High-temperature magnetic drive pump

Abstract

According to the technical scheme, the high-temperature magnetic drive pump is characterized by comprising a motor, a pump body, an impeller, an outer magnet, an inner magnet and a driving shaft, the motor is used for driving the outer magnet to rotate, the inner magnet is arranged in the pump body, one end of the driving shaft is connected with the inner magnet, and the other end of the driving shaft is connected with the impeller; the driving shaft comprises a main shaft and an auxiliary shaft, a sliding cavity is concavely formed in the middle of the main shaft, and the auxiliary shaft is slidably connected into the sliding cavity. An expansion assembly and first meshing teeth are arranged at the bottom of the sliding cavity, and second meshing teeth linked with the first meshing teeth are arranged at the first end of the auxiliary shaft. A guide seat is arranged in the pump body, a guide cavity is formed in the guide seat, the second end of the auxiliary shaft is connected into the guide cavity in a sliding mode, a limiting structure is arranged between the auxiliary shaft and the guide cavity, and the magnetic drive pump can play a role in protecting the driving shaft in a high-temperature state.

Description

Technical Field

[0001] The utility model relates to a magnetic pump, more specifically, to a high-temperature magnetic pump. Background Art

[0002] Magnetic pump, also known as magnetic centrifugal pump or magnetic drive pump, is a new type of product that applies the working principle of permanent magnetic coupling to centrifugal pump.

[0003] During the operation of the magnetic pump, high temperature will occur, so it is necessary to design the cooling, cooling and protection of the magnetic pump. Our company has previously applied for a high-temperature magnetic pump, with the publication number CN212803620U.

[0004] However, during use, the following issues were discovered: Magnetic pumps typically use sliding bearings, which generate heat during operation. This heat can only be dissipated by the circulating medium within the magnetic pump. Therefore, if the medium contains particles, the particles that flow to the sliding bearings can clog the internal circulation channels of the sliding bearings. Furthermore, idling the magnetic pump can cause the sliding bearings to dry-grind, rapidly increasing their temperature. If the sliding bearings are primarily made of engineering plastic, they can expand and seize the shaft, damaging the magnetic pump. If the sliding bearings are made of ceramic, the sudden increase in temperature can cause them to crack, also damaging the magnetic pump. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a high-temperature magnetic pump that can protect the drive shaft under high temperature conditions.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a high-temperature magnetic pump, comprising a motor, a pump body, an impeller, an external magnet, an internal magnet, and a drive shaft, wherein the motor is used to drive the rotation of the external magnet, the internal magnet is arranged in the pump body, one end of the drive shaft is connected to the internal magnet, and the other end is connected to the impeller;

[0007] The drive shaft includes a main shaft and a secondary shaft. A sliding cavity is recessed in the middle of the main shaft, and the secondary shaft is slidably connected in the sliding cavity.

[0008] The bottom of the sliding cavity is provided with an expansion assembly and a first meshing tooth, and the first end of the secondary shaft is provided with a second meshing tooth that is linked to the first meshing tooth;

[0009] A guide seat is provided in the pump body, a guide cavity is provided on the guide seat, the second end of the secondary shaft is slidably connected in the guide cavity, and a limiting structure is provided between the secondary shaft and the guide cavity.

[0010] The utility model further sets up: the main shaft is provided with liquid cavity, be provided with cooling liquid in the liquid cavity.

[0011] The utility model further sets up: the expansion component includes with expansion mouth and expansion cover, expansion mouth sets up in the center of the sliding cavity, and with liquid cavity intercommunication arrangement;

[0012] Expansion cover is installed in expansion mouth.

[0013] The utility model further sets up: the cooling liquid can be alcohol or water-glycerin mixed liquid or silicon oil.

[0014] The utility model further sets up: the limiting structure includes the limit ring and limit spring, be provided with the limit slot in the guide cavity, the limit ring slip connection is in the limit slot, and the limit spring is installed between the limit ring and limit slot.

[0015] The utility model further sets up: the diameter length size of sliding cavity is greater than the diameter length size of auxiliary shaft.

[0016] The utility model further sets up: be provided with the injection port of intercommunication with liquid cavity on the main shaft.

