Spring mechanical seal for large-volume coal slurry pump

Abstract

The utility model relates to mechanical seal technical field discloses spring mechanical seal for big channeling amount coal slurry pump, including shaft sleeve assembly, the shaft sleeve assembly is equipped with on the pump shaft, the shaft sleeve assembly one end surface and the impeller cover end surface abut, be equipped with the gland that can move on the seal on the shaft sleeve assembly, and the gland includes inner gland and outer gland, and the inner gland is connected through the gland screw between the outer gland. The utility model gland can move on the seal, and the seal itself runs well, and only needs to replace the impeller, the end surface has been stable after continuous running itself adhesion and liquid film formation, and will not have the influence because of replacing the impeller, and the position of the rest sealing composition except the gland has no change, complete the replacement of impeller, only need to tighten the gland, can improve the replacement work efficiency of impeller, also will not affect the stable working state of mechanical seal.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically a spring mechanical seal for a large-volume coal slurry pump. Background Technology

[0002] Spring mechanical seals are a sealing technology used in rotating machinery (such as pumps, compressors, and reactors). Their core function is to use the combined pressure of an elastic element (spring) and the sealing medium to maintain a tight seal between the end faces of the rotating and stationary rings, forming an extremely thin liquid film to achieve a seal and prevent leakage of the internal medium or intrusion of external air. my country has abundant coal resources, but coal mining and consumption have caused serious environmental pollution. Therefore, safety and environmental protection must be considered in coal mining operations, which aligns with the development direction of new industrialization.

[0003] Centrifugal coal slurry pumps are widely used in coal slurry pumping. However, the large number of particles in coal slurry causes significant wear on the sealing components, and the lack of comprehensive seal protection measures necessitates frequent replacements. Similarly, the pump impeller also requires frequent replacements during coal slurry agitation. Traditional seal placement has relatively fixed requirements, necessitating adjustments to the impeller's fit, which consumes considerable time. Improper adjustment of the positioning dimensions of traditional mechanical seals can affect the operational performance of the sealing face. Incorrect positioning can lead to two scenarios: First, the shaft sleeve may be positioned further away from the impeller than in the original, uninstalled manifold seal (i.e., installation position deviation, shaft sleeve shifting towards the atmosphere). In this case, the spring pressure at the sealing face increases, resulting in poor liquid film formation between the face and accelerating wear, thus affecting seal life. Second, the shaft sleeve may be positioned closer to the impeller than in the original, uninstalled manifold seal (i.e., installation position deviation, shaft sleeve shifting towards the medium). In this case, the spring pressure at the sealing face decreases, leading to poor fit and tracking, causing seal leakage.

[0004] To address the aforementioned issues, we propose a spring mechanical seal for high-volume coal slurry pumps. Utility Model Content

[0005] The purpose of this invention is to provide a spring mechanical seal for a large-volume coal slurry pump, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a spring mechanical seal for a large-volume coal slurry pump, comprising a bushing assembly; the bushing assembly is sleeved on the pump shaft; one end face of the bushing assembly abuts against the end face of the impeller sleeve; the bushing assembly is provided with a pressure cover that can move on the seal; the pressure cover includes an inner pressure cover and an outer pressure cover; the inner pressure cover and the outer pressure cover are connected by pressure cover screws.

[0007] Preferably, a stationary ring seat assembly is fitted at the center of the outer circumference of the bushing assembly; the stationary ring seat assembly includes two stationary ring seat assemblies and a stationary ring seat anti-rotation pin; the two stationary ring seat assemblies are connected by the anti-rotation pin; one end face of the stationary ring seat assembly is connected to the end face of a stationary ring; the other end face of the stationary ring abuts against the moving ring.

[0008] Preferably, the bushing assembly includes a bushing, a fixed sleeve, a snap ring, a medium-side moving ring seat, a moving ring seat anti-rotation pin, and a moving ring seat mating static seal ring; the surface of the bushing that abuts against the impeller sleeve is provided with an impeller sleeve seal ring; the end face of the bushing away from the impeller sleeve is provided with a fixed pressure plate seal ring; the contact surface between the bushing and the pump shaft is provided with a pump shaft seal ring; the bushing is connected to the medium-side moving ring seat through the fixed sleeve; the fixed sleeve is provided with the snap ring for fixing; the medium-side moving ring seat is connected to the bushing through the moving ring seat anti-rotation pin; the medium-side moving ring seat is provided with a flange; the inner side of the flange of the medium-side moving ring seat abuts against the outer side of the moving ring; a groove seal ring is provided between the inner side of the flange of the medium-side moving ring seat and the moving ring.

