Mechanical seal

Abstract

The invention relates to the technical field of mechanical seals, in particular to a mechanical seal which comprises a shaft sleeve, a sleeve is arranged on the outer side of the shaft sleeve, mounting flanges are arranged at the two ends of the sleeve, static ring blocks are arranged at the ends, facing the sleeve, of the mounting flanges, and pressure sensing elements are arranged at the joints of the static ring blocks and the mounting flanges. A movable ring assembly is arranged on the outer side of the shaft sleeve and comprises an installation ring block arranged on the outer side of the shaft sleeve, movable ring blocks abutting against the static ring blocks are arranged at the two ends of the installation ring block, and elastic parts are arranged between the movable ring blocks and the installation ring block. A main channel and branch channels are distributed in the middle of the mounting ring block in a staggered mode, and switching parts are arranged in communication areas of the main channel and the branch channels. The communication state of the main channel and the branch channel is adjusted through the switching part, fine adjustment of the acting force of the movable ring block and the static ring block is achieved, the problem of overheating abrasion caused by too large pressure is effectively avoided, and the situation that the sealing efficiency is affected due to insufficient abutting force caused by performance attenuation of the elastic part is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical seals, and in particular to a mechanical seal. Background Art

[0002] Mechanical seals are key devices for preventing fluid leakage. Their core structure consists of at least one set of end faces perpendicular to the axis of rotation. Fluid pressure, the elastic (or magnetic) force exerted by a compensating mechanism, and auxiliary seals combine to ensure close contact and smooth relative sliding motion.

[0003] The core function of mechanical seals is to effectively prevent fluid leakage. However, in practical applications, various factors (such as wear of the sealing ring, deviations during installation, and fluctuations in operating conditions) can cause sealing performance to fail, leading to leakage. Furthermore, during operation, mechanical seals generate heat due to friction between the end faces. This can cause thermal deformation of key components such as the sealing ring, ultimately adversely affecting the sealing effect.

[0004] Chinese patent application number CN202210580673.3 discloses a non-contact, high-temperature mechanical seal comprising a shaft sleeve, a rotating ring, a stationary ring, a pumping ring, pumping blades I and II, and a secondary gland. The shaft sleeve is provided with pumping holes I and II. Using the shaft's rotational motion, a series arrangement of four pumps (pumping holes I, II, pumping blades I, and II) allows coolant to flow sequentially around the internal cavities of the rotating and stationary rings, removing heat applied to the sealing rings and lubricating film by the high-temperature medium and friction between the sealing surfaces. This reduces the temperatures of the sealing rings and lubricating film, inhibits lubricating film vaporization, and enhances the mechanical seal's effectiveness. The series arrangement of pumps creates a strong driving force for coolant delivery, enabling self-circulating cooling of the coolant. The pumping capacity of pumping holes I, II, and pumping blades I, II is positively correlated with the seal's rotational speed. As the speed increases, causing the frictional temperature of the seal end faces to rise, the pumping capacity is automatically increased, enhancing cooling intensity and thus automatically adjusting the cooling intensity.

[0005] Although the aforementioned patent document proposes a structure that uses a series pump to reduce the temperature of the sealing ring and lubricating film, thereby improving the effectiveness of the mechanical seal, in actual engineering applications, existing mechanical sealing technologies often rely on springs to maintain close contact between the dynamic and static rings. However, after long-term operation, the springs are prone to fatigue and gradually lose their original elasticity. With the accumulation of usage time and changes in working environment conditions, the elastic force of the springs will continue to decay, causing the thrust between the dynamic and static rings to become unstable, thereby weakening the sealing performance and significantly increasing the risk of seal failure. Summary of the Invention

[0006] The purpose of the present invention is to provide a mechanical seal to solve the technical problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: A mechanical seal comprises a shaft sleeve, a sleeve is provided on the outer side of the shaft sleeve, and mounting flanges are provided at both ends of the sleeve; A stationary ring block is provided at one end of the mounting flange facing the sleeve; The dynamic ring assembly includes a mounting ring block arranged outside the shaft sleeve, with dynamic ring blocks abutting against the static ring block at both ends of the mounting ring block, and an elastic portion provided between the dynamic ring block and the mounting ring block; The liquid inlet and the liquid outlet are arranged on the outside of the sleeve. The coolant is introduced into the accommodating cavity between the sleeve and the mounting ring block through the liquid inlet, and then the coolant is discharged from the accommodating cavity through the liquid outlet.

