Horizontal permanent-magnetic cooling shield pump

Abstract

This invention relates to the field of pumps, and more particularly to a horizontal permanent magnet cooled shielded pump, comprising a base, a housing fixed on the base, a pump shaft at the center of the housing, a permanent magnet rotor connected to the pump shaft, a stator connected to the permanent magnet rotor, and the stator fixed to the inner wall of the housing. The stator and the permanent magnet rotor have front-end shielding structures and rear-end shielding structures at their front and rear ends, respectively. The pump shaft has front-end bearings and rear-end bearings. A pump body is fixed to the front end of the housing, and a pump cover is provided between the pump body and the housing. A pump cavity is provided inside the pump body, and the front end of the pump shaft extends into the pump cavity, with an impeller fixed to the front end of the pump shaft. This invention achieves circulating cooling of the pump shaft, stator, and permanent magnet rotor through internal circulation, greatly improving cooling efficiency and effectiveness. Cooling the shielded pump through internal circulation results in a compact overall structure, facilitating installation and significantly saving installation space. Furthermore, it eliminates the need for additional cooling power and cooling liquid, saving energy and resources.

Description

Technical Field

[0001] This invention relates to the field of pumps, and more particularly to a horizontal permanent magnet cooled shielded pump. Background Technology

[0002] A canned motor pump is a leak-free pump that integrates the pump and motor in a single design. It is widely used in industrial applications involving the transport of flammable, explosive, toxic, corrosive, or valuable liquids. By fixing the motor rotor and pump impeller to the same shaft and completely sealing the motor stator and rotor with a shielding sleeve, the entire rotor is immersed in the transported medium. Power is transmitted through the stator's magnetic field, thus completely eliminating the mechanical seal required in traditional pumps. This "static seal" structure achieves complete leak-free operation, significantly improving system safety and environmental friendliness. Patent application number CN202121512797.5 discloses a self-cooling shielded pump. The specific cooling principle of this shielded pump is as follows: the medium is introduced through the inlet pipe and discharged through the outlet pipe. Part of the medium enters the top of the pump body through the cooling pipe for circulation. During the circulation process, the motor is controlled to rotate, and the first and second cranks are controlled to rotate. A pair of gears mesh and move in the gear key, controlling the slider to move up and down reciprocally. Cooling water is introduced from the outside through the cooling hose into the cooling short pipe, which cools the cooling pipe by reciprocating up and down, thereby accelerating the cooling speed of the medium in the cooling pipe and achieving the cooling of the medium. However, this structure also has the following drawbacks in the cooling process of the shielded pump: the external circulation method is not only complex in structure and not conducive to installation, but also requires an additional circulation motor and sufficient cooling water, wasting energy and resources. Therefore, there is an urgent need for a shielded pump with a simple structure that can achieve internal cooling through its own internal circulation and has a good cooling effect. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention aims to provide a horizontal permanent magnet cooled shielded pump, solving the problems existing in the prior art. This invention achieves circulating cooling of the pump shaft, stator, and permanent magnet rotor through internal circulation, greatly improving the cooling efficiency and effect. Cooling the shielded pump through internal circulation results in a compact overall structure, facilitating installation and significantly saving installation space. Furthermore, it eliminates the need for additional cooling power and cooling liquid, saving energy and resources. The use of front-end and rear-end shielding structures transforms the dynamic seal into a static seal, preventing dynamic seal leakage.

[0004] (II) Technical Solution

[0005] To achieve the above objectives, the present invention provides the following technical solution: A base is included, a housing is fixed on the base, a pump shaft is located at the center of the housing, a permanent magnet rotor is connected to the pump shaft, a stator is connected to the permanent magnet rotor, the stator is fixed to the inner wall of the housing, a front shielding structure and a rear shielding structure are respectively provided at the front and rear ends of the stator and the permanent magnet rotor, a front bearing and a rear bearing are provided on the pump shaft, a pump body is fixed at the front end of the housing, a pump cover is provided between the pump body and the housing, a pump cavity is provided inside the pump body, the front end of the pump shaft extends into the pump cavity, and an impeller is fixed at the front end of the pump shaft, a channel connecting the front and rear ends is provided at the center of the pump shaft.

[0006] Preferably, the rear end of the channel is detachably connected to an exhaust bolt, and the rear end of the housing is detachably connected to a rear end cover.