[0017] Summarized above, the utility model has following beneficial effect: through the design of main shaft and expansion component, when the temperature abnormal rise appears in the working process of drive shaft, expansion component is influenced by heating effect, and will appear expansion condition, makes first meshing tooth and second meshing tooth separate, disconnects the transmission effect of main shaft and auxiliary shaft, protects the safety of drive shaft, avoided the loss of rotating member in pump body when high temperature operation.

[0018] The design of the guide seat can ensure the stability of the auxiliary shaft during movement. ACCURACY OF DRAWINGS

[0019] Figure 1 It is high temperature magnetic force pump's three-dimensional structure schematic diagram;

[0020] Figure 2 It is drive shaft's three-dimensional structure schematic diagram;

[0021] Figure 3 It is drive shaft's separation structure schematic diagram;

[0022] Figure 4 It is auxiliary shaft and guide seat's three-dimensional structure schematic diagram;

[0023] Figure 5 It is main shaft's three-dimensional structure schematic diagram.

[0024] Figure numerals: 1. Motor; 2. Pump body; 21. Guide seat; 22. Guide cavity; 23. Limiting groove; 3. Drive shaft; 4. Main shaft; 41. Sliding cavity; 42. First meshing tooth; 5. Secondary shaft; 51. Second meshing tooth; 6. Expansion assembly; 61. Expansion port; 62. Expansion sleeve; 7. Limiting structure; 71. Limiting ring; 72. Limiting spring. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0026] Reference Figures 1 to 5 As shown, in order to achieve the above purpose, the utility model provides the following technical solutions: a high-temperature magnetic pump, including a motor 1, a pump body 2, an impeller, an external magnet, an internal magnet, and a drive shaft 3, wherein the motor 1 is used to drive the rotation of the external magnet, the internal magnet is arranged in the pump body 2, one end of the drive shaft 3 is connected to the internal magnet, and the other end is connected to the impeller;

[0027] A base is installed at the bottom of the motor 1 and the pump body 2. The external magnet is connected to the shaft end of the motor 1. An isolation sleeve is fixed on the pump body 2. The isolation sleeve is arranged between the inner magnet and the outer magnet. The working principle of the external magnet and the inner magnet is common knowledge of magnetic pumps and will not be repeated here.

[0028] The drive shaft 3 includes a main shaft 4 and a secondary shaft 5. A sliding cavity 41 is recessed in the middle of the main shaft 4, and the secondary shaft 5 is slidably connected in the sliding cavity 41.

[0029] The bottom of the sliding cavity 41 is provided with an expansion assembly 6 and a first meshing tooth 42 , and the first end of the secondary shaft 5 is provided with a second meshing tooth 51 that is linked to the first meshing tooth 42 ;

[0030] A guide seat 21 is provided in the pump body 2 , a guide cavity 22 is provided on the guide seat 21 , the second end of the secondary shaft 5 is slidably connected in the guide cavity 22 , and a limiting structure 7 is provided between the secondary shaft 5 and the guide cavity 22 .

[0031] The design of the present invention, through the design of the main shaft 4 and the expansion assembly 6, when the temperature of the drive shaft 3 rises abnormally during operation, the expansion assembly 6 is affected by the thermal effect and expands, causing the first meshing teeth 42 to separate from the second meshing teeth 51, disconnecting the transmission function between the main shaft 4 and the secondary shaft 5, protecting the safety of the drive shaft 3, and avoiding the loss of rotating parts in the pump body 2 during high-temperature operation.

[0032] The design of the guide seat 21 can ensure the smooth movement of the secondary shaft 5 .

[0033] The present invention is further configured as follows: a liquid cavity is provided in the main shaft 4, and a coolant is provided in the liquid cavity.

