Magnetic drive pump sliding bearing structure and magnetic drive pump

Abstract

The invention relates to the technical field of magnetic drive pump equipment, in particular to a magnetic drive pump sliding bearing structure and a magnetic drive pump. The magnetic drive pump sliding bearing structure comprises a bearing bush, two bearing seats and a pump cover, the two bearing seats are symmetrically arranged, a middle ring is arranged between the two bearing seats, the bearing bush is installed in the bearing seats, and a liquid storage cavity is formed in the pump cover; the liquid storage cavity is located on one side of the middle ring, the pump cover extends from the liquid storage cavity to the middle ring to be provided with a liquid supplementing flow channel, a liquid supplementing hole is formed in the side wall of the middle ring in a penetrating mode, two liquid supplementing valves are symmetrically arranged at the position of the liquid supplementing hole, the liquid supplementing hole is communicated with the liquid supplementing flow channel, a liquid inlet flow channel is formed in the pump cover, and a liquid inlet valve is arranged on the liquid inlet flow channel. The magnetic drive pump comprises the magnetic drive pump sliding bearing structure, it can be guaranteed that the sliding bearing is fully cooled and lubricated without introducing external equipment, abrasion of the sliding bearing is reduced, and the service life of the magnetic drive pump is greatly prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic pump equipment, and in particular to a magnetic pump sliding bearing structure and a magnetic pump. Background Art

[0002] A magnetic pump is a centrifugal pump that uses the principle of magnetic coupling to achieve leak-free liquid transportation. It is widely used in industrial situations where liquid leakage needs to be avoided. The structure of a magnetic pump is complex, including a pump cover, impeller, internal magnetic steel, external magnetic steel, isolation sleeve, pump shaft, sliding bearing, coupling, motor and base. Among them, the sliding bearing is one of the important components of the magnetic pump, which is used to support the pump shaft and allow the pump shaft to rotate.

[0003] During use, the magnetic pump mainly relies on medium transportation to cool and lubricate the sliding bearing. When the medium in the magnetic pump runs at a flow rate lower than the standard value, the lubricating medium cannot enter the friction pair of the sliding bearing bush due to insufficient pressure. The bush of the sliding bearing suffers from great wear and tear due to lack of lubricating medium, which seriously affects the service life of the magnetic pump.

[0004] In order to avoid damage to sliding bearings due to lack of lubricating medium, some magnetic pumps in the prior art try to adopt an external medium flushing lubrication method. However, the external medium lubrication system requires the introduction of additional equipment and pipelines such as gear oil pumps to provide lubricating fluid, which increases the complexity of the entire system, resulting in higher maintenance costs and more potential failure points. At the same time, since the external lubricating fluid needs to be provided by other equipment, energy consumption is greatly increased. Summary of the invention

[0005] The object of the present invention is to provide a magnetic pump sliding bearing structure and a magnetic pump to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A magnetic pump sliding bearing structure is sleeved on the pump shaft, including a bearing shell, a bearing seat and a pump cover, wherein two bearing seats are symmetrically arranged, the bearing seats are fixed to the pump cover by bolts, an intermediate ring is arranged between the two bearing seats, the bearing shell is installed in the bearing seat, a liquid storage cavity is opened in the pump cover, the liquid storage cavity is located on one side of the intermediate ring, a liquid replenishment channel is extended from the liquid storage cavity to the intermediate ring in the pump cover, a liquid replenishment hole is penetrated through the side wall of the intermediate ring, two liquid replenishment valves are symmetrically arranged at the liquid replenishment hole, the liquid replenishment hole is connected with the liquid replenishment channel, a lubricating oil channel is opened in the pump cover, a liquid inlet channel is extended from one side of the lubricating oil channel close to the inlet end of the pump cover to the lower part of the liquid storage cavity in the pump cover, and a liquid inlet valve is arranged on the liquid inlet channel.

