Cooling device of output screw pump reduction gearbox shaft lever

Abstract

The utility model discloses a cooling device for an output screw pump reduction gearbox shaft lever, which comprises a reduction gearbox body internally provided with a universal joint, two sides of the reduction gearbox body are respectively fixed with a first shaft tube and a second shaft tube which are communicated with the interior of the reduction gearbox body, and the tube walls of the first shaft tube and the second shaft tube are hollow. A box body is fixed to the side wall of the reduction gearbox, and a first water pipe is installed on one side of the box body and connected with the side wall of the first shaft pipe. A water pump is installed on the other side of the box body, the output end of the water pump is connected with the side wall of the second shaft pipe, and the side wall of the second shaft pipe and the side wall of the first shaft pipe are connected with second water pipes. Cooling liquid in the box body flows in a loop formed by the water pump, the cavity of the second shaft pipe, the second water pipe, the cavity of the first shaft pipe and the first water pipe, heat generated by rotation of the two ends of the universal joint in the first shaft pipe and the second shaft pipe is dissipated, high-temperature damage to a sealing bearing can be effectively avoided, water is prevented from penetrating into the reduction gearbox, and the service life of the reduction gearbox is prolonged. Engine oil in the reduction gearbox is prevented from being emulsified.

Description

Technical Field

[0001] The utility model belongs to the technical field of speed reducers, and particularly relates to a temperature reduction device for the shaft of an external transmission screw pump speed reducer. Background Art

[0002] At present, the gears of the external transmission screw pump speed reducer and the rotor pump used in oilfield exploitation are installed on an integrated bearing housing. The integrated bearing housing has the problems of troublesome installation components and complex processing steps. The Chinese utility model patent with the publication number CN206159437U discloses a connecting structure for the speed reducer housing of a cam rotor pump with a positioning function. It separates the gear housing design, improves the strength of the housing to support the main shaft, improves the rotational stability of the main shaft, is convenient for the installation of the main shaft, relatively simple to disassemble, and the processing of the gear housing is also more convenient, reducing the manufacturing cost of the housing. However, the above solution still has the problem of difficult temperature reduction at the shaft rotation part, which easily causes damage to the sealed bearing and the seal, resulting in poor sealing, allowing water to penetrate into the interior of the speed reducer, causing emulsification of the engine oil inside the speed reducer, reducing the service life, requiring regular replacement of the engine oil, with poor effects, increasing costs and increasing the operation risk of personnel. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a temperature reduction device for the shaft of an external transmission screw pump speed reducer, which can cool the shaft rotation parts at both ends of the universal shaft, thereby reducing the damage to the sealed bearing and the seal and improving the service life of the speed reducer.

[0004] The technical solution adopted by the utility model is: a temperature reduction device for the shaft of an external transmission screw pump speed reducer, including a speed reducer body with a universal joint installed inside. On both sides of the speed reducer body, a first shaft tube and a second shaft tube respectively fixed and communicating with its interior are provided. The tube walls of the first shaft tube and the second shaft tube are hollow. The shaft rods at both ends of the universal joint are respectively sleeved in the first shaft tube and the second shaft tube through sealed bearings.

[0005] On the surface of the side wall of the speed reducer body between the first shaft tube and the second shaft tube, a box body for containing coolant is fixedly connected. A water pump is installed on the side of the box body. The output end of the water pump is communicated with the tube wall of the second shaft tube through a pipeline. A second water pipe is communicated between the tube walls of the second shaft tube and the first shaft tube, and the second water pipe surrounds the outer surface of the speed reducer body on the side away from the box body. A first water pipe is communicated between the tube wall of the first shaft tube and the box body.

[0006] The characteristics of the utility model also lie in:

[0007] A sealing cover plate is covered on the top of the speed reducer body. An inner groove is provided at the top of the side wall of the speed reducer body. A clamping groove is opened inside the inner groove. A clamping strip fixedly connected with the clamping groove is provided at the bottom of the sealing cover plate.

[0008] A plurality of first screw holes are evenly formed at the top of the side wall of the speed reducer body, and the plurality of first screw holes are located outside the inner groove. A plurality of second screw holes corresponding to the first screw holes are formed at the top of the sealing cover plate, and a first bolt is threadedly connected between the first screw hole and the second screw hole.

