Water retaining device for stuffing box of centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a centrifugal pump stuffing box water retaining device which comprises a water retaining cylinder. Extension cylinders are slidably mounted on the outer rings of the two ends of the water retaining cylinder. A sealing ring piece is arranged between the extension cylinder and the water retaining cylinder; one end, far away from the water retaining cylinder, of the extension cylinder is fixedly connected with a fixed ring plate; a plurality of sleeved sealing rings are arranged on the face, away from the extending cylinder, of the fixing ring plate. A rotating shaft between a motor and a pump body of the centrifugal pump is surrounded and isolated by the water retaining cylinder, the extension cylinder and the fixed ring plate, and meanwhile, the sealing ring sheet and the sealing ring are used for further sealing, so that gushing water is effectively prevented from entering a stuffing box of the centrifugal pump, the gushing water and carried silt and pulverized coal are prevented from entering a bearing chamber, and the service life of the bearing chamber is prolonged. The deterioration condition of the lubricating grease is avoided, and the abrasion of silt and pulverized coal to the bearing is avoided; and therefore, normal operation of the centrifugal pump is ensured, and the equipment maintenance cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, specifically a centrifugal pump stuffing box water-blocking device. Background Technology

[0002] Because coal mining goes deep underground, groundwater and surface water enter the mining space through geological structures (such as rock fissures, faults, boreholes, etc.), forming water inrushes. Water inrushes will continue throughout the entire coal mining process, and centrifugal pumps are needed to drain the water.

[0003] A search revealed a patent application with application number 201720040381.5, which discloses a mine centrifugal pump underground drainage system. The system includes a motor, a motor control switch, and a centrifugal pump. The motor's main shaft is connected to the centrifugal pump's shaft via a coupling. The centrifugal pump's inlet is connected to an inlet pipe with a foot valve at the inlet end. The centrifugal pump's outlet is connected to a drainage pipe. Along the water flow direction, the drainage pipe is sequentially equipped with a pressure gauge, a drainage solenoid valve, and a check valve. The drainage pipe also connects to an emptying pipe and a static pressure water pipe. The connection between the emptying pipe and the drainage pipe is located behind the check valve, with the flow direction being front-to-back. The emptying pipe is equipped with an emptying solenoid valve. The connection between the static pressure water pipe and the drainage pipe is located before the drainage solenoid valve. This drainage system can efficiently pump out the gushing water from the mine.

[0004] However, in actual use in coal mines, the inflow water contains a large amount of mud and coal dust, and the gap between the stuffing box water baffle ring and the shaft of the centrifugal pump is too large. As a result, when the centrifugal pump is draining water underground, the inflow water carrying mud and coal dust will enter the bearing chamber through the cover gap, causing the grease inside the bearing chamber to deteriorate, thus reducing the lubrication effect. At the same time, the mud and coal dust will also obstruct the rotation of the bearing, aggravating the wear of the bearing.

[0005] Therefore, a centrifugal pump stuffing box water-blocking device is proposed to address the above problems. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: The centrifugal pump stuffing box water-blocking device of this utility model includes a water-blocking cylinder; an extension cylinder is slidably installed on the outer ring of both ends of the water-blocking cylinder; a sealing ring is provided between the extension cylinder and the water-blocking cylinder; the two ends of the sealing ring are fixedly connected to the outer wall of the water-blocking cylinder and the inner wall of the extension cylinder, respectively; a fixing ring plate is fixedly connected to the end of the extension cylinder away from the water-blocking cylinder; a plurality of sleeved sealing rings are provided on the side of the fixing ring plate away from the extension cylinder.

[0008] Preferably, a plurality of fixed seats are bolted around the outer ring of the middle part of the water-blocking cylinder; a sliding cylinder is fixedly connected to the middle part of the fixed seat; a lead screw is slidably installed inside both ends of the sliding cylinder; an adjusting nut that is threadedly engaged with the lead screw is rotatably installed at both ends of the sliding cylinder; and a connecting plate is fixedly connected to the end of the lead screw away from the fixed seat.

