Cooling structure of magnetic drive pump

Abstract

The utility model provides a magnetic drive pump cooling structure which comprises a pump body, a centrifugal cavity and a coupling cavity are arranged in the pump body, the pump body is provided with a liquid inlet and a liquid outlet, and the centrifugal cavity enables the liquid inlet and the liquid outlet to be communicated. And one end of the impeller shaft, which is arranged in the centrifugal cavity, is connected with an impeller. The end, extending into the coupling cavity, of the impeller shaft is connected with a magnetic coupling device. The end, communicated with the centrifugal cavity, of the drainage cavity is arranged close to the liquid outlet, and a through hole is formed in the impeller shaft along the axis. Fluid enters the coupling cavity from the through hole and then enters the centrifugal cavity from the drainage cavity to be discharged. The cooling flow channel is arranged, heat in the coupling cavity is discharged, heat of the isolation sleeve in the coupling cavity is reduced, cooling efficiency is improved, the demagnetization phenomenon is avoided, and the service life of the magnetic force driving pump is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of magnetic drive pump, concretely relates to a cooling structure of magnetic drive pump. BACKGROUND

[0002] The magnetic drive pump is widely used in the fields of chemical industry, petroleum, pharmacy and the like as a fluid conveying equipment without leakage and low maintenance. One of the core components is the isolation sleeve which is installed between the inner rotor and the outer rotor, plays a key role in isolating medium sealing and realizing magnetic rotation. In the running process, high temperature is generated due to the influence of eddy current heat effect, magnetic hysteresis loss and the like, and the high temperature of the isolation sleeve can cause the working temperature of the permanent magnet to exceed the Curie temperature, so that the irreversible demagnetization phenomenon of the permanent magnet occurs, thereby reducing the magnetic force transmission efficiency. The existing magnetic drive pump can guide the fluid in the impeller area to the isolation sleeve area, and the fluid flow of this part is limited, which is insufficient to offset the heat load under high power operation, and the heat cannot be quickly discharged, so the heat dissipation demand cannot be met.

[0003] Therefore, the above problems need to be solved. UTILITY MODEL CONTENT

[0004] The utility model discloses a cooling structure of magnetic drive pump, can guide the fluid to the coupling cavity, and the heat is quickly discharged, improves the heat dissipation efficiency, reduces the temperature of the isolation sleeve, avoids the demagnetization phenomenon, and improves the service life of the magnetic drive pump.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the utility model provides a magnetic drive pump cooling structure, including the pump body, the centrifugal chamber and the coupling chamber are equipped in the pump body, the pump body is equipped with the liquid inlet and the liquid outlet, the centrifugal chamber is connected with the liquid inlet and the liquid outlet, the impeller shaft is movably connected in the centrifugal chamber, the impeller shaft is placed in the centrifugal chamber one end and is connected with the impeller, the impeller shaft is connected with the magnetic coupling device in the coupling chamber one end that stretches into, the centrifugal chamber and the coupling chamber are communicated through the drainage chamber, the drainage chamber and the centrifugal chamber communication end are close to the liquid outlet and are established, the impeller shaft is equipped with the through hole along the axis, fluid enters the coupling chamber from the through hole, and then enters the centrifugal chamber from the drainage chamber and is discharged, the utility model discloses at least part of fluid in the centrifugal chamber, the magnetic coupling device and motor drive connection, the motor drives the impeller shaft to rotate through the magnetic coupling device, and then the impeller rotates, and the fluid in the centrifugal chamber is discharged, and the fluid is sucked into the centrifugal chamber from the liquid inlet due to the negative pressure formed in the centrifugal chamber by discharging the fluid, and is pumped out from the liquid outlet, so that fluid conveying is realized, in the process that fluid enters from the liquid inlet and is discharged from the liquid outlet, the flow channel of fluid flow is formed, the partial fluid will enter the coupling chamber from the through hole due to the suction force of the liquid inlet and the inertial force generated by fluid flow, when the fluid in the coupling chamber reaches a certain degree, the fluid enters the centrifugal chamber from the drainage chamber, and the fluid discharged from the coupling chamber is discharged under the driving of the fluid at the liquid outlet due to the drainage chamber being close to the liquid outlet, so that the heat in the coupling chamber is discharged, the stable cooling flow channel is formed, the heat of the isolation sleeve in the coupling chamber is reduced, the cooling efficiency is improved, the demagnetization phenomenon is avoided, and the service life of the magnetic drive pump is improved.