[0009] Preferably, the stationary ring seat assembly includes a stationary ring seat, a sector-shaped baffle, a sector-shaped baffle fixing pin, and a stationary ring seat anti-rotation pin; The inner circumference of the stationary ring seat is connected to the fan-shaped baffle; one end face of the stationary ring seat is connected to the fan-shaped baffle through the fan-shaped baffle fixing pin; the other end face of the stationary ring seat is provided with a flange; the stationary ring is connected to the flange of the stationary ring seat through the stationary ring seat anti-rotation pin.

[0010] Preferably, a transmission assembly is fitted onto the bushing assembly; the transmission assembly includes a fluid-isolating side moving ring seat, a transmission seat, an adjusting block, a transmission anti-rotation pin, a transmission snap ring, a first fluid-isolating seal ring, a second fluid-isolating seal ring, and a compensation element; One of the moving rings is connected to the isolating liquid-side moving ring seat via an anti-rotation pin on the isolating liquid side; the other moving ring is connected to the medium-side moving ring seat via the anti-rotation pin on the moving ring seat; an adjusting block is provided between the isolating liquid-side moving ring seat and the bushing assembly; a first isolating liquid sealing ring is provided on the abutting surface of the adjusting block and the bushing assembly; a second isolating liquid sealing ring is provided on the abutting surface of the adjusting block and the isolating liquid-side moving ring seat; a transmission seat is sleeved on the bushing assembly; the transmission seat is connected to the isolating liquid-side moving ring seat via a transmission anti-rotation pin; the transmission seat has a flange; a transmission snap ring is provided on the inner side of the transmission seat flange near the end face; the outer circumference of the transmission seat is tightly fitted to the bushing assembly by a fastening screw. A compensation element is connected between one end face of the isolating liquid-side moving ring seat and the flange side end face of the transmission seat.

[0011] Preferably, the pressure cap assembly further includes a dustproof pad, an inner pressure cap sliding joint sealing ring, an outer pressure cap sliding joint sealing ring, an outer pressure cap static sealing ring, and an inner pressure cap static sealing ring; the dustproof pad is provided on the outer end face of the inner pressure cap near one of the static ring seat assemblies; the inner pressure cap sliding joint sealing ring is provided on the side of the inner pressure cap abutting against one of the static ring seat assemblies; the outer pressure cap sliding joint sealing ring is provided on the side of the outer pressure cap abutting against the other static ring seat assembly; the outer pressure cap static sealing ring is provided between the inner pressure cap and the outer pressure cap; the inner pressure cap static sealing ring is connected to the end face of the inner pressure cap near the outer circumferential side.

[0012] Preferably, the outer circumference of the stationary ring seat assembly is provided with a wear-resistant spray coating.

[0013] Compared with the prior art, the beneficial effects of this utility model are: Easy impeller replacement: The sliding gland design ensures that the sealing end face fit and liquid film are not affected when replacing the impeller. Simply tighten the gland to improve replacement efficiency and do not affect the sealing operation.

[0014] Improve seal service life: The fan-shaped baffle embedded in the stationary ring seat directs the flow, and the vertical groove of the shaft sleeve stirs the isolation liquid, increasing the flow rate, better removing the frictional heat of the end face, improving the stability of the liquid film on the end face, coping with the variable pump shaft speed, and ensuring circulation effect.

[0015] To prevent the failure of the compensation element: The compensation element is external and does not come into contact with the medium, which prevents coal slurry particles from clogging the elastic element and causing the seal to fail, and makes the overall seal structure compact.

[0016] Double protection for the compensation element: The adjusting block is equipped with a double-layer isolation fluid sealing ring to provide protection for the compensation element.

[0017] Adjustable axial position: The adjusting block can adjust the axial position of the entire seal, excluding the pressure cover, when there is a positioning deviation between the bushing and the pump shaft shoulder.