[0009] Preferably, the outer ring of the middle part of the water-blocking cylinder has multiple threaded through holes; a sealing cylinder cover is installed inside the threaded through holes; a drying tube is installed inside the bottom inner ring of the sealing cylinder cover; and the drying tube is filled with water-absorbing silica gel particles.

[0010] Preferably, a water-absorbing silicone ring is provided on the outer wall of the sealing ring.

[0011] Preferably, a drain pipe is provided at the bottom of one end of the extension cylinder near the fixed ring plate; a valve is provided at the top of the drain pipe.

[0012] Preferably, the inner wall of the drain outlet of the drain pipe is provided with a cylindrical body; a mounting bracket is fixedly connected to the inside of the cylindrical body near the drain pipe; a one-way diaphragm is bolted to the middle of the side of the mounting bracket away from the drain pipe.

[0013] Preferably, the drain pipe is a tee pipe; the inside of the drain pipe is also provided with a cylinder and a one-way diaphragm; a sealing cap is threadedly installed at the bottom opening of the drain pipe; a push rod is slidably installed in the middle of the sealing cap; and a piston head that can slide inside the drain pipe is fixedly connected to the top of the push rod.

[0014] The advantages of this utility model are:

[0015] 1. The centrifugal pump stuffing box water-blocking device of this utility model, by setting up a water-blocking cylinder, an extension cylinder, a sealing ring, a fixing ring plate, and a sealing ring; the water-blocking cylinder, the extension cylinder, and the fixing ring plate surround and isolate the rotating shaft between the motor and the pump body of the centrifugal pump. At the same time, the sealing ring and the sealing ring further seal the structure, thereby effectively preventing water from entering the stuffing box of the centrifugal pump, thus preventing the water and the mud and coal dust it carries from entering the bearing chamber, avoiding the deterioration of the lubricating grease, and preventing the wear of the bearing by mud and coal dust; thereby ensuring the normal operation of the centrifugal pump and saving equipment maintenance costs.

[0016] 2. The centrifugal pump stuffing box water-blocking device of this utility model is provided by setting a fixed seat, a sliding cylinder, a lead screw, an adjusting nut and a connecting plate; the connecting plate is fixed to the fixed ring plate, and the lead screw is driven by the adjusting nut to slide out from the sliding cylinder, pushing the fixed ring plate to firmly press against the motor and pump body of the centrifugal pump; thereby avoiding the need to open screw holes in the motor and pump body of the centrifugal pump, thus facilitating the installation and disassembly work of the workers, and at the same time avoiding damage to the centrifugal pump. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is an exploded structural diagram of one end of the water-blocking cylinder in this utility model;

[0021] Figure 4 This is a partial sectional view of the fixing ring plate in this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the fixed base and the sliding cylinder in this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the sealing cylinder cover and the drying tube in this utility model;

[0024] Figure 7 This is a schematic diagram of the drainage pipe in this utility model;

[0025] Figure 8 This is an exploded structural diagram of the drainage pipe in this utility model;

[0026] Figure 9 This is a cross-sectional view of the drainage pipe in this utility model.

[0027] Figure 10 This is a schematic diagram of the structure of the cylinder and the unidirectional diaphragm in this utility model.

[0028] In the diagram: 1. Water-blocking cylinder; 2. Extension cylinder; 3. Sealing ring; 4. Fixing ring plate; 5. Sealing ring; 6. Fixing seat; 7. Slide cylinder; 8. Lead screw; 9. Adjusting nut; 10. Connecting plate; 11. Sealing cylinder cover; 12. Drying tube; 13. Water-absorbing silicone ring; 14. Drain pipe; 15. Cylinder body; 16. One-way diaphragm; 17. Sealing cover; 18. Push rod; 19. Piston head; 20. Internal threaded ring cover; 21. Connecting rod. Detailed Implementation

[0029] 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 scope of protection of the present utility model.