[0007] Furthermore, the liquid inlet valve includes a valve housing, the input side of the valve housing is connected to the liquid inlet channel, the output side of the valve housing is connected to the liquid storage chamber, a clamping plate is arranged inside the valve housing, and a flow hole is opened in the middle of the clamping plate.

[0008] Furthermore, the liquid inlet valve also includes a liquid inlet valve stem and a first spring. The liquid inlet valve stem is arranged in the valve housing, the liquid inlet valve stem passes through a clamping plate, and one end of the liquid inlet valve stem located on the input side of the valve housing is fixedly connected to a liquid inlet valve ball. The first spring is sleeved on the liquid inlet valve stem, one end of the first spring is connected to the clamping plate, and the other end of the first spring is connected to one end of the liquid inlet valve stem located on the output side of the valve housing.

[0009] Furthermore, a seal is provided between the intermediate ring and the pump cover, a sealing ring is provided between the contact surface of the intermediate ring and the bearing seat, an annular boss is provided in the middle of the inner surface of the intermediate ring, a limiting groove is provided on the upper part of the annular boss, the cross-section of the limiting groove is H-shaped, a flow hole is provided on the upper part of the intermediate ring, the axis of the limiting groove and the axis of the flow hole are parallel to the axis of the intermediate ring, the middle part of the flow hole is connected with the fluid replenishing hole, valve stem grooves are symmetrically provided above both sides of the limiting groove, the upper end of the valve stem groove is connected with the flow hole, and the lower end of the valve stem groove is connected with the limiting groove.

[0010] Furthermore, the refill valve includes a refill valve stem and a sealing ring. The refill valve stem is an inverted L-shape. The upper end of the refill valve stem enters the flow hole and bends toward the middle of the intermediate ring. The end of the bent section of the refill valve stem is fixedly connected with a refill valve ball. The lower end of the refill valve stem passes through the valve stem groove and is fixedly connected to the middle of the sealing ring. The sealing ring is arranged in the limit groove, and the outer surface of the sealing ring abuts against the circumferential surface of the end of the limit groove. A baffle is arranged in the middle of the sealing ring.

[0011] Furthermore, the liquid replenishing valve also includes a second spring and a limiting rod, the limiting rod is arranged in the limiting groove, one end of the limiting rod away from the middle of the intermediate ring extends into the sealing ring and is fixedly connected to the baffle, the second spring is sleeved on the limiting rod, one end of the second spring is connected to the baffle, and the other end of the second spring is connected to the step surface of the limiting groove.

[0012] Furthermore, a flow channel is opened on the upper part of the bearing seat, the axis of the flow channel is aligned with the axis of the flow hole, the flow channel is connected to the flow hole, and an injection hole is opened radially in the middle part of the bearing shell, the axis of the injection hole is perpendicular to the axis of the flow hole, and the flow channel is connected to the injection hole.

[0013] The present invention also provides a magnetic pump, comprising a pump body, an impeller, an inner magnetic steel, an outer magnetic steel, an isolation sleeve, a motor, a base, a pump shaft and any one of the magnetic pump sliding bearing structures described in the above. The pump body is installed on the base, the pump body is fixedly connected to the pump cover, the impeller is arranged in the pump body, the impeller is connected to one end of the pump shaft, a return flow channel is opened at the axis center of the pump shaft, the return flow channel is connected to the cavity where the impeller is located, a diversion hole is opened radially through the middle part of the pump shaft, the inner magnetic steel is connected to the other end of the pump shaft, the isolation sleeve is arranged outside the inner magnetic steel, the isolation sleeve is fixedly connected to the pump cover, the outer magnetic steel is connected to the output end of the motor, the outer magnetic steel sleeve is arranged outside the isolation sleeve, and the motor is installed on the base.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. A magnetic pump sliding bearing structure and a magnetic pump provided by the present invention are provided with a liquid storage chamber above the sliding bearing. When the medium flow is sufficient, the lubricating medium is stored in the liquid storage chamber. When the medium flow is insufficient, the lubricating medium in the liquid storage chamber can flow into the friction pair of the sliding bearing through the liquid replenishing channel, thereby ensuring that the sliding bearing can be fully cooled, reducing the wear of the sliding bearing, and greatly extending the service life of the magnetic pump.

