Multi-stage pump mechanical seal self-cooling device

Abstract

The utility model discloses a multi-stage pump mechanical seal self-cooling device, and relates to the technical field of multi-stage pumps. The water pump comprises a driving motor, the output end of the driving motor is fixedly connected with an output shaft, the end, away from the driving motor, of the output shaft is rotationally provided with a water pump body, the output shaft penetrates through the water pump body, and the joints of the two ends of the water pump body and the output shaft are each fixedly provided with two mechanical seal assemblies. Water cooling circulating pipes are fixedly installed between the side walls of the two mechanical seal assemblies and the side wall of the water pump body, and bases are fixedly installed at the four corners of the bottom of the water pump body. Through the pressure difference between the interior of the water pump body and the interior of the mechanical seal assembly, water in the water pump body can enter one side of the moving assembly along the water cooling circulating pipe fixedly installed on the side wall of the water pump body to cool the O-shaped ring, and normal work of the water pump body is guaranteed; the problem that the sealing O-shaped ring in the mechanical seal loses efficacy after being heated is solved, and the service life of the O-shaped ring and the pump shaft is greatly prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of multi-stage pumps, and in particular relates to a multi-stage pump machine seal self-cooling device. Background Art

[0002] In life, chemical production is indispensable. In the process of producing liquid raw materials, water pumps play the role of conveying liquids and providing pressure and flow for chemical reactions. If the water pump fails, the entire system will often stop working. Therefore, some people compare the role of the pump to the "heart" in the chemical production process. At the same time, the quality of the pump also directly affects the normal production, so the pump is one of the key equipment in the chemical and petroleum sectors.

[0003] A multistage pump is a pump that connects the impellers of a single-stage pump concentrically through an axis to increase the pump head or pressure while keeping the flow rate constant. A pump with two impellers is called a two-stage pump, and a pump with multiple impellers is called a multistage pump. The medium is first sucked in from the first-stage impeller, and after being pressurized by the first-stage impeller, it enters the suction port of the second-stage impeller through the flow channel or guide vane, and is pressurized by the second-stage impeller. After being pressurized by multiple-stage impellers, the medium is collected by the vortex chamber at the outlet section and flows out through the outlet flange. This is essentially a single-suction multistage pump.

[0004] When a multistage pump is working, a pump shaft and a water pump are connected together with a sealing ring and bolts. Since the pump shaft and the water pump are connected together with a sealing ring and bolts, and the sealing is performed by placing a sealing ring between the ends, during use, the thermal expansion and contraction of the bolts caused by changes in ambient temperature will cause the size of the sealing ring to change, causing water leakage at the connection, and the pump shaft and the parts connected to the pump body will transfer the temperature to the sealing cavity and the pump shaft cavity. In addition, in existing multistage pumps, if there is no cooling measure for the contact part between the rear end of the pump shaft and the pump body, when the pump shaft rotates at high speed, the contact part between the pump shaft and the pump body will generate a lot of high temperature, thereby shortening the service life of the pump shaft.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content

[0006] In view of the problems in the related technology, the utility model proposes a device to overcome the above technical problems existing in the existing related technology.

[0007] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0008] The utility model is a multi-stage pump mechanical seal self-cooling device, comprising a driving motor, wherein the output end of the driving motor is fixedly connected with an output shaft, a water pump body is rotatably installed at one end of the output shaft away from the driving motor, and the output shaft passes through the water pump body, two mechanical seal components are fixedly installed at the connection between the two ends of the water pump body and the output shaft, a moving component is arranged inside the mechanical seal component, an O-ring is arranged on one side of the moving component, and the O-ring is located in the gap between the water pump body and the output shaft, water-cooling circulation pipes are fixedly installed between the side walls of the two mechanical seal components and the side walls of the water pump body, bases are fixedly installed at the four corners of the bottom of the water pump body, and a limiting component for limiting the water flow rate in the water-cooling circulation pipe is arranged in the inner cavity of the mechanical seal component.

[0009] Furthermore, the water pump body comprises a pump body, a water inlet is fixedly mounted on one side of the top of the pump body, and a water outlet is fixedly mounted on the other side of the top of the pump body.