[0007] Preferably, the front shielding structure includes a first support structure fixed to the front end of the stator, a second support structure below the first support structure, the second support structure being located on the front side of the permanent magnet rotor, a front shielding sleeve being provided at the front end of the housing, the front end of the first support structure, and the junction of the first and second support structures, a front sealing gasket being provided between the front shielding sleeve and the pump cover, and a third support structure being filled between the front shielding sleeve and the pump cover.

[0008] Preferably, the rear shielding structure includes a fourth support structure fixed to the rear end of the stator, a fifth support structure fixed below the fourth support structure, the fifth support structure being located on the rear side of the permanent magnet rotor, a rear shielding sleeve being provided at the junction of the fourth and fifth support structures, the rear side of the fifth support structure, the junction of the rear bearing and the rear cover, and part of the inner edge of the rear cover, a rear sealing gasket and an O-ring being provided between the rear shielding sleeve and the rear cover, and a sixth support structure being provided between the rear shielding sleeve and the rear cover.

[0009] Preferably, a filter plate is provided at the front end of the channel, and several C-shaped channels are provided on the pump shaft, with both ends of the C-shaped channels connected to the channel.

[0010] Preferably, a support frame is provided between the rear bearing and the rear shield sleeve. The support frame, the vent bolt, and the rear cover form a cavity. A heat dissipation mechanism is detachably connected to the outer wall of the vent bolt.

[0011] Preferably, the heat dissipation mechanism includes an annular block detachably connected to the outer wall of the exhaust bolt, and a plurality of fan blades are uniformly fixed on the outer wall of the annular block. The fan blades include a first skeleton layer and a second skeleton layer fixed on the annular block, and a graphite soft felt layer is fixed between the first skeleton layer and the second skeleton layer.

[0012] Preferably, the support frame has a socket hole that matches the outer wall surface of the exhaust bolt.

[0013] Preferably, the C-shaped channel is provided with an inlet and an outlet, and a movable cover is provided at the outlet. A spring is fixed on the bottom surface of the movable cover, the spring extends into the C-shaped channel, and the end of the spring extending into the C-shaped channel is fixed to a grid plate, which is fixed to the inner wall of the C-shaped channel.

[0014] Preferably, two intersecting arc-shaped plates are fixed on the top surface of the movable cover.

[0015] (III) Beneficial Effects

[0016] 1. This invention utilizes internal circulation to circulate and cool the pump shaft, stator, and permanent magnet rotor, significantly improving cooling efficiency and effectiveness. Cooling the canned motor pump through internal circulation results in a compact overall structure, facilitating installation and saving considerable installation space. Furthermore, it eliminates the need for additional cooling power and coolant, conserving energy and resources. The use of front and rear shielding structures transforms the dynamic seal into a static seal, preventing dynamic seal leakage.

[0017] 2. This invention, through the installation of vent bolts, allows the medium within the channel to seep out through the gap between the pump shaft's rear end face and the vent bolts. This controls the amount of medium entering the pump at once, preventing excessive leakage that could damage the stator and permanent magnet rotor. The removable rear end cover and vent bolts also allow for periodic venting of the canned motor pump, preventing cavitation and protecting the pump.

[0018] 3. The present invention sets the front shielding structure to consist of a first support structure, a second support structure, a front shielding sleeve, and a third support structure, which provides a good stable support and a good shielding and sealing effect, thus protecting the stator. At the same time, it guides the medium passing through the gap between the stator and the permanent magnet rotor to the front bearing for cooling and lubrication.

[0019] 4. By setting the rear shielding structure to consist of a fourth support structure, a fifth support structure, and a rear shielding sleeve, this invention provides both a strong supporting function and a good shielding and sealing function, thus providing excellent protection for the permanent magnet rotor and stator. At the same time, the rear shielding sleeve guides the medium flowing out from the rear end of the channel to the rear bearing and the gap between the permanent magnet rotor and stator, thereby cooling and lubricating the bearing and the junction between the permanent magnet rotor and stator.

[0020] 5. This invention filters the medium entering the channel through a filter plate, removing impurities mixed in the medium and ensuring the cleanliness of the medium entering the shielded pump, thereby protecting the shielded pump. By using a C-shaped channel, the medium inside the channel is thrown into the C-shaped channel due to centrifugal force during pump shaft rotation. That is, the medium enters from one end of the C-shaped channel along the direction of centrifugal force and then returns to the channel from the other end. This process greatly expands the cooling range of the pump shaft, making cooling more comprehensive and significantly improving the cooling effect. On the other hand, since the ambient temperature of the canned motor pump is relatively high, and the pump shaft temperature is also relatively high during operation, the C-shaped channel allows the medium to be partially or completely vaporized as it passes through. This vaporization process absorbs a large amount of heat, greatly enhancing the cooling effect on the pump shaft. Furthermore, the vaporization of the medium in the C-shaped channel accelerates the replenishment of the medium in the channel from the pump chamber. Since the temperature of the medium in the pump chamber is often lower than that in the channel, the accelerated replenishment helps lower the overall temperature of the medium in the channel, thereby reducing the overall temperature of the circulating medium and further improving the cooling effect.