[0030] like Figures 1 to 4 As shown, a centrifugal pump stuffing box water-blocking device includes a water-blocking cylinder 1; extension cylinders 2 are slidably installed on the outer rings of both ends of the water-blocking cylinder 1; a sealing ring 3 is provided between the extension cylinder 2 and the water-blocking cylinder 1; the two ends of the sealing ring 3 are fixedly connected to the outer wall of the water-blocking cylinder 1 and the inner wall of the extension cylinder 2, respectively; a fixing ring plate 4 is fixedly connected to the end of the extension cylinder 2 away from the water-blocking cylinder 1; a plurality of sleeved sealing rings 5 ​​are provided on the side of the fixing ring plate 4 away from the extension cylinder 2.

[0031] In some embodiments, a central convex ring is fixedly connected to the outer ring of the middle part of the baffle cylinder 1, and outer ring flanges are fixedly connected to the outer rings of both ends of the baffle cylinder 1; the baffle cylinder 1 is sleeved on the outer ring of the rotating shaft between the motor and the pump body of the centrifugal pump.

[0032] An inner ring flange is fixed to the inner ring of the extension cylinder 2 near the water baffle cylinder 1, and the outer ring flange of the water baffle cylinder 1 matches the inner ring flange of the extension cylinder 2, so that the extension cylinder 2 slides on the outer ring of the water baffle cylinder 1, and the extension cylinder 2 cannot detach from the water baffle cylinder 1.

[0033] The sealing ring 3 is disposed between the outer flange of the water baffle 1 and the inner flange of the extension cylinder 2, and the two ends of the sealing ring 3 are respectively fixed to the outer flange of the water baffle 1 and the inner flange of the extension cylinder 2; the sealing ring 3 has an inner cavity, which allows the sealing ring 3 to be compressed and stretched.

[0034] The outer ring of the fixed ring plate 4 is provided with multiple screw holes, and the side of the fixed ring plate 4 away from the extension cylinder 2 is provided with multiple sleeved annular grooves, and the sealing ring 5 is snapped into the annular grooves; one side of the fixed ring plate 4 is fixedly installed on the motor of the centrifugal pump by bolts, and the other side of the fixed ring plate 4 is fixedly installed on the pump body of the centrifugal pump by bolts.

[0035] When the fixing ring plates 4 on both sides are fixedly installed onto the motor and pump body of the centrifugal pump using bolts, the fixing ring plates 4 squeeze the sealing ring 5, causing the sealing ring 5 to be compressed and sealing the gap between the fixing ring plates 4 and the motor or pump body of the centrifugal pump; at the same time, the fixing ring plates 4 and the extension cylinder 2 slide away from the water baffle cylinder 1, increasing the length range of the surrounding isolation, thus making it applicable to different centrifugal pumps and improving the applicability of the water baffle device;

[0036] The outer flange of the water-blocking cylinder 1 and the inner flange of the extension cylinder 2 press against the sealing ring 3, causing the sealing ring 3 to compress and increase its thickness, thereby further blocking and sealing the gap between the water-blocking cylinder 1 and the extension cylinder 2.

[0037] The centrifugal pump's motor and pump body shaft are surrounded and isolated by the baffle 1, extension cylinder 2, and fixed ring plate 4. At the same time, the sealing ring 3 and sealing ring 5 further seal the shaft, effectively preventing water from entering the centrifugal pump's stuffing box. This also prevents water and the carried mud, sand, and coal dust from entering the bearing chamber, avoiding grease deterioration and wear on the bearings caused by mud, sand, and coal dust. Consequently, the centrifugal pump operates normally, saving on equipment maintenance costs.

[0038] like Figure 1 , Figure 2 and Figure 5 As shown, a plurality of fixed seats 6 are bolted around the outer ring of the middle part of the water-blocking cylinder 1; a sliding cylinder 7 is fixedly connected to the middle part of the fixed seat 6; a lead screw 8 is slidably installed inside both ends of the sliding cylinder 7; an adjusting nut 9 that is threadedly engaged with the lead screw 8 is rotatably installed at both ends of the sliding cylinder 7; a connecting plate 10 is fixedly connected to the end of the lead screw 8 away from the fixed seat 6.