[0008] Preferably, the elastic portion includes a sleeve provided between the moving ring block and the mounting ring block, and a first elastic member is provided inside the sleeve.

[0009] Preferably, the middle part of the mounting ring block is provided with staggered main channels and branch channels, wherein the main channel is connected to the elastic part, and the branch channel is connected to the main channel, and the connecting areas of the main channel and the branch channels are provided with switching parts, and the switching parts are used to adjust the connecting state of the main channel and the branch channels.

[0010] Preferably, the switching unit includes: A switching frame is arranged inside the main channel and can slide along the axial direction of the main channel; One end of the second elastic member is connected to the switching frame, and the other end is connected to the conducting block arranged on the mounting ring block.

[0011] Preferably, when the switching frame is in the first position, the main channel and the branch channel are in a disconnected state; When the switching frame is in the second position, the main channel and the branch channel are in a connected state; When the switching frame is in the third position, the upper half of the main channel is in communication with the branch channel.

[0012] Preferably, symmetrically distributed electromagnetic components are provided on the inner side of the sleeve, and the positions of the electromagnetic components correspond to the area where the main channel is located.

[0013] Preferably, a spoiler assembly is provided on the opposite end faces of the moving ring block and the static ring block. When the spoiler assembly is in an extended state, the spoiler assembly disturbs and cleans the abutting end faces of the moving ring block and the static ring block during the rotation of the moving ring block.

[0014] Preferably, there is a gap area between the abutting end surfaces of the dynamic ring block and the static ring block for the expansion and contraction of the spoiler assembly.

[0015] Preferably, the spoiler assembly comprises: A movable groove is located at the end of the movable ring block and is provided with a slidable movable blade; A pulling member, one end of which is connected to the moving blade, and the other end of which is connected to the switching frame corresponding to the moving blade on the other side; The third elastic member has one end connected to the movable blade and the other end connected to the movable groove.

[0016] Preferably, a pressure sensing element is provided at the connection between the stationary ring block and the mounting flange.

[0017] Technical effects and advantages of the present invention: 1. Based on feedback from the pressure detection unit, the present invention dynamically adjusts the connectivity between the main and branch channels, controls the openings of the liquid inlet and outlet, and achieves fine-tuning of the forces acting on the dynamic and static ring blocks. This effectively avoids overheating and wear caused by excessive pressure, and prevents the elastic part's performance degradation from causing insufficient contact force and affecting sealing efficiency. At the same time, the switching racks in the two independent areas are independently controlled to ensure that when there are differences in pressure detection values, the switching racks can be adaptively adjusted to different pressure conditions, ensuring stable system operation and efficient sealing, extending the device's service life, and reducing maintenance costs.

[0018] 2. The present invention arranges a turbulence component on the opposite end faces of the dynamic ring block and the static ring block. When the pressure detection unit measures the pressure fluctuation of the static ring block in a certain area, the control unit adjusts the pressure of the accommodating chamber to move the switching frame to change the abutment force between the dynamic ring block and the static ring block. At the same time, the moving blade is extended through the pulling member to form a dynamic disturbance flow field of the coolant on the abutment end face; since the abutment force between the dynamic ring block and the static ring block is reduced, the disturbance flow field can better clean the resident particles and avoid excessive wear caused by impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the dynamic ring assembly of the present invention; Figure 2 This is a schematic structural diagram of the dynamic ring block of the present invention; Figure 3 Schematic diagram of the cross-sectional structure of the dynamic ring assembly of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at A in the middle; Figure 5 Schematic diagram of the cross-sectional structure of the dynamic ring block and the static ring block of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at B in the middle; Figure 7 This is a structural schematic diagram of the switching frame of the present invention when it is in the first working state; Figure 8 It is a structural schematic diagram of the switching frame of the present invention when it is in the second working state; Figure 9 This is a structural diagram of the switching frame of the present invention when it is in the third working state; Figure 10 Schematic diagram of the supply process of the coolant of the present invention.

