A main rod of a high-load-bearing three-screw pump

Abstract

The present invention discloses a main rod of a high-load-bearing three-screw pump, which relates to the technical field of three-screw pumps and comprises a pump body, wherein an active screw is arranged inside the pump body, wherein the active screw comprises a front end rod, a middle end rod is arranged at the rear end of the front end rod, and a rear end rod is arranged at the rear end of the middle end rod, a limiting block is arranged inside each of the limit grooves, a round-head T-rod is arranged inside each of the T-holes, a fixing screw is threadedly penetrated through the inner walls of the two placement grooves, and a round-head rod is arranged inside the cylindrical groove. The present invention can effectively save costs by arranging a segmented disassembly and assembly mode of the active screw, and at the same time, by arranging the cooperation of the T-hole, the round-head T-rod, the spring, the cylindrical groove, the fixing screw and the round-head rod, the rod composed of the front end rod, the middle end rod and the rear end rod can be quickly moved out from the inside of the pump, i.e., the utilization efficiency of the active screw of the three-screw pump is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of three-screw pumps, in particular to a main rod of a three-screw pump with high load-bearing capacity. Background Art

[0002] The three-screw pump is a device used for liquid transportation. It has the largest output among screw pumps and is a common positive displacement rotor pump. The three-screw pump is mainly composed of an active screw connected to the motor and two driven screws matched with it and a pump sleeve fixed in the pump body. The three screws meshing with each other form a sealed cavity in the pump sleeve according to each lead, which creates a seal between the suction and discharge ports. As the screws rotate and mesh, these sealed spaces are continuously formed at the suction port of the pump, sealing the medium entering the suction port, and continuously moving it axially from the suction port to the discharge end, and continuously discharging the medium enclosed in each space. From the principle of the three-screw pump, it can be seen that the flow rate of the pump is stable, the medium does not form vortexes, and it is insensitive to the viscosity of the medium, and it can transport high-viscosity media.

[0003] In actual use, the main rod of the existing engineering three-screw pump can cooperate with other components inside the pump to realize the liquid conveying function of the three-screw pump. However, the main rod of the existing three-screw pump is mostly an integral whole and cannot be disassembled and assembled in sections. That is, once a certain position of the three-screw pump is damaged, the entire main rod needs to be replaced, which increases the cost and reduces the efficiency of use.

[0004] Therefore, we propose a main rod of a high-load-bearing three-screw pump in order to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a main rod of a three-screw pump with high load-bearing capacity, so as to solve the problem that the main rod of the existing engineering three-screw pump is an integral whole and cannot be disassembled and assembled in sections, that is, once a certain position of the three-screw pump is damaged, the entire main rod needs to be replaced, which increases the cost and reduces the utilization efficiency.

[0006] To achieve the above object, the present invention provides the following technical solution: a main rod of a high-load-bearing three-screw pump, comprising a pump body, wherein an active screw is arranged inside the pump body;

[0007] The active screw comprises a front end rod, a middle end rod is arranged at the rear end of the front end rod, a rear end rod is arranged at the rear end of the middle end rod, a rectangular groove is provided at the rear end of the front end rod, a rectangular column is arranged inside the rectangular groove, the surface of the front end rod, the surface of the middle end rod and the surface of the rear end rod are all provided with mounting grooves, the inner wall of each mounting groove is provided with a rectangular hole, four limiting grooves are arranged on both sides of the rectangular column, a limiting block is arranged inside each limiting groove, a fixing bolt is threadedly sleeved inside each mounting groove, a sealing plug is arranged inside each mounting groove, a first circular ring block is arranged on the outer surface of the rear end rod, a second circular ring block is arranged on the outer surface of the rear end rod, a cylindrical groove is provided on the surface of the rear end rod, three groups of T-shaped holes are provided on the inner wall of the cylindrical groove, a round head T-shaped rod is arranged inside each of the T-shaped holes, a spring is installed on the surface of each of the round head T-shaped rods, two placement grooves are provided on the surface of the rear end rod, fixing screws are threaded through the inner walls of the two placement grooves, and a round head rod is arranged inside the cylindrical groove.

[0008] Preferably, one end of the rectangular column movably passes through the front end of the middle end rod, and one end of the rectangular column is slidably embedded in the front end of the rear end rod. The number of mounting grooves on the front end rod and the rear end rod is two, and the number of mounting grooves on the middle end rod is four. The front end of each limit block is respectively located inside each rectangular hole, so that the limit block can be installed inside the corresponding limit groove under the cooperation of the rectangular hole and the mounting groove, and the corresponding rod can be prevented from falling off from the rectangular column under the action of the limit block.