[0034] The present invention is further configured as follows: the expansion assembly 6 includes an expansion port 61 and an expansion sleeve 62, the expansion port 61 is provided at the center of the sliding cavity 41 and is communicated with the liquid cavity;

[0035] The expansion sleeve 62 is installed at the expansion port 61. With this structural design, when the temperature of the main shaft 4 and the secondary shaft 5 rises during rotation, it can be divided into two stages. When the temperature gradually rises to the first stage, the coolant vaporizes, thereby cooling the main shaft 4 and the secondary shaft 5 inside the main shaft 4;

[0036] When the temperature further rises to the second stage, the coolant further vaporizes, causing the pressure in the liquid chamber to increase. At this time, the pressure will gradually act on the pressure relief port, causing the expansion sleeve 62 to expand outward, thereby pushing the secondary shaft 5 to move upward, separating the two transmission teeth, and making the main shaft 4 approximately in an idling state, thereby avoiding the loss of rotating parts in the pump body 2 during high-temperature operation.

[0037] The coolant can be alcohol, a water-glycerin mixture, or silicone oil. The type of coolant can be selected based on factors such as the usage scenario, speed, boiling point, etc., including but not limited to the types listed above.

[0038] The present invention is further configured as follows: the limiting structure 7 includes a limiting ring 71 and a limiting spring 72, a limiting groove 23 is provided in the guide cavity 22, the limiting ring 71 is slidably connected in the limiting groove 23, and the limiting spring 72 is installed between the limiting ring 71 and the limiting groove 23.

[0039] When the expansion sleeve 62 protrudes outward, it will push the secondary shaft 5 to move axially. At this time, the limiting ring 71 slides in the limiting groove 23 and compresses the limiting spring 72. When the expansion sleeve 62 is reset, the secondary shaft 5 will move back under the action of the limiting spring 72. At this time, adjusting the position of the main shaft 4 can make the first meshing teeth 42 and the second meshing teeth 51 re-engage.

[0040] The radial length of the sliding cavity 41 is greater than the radial length of the secondary shaft 5 .

[0041] The present invention is further configured as follows: an injection port communicating with the liquid cavity is provided on the main shaft 4. The design of the injection port enables the replacement of the coolant.

[0042] The above are only preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-temperature magnetic pump, comprising a motor (1), a pump body (2), an impeller, an external magnet, an internal magnet, and a drive shaft (3), wherein the motor (1) is used to drive the rotation of the external magnet, the internal magnet is arranged in the pump body (2), one end of the drive shaft (3) is connected to the internal magnet, and the other end is connected to the impeller; Its characteristics are: The drive shaft (3) includes a main shaft (4) and a secondary shaft (5); a sliding cavity (41) is recessed in the middle of the main shaft (4), and the secondary shaft (5) is slidingly connected in the sliding cavity (41); The bottom of the sliding cavity (41) is provided with an expansion assembly (6) and a first meshing tooth (42), and the first end of the secondary shaft (5) is provided with a second meshing tooth (51) linked to the first meshing tooth (42); A guide seat (21) is provided in the pump body (2), a guide cavity (22) is provided on the guide seat (21), the second end of the secondary shaft (5) is slidably connected in the guide cavity (22), and a limiting structure (7) is provided between the secondary shaft (5) and the guide cavity (22).

2. A high-temperature magnetic pump according to claim 1, characterized in that: A liquid cavity is provided in the main shaft (4), and a coolant is provided in the liquid cavity.

3. A high-temperature magnetic pump according to claim 2, characterized in that: The expansion assembly (6) includes an expansion port (61) and an expansion sleeve (62), wherein the expansion port (61) is arranged at the center of the sliding cavity (41) and is in communication with the liquid cavity; The expansion sleeve (62) is installed at the expansion port (61).

4. A high-temperature magnetic pump according to claim 2, characterized in that: The cooling liquid can be alcohol, a water-glycerin mixture or silicone oil.

5. A high-temperature magnetic pump according to claim 1, characterized in that: The limiting structure (7) comprises a limiting ring (71) and a limiting spring (72); a limiting groove (23) is provided in the guide cavity (22); the limiting ring (71) is slidably connected in the limiting groove (23); and the limiting spring (72) is installed between the limiting ring (71) and the limiting groove (23).

6. A high-temperature magnetic pump according to claim 1, characterized in that: The radial length of the sliding cavity (41) is greater than the radial length of the secondary shaft (5).

7. A high-temperature magnetic pump according to claim 2, characterized in that: The main shaft (4) is provided with an injection port communicating with the liquid cavity.

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