Chemical centrifugal pump with closed coupling

Abstract

The application relates to the technical field of couplings, in particular to a chemical centrifugal pump with a closed coupling, which comprises a pump body motor, a centrifugal pump cavity, a bearing box, a closed coupling bin, a bin wall rotating shaft, a driven disc, a friction ring table and a locking sliding groove; the centrifugal pump cavity is fixedly arranged with the bearing box; the pump body motor is transmissionally installed with the bearing box through the closed coupling bin; the closed coupling bin is a cylindrical cavity structure; a round hole is arranged on one side of the closed coupling bin facing the bearing box; the bin wall rotating shaft is airtightly rotationally arranged in the round hole; and a driven disc is fixedly arranged on one end of the bin wall rotating shaft located in the closed coupling bin. The chemical centrifugal pump with the closed coupling can realize the soft connection of the friction drive in the initial stage of the pump body motor starting through the cooperation of the extrusion driving mechanism arranged in the closed coupling bin and the friction ring table and other structures, and can automatically switch to the rigid connection of the locking when the rotating speed of the impeller in the centrifugal pump cavity increases.

Description

Technical Field

[0001] The invention relates to the technical field of couplings, in particular to a chemical centrifugal pump with a closed coupling. Background Art

[0002] A chemical centrifugal pump is a centrifugal pump used in the chemical industry. Its working principle is that when the pump is filled with water, the impeller rotates to generate centrifugal force. Under the action of centrifugal force, the water in the impeller groove is thrown to the periphery and flows into the pump casing. As a result, the pressure at the center of the impeller decreases. This pressure is lower than the pressure in the water inlet pipe. Under the action of this pressure difference, water flows from the suction sump into the impeller. Chemical centrifugal pumps in the prior art, such as a chemical centrifugal pump with publication number CN202251036U, describe a chemical centrifugal pump comprising a flat base, a pump body, a suspension body, a motor, and a support device. The motor, suspension body, and pump body must be at the same center height. The support device is a support foot symmetrically mounted on both sides of the pump body. The upper end of the support foot is connected to a support block provided on the pump body by a nut. According to the drawings and description of the above patent, the transmission between the pump body and the motor is connected by a coupling. The couplings used in chemical centrifugal pumps in the conventional art are all rigid hard connections. When the motor is started, the load is large, and the impact on the impeller and pump body and other structures is greater at the moment of startup, which affects the overall life of the centrifugal pump. Summary of the Invention

[0003] The object of the present invention is to provide a chemical centrifugal pump with a closed coupling to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a chemical centrifugal pump with a closed coupling, comprising a pump body motor, a centrifugal pump chamber, a bearing box, a closed coupling bin, a bin wall rotating shaft, a driven plate, a friction ring and a locking slide, wherein the centrifugal pump chamber is fixedly arranged with the bearing box, and the pump body motor is installed with the bearing box through the closed coupling bin, the closed coupling bin is a cylindrical cavity structure, a circular hole is opened on the side of the closed coupling bin facing the bearing box, a bin wall rotating shaft is arranged in an airtight manner in the circular hole, and the bin wall rotating shaft is positioned at the bottom of the closed coupling bin. A driven disc is fixedly provided at one end inside the closed coupling bin, and a friction ring is fixedly provided on the surface of the driven disc away from the bin wall rotating shaft. Locking grooves are symmetrically provided inside the friction ring. An extrusion drive mechanism with an elastic compensation function is provided inside and outside the closed coupling bin. The extrusion drive mechanism is in friction contact with the friction ring. A centrifugal locking mechanism is provided inside and outside the locking groove. The centrifugal locking mechanism has a quick triggering function. After the centrifugal locking mechanism is triggered, it can cooperate with the extrusion drive mechanism to lock.

[0005] A secondary trigger structure is provided inside and outside the warehouse wall rotating shaft and the driven disk, and the position and number of the secondary trigger structure correspond to those of the locking sliding grooves.

[0006] The extrusion drive mechanism includes a limiting activity chamber, a limiting convex ring, an axial push column and a blocking stop ring. The limiting activity chamber is coaxially fixed with the closed coupling bin. A limiting convex ring is fixed between the limiting activity chamber and the closed coupling bin. An axial push column is inserted into the limiting convex ring. A blocking stop ring is fixed at one end of the axial push column located inside the limiting activity chamber.