[0010] Furthermore, the mechanical seal assembly includes a mechanical seal block, one end of which is fixedly connected to a fixed plate, a rotating rod is rotatably installed in the inner cavity of the mechanical seal block, and the rotating rod passes through one side of the fixed plate, a turnbuckle is fixedly installed on the side of the rotating rod close to the fixed plate, and a rotating gear is fixedly installed on the circumferential surface of the rotating rod and located in the inner cavity of the mechanical seal block.

[0011] Furthermore, the moving component includes a driving disk, one side of which is engaged with a rotating gear, one side of which is provided with a vortex driving strip, and a plurality of clamping blocks are distributed circumferentially on the mechanical seal block, and the clamping blocks are slidably mounted with the mechanical seal block.

[0012] Furthermore, an arc groove adapted to the scroll drive strip is opened on one side of the clamp block, and the scroll drive strip fits with the arc groove, and the drive plate drives the clamp block to gather together on the machine seal block through the scroll drive strip and the arc groove, so that the clamp block squeezes the middle part of the O-ring until it is sunken, and the inside of the O-ring is rotatably installed with the output shaft, and the O-ring is located in the gap where the pump body and the output shaft are connected.

[0013] Furthermore, a temperature sensor is fixedly installed on one side of the clamping block close to the O-ring, and a water spray outlet for cooling the O-ring is opened inside the clamping block, a cooling pipe is fixedly installed on one end of the water spray outlet away from the O-ring, a plurality of the cooling pipes converge together in the machine sealing block and are connected to the water-cooling circulation pipe, so that the water-cooling circulation pipe supplies water to the plurality of cooling pipes, a moving block for limiting the flow rate of water in the water-cooling circulation pipe is provided in the inner cavity of the machine sealing block, a telescopic rod is fixedly installed on one end of the moving block, and the telescopic rod is fixedly installed to the machine sealing block.

[0014] The utility model has the following beneficial effects:

[0015] 1. The utility model uses the pressure difference between the water pump body and the mechanical seal assembly to allow the water in the water pump body to enter one side of the moving assembly along the water-cooling circulation pipe fixedly installed on the side wall of the water pump body to cool the O-ring, thereby ensuring the normal operation of the water pump body, solving the problem of heat failure of the sealing O-ring inside the mechanical seal, and greatly increasing the service life of the O-ring and the pump shaft.

[0016] 2. The utility model moves the components together inside, and the components inside the components squeeze the middle of the O-ring until it is sunken, thereby ensuring the fit between the O-ring and the output shaft, achieving better sealing of the water pump body by the O-ring, and further solving the problem of water leakage at the connection between the pump shaft and the water pump when the water pump is working, so that a greater pressure can be obtained inside the water pump.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the utility model embodiments, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a three-dimensional structural diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the drive motor of the utility model;

[0021] Figure 3 This is a schematic diagram of a mechanical seal assembly of the utility model;

[0022] Figure 4 It is a schematic diagram of the drive disk of the utility model;

[0023] Figure 5 It is a schematic diagram of the arc groove of the utility model;

[0024] Figure 6 It is a schematic diagram of the temperature sensor of the utility model;

[0025] Figure 7 It is a schematic diagram of the O-ring of the utility model;

[0026] Figure 8 It is a schematic diagram of a moving block of the utility model;

[0027] Fig. 9This is a schematic diagram of the output shaft of the utility model;

[0028] Fig.10 It is a schematic diagram of the rotating rod of the utility model;