[0009] An oil inlet pipe is fixedly connected to the top of the sealing cover plate, and a first sealing cover is threadedly connected to the pipe orifice of the oil inlet pipe.

[0010] An oil drain pipe is fixedly connected to the bottom of the speed reducer body, and a second sealing cover is threadedly connected to the pipe orifice of the oil drain pipe.

[0011] One end of the second shaft tube far from the universal joint is fixedly connected with a flange plate, and a sealing disc is fixedly sealed on the flange plate.

[0012] A plurality of third screw holes corresponding to the screw holes of the flange plate are formed on the sealing disc, and a second bolt passes through the third screw hole and the screw hole of the flange plate.

[0013] The beneficial effects of the utility model are as follows:

[0014] By using the first shaft tube and the second shaft tube with hollow pipe walls, and surrounding the outer surface of the speed reducer body with a coolant flow circuit formed by the box body, the water pump, the cavity of the second shaft tube, the second water pipe, the cavity of the first shaft tube, and the first water pipe, the coolant inside the box body is pumped by the water pump. The coolant is transported through the pipeline to the cavity inside the second shaft tube, and then through the second water pipe to the cavity inside the first shaft tube, and finally transported back to the box body through the first water pipe, thus forming a cycle. When the coolant is circulated and transported, the first water pipe and the second water pipe are in contact with the external air for natural cooling of the coolant. When the coolant flows through the cavity, the heat generated by the rotation of both ends of the universal joint inside the first shaft tube and the second shaft tube is collected and dissipated, which can effectively prevent the high-temperature damage of the sealed bearing, prevent water from penetrating into the speed reducer internal and causing the emulsification of the lubricating oil inside the speed reducer, improve the service life of the speed reducer, and reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the overall three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 is the side three-dimensional structural schematic diagram of the utility model;

[0017] Figure 3 is the sectional three-dimensional structural schematic diagram of the speed reducer of the utility model;

[0018] Figure 4 is the bottom three-dimensional structural schematic diagram of the utility model.

[0019] In the figure: 1. Reduction gearbox body; 2. Sealing cover plate; 3. First shaft tube; 4. Second shaft tube; 5. Sealing cavity; 6. Box body; 7. Water pump; 8. Second water pipe; 9. First water pipe; 10. Flange; 11. Universal joint; 12. Groove; 13. Card slot; 14. Card strip; 15. First screw hole; 16. Second screw hole; 17. First bolt; 18. Oil inlet pipe; 19. First sealing cover; 20. Second sealing cover; 21. Sealing disc; 22. Second screw hole; 23. Second bolt; 24. Oil drain pipe. Detailed implementation mode

[0020] The present utility model will be described in detail below in conjunction with the accompanying drawings and the detailed implementation mode.

[0021] Embodiment 1

[0022] As Figure 1 and Figure 2 shown, the present utility model includes a reduction gearbox body 1 and a sealing cover plate 2. The sealing cover plate 2 is covered on the top of the reduction gearbox body 1. A first shaft tube 3 and a second shaft tube 4 are respectively fixed on both sides of the reduction gearbox body 1. As Figure 3 shown, one ends of the first shaft tube 3 and the second shaft tube 4 penetrate into the interior of the reduction gearbox body 1 and are communicated with the reduction gearbox body 1. The pipe walls of the first shaft tube 3 and the second shaft tube 4 are hollow, and the hollow areas both form a sealing cavity 5. Sealing bearings are sleeved inside the first shaft tube 3 and the second shaft tube 4. There is a universal joint 11 inside the reduction gearbox body 1. The shaft rods at both ends of the universal joint 11 are respectively located inside the first shaft tube 3 and the second shaft tube 4 and are connected to the inner walls of the two shaft tubes through sealing bearings.

[0023] A box body 6 for storing coolant is fixedly connected to the side wall surface of the reduction gearbox body 1. The box body 6 is located between the first shaft tube 3 and the second shaft tube 4. A first water pipe 9 is connected between the box body 6 and the first shaft tube 3. One end of the first water pipe 9 is communicated with the box body 6, and the other end is fixedly connected to the pipe wall of the first shaft tube 3 and is communicated with the sealing cavity 5 inside it; a second water pipe 8 is connected between the pipe walls of the first shaft tube 3 and the second shaft tube 4. The second water pipe 8 surrounds the side of the reduction gearbox body 1 away from the box body 6. One end of the second water pipe 8 is fixedly connected to the pipe wall of the first shaft tube 3 and is communicated with the sealing cavity 5 inside it, and the other end is fixedly connected to the pipe wall of the second shaft tube 4 and is communicated with the sealing cavity 5 inside it; a water pump 7 is fixed on one side of the box body 6 close to the second shaft tube 4. The input end of the water pump 7 extends into the interior of the box body 6, and the output end of the water pump 7 is communicated with the sealing cavity 5 inside the pipe wall of the second shaft tube 4 through a pipeline.