[0018] Multi-layer sealing protection is formed: the medium side has a dustproof pad and multiple sealing rings to form multi-layer protection, and the outer circle of the sliding part of the stationary ring seat assembly is coated with a sprayed layer. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of the structure of this utility model; Figure 2 This is a schematic cross-sectional view of the bushing assembly of this utility model; Figure 3 This is a right-side view of the structure of the stationary ring seat assembly in this utility model; Figure 4 for Figure 3 Cross-sectional view at point BB.

[0020] In the diagram: 1-Shaft sleeve assembly, 2-Impeller sleeve seal ring, 3-Fixed pressure plate seal ring, 4-Pump shaft seal ring, 5-Inner pressure cover, 6-Outer pressure cover, 7-Dustproof pad, 8-Inner pressure cover sliding joint seal ring, 9-Outer pressure cover sliding joint seal ring, 10-Outer pressure cover static seal ring, 11-Inner pressure cover static seal ring, 12-Pressure cover screw, 13-Dynamic ring, 14-Static ring, 15-Isolation fluid side dynamic ring seat, 16-Static ring seat assembly, 17-Static ring seat anti-rotation pin, 18-Slotted seal ring, 19-Isolation fluid 20-Anti-rotation pin for side moving ring seat, 21-Transmission seat, 22-Adjusting block, 23-Anti-rotation pin for transmission, 24-Snap ring for transmission, 25-First isolation fluid seal ring, 26-Second isolation fluid seal ring, 27-Compensating element, 28-Clamping screw, 29-Shaft sleeve, 30-Fixing sleeve, 31-Snap ring, 32-Media side moving ring seat, 33-Anti-rotation pin for moving ring seat, 34-Moving ring seat mating with static seal ring, 35-Static ring seat, 36-Fan-shaped baffle, 37-Fan-shaped baffle fixing pin. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 This utility model provides a technical solution: a spring mechanical seal for a large-volume coal slurry pump, including a bushing assembly 1.

[0023] Figure 1 In the diagram, 'a' represents the medium zone and 'b' represents the isolation fluid zone. The medium zone is a sealed medium, mainly composed of coal slurry (containing particles), while the medium in the isolation fluid zone is demineralized water.

[0024] Figure 2 In the process, the bushing assembly 1 includes a bushing 29, a fixed sleeve 30, a snap ring 31, a medium-side moving ring seat 32, a moving ring seat anti-rotation pin 33, and a moving ring seat mating static sealing ring 34; the surface of the bushing 29 that abuts against the impeller sleeve is provided with an impeller sleeve sealing ring 2; the end face of the bushing 29 away from the impeller sleeve is provided with a fixed pressure plate sealing ring 3; the contact surface between the bushing 29 and the pump shaft is provided with a pump shaft sealing ring 4; the bushing 29 is connected to the medium-side moving ring seat 32 through the fixed sleeve 30; the fixed sleeve 30 is provided with the snap ring 31 for fixing; the medium-side moving ring seat 32 is connected to the bushing 29 through the moving ring seat anti-rotation pin 33.

[0025] The bushing 29 and the medium-side moving ring seat 32 are joined by a flat-mouth type and rotate synchronously with the pump shaft. The fixing sleeve 30 fixes the bushing 29 and the medium-side moving ring seat 32 and is positioned by the snap ring 31 to prevent the medium-side moving ring seat 32 from axially moving within the bushing 29. The gap between the bushing 29 and the medium-side moving ring seat 32 is achieved by the moving ring seat and the static sealing ring 34 to statically seal the conveyed medium, preventing the conveyed medium, i.e., coal slurry, from flowing into the pump shaft. Figure 1 Leakage in the middle b direction.

[0026] The rotating ring seat anti-rotation pin 33 is disposed on the bushing 29 to fix the rotating ring 13. The groove sealing ring 18 is disposed in the groove of the medium-side rotating ring seat 32, forming a medium-side dynamic sealing assembly. The bushing assembly 1 is configured with the impeller sleeve sealing ring 2, and the abutment point of the bushing assembly 1 and the impeller sleeve serves as a sealing point to prevent medium leakage from the pump shaft, forming the first layer of protection. The bushing assembly 1 is configured with the pump shaft sealing ring 4, serving as the second layer of protection to prevent medium leakage from the pump shaft. The bushing assembly 1 is configured with the fixed pressure plate sealing ring 3, serving as the third layer of protection to prevent medium leakage from the pump shaft.