[0007] A ridge limiting groove is provided on the inner wall surface of the limiting convex ring, a push column ridge is fixedly provided on the outer surface of the axial push column, and the push column ridge is slidably provided inside the ridge limiting groove, and a driving pressure plate is fixedly provided at one end of the axial push column located inside the closed coupling bin.

[0008] A locking friction protrusion is fixedly provided on the side of the driving pressure plate away from the axial push column. The locking friction protrusions are evenly distributed in a circular array. The locking friction protrusions are in friction contact with the friction ring. A compensating extrusion spring is installed on the outer sleeve of the axial push column. The compensating extrusion spring is clamped between the driving pressure plate and the limiting protrusion.

[0009] The centrifugal locking mechanism includes a connecting groove plate, a locking plate, a fixed vertical plate and a magnetic sheet. The connecting groove plate is slidably arranged inside the locking groove, a locking plate is fixedly arranged at one end of the connecting groove plate, the locking plate is located inside the ring center of the friction ring table, a fixed vertical plate is fixedly arranged on the surface of the locking plate on the side away from the connecting groove plate, and a magnetic sheet is fixedly arranged on the surface of the fixed vertical plate.

[0010] A centrifugal counterweight is fixedly provided at one end of the connecting groove plate away from the locking plate, a track positioning frame is fixedly provided on the outer surface of the friction ring platform, the centrifugal counterweight is limitedly provided inside the track positioning frame, a reset push spring is embedded and fixed on the surface of the centrifugal counterweight, and the other end of the reset push spring is in compression contact with the inner wall surface of the track positioning frame.

[0011] The secondary trigger structure includes a pressure-sensitive slot, a pressure-driven chamber, an anti-slip convex ring and an airtight piston disc. The pressure-sensitive slot is opened inside the warehouse wall rotating shaft and the driven disc, and the pressure-sensitive slot passes through the side facing the friction ring platform. The inner wall surface of the pressure-sensitive slot is symmetrically provided with a pressure-driven chamber, and the axis of the pressure-driven chamber is parallel to the length direction of the locking slide groove. The anti-slip convex ring is fixedly provided on the inner wall surface of the pressure-driven chamber near the pressure-sensitive slot, and the interior of the pressure-driven chamber is airtightly provided with an airtight piston disc.

[0012] A trigger top shaft is fixedly provided on the surface of the airtight piston disc, a top shaft through-cavity is opened inside the driven disc, the trigger top shaft passes through the top shaft through-cavity, a vertical matching plate is fixedly provided on the surface of the centrifugal counterweight block, the vertical matching plate and the trigger top shaft correspond to each other, a pressure-equalizing interactive air path is opened inside the warehouse wall rotating shaft, one end of the pressure-equalizing interactive air path is connected to the pressure driving cavity, and the other end of the pressure-equalizing interactive air path is connected to the outside world, a calibration tension spring is connected between the two groups of airtight piston discs, and the calibration tension spring is in a stretched state.

[0013] A thrust ball bearing is embedded in the inner wall surface of the closed coupling bin, and the thrust ball bearing is in squeeze contact with the driven disc. A coupling clamping sleeve is fixedly provided at the end of the bin wall rotating shaft and the limit activity chamber respectively.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The chemical centrifugal pump of the present invention has a closed coupling. Through the cooperation of the extrusion drive mechanism provided in the closed coupling chamber and the friction ring and other structures, it can be a friction-driven soft connection at the initial stage of starting the pump motor. When the impeller speed in the centrifugal pump chamber increases, it automatically switches to a locked rigid connection, thereby reducing the starting load of the pump motor at startup, reducing the impact on the pump body, and extending the life of the pump body parts; during operation, the locked rigid connection can maintain high transmission efficiency; and through the cooperation of the provided magnetic suction plate and other structures, the locking plate can be quickly triggered when the rigid connection is switched, reducing the impact damage to the locking plate.

[0016] By setting up a two-stage trigger structure, when the rotational resistance of the drive shaft in the bearing box is large and the locking friction protrusion cannot drive the friction ring to rotate by friction, the locking friction protrusion and the friction ring will rub against each other. When the heat reaches a certain level, the centrifugal counterweight block is driven to move by the change in air pressure, so that the locking friction protrusion and the friction ring are switched to a locked rigid connection, and a hard start is performed, thereby avoiding excessive wear between the locking friction protrusion and the friction ring, and avoiding affecting the starting performance of the chemical centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic cross-sectional view of the closed coupling bin of the present invention.

[0019] Figure 3 This is a cutaway front view of the closed coupling bin of the present invention.