[0006] Further, in the above-mentioned magnetic drive pump cooling structure, the through hole is connected with a spiral blade, the spiral blade is arranged in a spiral along the inner wall of the through hole, and the rotation direction of the spiral blade is correspondingly arranged with the rotation direction of the impeller. By arranging the spiral blade in the through hole, when the impeller shaft rotates to drive the spiral blade, the fluid in the through hole is discharged into the coupling chamber, the flow rate of the fluid entering the coupling chamber is improved, and as the power of the magnetic drive pump increases, the rotation speed of the impeller shaft increases, the heat generated by the eddy current heat effect and the magnetic hysteresis loss is more, the rotation speed of the spiral blade driven by the impeller shaft increases, the flow rate of the fluid in the through hole is improved, the heat exchange efficiency is improved, and the heat dissipation demand is met.

[0007] Further, in the above-mentioned magnetic drive pump cooling structure, the impeller includes a front disc cover and a rear disc cover, a guide vane is arranged between the front disc cover and the rear disc cover, the front disc cover is arranged close to the liquid inlet, and the front disc cover is provided with a center hole. The fluid enters between the front disc cover and the rear disc cover from the center hole and is pressurized by the guide vane. By arranging the guide vane between the front disc cover and the rear disc cover, the fluid is discharged from the middle of the front disc cover and the rear disc cover, a stable flow path is formed, the vortex and turbulence are reduced, the influence of the fluid in the centrifugal chamber on the drainage chamber is reduced, and as the fluid is discharged from the liquid outlet, the suction force of the fluid in the drainage chamber is generated, and the cooling efficiency is improved.

[0008] Further, the magnetic drive pump cooling structure, the guide vane comprises a leading edge and a trailing edge, the leading edge is arranged parallel to the front disc cover, and the trailing edge is arranged perpendicular to the front disc cover. The leading edge is integrally arranged in an arc transition to the trailing edge. The leading edge is arranged along the central hole array. The trailing edge is arranged perpendicular to the front disc cover, which can accurately guide the fluid to flow in the radial direction or the axial direction, avoid energy loss caused by turbulence, improve the fluid dynamics performance of the pump, and improve the overall efficiency of the pump.

[0009] Further, the magnetic drive pump cooling structure, a convex ring is arranged along the central hole, the convex ring is arranged close to the liquid outlet, the convex ring and the liquid outlet are coaxially arranged, and the leading edge is connected to the inner side wall of the convex ring. The leading edge can guide the fluid to enter between the front disc cover and the rear disc cover, and the connection of the leading edge to the convex ring can optimize the blade curve inlet and improve the pumping efficiency.

[0010] Further, the magnetic drive pump cooling structure, the magnetic coupling device comprises an inner magnetic rotor connected to the impeller shaft and an isolation sleeve connected to the pump body. The isolation sleeve is arranged outside the inner magnetic rotor, the pump body is connected to the end cover on the side away from the liquid inlet, the end cover is connected with a transmission shaft, the transmission shaft is arranged inside the end cover and connected at one end to an outer magnetic rotor, the outer magnetic rotor is arranged outside the isolation sleeve, the transmission shaft is in transmission connection with the motor shaft, the transmission shaft drives the outer magnetic rotor to rotate, and the outer magnetic rotor drives the inner magnetic rotor to rotate by magnetic force.

[0011] Further, the magnetic drive pump cooling structure, the end cover is integrally provided with heat dissipation fins, and the heat dissipation fins are arranged in an array along the outer side wall of the end cover. The design of the heat dissipation fins can increase the heat dissipation area, improve the heat dissipation efficiency, and improve the stability of the equipment.

