Magnetic source laminated labyrinth type magnetic liquid sealing structure

Abstract

The utility model discloses a magnetic source laminated labyrinth type magnetic liquid sealing structure, which is characterized in that the sealing structure comprises a static ring and a moving ring, a plurality of permanent magnet rings are arranged in a space formed after the static ring and the moving ring are assembled with each other, each permanent magnet ring and a rotating shaft are laminated in the space in parallel, and the permanent magnet rings are arranged in the space. A plurality of permanent magnet rings in the space form a sealing gap, magnetic fluid is injected into the sealing gap, and each permanent magnet ring is composed of an N-pole permanent magnet part and an S-pole permanent magnet part; compared with the prior art that sealing leakage suppression is carried out through dynamic sealing, the magnetofluid is trapped in the sealing gap through the permanent magnet ring, and the zero leakage effect is achieved under certain sealing pressure.

Description

TECHNICAL FIELD

[0001] The utility model belongs to magnetic liquid sealing technical field, concretely relates to a kind of magnetic source laminated labyrinth magnetic liquid sealing structure. BACKGROUND

[0002] Patent announcement No.CN115076374B describes a kind of throttling high efficiency and gap fixed non-contact self-impact seal and patent publication No.CN118309797A describes a kind of fixing device of overhanging column in self-impact seal structure, two prior art techniques have the advantages of non-contact seal zero wear, high stability, but its sealing form is difficult to realize the absolute sealing in true sense, it is difficult to realize "zero leakage", the present application utilizes annular permanent magnet and adsorbs magnetic fluid in sealing gap, under certain sealing pressure condition, it can realize the absolute sealing in true sense. SUMMARY

[0003] In order to achieve the technical purpose of the background art, a magnetic source laminated labyrinth magnetic liquid sealing structure is proposed, which is based on a sealing scheme of fluid blocking, fills the sealing gap with magnetic fluid, realizes leakage suppression and blocking, uses annular permanent magnet to adsorb magnetic fluid in the sealing gap, and can realize absolute sealing in true sense under certain sealing pressure condition.

[0004] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0005] A magnetic source laminated labyrinth magnetic liquid sealing structure, characterized in that: the sealing structure comprises a static ring and a dynamic ring, and the static ring and the dynamic ring are assembled to form a space in which a plurality of permanent magnet rings are installed, each permanent magnet ring is parallel to the shaft and is stacked in the space, the plurality of permanent magnet rings in the space constitute a sealing gap, magnetic fluid is injected into the sealing gap, and each permanent magnet ring is composed of an N-pole permanent magnet part and an S-pole permanent magnet part.

[0006] Further, the static ring comprises end static rings and a middle static ring, and the middle static ring is located between the two end static rings.

[0007] Further, valve body mounting areas are provided on the end static rings and the middle static ring, a valve body is installed in the valve body mounting area, and the valve body is used to add magnetic fluid.

[0008] Further, the dynamic ring is arranged on a shaft sleeve, a shaft is installed in the shaft sleeve, one end of the shaft sleeve is a spiral locking part, and the other end is a spiral positioning part.

[0009] Further, threaded connection areas are provided on the dynamic ring and the static ring, one end of the corresponding permanent magnet ring is designed as a threaded joint, and the permanent magnet ring is installed in the threaded connection area of the dynamic ring and the static ring through the threaded joint.

[0010] Further, the valve body comprises a pressure spring, a sealing valve sheet and a valve body.

[0011] The above technical scheme can obtain the following beneficial effects:

[0012] Compared with the previous dynamic sealing, the magnetic fluid is "trapped" in the sealing gap by the permanent magnet ring, so as to achieve the effect of "zero leakage" under a certain sealing pressure. The core advantages of the utility model are two points, which are specifically:

[0013] It has zero wear and high stability, and can achieve absolute sealing effect under certain sealing pressure conditions. When the sealing pressure is within the blocking capacity of the magnetic fluid, it is hindered by the magnetic fluid, and the absolute sealing effect can be achieved.