[0021] 6. This invention provides excellent support for the rear shielding sleeve through the support frame, thereby enhancing the interaction force between the shielding sleeve and the rear sealing gasket and O-ring, thus improving the stability and sealing effect of the shielding sleeve. The cavity design facilitates the installation of the heat dissipation mechanism. The annular block and fan blades form a fan structure. When the pump shaft rotates, it drives the exhaust bolt to rotate, which in turn drives the fan blades, thus providing air cooling for the cavity and surrounding components without requiring additional power, achieving energy savings. The support frame, exhaust bolt, and other structures are also effectively cooled. Therefore, the process of the medium seeping from the junction of the channel and the exhaust bolt to the junction of the support frame and the rear bearing also cools the medium, greatly improving the cooling effect of the subsequent medium on the rear bearing, permanent magnet rotor, and stator.

[0022] 7. The present invention configures the fan blade to be composed of a first skeleton layer, a second skeleton layer and a graphite soft felt layer. On the one hand, this makes the fan blade have a stable and solid structure. On the other hand, the graphite soft felt has the function of rapid heat conduction, which can quickly conduct heat to the junction of the support frame and the rear bearing that are close to it, thereby further improving the cooling effect on the medium flowing through it.

[0023] 8. This invention, through the design of the sleeve hole, allows the support frame to be fitted onto the vent bolt. This does not affect the rotation of the vent bolt; furthermore, as the medium permeates outward from the channel, some medium enters the interface between the support frame and the rear bearing, participating in the internal circulation, while some medium passes through the interface between the vent bolt and the support frame, providing lubrication and cooling. Since the vent bolt is continuously rotating during operation, the temperature at the interface between the vent bolt and the support frame is relatively high. In addition, the amount of medium permeating to this area is relatively small, so the small amount of medium that permeates will vaporize under high temperature conditions. In other words, the medium vaporizes after lubricating this area, improving the cooling effect while ensuring that the medium does not flow into the cavity.

[0024] 9. The present invention greatly improves the efficiency and uniformity of cooling by setting up a movable cover plate, spring, mesh plate and arc plate. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall invention.

[0026] Figure 2 For the present invention Figure 1 A schematic diagram showing the addition of a filter plate and a C-shaped channel.

[0027] Figure 3 This is a schematic diagram of the front shielding sleeve of the present invention.

[0028] Figure 4 This is a schematic diagram of the rear shielding sleeve of the present invention.

[0029] Figure 5 This is a partial schematic diagram of the present invention.

[0030] Figure 6 This is a schematic diagram of the support frame of the present invention and the socket provided thereon.

[0031] Figure 7 This is a schematic diagram of the exhaust bolt, annular block, and fan blade of the present invention.

[0032] Figure 8 This is a schematic diagram of the annular block and fan blades of the present invention.

[0033] Figure 9 For the present invention Figure 7 Left view or right view.

[0034] Figure 10 This is a schematic diagram of the present invention after a portion of the pump shaft has been cut off and a movable cover plate, spring, mesh plate and arc plate have been added to the C-shaped structure.

[0035] In the diagram: 1-Base, 2-Housing, 3-Pump Shaft, 4-Permanent Magnet Rotor, 5-Stator, 6-Front-end Shielding Structure, 7-Rear-end Shielding Structure, 8-Front-end Bearing, 9-Rear-end Bearing, 10-Pump Body, 11-Pump Cover, 12-Pump Chamber, 13-Impeller, 14-Channel, 15-Exhaust Bolt, 16-Rear-end Cover, 17-First Support Structure, 18-Second Support Structure, 19-Front Shielding Sleeve, 20-Front Sealing Gasket, 21-Third Support Structure, 22-Fourth Support Structure, 23-Fifth Support Structure, 24-Rear Shielding Sleeve, 25-Rear Sealing Gasket, 26-O-ring, 27-Sixth Support Structure, 28-Filter Plate, 29- C-shaped channel, 30-inlet, 31-outlet, 32-first transverse section, 33-first longitudinal section, 34-second transverse section, 35-second longitudinal section, 36-protrusion, 37-third transverse section, 38-third longitudinal section, 39-fourth transverse section, 40-fourth longitudinal section, 41-fifth transverse section, 42-support frame, 43-cavity, 44-heat dissipation mechanism, 45-ring block, 46-fan blade, 47-first skeleton layer, 48-second skeleton layer, 49-graphite soft felt layer, 50-sleeve hole, 51-liquid inlet, 52-liquid outlet, 53-movable cover plate, 54-spring, 55-mesh plate, 56-arc plate. Detailed Implementation