[0029] Fig.11 It is a schematic diagram of a fixing plate of the present utility model.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 1. Drive motor; 2. Output shaft; 3. Pump body; 301. Pump body; 302. Water inlet; 303. Water outlet; 4. Mechanical seal assembly; 401. Mechanical seal block; 402. Fixed plate; 403. Rotating rod; 404. Rotating gear; 405. Turnbuckle; 406. Drive disc; 407. Vortex drive strip; 408. Clamp block; 409. Arc groove; 410. Water spray nozzle; 411. Temperature sensor; 412. Cooling pipe; 5. Water cooling circulation pipe; 501. Moving block; 502. Telescopic rod; 6. Base; 7. Moving assembly; 8. O-ring; 9. Limiting assembly. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the described embodiments are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the present utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0034] See also Figure 1-Figure 11As shown, the utility model is a multi-stage pump mechanical seal self-cooling device, comprising a driving motor 1, wherein the output end of the driving motor 1 is fixedly connected with an output shaft 2, a water pump body 3 is rotatably installed at one end of the output shaft 2 away from the driving motor 1, and the output shaft 2 passes through the water pump body 3, two mechanical seal components 4 are fixedly installed at the connection between the two ends of the water pump body 3 and the output shaft 2, a moving component 7 is arranged inside the mechanical seal component 4, an O-ring 8 is arranged on one side of the moving component 7, and the O-ring 8 is located in the gap between the water pump body 3 and the output shaft 2, a water-cooling circulation pipe 5 is fixedly installed between the side walls of the two mechanical seal components 4 and the side walls of the water pump body 3, a base 6 is fixedly installed at the four corners of the bottom of the water pump body 3, and a limiting component 9 for limiting the water amount in the water-cooling circulation pipe 5 is arranged in the inner cavity of the mechanical seal component 4.

[0035] When the multi-stage pump is working, the moving component 7 is rotated with a screwdriver to make its insides gather together, so that the original parts inside the moving component 7 squeeze the middle part of the O-ring 8 until it is sunken, thereby ensuring the fit between the O-ring 8 and the output shaft 2, and achieving a better sealing of the water pump body 3 by the O-ring 8. Since the output end of the driving motor 1 drives the output shaft 2 to rotate, and due to the rotation of the output shaft 2, the two mechanical seal components 4 fixedly installed at the connection between the two ends of the water pump body 3 and the output shaft 2 will generate heat due to the mutual friction between the rotation of the output shaft 2 and the two mechanical seal components 4. Since the increase in heat will cause damage to the O-ring 8 at the connection between the output shaft 2 and the two mechanical seal components 4, it is necessary to cool the O-ring 8. When the temperature sensing part of the moving component 7 on one side of the O-ring 8 senses the temperature rise of the O-ring 8, it is known that the driving end pressure of the water pump must be lower than the non-driving end pressure, that is, the pressure in the water pump body 3 is greater than the pressure in the two mechanical seal components 4. Since the pressure in the water pump body 3 is greater than the pressure in the mechanical seal components 4, the water in the water pump body 3 will enter the mechanical seal component 4 along the water cooling circulation pipe 5 fixedly installed on the side wall of the water pump body 3. At this time, the limiting component 9 for limiting the water flow rate in the water cooling circulation pipe 5 set in the inner cavity of the mechanical seal component 4 is opened, so that the water connected to the moving component 7 enters from the water cooling circulation pipe 5 to one side of the moving component 7 to cool the O-ring 8, so as to ensure the normal operation of the water pump body 3;

[0036] Thus, through the pressure difference between the water pump body 3 and the mechanical seal assembly 4, the water in the water pump body 3 will enter the side of the moving assembly 7 along the water cooling circulation pipe 5 fixedly installed on the side wall of the water pump body 3 to cool the O-ring 8, thereby ensuring the normal operation of the water pump body 3, solving the problem of heat failure of the sealing O-ring 8 inside the mechanical seal, and greatly increasing the service life of the O-ring 8 and the pump shaft;

[0037] And by the mutual gathering of the internal parts of the moving component 7, the original parts inside the moving component 7 squeeze the middle part of the O-ring 8 until it is sunken, thereby ensuring the fit between the O-ring 8 and the output shaft 2, achieving a better sealing of the O-ring 8 on the water pump body 3, and thus solving the problem of water leakage at the connection between the pump shaft and the water pump when the water pump is working, so that a higher pressure can be obtained inside the water pump.

[0038] In addition, in specific applications, the functions, appearances, and structures of the two mechanical seal components 4 and the two water-cooling circulation pipes 5 are completely the same.

[0039] In one embodiment, for the above, the water pump body 3 includes a pump body 301 , a water inlet 302 is fixedly installed on one side of the top of the pump body 301 , and a water outlet 303 is fixedly installed on the other side of the top of the pump body 301 .