[0024] The coolant flow circuit that surrounds the outer surface of the speed reducer body 1 is formed by the box body 6, the water pump 7, the sealing cavity of the second shaft tube 4, the second water pipe 8, the sealing cavity of the first shaft tube 3, and the first water pipe 9. During use, the water pump 7 is started. The water pump 7 extracts the coolant inside the box body 6. The extracted coolant is transported through the pipeline to the sealing cavity 5 inside the second shaft tube 4, and then through the second water pipe 8 to the sealing cavity 5 inside the first shaft tube 3. Finally, it is transported back to the inside of the box body 6 through the first water pipe 9, thus forming a cycle. When the coolant is circulated and transported, the first water pipe 9 and the second water pipe 8 are exposed to the outside, and the circulated coolant is naturally cooled. When the coolant flows through the sealing cavity 5, the heat generated by the rotation of the shaft rods at both ends of the universal joint 11 on the inner side walls of the first shaft tube 3 and the second shaft tube 4 is collected and dissipated, effectively avoiding the high-temperature damage of the sealed bearing, preventing water from penetrating into the inside of the speed reducer body 1, preventing the emulsification of the engine oil inside the speed reducer body 1, increasing the service life of the speed reducer, and reducing the cost.

[0025] Embodiment 2

[0026] As Figure 1 and Figure 2 shown, the utility model includes a speed reducer body 1 and a sealing cover plate 2. The sealing cover plate 2 is covered on the top of the speed reducer body 1. The first shaft tube 3 and the second shaft tube 4 are respectively fixed on both sides of the speed reducer body 1. As Figure 3 shown, one end of the first shaft tube 3 and the second shaft tube 4 penetrates into the inside of the speed reducer body 1 and is communicated with the speed reducer body 1. The pipe walls of the first shaft tube 3 and the second shaft tube 4 are hollow, and the hollow areas both form sealing cavities 5. Sealed bearings are sleeved inside both the first shaft tube 3 and the second shaft tube 4. There is a universal joint 11 inside the speed reducer body 1. The shaft rods at both ends of the universal joint 11 are respectively located inside the first shaft tube 3 and the second shaft tube 4 and are connected to the inner walls of the two shaft tubes through sealed bearings.

[0027] A box body 6 for storing coolant is fixedly connected to the side wall surface of the speed reducer body 1. The box body 6 is located between the first shaft tube 3 and the second shaft tube 4. A first water pipe 9 is connected between the box body 6 and the first shaft tube 3. One end of the first water pipe 9 is communicated with the box body 6, and the other end is fixedly connected to the pipe wall of the first shaft tube 3 and is communicated with the sealing cavity 5 inside it; a second water pipe 8 is connected between the pipe walls of the first shaft tube 3 and the second shaft tube 4. The second water pipe 8 surrounds the side of the speed reducer body 1 away from the box body 6. One end of the second water pipe 8 is fixedly connected to the pipe wall of the first shaft tube 3 and is communicated with the sealing cavity 5 inside it, and the other end is fixedly connected to the pipe wall of the second shaft tube 4 and is communicated with the sealing cavity 5 inside it; a water pump 7 is fixed on the side of the box body 6 close to the second shaft tube 4. The input end of the water pump 7 extends into the inside of the box body 6, and the output end of the water pump 7 is communicated with the sealing cavity 5 inside the pipe wall of the second shaft tube 4 through a pipeline.

[0028] In this embodiment, an inner groove 12 is provided at the top of the side wall of the speed reducer body 1. A clamping groove 13 is formed inside the inner groove 12. A clamping strip 14 is fixedly connected to the bottom of the sealing cover plate 2. When the sealing cover plate 2 is closed, the clamping strip 14 is inserted into the inner groove 12, and the clamping strip 14 is clamped with the clamping groove 13. A plurality of first screw holes 15 are evenly formed in the top of the side wall of the speed reducer body 1. The plurality of first screw holes 15 are located outside the inner groove 12. A plurality of second screw holes 16 corresponding to the positions of the first screw holes 15 are evenly formed in the sealing cover plate 2. A first bolt 17 is threadedly connected between the first screw hole 15 and the second screw hole 16.

