Gas-liquid mixing circulation system

Abstract

The utility model relates to the technical field of gas-liquid mixing, in particular to a gas-liquid mixing circulating system which comprises a reactor tank body, and an exhaust port and a gas inlet are formed in the reactor tank body; an inlet and an outlet are formed in the circulating device; one end of the exhaust pipe is connected with the exhaust port, and the other end is connected with the inlet; one end of the air inlet pipe is connected with the outlet and the other end is connected with the air inlet; the circulating device comprises a cylinder body, an inlet and an outlet which are positioned at two ends of the cylinder body, and a piston which slides in the cylinder body; the first magnetic piece is connected with the piston; the movable part slides in the cylinder body; the second magnetic piece is connected with the movable piece; the first magnetic piece and the second magnetic piece are attracted to each other, so that the movable piece drives the piston to move synchronously, and gas entering from the inlet is conveyed to the outlet. Gas in the reactor tank body enters the inlet of the cylinder body through the exhaust pipe, the movable part drives the piston to move, and the gas is conveyed from the inlet of the cylinder body to the outlet of the cylinder body and is fed into the reactor tank body through the gas inlet pipe to realize circulation.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating pumps, in particular to a gas-liquid mixed circulating system. Background Art

[0002] In the fields of chemistry, pharmacy, materials science, and chemical engineering, gas-liquid mixing in closed pressure vessels is generally achieved by high-speed stirring.

[0003] However, the vortex formed by stirring at a higher speed only increases the contact surface between gas and liquid within a certain range, and because the stirring mechanism needs to be arranged in a closed pressure vessel, the structure is relatively complex and the assembly cost is also high. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to solve the technical problems in the prior art, the utility model provides a gas-liquid mixing circulation system, which economically realizes the circulation of a large amount of gas in a reaction system under a certain pressure, greatly increasing the gas-liquid mixing effect.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a gas-liquid mixed circulation system, including a reactor tank body, the reactor tank body is provided with an exhaust port and an air inlet; a circulation device, the circulation device is provided with an inlet and an outlet; an exhaust pipe, one end of the exhaust pipe is connected to the exhaust port, and the other end is connected to the inlet; an air inlet pipe, one end of the air inlet pipe is connected to the outlet, and the other end is connected to the air inlet; the circulation device includes a cylinder body, the inlet and the outlet are located at the two ends of the cylinder body, and a piston, the piston slides in the cylinder body and is located between the inlet and the outlet; a first magnetic part, the first magnetic part is connected to the piston; a movable part, the movable part is arranged outside the cylinder body and can slide relative to the cylinder body; a second magnetic part, the second magnetic part is connected to the movable part; the first magnetic part and the second magnetic part are attracted to each other, so that the movable part drives the piston to move synchronously to transport the gas entering from the inlet to the outlet.

[0006] In the gas-liquid mixing circulation system of the utility model, the gas in the top of the reactor tank body enters the inlet of the cylinder body through the exhaust pipe, and then the movable part drives the piston to move, and the gas is transported from the inlet of the cylinder body to the outlet of the cylinder body, and then sent into the reactor tank body through the air intake pipe to realize circulation. At the same time, the circulation can be realized by cooperating with the first magnetic part, the second magnetic part and the piston. Compared with the traditional circulation pump, the cost is greatly reduced, and the cylinder body structure is simple, and the processing and assembly are relatively simple, which further reduces the cost.

[0007] Furthermore, the air inlet is lower than the liquid level in the reactor tank.

[0008] Furthermore, a first check piece is provided at the inlet of the cylinder body, a second check piece is provided at the outlet of the cylinder body, a connecting channel is penetrated through the piston, and a third check piece is provided at one end of the piston facing the outlet; when the piston moves toward the outlet, the inlet and the outlet are both opened, and the third check piece blocks one end of the connecting channel facing the outlet; when the piston moves toward the inlet, the first check piece blocks the inlet, the second check piece blocks the outlet, and the end of the connecting channel facing the outlet is opened.

