A thrust impeller structure

Abstract

The present application relates to the technical field related to electronic shielded pumps, and discloses a thrust impeller structure. In order to solve the problem that the cumulative tolerances in the processing, manufacturing and assembly of parts make the gap unstable, resulting in unstable hydraulic performance of the water pump, a thrust mechanism is provided at the end of the impeller. The thrust mechanism makes the impeller and the pump body relatively sealed, solves the axial leakage problem between the impeller and the pump body, improves the overall efficiency of the water pump, and avoids the error problem caused by the gap, and the product consistency is better.

Description

Technical Field

[0001] The present application relates to the technical field related to electronic shielded pumps, and in particular to a thrust impeller structure. Background Art

[0002] The electronic canned pump mainly discharges gas or liquid outward through the high-speed rotating rotor, thus forming a vacuum environment. Compared with traditional mechanical pumps, the electronic canned pump is characterized by low operating noise, no oil pollution, high vacuum degree, and fast pumping speed.

[0003] The current electronic shielded pump structure is as follows Fig. 9 As shown, it is composed of a pump body 1, an impeller 2, a push block bearing 3, a stop block bearing 4, a machine base 5, a driving shaft 6 and a rotor assembly 7. There is an axial gap between the pump body 1 and the impeller 2 because they are not in contact. When the rotor assembly 7 drives the driving shaft 6 to rotate, the impeller 2 rotates synchronously, thereby generating a centrifugal effect to enable the water pump to work normally; the stop block bearing 4 is in contact with the push block bearing 3, which plays an axial thrust role.

[0004] During actual use, due to the gap between the impeller and the pump body, there is a certain amount of leakage, which has a certain impact on the overall efficiency of the water pump; at the same time, due to the cumulative tolerances of component processing, manufacturing and assembly, the gap is unstable, resulting in unstable hydraulic performance of the water pump, small range fluctuation errors, and relatively poor product consistency. Summary of the invention

[0005] The present application proposes a thrust impeller structure, which has the advantage of axial thrust and is used to solve the error problem caused by the assembly gap proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: a thrust impeller structure, comprising: a machine base, a rotor assembly is fixed in the middle of the machine base, and the rotor assembly serves as a power source; a pump body, which is fixed to the machine base by bolts; a driving shaft, which is located in the middle of the rotor assembly, and the rotor assembly can drive the driving shaft to rotate, and the end of the driving shaft is located in the inner cavity of the pump body; an impeller, which is fixed to the end of the driving shaft and is located in the inner cavity of the pump body, and the medium is transported by rotating the impeller driven by the driving shaft; a push block bearing, which is fixed on the inner side of the machine base, and the push block bearing cooperates with the stop block bearing fixedly installed on the outer side of the driving shaft to achieve the purpose of axial thrust; a thrust mechanism, which is located between the end of the impeller and the inner side of the pump body, and not only plays the role of axial thrust but also achieves sealing and leakage prevention.

[0007] Furthermore, the thrust mechanism is composed of the following two structures: a thrust bearing embedded and fixed at the end of the impeller; and a thrust bearing embedded and fixed inside the pump body opposite to the thrust bearing, and the thrust bearing and the thrust bearing are in sliding contact.

[0008] Furthermore, the thrust mechanism is arranged at any ring opening position of the impeller.

[0009] Furthermore, thrust mechanisms are arranged at all the ring opening positions of the impeller.

[0010] Furthermore, a protruding cylindrical ring is provided at the end of the impeller; the thrust mechanism is composed of the following structures: a thrust shaft frame, which is movably sleeved with the protruding cylindrical ring at the end of the impeller, and the thrust shaft frame is movably installed on the inner side of the pump body, and the thrust shaft frame can only perform horizontal reciprocating movements on the inner side of the pump body; a return spring, which is installed between the inner side of the pump body and the end of the thrust shaft frame, so that the thrust shaft frame can always move in the direction of the impeller; a guide groove, which is opened at the end of the impeller, and a power ball is movably arranged in the guide groove, and the power ball is attached to the middle end face of the thrust shaft frame, and the fitting surface is an inclined surface; a pressure storage chamber, which is composed of the end of the impeller and the inner side of the thrust shaft frame.

[0011] Furthermore, the cylindrical ring at the end of the impeller is made of metal, and the sliding part between the thrust shaft bracket and the cylindrical ring is made of rubber.