[0029] During use, pick up the sealing cover plate 2, insert the clamping strip 14 into the inner groove 12, adjust the clamping strip 14 to align with the clamping groove 13. After alignment, manually press the sealing cover plate 2 to make the clamping strip 14 snap into the inside of the clamping groove 13. Then adjust the alignment of the first screw hole 15 and the second screw hole 16, and screw the first bolt 17 into the first screw hole 15 and the second screw hole 16 to fixedly connect the speed reducer body 1 and the sealing cover plate 2, thereby sealing the speed reducer body 1.

[0030] Embodiment 3

[0031] As Figure 1 and Figure 2 shown, the utility model includes a speed reducer body 1 and a sealing cover plate 2. The sealing cover plate 2 is closed on the top of the speed reducer body 1. A first shaft tube 3 and a second shaft tube 4 are respectively fixed on both sides of the speed reducer body 1. As Figure 3 shown, one ends of the first shaft tube 3 and the second shaft tube 4 penetrate into the speed reducer body 1 and are communicated with the speed reducer body 1. The pipe walls of the first shaft tube 3 and the second shaft tube 4 are hollow, and a sealing cavity 5 is formed in the hollow area. Sealing bearings are sleeved in both the first shaft tube 3 and the second shaft tube 4. There is a universal joint 11 in the speed reducer body 1. The shaft rods at both ends of the universal joint 11 are respectively located in the first shaft tube 3 and the second shaft tube 4 and are connected to the inner walls of the two shaft tubes through sealing bearings.

[0032] A box body 6 for storing coolant is fixedly connected to the surface of the side wall of the speed reducer body 1. The box body 6 is located between the first shaft tube 3 and the second shaft tube 4. A first water pipe 9 is connected between the box body 6 and the first shaft tube 3. One end of the first water pipe 9 is communicated with the box body 6, and the other end is fixedly connected to the pipe wall of the first shaft tube 3 and is communicated with the sealing cavity 5 inside it; A second water pipe 8 is connected between the pipe walls of the first shaft tube 3 and the second shaft tube 4. The second water pipe 8 surrounds the side of the speed reducer body 1 away from the box body 6. One end of the second water pipe 8 is fixedly connected to the pipe wall of the first shaft tube 3 and is communicated with the sealing cavity 5 inside it, and the other end is fixedly connected to the pipe wall of the second shaft tube 4 and is communicated with the sealing cavity 5 inside it; A water pump 7 is fixed on one side of the box body 6 close to the second shaft tube 4. The input end of the water pump 7 extends into the inside of the box body 6, and the output end of the water pump 7 is communicated with the sealing cavity 5 inside the pipe wall of the second shaft tube 4 through a pipeline.

[0033] In this embodiment, an oil inlet pipe 18 is connected to the top of the sealing cover plate 2, and a first sealing cover 19 is threadedly connected to the pipe orifice of the oil inlet pipe 18; the first sealing cover 19 is used to seal the oil inlet pipe 18.

[0034] During use, rotate the first sealing cover 19 to remove it from the oil inlet pipe 18, which is convenient for observing the engine oil inside the speed reducer body 1 and also convenient for pouring in the engine oil.

[0035] Embodiment 4

[0036] As Figure 1 and Figure 2 shown, the utility model includes a speed reducer body 1 and a sealing cover plate 2. The sealing cover plate 2 covers the top of the speed reducer body 1. A first shaft pipe 3 and a second shaft pipe 4 are respectively fixed on both sides of the speed reducer body 1. As Figure 3 shown, one ends of the first shaft pipe 3 and the second shaft pipe 4 penetrate into the inside of the speed reducer body 1 and are communicated with the speed reducer body 1. The pipe walls of the first shaft pipe 3 and the second shaft pipe 4 are hollow, and sealed cavities 5 are formed in the hollow areas. Sealed bearings are sleeved inside both the first shaft pipe 3 and the second shaft pipe 4. There is a universal joint 11 inside the speed reducer body 1. The shaft rods at both ends of the universal joint 11 are respectively located inside the first shaft pipe 3 and the second shaft pipe 4 and are connected to the inner walls of the two shaft pipes through sealed bearings.