[0009] Furthermore, the first check member includes a first check block and a check ball. The first check block is connected to the inner wall of the inlet. A first check channel connected to the inlet is penetrated by the first check block. The first check block also includes an accommodating cavity for accommodating the check ball. The check ball is located in the accommodating cavity. When the piston moves toward the inlet, the check ball blocks the part of the connecting channel connected to the inlet.

[0010] Furthermore, the first check member includes a second check block and a first check plate, the second check block is connected to the inner wall of the inlet, the second check block is penetrated by a first connecting hole connected to the inlet, the first check plate is connected to a first limit pin, the first limit pin is inserted into the second check block, the projection of the first connecting hole along its own axial direction falls on the first check plate, when the piston moves toward the inlet, the first check plate conflicts with the second check block to block the first connecting hole.

[0011] Furthermore, the first check member includes a third check block and a second check plate, the third check block is connected to the inner wall of the inlet, the third check block is penetrated by a second connecting hole connected to the inlet, a blocking cavity is also provided in the third check block, the second check plate is located in the blocking cavity, a second limit pin is connected to the second check plate, the second limit pin is inserted in the third check block, a compression spring is sleeved on the second limit pin to make the second check plate contact with the inner wall of the blocking cavity, when the second check plate contacts with the inner wall of the blocking cavity, the second check plate blocks the second connecting hole.

[0012] Furthermore, a driving cylinder is sleeved on the cylinder body, a medium channel is formed between the driving cylinder and the cylinder body, the movable part is arranged in the medium channel, a medium inlet and a medium outlet are provided on the medium channel, and the medium inlet and the medium outlet are both connected to a driving source to drive the movable part to reciprocate.

[0013] Furthermore, a guide rod is connected to the outside of the cylinder body along the axial direction of the cylinder body, a slider is connected to the movable part, the slider slides on the guide rod, a driving part is connected to the cylinder body, and the movable end of the driving part is connected to the movable part to drive the movable part to reciprocate along the guide rod.

[0014] Furthermore, a sealing ring is provided on the outer periphery of the piston.

[0015] Furthermore, the first magnetic component includes a first magnetic ring, and the second magnetic component includes a second magnetic ring, and the second magnetic ring is coaxially sleeved outside the first magnetic ring; the first magnetic ring has a first N pole and a first S pole, and the second magnetic ring has a second N pole and a second S pole, and the first N pole and the second S pole are aligned along the radial direction of the first magnetic ring, and the first S pole and the second N pole are aligned along the radial direction of the first magnetic ring.

[0016] The beneficial effects of the utility model are:

[0017] 1. The gas at the top of the reactor tank enters the inlet of the cylinder through the exhaust pipe, and then the movable part drives the piston to move, transporting the gas from the inlet of the cylinder to the outlet of the cylinder, and then into the reactor tank through the intake pipe to achieve circulation. At the same time, the first magnetic part, the second magnetic part and the piston can be used to achieve circulation. Compared with the traditional circulation pump, the cost is greatly reduced, and the cylinder structure is simple, and the processing and assembly are relatively simple, which further reduces the cost;

[0018] 2. One end of the air inlet pipe extends into the liquid in the reactor tank, which can increase the disturbance of the liquid, enhance the gas-liquid mixing effect, and thus promote the reaction effect;

[0019] 3. When the piston moves toward the outlet, both the inlet and the outlet are opened, and the third check piece blocks the end of the connecting channel toward the outlet, so that the medium in the cylinder body is pushed toward the outlet by the piston, and at the same time, the medium continues to enter between the inlet and the piston. When the piston moves toward the inlet, the first check piece blocks the inlet, the second check piece blocks the outlet, and the end of the piston connecting channel toward the outlet is opened, so that the medium between the piston and the inlet passes through the connecting channel to reach between the piston and the outlet, and this cycle is repeated to realize the circulation and pushing of the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a schematic structural diagram of the overall gas-liquid mixed circulation system in the utility model.

[0022] Figure 2 It is a schematic diagram of a circulation device in the utility model.