[0039] In some embodiments, the fixing seat 6 includes a base and a pressure plate; the base is generally convex in shape, and the bottom surface of the base is an arc surface that fits against the outer wall of the middle part of the water-blocking cylinder 1; the top surface of the middle part of the base is a semi-circular concave surface that matches the outer wall of the sliding cylinder 7; through holes are provided on both sides of the base, and the outer ring of the middle convex ring of the water-blocking cylinder 1 is provided with screw holes corresponding to the through holes of the base. A long bolt is inserted through the through hole of the base and screwed into the screw hole of the outer ring of the water-blocking cylinder 1 to fix the base of the fixing seat 6 to the outer ring of the middle part of the water-blocking cylinder 1; the bottom center of the pressure plate of the fixing seat 6 is a semi-circular concave surface that matches the outer wall of the sliding cylinder 7; slots are provided on both sides of the pressure plate and the base of the fixing seat 6, and bolts are provided in the slots; the pressure plate and the base of the fixing seat 6 are fixedly locked by bolts, and the sliding cylinder 7 is fixedly clamped between the pressure plate and the base of the fixing seat 6.

[0040] In practical use, after fitting the baffle cylinder 1, extension cylinder 2, and fixing ring plate 4 onto the outside of the shaft between the motor and pump body of the centrifugal pump, firstly, fix the pair of connecting discs 10 to the fixing ring plates 4 on both sides with screws. Then, rotate the adjusting nuts 9 at both ends of the slide cylinder 7. The rotation of the adjusting nuts 9 drives the lead screw 8 to slide from the inside of the slide cylinder 7, pushing the fixing ring plate 4 away from the baffle cylinder 1, so that the fixing ring plates 4 on both sides press tightly against the motor and pump body of the centrifugal pump. After that, rotate the adjusting nuts 9 at both ends of the other slide cylinders 7 in sequence, so that the lead screw 8 pushes the connecting disc 10 to contact the fixing ring plate 4. Then, use screws to lock the connecting disc 10 to the fixing ring plate 4. The fixing ring plate 4 is firmly pressed onto the motor and pump body of the centrifugal pump. This avoids the need to drill screw holes in the motor and pump body of the centrifugal pump, thus facilitating the installation and disassembly work of the staff, and at the same time, avoiding damage to the centrifugal pump.

[0041] like Figure 1 , Figure 2 and Figure 6 As shown, the water-blocking cylinder 1 has multiple threaded through holes on its outer ring in the middle; a sealing cylinder cover 11 is installed inside the threaded through holes; a drying tube 12 is installed on the bottom inner ring of the sealing cylinder cover 11; and the drying tube 12 is filled with water-absorbing silica gel particles.

[0042] In some embodiments, a threaded through hole is formed on the central convex ring of the water-blocking cylinder 1 and penetrates the inner wall of the water-blocking cylinder 1; the bottom of the sealing cylinder cover 11 is an internally threaded cylinder, and the top is a cover body, and the diameter of the cover body is larger than the diameter of the threaded through hole; the drying tube 12 is a tubular structure and the bottom end is sealed; the top outer ring of the drying tube 12 is threaded so that the drying tube 12 can be threaded onto the bottom inner ring of the sealing cylinder cover 11; the bottom outer ring of the drying tube 12 is surrounded by multiple water-absorbing holes, and the diameter of the water-absorbing holes is smaller than the diameter of the water-absorbing silica gel particles;

[0043] In practical use, the absorbent silica gel granules are filled into the drying tube 12, filling it to one-half to two-thirds full. This provides sufficient space for the silica gel granules to expand after absorbing water, thus preventing them from being squeezed out of the absorption holes. The drying tube 12 is then threaded onto the bottom inner ring of the sealing cap 11. Finally, the drying tube 12 is inserted into the water-blocking cylinder 1 through the threaded through hole, and the sealing cap 11 is rotated to install itself into the threaded through hole.

[0044] The water-absorbing silica gel particles inside the drying tube 12 absorb the moisture inside the water-blocking cylinder 1, thereby ensuring the dryness of the inside of the water-blocking cylinder 1 and reducing the probability of the lubricating grease deteriorating when it comes into contact with water.