[0012] Furthermore, an inner retaining ring plate located on the inner side of the impeller is fixed to the end of the thrust shaft frame via bolts, and an outer retaining ring plate located on the outer side of the impeller is fixed to the end of the thrust shaft frame via bolts.

[0013] Furthermore, the thrust mechanism also includes: a pressure relief channel, which is used for the output of airflow and medium and is opened at the outer bottom of the pump body; a pressure relief chamber, which is opened at the outer bottom of the thrust shaft frame and is used to realize the communication between the pressure storage chamber and the pressure relief channel; an adjusting plug, which is T-shaped and movably sleeved in the pressure relief chamber, and one end of the adjusting plug is fixedly installed with a reset magnetic block close to the impeller side; a limit spring, which is fixedly installed at the end of the adjusting plug and is located on the outer side of the reset magnetic block, and the limit spring is fixedly connected to the inner side of the thrust shaft frame; a locking block, which is used to realize one-way locking during the movement of the thrust shaft frame, is movably installed on the outer side of the thrust shaft frame, and after the reset magnetic block moves to above the end of the locking block, the locking block is retracted into the thrust shaft frame; a locking groove, which is opened on the inner side of the pump body and is used for inserting the locking block; a pressure relief channel, which is opened on the outer side of the thrust shaft frame and is used to communicate the pressure relief chamber and the pressure relief channel.

[0014] Furthermore, the cross-sectional shape of the locking block is a right-angled trapezoid.

[0015] Furthermore, an inching block located at the highest part of the inclined surface is arranged on the outer side of the middle part of the thrust shaft frame, the surface of the inching block is composed of two arc surfaces connected at the top, and the number of the inching blocks is at least twenty.

[0016] The present invention has the following beneficial effects:

[0017] The present application provides a thrust impeller structure, in which a thrust mechanism is arranged at the end of the impeller. The thrust mechanism makes the impeller and the pump body relatively sealed, solves the axial leakage problem between the impeller and the pump body, improves the overall efficiency of the water pump, and avoids the error problem caused by the gap. The product consistency is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute a part of the specification, illustrate embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0019] The present application can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0020] Figure 1 It is a cross-sectional view of a first embodiment of the thrust mechanism of the present invention;

[0021] Figure 2 This is a second position diagram of the first embodiment of the thrust mechanism of the present invention;

[0022] Figure 3 This is a third position diagram of the first embodiment of the thrust mechanism of the present invention;

[0023] Figure 4 It is a cross-sectional view of a second embodiment of the thrust mechanism of the present invention;

[0024] Figure 5 for Figure 4 The structure diagram at A is enlarged;

[0025] Figure 6 A three-dimensional diagram of the overall appearance of the thrust shaft frame;

[0026] Figure 7 The overall internal stereogram of the thrust shaft frame;

[0027] Figure 8 It is a schematic diagram of the distribution of power balls at the end of the impeller;

[0028] Fig. 9 It is a schematic diagram of the prior art.

[0029] In the figure: 1. pump body; 2. impeller; 200. guide groove; 3. thrust block bearing; 4. stop block bearing; 5. machine base; 6. driving shaft; 7. rotor assembly; 8. thrust mechanism; 9. thrust bearing; 10. thrust bearing; 11. power ball; 12. outer retaining ring plate; 13. inner retaining ring plate; 14. thrust shaft frame; 15. pressure storage chamber; 16. inching block; 17. limit spring; 18. reset spring; 19. regulating plug; 20. pressure relief chamber; 21. pressure relief channel; 22. pressure relief channel; 23. reset magnetic block; 24. locking block; 25. locking groove. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] Embodiment 1

[0032] See also Figure 1-Figure 3 The pump body 1 and the base 5 are fixedly connected by bolts, and the rotor assembly 7 arranged in the base 5 serves as a driving source, so that the rotor assembly 7 can drive the driving shaft 6 to rotate. The driving shaft 6 is fixedly mounted with an impeller 2 located in the inner cavity of the pump body 1. The impeller 2 rotates according to the rotation of the driving shaft 6, thereby realizing the transportation of the medium. A push block bearing 3 is fixedly mounted on the inner side of the base 5, and a stop block bearing 4 that cooperates with the push block bearing 3 is fixedly mounted on the outer side of the driving shaft 6. The movement of the driving shaft 6 is limited by the push block bearing 3 and the stop block bearing 4, thereby increasing the stability of the rotation of the driving shaft 6. A thrust mechanism 8 is arranged between the end of the impeller 2 and the inner side of the pump body 1, which not only plays an axial thrust role, but also plays a sealing and leak-proof role.