[0023] Figure 3 It is a schematic diagram of the cutaway structure of the first check block and the check ball in the utility model.

[0024] Figure 4 It is a schematic diagram of the cutaway structure of the second check block and the first check plate in the utility model.

[0025] Figure 5 It is a schematic diagram of the top view structure of the first connecting hole in the utility model.

[0026] Figure 6 It is a schematic diagram of the cutaway structure of the third check block and the second check plate in the utility model.

[0027] Figure 7 It is a schematic diagram of the structure of the fourth check block, locking screw and valve plate in the present invention.

[0028] Figure 8 It is a structural schematic diagram embodying the guide rod and the sliding block in the utility model.

[0029] In the figure: 1, cylinder body; 11, inlet; 12, outlet; 13, first check piece; 131, first check block; 1311, check channel; 1312, accommodating chamber; 132, check ball; 133, second check block; 1331, first connecting hole; 1332, first limit pin; 134, first check plate; 135, third check block; 1351, second connecting hole; 1352, blocking chamber; 1353, compression spring; 1354, second limit pin; 136, second check plate; 137, fourth check block; 1371 , locking screw; 1372, valve plate; 1373, third connecting hole; 14, second check piece; 15, drive cylinder; 151, medium channel; 152, medium inlet; 153, medium outlet; 16, guide rod; 2, piston; 21, first magnetic ring; 211, first N pole; 212, first S pole; 22, third check piece; 3, movable part; 31, second magnetic ring; 311, second N pole; 312, second S pole; 32, slider; 4, reactor tank; 41, exhaust pipe; 42, air inlet pipe; 5, circulation device. DETAILED DESCRIPTION

[0030] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0031] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The utility model discloses a gas-liquid mixed circulation system.

[0033] Reference Figures 1 to 8 A gas-liquid mixed circulation system includes a reactor tank body 4 and a circulation device 5. The reactor tank body 4 is provided with an exhaust port and an air inlet. The circulation device 5 includes a cylinder body 1 and a piston 2. The cylinder body 1 is provided with an inlet 11 and an outlet 12. The piston 2 slides in the cylinder body 1 and is located between the inlet 11 and the outlet 12. An exhaust pipe 41 and an air inlet pipe 42 are provided between the reactor tank body 4 and the circulation device 5. One end of the exhaust pipe 41 is connected to the exhaust port, and the other end is connected to the inlet 11. One end of the air inlet pipe 42 is connected to the outlet 12, and the other end is connected to the air inlet.

[0034] Specifically, a first magnetic member is connected inside the piston 2. A movable member 3 slides outside the cylinder body 1, and the movable member 3 is connected to a second magnetic member. The first magnetic member and the second magnetic member are attracted to each other, so that the movable member 3 and the piston 2 can move synchronously without being connected, thereby solving the problem of lack of drive in a closed environment.

[0035] One end of the air inlet pipe 42 away from the outlet 12 extends into the reactor tank body 4, and the portion of the air inlet pipe 42 located in the reactor tank body 4 is lower than the liquid level in the reactor tank body 4. One end of the air inlet pipe 42 extends into the liquid in the reactor tank body 4, which can increase the disturbance of the liquid and thus promote the reaction effect.

[0036] Furthermore, the cylinder body 1 can be of a straight type or a curved type. When the cylinder body 1 is of a curved type, it can be in an arc shape, a wavy shape, or other curved shapes.