[0045] like Figures 3 to 4 As shown, a water-absorbing silicone ring 13 is provided on the outer wall of the sealing ring 5;

[0046] Furthermore, an annular groove is provided on the side of the sealing ring 5 away from the water baffle 1, and the water-absorbing silicone ring 13 is bonded in the annular groove; through the water-absorbing silicone ring 13, the water entering the gap between the fixed ring plate 4 and the motor or pump body of the centrifugal pump is absorbed, thereby preventing external water from entering the interior of the water baffle 1, and further ensuring the dryness of the interior of the water baffle 1.

[0047] like Figure 2 and Figure 7 As shown, a drain pipe 14 is provided at the bottom of one end of the extension cylinder 2 near the fixed ring plate 4; a valve is provided at the top of the drain pipe 14;

[0048] In some embodiments, a drain outlet is provided at the bottom of one end of the extension tube 2 near the fixed ring plate 4, and the drain pipe 14 is fixedly installed at the bottom of the drain outlet by a flange;

[0049] In practical use, when water enters the interior of the baffle cylinder 1, the water will accumulate at the bottom of the extension cylinder 2 because the bottom of the inner ring of the extension cylinder 2 is located below the bottom of the baffle cylinder 1. At this time, the valve on the drain pipe 14 is opened to discharge the accumulated water through the drain pipe 14, thereby facilitating the discharge of water from the interior of the extension cylinder 2, reducing the harm of water entering the stuffing box, and thus ensuring the normal operation of the centrifugal pump.

[0050] like Figures 7 to 10 As shown, a cylindrical body 15 is provided on the inner wall of the drain outlet of the drain pipe 14; a mounting bracket is fixedly connected to the inside of the cylindrical body 15 near the drain pipe 14; a one-way diaphragm 16 is bolted to the middle of the side of the mounting bracket away from the drain pipe 14.

[0051] Furthermore, the mounting frame is a radial frame, and the outer ring is provided with a ring that is fixed to the inner wall of the cylinder 15; the one-way diaphragm 16 has a hole in the middle for fixed installation, and the one-way diaphragm 16 can completely cover and shield the mounting frame.

[0052] In practical use, when the water at the bottom of the water-blocking cylinder 1 is discharged along the drain pipe 14, the water will push the one-way diaphragm 16 to bend outwards towards the drain pipe 14, exposing the mounting bracket of the cylinder 15, so that the water can be discharged smoothly; when the external water surges past the drain pipe 14, the external water surges will press the one-way diaphragm 16 tightly onto the mounting bracket of the cylinder 15, completely blocking and sealing the mounting bracket of the cylinder 15, thereby ensuring that the external water surges cannot enter the extension cylinder 2.

[0053] like Figures 7 to 10As shown, the drain pipe 14 is a three-way pipe; the interior of the drain pipe 14 is also provided with a cylinder 15 and a one-way diaphragm 16; a sealing cap 17 is threadedly installed at the bottom opening of the drain pipe 14; a push rod 18 is slidably installed in the middle of the sealing cap 17; a piston head 19 that can slide inside the drain pipe 14 is fixedly connected to the top of the push rod 18.

[0054] Furthermore, the drain pipe 14 is a tee pipe, and an internal threaded ring cap 20 is fixedly connected to the end of the cylinder 15 at the outlet of the drain pipe 14 away from the drain pipe 14; the outer wall of the drain outlet of the drain pipe 14 is provided with a thread that matches the internal threaded ring cap 20; the internal threaded ring cap 20 is threaded with the drain outlet of the drain pipe 14, thereby facilitating installation and disassembly.

[0055] The arrangement of the cylinder 15 and one-way diaphragm 16 inside the drain pipe 14 is consistent with that at the drain outlet of the drain pipe 14; multiple connecting rods 21 are fixedly connected around the two cylinders 15; the connecting rods 21 facilitate the installation and removal of the cylinder 15 and one-way diaphragm 16 inside the drain pipe 14 by the staff.

[0056] The two cylindrical bodies 15 are located on both sides of the bottom opening of the drain pipe 14, that is, the push rod 18 and the piston head 19 are located between the two cylindrical bodies 15.

