Mechanical sealing element with adjustable sealing pressure

Abstract

The invention relates to the technical field of sealing elements, and discloses a sealing pressure adjustable mechanical sealing element which comprises a piston and a piston rod, a connecting seat is fixedly mounted at the top end of the piston, the bottom end of the piston rod is fixedly connected with the connecting seat, an annular groove is formed in the peripheral wall of the piston, a sealing ring is arranged in the annular groove, and a mounting cavity is formed in the piston. A plurality of through holes are formed between the mounting cavity and the annular groove, and adjusting columns are arranged in the through holes in a sliding mode; through the cooperation of the temperature sensing driving assembly and the transmission assembly, the inner diameter of the sealing ring can be automatically adjusted according to the change of the environment temperature, so that the constant pressure of the sealing ring on the inner wall of the cylinder barrel is kept, and the problem that the sealing ring expands or shrinks due to the temperature change is effectively solved through the self-adaptive adjusting mechanism; and the sealing performance in different temperature environments is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of sealing elements, in particular to a sealing pressure adjustable mechanical sealing element. Background Art

[0002] Piston mechanical seals are a key component used to prevent gas or liquid leakage in equipment such as hydraulic cylinders and pneumatic systems. Through sealing rings, gaskets and other components, friction and pressure difference are used to achieve static and dynamic sealing, ensuring efficient sealing performance under different working conditions, extending the service life of the equipment, and improving the stability and safety of the system.

[0003] Chinese patent CN221569400U discloses a mechanical seal, including a seal body, the seal body including a first engaging part and a second engaging part, the first engaging part is installed on the side of the second engaging part, an elastic receptor sealing ring is installed on the side of the second engaging part, and the elastic receptor sealing ring is respectively provided with a groove on both sides, and the second engaging part is provided with two engaging parts, and the sides of the two engaging parts are respectively provided with engaging balls, and the two engaging balls are slidingly engaged with the two grooves, and cooperate with the piston rod and the striking block. When in use, the piston rod squeezes the striking block, and the striking block squeezes the piston disc, so that the piston rod drives the piston disc to slide and connect inside the piston groove, and the sliding connection of the piston disc makes the engaging ball larger and more tightly engaged inside the groove, and through the cooperation of the piston rod and the striking block, the engaging ball can be more tightly engaged in the groove through the sliding connection of the piston disc, thereby enhancing the sealing performance of the seal and reducing the leakage of liquid or gas.

[0004] As shown in the above patent, in existing mechanical seals, the sealing ring is usually fixedly mounted on the piston. At a constant temperature, the pressure between the sealing ring and the inner wall of the cylinder remains stable. However, as the working temperature changes, the rubber sealing ring will shrink or expand due to the principle of thermal expansion, causing the pressure between the sealing ring and the inner wall of the cylinder to change. If the pressure is too high, it will increase the resistance when the piston moves; conversely, if the pressure is too low, it may cause the sealing performance to decrease. This design is not convenient for use in a working environment with a large temperature difference.

[0005] Therefore, it is necessary to provide a sealing pressure adjustable mechanical seal to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a mechanical seal with adjustable sealing pressure, which can automatically adjust the inner diameter of the sealing ring according to changes in ambient temperature through the cooperation of a temperature-sensing drive component and a transmission component, thereby maintaining a constant pressure of the sealing ring on the inner wall of the cylinder.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a sealing pressure adjustable mechanical seal, comprising a piston and a plug rod, the top end of the piston is fixedly installed with a connecting seat, the bottom end of the plug rod is fixedly connected to the connecting seat, the outer peripheral wall of the piston is provided with an annular groove, a sealing ring is arranged in the annular groove, an installation cavity is provided inside the piston, a plurality of through holes are arranged between the installation cavity and the annular groove, an adjusting column is slidably arranged in the through hole, one end of the adjusting column extends into the installation cavity, the other end of the adjusting column extends into the annular groove, and an adjusting plate is fixedly installed on the end of the adjusting column extending into the annular groove, the adjusting The plate fits with the inner circumferential wall of the sealing ring, and an adjusting cone is slidably installed inside the installation cavity. One end of the adjusting column extending into the installation cavity fits with the side wall of the adjusting cone, and the contact surface between the adjusting column and the adjusting cone is an inclined surface. An adjusting screw is rotatably installed on the top wall of the adjusting cone, and the adjusting screw is threadedly connected to the piston. A transmission assembly for driving the adjusting screw to rotate is provided inside the connecting seat, and a temperature sensing drive assembly is provided inside the plug rod. When the working environment temperature changes, the temperature sensing drive assembly drives the adjusting screw to rotate through the transmission assembly to drive the adjusting cone to rise and fall, thereby driving multiple adjusting columns to move to adjust the inner diameter of the sealing ring.