[0040] The driving motor 1 drives the output shaft 2 at the output end to rotate, so that the output shaft 2 drives the impeller (the impeller is an existing structure, not shown in the figure) to rotate. The rotation of the impeller causes water to enter the water pump body 3 from the water inlet 302. The water in the water pump body 3 obtains kinetic energy under the rotation of the impeller and is discharged from the water outlet 303.

[0041] In one embodiment, for the above-mentioned mechanical seal assembly 4, the mechanical seal assembly 4 includes a mechanical seal block 401, one end of the mechanical seal block 401 is fixedly connected to a fixed plate 402, a rotating rod 403 is rotatably installed in the inner cavity of the mechanical seal block 401, and the rotating rod 403 penetrates to one side of the fixed plate 402, a turnbuckle 405 is fixedly installed on the side of the rotating rod 403 close to the fixed plate 402, a rotating gear 404 is fixedly installed on the circumferential surface of the rotating rod 403 and located in the inner cavity of the mechanical seal block 401, and the moving assembly 7 includes a driving disk 406, one side of the driving disk 406 is meshed with the rotating gear 404, and one side of the driving disk 406 is provided with a vortex drive The mechanical seal block 401 is provided with a plurality of clamping blocks 408 distributed circumferentially, and the clamping blocks 408 are slidably installed with the mechanical seal block 401, and an arc groove 409 adapted to the vortex drive strip 407 is opened on one side of the clamping block 408, and the vortex drive strip 407 is matched with the arc groove 409, and the driving plate 406 drives the clamping blocks 408 to gather together on the mechanical seal block 401 through the vortex drive strip 407 and the arc groove 409, so that the clamping blocks 408 squeeze the middle part of the O-ring 8 until it is sunken, and the inside of the O-ring 8 is rotatably installed with the output shaft 2, and the O-ring 8 is located in the gap where the pump body 301 is connected to the output shaft 2.

[0042] Use a screwdriver to turn the turnbuckle 405. Since the turnbuckle 405 is fixedly installed with the rotating rod 403, the turnbuckle 405 will drive the rotating rod 403 to rotate along with the turnbuckle 405. At the same time, the rotating rod 403 will drive the rotating gear 404 fixedly installed thereon to rotate. Since a driving disk 406 is meshed on one side of the rotating gear 404, the rotating gear 404 will also drive the driving disk 406 to rotate. When the driving disk 406 rotates, the vortex driving strip 407 opened on one side of the driving disk 406 will be driven to rotate. An arc groove 409 matched with the scroll drive strip 407 is opened on one side of the block 408. The plurality of clamping blocks 408 move along the scroll drive strip 407 under the sliding cooperation between the scroll drive strip 407 and the arc groove 409, so that the plurality of clamping blocks 408 are close to each other and squeeze the middle part of the O-ring 8 until it is sunken. Since the O-ring 8 is located in the gap between the pump body 301 and the output shaft 2, the sunken middle part of the O-ring 8 ensures the fit between the O-ring 8 and the output shaft 2 inside the O-ring 8, thereby achieving a better sealing of the O-ring 8 on the water pump body 3.

[0043] Thus, by rotating the turnbuckle 405 with a screwdriver, the plurality of clamping blocks 408 are brought closer to each other to squeeze the middle portion of the O-ring 8 until it is sunken, thereby ensuring the fit between the O-ring 8 and the output shaft 2 inside the O-ring 8, achieving a better sealing of the O-ring 8 on the water pump body 3, and enabling a greater pressure to be obtained inside the water pump when the water pump is working.

[0044] In one embodiment, for the above-mentioned clamping block 408, a temperature sensor 411 is fixedly installed on one side of the clamping block 408 close to the O-ring 8, and a water spray outlet 410 for cooling the O-ring 8 is opened inside the clamping block 408, and a cooling pipe 412 is fixedly installed on one end of the water spray outlet away from the O-ring 8, and a plurality of the cooling pipes 412 converge together in the mechanical sealing block 401 and are connected to the water-cooling circulation pipe 5, so that the water-cooling circulation pipe 5 supplies water to the plurality of the cooling pipes 412, and a moving block 501 for limiting the flow rate of water in the water-cooling circulation pipe 5 is provided in the inner cavity of the mechanical sealing block 401, and a telescopic rod 502 is fixedly installed on one end of the moving block 501, and the telescopic rod 502 is fixedly installed on the mechanical sealing block 401.