[0057] In practical use, the valve on the drain pipe 14 is opened to discharge the accumulated water through the drain pipe 14. Since the one-way diaphragm 16 can only bend outwards towards the drain outlet of the drain pipe 14, the water inside the drain pipe 14 can only flow from the inside of the baffle cylinder 1 towards the drain outlet of the drain pipe 14. At this time, the operator pulls down the push rod 18, causing the piston head 19 to slide downwards, which creates a negative pressure inside the drain pipe 14. This causes the one-way diaphragm 16 on the side closer to the baffle cylinder 1 to bend and open, while the one-way diaphragm 16 on the side farther from the baffle cylinder 1 to close, allowing the accumulated water inside the baffle cylinder 1 to be sucked into the middle of the drain pipe 14. Then, the push rod 18 is pushed upwards to push the piston head 19 to slide upwards, increasing the pressure inside the drain pipe 14. This causes the one-way diaphragm 16 on the side closer to the baffle cylinder 1 to close, while the one-way diaphragm 16 on the side farther from the baffle cylinder 1 to bend and open, pressurizing and discharging the accumulated water in the middle of the drain pipe 14.

[0058] By using two sets of cylinders 15 and one-way diaphragms 16, as well as push rods 18 and piston heads 19, the water inside the water-blocking cylinder 1 is pressurized and discharged in one direction, thereby not only discharging the water but also effectively preventing external water from entering the drain pipe 14; thus further improving the water discharge efficiency.

[0059] Working principle: During installation, one side of the fixing ring plate 4 is bolted to the motor of the centrifugal pump, and the other side of the fixing ring plate 4 is bolted to the pump body. When the fixing ring plates 4 on both sides are fixed to the motor and pump body of the centrifugal pump respectively, the fixing ring plates 4 compress the sealing ring 5, thus sealing the gap between the fixing ring plates 4 and the motor or pump body of the centrifugal pump. At the same time, the fixing ring plates 4 and the extension cylinder 2 slide away from the baffle cylinder 1, increasing the length range of the enclosed isolation, thereby making it suitable for different centrifugal pumps. The centrifugal pump expands the applicability of the water-blocking device. The outer flange of the water-blocking cylinder 1 and the inner flange of the extension cylinder 2 compress the sealing ring 3, increasing its thickness and further sealing the gap between the water-blocking cylinder 1 and the extension cylinder 2. This effectively prevents water from entering the stuffing box of the centrifugal pump, thus preventing water and carried sediment and coal dust from entering the bearing chamber, avoiding grease deterioration and bearing wear caused by sediment and coal dust. This ensures the normal operation of the centrifugal pump and saves on equipment maintenance costs.

[0060] Alternatively, the two connecting discs 10 can be fixedly connected to the two fixing ring plates 4 on both sides with screws. Then, the adjusting nuts 9 at both ends of the slide cylinder 7 can be rotated. The rotation of the adjusting nuts 9 will drive the lead screw 8 to slide from the inside of the slide cylinder 7, pushing the fixing ring plate 4 away from the water baffle cylinder 1, so that the fixing ring plates 4 on both sides press tightly against the motor and pump body of the centrifugal pump respectively. After that, the adjusting nuts 9 at both ends of the other slide cylinders 7 can be rotated in sequence, so that the lead screw 8 pushes the connecting disc 10 to contact the fixing ring plate 4. Then, the connecting disc 10 and the fixing ring plate 4 can be locked and fixed with screws. The fixing ring plate 4 is firmly pressed against the motor and pump body of the centrifugal pump. This avoids the need to open screw holes in the motor and pump body of the centrifugal pump, which facilitates the installation and disassembly work of the staff, and at the same time avoids damage to the centrifugal pump.

[0061] After installation, fill the drying tube 12 with absorbent silica gel granules, filling it to one-half to two-thirds full. This provides space for the silica gel granules to expand after absorbing water, preventing them from being squeezed out of the absorption holes. Then, thread the drying tube 12 onto the bottom inner ring of the sealing cap 11. Finally, insert the drying tube 12 into the water-blocking cylinder 1 through the threaded through hole, and then rotate the sealing cap 11 to install it into the threaded through hole. The absorbent silica gel granules inside the drying tube 12 absorb the moisture inside the water-blocking cylinder 1, ensuring the dryness of the inside of the water-blocking cylinder 1 and reducing the probability of the grease deteriorating when exposed to water.