[0008] The present invention is further configured as follows: the transmission assembly includes a first bevel gear, a connecting shaft and a rack, the first bevel gear is fixedly mounted on the top end of the adjusting screw, the connecting shaft is rotatably mounted inside the connecting seat, one end of the connecting shaft is fixedly sleeved with a second bevel gear, the other end of the connecting shaft is fixedly sleeved with a spur gear, the first bevel gear is meshed with the second bevel gear, the rack is meshed with the spur gear, a connecting block is fixedly mounted on the top end of the spur gear, and the temperature sensing drive assembly is transmission-connected to the connecting block to drive the connecting block to rise and fall.

[0009] The present invention is further configured as follows: the temperature-sensing drive assembly includes a mounting tube, a slider and a telescopic column, the mounting tube is fixedly mounted inside the plug rod, the slider is slidably mounted inside the mounting tube, the top end of the telescopic column extends into the mounting tube, and the top end of the telescopic column is fixedly connected to the slider, the bottom end of the telescopic column is fixedly connected to the connecting block, and a thermal expansion element is arranged in the mounting tube.

[0010] The present invention is further configured as follows: the thermal expansion element includes a thermal expansion block, a mounting strip and a locking block, the locking block is arranged inside the mounting tube, and the locking block is threadedly connected to the mounting tube, a plurality of thermal expansion blocks are provided, the bottom end of the mounting strip is fixedly connected to the slider, a plurality of the thermal expansion blocks are stacked in sequence between the slider and the locking block, a mounting hole is opened in the middle of the thermal expansion block, the mounting strip passes through the mounting hole, the top end of the mounting strip passes through the locking block, and the mounting strip is fixedly connected to the locking block.

[0011] The present invention is further configured as follows: a fixing clip is installed in the middle of the top of the locking block, the mounting bar extends into the fixing clip, the mounting bar can be locked by the fixing clip, thereby achieving a fixed connection between the locking block and the mounting bar, and two slots are provided on the top wall of the locking block.

[0012] The present invention is further configured as follows: a first inclined surface is formed at one end of the adjusting column extending into the installation cavity, a plurality of second inclined surfaces are formed on the side wall of the adjusting cone, the number of the second inclined surfaces is the same as the number of the adjusting columns, and the first inclined surface fits the second inclined surface.

[0013] The present invention is further configured as follows: at least two limit columns are fixedly mounted on the top end of the adjusting cone, a slide groove matching the limit columns is provided inside the piston, the top end of the limit column extends into the slide groove, and the limit column and the slide groove are slidably matched.

[0014] The present invention is further configured as follows: a plurality of connecting pins are fixedly mounted on the outer wall of the adjustment plate, a limiting cap is provided at the end of the connecting pin, a plurality of adapting grooves are opened on the inner circumferential wall of the sealing ring, and the connecting pins are inserted into the adapting grooves.

[0015] The present invention is further configured as follows: an elastic connector is provided between two adjacent adjustment plates, two sides of the elastic connector are respectively fixedly connected to the ends of the two adjustment plates, and the elastic connector is made of elastic rubber material.