[0015] 2. The present invention provides a magnetic pump sliding bearing structure and a magnetic pump, in which the liquid storage chamber and the liquid replenishment channel are both the main structure of the magnetic pump, and there is no need to introduce external equipment or external medium for lubrication, which can reduce additional energy consumption and will not lead to an increase in maintenance costs and energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view of a magnetic pump according to an embodiment of the present invention; Figure 2 For the present invention Figure 1 A magnified view of the sliding bearing structure of the medium magnetic pump; Figure 3 It is an enlarged cross-sectional view of the liquid inlet valve according to an embodiment of the present invention; Figure 4 An enlarged cross-sectional view of a liquid replenishing valve according to an embodiment of the present invention; Figure 5 Schematic diagram of a liquid replenishing valve according to an embodiment of the present invention.

[0017] In the figure: 1. bearing shell; 11. injection hole; 2. bearing seat; 21. intermediate ring; 211. limit groove; 212. valve stem groove; 213. flow hole; 214. liquid replenishment hole; 22. flow channel; 3. pump cover; 31. lubricating oil flow channel; 32. liquid inlet flow channel; 33. liquid replenishment flow channel; 4. pump shaft; 5. liquid storage chamber; 6. liquid inlet valve; 61. valve housing; 611. clamping plate; 62. liquid inlet valve stem; 621. liquid inlet valve ball; 63. first spring; 7. liquid replenishment valve; 71. liquid replenishment valve stem; 711. liquid replenishment valve ball; 72. sealing ring; 721. baffle; 73. second spring; 74. limit rod. DETAILED DESCRIPTION

[0018] 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 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 creative work are within the scope of protection of the present invention.

[0019] In the following description of the invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. The term "connection" only indicates the connection between devices and has no special meaning.

[0020] In addition, the technical fields and installation methods involved in the embodiments of the present invention described below can be combined with each other as long as there is no conflict between them.

[0021] For specific embodiments, please refer to Figure 1-Figure 5 A magnetic pump sliding bearing structure is sleeved on a pump shaft 4, including a bearing bush 1, a bearing seat 2 and a pump cover 3, wherein two bearing seats 2 are symmetrically arranged, and the bearing seats 2 are fixed to the pump cover 3 by bolts, and an intermediate ring 21 is arranged between the two bearing seats 2, and the bearing bush 1 is installed in the bearing seat 2, and a liquid storage chamber 5 is provided in the pump cover 3, and the liquid storage chamber 5 is located on one side of the intermediate ring 21, and a liquid replenishment channel 33 is extended from the liquid storage chamber 5 to the intermediate ring 21 of the pump cover 3, and a liquid replenishment hole 214 is penetrated through the side wall of the intermediate ring 21, and two liquid replenishment valves 7 are symmetrically arranged at the liquid replenishment hole 214, and the liquid replenishment hole 214 is connected with the liquid replenishment channel 33, and a lubricating oil channel 31 is provided in the pump cover 3, and a liquid inlet channel 32 is extended from the side of the lubricating oil channel 31 close to the inlet end of the pump cover 3 to the lower part of the liquid storage chamber 5 in the pump cover 3, and a liquid inlet valve 6 is arranged on the liquid inlet channel 32.