[0009] Preferably, one end of each of the fixing bolts is in contact with the surface of each limit block, and the number of each group of T-holes is two. One end of each of the springs is installed on the inner wall of each T-hole, so that with the cooperation of the spring and the T-hole, one end of the corresponding round-headed T-rod can be quickly moved back to the inside of the corresponding T-hole.

[0010] Preferably, one end of the two fixing screws are threadedly connected to the surface of the round head rod, and the round head end of each round head T-rod is in contact with the surface of the round head rod, so that the round head T-rod can be prevented from moving inside the corresponding T-hole under the action of the round head rod.

[0011] Preferably, the six round-headed T-rods are divided into three groups, one end of two groups of the round-headed T-rods are slidably embedded in the inner wall of the second circular ring block, and one end of the other group of the round-headed T-rods is slidably embedded in the inner wall of the first circular ring block, so that under the action of the round-headed T-rods, the first circular ring block and the second circular ring block can be prevented from detaching from the rear end rod.

[0012] Preferably, a safety valve is provided on the pump body, a pump sleeve is installed inside the pump body, the active screw is inside the pump sleeve, two driven screws are installed inside the pump sleeve, and a balancing cylinder sleeve is installed at the front end of the two driven screws. A front cover is installed at the front end of the pump body, and a bearing seat is installed on the surface of the front cover, so that the shaft on which the bearing body is installed can be more stable when working with a retaining ring under the action of the bearing seat.

[0013] Preferably, a bearing body is installed inside the bearing seat, a shaft retaining ring is installed at the front end of the bearing body, a mechanical seal body is installed at the front end of the shaft retaining ring, and mechanical seal seats are installed at the front ends of the bearing seat and the mechanical seal body, so that the sealing between the pump body and the active screw can be improved under the action of the mechanical seal seat.

[0014] Preferably, a flat key groove is provided at the front end of the active screw, oil-resistant asbestos pads are provided between the pump body, front cover, bearing seat and mechanical seal seat, a mechanical seal cover is installed at the front end of the bearing seat, an O-ring is installed at the front end of the mechanical seal cover, and a rear cover is installed at the rear end of the pump body, so that the rod consisting of the front end rod, middle end rod and rear end rod can be quickly taken out from the inside of the pump body under the action of the rear cover.

[0015] Preferably, the two driven screws are meshedly connected with the active screw, the pump sleeve and the balance cylinder sleeve are connected with the front cover, the front cover cooperates with the active screw, the bearing body cooperates with the active screw, and the mechanical seal body is installed on the mechanical seal cover, so that the mechanical seal body can be protected under the action of the mechanical seal cover.

[0016] Preferably, the balancing cylinder sleeve is used to fix the driven screw and is connected to the pump sleeve and the front cover. The O-ring cooperates with the mechanical seal body. The upper and lower parts of the pump body are provided with screw plug holes. A screw plug body is installed inside each of the screw plug holes, so that the medium inside the pump body can be prevented from flowing out of the screw plug hole under the action of the screw plug body.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention can effectively save costs by arranging a segmented disassembly and assembly mode of the active screw. At the same time, by arranging the cooperation of the T-shaped hole, the round-headed T-shaped rod, the spring, the cylindrical groove, the fixing screw and the round-headed rod, the rod composed of the front-end rod, the middle-end rod and the rear-end rod can be quickly moved out from the inside of the pump, that is, the use efficiency of the active screw of the three-screw pump is effectively improved. Under the action of the rectangular groove, the installation of the rectangular column can be facilitated. Under the cooperation of the rectangular column and the limit block, the front-end rod, the middle-end rod and the rear-end rod can be connected together. Under the action of the installation groove, it is convenient for the fixing bolt to squeeze and fix the limit block. It is stably fixed inside the corresponding limit groove. Under the action of the limit block, the corresponding rod can be prevented from detaching from the rectangular column. Under the action of the fixing bolt, the corresponding limit block can be prevented from passing through the inside of the rectangular hole, thereby causing the limit block to slide out of the corresponding limit groove. Under the action of the sealing plug, the fixing bolt in the corresponding installation groove can be protected. With the cooperation of the cylindrical groove, the round head rod and the fixing screw, the spring can be prevented from causing the round head T-rod to move, thereby effectively preventing the first circular ring block and the second circular ring block from detaching from the rear end rod.