[0016] In summary, the present invention has the following beneficial effects: the present invention can automatically adjust the inner diameter of the sealing ring according to the change of ambient temperature through the cooperation of the temperature-sensing drive component and the transmission component, so as to maintain the constant pressure of the sealing ring on the inner wall of the cylinder. This adaptive adjustment mechanism effectively solves the problem of expansion or contraction of the sealing ring caused by temperature changes, and ensures the sealing performance under different temperature environments. Since the sealing ring can adaptively adjust the inner diameter, the wear and leakage caused by temperature changes are reduced, thereby reducing the maintenance frequency and maintenance cost of the equipment. In addition, when the outer ring of the sealing ring is worn out after long-term use, the sealing performance can be ensured by increasing the inner diameter of the sealing ring, which further improves the reliability of the equipment. By adjusting the initial position adjustment function of the cone, it can adapt to different usage scenarios and initial pressure requirements, so that the seal has a wider range of applications, whether in high temperature, low temperature or normal temperature environment, it can maintain a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a cross-sectional structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the structure of the adjusting cone, adjusting screw and transmission assembly of the present invention; Figure 4 is a schematic cross-sectional structural diagram of a sealing ring of the present invention; Figure 5 It is a schematic structural diagram of the adjusting column and the adjusting plate of the present invention; Figure 6 It is a schematic structural diagram of the adjusting cone and the limiting column of the present invention; Figure 7 It is a structural schematic diagram of the temperature sensing drive component of the present invention; Figure 8 for Figure 7 A schematic diagram of the enlarged structure at point A; Fig. 9 It is a schematic diagram of the top view of the locking block of the present invention; Fig.10 It is a schematic diagram of the top view of the thermal expansion block of the present invention.

[0018] In the figure: 1. piston; 101. annular groove; 102. through hole; 103. mounting cavity; 104. slide groove; 2. connecting seat; 3. plug rod; 4. sealing ring; 401. adapter groove; 5. adjusting cone; 501. second inclined surface; 6. adjusting column; 601. first inclined surface; 7. adjusting plate; 8. connecting pin; 801. limiting cap; 9. elastic connecting piece; 10. adjusting screw; 11. limiting column; 12. first bevel gear; 13. connecting shaft; 14. second bevel gear; 15. spur gear; 16. rack; 17. connecting block; 18. mounting cylinder; 19. telescopic column; 20. sliding block; 21. mounting strip; 22. thermal expansion block; 2201. mounting hole; 23. sealing cover; 24. locking block; 2401. slot; 25. fixing clamp. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] See also Figure 1 to Figure 7In an embodiment of the present invention, a sealing pressure adjustable mechanical seal comprises a piston 1 and a plug rod 3, a connecting seat 2 is fixedly installed on the top of the piston 1, and the bottom end of the plug rod 3 is fixedly connected to the connecting seat 2, an annular groove 101 is provided on the outer peripheral wall of the piston 1, a sealing ring 4 is arranged in the annular groove 101, an installation cavity 103 is provided inside the piston 1, a plurality of through holes 102 are arranged between the installation cavity 103 and the annular groove 101, and the plurality of through holes 102 are distributed in an annular array with the axis of the piston 1 as the array center, an adjusting column 6 is slidably arranged in the through hole 102, one end of the adjusting column 6 extends into the installation cavity 103, and the other end of the adjusting column 6 extends into the annular groove 101, and an adjusting plate 7 is fixedly installed on the end of the adjusting column 6 extending into the annular groove 101, the adjusting plate 7 is fitted with the inner peripheral wall of the sealing ring 4, the adjusting plate 7 is arranged in an arc structure, an adjusting cone 5 is slidably installed inside the installation cavity 103, and the adjusting cone 5 is a cone shaped structure, one end of the adjusting column 6 extending into the installation cavity 103 is fitted with the side wall of the adjusting cone 5, and the contact surface between the adjusting column 6 and the adjusting cone 5 is an inclined surface, specifically, a first inclined surface 601 is provided at one end of the adjusting column 6 extending into the installation cavity 103, and a plurality of second inclined surfaces 501 are provided on the side wall of the adjusting cone 5, the number of the second inclined surfaces 501 is the same as the number of the adjusting columns 6, the first inclined surface 601 is fitted with the second inclined surface 501, an adjusting screw 10 is rotatably installed on the top wall of the adjusting cone 5, the adjusting screw 10 is threadedly connected to the piston 1, the top end of the adjusting screw 10 extends into the interior of the connecting seat 2, a transmission assembly for driving the adjusting screw 10 to rotate is provided inside the connecting seat 2, a temperature sensing driving assembly is provided inside the plug rod 3, when the working environment temperature changes, the temperature sensing driving assembly drives the adjusting screw 10 to rotate through the transmission assembly, so as to drive the adjusting cone 5 to rise and fall, thereby driving the plurality of adjusting columns 6 to move, so as to adjust the inner diameter of the sealing ring 4;Specifically, when the ambient temperature rises, the adjusting cone 5 moves upward, so that the adjusting column 6 moves toward the installation cavity 103 under the pressure of the sealing ring 4, so that the inner diameter of the sealing ring 4 decreases, thereby compensating for the influence of the expansion of the sealing ring 4 caused by the temperature rise, so that the pressure change of the outer peripheral wall of the sealing ring 4 on the inner wall of the cylinder is smaller, and the sealing ring 4 is prevented from expanding in a high temperature environment and increasing its pressure on the inner wall of the cylinder. When the ambient temperature drops, the adjusting cone 5 moves downward, so that the adjusting column 6 moves in a direction away from the installation cavity 103 under the push of the second inclined surface 501 of the adjusting cone 5, thereby pushing the adjusting plate 7 to move, so that the inner diameter of the sealing ring 4 increases, thereby compensating for the temperature drop. The influence caused by the shrinkage of the sealing ring 4 makes the pressure change of the outer peripheral wall of the sealing ring 4 on the inner wall of the cylinder less, and avoids the shrinkage of the sealing ring 4 in a low temperature environment to reduce the pressure on the inner wall of the cylinder, so that the sealing ring 4 on the piston 1 can adaptively adjust the inner diameter at different ambient temperatures to balance the influence of the sealing ring 4 due to thermal expansion and contraction, so that the pressure of the sealing ring 4 on the inner wall of the cylinder will not be too large or too small, and the initial position of the adjusting cone 5 can be adjusted, so that the initial pressure of the sealing ring 4 on the inner wall of the cylinder can be adjusted to adapt to different usage scenarios, and after the outer ring of the sealing ring 4 is worn out due to long-term use, the inner diameter of the sealing ring 4 can be increased to ensure sealing. ;