[0020] In the picture: 1. Bushing; 2. Sleeve; 3. Install the flange; 4. Static ring block; 5. Dynamic ring assembly; 501. Mounting ring block; 502. Elastic portion; 5021. Sleeve; 5022. First elastic member; 503. Dynamic ring block; 6. Switching unit; 601. Switching frame; 602. Second elastic member; 7. spoiler assembly; 701. movable slot; 702. movable blade; 703. pulling member; 704. third elastic member; 8. Liquid inlet; 9. Liquid outlet; 10. Main channel; 11. Branch channel; 12. Electromagnetic components; 13. Gap area. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] Example 1 Reference Figures 1 to 10 As shown, the present invention provides a mechanical seal including a sleeve 1, a sleeve 2 disposed on the outside of the sleeve 1, mounting flanges 3 disposed at both ends of the sleeve 2, and a stationary ring block 4 disposed on the end of the mounting flange 3 facing the sleeve 2. An anti-rotation block is disposed at the connection between the mounting flange 3 and the stationary ring block 4, which is used to lock the stationary ring block 4 to prevent rotation.

[0023] A pressure sensing element is provided at the connection between the stationary ring block 4 and the mounting flange 3. The pressure sensing element includes a pressure sensor, which is used to detect the pressure value exerted on the stationary ring block 4.

[0024] Reference Figures 1 to 3 As shown, a dynamic ring assembly 5 is provided on the outside of the shaft sleeve 1. The dynamic ring assembly 5 includes a mounting ring block 501 arranged on the outside of the shaft sleeve 1. The mounting ring block 501 is fixedly connected to the shaft sleeve 1 by fastening bolts; both ends of the mounting ring block 501 are provided with dynamic ring blocks 503 abutting against the static ring block 4. The dynamic ring block 503 can move axially along the mounting ring block 501, and an elastic part 502 is provided between the dynamic ring block 503 and the mounting ring block 501.

[0025] Reference Figures 3 and 4 As shown, the elastic portion 502 includes a sleeve 5021 disposed between the movable ring block 503 and the mounting ring block 501, with a first elastic member 5022 disposed within the sleeve 5021. The sleeve 5021 comprises a telescopic bellows, preferably a double-layer bellows; one end of the telescopic bellows is fixedly connected to the movable ring block 503, and the other end is fixedly connected to the mounting ring block 501. The first elastic member 5022 comprises a spring, one end of which is fixedly connected to the movable ring block 503, and the other end is fixedly connected to the mounting ring block 501.

[0026] Reference Figure 3 As shown, a receiving chamber is provided between the sleeve 2 and the mounting ring block 501. A liquid inlet 8 and a liquid outlet 9 are provided on the outside of the sleeve 2. Coolant is introduced into the receiving chamber between the sleeve 2 and the mounting ring block 501 through the liquid inlet 8, and then discharged from the receiving chamber through the liquid outlet 9. Regulating valves are provided in both the liquid inlet 8 and the liquid outlet 9 to control the flow of coolant into the receiving chamber.

[0027] Reference Figures 1 to 4 As shown, the middle part of the mounting ring block 501 is provided with staggered main channels 10 and branch channels 11, wherein the main channel 10 is connected to the elastic part 502, and the branch channel 11 is connected to the main channel 10, and the connecting areas of the main channel 10 and the branch channels 11 are provided with a switching part 6 for adjusting the connecting state of the main channel 10 and the branch channels 11.