[0019] 2. The present invention can increase the pump body leakage threshold pressure to a certain extent, improve the pump body performance, increase the service life of the pump body, and save the use cost of the three-screw pump by arranging the pump body, front cover, bearing seat, mechanical seal end cover, mechanical seal body, bearing body, pump sleeve, balance cylinder sleeve, driven screw and active screw. With the cooperation of the O-ring and the mechanical seal body, the sealing effect of the three-screw body can be improved. Under the action of the screw plug body, the medium inside the pump body can be prevented from flowing out of the screw plug hole. Under the action of the flat keyway, the active screw is convenient for connection operation with the coupling prepared by the staff. Under the action of the oil-resistant asbestos pad, the sealing effect between the components can be improved. Under the action of the safety valve, the three-screw pump can be prevented from being damaged by overload due to excessive discharge pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of a schematic diagram of the assembly structure of a main rod of a high-load-bearing three-screw pump of the present invention;

[0021] Figure 2 This is a schematic structural diagram of a main rod of a high-load-bearing three-screw pump of the present invention before improvement;

[0022] Figure 3 This is a schematic diagram of a novel active screw structure of a main rod of a high-load-bearing three-screw pump of the present invention;

[0023] Figure 4 A three-dimensional view of an active screw of a main rod of a high-load-bearing three-screw pump of the present invention from another angle;

[0024] Figure 5This is a three-dimensional diagram of the active screw portion of the main rod of a high-load-bearing three-screw pump of the present invention;

[0025] Figure 6 It is a sectional stereoscopic view of the active screw portion of the main rod of a high-load-bearing three-screw pump of the present invention;

[0026] Figure 7 It is a three-dimensional structural schematic diagram of a front end rod, a rectangular groove, a mounting groove and a rectangular hole of a main rod of a high-load-bearing three-screw pump of the present invention.

[0027] In the figure: 8, pump body; 10, front cover; 11, oil-resistant asbestos pad; 12, safety valve; 13, bearing seat; 15, O-ring; 16, flat keyway; 17, mechanical seal cover; 18, mechanical seal body; 20, mechanical seal seat; 22, shaft retaining ring; 23, bearing body; 24, screw plug hole; 25, screw plug body; 26, pump sleeve; 27, balance cylinder sleeve; 32, rear cover; 34, driven screw;

[0028] 35. Active screw; 3501. Front end rod; 3502. Middle end rod; 3503. Rear end rod; 3504. Rectangular groove; 3505. Rectangular column; 3506. Mounting groove; 3507. Rectangular hole; 3508. Limit groove; 3509. Limit block; 3510. Sealing plug; 3511. Fixing bolt; 3512. First circular ring block; 3513. Second circular ring block; 3514. T-hole; 3515. Round head T-rod; 3516. Spring; 3517. Cylindrical groove; 3518. Placement groove; 3519. Fixing screw; 3520. Round head rod. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 7 As shown, the present invention provides a technical solution: a main rod of a high-load-bearing three-screw pump, comprising a pump body 8, wherein an active screw 35 is arranged inside the pump body 8;

[0031] The active screw rod 35 includes a front end rod 3501, a middle end rod 3502 is provided at the rear end of the front end rod 3501, a rear end rod 3503 is provided at the rear end of the middle end rod 3502, a rectangular groove 3504 is provided at the rear end of the front end rod 3501, a rectangular column 3505 is provided inside the rectangular groove 3504, a mounting groove 3506 is provided on the surface of the front end rod 3501, the surface of the middle end rod 3502 and the surface of the rear end rod 3503, a rectangular hole 3507 is provided on the inner wall of each mounting groove 3506, four limiting grooves 3508 are provided on both sides of the rectangular column 3505, a limiting block 3509 is provided inside each limiting groove 3508, and a fixing bolt 3506 is threadedly sleeved inside each mounting groove 3506 11. A sealing plug 3510 is provided inside each mounting groove 3506, a first circular block 3512 is provided on the outer surface of the rear end rod 3503, a second circular block 3513 is provided on the outer surface of the rear end rod 3503, a cylindrical groove 3517 is provided on the surface of the rear end rod 3503, three groups of T-shaped holes 3514 are provided on the inner wall of the cylindrical groove 3517, a round-headed T-shaped rod 3515 is provided inside each T-shaped hole 3514, a spring 3516 is installed on the surface of each round-headed T-shaped rod 3515, two placement grooves 3518 are provided on the surface of the rear end rod 3503, fixing screws 3519 are threaded through the inner walls of the two placement grooves 3518, and a round-headed rod 3520 is provided inside the cylindrical groove 3517.