[0045] When the internal temperature of the O-ring 8 rises, the temperature sensor 411 on one side of the O-ring 8 first senses the increase in the temperature of the O-ring 8. Since the pressure in the water pump body 3 is greater than the pressure in the mechanical seal assembly 4, the water in the water pump body 3 will enter the water-cooling circulation pipe 5 fixedly installed on the side wall of the water pump body 3. At this time, the telescopic rod 502 pulls the mechanical seal block 401 fixedly installed therewith to move, so as to prevent the water in the water-cooling circulation pipe 5 from entering the mechanical seal block 401. The water in the mechanical seal block 401 enters the water spray port 410 of the clamp block 408 through each cooling pipe 412. The water spray port 410 cools the O-ring 8 with water by bringing the water into contact with the O-ring 8.

[0046] The temperature sensor 411 on one side of the O-ring 8 senses the temperature rise, and uses the telescopic rod 502 to pull the machine seal block 401 to move to release the restriction on the water in the water-cooling circulation pipe 5, so that the water contacts the O-ring 8 through the water nozzle 410 to cool it down, ensuring the normal operation of the water pump body 3, solving the problem of the failure of the sealing O-ring 8 inside the machine seal due to heat, and greatly increasing the service life of the O-ring 8 and the pump shaft.

[0047] In summary, with the aid of the above technical solution of the utility model, the output shaft 2 at the output end is driven to rotate by the driving motor 1, so that the output shaft 2 drives the impeller (the impeller is an existing structure, which is not drawn in the figure) to rotate, and the rotation of the impeller causes water to enter the water pump body 3 from the water inlet 302, and the water in the water pump body 3 obtains kinetic energy under the rotation of the impeller and is discharged from the water outlet 303. In order to ensure the pressure of the water pump body 3, the screw button 405 is rotated with a screwdriver, and the screw button 405 drives the rotating rod 403 to rotate, and the rotating rod 403 drives the rotating gear 404 to rotate, and the rotating gear 404 also drives the driving disk 406 to rotate, and the driving disk 406 drives the vortex drive bar 407 to rotate. Since an arc groove 409 adapted to the vortex drive bar 407 is opened on one side of the plurality of clamping blocks 408, the plurality of clamping blocks 408 move along the vortex drive bar 407 under the sliding cooperation between the vortex drive bar 407 and the arc groove 409, so that the plurality of clamping blocks 408 The middle part of the O-ring 8 is squeezed close to each other until it is sunken. Since the O-ring 8 is located in the gap between the pump body 301 and the output shaft 2, the sunken middle part of the O-ring 8 ensures the fit between the O-ring 8 and the output shaft 2 inside the O-ring 8, so that the O-ring 8 can better seal the water pump body 3. When the internal temperature of the O-ring 8 increases, the temperature sensor 411 on one side of the O-ring 8 first senses the increase in the temperature of the O-ring 8. Since the pressure inside the water pump body 3 is greater than the pressure inside the mechanical seal assembly 4, the water in the water pump body 3 will enter the water-cooling circulation pipe 5 fixedly installed on the side wall of the water pump body 3. At this time, the telescopic rod 502 pulls the sealing block 401 to move to release the water in the water-cooling circulation pipe 5 from entering the mechanical sealing block 401. The water in the mechanical sealing block 401 enters the water spray port 410 of the clamping block 408 through each cooling pipe 412. The water spray port 410 cools the O-ring 8 with water by bringing the water into contact with the O-ring 8.

[0048] Through the above technical solution, 1. the temperature sensor 411 on one side of the O-ring 8 senses the temperature rise, and the telescopic rod 502 is used to pull the sealing block 401 to move to release the restriction on the water in the water-cooling circulation pipe 5, so that the water contacts the O-ring 8 through the water nozzle 410 to cool it down, thereby ensuring the normal operation of the water pump body 3, solving the problem of the failure of the sealing O-ring 8 inside the mechanical seal due to heat, and greatly increasing the service life of the O-ring 8 and the pump shaft.