[0036] The following will refer to the appendices in the embodiments of the present invention. Figure 1-10 The technical solutions in the embodiments of the present invention have been clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] This invention provides a technical solution: a horizontal permanent magnet cooling shielded pump, comprising a base 1, a housing 2 fixed on the base 1, a pump shaft 3 at the center of the housing 2, a permanent magnet rotor 4 connected to the pump shaft 3, a stator 5 connected to the permanent magnet rotor 4, the stator 5 fixed to the inner wall of the housing 2, a front shielding structure 6 and a rear shielding structure 7 respectively provided at the front and rear ends of the stator 5 and the permanent magnet rotor 4, a front bearing 8 and a rear bearing 9 provided on the pump shaft 3, a pump body 10 fixed at the front end of the housing 2, a pump cover 11 provided between the pump body 10 and the housing 2, a pump chamber 12 provided inside the pump body 10, the front end of the pump shaft 3 extending into the pump chamber 12, and an impeller 13 fixed at the front end of the pump shaft 3, a channel 14 connecting the front and rear ends provided at the center of the pump shaft 3. The pump body 10 is provided with an inlet 30 and an outlet 31. During operation, an inlet pipe is connected to the inlet 30, and an outlet pipe is connected to the outlet 31. The canned motor pump is then fixed in a suitable location, which can be the medium to be transported. The pump is then started, the permanent magnet rotor 4 rotates, which in turn drives the pump shaft 3 to rotate, which in turn drives the impeller 13 to rotate. The medium is drawn into the pump chamber 12 through the inlet pipe and inlet 30, and enters the outlet pipe from the outlet 31, and is then transported to the required location through the outlet pipe. After the impeller 13 draws the medium into the pump chamber 12, a small portion of the medium enters the channel 14 inside the pump shaft 3 to cool the pump shaft 3. After passing through the channel 14, the medium passes through the gap between the rear shielding structures 7 to cool the rear bearing 9, and then enters the gap between the permanent magnet rotor 7 and the stator 5 to cool the permanent magnet rotor 7 and the stator 5. After that, it passes through the gap between the front shielding structures 6 to cool the front bearing 8, and then returns to the pump chamber 12, thus achieving internal circulating cooling. A balance hole can be provided on the impeller 13, through which the medium returns to the pump chamber 12. The method of providing a balance hole on the impeller 13 is existing technology and will not be elaborated further. This internal circulation structure is not only compact and easy to install, greatly saving installation space, but also conserves energy and resources. Simultaneously, it provides circulating cooling for the pump shaft 3, stator 5, and permanent magnet rotor 7, significantly improving cooling efficiency and effectiveness. Through the front-end shielding structure 6 and the rear-end shielding structure 7, the dynamic seal is converted into a static seal, eliminating dynamic seal leakage.

[0038] A vent bolt 15 is detachably connected to the rear end of channel 14, and a rear end cover 16 is detachably connected to the rear end of housing 2. The rear end of pump shaft 3 has a threaded hole matching the vent bolt 15. In operation, the vent bolt 15 is screwed onto the rear end of pump shaft 3, and the medium in channel 14 seeps out through the gap between the rear end face of pump shaft 3 and the vent bolt 15. This controls the amount of medium, preventing excessive leakage that could damage stator 5 and permanent magnet rotor 4. Since canned motor pumps are mostly used in high-temperature environments, and due to the internal circulation of the medium, a significant amount of water vapor inevitably accumulates inside the pump. Excessive water vapor buildup can cause cavitation, damaging the pump. Therefore, the detachable rear end cover 16 and vent bolt 15 are used to periodically vent the pump. When venting is needed, simply open the rear end cover 16 and unscrew the vent bolt 15 to release the air, thus preventing cavitation and protecting the canned motor pump.