[0032] according to Figure 4-Figure 7 As shown, one end of the rectangular column 3505 is movably inserted through the front end of the middle end rod 3502, and one end of the rectangular column 3505 is slidably embedded in the front end of the rear end rod 3503. The number of mounting grooves 3506 on the front end rod 3501 and the rear end rod 3503 is two, and the number of mounting grooves 3506 on the middle end rod 3502 is four. The front end of each limit block 3509 is respectively located inside each rectangular hole 3507, so that the limit block 3509 can be installed inside the corresponding limit groove 3508 under the cooperation of the rectangular hole 3507 and the mounting groove 3506, so that the corresponding rod can be prevented from detaching from the rectangular column 3505 under the action of the limit block 3509.

[0033] according to Figure 5 and Figure 6 As shown, one end of each fixing bolt 3511 is in contact with the surface of each limit block 3509 respectively, the number of each group of T-holes 3514 is two, and one end of each spring 3516 is installed on the inner wall of each T-hole 3514 respectively, so that with the cooperation of the spring 3516 and the T-hole 3514, one end of the corresponding round-head T-rod 3515 can be quickly moved back to the inside of the corresponding T-hole 3514.

[0034] according to Figure 5 and Figure 6As shown, one end of the two fixing screws 3519 is threadedly connected to the surface of the round head rod 3520, and the round head end of each round head T-shaped rod 3515 is in contact with the surface of the round head rod 3520, so that under the action of the round head rod 3520, the round head T-shaped rod 3515 can be prevented from moving inside the corresponding T-shaped hole 3514.

[0035] according to Figure 5 and Figure 6 As shown, the six round-headed T-shaped rods 3515 are divided into three groups, one end of two groups of round-headed T-shaped rods 3515 are slidably embedded in the inner wall of the second circular ring block 3513, and one end of the other group of round-headed T-shaped rods 3515 are slidably embedded in the inner wall of the first circular ring block 3512, so that under the action of the round-headed T-shaped rods 3515, the first circular ring block 3512 and the second circular ring block 3513 can be prevented from detaching from the rear end rod 3503.

[0036] according to Figure 1-Figure 3 As shown, a safety valve 12 is provided on the pump body 8, a pump sleeve 26 is installed inside the pump body 8, a driving screw 35 is inside the pump sleeve 26, two driven screws 34 are installed inside the pump sleeve 26, and a balancing cylinder sleeve 27 is installed at the front end of the two driven screws 34. A front cover 10 is installed at the front end of the pump body 8, and a bearing seat 13 is installed on the surface of the front cover 10, so that the shaft on which the bearing body 23 is installed can be more stable when working with a retaining ring 22 under the action of the bearing seat 13.

[0037] according to Figure 1 As shown, a bearing body 23 is installed inside the bearing seat 13, a shaft retaining ring 22 is installed at the front end of the bearing body 23, a mechanical seal body 18 is installed at the front end of the shaft retaining ring 22, and a mechanical seal seat 20 is installed at the front end of the bearing seat 13 and the front end of the mechanical seal body 18, so that the sealing between the pump body 8 and the active screw 35 can be improved under the action of the mechanical seal seat 20.

[0038] according to Figure 1-Figure 3 As shown, a flat key groove 16 is provided at the front end of the active screw 35, and oil-resistant asbestos pads 11 are provided between the pump body 8, the front cover 10, the bearing seat 13, and the mechanical seal seat 20. A mechanical seal cover 17 is installed at the front end of the bearing seat 13, and an O-ring 15 is installed at the front end of the mechanical seal cover 17. A rear cover 32 is installed at the rear end of the pump body 8, so that the rod composed of the front end rod 3501, the middle end rod 3502 and the rear end rod 3503 can be quickly taken out from the inside of the pump body 8 under the action of the rear cover 32.

[0039] according to Figure 1-Figure 3As shown, the two driven screws 34 are meshed and connected with the active screw 35, the pump sleeve 26 and the balance cylinder sleeve 27 are connected with the front cover 10, the front cover 10 cooperates with the active screw 35, the bearing body 23 cooperates with the active screw 35, and the mechanical seal body 18 is installed on the mechanical seal cover 17, so that the mechanical seal body 18 can be protected under the action of the mechanical seal cover 17.