[0033] refer to Figure 1 As the first arrangement of the thrust mechanism 8 in the present application, a thrust bearing 9 is embedded and fixed at the end of the impeller 2, and a thrust bearing 10 opposite to the thrust bearing 9 is embedded and fixed on the inner side of the pump body 1. The thrust bearing 9 and the thrust bearing 10 are in direct contact with each other, so that a sealing effect is formed by fitting the two together, which solves the axial leakage problem between the impeller 2 and the pump body 1, improves the overall efficiency of the water pump, and avoids the error problem caused by the gap between the two, and the product consistency is relatively good.

[0034] refer to Figure 2 As the second arrangement of the thrust mechanism 8 in the present application, the thrust mechanism 8 is arranged at any other ring position of the impeller 2. The principle is the same as the first arrangement. Since the thrust bearing 9 and the thrust bearing 10 are in direct contact, the two slide relative to each other and there is no gap, which solves the inlet leakage problem of the water pump.

[0035] refer to Figure 3 As the third arrangement mode of the thrust stop mechanism 8 in the present application, the thrust stop mechanism 8 is arranged at all the ring openings of the impeller 2. The number of thrust stop mechanisms 8 given in the present application is two. In actual use, the specific number can be determined by the actual protruding ring openings of the impeller 2. The principle of use is the same as that mentioned above.

[0036] Embodiment 2

[0037] Based on Example 1, please refer to Figure 4-Figure 8 In the scheme implemented in the first embodiment, although the sealing problem is solved, since the thrust bearing 9 and the thrust bearing 10 need to rub for a long time during use, the wear caused by the friction will still produce a gap, so the stability of the seal is relatively low. At the same time, when the seal between the thrust bearing 9 and the thrust bearing 10 is not tight, external personnel cannot quickly know it, and cannot quickly repair it. In order to solve such problems, another thrust mechanism 8 designed in the second embodiment is provided with a protruding cylindrical ring at the end of the impeller 2, such as Figure 5 As shown, the end of the impeller 2 is movably sleeved with a thrust shaft frame 14, and a seal is formed between the side of the cylindrical ring on the impeller 2 and the thrust shaft frame 14. At the same time, the impeller 2 and the thrust shaft frame 14 can rotate relative to each other. The thrust shaft frame 14 is movably sleeved on the inner side of the pump body 1. The thrust shaft frame 14 can only perform horizontal reciprocating movements on the inner side of the pump body 1. The thrust shaft frame 14 and the pump body 1 cannot rotate relative to each other, and a return spring 18 is provided between the inner side of the pump body 1 and the end of the thrust shaft frame 14. The return spring 18 is provided between the inner side of the pump body 1 and the end of the thrust shaft frame 14. The elastic force of 8 will push the thrust shaft frame 14 to always move in the direction of the impeller 2. A guide groove 200 is opened at the end of the impeller 2, and a power ball 11 is movably arranged in the guide groove 200. The power ball 11 can only move along the guide groove 200. During the rotation of the impeller 2, the power ball 11 is thrown outward along the guide groove 200 by the centrifugal force. The power ball 11 is attached to the middle end face of the thrust shaft frame 14, and the attached surface is an inclined surface. The angle between the inclined surface and the central axis of the thrust shaft frame 14 is 70 to 80 degrees. Therefore, in actual use, the impeller 2 rotates, and the power ball 11 on the impeller 2 is thrown outward due to the centrifugal force generated by the rotation, so that the power ball 11 pushes the thrust shaft frame 14 to compress the return spring 18, and the thrust shaft frame 14 moves away from the impeller 2. Since the outer side of the end of the impeller 2 is relatively sealed with the inner side of the thrust shaft frame 14, when the thrust shaft frame 14 moves away from the impeller 2, the end of the impeller 2 and the inner side of the thrust shaft frame 14 form a pressure storage chamber 15, and the airflow pressure in the pressure storage chamber 15 drops sharply, thereby limiting The thrust shaft bracket 14 is separated from the impeller 2, and when a gap appears between the end of the impeller 2 and the inner side of the thrust shaft bracket 14 due to wear, the pressure storage chamber 15 is connected with the inner cavity of the impeller 2 through the gap, forcing the thrust shaft bracket 14 to compress the reset spring 18 again under the thrust of the power ball 11 until there is no gap between the impeller 2 and the thrust shaft bracket 14. It can be clearly seen that through the implementation of the second embodiment, after a wear gap appears between the impeller 2 and the thrust shaft bracket 14, the sealing position can be switched autonomously to ensure the stability of the seal.