[0027] Figure 1 As shown, one of the stationary rings 14 is disposed on the medium-side stationary ring seat assembly 16 and abuts against the end face of one of the moving rings 13, forming a medium-side end face sealing configuration.

[0028] The overall design concept is an outflow-type balanced sealing end face parameter, and the overall end face configuration is resistant to [various factors]. Figure 1 The pressure in the b-direction, which is the pressure on the isolation fluid side. Figure 1 If a leak occurs at the end face in the a direction, which is the end face on the medium side, the sealing fluid in the b direction will leak from the b direction to the a direction due to the higher pressure on the isolation fluid side than on the medium side. In other words, the sealing fluid on the isolation fluid side will leak from the medium side to the medium side, thereby protecting the overall sealing structure and preventing the coal slurry on the medium side from leaking into the atmosphere, thus providing protection, safety and environmental protection.

[0029] A stationary ring seat assembly is fitted at the center of the outer circumference of the bushing assembly 1; the stationary ring seat assembly includes two stationary ring seat assemblies 16 and an anti-rotation pin 20. The two stationary ring seat assemblies 16 are fixed in relative position by the anti-rotation pin 20. The end face of the stationary ring seat assembly 16 is connected to the end face of a stationary ring 14, and the other end face of the stationary ring 14 abuts against the moving ring 13.

[0030] The stationary ring seat assembly 16 includes a stationary ring seat 35, a sector-shaped baffle 36, a sector-shaped baffle fixing pin 37, and a stationary ring seat anti-rotation pin 17. The inner circumference of the stationary ring seat 35 is connected to the fan-shaped baffle 36; one end face of the stationary ring seat 35 is connected to the fan-shaped baffle 36 through the fan-shaped baffle fixing pin 37; the other end face of the stationary ring seat 35 is provided with a flange; the stationary ring 14 is connected to the flange of the stationary ring seat 35 through the stationary ring seat anti-rotation pin 38.

[0031] Figure 4 In the diagram, the fan-shaped baffle 36, viewed from above, is fan-shaped overall and is fixed to the stationary ring seat 35 by the fan-shaped baffle fixing pin 37. For example... Figure 3 As shown, the inner circumference of the stationary ring seat assembly 16 has a port c near the fan-shaped baffle 36, which is the inlet groove for the isolation liquid medium. The inner circumference of the stationary ring seat assembly 16 also has a port d near the fan-shaped baffle 36, which is the outlet groove for the isolation liquid medium. Opposite to port d, the inner circumference of the stationary ring seat assembly 16 has a port e, which is the outlet groove for the isolation liquid medium. When the pump stops working, port e can be used to discharge the isolation liquid medium from the seal. During pump operation, a threaded plug on the gland provides a seal. A threaded plug, also called a plug or pipe plug, is a tapered or cylindrical plug with external threads. It is connected to a threaded hole (such as a process hole, test hole, or balance hole on a mechanical seal) to seal the hole. Threaded plugs are existing technology and will not be described in detail.

[0032] Depend on Figure 2 As shown, the outer circumferential surface of the bushing 29 is provided with a vertical groove, i.e. Figure 2 Position of the middle dashed line.

[0033] The operating speed of a coal slurry pump is a variable, not a fixed speed, depending on the solid content in the coal slurry. For external flow double-end mechanical seals, the flow rate of the seal is mainly increased by the grooved stirring medium on the shaft sleeve. This method only increases the flow rate and cannot completely remove the frictional heat generated by the end face during operation.

[0034] Therefore, this utility model adds the fan-shaped baffle 36 embedded in the stationary ring seat 35 for directional flow guidance, and cooperates with the vertical groove of the bushing 29 to stir the isolation liquid. This improvement method can increase the flow of isolation liquid. At the same time, because the head of the fan-shaped baffle 36 is close to the end face, the guiding medium can better remove the frictional heat generated during the end face operation, and the stability of the liquid film on the end face is improved, ensuring the service life of the seal.