[0040] according to Figure 1 As shown, the balancing cylinder sleeve 27 is used to fix the driven screw 34, and is connected to the pump sleeve 26 and the front cover 10. The O-ring 15 cooperates with the mechanical seal body 18. The upper and lower parts of the pump body 8 are provided with screw plug holes 24, and a screw plug body 25 is installed inside each screw plug hole 24. Under the action of the screw plug body 25, the medium inside the pump body 8 can be prevented from flowing out of the screw plug hole 24.

[0041] The effect achieved by the entire mechanism is: when the three-screw pump needs to be used, the three-screw pump is first connected to the external motor through the coupling prepared by the staff, and then the external motor is started. At this time, the started external motor will directly drive the active screw 35 with the cooperation of the coupling. At this time, the started active screw 35 directly drives the two driven screws 34 meshing with it to rotate. At this time, with the cooperation of the active screw 35, the driven screw 34, the O-ring 15, the mechanical seal body 18 and the pump sleeve 26, the space between the suction port and the discharge port of the three-screw pump is directly divided into one or more sealed spaces. When the active screw 35 and the driven screw 34 are continuously rotating, the space between the suction port and the discharge port of the three-screw pump will not be It is continuously formed, and then the liquid in the suction chamber is sealed therein. When the liquid enters the interior, the liquid entering the interior will be directly pushed along the axial direction of the active screw 35 and the driven screw 34 to the discharge port of the three-screw pump, that is, the liquid enclosed in each space is continuously discharged, thereby achieving the liquid delivery operation. The use of the mechanical seal body 18 matched therewith can greatly increase the pressure that the pump body 8 can bear, so that the use of the same type of three-screw pump can be applied to more complex working conditions, saving research costs, greatly reducing the use cost of the three-screw pump, and increasing the service life of the pump body 8. When it is necessary to remove the rod composed of the front end rod 3501, the middle end rod 3502 and the rear end rod 3503 from the inside of the pump body 8 When taking it out quickly, first remove the rear cover 32, then remove the two fixing screws 3519, and then pour the round-headed rod 3520 out of the cylindrical groove 3517 opened on the rear end rod 3503. When the round-headed rod 3520 begins to move out from the inside of the cylindrical groove 3517, the round-headed T-shaped rod 3515 inside each T-shaped hole 3514 will be directly moved back to the inside of the corresponding T-shaped hole 3514 under the action of the corresponding spring 3516. When all the round-headed T-shaped rods 3515 are moved back to the inside of the corresponding T-shaped hole 3514, the rod directly composed of the front end rod 3501, the middle end rod 3502 and the rear end rod 3503 can be quickly moved out from the inside of the pump body 8. When it is necessary to replace any one of the front end rod 3501, the middle end rod 3502 and the rear end rod 3503 in the active screw rod 35, first remove the active screw rod 35 from the inside of the pump body 8, then remove the sealing plug 3510 installed on the corresponding rod, and then let the staff use tools to remove the fixing bolt 3511 on the corresponding rod from the inside of the corresponding installation groove 3506. After the fixing bolt 3511 in the corresponding installation groove 3506 is taken out, directly take out the limiting block 3509 in the rectangular hole 3507 connected to each installation groove 3506 from the inside of the corresponding limiting groove 3508, and then any one of the front end rod 3501, the middle end rod 3502 and the rear end rod 3503 that needs to be replaced can be removed.That is, by adding a segmented disassembly and assembly method to the active screw 35, costs can be saved, thereby effectively improving the use efficiency of the active screw 35 of the three-screw pump.