[0037] Specifically, the inlet 11 of the cylinder body 1 is provided with a first check piece 13, the outlet 12 of the cylinder body 1 is provided with a second check piece 14, a connecting passage is penetrated by the piston 2, and a third check piece 22 is provided at the end of the piston 2 facing the outlet 12; when the piston 2 moves toward the outlet 12, the inlet 11 and the outlet 12 are both opened, and the third check piece 22 blocks the end of the connecting passage facing the outlet 12; when the piston 2 moves toward the inlet 11, the first check piece 13 blocks the inlet 11, the second check piece 14 blocks the outlet 12, and the end of the connecting passage facing the outlet 12 is opened. When the piston 2 moves toward the outlet 12, the inlet 11 and the outlet 12 are both opened, and the third check piece 22 blocks the end of the connecting channel toward the outlet 12, so that the medium in the cylinder 1 is pushed toward the outlet 12 by the piston 2, and at the same time, the medium continues to enter between the inlet 11 and the piston 2. When the piston 2 moves toward the inlet 11, the first check piece 13 blocks the inlet 11, and the second check piece 14 blocks the outlet 12, while the end of the piston 2 connecting channel toward the outlet 12 is opened, so that the medium between the piston 2 and the inlet 11 passes through the connecting channel to reach between the piston 2 and the outlet 12, and this cycle is repeated to realize the circulation and pushing of the medium.

[0038] More specifically, the first check member 13 includes a first check block 131 and a check ball 132. The first check block 131 is connected to the inner wall of the inlet 11. The first check block 131 is penetrated by a first check channel 1311 connected to the inlet 11. The first check block 131 also includes an accommodating cavity 1312 for accommodating the check ball 132. The check ball 132 is located in the accommodating cavity 1312. When the piston 2 moves toward the inlet 11, the check ball 132 blocks the part of the connecting channel connected to the inlet 11.

[0039] The second check piece 14 and the third check piece 22 can adopt the same structure as the first check piece 13 , and can be obtained by the same logic, so they are not repeated here.

[0040] In another embodiment, the first check member 13 includes a second check block 133 and a first check plate 134. The second check block 133 is connected to the inner wall of the inlet 11. The second check block 133 is penetrated by a first connecting hole 1331 connected to the inlet 11. The first check plate 134 is connected to a first limit pin 1332. The first limit pin 1332 is inserted into the second check block 133. The projection of the first connecting hole 1331 along its own axial direction falls on the first check plate 134. When the piston 2 moves toward the inlet 11, the first check plate 134 conflicts with the second check block 133 to block the first connecting hole 1331.

[0041] In another embodiment, the first check member 13 includes a third check block 135 and a second check plate 136. The third check block 135 is connected to the inner wall of the inlet 11. The third check block 135 is penetrated by a second connecting hole 1351 connected to the inlet 11. A blocking cavity 1352 is also provided in the third check block 135. The second check plate 136 is located in the blocking cavity 1352. The second check plate 136 is connected to a second limit pin 1354. The second limit pin 1354 is inserted into the third check block 135. A compression spring 1353 is sleeved on the second limit pin 1354 to make the second check plate 136 contact with the inner wall of the blocking cavity 1352. When the second check plate 136 contacts with the inner wall of the blocking cavity 1352, the second check plate 136 blocks the second connecting hole 1351.

[0042] In another embodiment, the first check member 13 includes a fourth check block 137, a locking screw 1371 and a valve plate 1372. The fourth check block 137 is connected to the inner wall of the inlet 11. The fourth check block 137 is penetrated by a third connecting hole 1373 connected to the inlet 11. The valve plate 1372 is in conflict with the fourth check block 137 and blocks the third connecting hole 1373. The locking screw 1371 passes through the valve plate 1372 and is threadedly connected to the fourth check block 137.

[0043] Specifically, a drive cylinder 15 is sleeved on the cylinder body 1, a medium channel 151 is formed between the drive cylinder 15 and the cylinder body 1, the movable member 3 is arranged in the medium channel 151, a medium inlet 152 and a medium outlet 153 are arranged on the medium channel 151, and the medium inlet 152 and the medium outlet 153 are both connected to the driving source to drive the movable member 3 to move back and forth. The medium introduced into the medium channel 151 can be gas, hydraulic oil, etc.

[0044] In another embodiment, the outer side of the cylinder body 1 is connected to a guide rod 16 in the axial direction of the cylinder body 1, the movable member 3 is connected to a slider 32, the slider 32 slides on the guide rod 16, the cylinder body 1 is connected to a driving member, and the movable end of the driving member is connected to the movable member 3 to drive the movable member 3 to reciprocate along the guide rod 16. The driving member can be an electric cylinder, a pneumatic cylinder or a linear guide rail.