[0039] The front shielding structure 6 includes a first support structure 17 disposed at the front end of the stator 5, a second support structure 18 disposed below the first support structure 17, the second support structure 18 disposed at the front side of the permanent magnet rotor 4, a front shielding sleeve 19 disposed at the front end of the housing 2, the front end of the first support structure 17, and the junction of the first support structure 17 and the second support structure 18, a front sealing gasket 20 disposed between the front shielding sleeve 19 and the pump cover 11, and a third support structure 21 filling the space between the front shielding sleeve 19 and the pump cover 11. This is the specific structure of the front-end shielding structure 6. The first support structure 17 is used to fill the front end of the stator 5. It can be a single support block or composed of several support blocks welded together. The outer and inner walls of the first support structure 17 are both irregular and zigzag-shaped. The outer wall of the first support structure 17 is fixedly connected to the inner wall of the housing 2, and its rear end is fixedly connected to the front end of the stator 5. The zigzag-shaped outer wall makes the fixation between the first support structure 17 and the housing 2 more secure and greatly improves the sealing between them, thus providing a good seal for the stator 5. The outer wall of the second support structure 18 matches the inner wall of the first support structure 17 and is also zigzag-shaped. The outer wall of the second support structure 18 is spliced ​​together with the inner wall of the first support structure 17. The front shielding sleeve 19 includes a first transverse portion 32, a first longitudinal portion 33, a second transverse portion 34, and a second longitudinal portion 35. An embedding groove for the first transverse portion 32 is provided at the junction of the outer wall of the second support structure 18 and the front end of the inner wall of the first support structure 17. A protrusion 36 is fixed to the lower part of the front end face of the first support structure 17. The first longitudinal portion 33 covers the front end face of the protrusion 36, the second transverse portion 34 covers the outer wall of the protrusion 36, and the second longitudinal portion 35 covers the upper part of the front end face of the first support structure 17 and the front end face of the housing 2. The front sealing gasket 20 seals the pump cover 11 and the front shielding sleeve 19, preventing the medium in the pump chamber 12 from corroding the interior of the stator 5, thus providing excellent sealing and protection for the stator 5. The third support structure 21 fills the space formed by the pump cover 9, the second support structure 18, and the front shielding sleeve 19. The front shielding structure 6 of this structure provides both a strong support and a good shielding and sealing effect, thus protecting the stator 5. At the same time, it guides the medium passing through the gap between the stator 5 and the permanent magnet rotor 4 to the front bearing 8 for cooling and lubrication.

[0040] The rear-end shielding structure 7 includes a fourth support structure 22 located at the rear end of the stator 5. A fifth support structure 23 is fixed below the fourth support structure 22. The fifth support structure 23 is located on the rear side of the permanent magnet rotor 4. A rear shielding sleeve 24 is provided at the junction of the fourth support structure 22 and the fifth support structure 23, on the rear side of the fifth support structure 23, at the junction of the rear-end bearing 9 and the rear-end cover 16, and at part of the inner edge of the rear-end cover 16. A rear sealing gasket 25 and an O-ring 26 are provided between the rear shielding sleeve 24 and the rear-end cover 16. A sixth support structure 27 is provided between the rear shielding sleeve 24 and the rear-end cover 16. This is the specific structure of the rear-end shielding structure 7. The fourth support structure 22 is used to fill the space between the rear end of the stator 5 and the housing 2. The fifth support structure 23 is located at the rear end of the permanent magnet rotor, and its outer wall is spliced ​​with the inner wall of the fourth support structure 22. The outer wall of the fifth support structure 23 is shorter than the inner wall of the fourth support structure 22. The rear shielding sleeve 24 includes a third transverse portion 37, a third longitudinal portion 38, a fourth transverse portion 39, a fourth longitudinal portion 40, and a fifth transverse portion 41. The third transverse portion 37 is located at the junction of the outer wall of the fifth support structure 23 and the inner wall of the fourth support structure 22. The third longitudinal portion 38 wraps around the rear end face of the fifth support structure 23. The fourth transverse portion 39 is located between the rear end bearing 9 and the rear end cover 16. The fourth longitudinal portion 40 and the fifth transverse portion 41 are in close contact with the front end face of the rear end cover 16. The sixth support structure 27 fills the space enclosed by the third transverse portion 37, the third longitudinal portion 38, and the fourth transverse portion 39, providing support for the rear shielding sleeve 24 and improving its shielding and sealing effect. The rear sealing gasket 25 and the O-ring 26 provide a double seal, preventing external media from corroding the interior of the permanent magnet rotor 4 and the stator 5, thus providing excellent protection for their interiors. The rear shielding structure 7 of this structure provides both a strong support and a good shielding and sealing effect, which effectively protects the permanent magnet rotor 4 and stator 5. At the same time, the rear shielding sleeve 24 guides the medium flowing out from the rear end of the channel 14 to the rear bearing 9 and the gap between the permanent magnet rotor 4 and stator 5, thereby cooling and lubricating the bearing 9 and the junction between the permanent magnet rotor 4 and stator 5.