[0022] Furthermore, the liquid inlet valve 6 includes a valve housing 61, a liquid inlet valve stem 62 and a first spring 63. The input side of the valve housing 61 is communicated with the liquid inlet channel 32, and the output side of the valve housing 61 is communicated with the liquid storage chamber 5. A clamping plate 611 is provided inside the valve housing 61, and a flow hole is provided in the middle of the clamping plate 611. The liquid inlet valve stem 62 is provided in the valve housing 61, and the liquid inlet valve stem 62 passes through the clamping plate 611. One end of the liquid inlet valve stem 62 located on the input side of the valve housing 61 is fixedly connected with a liquid inlet valve ball 621. The first spring 63 is sleeved on the liquid inlet valve stem 62, one end of the first spring 63 is connected to the clamping plate 611, and the other end of the first spring 63 is connected to one end of the liquid inlet valve stem 62 located on the output side of the valve housing 61. When the lubricating medium in the liquid inlet channel 32 is sufficient and the lubricating medium in the liquid storage chamber 5 is sufficient, the liquid inlet valve stem 62 is connected to the output side of the valve housing 61. When the pressure is insufficient due to insufficient medium, the pressure of the lubricating medium in the liquid inlet channel 32 is relatively large, and the lubricating medium pushes the liquid inlet valve stem 62 to overcome the elastic force of the first spring 63 and the lateral pressure on the output side of the valve housing 61, and moves toward the direction close to the output side of the valve housing 61, so that the first spring 63 is stretched, and the liquid inlet channel 32 is connected with the liquid storage chamber 5, and the liquid storage chamber 5 stores liquid. When the pressure in the liquid storage chamber 5 increases to be equal to or greater than the lubricating medium pressure in the liquid inlet channel 32, the first spring 63 is reset under the action of the elastic force, so that the liquid inlet valve stem 62 moves toward the direction close to the input side of the valve housing 61 until the liquid inlet valve ball 621 abuts against the outlet end face of the liquid inlet channel 32, and the liquid inlet valve ball 621 prevents the lubricating medium from flowing from the liquid inlet channel 32 into the liquid storage chamber 5, and the liquid inlet channel 32 is not connected with the liquid storage chamber 5.

[0023] Furthermore, a seal is provided between the intermediate ring 21 and the pump cover 3, and a seal ring is provided between the contact surface of the intermediate ring 21 and the bearing seat 2 to prevent leakage between the liquid replenishment channel 33 and the flow channel 22. An annular boss is provided in the middle of the inner surface of the intermediate ring 21, and a limiting groove 211 is provided on the upper part of the annular boss. The cross section of the limiting groove 211 is H-shaped, and a flow hole 213 is provided on the upper part of the intermediate ring 21. The axis of the limiting groove 211 and the axis of the flow hole 213 are parallel to the axis of the intermediate ring 21. The middle of the flow hole 213 It is connected to the fluid replenishing hole 214, and a flow channel 22 is opened on the upper part of the bearing seat 2. The axis of the flow channel 22 is aligned with the axis of the flow hole 213, and the flow channel 22 is connected to the flow hole 213. A liquid injection hole 11 is radially opened in the middle part of the bearing shell 1, and the axis of the liquid injection hole 11 is perpendicular to the axis of the flow hole 213, and the flow channel 22 is connected to the liquid injection hole 11. Valve stem grooves 212 are symmetrically opened on both sides of the upper part of the limit groove 211, and the upper end of the valve stem groove 212 is connected to the flow hole 213, and the lower end of the valve stem groove 212 is connected to the limit groove 211.