[0020] Figure 4 It is a three-dimensional half-section schematic diagram of the closed coupling bin of the present invention.

[0021] Figure 5 for Figure 4 Enlarged schematic diagram of area A in the middle.

[0022] Figure 6 This is a three-dimensional half-section front view of the closed coupling bin of the present invention.

[0023] Figure 7 It is a horizontal half-section schematic diagram of the closed coupling bin of the present invention.

[0024] Figure 8 This is a schematic diagram of the separation of the components of the closed coupling bin of the present invention.

[0025] Figure 9 This is a schematic diagram showing the separation of the components of the closed coupling bin according to the present invention from another angle.

[0026] Figure 10 It is a three-dimensional half-section schematic diagram of the separated parts of the closed coupling bin of the present invention.

[0027] Figure: 1, pump motor; 2, centrifugal pump chamber; 3, bearing box; 4, closed coupling chamber; 5, chamber wall shaft; 6, driven plate; 7, friction ring; 8, locking slide; 401, limit movable chamber; 402, limit convex ring; 403, shaft-driven push column; 404, blocking ring; 405, convex ridge limit groove; 406, push column convex ridge; 407, driving pressure plate; 408, compensating extrusion spring; 409, locking friction convex block; 801, connecting slot plate; 802 , locking plate; 803, fixed vertical plate; 804, magnetic sheet; 805, centrifugal weight; 806, track positioning frame; 807, reset spring; 501, pressure-sensing slot; 502, pressure-driven chamber; 503, anti-slip convex ring; 504, airtight piston disc; 505, triggering top shaft; 506, top shaft through chamber; 507, vertical matching plate; 508, pressure-equalizing interactive air path; 509, calibration tension spring; 410, thrust ball bearing; 510, coupling clamping sleeve. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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 making creative efforts are within the scope of protection of the present invention.

[0029] See also Figures 1 to 10The present invention provides a technical solution: a chemical centrifugal pump with a closed coupling, comprising a pump body motor 1, a centrifugal pump chamber 2, a bearing box 3, a closed coupling chamber 4, a chamber wall rotating shaft 5, a driven plate 6, a friction ring platform 7 and a locking slide 8. The centrifugal pump chamber 2 and the bearing box 3 are fixedly arranged, and the pump body motor 1 is installed with the bearing box 3 through the closed coupling chamber 4. The closed coupling chamber 4 is a cylindrical cavity structure. A circular hole is opened on the side of the closed coupling chamber 4 facing the bearing box 3. The chamber wall rotating shaft 5 is airtightly rotated in the circular hole. A driven disc 6 is fixedly mounted at one end of the closed coupling chamber 4. A friction ring platform 7 is fixedly mounted on the surface of the driven disc 6 on the side away from the chamber wall rotating shaft 5. Locking chutes 8 are symmetrically arranged inside the friction ring platform 7. An extrusion drive mechanism with an elastic compensation function is disposed inside and outside the closed coupling chamber 4. The extrusion drive mechanism is in frictional contact with the friction ring platform 7. A centrifugal locking mechanism is disposed inside and outside the locking chute 8. The centrifugal locking mechanism has a quick triggering function. Once triggered, it can lock in conjunction with the extrusion drive mechanism.

[0030] A secondary trigger structure is provided inside and outside the warehouse wall rotating shaft 5 and the driven disk 6 , and the position and number of the secondary trigger structure and the locking slide groove 8 correspond to each other.

[0031] The extrusion drive mechanism includes a limiting activity chamber 401, a limiting convex ring 402, an axial push column 403 and a blocking stop ring 404. The limiting activity chamber 401 is coaxially fixed with the closed coupling bin 4. The limiting convex ring 402 is fixed between the limiting activity chamber 401 and the closed coupling bin 4. The axial push column 403 is inserted into the interior of the limiting convex ring 402. A blocking stop ring 404 is fixed at one end of the axial push column 403 located inside the limiting activity chamber 401.

[0032] A ridge limiting groove 405 is provided on the inner wall surface of the limiting convex ring 402, and a push column ridge 406 is fixedly provided on the outer surface of the axial push column 403. The push column ridge 406 is slidably provided inside the ridge limiting groove 405, and a driving pressure plate 407 is fixedly provided at one end of the axial push column 403 located inside the closed coupling bin 4.