[0035] The sealing working fluid medium enters from port c and is guided to the end faces on both sides of the device by the fan-shaped baffle 36. This carries away the frictional heat generated during the operation of the sealing end face. Combined with the vertical grooves on the bushing 29 rotating with the pump shaft, the fluid medium is agitated and guided through the fan-shaped baffle 36 to port d, carrying the fluid medium into the auxiliary system for cooling. This process is repeated to ensure that the sealing rotation temperature does not become too high, leading to seal failure. Since the sealing medium is coal slurry containing particles, the pump shaft rotation speed varies depending on the coal slurry content. In this case, the agitation of the fluid by the vertical grooves on the bushing, combined with the guiding effect of the fan-shaped baffle 36, increases the efficiency of pumping the fluid medium, thus addressing the variable pump shaft speed, ensuring the circulation of the fluid medium, and guaranteeing and extending the service life of the seal.

[0036] The stationary ring 14 is mounted on the stationary ring seat assembly 16 and abuts against the end face of the rotating ring 13, forming a sealing configuration on the liquid-side end face. The overall design concept is an outflow-type balanced sealing end face parameter, and the overall end face configuration can withstand the pressure from the liquid-side. The parameters of the medium-side end face configuration are the same as those of the liquid-side end face configuration, which can mutually cancel out the axial force generated by the pressure applied by the liquid-side, ensuring the stability of the sealing structure.

[0037] The bushing assembly 1 is fitted with a transmission assembly; the transmission assembly includes a fluid-side moving ring seat 15, a transmission seat 21, an adjusting block 22, a transmission anti-rotation pin 23, a transmission snap ring 24, a first fluid-side sealing ring 25, a second fluid-side sealing ring 26, and a compensation element 27, which cooperate with the end face of the moving ring 13 and the groove sealing ring 18, and then form a fluid-side end face configuration with the stationary ring 14 on the fluid-side and the groove sealing ring 18.

[0038] In cases where the medium-side end face is severely damaged or fails, some coal slurry containing particles will inevitably enter the isolation liquid side. The external placement of the spring prevents the coal slurry particles from clogging the spring, thus preventing the spring from compensating for the lack of contact with the sealing end face and causing seal failure. Therefore, the compensation element 27 in this invention adopts an external spring arrangement to ensure it does not come into contact with the medium. Because the medium side contains a large amount of coal slurry containing particles, the compensation element 27 is externally placed on the isolation liquid side to avoid contact with the medium.

[0039] The design of not arranging the compensation element 27 on the medium side prevents particles in the coal slurry from clogging the elastic element, causing the sealing end face to fail to compensate and resulting in sealing failure. At the same time, because less compensation element 27 is arranged on one side, the overall sealing structure is compact.

[0040] Similarly, the first isolation fluid sealing ring 25 and the second isolation fluid sealing ring 26 configured on the adjustment block 22 also have the above-mentioned effect, providing double-layer protection for the spring.

[0041] Furthermore, the adjusting block 22 can also adjust the axial position of the entire seal, excluding the pressure cap, when there is a deviation in the positioning of the bushing 29 and the pump shaft shoulder. The adjustable axial dimension can reach 3mm. The isolation liquid-side moving ring seat 15 and the adjusting block 22 are integrated under the transmission seat 21 and the transmission part retaining spring 24. The outer circle of the isolation liquid-side moving ring seat 15 is designed to be arc-shaped, which reduces the possible contact area when it fits in the transmission seat 21, and is centered by the transmission part anti-rotation pin 23, eliminating the risk of jamming of the compensation element 27.

[0042] The pressure cap includes an inner pressure cap 5, an outer pressure cap 6, a dustproof pad 7, a sealing ring 8 for the sliding part of the inner pressure cap, a sealing ring 9 for the sliding part of the outer pressure cap, a static sealing ring 10 for the outer pressure cap, and a static sealing ring 11 for the inner pressure cap. The inner pressure cap 5 and the outer pressure cap 6 are connected by pressure cap screws 12. The outer pressure cap 6 has an arc-shaped groove in its inner hole to accommodate the anti-rotation pin 20, which ensures that it can slide on the two static ring seat assemblies 16, and the sliding distance can reach 18mm.