[0028] Reference Figure 4 As shown, the switching unit 6 includes a switching frame 601 disposed within the main channel 10. The switching frame 601 can slide axially along the main channel 10. A second elastic member 602 is provided at the end of the switching frame 601. The end of the second elastic member 602, which is away from the switching frame 601, is connected to a conductive block disposed on the mounting ring block 501. The second elastic member 602 comprises a spring, one end of which is connected to the switching frame 601 and the other end to the conductive block. The conductive block is fixedly connected to the main channel 10 and has a through-hole in the middle. A magnetic block is provided on each switching frame 601.

[0029] Reference Figures 3 and 4As shown, symmetrically distributed electromagnetic components 12 are provided on the inner side of the sleeve 2 . The electromagnetic components 12 are ring-shaped, and the positions of the electromagnetic components 12 correspond to the area where the main channel 10 is located.

[0030] In the initial state, the switching frame 601 is in the first position (specifically, Figure 7 As shown), the switching frame 601 blocks the branch channel 11, and the main channel 10 and the branch channel 11 are in a non-connected state.

[0031] During use, the dynamic ring block 503 and the static ring block 4 fit tightly together under the combined action of the medium pressure and the elastic compensation mechanism, forming a dynamic sealing interface, thereby achieving the effect of zero leakage or slight leakage of the medium. When the sleeve 1 is not rotating, the elastic part 502 provides the dynamic ring block 503 and the static ring block 4 with initial pressing force, ensuring that the equipment is still sealed when not in operation, and compensating for the gap caused by end face wear; when the sleeve 1 is rotating, the elastic part 502 automatically compensates for the end face wear or shaft movement between the dynamic ring block 503 and the static ring block 4. The working principle of achieving mechanical sealing through the dynamic ring block 503 and the static ring block 4 belongs to the existing technology and will not be elaborated on here.

[0032] During the process of the shaft sleeve 1 driving the dynamic ring block 503 to rotate continuously with the help of the mounting ring block 501, the cooling liquid is delivered to the accommodating cavity through the external liquid inlet pump. The cooling liquid enters the accommodating cavity through the regulating valve at the liquid inlet 8. The cooling liquid in the accommodating cavity cools the friction surface between the dynamic ring block 503 and the static ring block 4, and at the same time flushes away the debris generated by friction and wear between the dynamic ring block 503 and the static ring block 4. The cooling liquid in the accommodating cavity is then pumped out through the external liquid outlet pump, and the cooling liquid is discharged from the accommodating cavity through the regulating valve at the liquid outlet 9. For the specific process, please refer to Figure 10 shown.

[0033] When the sleeve 1 drives the dynamic ring block 503 to rotate continuously by means of the mounting ring block 501 , the external control unit detects the pressure applied by the elastic part 502 to the static ring block 4 through the dynamic ring block 503 via the pressure detection unit.

[0034] When the pressure value of the static ring block 4 measured by the pressure detection unit is lower than the preset value, it indicates that the pressure applied by the elastic part 502 to the static ring block 4 through the dynamic ring block 503 is too small, resulting in the pressure value detected by the pressure detection unit being lower than the preset value.

[0035] In this situation, the control unit adjusts the openings of the liquid inlet 8 and liquid outlet 9 via the regulating valve. Specifically, the regulating valve increases the opening of the liquid inlet 8 to increase the flow of coolant into the accommodating chamber, while simultaneously decreasing the opening of the liquid outlet 9 to reduce the flow of coolant out of the accommodating chamber. This regulation method increases the fluid pressure of the coolant in the accommodating chamber, ensuring that it is higher than the pressure of the elastic portion 502.

[0036] After the coolant pressure in the receiving chamber increases, the control unit will supply reverse current to the electromagnetic component 12 on the sleeve 2 according to the feedback value of the pressure detection unit. After receiving power, the electromagnetic component 12 generates suction force on the switching frame 601, pulling the switching frame 601 to move to the second position (specifically, Figure 8 ), connecting the main channel 10 with the branch channel 11. At this time, the coolant in the accommodating chamber will flow into the main channel 10 through the branch channel 11 and further into the interior of the sleeve 2. After the coolant enters the sleeve 2, its fluid pressure will push the dynamic ring block 503 to apply pressure toward the static ring block 4. When the pressure detection unit detects that the pressure value on the static ring block 4 reaches the preset value, the control unit will once again drive the switching frame 601 back to the first position through the electromagnetic component 12, cutting off the connection between the main channel 10 and the branch channel 11, and restoring the original working state of the regulating valve.