[0021] In this embodiment, preferably, the transmission assembly includes a first bevel gear 12, a connecting shaft 13 and a rack 16, the first bevel gear 12 is fixedly mounted on the top of the adjusting screw 10, the connecting shaft 13 is rotatably mounted inside the connecting seat 2, one end of the connecting shaft 13 is fixedly sleeved with a second bevel gear 14, the other end of the connecting shaft 13 is fixedly sleeved with a spur gear 15, the first bevel gear 12 is meshed with the second bevel gear 14, the rack 16 is meshed with the spur gear 15, and a connecting block 17 is fixedly mounted on the top of the spur gear 15, the temperature sensing drive assembly is transmission-connected to the connecting block 17 to drive the connecting block 17 to rise and fall, specifically, when the ambient temperature rises, the temperature sensing drive assembly is transmission-connected to the connecting block 17 to drive the connecting block 17 to rise and fall, and ... The temperature sensing drive component drives the connecting block 17 to descend. At this time, the connecting block 17 drives the spur gear 15 to rotate through the rack 16, thereby driving the connecting shaft 13 to rotate. The rotation of the connecting shaft 13 drives the first bevel gear 12 to rotate through the second bevel gear 14, so that the adjusting screw 10 moves upward, thereby driving the adjusting cone 5 to move upward. When the ambient temperature drops, the temperature sensing drive component drives the connecting block 17 to rise. At this time, the connecting block 17 drives the spur gear 15 to rotate in the opposite direction through the rack 16, thereby driving the connecting shaft 13 to rotate in the opposite direction. The reverse rotation of the connecting shaft 13 drives the first bevel gear 12 to rotate in the opposite direction through the second bevel gear 14, so that the adjusting screw 10 moves downward, thereby driving the adjusting cone 5 to move downward.

[0022] In this embodiment, preferably, the temperature-sensing drive assembly includes a mounting tube 18, a slider 20 and a telescopic column 19, the mounting tube 18 is fixedly mounted inside the plug rod 3, the slider 20 is slidably mounted inside the mounting tube 18, the top end of the telescopic column 19 extends into the mounting tube 18, and the top end of the telescopic column 19 is fixedly connected to the slider 20, the bottom end of the telescopic column 19 is fixedly connected to the connecting block 17, and a thermal expansion element is arranged in the mounting tube 18; when the ambient temperature rises, the temperature of the thermal expansion element rises and expands, thereby pushing the slider 20 to move downward, and when the slider 20 moves downward, the connecting block 17 is pushed downward by the telescopic column 19, and when the ambient temperature drops, the temperature of the thermal expansion element drops and contracts, thereby pulling the slider 20 to move upward, and when the slider 20 moves upward, the connecting block 17 is pushed upward by the telescopic column 19.