[0038] The cylindrical ring at the end of the impeller 2 is made of metal, and the sliding part between the thrust shaft frame 14 and the cylindrical ring is made of rubber. Therefore, when wear occurs between the impeller 2 and the thrust shaft frame 14 due to rotation, the thrust shaft frame 14 will be consumed first, ensuring that after the thrust shaft frame 14 moves along the axial direction of the impeller 2, the impeller 2 can again fit with the thrust shaft frame 14 at other parts to form a seal.

[0039] Combination Figure 8 At least five power balls 11 are arranged at the end of the impeller 2, and the five power balls 11 are arranged in a ring shape with equal angles along the impeller 2. Therefore, in actual use, by setting multiple power balls 11 to move outward at the same time, sufficient force is provided to push the thrust shaft frame 14 to move.

[0040] Combination Figure 5 and Figure 6 The end of the thrust shaft frame 14 is fixed with an inner retaining ring plate 13 located on the inner side of the impeller 2 by bolts, and the end of the thrust shaft frame 14 is fixed with an outer retaining ring plate 12 located on the outer side of the impeller 2 by bolts, and the inner retaining ring plate 13 and the outer retaining ring plate 12 are both annular, and the axial movement of the thrust shaft frame 14 is limited by the inner retaining ring plate 13 and the outer retaining ring plate 12 to prevent the impeller 2 from separating from the thrust shaft frame 14.

[0041] Combination Figure 5 and Figure 7A pressure relief channel 22 is provided at the outer bottom of the pump body 1, and a pressure relief chamber 20 for communicating the pressure storage chamber 15 and the pressure relief channel 22 is provided at the outer bottom of the thrust shaft frame 14. An adjusting plug 19 is movably sleeved in the pressure relief chamber 20, and the cross-sectional shape of the adjusting plug 19 is T-shaped. A reset magnetic block 23 close to the impeller 2 is fixedly installed at the end of the adjusting plug 19, and a limit spring 17 located on the outer side of the reset magnetic block 23 is fixedly installed at the end of the adjusting plug 19, and the limit spring 17 is fixedly connected to the inner side of the thrust shaft frame 14. A locking block 24 is movably installed on the outer side of the thrust shaft frame 14. After the reset magnetic block 23 moves to the upper end of the locking block 24, the locking block 24 is sucked into the inner side of the thrust shaft frame 14 by the magnetic force of the reset magnetic block 23. A locking groove 25 adapted to the locking block 24 is provided on the inner side of the pump body 1. When the reset magnetic block 23 is away from the locking block 24, The locking block 24 will be inserted into the locking groove 25 due to its own gravity, thereby limiting the movement of the thrust shaft frame 14. The cross-sectional shape of the locking block 24 is a right-angled trapezoid, and the inclined surface of the locking block 24 is downward. The shape of the locking groove 25 is a triangular groove corresponding to the locking block 24. When the locking block 24 is inserted into the locking groove 25, the thrust shaft frame 14 can still move in the direction of the impeller 2, but when the thrust shaft frame 14 moves away from the impeller 2, it will be restricted by the locking block 24 and cannot move. The outer side of the thrust shaft frame 14 is provided with a pressure relief channel 21 located on one side of the locking block 24, and the pressure relief channel 21 is communicated with the pressure relief channel 22. Therefore, when the regulating plug 19 passes over the pressure relief channel 21, the pressure storage chamber 15 is communicated with the pressure relief channel 21 through the pressure relief chamber 20, thereby ensuring that when the impeller 2 is installed in the thrust shaft frame 14, the excess airflow in the pressure storage chamber 15 will be output from the pressure relief channel 21 and the pressure relief channel 22.

[0042] A jog block 16 located at the highest part of the inclined surface is arranged on the outer side of the middle part of the thrust shaft frame 14. The surface of the jog block 16 is composed of two arc surfaces connected at the top, and the maximum height of the arc surface is aligned with the highest part of the inclined surface on the outer side of the thrust shaft frame 14. There are at least twenty jog blocks 16, and the jog blocks 16 are arranged in a circular shape with equal angles on the thrust shaft frame 14. When the power ball 11 moves in the jog block 16, the thrust shaft frame 14 will continuously move back and forth due to the undulating arc surface of the jog block 16.

