Magnetic sealing device with high sealing performance

Abstract

The utility model relates to a magnetic sealing device with high sealing performance, which is applied to the technical field of mechanical engineering sealing and realizes that under normal conditions, the temperature of a rotating shaft can be maintained within a normal range, at the moment, an elastic diaphragm cannot be contacted with a control switch even if the elastic diaphragm slightly expands and bulges due to air pressure, and when a magnetic sealing structure goes wrong, the elastic diaphragm cannot be contacted with the control switch. When the temperature of the rotating shaft rises, the air pressure on the inner side of the inner-layer cover is increased, the elastic diaphragm expands and protrudes outwards due to the increase of the air pressure, when the temperature of the rotating shaft is too high, the elastic diaphragm expands to a large degree, and when the elastic diaphragm rotates to the control switch along with the rotating shaft, the control switch is extruded and triggered, so that the alarm is triggered to remind a worker to go to overhaul; and meanwhile, the electromagnetic block is electrified through the control switch, so that the electromagnetic block is magnetically attracted through the magnetic sheet so as to be separated from the elastic diaphragm, and the elastic diaphragm is prevented from being in contact with the control switch during continuous rotation of the rotating shaft to cause abrasion to the elastic diaphragm.

Description

TECHNICAL FIELD

[0001] The utility model relates to a high sealing magnetic sealing device, in particular to a high sealing magnetic sealing device applied to mechanical engineering sealing technical field. BACKGROUND

[0002] Magnetic liquid seal is that under the action of magnetic field, magnetic liquid forms liquid O ring at sealing gap, prevents fluid from passing through, thereby realizing the leakage of sealing channel. Because of low seepage and no solid contact friction of liquid seal, magnetic liquid seal has advantages of zero leakage and long service life.

[0003] The utility model discloses a magnetic force sealing device, the device includes the ring of motion and static ring of sleeve on the power shaft, is equipped with the bearing on the power shaft, and the static ring outside is equipped with the machine seal seat of pressing bearing, and the outer periphery of machine seal seat is equipped with the first sealing piece, and the inner periphery of machine seal seat for sleeve static ring is equipped with the second sealing groove, and the second sealing groove is installed with the second sealing piece, and static ring is installed on machine seal seat through the second sealing piece;The inner periphery of ring of motion for sleeve power shaft is equipped with the third sealing groove, and the third sealing groove is installed with the third sealing piece, and ring of motion is tightly attached on the power shaft through the third sealing piece;The outer periphery of ring of motion is equipped with the magnetic force cap of pressing ring of motion on static ring, and one end of magnetic force cap is in contact with the end of ring of motion, and the other end is opposite machine seal seat and has first gap, and one side of machine seal seat opposite magnetic force cap is equipped with the magnet of being attracted with magnetic force cap.

[0004] The utility model has the advantages of prolonging service life.

[0005] The magnetic seal structure used in the current stirring device is under normal circumstances by no solid contact friction, the temperature of the rotating shaft can be maintained within a normal range, but when the magnetic seal device has a problem, the temperature of the rotating shaft will abnormally rise, which needs to be found out and handled in time, but the existing magnetic seal device cannot alarm when the temperature of the rotating shaft is too high, so that the staff cannot find out and handle in time. Utility model content

[0006] In view of the above prior art, the technical problem to be solved by the utility model is that under normal circumstances by no solid contact friction, the temperature of the rotating shaft can be maintained within a normal range, but when the magnetic seal device has a problem, the temperature of the rotating shaft will abnormally rise, which needs to be found out and handled in time, but the existing magnetic seal device cannot alarm when the temperature of the rotating shaft is too high, so that the staff cannot find out and handle in time.