[0023] In this embodiment, preferably, at least two limit columns 11 are fixedly installed on the top of the adjusting cone 5, and a slide groove 104 adapted to the limit column 11 is opened inside the piston 1, and the top of the limit column 11 extends into the slide groove 104, and the limit column 11 and the slide groove 104 are slidably matched; thereby, the adjusting cone 5 is slidably installed in the installation cavity 103, so that the adjusting cone 5 will not rotate with the adjusting screw 10 when it is raised or lowered.

[0024] In this embodiment, preferably, a plurality of connecting pins 8 are fixedly installed on the outer wall of the adjustment plate 7, and a limiting cap 801 is provided at the end of the connecting pin 8, and the diameter of the limiting cap 801 is larger than the diameter of the connecting pin 8 to ensure the firmness of the connection between the connecting pin 8 and the sealing ring 4, and a plurality of adapting grooves 401 are provided on the inner wall of the sealing ring 4, and the connecting pin 8 is inserted into the adapting groove 401; by setting the connecting pin 8 and the adapting groove 401, the firmness of the installation of the sealing ring 4 can be improved to prevent the sealing ring 4 from falling off the piston 1.

[0025] In this embodiment, preferably, an elastic connector 9 is provided between two adjacent adjustment plates 7, and the two sides of the elastic connector 9 are fixedly connected to the ends of the two adjustment plates 7 respectively. The elastic connector 9 is made of elastic rubber material. Through the setting of the elastic connector 9, the gap between the adjustment plates 7 can be filled, so that when the adjustment plate 7 moves, the inner circumferential wall of the sealing ring 4 is prevented from sinking into the gap between the adjustment plates 7 and being squeezed and damaged.

[0026] See also Figure 7 to Figure 10In the embodiment of the present invention, the thermal expansion element includes a thermal expansion block 22, a mounting strip 21 and a locking block 24. The locking block 24 is arranged inside the mounting tube 18, and the locking block 24 is threadedly connected to the mounting tube 18. A plurality of thermal expansion blocks 22 are provided. The bottom end of the mounting strip 21 is fixedly connected to the slider 20. The plurality of thermal expansion blocks 22 are sequentially stacked between the slider 20 and the locking block 24. A mounting hole 2201 is opened in the middle of the thermal expansion block 22. The mounting strip 21 passes through the mounting hole 2201. The top end of the mounting strip 21 passes through the locking block 24, and the mounting strip 21 is fixedly connected to the locking block 24. The thermal expansion block 22 and the mounting strip The strips 21 are all made of rubber material, which expands when heated and contracts when cooled. When the ambient temperature rises, the thermal expansion block 22 expands, thereby pushing the slider 20 to move downward, causing the telescopic column 19 to move downward. When the ambient temperature drops, the mounting strip 21 contracts, thereby pulling the slider 20 to move upward, causing the telescopic column 19 to move upward. The top thread of the mounting tube 18 is threaded with a cover 23. After opening the cover 23, the locking block 24 can be removed, and then the thermal expansion blocks 22 can be added or reduced. The more thermal expansion blocks 22 there are, the greater the distance the slider 20 moves per unit temperature, thereby being able to adjust the moving distance of the adjustment plate 7 under a single temperature according to usage requirements.

[0027] In this embodiment, preferably, a fixing clip 25 is installed in the middle of the top of the locking block 24, and the mounting strip 21 extends into the fixing clip 25. The mounting strip 21 can be locked by the fixing clip 25, so as to realize the fixed connection between the locking block 24 and the mounting strip 21. The top wall of the locking block 24 is provided with two slots 2401, and a tool can be inserted into the slots 2401 to rotate the locking block 24, so that the locking block 24 rises or falls, so as to realize the disassembly and installation of the locking block 24, and when the locking block 24 is adjusted to move downward, the slider 20 can be pushed downward by the expansion block to increase the initial pressure of the sealing ring 4 on the outer wall of the cylinder barrel, and after the outer ring of the sealing ring 4 is worn out due to long-term use, the inner diameter of the sealing ring 4 can be increased to ensure the sealing.