[0043] When using:

[0044] Under normal conditions, the elastic force of the limit spring 17 will push the reset magnet 23 to the top of the lock block 24, thereby sucking the lock block 24 into the thrust shaft frame 14, and the lock block 24 will be away from the lock groove 25, and the outer side of the regulating plug 19 will block the pressure relief channel 21.

[0045] When the impeller 2 is installed in the thrust shaft frame 14, since the outer side of the impeller 2 and the thrust shaft frame 14 must be relatively sealed during installation, the air flow pressure in the pressure storage chamber 15 increases, and the air flow will be squeezed into the pressure relief chamber 20, forcing the regulating plug 19 to move in the direction away from the impeller 2 until the pressure relief channel 21 and the pressure relief chamber 20 are connected. At this time, the air flow in the pressure storage chamber 15 will be discharged outward through the pressure relief chamber 20, the pressure relief channel 21 and the pressure relief channel 22, and the impeller 2 can be installed normally. When the impeller 2 is installed, the air flow pressure in the pressure storage chamber 15 no longer increases, and the limit spring 17 will pull the regulating plug 19 to block the pressure relief channel 21. Finally, the inner baffle plate 13 and the outer baffle plate 12 are installed to the appropriate positions accordingly.

[0046] When the impeller 2 rotates, the centrifugal force generated by the power ball 11 will move the thrust shaft frame 14 in the direction of the return spring 18 and squeeze the return spring 18 at the same time. At the same time, when the impeller 2 and the thrust shaft frame 14 are sealed, the thrust shaft frame 14 moving away will cause the pressure in the pressure storage chamber 15 to decrease, forcing the adjusting plug 19 to compress the limit spring 17. At the same time, the reset magnet 23 will move away from the locking block 24, and the locking block 24 will be inserted into the locking groove 25 due to its own gravity, thereby limiting the movement of the thrust shaft frame 14. When a gap appears between the impeller 2 and the thrust shaft frame 14 due to long-term wear, the gap will relieve the pressure in the pressure storage chamber 15. Under the action of the elastic force of the limit spring 17, the reset magnet 23 will move above the locking block 24 again, and the locking block 24 will move upward and disengage from the locking groove 25. After that, under the action of the centrifugal force of the power ball 11 When the impeller 2 is at different speeds, the centrifugal force exerted on the power ball 11 will also change. If there is no limiting function of the locking block 24, the sealing position between the impeller 2 and the thrust shaft frame 14 will be different due to the different speeds, resulting in unstable wear of the thrust shaft frame 14. After the locking block 24 is inserted into the locking groove 25, the contact position between the impeller 2 and the thrust shaft frame 14 will continue to approach the inner retaining ring plate 13 as it wears, thereby limiting the order of the wear position on the inner side of the thrust shaft frame 14 and extending the sealing life of the thrust shaft frame 14.

[0047] When the impeller 2 contacts the inner baffle plate 13 and the outer baffle plate 12, it means that the thrust shaft frame 14 has completely lost its sealing effect, and the medium in the inner cavity of the pump body 1 will flow into the pressure storage chamber 15 along the gap between the thrust shaft frame 14 and the impeller 2. At this time, the pressure in the pressure storage chamber 15 is not enough to overcome the elastic force of the limit spring 17, and the regulating plug 19 will be limited by the elastic force of the limit spring 17 so that the reset magnetic block 23 will retract the lock block 24, and the power ball 11 will move to the position of the inching block 16 under the action of centrifugal force. When the power ball 11 moves to the highest position of the inching block 16, the power ball 11 pushes the thrust shaft frame 14 the farthest distance, and the space in the pressure storage chamber 15 is the largest, which can be injected with excess Medium, then, when the power ball 11 moves to the bottom between the two inching blocks 16, the thrust shaft frame 14 will be squeezed toward the impeller 2 by the elastic force of the return spring 18, and the medium squeezed in the pressure storage chamber 15 will force the regulating plug 19 to move away from the limit spring 17 until the pressure relief channel 21 and the pressure relief chamber 20 are connected again, and the medium flows along the pressure relief channel 21 to the pressure relief channel 22. Due to the continuous rotation of the impeller 2, the thrust shaft frame 14 will continuously move back and forth left and right, and the medium will also periodically eject from the pressure relief channel 22. After external personnel check the periodic jet in the pressure relief channel 22, they can quickly know that the thrust shaft frame 14 can no longer seal normally and needs to be replaced.