[0007] In order to solve the above problems, the utility model provides a kind of high sealing magnetic sealing device, including stirring tank, rotatingly connected with the middle part of stirring tank top end pivot, magnetic sealing structure is connected between pivot and stirring tank, the surface of pivot is equipped with the inner cover located above magnetic sealing structure, the outer cover of inner cover is fixedly connected with the top end of magnetic sealing structure, gas hole is opened in the side wall of inner cover and passes through inner and outer cover, elastic diaphragm is fixedly connected in gas hole, electromagnetic block is fixedly connected with the inner wall of outer cover, one end of electromagnetic block close to inner cover is fixedly connected with compression spring, one end of compression spring close to inner cover is fixedly connected with connecting plate, and one end of connecting plate close to electromagnetic block is fixedly connected with the magnetic sheet that is mutually attracted with electromagnetic block, control switch is installed in one end of connecting plate close to inner cover, and electromagnetic block is electrically connected with control switch by power line, alarm is fixedly connected with control switch electrically connected on stirring tank.

[0008] In the above magnetic sealing device, in the case of pressure increase due to temperature rise in the inner cover, the elastic diaphragm expands, and it is in contact with the control switch, triggering the alarm to remind the staff to repair the magnetic sealing structure before failure, and the electromagnetic block and the magnetic sheet are magnetically attracted, and the control switch and the elastic diaphragm are separated immediately after contact, to avoid wear and tear.

[0009] As a further improvement of the present application, the control switch is located on the connecting plate and is designed in an inclined manner.

[0010] As a further improvement of the present application, the outer cover is provided with a spray head, the spray head is threadedly connected with a delivery pipe at the top end, a liquid nitrogen tank filled with liquid nitrogen is placed on the side of the stirring tank, and the liquid nitrogen tank is threadedly connected with one end of the delivery pipe through a suction pump, and the suction pump is electrically connected with the control switch.

[0011] As a further improvement of the present application, the spray head is fixedly connected with a clamping block at the bottom end, a groove corresponding to the clamping block is formed at the top end of the stirring tank, and the groove is engaged with the clamping block.

[0012] As a further improvement of the present application, a magnetic block is fixedly connected in the groove, and the clamping block is made of magnetic material, and the clamping block and the magnetic block are mutually attracted.

[0013] As another improvement of the present application, a time controller is fixedly connected on the stirring tank, and the time controller is electrically connected with the alarm.

[0014] In summary, under normal circumstances, the temperature of the rotating shaft will be maintained within a normal range, at which time the elastic diaphragm will not contact the control switch even if it is slightly inflated and bulged due to the air pressure. When the magnetic sealing structure malfunctions and the temperature of the rotating shaft rises, the air pressure inside the inner cover will increase, which will cause the elastic diaphragm to expand and bulge outward. When the temperature of the rotating shaft is too high, the elastic diaphragm will expand to a large extent, so that when it rotates with the rotating shaft to the control switch, it will squeeze the control switch to trigger the alarm, reminding the staff to come over for maintenance. At the same time, the control switch is energized to the electromagnetic block, so that the electromagnetic block is attracted to the magnetic sheet through its own magnetism, thereby separating from the elastic diaphragm, avoiding the elastic diaphragm from being in contact with the control switch during continuous rotation and causing wear to the elastic diaphragm. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a shaft view of the stirring device of the first and second embodiments of the present application;

[0016] Figure 2 is an installation structure diagram of the magnetic sealing structure of the first embodiment of the present application;

[0017] Figure 3 is an installation side view of the magnetic sealing structure of the first and second embodiments of the present application;

[0018] Figure 4 is a top view of the detection mechanism of the first magnetic sealing structure of the present application;

[0019] Figure 5 is a structure diagram of the air tightness detection mechanism of the first embodiment of the present application;

[0020] Figure 6 is a nozzle installation structure diagram of the second embodiment of the present application.