[0041] A filter plate 28 is provided at the front end of channel 14, and several C-shaped channels 29 are provided on the pump shaft 3, with both ends of the C-shaped channels 29 connected to channel 14. The filter plate 28 filters the medium entering channel 14, removing impurities to ensure the cleanliness of the medium entering the canned pump and thus protecting it. Through the C-shaped channels 29, during the rotation of the pump shaft 3, the medium in channel 14 is thrown into the C-shaped channels 29 due to centrifugal force. That is, the medium enters from one end of the C-shaped channel 29 along the direction of centrifugal force and then returns to channel 14 from the other end. This process greatly increases the cooling range of the pump shaft 3, making the cooling more comprehensive and significantly improving the cooling effect. On the other hand, since the ambient temperature of the canned motor pump is relatively high, and the temperature of the pump shaft 3 is also relatively high during operation, the C-shaped channel 29 is designed so that the medium is partially or completely vaporized as it passes through the C-shaped channel 29. This vaporization process absorbs a large amount of heat, thereby greatly improving the cooling effect on the pump shaft 3. Furthermore, the vaporization of the medium within the C-shaped channel 29 accelerates the replenishment of the medium in the channel 14 from the pump chamber 12. Since the temperature of the medium in the pump chamber 12 is often lower than that in the channel 14, the accelerated replenishment rate helps to lower the overall temperature of the medium within the channel, thus reducing the overall temperature of the circulating medium and improving the cooling effect.

[0042] A support frame 42 is provided between the rear bearing 9 and the rear shielding sleeve 24. The support frame 42, the vent bolt 15, and the rear cover 16 form a cavity 43. A heat dissipation mechanism 44 is detachably connected to the outer wall of the vent bolt 15. The heat dissipation mechanism 44 includes an annular block 45 detachably connected to the outer wall of the vent bolt 15. A plurality of fan blades 46 are uniformly fixed on the outer wall of the annular block 45. The fan blades 46 include a first skeleton layer 47 and a second skeleton layer 48 fixed on the annular block 45. A graphite soft felt layer 49 is fixed between the first skeleton layer 47 and the second skeleton layer 48. The support frame 42 provides good support for the rear shielding sleeve 24, thereby enhancing the interaction force between the shielding sleeve 24 and the rear sealing gasket 25 and O-ring 26, thus improving the stability and sealing effect of the shielding sleeve 24. The support frame 42 is made relatively thin, so that a relatively large space is formed inside the support frame 42. This space, together with the space between the exhaust bolt 15 and the rear cover 16, forms a cavity 43. The cavity 43 facilitates the setting of the heat dissipation mechanism 44. The annular block 45 and the fan blade 46 form a fan structure. When the pump shaft 3 rotates, it drives the exhaust bolt 15 to rotate, which in turn drives the fan blade 46 to rotate, thereby cooling the cavity 43 and the components around the cavity 43 without providing additional power, thus achieving an energy-saving effect. The medium in channel 14 first seeps out from the junction of channel 14 and exhaust bolt 15 to the junction of support frame 42 and rear bearing 9. Since the support frame 42 is effectively cooled by the heat dissipation mechanism 44, the support frame 42, exhaust bolt 15, and other structures are also effectively cooled. Therefore, the process of the medium seeping out from the junction of channel 14 and exhaust bolt 15 to the junction of support frame 42 and rear bearing 9 is also a cooling process for the medium, thereby greatly improving the cooling effect of the subsequent medium on the rear bearing 9, permanent magnet rotor 4, and stator 5. The first skeleton layer 47 and the second skeleton layer 48 are both set in a mesh shape, and the graphite soft felt layer 49 is fixed between the first skeleton layer 47 and the second skeleton layer 48. Through the setting of the fan blade 46 in this structure, on the one hand, the fan blade 46 has a stable and firm structure, and on the other hand, the graphite soft felt 49 has a rapid heat conduction function, which can quickly conduct heat to the junction of support frame 42 and rear bearing 9 that is close to it, thereby further improving the cooling effect of the medium flowing through this area.