[0012] Further, the magnetic drive pump cooling structure, the flow guide cavity is provided with two or more, and the flow guide cavity is arranged in a horn type. The horn mouth of the flow guide cavity is arranged close to the coupling cavity.

[0013] Further, the magnetic drive pump cooling structure, the pump body is provided in a vortex type.

[0014] The above technical scheme can be seen that the magnetic drive pump cooling structure of the utility model has the following beneficial effects: the utility model discloses a magnetic drive pump cooling structure, which sets up a cooling flow channel to discharge the heat in the coupling cavity, reduces the heat of the isolation sleeve in the coupling cavity, improves the cooling efficiency, avoids demagnetization, and prolongs the service life of the magnetic drive pump. The spiral blades are arranged to discharge the fluid in the through hole into the coupling cavity, do work on the fluid, increase the flow rate of the fluid entering the coupling cavity, and improve the heat exchange efficiency. The guide vane is arranged between the front disc cover and the rear disc cover to guide the fluid to discharge from the middle of the front disc cover and the rear disc cover, form a stable flow path, reduce vortex and turbulence, reduce the influence of the fluid in the centrifugal cavity on the flow guide cavity, and generate suction on the fluid in the flow guide cavity when the fluid is discharged from the liquid outlet, thereby improving the cooling efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a sectional view of the magnetic drive pump cooling structure of the utility model;

[0016] Figure 2 is a structural schematic view of the impeller;

[0017] Figure 3 is a structural schematic view of the impeller;

[0018] Figure 4 is Figure 1 a partial enlarged view.

[0019] In the figure: 1, pump body, 11, centrifugal cavity, 12, coupling cavity, 13, liquid inlet, 14, liquid outlet, 15, impeller shaft, 151, through hole, 152, spiral blade, 16, impeller, 161, front disc cover, 1611, center hole, 1612, convex ring, 162, rear disc cover, 163, guide vane, 1631, leading edge, 1632, trailing edge, 17, magnetic coupling device, 171, inner magnetic rotor, 172, isolation sleeve, 173, outer magnetic rotor, 18, drainage cavity, 19, end cover, 191, transmission shaft, 192, heat dissipation fin. DETAILED DESCRIPTION

[0020] Example 1

[0021] As Figure 1 shown in a kind of magnetic drive pump cooling structure, including pump body 1, pump body 1 is equipped with centrifugal cavity 11 and coupling cavity 12, pump body 1 is equipped with liquid inlet 13 and liquid outlet 14, centrifugal cavity 11 is connected with liquid inlet 13 and liquid outlet 14.The centrifugal cavity 11 is movably connected with impeller shaft 15 in shaft, and the impeller shaft 15 is placed in the centrifugal cavity 11 one end and is connected with impeller 16.Impeller shaft 15 is connected with magnetic coupling device 17 in one end that extends into coupling cavity 12.Centrifugal cavity 11 and coupling cavity 12 are communicated by drainage cavity 18, and the communication end of drainage cavity 18 and centrifugal cavity 11 is close to liquid outlet 14 setting, and impeller shaft 15 is provided with through hole 151 along axis.The fluid enters coupling cavity 12 from through hole 151, then from drainage cavity 18 into centrifugal cavity 11 and is discharged.Spiral blade 152 is connected with through hole 151, and spiral blade 152 is spirally extended and is set along the inner wall of through hole 151, and the rotating direction of spiral blade 152 and the rotating direction of impeller 16 are correspondingly set.