[0014] It has self-modification ability. Under certain pressure conditions, even if part of the magnetic fluid is lost, the remaining magnetic fluid can still be affected by the adsorption force of the permanent magnet ring for self-repairing, and the absolute sealing can be continued.

[0015] It is convenient to supplement the lost magnetic fluid. The sealing end face is provided with a plurality of valve bodies, and the valve bodies can be used to inject magnetic fluid to realize magnetic fluid supplement. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A magnetic source laminated labyrinth type magnetic liquid sealing main body structure diagram of the embodiment of the application is shown;

[0017] Figure 2 A magnetic fluid filling sealing gap schematic diagram of the embodiment of the application is shown;

[0018] Figure 3 A magnetic fluid filling sealing gap schematic diagram of the embodiment of the application is shown;

[0019] Figure 4 A rotating shaft sleeve part structure schematic diagram of the embodiment of the application is shown;

[0020] Figure 5 A sealing effect schematic diagram of the embodiment of the application is shown;

[0021] Figure 6 A dynamic ring part structure schematic diagram of the embodiment of the application is shown;

[0022] Figure 7 An end static ring part structure schematic diagram of the embodiment of the application is shown;

[0023] Figure 8 A permanent magnet ring part structure schematic diagram of the embodiment of the application is shown;

[0024] Figure 9 A valve body structure schematic diagram of the embodiment of the application is shown.

[0025] In the drawings:

[0026] 1, end static ring; 2, sealing ring; 3, middle static ring; 4, dynamic ring; 5, rotating shaft sleeve; 6, rotating shaft; 7, locking nut, 8, permanent magnet ring, 9, valve body, 10, magnetic fluid. DETAILED DESCRIPTION

[0027] The utility model will be further described below in combination with the drawings:

[0028] As Figures 1-9 shown, a magnetic source laminated labyrinth type magnetic liquid sealing structure, the sealing structure includes static ring and dynamic ring, wherein, static ring includes end static ring 1 and middle static ring 3, the middle static ring is located in the middle of the end static ring on both sides, and sealing ring 2 is installed between end static ring 1 and middle static ring 3, static ring and dynamic ring 4 are mutually assembled to form a space cavity, and several permanent magnet rings 8 are installed in the space, each permanent magnet ring is parallel to the rotating shaft and is laminated in the space, and the several permanent magnet rings in the space constitute a sealing gap, magnetic fluid 10 is injected into the sealing gap, each permanent magnet ring is composed of N-pole permanent magnet part 801 and S-pole part 502 permanent magnet part, one end of the permanent magnet ring is designed into a threaded joint 803, a plurality of spiral connection zones are provided on the dynamic ring and the static ring, each permanent magnet ring is installed on the spiral connection zone through the threaded joint, a valve body mounting area 102 is provided on the end static ring and the middle static ring, a valve body 9 is installed in the valve body mounting area, and the valve body is used to inject magnetic fluid 10. Dynamic ring 4 is arranged on rotating shaft sleeve 5, the shaft sleeve is fixed at both ends of the dynamic ring through positioning nut 11 and locking nut 7 respectively, rotating shaft 6 is installed in rotating shaft sleeve, one end of the rotating shaft sleeve is spiral locking part 502, and the other end is spiral positioning part 501.

[0029] A plurality of permanent magnet rings 8 are fixed on dynamic ring 4 and static ring 1 by threads, before installation and use, magnetic fluid 10 is injected into the sealing gap, magnetic fluid 10 is adsorbed in the sealing gap by using permanent magnet ring 8, under the influence of the magnetic field, the magnetic fluid is not easy to leak in the sealing gap. Under the working condition of dynamic sealing, the magnetic fluid 10 in the sealing gap will hinder the leakage of the sealing medium, under certain pressure conditions, even if part of the magnetic fluid 10 is lost, the remaining magnetic fluid 10 is still affected by the adsorption force of the permanent magnet ring 8 to repair itself, and the absolute sealing can be continued, and the magnetic fluid can be injected through the valve body 9 to compensate the loss during maintenance.