[0062] When water enters the interior of the water-blocking cylinder 1, the water will accumulate at the bottom of the extension cylinder 2 because the bottom of the inner ring of the extension cylinder 2 is located below the bottom of the water-blocking cylinder 1.

[0063] At this time, the valve on the drain pipe 14 is opened. Since the one-way diaphragm 16 can only bend outwards towards the drain outlet of the drain pipe 14, the water inside the drain pipe 14 can only flow from the inside of the baffle cylinder 1 towards the drain outlet of the drain pipe 14. At the same time, the operator pulls down the push rod 18, causing the piston head 19 to slide downwards, creating a negative pressure inside the drain pipe 14. This causes the one-way diaphragm 16 on the side closer to the baffle cylinder 1 to bend and open, while the one-way diaphragm 16 on the side farther from the baffle cylinder 1 to close, allowing the water inside the baffle cylinder 1 to be drawn into the middle of the drain pipe 14. Then, the push rod 18 is pushed upwards, causing the piston head 19 to slide upwards, increasing the pressure inside the drain pipe 14. This causes the one-way diaphragm 16 on the side closer to the baffle cylinder 1 to close, while the one-way diaphragm 16 on the side farther from the baffle cylinder 1 to bend and open, pressurizing and discharging the water in the middle of the drain pipe 14. This not only drains the water but also effectively prevents external water from entering the drain pipe 14, further improving the water drainage efficiency.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A centrifugal pump stuffing box water-blocking device, characterized in that: The device includes a water-blocking cylinder; extension cylinders are slidably installed on the outer rings of both ends of the water-blocking cylinder; a sealing ring is provided between the extension cylinder and the water-blocking cylinder; the two ends of the sealing ring are fixedly connected to the outer wall of the water-blocking cylinder and the inner wall of the extension cylinder, respectively; a fixing ring plate is fixedly connected to the end of the extension cylinder away from the water-blocking cylinder; and multiple sleeved sealing rings are provided on the side of the fixing ring plate away from the extension cylinder.

2. The centrifugal pump stuffing box water-blocking device according to claim 1, characterized in that: The water-blocking cylinder has multiple fixed seats bolted around its outer ring in the middle; a sliding cylinder is fixedly connected to the middle of each fixed seat; a lead screw is slidably installed inside both ends of the sliding cylinder; an adjusting nut that is threadedly engaged with the lead screw is rotatably installed at both ends of the sliding cylinder; and a connecting plate is fixedly connected to the end of the lead screw away from the fixed seat.

3. A centrifugal pump stuffing box water-blocking device according to claim 1, characterized in that: The water-blocking cylinder has multiple threaded through holes on its outer ring in the middle; a sealing cylinder cover is installed inside the threaded through holes; a drying tube is installed on the bottom inner ring of the sealing cylinder cover; and the drying tube is filled with water-absorbing silica gel particles.

4. A centrifugal pump stuffing box water-blocking device according to claim 1, characterized in that: A water-absorbing silicone ring is provided on the outer wall of the sealing ring.

5. A centrifugal pump stuffing box water-blocking device according to claim 1, characterized in that: A drain pipe is provided at the bottom of one end of the extension cylinder near the fixed ring plate; a valve is provided at the top of the drain pipe.

6. A centrifugal pump stuffing box water-blocking device according to claim 5, characterized in that: The inner wall of the drain outlet of the drain pipe is provided with a cylinder; a mounting bracket is fixedly connected to the inside of the cylinder near the drain pipe; a one-way diaphragm is bolted to the middle of the side of the mounting bracket away from the drain pipe.

7. A centrifugal pump stuffing box water-blocking device according to claim 6, characterized in that: The drain pipe is a tee pipe; the inside of the drain pipe is also provided with a cylinder and a one-way diaphragm; a sealing cap is threadedly installed at the bottom opening of the drain pipe; a push rod is slidably installed in the middle of the sealing cap; a piston head that can slide inside the drain pipe is fixed to the top of the push rod.

Images