Claims

1. A thrust impeller structure, characterized in that: include: A machine base (5), a rotor assembly (7) being fixed in the middle of the machine base (5), the rotor assembly (7) serving as a power source; The pump body (1) is fixed to the base (5) by bolts; A driving shaft (6) is located in the middle of the rotor assembly (7), and the rotor assembly (7) is capable of driving the driving shaft (6) to rotate, and an end of the driving shaft (6) is located in the inner cavity of the pump body (1); An impeller (2) is fixed to the end of the driving shaft (6) and is located in the inner cavity of the pump body (1), and the driving shaft (6) drives the impeller (2) to rotate to realize the conveyance of the medium; A push block bearing (3) is fixed on the inner side of the machine base (5), and the push block bearing (3) cooperates with a stop block bearing (4) fixedly mounted on the outer side of the driving shaft (6) to achieve the purpose of axial thrust stopping; The thrust mechanism (8) is located between the end of the impeller (2) and the inner side of the pump body (1), and plays the role of axial thrust stop and also achieves sealing and leakage prevention; The end of the impeller (2) is provided with a protruding cylindrical ring; The thrust mechanism (8) consists of the following structure: A thrust shaft frame (14) is movably sleeved with a cylindrical ring protruding from the end of the impeller (2), and the thrust shaft frame (14) is movably mounted on the inner side of the pump body (1), and the thrust shaft frame (14) can only perform horizontal reciprocating movement on the inner side of the pump body (1); A return spring (18) is installed between the inner side of the pump body (1) and the end of the thrust shaft frame (14) to ensure that the thrust shaft frame (14) always moves in the direction of the impeller (2); The guide groove (200) is provided at the end of the impeller (2), and a power ball (11) is movably arranged in the guide groove (200), wherein the power ball (11) is attached to the middle end surface of the thrust shaft frame (14), and the attached surface is an inclined surface; the thrust shaft frame (14) is inclined in a radial direction from the inside to the outside, and the inclined surface is inclined toward the impeller (2); A pressure storage chamber (15) is formed by the end of the impeller (2) and the inner side of the thrust shaft bracket (14); The cylindrical ring at the end of the impeller (2) is made of metal, and the sliding part between the thrust shaft frame (14) and the cylindrical ring is made of rubber.

2. The thrust impeller structure according to claim 1, characterized in that: An inner retaining ring plate (13) located inside the impeller (2) is fixed to the end of the thrust shaft frame (14) via bolts, and an outer retaining ring plate (12) located outside the impeller (2) is fixed to the end of the thrust shaft frame (14) via bolts.

3. The thrust impeller structure according to claim 1, characterized in that: The thrust mechanism (8) further comprises: A pressure relief channel (22) is used for outputting airflow and medium and is provided at the outer bottom of the pump body (1); A pressure relief chamber (20) is provided at the outer bottom of the thrust shaft frame (14) and is used to communicate the pressure storage chamber (15) with the pressure relief channel (22); The regulating plug (19) is T-shaped and is movably sleeved in the pressure relief chamber (20). A reset magnetic block (23) close to one side of the impeller (2) is fixedly mounted on one end of the regulating plug (19); A limit spring (17) is fixedly mounted on the end of the regulating plug (19) and is located outside the reset magnetic block (23), and the limit spring (17) is fixedly connected to the inner side of the thrust shaft frame (14); A locking block (24) is used to achieve one-way locking when the thrust shaft frame (14) moves. The locking block (24) is movably mounted on the outer side of the thrust shaft frame (14), and after the reset magnetic block (23) moves to above the end of the locking block (24), the locking block (24) is retracted into the thrust shaft frame (14); A locking groove (25) is provided on the inner side of the pump body (1) and is used for inserting a locking block (24); when the locking block (24) is inserted into the locking groove (25), the thrust shaft frame (14) is restricted from moving in a direction away from the impeller (2); The pressure relief passage (21) is provided on the outer side of the thrust shaft frame (14) and is used to connect the pressure relief chamber (20) and the pressure relief passage (22).

4. The thrust impeller structure according to claim 3, characterized in that: The cross-sectional shape of the locking block (24) is a right-angled trapezoid.

5. The thrust impeller structure according to claim 3, characterized in that: A jog block (16) is arranged on the outer side of the middle part of the thrust shaft frame (14) and is located at the highest part of the inclined surface. The surface of the jog block (16) is composed of two arc surfaces connected at the top, and the number of the jog blocks (16) is at least twenty.

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