[0045] Specifically, a sealing ring is provided on the outer periphery of the piston 2. The first magnetic member includes a first magnetic ring 21, and the second magnetic member includes a second magnetic ring 31. The second magnetic ring 31 is coaxially sleeved outside the first magnetic ring 21; the first magnetic ring 21 has a first N pole 211 and a first S pole 212, and the second magnetic ring 31 has a second N pole 311 and a second S pole 312. The first N pole 211 and the second S pole 312 are arranged in a radial direction of the first magnetic ring 21, and the first S pole 212 and the second N pole 311 are arranged in a radial direction of the first magnetic ring 21. The first magnetic ring 21 and the second magnetic ring 31 are arranged in pairs. In this embodiment, the first magnetic ring 21 and the second magnetic ring 31 are each provided with two groups.

[0046] Working principle: The gas in the reactor tank body 4 enters the inlet 11 of the cylinder body 1 through the exhaust pipe 41, and then the movable part 3 drives the piston 2 to move, and the gas is transported from the inlet 11 of the cylinder body 1 to the outlet 12 of the cylinder body 1, and then sent into the reactor tank body 4 through the intake pipe 42 to realize circulation and reduce the pressure in the reactor tank body. At the same time, the circulation can be realized by the cooperation of the first magnetic part, the second magnetic part and the piston 2. Compared with the traditional circulation pump, the cost is greatly reduced, and the cylinder body 1 has a simple structure, and the processing and assembly are relatively simple, which further reduces the cost.

[0047] When the piston 2 moves toward the outlet 12, the inlet 11 and the outlet 12 are both opened, and the third check piece 22 blocks the end of the connecting channel toward the outlet 12, so that the medium in the cylinder 1 is pushed toward the outlet 12 by the piston 2, and at the same time, the medium continues to enter between the inlet 11 and the piston 2. When the piston 2 moves toward the inlet 11, the first check piece 13 blocks the inlet 11, and the second check piece 14 blocks the outlet 12, while the end of the piston 2 connecting channel toward the outlet 12 is opened, so that the medium between the piston 2 and the inlet 11 passes through the connecting channel to reach between the piston 2 and the outlet 12, and this cycle is repeated to realize the circulation and pushing of the medium.

[0048] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A gas-liquid mixed circulation system, characterized in that: include A reactor tank body (4), wherein the reactor tank body (4) is provided with an exhaust port and an air inlet; A circulation device (5), wherein the circulation device (5) is provided with an inlet (11) and an outlet (12); An exhaust pipe (41), one end of the exhaust pipe (41) is connected to the exhaust port, and the other end is connected to the inlet (11); An air intake pipe (42), one end of the air intake pipe (42) is connected to the outlet (12), and the other end is connected to the air inlet; The circulation device (5) comprises The cylinder body (1), the inlet (11) and the outlet (12) are located at two ends of the cylinder body (1), A piston (2), the piston (2) slides in the cylinder (1) and is located between the inlet (11) and the outlet (12); A first magnetic member, the first magnetic member being connected to the piston (2); A movable part (3), wherein the movable part (3) is arranged outside the cylinder body (1) and is capable of sliding relative to the cylinder body (1); a second magnetic member, the second magnetic member being connected to the movable member (3); The first magnetic member and the second magnetic member are attracted to each other, so that the movable member (3) drives the piston (2) to move synchronously, thereby conveying the gas entering from the inlet (11) to the outlet (12).

2. The gas-liquid mixed circulation system according to claim 1, characterized in that: The air inlet is lower than the liquid level in the reactor tank (4).