[0021] Explanation of reference numerals in the drawings:

[0022] 1, stirring tank; 2, magnetic sealing structure; 3, nozzle; 4, rotating shaft; 5, conveying pipe; 6, liquid nitrogen tank; 7, groove; 8, clamping block; 9, outer cover; 10, inner cover; 11, air hole; 12, alarm; 13, elastic diaphragm; 14, control switch; 15, connecting plate; 16, power line; 17, magnetic sheet; 18, compression spring; 19, electromagnetic block. DETAILED DESCRIPTION

[0023] The two embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0024] First embodiment:

[0025] Figures 1-5Show a kind of high sealing magnetic sealing device, including stirring tank 1, stirring tank 1 top middle rotationally connected with the rotating shaft 4, the rotating shaft 4 is connected with the magnetic sealing structure 2 between stirring tank 1, magnetic sealing structure 2 is prior art, by the person skilled in the art with suitable magnetic sealing structure is installed, to realize the sealing between rotating shaft 4 and stirring tank 1;

[0026] The surface of rotating shaft 4 is provided with inner cover 10 above magnetic sealing structure 2, the top of magnetic sealing structure 2 is fixedly connected with outer cover 9 outside inner cover 10, the side wall of inner cover 10 is provided with air hole 11 passing through inner and outer cover 9, the air hole 11 is fixedly connected with elastic diaphragm 13, the inner wall of outer cover 9 is fixedly connected with electromagnetic block 19, the one end of electromagnetic block 19 close to inner cover 10 is fixedly connected with compression spring 18, the one end of compression spring 18 close to inner cover 10 is fixedly connected with connecting plate 15, and the one end of connecting plate 15 close to electromagnetic block 19 is fixedly connected with magnetic sheet 17 which is mutually attracted with electromagnetic block 19, the one end of connecting plate 15 close to inner cover 10 is installed with control switch 14, and electromagnetic block 19 is electrically connected with control switch 14 through power line 16, the alarm 12 electrically connected with control switch 14 is fixedly connected on stirring tank 1, and control switch 14 is obliquely designed on connecting plate 15.

[0027] Working principle: in the normal working state of the equipment, the temperature of rotating shaft 4 will maintain in a normal range, at this time, even if the elastic diaphragm 13 slightly expands due to air pressure, it will not contact control switch 14, when magnetic sealing structure 2 fails, the temperature of rotating shaft 4 rises, which will cause the air pressure inside inner cover 10 to increase, the air pressure increase will make elastic diaphragm 13 outwardly expand, when the temperature of rotating shaft 4 is too high, elastic diaphragm 13 will expand to a large extent, so that it rotates with rotating shaft 4 to control switch 14, which will press and trigger control switch 14, so as to trigger alarm 12, reminding the staff to come over for repair, at the same time, control switch 14 is powered to electromagnetic block 19, so that electromagnetic block 19 is attracted to itself through magnetic sheet 17, so as to separate from elastic diaphragm 13, avoiding that elastic diaphragm 13 keeps contacting control switch 14 in the continuous rotation of rotating shaft 4, causing wear to elastic diaphragm 13;

[0028] In the case of air pressure increase due to temperature rise in inner cover 10, elastic diaphragm 13 expands, so that it contacts control switch 14 and triggers alarm 12 to remind the staff to come over for repair when magnetic sealing structure 2 fails, at the same time, electromagnetic block 19 is magnetically attracted to magnetic sheet 17, which separates control switch 14 from elastic diaphragm 13 immediately after contacting, avoiding wear.

[0029] Second embodiment:

[0030] Figure 1 、 Figure 3 AndFigure 6 The outer layer cover 9 is provided with a spray head 3, the top end of the spray head 3 is threadedly connected with a conveying pipe 5, a liquid nitrogen tank 6 filled with liquid nitrogen is placed at the side of the stirring tank 1, the liquid nitrogen tank 6 is threadedly connected with one end of the conveying pipe 5 through a suction pump, the suction pump is electrically connected with a control switch 14, the bottom end of the spray head 3 is fixedly connected with a clamping block 8 in a ring shape at equal intervals, the top end of the stirring tank 1 is provided with a groove 7 corresponding to the clamping block 8, the groove 7 is clamped with the clamping block 8, a magnetic block is fixedly connected in the groove 7, the clamping block 8 is made of magnetic material, and the clamping block 8 and the magnetic block are attracted to each other, a time controller is fixedly connected to the stirring tank 1, and the time controller is electrically connected with a siren 12.