[0037] A box body 6 for storing coolant is fixedly connected to the side wall surface of the speed reducer body 1. The box body 6 is located between the first shaft pipe 3 and the second shaft pipe 4. A first water pipe 9 is connected between the box body 6 and the first shaft pipe 3. One end of the first water pipe 9 is communicated with the box body 6, and the other end is fixedly connected to the pipe wall of the first shaft pipe 3 and is communicated with the sealed cavity 5 inside it; a second water pipe 8 is connected between the pipe walls of the first shaft pipe 3 and the second shaft pipe 4. The second water pipe 8 surrounds the side of the speed reducer body 1 away from the box body 6. One end of the second water pipe 8 is fixedly connected to the pipe wall of the first shaft pipe 3 and is communicated with the sealed cavity 5 inside it, and the other end is fixedly connected to the pipe wall of the second shaft pipe 4 and is communicated with the sealed cavity 5 inside it; a water pump 7 is fixed on one side of the box body 6 close to the second shaft pipe 4. The input end of the water pump 7 extends into the inside of the box body 6, and the output end of the water pump 7 is communicated with the sealed cavity 5 inside the pipe wall of the second shaft pipe 4 through a pipeline.

[0038] In this embodiment, an oil drain pipe 24 is fixed to the bottom of the speed reducer body 1. As Figure 4 shown, a second sealing cover 20 is threadedly connected to the pipe orifice of the oil drain pipe 24. The second sealing cover 20 is used to seal the oil drain pipe 24.

[0039] During use, rotate the second sealing cover 20 to remove it from the oil drain pipe 24, which is convenient for discharging the engine oil inside the speed reducer body 1.

[0040] Embodiment 5

[0041] As Figure 1 and Figure 2 shown, the utility model includes a reduction gearbox body 1 and a sealing cover plate 2. The sealing cover plate 2 is covered on the top of the reduction gearbox body 1. A first shaft tube 3 and a second shaft tube 4 are respectively fixed on both sides of the reduction gearbox body 1. As Figure 3 shown, one ends of the first shaft tube 3 and the second shaft tube 4 penetrate into the interior of the reduction gearbox body 1 and are communicated with the reduction gearbox body 1. The pipe walls of the first shaft tube 3 and the second shaft tube 4 are hollow, and sealed cavities 5 are formed in the hollow areas. Sealed bearings are sleeved in both the first shaft tube 3 and the second shaft tube 4. There is a universal joint 11 in the reduction gearbox body 1. The shaft rods at both ends of the universal joint 11 are respectively located in the first shaft tube 3 and the second shaft tube 4 and are connected with the inner walls of the two shaft tubes through sealed bearings.

[0042] A box body 6 for storing coolant is fixedly connected to the side wall surface of the reduction gearbox body 1. The box body 6 is located between the first shaft tube 3 and the second shaft tube 4. A first water pipe 9 is connected between the box body 6 and the first shaft tube 3. One end of the first water pipe 9 is communicated with the box body 6, and the other end is fixedly connected to the pipe wall of the first shaft tube 3 and is communicated with the sealed cavity 5 therein; A second water pipe 8 is connected between the pipe walls of the first shaft tube 3 and the second shaft tube 4. The second water pipe 8 surrounds the side of the reduction gearbox body 1 away from the box body 6. One end of the second water pipe 8 is fixedly connected to the pipe wall of the first shaft tube 3 and is communicated with the sealed cavity 5 inside it, and the other end is fixedly connected to the pipe wall of the second shaft tube 4 and is communicated with the sealed cavity 5 inside it; A water pump 7 is fixed on one side of the box body 6 close to the second shaft tube 4. The input end of the water pump 7 extends into the interior of the box body 6, and the output end of the water pump 7 is communicated with the sealed cavity 5 inside the pipe wall of the second shaft tube 4 through a pipeline.

[0043] In this embodiment, a flange plate 10 is fixedly connected to the end of the second shaft tube 4 away from the reduction gearbox body 1. A sealing disc 21 is fixedly connected to the flange plate 10. A plurality of third screw holes 22 corresponding to the screw holes of the flange plate 10 are opened on the sealing disc 21. The third screw holes 22 and the screw holes of the flange plate 10 are threadedly connected through second bolts 23.