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A main rod of a high-load-bearing three-screw pump, comprising a pump body (8), characterized in that: An active screw (35) is disposed inside the pump body (8); The active screw rod (35) comprises a front end rod (3501), a middle end rod (3502) is arranged at the rear end of the front end rod (3501), a rear end rod (3503) is arranged at the rear end of the middle end rod (3502), a rectangular groove (3504) is opened at the rear end of the front end rod (3501), a rectangular column (3505) is arranged inside the rectangular groove (3504), and the surface of the front end rod (3501), the surface of the middle end rod (3502) and the rear end rod (3503) are The surface of each of the mounting grooves (3506) is provided with a mounting groove (3506), the inner wall of each of the mounting grooves (3506) is provided with a rectangular hole (3507), four limiting grooves (3508) are provided on both sides of the rectangular column (3505), a limiting block (3509) is provided inside each of the limiting grooves (3508), a fixing bolt (3511) is threadedly sleeved inside each of the mounting grooves (3506), and a The sealing plug (3510) comprises a first annular block (3512) on the outer surface of the side of the rear end rod (3503) close to the mounting groove (3506), a second annular block (3513) on the outer surface of the side of the rear end rod (3503) away from the mounting groove (3506), a cylindrical groove (3517) on the side of the rear end rod (3503) away from the mounting groove (3506), and three groups of T-shaped holes (3514) on the inner wall of the cylindrical groove (3517), each having a plurality of T-shaped holes (3514). Each of the T-shaped holes (3514) is provided with a round-headed T-shaped rod (3515), and a spring (3516) is installed on the surface of each of the round-headed T-shaped rods (3515). Two placement grooves (3518) are provided on the surface of the rear end rod (3503) away from the installation groove (3506), and the inner walls of the two placement grooves (3518) are threaded with fixing screws (3519), and a round-headed rod (3520) is provided inside the cylindrical groove (3517); One end of the rectangular column (3505) movably passes through the front end of the middle end rod (3502), and one end of the rectangular column (3505) is slidably embedded in the front end of the rear end rod (3503). The number of mounting grooves (3506) on the front end rod (3501) and the rear end rod (3503) is two, and the number of mounting grooves (3506) on the middle end rod (3502) is four. The front end of each of the limit blocks (3509) is located inside each rectangular hole (3507). One end of each fixing bolt (3511) is in contact with the surface of each limiting block (3509), the number of each group of T-shaped holes (3514) is two, and one end of each spring (3516) is installed on the inner wall of each T-shaped hole (3514); One end of the two fixing screws (3519) is threadedly connected to the surface of the round head rod (3520), and the round head end of each round head T-shaped rod (3515) is in contact with the surface of the round head rod (3520); The six round-headed T-shaped rods (3515) are divided into three groups, wherein one end of two groups of the round-headed T-shaped rods (3515) are slidably embedded in the inner wall of the second circular ring block (3513), and one end of the other group of the round-headed T-shaped rods (3515) is slidably embedded in the inner wall of the first circular ring block (3512).

2. The main rod of the high-load-bearing three-screw pump according to claim 1 is characterized in that: The pump body (8) is provided with a safety valve (12), a pump sleeve (26) is installed inside the pump body (8), the active screw (35) is located inside the pump sleeve (26), two driven screws (34) are installed inside the pump sleeve (26), and the front ends of the two driven screws (34) are both installed with a balancing cylinder sleeve (27), and a front cover (10) is installed at the front end of the pump body (8), and a bearing seat (13) is installed on the surface of the front cover (10).

3. The main rod of the high-load-bearing three-screw pump according to claim 2 is characterized in that: A bearing body (23) is installed inside the bearing seat (13), a shaft retaining ring (22) is installed at the front end of the bearing body (23), a mechanical seal body (18) is installed at the front end of the shaft retaining ring (22), and a mechanical seal seat (20) is installed at the front end of the bearing seat (13) and the front end of the mechanical seal body (18).

4. The main rod of the high-load-bearing three-screw pump according to claim 3 is characterized in that: A flat keyway (16) is provided at the front end of the active screw (35); an oil-resistant asbestos pad (11) is provided between the pump body (8), the front cover (10), the bearing seat (13), and the mechanical seal seat (20); a mechanical seal cover (17) is installed at the front end of the bearing seat (13); an O-ring (15) is installed at the front end of the mechanical seal cover (17); and a rear cover (32) is installed at the rear end of the pump body (8).

5. The main rod of the high-load-bearing three-screw pump according to claim 4, characterized in that: The two driven screw rods (34) are meshedly connected with the driving screw rod (35), the pump sleeve (26) and the balance cylinder sleeve (27) are connected with the front cover (10), the front cover (10) is matched with the driving screw rod (35), the bearing body (23) is matched with the driving screw rod (35), and the mechanical seal body (18) is installed on the mechanical seal cover (17).

6. The main rod of the high-load-bearing three-screw pump according to claim 5, characterized in that: The balancing cylinder sleeve (27) is used to fix the driven screw (34) and is connected to the pump sleeve (26) and the front cover (10). The O-ring (15) cooperates with the mechanical seal body (18). The upper and lower parts of the pump body (8) are provided with screw plug holes (24), and a screw plug body (25) is installed inside each of the screw plug holes (24).

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