[0024] Furthermore, the refill valve 7 includes a refill valve stem 71, a sealing ring 72, a second spring 73 and a limiting rod 74. The refill valve stem 71 is in an inverted L shape. The upper end of the refill valve stem 71 enters the flow hole 213 and bends to the middle of the intermediate ring 21. The end of the bent section of the refill valve stem 71 is fixedly connected with a refill valve ball 711. The lower end of the refill valve stem 71 passes through the valve stem groove 212 and is fixedly connected to the middle of the sealing ring 72. The sealing ring 72 is arranged in the limiting groove 211. The outer surface of the sealing ring 72 abuts against the circumferential surface of the end of the limiting groove 211. The sealing ring 7 2 To ensure that the medium does not overflow from the valve stem groove 212 into the limiting groove 211, a baffle 721 is provided in the middle of the sealing ring 72, and the limiting rod 74 is provided in the limiting groove 211. One end of the limiting rod 74 away from the middle of the intermediate ring 21 extends into the sealing ring 72 and is fixedly connected to the baffle 721. The second spring 73 is sleeved on the limiting rod 74, one end of the second spring 73 is connected to the baffle 721, and the other end of the second spring 73 is connected to the step surface of the limiting groove 211. When the liquid storage chamber 5 is in the liquid storage state, when the lubricating medium in the gap between the intermediate ring 21 and the pump shaft 4 When the lubricating medium is sufficient, the lubricating medium can push the baffle 721 under the action of pressure to make the liquid replenishing valve ball 711 of the liquid replenishing valve stem 71 abut against the end surface of the connection between the flow hole 213 and the liquid replenishing channel 33, and the liquid replenishing valve ball 711 prevents the lubricating medium in the liquid storage chamber 5 from flowing into the flow hole 213 from the liquid replenishing channel 33, and the liquid replenishing channel 33 is not connected with the flow hole 213; when there is not enough lubricating medium in the gap between the intermediate ring 21 and the pump shaft 4, the lubricating medium pressure on the baffle 721 is reduced, the liquid storage chamber 5 is in a liquid replenishing state, and the lubricating medium pressure in the liquid replenishing channel 33 overcomes the second spring 73 The elastic force pushes the refill valve stem 71 to move away from the middle of the intermediate ring 21, the refill channel 33 is connected with the flow hole 213, the lubricating medium in the liquid storage chamber 5 is released, and the lubricating medium is replenished to the bearing 1. At this time, the second spring 73 is in a stretched state. When the lubricating medium in the gap between the intermediate ring 21 and the pump shaft 4 is restored to supply, and the pressure on the baffle 721 is greater than or equal to the lubricating medium pressure in the refill channel 33, the second spring 73 is reset under the spring force, and the end face of the refill valve ball 711 and the flow hole 213 and the refill channel 33 are restored to abutment.

[0025] The present embodiment also provides a magnetic pump, including a pump body, an impeller, an inner magnetic steel, an outer magnetic steel, an isolation sleeve, a motor, a base, a pump shaft 4 and the above-mentioned magnetic pump sliding bearing structure, wherein the pump body is installed on the base, the pump body is fixedly connected to the pump cover 3, the impeller is arranged in the pump body, the impeller is connected to one end of the pump shaft 4, a return flow channel is opened at the axis center of the pump shaft 4, the return flow channel is connected to the cavity where the impeller is located, a diversion hole is opened radially through the middle part of the pump shaft 4 for lubricating the bearing 1, the inner magnetic steel is connected to the other end of the pump shaft 4, the isolation sleeve is arranged outside the inner magnetic steel, the isolation sleeve is fixedly connected to the pump cover 3, the outer magnetic steel is connected to the output end of the motor, the outer magnetic steel sleeve is arranged outside the isolation sleeve, the motor is installed on the base, and other components are prior art and will not be repeated here.

