hole 2209. The annular block 2104 has multiple second limiting holes 2210 arranged in a ring and adapted to the second drive shaft 2206. The second limiting holes 2210 correspond one-to-one with the first limiting holes 2209, and the first limiting holes 2209 and the corresponding second limiting holes 2210 are coaxial. The second drive shaft 2206 is slidably connected inside the corresponding second limiting hole 2210. The first limiting holes 2209 limit the connected second drive shaft 2206 through the second limiting holes 2210.

[0044] The inner wall of the second limiting hole 2210 is fixed with a protrusion 2211. One end of the outer wall of the second drive shaft 2206 is provided with a linkage groove 2212 for the sliding of the protrusion 2211. The protrusion 2211 is slidably connected to the inside of the corresponding linkage groove 2212. The linkage groove 2212 is spiral. When the protrusion 2211 slides along the extension trajectory of the linkage groove 2212, the first drive shaft 2101 can rotate, thereby driving the abutment block 2201 to slide inside the groove 2202.

[0045] The adsorption assembly 30 includes a plurality of suction cups 31 arranged in a ring on one side of the sealing plate 102. The sealing plate 102 has a plurality of trapezoidal holes 32 that are adapted to the suction cups 31 on the side facing the sleeve 101. The plurality of trapezoidal holes 32 correspond one-to-one with the suction cups 31, and the outer wall of the suction cup 31 is attached to the hole wall of the trapezoidal hole 32. The suction cup 31 can adsorb the sealing plate 102 onto the wall to improve the sealing performance of the pipe seal 10 for the cold storage pipe.

[0046] The suction cup 31 is equipped with a piston 33. The sealing plate 102 has multiple sliding holes 34 on the side away from the sleeve 101. The multiple sliding holes 34 correspond one-to-one with the trapezoidal holes 32 and are connected. The piston 33 is slidably connected inside the corresponding sliding hole 34. When the piston 33 slides to the outside of the sliding hole 34, it can make the inner wall of the suction cup 31 be in a negative pressure state.

[0047] The piston 33 is provided with a side bracket 35 on the outside, and a slide rail 36 is provided on the side bracket 35. A side shaft 37 is fixed to the outer wall of one end of the piston 33 extending out of the slide hole 34. The side shaft 37 is slidably connected to the inside of the slide rail 36. When the side shaft 37 slides along the extension trajectory of the slide rail 36, it can drive the piston 33 to slide inside the slide hole 34.

[0048] The sealing plate 102 has multiple third limiting holes 310 that are adapted to the first drive shaft 2101 on the side away from the sleeve 101. The outer wall of the first drive shaft 2101 is rotatably connected to the hole wall of the corresponding third limiting hole 310. The outer wall of the third drive shaft 39 is fixed with a disc 38. A slide 311 is provided on one side of the disc 38. The side frame 35 is fixed with the third drive shaft 39 on one side. The third drive shaft 39 is slidably connected inside the slide 311.

[0049] Working principle: In use, the pipe seal 10 is sleeved on the surface of the pipe. When the pipe seal 10 is installed inside the cold storage pipe opening, the sleeve 101 and the sealing plate 102 abut against the wall of the pipe opening. At this time, the rubber strip 2110 is squeezed by the inner wall of the pipe opening. The rubber strip 2110 drives the positioning shaft 2105 to slide into the inside of the sleeve 101. At the same time, the annular disc 2107 slides inside the annular groove 2108 and stretches the second return spring 2204. Since the side of the sleeve 101 facing the sleeve 101 has an inclined surface, and the end of the positioning shaft 2105 extending to the inner wall of the sleeve 101 has a spherical end, the spherical end of the bottom of the positioning shaft 2105 will slide from the top of the inclined surface of the annular block 2104 to its bottom, thereby driving the annular block 2104 to slide towards the sealing plate 102.

[0050] When the annular block 2104 slides toward the sealing plate 102, the protrusion 2211 can slide along the extension trajectory of the linkage groove 2212. The protrusion 2211 drives the second drive shaft 2206 to rotate inside the first limiting hole 2209 and the second limiting hole 2210. The second drive shaft 2206 drives the abutment block 2201 to slide toward the edge of the sleeve 101 through the arc block 2207 and the push block 2208. At the same time, the side block 2203 compresses the second return spring 2204. After the abutment block 2201 slides to the outside of the groove 2202, the abutment block 2201 can abut against the wall of the cold storage pipe at the sleeve 101 to position the sleeve 101.

[0051] As the second drive shaft 2206 rotates, it drives the disk 38 to rotate. The third drive shaft 39 slides along the extension trajectory of the slide rail 311. When the third drive shaft 39 slides to the peak and valley of the slide rail 311, it drives the connected side bracket 35 to slide towards the axis of the sleeve 101. The side shaft 37 slides along the extension trajectory of the slide rail 36. That is, the side shaft 37 drives the piston 33 to slide to the outside of the slide hole 34. The piston 33 draws the gas inside the suction cup 31, creating a negative pressure inside the suction cup 31, thereby improving the stability of the pipe seal 10 and improving the sealing performance of the pipe seal 10.