[0049] 2. By rotating the turnbuckle 405 with a screwdriver, the plurality of clamping blocks 408 are brought closer to each other to squeeze the middle of the O-ring 8 until it is sunken, thereby ensuring the fit between the O-ring 8 and the output shaft 2 inside the O-ring 8, achieving a better sealing of the O-ring 8 on the water pump body 3, and enabling the water pump to obtain a greater pressure inside when the water pump is working.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-stage pump seal self-cooling device, comprising a drive motor (1), Features: The output end of the driving motor (1) is fixedly connected to an output shaft (2); a water pump body (3) is rotatably mounted on one end of the output shaft (2) away from the driving motor (1); and the output shaft (2) passes through the water pump body (3); two mechanical seal components (4) are fixedly mounted at the connection points between the two ends of the water pump body (3) and the output shaft (2); a moving component (7) is arranged inside the mechanical seal component (4); an O-ring (8) is arranged on one side of the moving component (7); the O-ring (8) is located in the gap between the water pump body (3) and the output shaft (2); a water cooling circulation pipe (5) is fixedly mounted between the side walls of the two mechanical seal components (4) and the side walls of the water pump body (3); a base (6) is fixedly mounted at the four corners of the bottom of the water pump body (3); and a limiting component (9) for limiting the amount of water in the water cooling circulation pipe (5) is arranged in the inner cavity of the mechanical seal component (4).

2. A multi-stage pump seal self-cooling device according to claim 1, It is characterized in that The water pump body (3) comprises a pump body (301), a water inlet (302) is fixedly mounted on one side of the top of the pump body (301), and a water outlet (303) is fixedly mounted on the other side of the top of the pump body (301).

3. A multi-stage pump seal self-cooling device according to claim 2, It is characterized in that The mechanical seal assembly (4) comprises a mechanical seal block (401), one end of which is fixedly connected to a fixed plate (402), a rotating rod (403) is rotatably installed in the inner cavity of the mechanical seal block (401), and the rotating rod (403) passes through one side of the fixed plate (402), a screw buckle (405) is fixedly installed on the side of the rotating rod (403) close to the fixed plate (402), and a rotating gear (404) is fixedly installed on the circumferential surface of the rotating rod (403) and located in the inner cavity of the mechanical seal block (401).

4. A multi-stage pump seal self-cooling device according to claim 3, It is characterized in that The moving assembly (7) comprises a driving disk (406), one side of which is meshed with a rotating gear (404), one side of which is provided with a vortex driving strip (407), and a plurality of clamping blocks (408) are distributed circumferentially on the mechanical seal block (401), and the clamping blocks (408) are slidably mounted on the mechanical seal block (401).

5. A multi-stage pump seal self-cooling device according to claim 4, It is characterized in that An arc groove (409) adapted to the vortex drive strip (407) is provided on one side of the clamping block (408), and the vortex drive strip (407) is matched with the arc groove (409). The driving plate (406) drives the clamping block (408) to gather together on the machine seal block (401) through the vortex drive strip (407) and the arc groove (409), so that the clamping block (408) squeezes the middle part of the O-ring (8) until it is sunken. The inside of the O-ring (8) is rotatably installed with the output shaft (2), and the O-ring (8) is located in the gap between the pump body (301) and the output shaft (2).

6. A multi-stage pump seal self-cooling device according to claim 5, It is characterized in that A temperature sensor (411) is fixedly installed on one side of the clamping block (408) close to the O-ring (8), and a water spray port (410) for cooling the O-ring (8) is provided inside the clamping block (408), and a cooling pipe (412) is fixedly installed on one end of the water spray port away from the O-ring. A plurality of cooling pipes (412) converge together in the machine sealing block (401) and are connected to the water cooling circulation pipe (5), so that the water cooling circulation pipe (5) supplies water to the plurality of cooling pipes (412). A moving block (501) for limiting the flow rate of water in the water cooling circulation pipe (5) is provided in the inner cavity of the machine sealing block (401), and a telescopic rod (502) is fixedly installed on one end of the moving block (501), and the telescopic rod (502) is fixedly installed on the machine sealing block (401).

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