[0026] When the present embodiment is in use, when the medium of the magnetic pump runs at a standard flow rate, the lubricating medium flows from the inlet of the pump cover 3 through the volume chamber where the impeller is located, the lubricating oil flow channel 31, the return flow channel, the diversion hole and the friction pair of the bearing 1, and then flows back to the inlet of the pump cover 3. At this time, a part of the lubricating medium diverted from the lubricating oil flow channel 31 enters the liquid inlet flow channel 32. The lubricating medium in the liquid inlet flow channel 32 pushes the liquid inlet valve stem 62 to move toward the output side of the valve housing 61, so that the first spring 63 is stretched, and the liquid inlet flow channel 32 is connected with the liquid storage chamber 5. The liquid storage chamber 5 stores liquid, and the liquid storage chamber 5 stores a sufficient amount of lubricating medium. After that, the lubricating medium pressure in the liquid storage chamber 5 is equal to or greater than the lubricating medium pressure in the liquid inlet channel 32, and the first spring 63 is reset under the action of elastic force, and the liquid storage chamber 5 is not connected with the liquid inlet channel 32. At this time, since there is sufficient lubricating medium in the gap between the intermediate ring 21 and the pump shaft 4, the lubricating medium can push the baffle 721 under the action of pressure to make the liquid replenishment valve ball 711 abut against the end face of the connection between the flow hole 213 and the liquid replenishment channel 33, and the liquid replenishment channel 33 is not connected with the flow hole 213; when the medium of the magnetic pump is running at a flow rate lower than the standard flow rate, there is not enough lubricating medium in the gap between the intermediate ring 21 and the pump shaft 4, and the baffle 721 is pressed. The lubricating medium pressure on 721 decreases, and the lubricating medium pressure in the replenishing channel 33 overcomes the elastic force of the second spring 73. The second spring 73 stretches, pushing the replenishing valve stem 71 to move away from the middle of the intermediate ring 21. The replenishing channel 33 is connected with the flow hole 213, and the lubricating medium in the liquid storage chamber 5 flows out from the liquid storage chamber 5 and flows through the replenishing channel 33, the replenishing hole 214, the flow hole 213, the flow channel 22 and the injection hole 11 in turn, thereby replenishing lubrication for the friction pair of the bearing 1; when the medium state in the magnetic pump returns to the standard flow rate, the gap between the intermediate ring 21 and the pump shaft 4 is The supply of internal lubricating medium is restored, the second spring 73 is reset, the liquid replenishing channel 33 is disconnected from the flow hole 213, the lubricating medium pressure in the liquid inlet channel 32 is increased, the first spring 63 is stretched, the liquid inlet channel 32 is connected to the liquid storage chamber 5 again, and the lubricating medium in the liquid inlet channel 32 flows into the liquid storage chamber 5 until the lubricating medium in the liquid storage chamber 5 is sufficiently stored, the first spring 63 is reset, and the liquid inlet channel 32 is disconnected from the liquid storage chamber 5; the bearing 1 can be fully cooled and lubricated during use, the wear of the bearing 1 is greatly reduced, and the service life of the magnetic pump can be greatly extended without introducing external equipment.

[0027] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic pump sliding bearing structure, sleeved on a pump shaft (4), characterized in that: The pump cover (3) comprises a bearing bush (1), a bearing seat (2) and a pump cover (3), wherein two bearing seats (2) are symmetrically arranged, the bearing seats (2) are fixed to the pump cover (3) by bolts, an intermediate ring (21) is arranged between the two bearing seats (2), the bearing bush (1) is installed in the bearing seat (2), a liquid storage cavity (5) is provided in the pump cover (3), the liquid storage cavity (5) is located on one side of the intermediate ring (21), and a liquid replenishing cavity (5) is provided on the pump cover (3) extending from the liquid storage cavity (5) to the intermediate ring (21) A flow channel (33) is provided, a liquid replenishing hole (214) is formed through the side wall of the middle ring (21), two liquid replenishing valves (7) are symmetrically arranged at the liquid replenishing hole (214), the liquid replenishing hole (214) is communicated with the liquid replenishing flow channel (33), a lubricating oil flow channel (31) is provided in the pump cover (3), a liquid inlet flow channel (32) is extended from a side of the lubricating oil flow channel (31) close to the inlet end of the pump cover (3) to the lower part of the liquid storage chamber (5) in the pump cover (3), and a liquid inlet valve (6) is arranged on the liquid inlet flow channel (32).

2. A magnetic pump sliding bearing structure according to claim 1, characterized in that: The liquid inlet valve (6) comprises a valve housing (61); an input side of the valve housing (61) is in communication with a liquid inlet channel (32); an output side of the valve housing (61) is in communication with a liquid storage chamber (5); a clamping plate (611) is provided inside the valve housing (61); a flow hole is provided in the middle of the clamping plate (611).

3. A magnetic pump sliding bearing structure according to claim 2, characterized in that: The liquid inlet valve (6) further comprises a liquid inlet valve stem (62) and a first spring (63); the liquid inlet valve stem (62) is arranged in the valve housing (61); the liquid inlet valve stem (62) passes through the clamping plate (611); one end of the liquid inlet valve stem (62) located on the input side of the valve housing (61) is fixedly connected to a liquid inlet valve ball (621); the first spring (63) is sleeved on the liquid inlet valve stem (62); one end of the first spring (63) is connected to the clamping plate (611); and the other end of the first spring (63) is connected to one end of the liquid inlet valve stem (62) located on the output side of the valve housing (61).