[0037] On the contrary, when the pressure value of the static ring block 4 measured by the pressure detection unit is higher than the preset value, it indicates that the pressure applied to the static ring block 4 by the elastic part 502 through the dynamic ring block 503 is too large, resulting in the pressure value detected by the pressure detection unit being greater than the preset value.

[0038] In this scenario, the control system will also instruct the regulating valve to adjust the openings of liquid inlet 8 and liquid outlet 9. Specifically, the regulating valve will reduce the opening of liquid inlet 8 (or even close it directly) to reduce the flow of coolant into the chamber; while simultaneously increasing the opening of liquid outlet 9 to increase the flow of coolant out of the chamber. This regulation method reduces the fluid pressure of the coolant within the chamber, creating a negative pressure environment within the chamber.

[0039] After negative pressure is formed inside the accommodating chamber, the control unit will pass reverse current to the electromagnetic component 12 on the sleeve 2 according to the feedback value of the pressure detection unit. After the electromagnetic component 12 is energized, it generates suction, and the pulling switching frame 601 moves to the second position (specifically Figure 8 ), connecting the main channel 10 with the branch channel 11. At this point, the negative pressure inside the sleeve 2 generates a contraction force, pulling the dynamic ring block 503 away from the stationary ring block 4, thereby reducing the pressure on the stationary ring block 4. When the pressure detection unit detects that the pressure on the stationary ring block 4 has reached a preset value, the control unit drives the switching frame 601 back to the first position via the electromagnetic element 12, severing the connection between the main channel 10 and the branch channel 11 and restoring the original operating state of the regulating valve.

[0040] This embodiment establishes a precise pressure control mechanism by providing a switching frame 601 and a regulating valve. This mechanism dynamically adjusts the connectivity between the main channel 10 and the branch channel 11, and precisely controls the openings of the liquid inlet 8 and the liquid outlet 9, based on the specific pressure values ​​fed back in real time by the pressure detection unit. This allows for fine-tuning of the force between the dynamic ring block 503 and the static ring block 4. This effectively avoids the problem of overheating and wear caused by excessive pressure between the two. It also prevents the dynamic sealing performance from being affected by insufficient contact force between the dynamic ring block 503 and the static ring block 4 due to performance degradation of the elastic portion 502.

[0041] Furthermore, this embodiment implements a differentiated energy supply strategy for the corresponding electromagnetic components 12 based on the specific pressure values ​​of each stationary ring block 4 obtained by the pressure detection unit. This measure enables independent control of the switching frame 601 in two independent areas, ensuring that when there are differences in the pressure detection values, the switching frame 601 can adaptively adjust to the pressure conditions of different stationary ring blocks 4.

[0042] Specifically, when the pressures experienced by both stationary ring blocks 4 deviate from a preset value (either greater than or less than), but the degree of deviation differs significantly, this embodiment allows for precise control of the corresponding switching racks 601 using two independent electromagnetic components 12. This design prevents unnecessary pressurization or depressurization of the corresponding dynamic ring block 503 after the pressure of a single stationary ring block 4 reaches the preset value, thereby ensuring stable operation and efficient sealing of the entire system.