[0033] A locking friction protrusion 409 is fixedly provided on the side of the driving pressure plate 407 away from the axial push column 403. The locking friction protrusions 409 are evenly distributed in a circular array. The locking friction protrusions 409 are in friction contact with the friction ring platform 7. A compensating extrusion spring 408 is installed on the outer sleeve of the axial push column 403. The compensating extrusion spring 408 is clamped between the driving pressure plate 407 and the limiting protrusion 402.

[0034] The centrifugal locking mechanism includes a connecting groove plate 801, a locking plate 802, a fixed vertical plate 803 and a magnetic sheet 804. The connecting groove plate 801 is slidably arranged inside the locking groove 8. A locking plate 802 is fixedly arranged at one end of the connecting groove plate 801. The locking plate 802 is located inside the center of the friction ring 7. A fixed vertical plate 803 is fixedly arranged on the surface of the locking plate 802 away from the connecting groove plate 801. A magnetic sheet 804 is fixedly arranged on the surface of the fixed vertical plate 803. Figure 9 As shown in the figure, the two magnetic sheets 804 attract each other to keep the two sets of locking plates 802 attracted. When the centrifugal force overcomes the magnetic force between the two magnetic sheets 804, the two magnetic sheets 804 separate from each other, causing the magnetic force to drop sharply, which can cause the locking plate 802 to be quickly triggered and stuck in the locking slot 8.

[0035] A centrifugal counterweight 805 is fixedly provided at one end of the connecting groove plate 801 away from the locking plate 802, and a track positioning frame 806 is fixedly provided on the outer surface of the friction ring platform 7. The centrifugal counterweight 805 is limitedly provided inside the track positioning frame 806, and a reset push spring 807 is embedded and fixed on the surface of the centrifugal counterweight 805. The other end of the reset push spring 807 is in compression contact with the inner wall surface of the track positioning frame 806.

[0036] The secondary trigger structure includes a pressure-sensing slot 501, a pressure-driving chamber 502, an anti-slip convex ring 503 and an airtight piston disc 504. The pressure-sensing slot 501 is opened inside the warehouse wall rotating shaft 5 and the driven disc 6. The pressure-sensing slot 501 passes through the side facing the friction ring platform 7. The pressure-sensing slot 501 is symmetrically provided with a pressure-driving chamber 502 on the inner wall surface. The axis of the pressure-driving chamber 502 is parallel to the length direction of the locking groove 8. The anti-slip convex ring 503 is fixedly provided on the inner wall surface of the pressure-sensing slot 501, and the interior of the pressure-driving chamber 502 is airtightly provided with an airtight piston disc 504.

[0037] A trigger top shaft 505 is fixedly provided on the surface of the airtight piston disc 504, and a top shaft through cavity 506 is opened inside the driven disc 6, and the trigger top shaft 505 passes through the top shaft through cavity 506, and the trigger top shaft 505 and the top shaft through cavity 506 are airtightly slidably matched. A vertical matching plate 507 is fixedly provided on the surface of the centrifugal counterweight block 805, and the vertical matching plate 507 corresponds to the trigger top shaft 505. A pressure-equalizing interactive air path 508 is opened inside the warehouse wall rotating shaft 5, and one end of the pressure-equalizing interactive air path 508 is connected to the pressure driving cavity 502, and the other end of the pressure-equalizing interactive air path 508 is connected to the outside world. The pressure-equalizing interactive air path 508 is connected to the outside world to ensure the movement of the airtight piston disc 504. A calibration tension spring 509 is connected between the two groups of airtight piston discs 504, and the calibration tension spring 509 is in a stretched state.

[0038] A thrust ball bearing 410 is embedded in the inner wall surface of the closed coupling bin 4 , and the thrust ball bearing 410 is in squeeze contact with the driven disc 6 . A coupling clamping sleeve 510 is fixed to the ends of the bin wall rotating shaft 5 and the limiting movable chamber 401 .

[0039] When the present invention is in use, the coupling clamping sleeve 510 corresponding to the limiting activity chamber 401 is connected to the motor shaft of the pump body motor 1, and the coupling clamping sleeve 510 corresponding to the warehouse wall rotating shaft 5 is connected to the transmission shaft of the bearing box 3. Figure 1 As shown in .

[0040] When the pump motor 1 is started, the pump motor 1 drives the closed coupling chamber 4 and the axial push rod 403 to rotate. At this time, the locking friction protrusion 409 drives the friction ring 7 to rotate through friction force, thereby causing the transmission shaft of the bearing box 3 to rotate, realizing coupling transmission.