4. A magnetic pump sliding bearing structure according to claim 1, characterized in that: A sealing member is provided between the intermediate ring (21) and the pump cover (3), a sealing ring is provided between the contact surfaces of the intermediate ring (21) and the bearing seat (2), an annular boss is provided in the middle of the inner surface of the intermediate ring (21), a limiting groove (211) is provided at the upper part of the annular boss, the cross section of the limiting groove (211) is H-shaped, an overflow hole (213) is provided at the upper part of the intermediate ring (21), the axis of the limiting groove (211) and the axis of the overflow hole (213) are both parallel to the axis of the intermediate ring (21), the middle part of the overflow hole (213) is connected to the liquid replenishing hole (214), valve stem grooves (212) are symmetrically provided above both sides of the limiting groove (211), the upper end of the valve stem groove (212) is connected to the overflow hole (213), and the lower end of the valve stem groove (212) is connected to the limiting groove (211).

5. A magnetic pump sliding bearing structure according to claim 4, characterized in that: The refill valve (7) comprises a refill valve stem (71) and a sealing ring (72); the refill valve stem (71) is in an inverted L-shape; the upper end of the refill valve stem (71) enters into the flow hole (213) and bends toward the middle of the intermediate ring (21); the end of the bent section of the refill valve stem (71) is fixedly connected to a refill valve ball (711); the lower end of the refill valve stem (71) passes through the valve stem groove (212) and is fixedly connected to the middle of the sealing ring (72); the sealing ring (72) is arranged in the limiting groove (211); the outer surface of the sealing ring (72) abuts against the circumferential surface of the end of the limiting groove (211); and a baffle (721) is arranged in the middle of the sealing ring (72).

6. A magnetic pump sliding bearing structure according to claim 5, characterized in that: The liquid replenishing valve (7) further comprises a second spring (73) and a limiting rod (74); the limiting rod (74) is arranged in the limiting groove (211); one end of the limiting rod (74) away from the middle of the intermediate ring (21) extends into the sealing ring (72) and is fixedly connected to the baffle plate (721); the second spring (73) is sleeved on the limiting rod (74); one end of the second spring (73) is connected to the baffle plate (721); and the other end of the second spring (73) is connected to the step surface of the limiting groove (211).

7. A magnetic pump sliding bearing structure according to claim 4, characterized in that: The upper portion of the bearing seat (2) is provided with a flow channel (22), the axis of the flow channel (22) is aligned with the axis of the flow hole (213), the flow channel (22) is connected to the flow hole (213), and the middle portion of the bearing shell (1) is provided with a liquid injection hole (11) in a radial direction, the axis of the liquid injection hole (11) is perpendicular to the axis of the flow hole (213), and the flow channel (22) is connected to the liquid injection hole (11).

8. A magnetic pump, characterized in that: The invention comprises a pump body, an impeller, an inner magnetic steel, an outer magnetic steel, an isolating sleeve, a motor, a base, a pump shaft (4) and a magnetic pump sliding bearing structure as claimed in any one of claims 1 to 7, wherein the pump body is mounted on the base, the pump body is fixedly connected to the pump cover (3), the impeller is arranged in the pump body, the impeller is connected to one end of the pump shaft (4), a return flow channel is provided at the axis of the pump shaft (4), the return flow channel is connected to the cavity where the impeller is located, a diversion hole is radially penetrated through the middle of the pump shaft (4), the inner magnetic steel is connected to the other end of the pump shaft (4), the isolating sleeve is arranged outside the inner magnetic steel, the isolating sleeve is fixedly connected to the pump cover (3), the outer magnetic steel is connected to the output end of the motor, the outer magnetic steel sleeve is arranged outside the isolating sleeve, and the motor is mounted on the base.

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