[0028] The sealing ring 4 on the piston 1 can adaptively adjust the inner diameter under different ambient temperatures to balance the influence of thermal expansion and contraction of the sealing ring 4. The specific adjustment method is: When the ambient temperature rises, the temperature of the thermal expansion element rises and expands, thereby pushing the slider 20 to move downward. When the slider 20 moves downward, the connecting block 17 is pushed downward by the telescopic column 19. When the connecting block 17 moves downward, the rack 16 drives the spur gear 15 to rotate, thereby driving the connecting shaft 13 to rotate. The rotation of the connecting shaft 13 drives the first bevel gear 12 to rotate through the second bevel gear 14, so that the adjusting screw 10 moves upward, thereby driving the adjusting cone 5 to move upward. The upward movement of the adjusting cone 5 causes the adjusting column 6 to move toward the installation cavity 103 under the pressure of the sealing ring 4, so that the inner diameter of the sealing ring 4 is reduced, thereby compensating for the influence of the expansion of the sealing ring 4 caused by the temperature rise, so that the pressure change of the outer peripheral wall of the sealing ring 4 on the inner wall of the cylinder is small, and the sealing ring 4 is prevented from expanding in a high temperature environment and increasing its pressure on the inner wall of the cylinder. When the ambient temperature drops, the temperature of the thermal expansion element drops and contracts, thereby pulling the slider 20 to move upward. When the slider 20 moves upward, the connecting block 17 is pushed upward by the telescopic column 19. When the connecting block 17 moves upward, the rack 16 drives the spur gear 15 to rotate in the opposite direction, thereby driving the connecting shaft 13 to rotate in the opposite direction. The reverse rotation of the connecting shaft 13 drives the first bevel gear 12 to rotate in the opposite direction through the second bevel gear 14, so that the adjusting screw 10 moves downward, thereby driving the adjusting cone 5 to move downward. When the adjusting cone 5 moves downward, the adjusting column 6 moves in a direction away from the installation cavity 103 under the push of the second inclined surface 501 of the adjusting cone 5, thereby pushing the adjusting plate 7 to move, so that the inner diameter of the sealing ring 4 increases, thereby compensating for the influence of the shrinkage of the sealing ring 4 caused by the temperature reduction, so that the pressure change of the outer peripheral wall of the sealing ring 4 on the inner wall of the cylinder is small, thereby avoiding the shrinkage of the sealing ring 4 in a low temperature environment and reducing the pressure on the inner wall of the cylinder.

[0029] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A sealing pressure adjustable mechanical seal, comprising a piston (1) and a plug rod (3), wherein a connecting seat (2) is fixedly mounted on the top end of the piston (1), and a bottom end of the plug rod (3) is fixedly connected to the connecting seat (2), an annular groove (101) is formed on the outer peripheral wall of the piston (1), and a sealing ring (4) is arranged in the annular groove (101), characterized in that: The piston (1) is provided with a mounting cavity (103) inside, a plurality of through holes (102) are provided between the mounting cavity (103) and the annular groove (101), an adjusting column (6) is slidably provided in the through hole (102), one end of the adjusting column (6) extends into the mounting cavity (103), the other end of the adjusting column (6) extends into the annular groove (101), and an adjusting plate (7) is fixedly installed on the end of the adjusting column (6) extending into the annular groove (101), the adjusting plate (7) is in contact with the inner circumferential wall of the sealing ring (4), an adjusting cone (5) is slidably provided inside the mounting cavity (103), the adjusting column (6) extends into the mounting cavity (1 One end of the piston rod (3) is fitted with the side wall of the adjusting cone (5), and the contact surface between the adjusting column (6) and the adjusting cone (5) is an inclined surface. The top wall of the adjusting cone (5) is rotatably mounted with an adjusting screw (10), and the adjusting screw (10) is threadedly connected to the piston (1). A transmission component for driving the adjusting screw (10) to rotate is arranged inside the connecting seat (2). A temperature sensing drive component is arranged inside the plug rod (3). When the working environment temperature changes, the temperature sensing drive component drives the adjusting screw (10) to rotate through the transmission component to drive the adjusting cone (5) to rise and fall, thereby driving the plurality of adjusting columns (6) to move, so as to adjust the inner diameter of the sealing ring (4).