[0043] The support frame 42 has a fitting hole 50 that matches the outer wall surface of the vent bolt 15. The diameter of the fitting hole 50 is equal to the outer diameter of the vent bolt 15, so that the vent bolt 15 fits perfectly into the fitting hole 50. Both the outer wall surface of the vent bolt 15 and the wall surface of the fitting hole 50 are made smooth. This ensures that the rotation of the vent bolt 15 is not affected. Furthermore, as the medium permeates outward from the channel 14, some of the medium enters the junction between the support frame 42 and the rear bearing 9 to participate in the internal circulation, while some of the medium passes through the junction between the vent bolt 15 and the support frame 42, providing lubrication and cooling to this junction. Since the vent bolt 15 is continuously rotating during operation, the temperature at the junction between the vent bolt 15 and the support frame 42 is relatively high. In addition, the amount of medium permeating into this junction is relatively small, so the small amount of medium that permeates into this junction will vaporize under high temperature conditions. In other words, the medium will vaporize after lubricating this junction, improving the cooling effect and ensuring that the medium does not flow into the cavity 43.

[0044] The C-shaped channel 29 is provided with an inlet 51 and an outlet 52. A movable cover 53 is provided at the outlet 52. A spring 54 is fixed on the bottom surface of the movable cover 53. The spring 54 extends into the C-shaped channel 29. The end of the spring 54 extending into the C-shaped channel 29 is fixed on a grid plate 55. The grid plate 55 is fixed on the inner wall of the C-shaped channel 29. During operation, the pump shaft 3 rotates, and under the action of centrifugal force, the medium in the channel 14 enters from the inlet 51. At the same time, under the action of centrifugal force, the movable cover 53, which was originally covering the outlet 52, is thrown away from the outlet 52. The moment the movable cover 53 is thrown away, the speed at which the medium enters the C-shaped channel 29 is greatly increased, thereby improving the cooling effect. In addition, due to the action of the spring 54 and centrifugal force, the movable cover 53 shakes relatively irregularly in the channel 14 after being thrown away from the outlet 52. This shaking plays a role in stirring and mixing the medium in the channel 14, making the temperature of the medium in the channel more uniform, thereby improving the uniformity of cooling.

[0045] Two intersecting arc-shaped plates 56 are fixed on the top surface of the movable cover plate 53. The arrangement of the two intersecting arc-shaped plates 56 greatly enhances the mixing amplitude of the medium in the channel 14, thereby improving the mixing effect. On the other hand, the bottom of the two intersecting arc-shaped plates 56 forms an arched top. Thus, during the mixing of the medium in the channel 14, the spring 54 needs to overcome greater resistance to pull the movable cover plate 53 back to the liquid outlet 52. This setting effectively prevents the movable cover plate 53 from closing the liquid outlet 52 again during operation, thereby not affecting the circulation of the medium in the C-shaped channel 29.

[0046] Working Principle: During operation, an inlet pipe is connected to the inlet 30, and an outlet pipe is connected to the outlet 31. The canned motor pump is then fixed in a suitable location, which can be the medium to be transported. The pump is then started, the permanent magnet rotor 4 rotates, which in turn drives the pump shaft 3 to rotate, which in turn drives the impeller 13 to rotate. The medium is drawn into the pump chamber 12 through the inlet pipe and inlet 30, and enters the outlet pipe from outlet 31, where it is transported to the desired location. After the impeller 13 draws the medium into the pump chamber 12, a small portion of the medium enters the channel 14 within the pump shaft 3 to cool it. After passing through channel 14, the medium passes through the gaps between the rear shielding structures 7 to cool the rear bearing 9, then enters the gap between the permanent magnet rotor 7 and the stator 5, further cooling them. Finally, it passes through the gaps in the front shielding structure 6 to cool the front bearing 8, and then returns to the pump chamber 12, thus achieving internal circulating cooling. A balance hole can be provided on the impeller 13, through which the medium returns to the pump chamber 12. The method of providing a balance hole on the impeller 13 is existing technology and will not be elaborated further. This internal circulation structure is not only compact and easy to install, greatly saving installation space, but also conserves energy and resources. Simultaneously, it provides circulating cooling for the pump shaft 3, stator 5, and permanent magnet rotor 7, significantly improving cooling efficiency and effectiveness. Through the front-end shielding structure 6 and the rear-end shielding structure 7, the dynamic seal is converted into a static seal, eliminating dynamic seal leakage.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A horizontal permanent magnet cooling shielded pump, characterized in that, The device includes a base (1), on which a housing (2) is fixed. A pump shaft (3) is provided at the center of the housing (2). A permanent magnet rotor (4) is connected to the pump shaft (3). A stator (5) is connected to the permanent magnet rotor (4). The stator (5) is fixed on the inner wall of the housing (2). A front shielding structure (6) and a rear shielding structure (7) are provided at the front end and rear end of the stator (5) and the permanent magnet rotor (4), respectively. A front bearing (8) and a rear bearing (9) are provided on the pump shaft (3). A pump body (10) is fixed at the front end of the housing (2). A pump cover (11) is provided between the pump body (10) and the housing (2). A pump chamber (12) is provided inside the pump body (10). The front end of the pump shaft (3) extends into the pump chamber (12). An impeller (13) is fixed at the front end of the pump shaft (3). A channel (14) connecting the front and rear ends is provided at the center of the pump shaft (3).