[0043] The most significant feature of this invention is that the gland can move freely within the seal. In coal slurry mixing, impeller damage is severe, often requiring replacement even when the mechanical seal is functioning well. Compared to existing technologies, the fixed-position mechanical seal bushing and gland's cartridge seal only requires the bushing 29 to be fixed to the pump shaft shoulder. After the pump shaft and impeller are installed, their relative positions do not need adjustment, and the gland's movement is sufficient to ensure proper seal installation and operation.

[0044] This invention ensures that the seal itself is functioning well. Only the impeller needs to be replaced. The end face has stabilized through continuous operation and liquid film formation, and will not be affected by the impeller replacement. This is because the positions of the other sealing components, except for the gland, remain unchanged. After replacing the impeller, only the gland needs to be tightened. This improves the efficiency of impeller replacement and does not affect the stable working state of the mechanical seal.

[0045] The dustproof pad 7 on the medium side prevents coal slurry from leaking to the isolation liquid side, forming a multi-layer protection with multiple sealing ring structures.

[0046] The grooves for installing each sealing ring in the inner pressure cover 5 all adopt a dovetail groove design to ensure that each sealing ring is firmly installed. The dustproof pad 7 and the stationary ring seat assembly 16 are also designed with a dovetail groove. This design can better protect the overall seal and prevent coal slurry medium from entering the isolation liquid. Together with the inner pressure cover sliding seal ring 8, a double seal protection is formed. In addition, the outer pressure cover sliding seal ring 9 can prevent the medium from leaking into the atmosphere, forming a total of three layers of protection. The outer circle of the sliding part of the two stationary ring seat assemblies 16 is coated with a sprayed coating to increase the wear resistance of the sliding part. It can slide 18mm with the overall pressure cover to ensure service life.

[0047] The inner pressure cover 5 and the outer pressure cover 6 are provided with the outer pressure cover static sealing ring 10, and the inner pressure cover 5 is connected to the inner pressure cover static sealing ring 11 near the outer circumference of the end face.

[0048] This utility model is applicable to the following working conditions: Average linear velocity at the end face: less than or equal to 25 m / s; Shaft diameter: less than or equal to 100 mm; The temperature of the conveying medium is less than or equal to 150℃; Conveying medium: coal slurry (containing particles), with a solid content of up to 50%~60%.

[0049] It should be noted that when using No. 10 industrial white oil as the isolation fluid medium at a pump speed of 2150 rpm and a pressure of 0.5 MPa, without the embedded fan-shaped flow guide, the flow meter reading remained stable at approximately 3.3 L / min during operation verification with the PLAN53B auxiliary system. With the embedded fan-shaped flow guide added, the flow meter reading reached approximately 5.2 L / min. The data demonstrates that the embedded fan-shaped flow guide has a significant effect.

[0050] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A spring mechanical seal for a high-capacity coal slurry pump, characterized in that, Includes a bushing assembly (1); the bushing assembly (1) is fitted onto the pump shaft; one end face of the bushing assembly (1) abuts against the end face of the impeller sleeve; the bushing assembly (1) is provided with a pressure cover that can move on the seal; the pressure cover includes an inner pressure cover (5) and an outer pressure cover (6); the inner pressure cover (5) and the outer pressure cover (6) are connected by pressure cover screws (12).

2. The spring mechanical seal for a high-volume coal slurry pump according to claim 1, characterized in that, A stationary ring seat assembly is fitted at the center of the outer circumference of the bushing assembly (1); the stationary ring seat assembly includes two stationary ring seat assemblies (16) and an anti-rotation pin (20); the two stationary ring seat assemblies (16) are connected by the anti-rotation pin (20); the end face of the stationary ring seat assembly (16) is connected to the end face of a stationary ring (14); the other end face of the stationary ring (14) abuts against the moving ring (13).