[0043] Example 2 Although the aforementioned embodiment can make adaptive adjustments to the pressure-bearing state of the static ring block 4 according to the switching frame 601 and the regulating valve, in actual application scenarios, metal or graphite debris will be generated when the dynamic ring block 503 and the static ring block 4 rub against each other. These debris are very easy to embed into the abutment surface between the dynamic ring block 503 and the static ring block 4. Once foreign particles intervene in the abutment surface, the actual contact pressure between the abutment surfaces will dynamically change according to the hardness and shape of the particles, thereby generating pressure fluctuations. In view of this, technical improvements are made on the basis of Example 1, and the improved technical solution is as follows: Reference Figures 1 to 10 As shown, a mechanical seal includes a spoiler assembly 7 provided on the opposite end faces of a moving ring block 503 and a stationary ring block 4. When the spoiler assembly 7 is in an extended state, the moving ring block 503 rotates and the spoiler assembly 7 disturbs and cleans the abutting end faces of the moving ring block 503 and the stationary ring block 4.

[0044] Reference Figures 5 and 6 As shown, there is a gap area 13 between the end surfaces of the dynamic ring block 503 and the static ring block 4, which is used for the expansion and contraction of the spoiler component 7.

[0045] Reference Figure 6 As shown, the spoiler assembly 7 includes a movable groove 701 opened at the end of the movable ring block 503, and a movable blade 702 is provided inside the movable groove 701. The movable blade 702 includes an annular ring slidably connected to the movable groove 701, and an array of blades is provided on the annular ring.

[0046] Reference Figure 6 As shown, a third elastic member 704 is provided between the movable blade 702 and the movable slot 701 . The third elastic member 704 includes a spring. One end of the third elastic member 704 is connected to the annular ring, and the other end is connected to the movable slot 701 .

[0047] Reference Figure 6 As shown, a pulling member 703 is provided on the outer side of the annular ring, and one end of the pulling member 703 away from the annular ring is connected to the switching frame 601 corresponding to the moving blade 702 on the other side.

[0048] As shown in the figure, the mechanical seal of this embodiment is divided into two areas, namely a primary mechanical seal located in the left area S1 and a secondary mechanical seal located in the right area S2.

[0049] During use, when the pressure value of the static ring block 4 located in the S1 area measured by the pressure detection unit is in a fluctuating state, it indicates that when the dynamic ring block 503 and the static ring block 4 in the S1 area rub against each other, the impurities and debris generated by the two are embedded in the abutting surfaces of the two, causing the actual contact pressure between the abutting surfaces to dynamically change according to the hardness and shape of the particles, thereby generating pressure fluctuations.

[0050] When the pressure value of the stationary ring block 4 in the S1 region measured by the pressure detection unit fluctuates, the control unit adjusts the opening of the liquid inlet 8 and the liquid outlet 9 via the regulating valve. Specifically, the regulating valve adjusts the opening of the liquid inlet 8 and the liquid outlet 9 to create a negative pressure environment within the accommodating chamber. The specific adjustment method is described in Example 1.

[0051] After negative pressure is formed inside the accommodation chamber, the control unit passes a reverse current to the electromagnetic member 12 in the S1 region to move the switching frame 601 to the second position (specifically, Figure 8 As shown in the figure, the main channel 10 is connected to the branch channel 11. At this point, the negative pressure inside the sleeve 2 generates a contraction force, pulling the dynamic ring block 503 away from the stationary ring block 4, thereby reducing the pressure on the stationary ring block 4. When the pressure detection unit detects that the pressure on the stationary ring block 4 has reached the cleaning threshold, the electromagnetic component 12 drives the switching frame 601 back to the first position, severing the connection between the main channel 10 and the branch channel 11, and restoring the original operating state of the regulating valve.

[0052] When the control unit applies a reverse current to the electromagnetic component 12 in the S1 area, a forward current is simultaneously applied to the electromagnetic component 12 in the S2 area, so that the electromagnetic component 12 generates a repulsive force on the switching frame 601 in the S2 area, driving the switching frame 601 in the S2 area to move toward the shaft sleeve 1, and finally causing the switching frame 601 to move to the third position (see Figure 9 During this process, the switching frame 601 pulls the moving blades 702 in the S1 region through the pulling member 703, so that the moving blades 702 extend out of the movable slot 701. As a result, when the moving ring block 503 rotates, the moving blades 702 can drive the coolant to form a dynamic disturbance flow field at the abutting end surface of the moving ring block 503 and the stationary ring block 4. Since the abutting force between the moving ring block 503 and the stationary ring block 4 in the S1 region is reduced, the disturbance flow field can better clean particles residing between the abutting end surfaces, thereby preventing the impurity particles from causing excessive wear on the abutting end surfaces between the moving ring block 503 and the stationary ring block 4.