2. A horizontal permanent magnet cooling shielded pump according to claim 1, characterized in that, The rear end of the channel (14) is detachably connected to an exhaust bolt (15), and the rear end of the housing (2) is detachably connected to a rear end cover (16).

3. A horizontal permanent magnet cooling shielded pump according to claim 1, characterized in that, The front shielding structure (6) includes a first support structure (17) fixed to the front end of the stator (5), a second support structure (18) is provided below the first support structure (17), the second support structure (18) is provided on the front side of the permanent magnet rotor (4), a front shielding sleeve (19) is provided at the front end of the housing (2), the front end of the first support structure (17) and the junction of the first support structure (17) and the second support structure (18), a front sealing gasket (20) is provided between the front shielding sleeve (19) and the pump cover (11), and a third support structure (21) is filled between the front shielding sleeve (19) and the pump cover (11).

4. A horizontal permanent magnet cooling shielded pump according to claim 2, characterized in that, The rear shielding structure (7) includes a fourth support structure (22) fixed to the rear end of the stator (5), a fifth support structure (23) fixed below the fourth support structure (22), the fifth support structure (23) being disposed on the rear side of the permanent magnet rotor (4), a rear shielding sleeve (24) being provided at the junction of the fourth support structure (22) and the fifth support structure (23), the rear side of the fifth support structure (23), the junction of the rear bearing (9) and the rear cover (16), and part of the inner edge of the rear cover (16), a rear sealing gasket (25) and an O-ring (26) being provided between the rear shielding sleeve (24) and the rear cover (16), and a sixth support structure (27) being provided between the rear shielding sleeve (24) and the rear cover (16).

5. A horizontal permanent magnet cooling shielded pump according to claim 1, characterized in that, A filter plate (28) is provided at the front end of the channel (14), and several C-shaped channels (29) are provided on the pump shaft (3). Both ends of the C-shaped channels (29) are connected to the channel (14).

6. A horizontal permanent magnet cooling shielded pump according to claim 4, characterized in that, A support frame (42) is provided between the rear bearing (9) and the rear shield (24). The support frame (42), the exhaust bolt (15) and the rear cover (16) form a cavity (43). A heat dissipation mechanism (44) is detachably connected to the outer wall of the exhaust bolt (15).

7. A horizontal permanent magnet cooling shielded pump according to claim 6, characterized in that, The heat dissipation mechanism (44) includes an annular block (45) detachably connected to the outer wall of the exhaust bolt (15). A plurality of fan blades (46) are uniformly fixed on the outer wall of the annular block (45). The fan blades (46) include a first skeleton layer (47) and a second skeleton layer (48) fixed on the annular block (45). A graphite soft felt layer (49) is fixed between the first skeleton layer (47) and the second skeleton layer (48).

8. A horizontal permanent magnet cooling shielded pump according to claim 6, characterized in that, The support frame (42) has a socket (50) that matches the outer wall surface of the exhaust bolt (15).

9. A horizontal permanent magnet cooling shielded pump according to claim 5, characterized in that, The C-shaped channel (29) is provided with an inlet (51) and an outlet (52). A movable cover plate (53) is provided at the outlet (52). A spring (54) is fixed on the bottom surface of the movable cover plate (53). The spring (54) extends into the C-shaped channel (29). The end of the spring (54) extending into the C-shaped channel (29) is fixed on a grid plate (55). The grid plate (55) is fixed on the inner wall of the C-shaped channel (29).

10. A horizontal permanent magnet cooling shielded pump according to claim 9, characterized in that, Two intersecting arc-shaped plates (56) are fixed on the top surface of the movable cover plate (53).

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