3. The spring mechanical seal for a high-volume coal slurry pump according to claim 2, characterized in that, The bushing assembly (1) includes a bushing (29), a fixed sleeve (30), a snap ring (31), a medium-side moving ring seat (32), a moving ring seat anti-rotation pin (33), and a moving ring seat mating static seal ring (34); the surface of the bushing (29) that abuts against the impeller sleeve is provided with an impeller sleeve seal ring (2); a fixed pressure plate seal ring (3) is provided on the end face of the bushing (29) away from the impeller sleeve; a pump shaft seal ring (4) is provided on the contact surface between the bushing (29) and the pump shaft; the bushing (29) passes through the fixed sleeve ( 30) Connected to the medium-side moving ring seat (32); the fixed sleeve (30) is provided with the snap ring (31) for fixing; the bushing (29) is connected to the medium-side moving ring seat (32) through the moving ring seat anti-rotation pin (33); the medium-side moving ring seat (32) is provided with a flange; the inner side of the flange of the medium-side moving ring seat (32) abuts against the outer side of the moving ring (13); a groove sealing ring (18) is provided between the inner side of the flange of the medium-side moving ring seat (32) and the moving ring (13).

4. The spring mechanical seal for a high-volume coal slurry pump according to claim 2, characterized in that, The stationary ring seat assembly (16) includes a stationary ring seat (35), a sector-shaped baffle (36), a sector-shaped baffle fixing pin (37), and a stationary ring seat anti-rotation pin (17). The inner circumference of the stationary ring seat (35) is connected to the fan-shaped baffle (36); one end face of the stationary ring seat (35) is connected to the fan-shaped baffle (36) through the fan-shaped baffle fixing pin (37); the other end face of the stationary ring seat (35) is provided with a flange; the stationary ring (14) is connected inside the flange of the stationary ring seat (35) through the stationary ring seat anti-rotation pin (17).

5. The spring mechanical seal for a high-volume coal slurry pump according to claim 3, characterized in that, The bushing assembly (1) is fitted with a transmission assembly; the transmission assembly includes a fluid-isolating side moving ring seat (15), a transmission seat (21), an adjusting block (22), a transmission anti-rotation pin (23), a transmission snap ring (24), a first fluid-isolating seal ring (25), a second fluid-isolating seal ring (26), and a compensation element (27). One of the moving rings (13) is connected to the isolation liquid-side moving ring seat (15) via an anti-rotation pin (19) on the isolation liquid side; the other moving ring (13) is connected to the medium-side moving ring seat (32) via an anti-rotation pin (33) on the moving ring seat; an adjusting block (22) is provided between the isolation liquid-side moving ring seat (15) and the bushing assembly (1); a first isolation liquid sealing ring (25) is provided on the abutting surface of the adjusting block (22) and the bushing assembly (1); a second isolation liquid sealing ring is provided on the abutting surface of the adjusting block (22) and the isolation liquid-side moving ring seat (15). The transmission seat (21) is fitted onto the bushing assembly (1); the transmission seat (21) is connected to the isolation liquid side moving ring seat (15) via a transmission anti-rotation pin (23); the transmission seat (21) is provided with a flange; the transmission seat (21) is provided with a transmission snap ring (24) near the end face on the inner side of the flange; the outer circumference of the transmission seat (21) is tightly fitted to the bushing assembly (1) by a fastening screw (28); the compensation element (27) is connected between one end face of the isolation liquid side moving ring seat (15) and the flange side end face of the transmission seat (21).

6. The spring mechanical seal for a high-volume coal slurry pump according to claim 2, characterized in that, The pressure cap assembly also includes a dustproof pad (7), an inner pressure cap sliding seal (8), an outer pressure cap sliding seal (9), an outer pressure cap static seal (10), and an inner pressure cap static seal (11); the dustproof pad (7) is provided on the outer end face of the inner pressure cap (5) near one of the static ring seat assemblies (16); the inner pressure cap sliding seal (8) is provided on the side of the inner pressure cap (5) that abuts against one of the static ring seat assemblies (16); the outer pressure cap sliding seal (9) is provided on the side of the outer pressure cap (6) that abuts against the other static ring seat assembly (16); the outer pressure cap static seal (10) is provided between the inner pressure cap (5) and the outer pressure cap (6); the inner pressure cap static seal (11) is connected to the end face of the inner pressure cap (5) near the outer circumference.

7. The spring mechanical seal for a high-volume coal slurry pump according to claim 3, characterized in that, The outer circle of the stationary ring seat assembly (16) is provided with a wear-resistant spray coating.

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