[0022] In this invention, the centrifuge chamber 11 contains at least a portion of fluid. A magnetic coupling device 17 is connected to a motor drive. The motor drives the impeller shaft 15 to rotate via the magnetic coupling device 17, which in turn rotates the impeller 16, discharging the fluid from the centrifuge chamber 11. The discharge of fluid creates a negative pressure within the centrifuge chamber 11, drawing the fluid in through the inlet 13 and pumping it out through the outlet 14, thus achieving fluid transport. During the process of fluid entering through the inlet 13 and exiting through the outlet 14, a flow channel is formed. The fluid is subjected to suction at the inlet 13 and inertial force generated by the fluid flow, causing some fluid to enter the coupling chamber 12 through the through-hole 151. Simultaneously, the spiral blades 152 installed within the through-hole 151, driven by the impeller shaft 15, discharge the fluid from the through-hole 151 into the coupling chamber 12, increasing the fluid velocity entering the coupling chamber 12. When the fluid in the coupling cavity 12 reaches a certain level, the fluid enters the centrifuge cavity 11 from the drainage cavity 18. Because the drainage cavity 18 is located close to the drain port 14, the fluid discharged from the coupling cavity 12 is discharged under the action of the fluid in the drain port 14, which discharges the heat in the coupling cavity 12, reduces the heat of the isolation sleeve in the coupling cavity 12, and cools the isolation sleeve.

[0023] A helical blade 152 is installed inside the through hole 151. When the impeller shaft 15 rotates, it drives the helical blade 152, thereby discharging the fluid in the through hole 151 into the coupling cavity 12, doing work on the fluid, increasing the fluid velocity entering the coupling cavity 12. As the power of the magnetically driven pump increases, the speed of the impeller shaft 15 also increases, resulting in more heat generated by eddy current heating effect and hysteresis loss. The impeller shaft 15 drives the helical blade 152 to rotate faster, increasing the fluid velocity in the through hole 151, improving heat exchange efficiency, and meeting heat dissipation requirements.

[0024] like Figure 2 The magnetically driven pump cooling structure shown includes an impeller 16 comprising a front cover 161 and a rear cover 162. A guide vane 163 is disposed between the front cover 161 and the rear cover 162. The front cover 161 is located near the inlet 13 and has a central hole 1611. Fluid enters between the front cover 161 and the rear cover 162 through the central hole 1611 and is pressurized by the guide vane 163. By placing the guide vane 163 between the front cover 161 and the rear cover 162, the fluid is guided to exit from the middle of the front cover 161 and the rear cover 162, forming a stable flow path, reducing eddies and turbulence, reducing the influence of the fluid in the centrifugal chamber on the drainage chamber 18, and generating suction on the fluid in the drainage chamber 18 as the fluid exits from the outlet, thereby improving cooling efficiency.

[0025] like Figure 3The magnetically driven pump cooling structure shown includes a guide vane 163 comprising a leading edge 1631 and a trailing edge 1632. The leading edge 1631 is parallel to the front cover 161, and the trailing edge 1632 is perpendicular to the front cover 161. The leading edge 1631 and the trailing edge 1632 are integrally formed with an arc transition. The leading edges 1631 are arranged in an array along the central hole 1611.

[0026] In this embodiment, a convex ring 1612 is provided along the central hole 1611. The convex ring 1612 is located close to the drain port 14. The convex ring 1612 and the drain port 14 are coaxially and correspondingly provided. The leading edge 1631 is connected to the inner sidewall of the convex ring 1612.

[0027] like Figure 3 The magnetically driven pump cooling structure shown includes a magnetic coupling device 17 comprising an inner magnetic rotor 171 connected to an impeller shaft 15 and an isolation sleeve 172 connected to the pump body 1. The isolation sleeve 172 is located outside the inner magnetic rotor 171. The pump body 1, on the side away from the inlet 13, is connected to an end cover 19. A drive shaft 191 is axially connected to the end cover 19. The drive shaft 191 is located inside the end cover 19, with one end connected to an outer magnetic rotor 173. The outer magnetic rotor 173 is located outside the isolation sleeve 172. The drive shaft 191 is connected to a motor shaft, and the drive shaft 191 drives the outer magnetic rotor 173 to rotate. The outer magnetic rotor 173 magnetically drives the inner magnetic rotor 171 to rotate. The end cover 19 is integrally provided with heat dissipation fins 192, which are arranged in an array along the outer side wall of the end cover 19.

[0028] In this embodiment, there are two or more drainage cavities 18, which are arranged in a funnel shape, with the funnel opening of the drainage cavity 18 located close to the coupling cavity 12.