[0052] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A mechanical seal assembly for preventing cold leakage from a through-wall pipe in a cold storage facility, comprising a pipe seal (10), wherein the pipe seal (10) includes a sleeve (101) and a sealing plate (102), the sleeve (101) and the sealing plate (102) together forming a sealing structure to seal the cold storage pipe opening, characterized in that: The sleeve (101) is provided with a sealing mechanism (20), which includes an installation component (21) and a positioning component (22). The installation component (21) and the positioning component (22) enable the pipe seal (10) to be installed inside the cold storage pipe for sealing.

2. The cold storage through-wall pipe anti-cold leakage mechanical seal assembly according to claim 1, characterized in that, The mounting assembly (21) includes a first drive shaft (2101) located in the middle of the sealing plate (102). The first drive shaft (2101) is rotatably connected to the inner wall of the sleeve (101) at one end. The surface of the first drive shaft (2101) is provided with a coaxial annular block (2104). The surface of the sleeve (101) has a positioning shaft (2105). The sleeve (101) has multiple through holes (2106) adapted to the positioning shaft (2105). The positioning shaft (2105) is slidably connected to the interior of the corresponding through hole (2106). The outer wall of the end of the multiple positioning shafts (2105) extending out of the through hole (2106) is fixed with the same rubber strip (2110).

3. The cold storage through-wall pipe anti-cold leakage mechanical seal assembly according to claim 2, characterized in that, The outer wall of the positioning shaft (2105) is fixed with an annular disk (2107), and the sleeve (101) is provided with multiple annular grooves (2108). The multiple annular grooves (2108) correspond one-to-one with the through holes (2106) and are connected. The annular disk (2107) is slidably connected inside the corresponding annular groove (2108). A second return spring (2204) is fixed between one side of the annular disk (2107) and the inner wall of the annular groove (2108).

4. The cold storage through-wall pipe anti-cold leakage mechanical seal assembly according to claim 3, characterized in that, The positioning component (22) includes multiple abutment blocks (2201) arranged in a ring on one side of the sleeve (101). Multiple grooves (2202) are provided on the side of the sleeve (101) away from the sealing plate (102). The side wall of the abutment block (2201) is slidably connected to the inner wall of the corresponding groove (2202). Side blocks (2203) are fixed on both sides of the abutment block (2201). Receiving grooves (2205) are provided on both sides of the groove (2202). The side wall of the side block (2203) is slidably connected to the groove wall of the receiving groove (2205). A second return spring (2204) is fixed between the end of the side block (2203) away from the axial direction of the first drive shaft (2101) and the side wall of the side block (2203).

5. The cold storage through-wall pipe anti-cold leakage mechanical seal assembly according to claim 4, characterized in that, The groove (2202) is provided with a second drive shaft (2206), and an arc-shaped block (2207) is fixed on the outer wall of the second drive shaft (2206). A push block (2208) is fixed on the side of the abutment block (2201) facing the axis of the first drive shaft (2101).

6. The cold storage through-wall pipe anti-cold leakage mechanical seal assembly according to claim 5, characterized in that, The sleeve (101) has a plurality of first limiting holes (2209) adapted to the second drive shaft (2206). The outer wall of the second drive shaft (2206) is rotatably connected to the inner wall of the corresponding first limiting hole (2209). The annular block (2104) has a plurality of second limiting holes (2210) arranged in a ring and adapted to the second drive shaft (2206). The second drive shaft (2206) is slidably connected to the inside of the corresponding second limiting hole (2210).

7. The cold storage through-wall pipe anti-cold leakage mechanical seal assembly according to claim 6, characterized in that, The inner wall of the second limiting hole (2210) is fixed with a protrusion (2211), and the outer wall of one end of the second drive shaft (2206) is provided with a linkage groove (2212) for sliding of the protrusion (2211). The protrusion (2211) is slidably connected inside the corresponding linkage groove (2212).

8. The cold storage through-wall pipe anti-cold leakage mechanical seal assembly according to claim 7, characterized in that, The adsorption assembly (30) includes multiple suction cups (31) arranged in a ring on one side of the sealing plate (102). The sealing plate (102) facing the sleeve (101) has multiple trapezoidal holes (32) that are adapted to the suction cups (31). The outer wall of the suction cup (31) is attached to the hole wall of the trapezoidal hole (32). A piston (33) is installed inside the suction cup (31). Multiple sliding holes (34) are opened on the side of the sealing plate (102) away from the sleeve (101). The multiple sliding holes (34) correspond one-to-one with the trapezoidal holes (32) and are connected. The piston (33) is slidably connected inside the corresponding sliding hole (34).

9. The cold storage through-wall pipe anti-cold leakage mechanical seal assembly according to claim 8, characterized in that, The piston (33) is provided with a side frame (35) on the outside, and a slide rail (36) is provided on the side frame (35). A side shaft (37) is fixed on the outer wall of one end of the piston (33) extending out of the slide hole (34). The side shaft (37) is slidably connected to the inside of the slide rail (36). A plurality of third limiting holes (310) adapted to the first drive shaft (2101) are opened on the side of the sealing plate (102) away from the sleeve (101). The outer wall of the first drive shaft (2101) is rotatably connected to the hole wall of the corresponding third limiting hole (310).

10. The cold storage through-wall pipe anti-cold leakage mechanical seal assembly according to claim 2, characterized in that, The outer wall of the third drive shaft (39) is fixed with a disc (38), a slide (311) is provided on one side of the disc (38), the third drive shaft (39) is fixed on one side of the side frame (35), and the third drive shaft (39) is slidably connected inside the slide (311).

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