[0044] During use, the sealing disc 21 is brought into contact with the flange plate 10. After contact, the third screw holes 22 opened on the sealing disc 21 are adjusted to be aligned with the screw holes on the flange plate 10. After alignment, the second bolts 23 are screwed into the third screw holes 22 and the screw holes of the flange plate 10 to fix the sealing disc 2 and the flange plate 10, thereby sealing the second shaft tube 4 and preventing water droplets from penetrating into the interior of the reduction gearbox body 1.

[0045] The utility model makes the coolant in the box body flow in the loop formed by the sealing cavity of the second shaft tube, the second water pipe, the sealing cavity of the first shaft tube and the first water pipe by using a water pump, thereby evacuating the heat generated by the rotation of the shaft rods at both ends of the universal joint inside the first shaft tube and the second shaft tube, effectively avoiding the high-temperature damage of the sealed bearing, preventing water from penetrating into the inside of the reduction gearbox, and preventing the emulsification of the engine oil inside the reduction gearbox.

Claims

1. Cooling device for the shaft of the speed reducer of an external screw pump, characterized in that, It includes a reduction gearbox body (1) with a universal joint (11) installed inside. On both sides of the reduction gearbox body (1), a first shaft tube (3) and a second shaft tube (4) that are connected to its interior are respectively fixed. The tube walls of the first shaft tube (3) and the second shaft tube (4) are hollow. The shaft rods at both ends of the universal joint (11) are respectively sleeved in the first shaft tube (3) and the second shaft tube (4) through sealed bearings. On the side wall surface of the reduction gearbox body (1) between the first shaft tube (3) and the second shaft tube (4), a box body (6) for holding coolant is fixedly connected. A water pump (7) is installed on the side of the box body (6). The output end of the water pump (7) is connected to the tube wall of the second shaft tube (4) through a pipeline. A second water pipe (8) is connected between the tube wall of the second shaft tube (4) and the tube wall of the first shaft tube (3). The second water pipe (8) surrounds the outer surface of the reduction gearbox body (1) on the side away from the box body (6). A first water pipe (9) is connected between the tube wall of the first shaft tube (3) and the box body (6).

2. The cooling device for the shaft of the speed reducer of the external transmission screw pump according to claim 1, characterized in that, A sealed cover plate (2) covers the top of the reduction gearbox body (1). An inner groove (12) is provided at the top of the side wall of the reduction gearbox body (1). A clamping groove (13) is opened inside the inner groove (12). A clamping strip (14) that is clamped with the clamping groove (13) is fixedly connected to the bottom of the sealed cover plate (2).

3. The cooling device for the shaft of the external transmission screw pump reducer according to claim 2, characterized in that, A plurality of first screw holes (15) are evenly opened at the top of the side wall of the reduction gearbox body (1). The plurality of first screw holes (15) are located outside the inner groove (12). A plurality of second screw holes (16) corresponding to the first screw holes (15) are opened on the sealed cover plate (2). A first bolt (17) is threadedly connected between the first screw hole (15) and the second screw hole (16).

4. The temperature reduction device for the shaft of the external screw pump speed reducer according to claim 2 or 3, characterized in that, An oil inlet pipe (18) is fixedly connected to the top of the sealed cover plate (2). A first sealing cover (19) is threadedly connected to the pipe orifice of the oil inlet pipe (18).

5. The temperature reduction device for the shaft of the external transmission screw pump speed reducer according to claim 1, characterized in that, An oil drain pipe (24) is fixedly connected to the bottom of the reduction gearbox body (1). A second sealing cover (20) is threadedly connected to the pipe orifice of the oil drain pipe (24).

6. The temperature reduction device for the shaft of the external transmission screw pump speed reducer according to claim 1, wherein, A flange plate (10) is fixedly connected to the end of the second shaft tube (4) away from the universal joint (11). A sealing plate (21) is hermetically fixed on the flange plate (10).

7. The temperature reduction device for the shaft of the external transmission screw pump speed reducer according to claim 6, characterized in that, A plurality of third screw holes (22) corresponding to the screw holes of the flange plate (10) are opened on the sealing plate (21). A second bolt (23) passes through the third screw hole (22) and the screw hole of the flange plate (10).

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