2. The sealing pressure adjustable mechanical seal according to claim 1, characterized in that: The transmission assembly comprises a first bevel gear (12), a connecting shaft (13) and a rack (16); the first bevel gear (12) is fixedly mounted on the top end of the adjusting screw (10); the connecting shaft (13) is rotatably mounted inside the connecting seat (2); one end of the connecting shaft (13) is fixedly sleeved with a second bevel gear (14); the other end of the connecting shaft (13) is fixedly sleeved with a spur gear (15); the first bevel gear (12) is meshed with the second bevel gear (14); the rack (16) is meshed with the spur gear (15); a connecting block (17) is fixedly mounted on the top end of the spur gear (15); the temperature sensing drive assembly is transmission-connected to the connecting block (17) to drive the connecting block (17) to rise and fall.

3. The sealing pressure adjustable mechanical seal according to claim 2, characterized in that: The temperature-sensing drive assembly comprises a mounting tube (18), a slider (20) and a telescopic column (19); the mounting tube (18) is fixedly mounted inside the plug rod (3); the slider (20) is slidably mounted inside the mounting tube (18); the top end of the telescopic column (19) extends into the mounting tube (18), and the top end of the telescopic column (19) is fixedly connected to the slider (20); the bottom end of the telescopic column (19) is fixedly connected to the connecting block (17); and a thermal expansion element is arranged inside the mounting tube (18).

4. The sealing pressure adjustable mechanical seal according to claim 3, characterized in that: The thermal expansion element comprises a thermal expansion block (22), a mounting strip (21) and a locking block (24); the locking block (24) is arranged inside the mounting tube (18), and the locking block (24) is threadedly connected to the mounting tube (18); a plurality of thermal expansion blocks (22) are provided; the bottom end of the mounting strip (21) is fixedly connected to the slider (20); the plurality of thermal expansion blocks (22) are stacked in sequence between the slider (20) and the locking block (24); a mounting hole (2201) is provided in the middle of the thermal expansion block (22); the mounting strip (21) passes through the mounting hole (2201); the top end of the mounting strip (21) passes through the locking block (24); and the mounting strip (21) is fixedly connected to the locking block (24).

5. The sealing pressure adjustable mechanical seal according to claim 4, characterized in that: A fixing clip (25) is installed in the middle of the top of the locking block (24), and the mounting strip (21) extends into the fixing clip (25), thereby achieving a fixed connection between the locking block (24) and the mounting strip (21), and the top wall of the locking block (24) is provided with two slots (2401).

6. The sealing pressure adjustable mechanical seal according to claim 1, characterized in that: A first inclined surface (601) is formed on one end of the adjusting column (6) extending into the installation cavity (103), and a plurality of second inclined surfaces (501) are formed on the side wall of the adjusting cone (5), the number of the second inclined surfaces (501) being the same as the number of the adjusting columns (6), and the first inclined surface (601) and the second inclined surfaces (501) are in close contact with each other.

7. The sealing pressure adjustable mechanical seal according to claim 1, characterized in that: At least two limiting columns (11) are fixedly mounted on the top end of the adjusting cone (5); a slide groove (104) matching the limiting columns (11) is provided inside the piston (1); the top end of the limiting column (11) extends into the slide groove (104), and the limiting column (11) and the slide groove (104) are slidably matched.

8. The sealing pressure adjustable mechanical seal according to claim 1, characterized in that: A plurality of connecting pins (8) are fixedly mounted on the outer wall of the adjustment plate (7), and a limiting cap (801) is provided at the end of each connecting pin (8). A plurality of adapting grooves (401) are provided on the inner wall of the sealing ring (4), and the connecting pins (8) are inserted into the adapting grooves (401).

9. The sealing pressure adjustable mechanical seal according to claim 1, characterized in that: An elastic connecting member (9) is provided between two adjacent adjusting plates (7), and two sides of the elastic connecting member (9) are respectively fixedly connected to the ends of the two adjusting plates (7), and the elastic connecting member (9) is made of an elastic rubber material.

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