3. The gas-liquid mixed circulation system according to claim 1, characterized in that: The inlet (11) of the cylinder body (1) is provided with a first check piece (13), the outlet (12) of the cylinder body (1) is provided with a second check piece (14), a communication channel is provided through the piston (2), and a third check piece (22) is provided at one end of the piston (2) facing the outlet (12); When the piston (2) moves toward the outlet (12), the inlet (11) and the outlet (12) are both opened, and the third check member (22) blocks one end of the connecting channel toward the outlet (12); When the piston (2) moves toward the inlet (11), the first check member (13) blocks the inlet (11), the second check member (14) blocks the outlet (12), and the connecting channel opens toward one end of the outlet (12).

4. The gas-liquid mixed circulation system according to claim 3, characterized in that: The first check member (13) comprises a first check block (131) and a check ball (132); the first check block (131) is connected to the inner wall of the inlet (11); a first check channel (1311) connected to the inlet (11) is provided through the first check block (131); the first check block (131) also comprises a receiving chamber (1312) for receiving the check ball (132); the check ball (132) is located in the receiving chamber (1312); when the piston (2) moves toward the inlet (11), the check ball (132) blocks the portion of the connecting channel connected to the inlet (11).

5. The gas-liquid mixed circulation system according to claim 3, characterized in that: The first check member (13) includes a second check block (133) and a first check plate (134), the second check block (133) being connected to the inner wall of the inlet (11), the second check block (133) being provided with a first connecting hole (1331) connected to the inlet (11), the first check plate (134) being connected with a first limiting pin (1332), the first limiting pin (1332) being inserted into the second check block (133), the projection of the first connecting hole (1331) along its own axial direction falling on the first check plate (134), when the piston (2) moves toward the inlet (11), the first check plate (134) abuts against the second check block (133) to block the first connecting hole (1331).

6. The gas-liquid mixed circulation system according to claim 3, characterized in that: The first check member (13) comprises a third check block (135) and a second check plate (136); the third check block (135) is connected to the inner wall of the inlet (11); the third check block (135) is provided with a second connecting hole (1351) connected to the inlet (11); the third check block (135) is further provided with a blocking cavity (1352); the second check plate (136) is located in the blocking cavity (1352); the second check plate A second limit pin (1354) is connected to (136), and the second limit pin (1354) is inserted into the third check block (135). A compression spring (1353) is sleeved on the second limit pin (1354) to make the second check plate (136) contact the inner wall of the blocking cavity (1352). When the second check plate (136) contacts the inner wall of the blocking cavity (1352), the second check plate (136) blocks the second connecting hole (1351).

7. The gas-liquid mixed circulation system according to claim 1, characterized in that: A drive cylinder (15) is sleeved on the cylinder body (1), a medium channel (151) is formed between the drive cylinder (15) and the cylinder body (1), the movable member (3) is arranged in the medium channel (151), a medium inlet (152) and a medium outlet (153) are provided on the medium channel (151), and the medium inlet (152) and the medium outlet (153) are both connected to a drive source to drive the movable member (3) to reciprocate.

8. The gas-liquid mixed circulation system according to claim 1, characterized in that: The cylinder body (1) is connected to a guide rod (16) along the axial direction of the cylinder body (1) on the outside, the movable part (3) is connected to a slider (32), the slider (32) slides on the guide rod (16), the cylinder body (1) is connected to a driving part, and the movable end of the driving part is connected to the movable part (3) to drive the movable part (3) to move back and forth along the guide rod (16).

9. The gas-liquid mixed circulation system according to claim 1, characterized in that: A sealing ring is provided on the outer periphery of the piston (2).

10. The gas-liquid mixed circulation system according to claim 1, characterized in that: The first magnetic component comprises a first magnetic ring (21), and the second magnetic component comprises a second magnetic ring (31), wherein the second magnetic ring (31) is coaxially sleeved outside the first magnetic ring (21); The first magnetic ring (21) has a first N pole (211) and a first S pole (212), the second magnetic ring (31) has a second N pole (311) and a second S pole (312), the first N pole (211) and the second S pole (312) are arranged in an aligned radial direction of the first magnetic ring (21), and the first S pole (212) and the second N pole (311) are arranged in an aligned radial direction of the first magnetic ring (21).

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