[0031] Working principle: when the magnetic sealing structure 2 is detected to have a leakage fault to trigger the siren 12, the time controller will be automatically started, when the siren 12 is sounded for a designed time, the siren 12 will be automatically turned off, avoiding continuous sounding of the siren to cause noise and affect the surrounding environment, and when the elastic diaphragm 13 and the control switch 14 are in contact, the suction pump will be automatically started to convey the liquid nitrogen into the spray head 3 through the conveying pipe 5 to be sprayed on the surface of the magnetic sealing structure 2 and the rotating shaft 4, so that it flows into the inside from the leakage gap to have a cooling effect, which can prevent more serious damage to the magnetic sealing structure 2 due to continuous heating before the staff arrives for repair;

[0032] When the elastic diaphragm 13 and the control switch 14 are in contact, the suction pump is automatically started to convey the liquid nitrogen to the spray head 3 to spray the liquid nitrogen on the rotating shaft 4 and the magnetic sealing structure 2, so that it flows into the inside from the leakage gap to have a cooling effect, which can prevent more serious damage to the magnetic sealing structure 2 due to continuous heating before the staff arrives for repair;

[0033] In combination with the current actual demand, the above-mentioned embodiments adopted by the present application are not limited to this, various changes made within the knowledge range of those skilled in the art without departing from the concept of the present application still fall within the protection range of the present application.

Claims

1. A magnetic sealing device with high sealing performance, comprising a stirring tank (1), a rotating shaft (4) is rotatably connected to the middle of the top end of the stirring tank (1), and a magnetic sealing structure (2) is connected between the rotating shaft (4) and the stirring tank (1), characterized in that: The surface of the rotating shaft (4) is sleeved with an inner cover (10) above the magnetic sealing structure (2), the top end of the magnetic sealing structure (2) is fixedly connected with an outer cover (9) outside the inner cover (10), the side wall of the inner cover (10) is provided with a gas permeable hole (11) penetrating through the inner and outer covers (9), the gas permeable hole (11) is fixedly connected with an elastic diaphragm (13), the inner wall of the outer cover (9) is fixedly connected with an electromagnetic block (19), the electromagnetic block (19) is fixedly connected with a compression spring (18) close to one end of the inner cover (10), the compression spring (18) is fixedly connected with a connecting plate (15) close to one end of the inner cover (10), and the connecting plate (15) is fixedly connected with a magnetic sheet (17) close to one end of the electromagnetic block (19), the connecting plate (15) is installed with a control switch (14) close to one end of the inner cover (10), and the electromagnetic block (19) is electrically connected with the control switch (14) through an electric wire (16), and the stirring tank (1) is fixedly connected with an alarm (12) electrically connected with the control switch (14).

2. A magnetic sealing device with high sealing performance according to claim 1, characterized in that: The control switch (14) is obliquely arranged on the connecting plate (15).

3. A magnetic sealing device with high sealing property according to claim 1, characterized in that: The outer cover (9) is sleeved with a spray head (3), the top end of the spray head (3) is threadedly connected with a conveying pipe (5), the side edge of the stirring tank (1) is placed with a liquid nitrogen tank (6) filled with liquid nitrogen, and the liquid nitrogen tank (6) is threadedly connected with one end of the conveying pipe (5) through a suction pump, and the suction pump is electrically connected with the control switch (14).

4. A magnetic sealing device with high sealing performance according to claim 3, characterized in that: The bottom end of the spray head (3) is fixedly connected with a clamping block (8) at equal intervals, the top end of the stirring tank (1) is provided with a groove (7) corresponding to the clamping block (8), and the groove (7) is clamped with the clamping block (8).

5. A magnetic sealing device with high sealing according to claim 4, characterized in that: The groove (7) is fixedly connected with a magnetic block, the clamping block (8) is made of magnetic material, and the clamping block (8) and the magnetic block are attracted to each other.

6. A magnetic sealing device with high sealing according to claim 1, characterized in that: The stirring tank (1) is fixedly connected with a time controller, and the time controller is electrically connected with the alarm (12).

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