[0029] In this embodiment, the pump body 1 is designed as a vortex.

[0030] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A magnetic drive pump cooling structure, characterized by: The utility model provides a pump, including pump body (1), centrifugal chamber (11) and coupling chamber (12) are equipped in the pump body (1), the pump body (1) is equipped with liquid inlet (13) and liquid outlet (14), and the centrifugal chamber (11) is communicated with liquid inlet (13) and liquid outlet (14);The impeller shaft (15) is movably connected in the centrifugal chamber (11), and the impeller shaft (15) is arranged in the centrifugal chamber (11) one end and is connected with impeller (16);The impeller shaft (15) is inserted into the coupling chamber (12) one end and is connected with magnetic coupling device (17);The centrifugal chamber (11) and coupling chamber (12) are communicated by drainage chamber (18), and the drainage chamber (18) and centrifugal chamber (11) communicated end are close to liquid outlet (14) setting, the impeller shaft (15) is provided with through -hole (151) along the axis;Fluid enters the coupling chamber (12) from the through -hole (151), and then from drainage chamber (18) into centrifugal chamber (11) and is discharged.

2. The magnetic drive pump cooling structure of claim 1, wherein: The through -hole (151) is connected with spiral blade (152), the spiral blade (152) is arranged along the helical extension of the inner wall of through -hole (151), and the spiral blade (152) is arranged in the corresponding direction of rotation with the direction of rotation of impeller (16).

3. The magnetic drive pump cooling structure of claim 1, wherein: The impeller (16) includes front disc cover (161) and rear disc cover (162), the front disc cover (161) and rear disc cover (162) are provided with guide vane (163) between them, the front disc cover (161) is close to liquid inlet (13) setting, and the front disc cover (161) is provided with center hole (1611);Fluid enters between the front disc cover (161) and rear disc cover (162) from center hole (1611) and is made work by guide vane (163) and is pressurized.

4. The magnetic drive pump cooling structure of claim 3, wherein: The guide vane (163) includes leading edge (1631) and trailing edge (1632), the leading edge (1631) is arranged parallel to the front disc cover (161), and the trailing edge (1632) is arranged perpendicular to the front disc cover (161);The leading edge (1631) is integrally arranged in arc transition to the trailing edge (1632);The leading edge (1631) is arranged in array along center hole (1611).

5. The magnetic drive pump cooling structure of claim 4, wherein: The convex ring (1612) is arranged along the center hole (1611), the convex ring (1612) is close to liquid outlet (14) setting, the convex ring (1612) and liquid outlet (14) are coaxially arranged correspondingly, and the leading edge (1631) is connected to the inner side wall of the convex ring (1612).

6. The magnetic drive pump cooling structure of claim 1, wherein: The magnetic coupling device (17) comprises an inner magnetic rotor (171) connected to the impeller shaft (15), and an isolating sleeve (172) connected to the pump body (1); the isolating sleeve (172) is arranged outside the inner magnetic rotor (171), the pump body (1) is connected to an end cover (19) on the side away from the liquid inlet (13), the end cover (19) is axially connected with a transmission shaft (191), the transmission shaft (191) is provided with an outer magnetic rotor (173) at one end inside the end cover (19), the outer magnetic rotor (173) is arranged outside the isolating sleeve (172), the transmission shaft (191) is in transmission connection with the motor shaft, the transmission shaft (191) drives the outer magnetic rotor (173) to rotate, and the outer magnetic rotor (173) drives the inner magnetic rotor (171) to rotate by magnetic force.

7. The magnetic drive pump cooling structure of claim 6, wherein: The end cover (19) is integrally provided with heat dissipation fins (192), and the heat dissipation fins (192) are arranged in an array along the outer side wall of the end cover (19).

8. The magnetic drive pump cooling structure of claim 7, wherein: The drainage cavity (18) is provided with two or more, the drainage cavity (18) is arranged in a horn type, and the horn mouth of the drainage cavity (18) is arranged close to the coupling cavity (12).

9. The magnetic drive pump cooling structure of claim 1, wherein: The pump body (1) is arranged in a vortex type.

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