[0053] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0054] While embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical seal comprising a shaft sleeve (1), a sleeve (2) provided on the outer side of the shaft sleeve (1), and mounting flanges (3) provided at both ends of the sleeve (2), characterized in that: A stationary ring block (4) is provided at one end of the mounting flange (3) facing the sleeve (2); A dynamic ring assembly (5), comprising a mounting ring block (501) arranged outside the shaft sleeve (1), dynamic ring blocks (503) abutting against the stationary ring block (4) being provided at both ends of the mounting ring block (501), and an elastic portion (502) being provided between the dynamic ring block (503) and the mounting ring block (501); The liquid inlet (8) and the liquid outlet (9) are arranged on the outside of the sleeve (2). Cooling liquid is introduced into the accommodating cavity between the sleeve (2) and the mounting ring block (501) through the liquid inlet (8), and then the cooling liquid is discharged from the accommodating cavity through the liquid outlet (9).

2. The mechanical seal according to claim 1, characterized in that The elastic part (502) comprises a sleeve (5021) arranged between the moving ring block (503) and the mounting ring block (501), and a first elastic member (5022) is provided inside the sleeve (5021).

3. The mechanical seal according to claim 2, characterized in that: The middle portion of the mounting ring block (501) is provided with staggered main channels (10) and branch channels (11), wherein the main channel (10) is connected to the elastic portion (502), and the branch channels (11) are connected to the main channel (10). The connecting areas of the main channel (10) and the branch channels (11) are both provided with switching portions (6), and the switching portions (6) are used to adjust the connecting state between the main channel (10) and the branch channels (11).

4. The mechanical seal according to claim 3, characterized in that The switching unit (6) includes: A switching frame (601) is arranged inside the main channel (10) and can slide along the axial direction of the main channel (10); The second elastic member (602) has one end connected to the switching frame (601) and the other end connected to the conduction block provided on the mounting ring block (501).

5. The mechanical seal according to claim 4, characterized in that When the switching frame (601) is in the first position, the main channel (10) and the branch channel (11) are in a non-connected state; When the switching frame (601) is in the second position, the main channel (10) and the branch channel (11) are in a communicating state; When the switching frame (601) is in the third position, the upper half of the main channel (10) and the branch channel (11) are in a communicating state.

6. The mechanical seal according to claim 3, characterized in that Symmetrically distributed electromagnetic components (12) are provided on the inner side of the sleeve (2), and the positions of the electromagnetic components (12) correspond to the area where the main channel (10) is located.

7. The mechanical seal according to claim 4, characterized in that A flow disturbance component (7) is provided on the opposite end faces of the moving ring block (503) and the stationary ring block (4); when the flow disturbance component (7) is in an extended state, the moving ring block (503) rotates, and the flow disturbance component (7) disturbs and cleans the abutting end faces of the moving ring block (503) and the stationary ring block (4).

8. The mechanical seal according to claim 7, characterized in that There is a gap area (13) between the end surfaces of the moving ring block (503) and the static ring block (4) that are in contact with each other, for the spoiler component (7) to expand and contract.

9. The mechanical seal according to claim 7, characterized in that The spoiler component (7) comprises: A movable groove (701) is located at the end of the movable ring block (503) and has a slidable movable blade (702) therein; A pulling member (703), one end of which is connected to the moving blade (702), and the other end of which is connected to the switching frame (601) corresponding to the moving blade (702) on the other side; The third elastic member (704) has one end connected to the movable blade (702) and the other end connected to the movable groove (701).

10. The mechanical seal according to claim 1, wherein: A pressure sensing element is provided at the connection between the stationary ring block (4) and the mounting flange (3).

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