[0041] When the rotation speed of the friction ring platform 7 gradually increases, the centrifugal force on the centrifugal counterweight 805 gradually increases. When the centrifugal force is greater than the sum of the elastic force of the return push spring 807 and the magnetic attraction force of the magnetic plate 804, the locking plate 802 will be triggered to move outward quickly. After the locking plate 802 is triggered to move outward, it is squeezed on the inner surface of the locking friction protrusion 409. As a small amount of relative rotation occurs between the locking friction protrusion 409 and the friction ring platform 7, when the gap between the locking plate 802 and the locking friction protrusion 409 is aligned, it will cut into the gap of the locking friction protrusion 409, so that the locking plate 802 is between the locking groove 8 and the locking friction protrusion 409, switching to rigid transmission, with higher efficiency.

[0042] Another occasional situation is that when the transmission shaft of the bearing box 3 is subject to greater resistance and the locking friction protrusion 409 cannot drive the friction ring 7 to start rotating through friction, a long period of relative rotational friction will occur between the locking friction protrusion 409 and the friction ring 7. The friction heat generated by friction can cause the locking friction protrusion 409 and the friction ring 7 to heat up to hundreds of degrees Celsius. Since the closed coupling chamber 4 is a closed structure, the friction protrusion 409 at hundreds of degrees Celsius rotates inside it and can fully contact the gas inside the closed coupling chamber 4, thereby heating the gas. When the gas heats up, it will expand, and the volume of the closed coupling chamber 4 is inconvenient, so the air pressure will increase significantly.

[0043] When the air pressure increases, Figure 5 As shown in , air pressure acts on the lower surface of the airtight piston disc 504 at the upper part and the upper surface of the airtight piston disc 504 at the lower part, driving the airtight piston disc 504 to move. The air pressure thrust on the airtight piston disc 504 must be greater than the sum of the magnetic force between the magnetic suction plates 804, the reset push spring 807 and the elastic force of the calibration tension spring 509, so as to ensure that the airtight piston disc 504 can be driven to move.

[0044] This triggers the upper end of the top shaft 505 to press against the lower surface of the vertical matching plate 507, which can push the vertical matching plate 507 to move the centrifugal counterweight 805, and then clamp the locking plate 802 between the locking groove 8 and the locking friction protrusion 409, switching to rigid transmission, and hard starting the transmission shaft of the bearing box 3 to avoid excessive wear between the locking friction protrusion 409 and the friction ring platform 7, and avoid affecting the starting performance of the chemical centrifugal pump.

[0045] In the above hard starting condition, when the pump motor 1 still cannot rotate, the operating current of the pump motor 1 is monitored, so that the pump motor 1 is powered off in time for protection, thereby avoiding burning of the pump motor 1.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A chemical centrifugal pump with a closed coupling, comprising a pump motor (1), a centrifugal pump chamber (2), a bearing box (3), a closed coupling chamber (4), a chamber wall rotating shaft (5), a driven plate (6), a friction ring (7) and a locking chute (8), wherein the centrifugal pump chamber (2) and the bearing box (3) are fixedly arranged, and characterized in that: The pump body motor (1) is installed through the closed coupling bin (4) and the bearing box (3). The closed coupling bin (4) is a cylindrical cavity structure. A circular hole is provided on the side of the closed coupling bin (4) facing the bearing box (3). A bin wall rotating shaft (5) is provided in the circular hole for airtight rotation. A driven disc (6) is fixedly provided on one end of the bin wall rotating shaft (5) located inside the closed coupling bin (4). A friction ring platform (7) is fixedly provided on the surface of the driven disc (6) away from the bin wall rotating shaft (5). A locking slot (8) is symmetrically provided inside the friction ring platform (7). An extrusion drive mechanism with an elastic compensation function is provided inside and outside the closed coupling bin (4). The extrusion drive mechanism is in friction contact with the friction ring platform (7). A centrifugal locking mechanism is provided inside and outside the locking slot (8). The centrifugal locking mechanism has a quick triggering function. After the centrifugal locking mechanism is triggered, it can cooperate with the extrusion drive mechanism for locking. The extrusion drive mechanism comprises a limiting activity chamber (401), a limiting convex ring (402), an axially movable push column (403) and a blocking ring (404); the limiting activity chamber (401) is fixedly coaxial with the closed coupling chamber (4); a limiting convex ring (402) is fixedly arranged between the limiting activity chamber (401) and the closed coupling chamber (4); an axially movable push column (403) is inserted into the interior of the limiting convex ring (402); a blocking ring (404) is fixedly arranged on one end of the axially movable push column (403) located inside the limiting activity chamber (401); a convex ridge limiting groove (405) is provided on the inner wall surface of the limiting convex ring (402); and a axially movable push column (403) is fixedly arranged on the outer surface of the limiting convex ring (402). There is a push column rib (406), the push column rib (406) is slidably arranged inside the rib limiting groove (405), and a driving pressure plate (407) is fixedly arranged on one end of the axial push column (403) located inside the closed coupling chamber (4); a locking friction convex block (409) is fixedly arranged on the side of the driving pressure plate (407) away from the axial push column (403), and the locking friction convex blocks (409) are evenly distributed in a circular array, and the locking friction convex blocks (409) are in friction contact with the friction ring platform (7); a compensating extrusion spring (408) is installed on the outer sleeve of the axial push column (403), and the compensating extrusion spring (408) is sandwiched between the driving pressure plate (407) and the limiting convex ring (402); The centrifugal locking mechanism comprises a connecting groove plate (801), a locking plate (802), a fixed vertical plate (803) and a magnetic sheet (804), wherein the connecting groove plate (801) is slidably arranged inside the locking groove (8), a locking plate (802) is fixedly arranged at one end of the connecting groove plate (801), the locking plate (802) is located inside the center of the friction ring platform (7), a fixed vertical plate (803) is fixedly arranged on the surface of the locking plate (802) away from the connecting groove plate (801), and the fixed vertical plate (803) is fixedly arranged on the surface of the fixing plate (803). A magnetic sheet (804) is fixedly provided on the surface; a centrifugal counterweight (805) is fixedly provided on one end of the connecting slot plate (801) away from the locking plate (802); a track positioning frame (806) is fixedly provided on the outer surface of the friction ring platform (7); the centrifugal counterweight (805) is limitedly provided inside the track positioning frame (806); a reset push spring (807) is embedded and fixed on the surface of the centrifugal counterweight (805); the other end of the reset push spring (807) is in compression contact with the inner wall surface of the track positioning frame (806).

2. A chemical centrifugal pump with a closed coupling according to claim 1, characterized in that: A secondary trigger structure is provided inside and outside the warehouse wall rotating shaft (5) and the driven disk (6), and the position and number of the secondary trigger structure and the locking slot (8) correspond to each other.

3. A chemical centrifugal pump with a closed coupling according to claim 2, characterized in that: The secondary trigger structure comprises a pressure-sensitive notch (501), a pressure-driven cavity (502), an anti-slip convex ring (503) and an airtight piston disc (504). The pressure-sensitive notch (501) is provided inside the warehouse wall rotating shaft (5) and the driven disc (6). The pressure-sensitive notch (501) passes through the side facing the friction ring platform (7). The pressure-driven cavity (502) is symmetrically provided on the inner wall surface of the pressure-sensitive notch (501). The axis of the pressure-driven cavity (502) is parallel to the length direction of the locking groove (8). The anti-slip convex ring (503) is fixedly provided on the inner wall surface of the pressure-driven cavity (502) near the pressure-sensitive notch (501). The interior of the pressure-driven cavity (502) is airtightly provided with an airtight piston disc (504).

4. A chemical centrifugal pump with a closed coupling according to claim 3, characterized in that: A trigger top shaft (505) is fixedly provided on the surface of the airtight piston disc (504), a top shaft through cavity (506) is provided inside the driven disc (6), and the trigger top shaft (505) passes through the top shaft through cavity (506). A vertical matching plate (507) is fixedly provided on the surface of the centrifugal counterweight (805), and the vertical matching plate (507) corresponds to the trigger top shaft (505). A pressure-equalizing interactive air path (508) is provided inside the warehouse wall rotating shaft (5), one end of the pressure-equalizing interactive air path (508) is communicated with the pressure driving chamber (502), and the other end of the pressure-equalizing interactive air path (508) is communicated with the outside world. A calibration tension spring (509) is connected between the two groups of airtight piston discs (504), and the calibration tension spring (509) is in a stretched state.

5. The chemical centrifugal pump with a closed coupling according to claim 1, characterized in that: A thrust ball bearing (410) is embedded and installed on the inner wall surface of the closed coupling bin (4), and the thrust ball bearing (410) is in squeeze contact with the driven disc (6). The ends of the bin wall rotating shaft (5) and the limiting movable chamber (401) are respectively fixed with coupling clamping sleeves (510).

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