[0030] Figure 9As shown, the valve body mounting area bottom is provided with a liquid flow channel 904, the valve body mounting area bottom is provided with an extrusion rod 903, the extrusion rod 903 is provided with a pressure spring 901, and the other end of the extrusion rod is provided with a baffle 902; pressing one side of the extrusion rod 903, the pressure spring 901 is compressed, the baffle 902 moves to the right, at this time, the liquid flow channel 904 is open, if the baffle 902 moves to the left and contacts the outer wall of the liquid flow channel 904, the liquid flow channel is closed; it should be noted that the baffle 902 is made of soft material, and if it is attached to the liquid flow channel 904 under the action of the pressure spring 901, it can be attached well and sealed to prevent leakage.

[0031] The assembly process is as follows:

[0032] 1. Connect the plurality of permanent magnet rings 8 to the end static ring end threaded connection area 101 on the end static ring 1 through the end threaded joint 803;

[0033] 2. Connect the plurality of permanent magnet rings 8 to the dynamic ring threaded connection area 401 on the dynamic ring 4 through the end threaded joint 803;

[0034] 3. Install the dynamic ring 4 with the plurality of permanent magnet rings 8 successfully added above on the rotating shaft sleeve 5 through the positioning nut 11;

[0035] 4. Connect the rotating shaft sleeve 5 with the sealing ring 2 and the dynamic ring 4 successfully installed above to the rotating shaft 6;

[0036] 5. Coaxially connect the middle static ring 3 with the sealing ring added to the parts installed above;

[0037] 6. Connect the plurality of permanent magnet rings 8 to the threaded connection area on the end static ring 1 through the end threaded joint 803, and mirror image installation into the sealing part;

[0038] 7. Fix the sealing part by the locking nut 7, and add magnetic fluid to the valve body 9;

[0039] 8. After all the parts are sealed, install the assembled device at the rotating shaft to be sealed.

[0040] The above described are preferred embodiments of the present application, and for those skilled in the art, various equivalent modifications of the present application without departing from the principles of the present application are all within the protection scope of the appended claims of the present application.

Claims

1. A magnetic source stacked labyrinth-type magnetic liquid sealing structure, characterized in that: The sealing structure includes a stationary ring and a rotating ring. After the stationary ring and the rotating ring are assembled together, a number of permanent magnet rings are installed in the space. Each permanent magnet ring is stacked in the space parallel to the rotating shaft. The number of permanent magnet rings in the space constitutes a sealing gap. Magnetic fluid is injected into the sealing gap. Each permanent magnet ring consists of an N-pole permanent magnet part and an S-pole permanent magnet part.

2. The magnetic source stacked labyrinth-type magnetic liquid sealing structure according to claim 1, characterized in that: The stationary ring includes an end stationary ring and a middle stationary ring, with the middle stationary ring located between the two end stationary rings.

3. The magnetic source stacked labyrinth-type magnetic liquid sealing structure according to claim 2, characterized in that: Valve body mounting areas are opened on the end stationary ring and the middle stationary ring. The valve body is installed in the valve body mounting area and magnetic fluid is injected through the valve body.

4. The magnetic source stacked labyrinth-type magnetic liquid sealing structure according to claim 1, characterized in that: The moving ring is mounted on the rotating shaft sleeve, and the rotating shaft is installed inside the rotating shaft sleeve. One end of the rotating shaft sleeve is a spiral locking part, and the other end is a spiral positioning part.

5. A magnetic source stacked labyrinth-type magnetic liquid sealing structure according to claim 1 or 4, characterized in that: The rotating ring and the stationary ring are provided with threaded connection areas. One end of the corresponding permanent magnet ring is designed as a threaded joint. The permanent magnet ring is installed to the threaded connection of the rotating ring and the stationary ring through the threaded joint.

6. The magnetic source stacked labyrinth-type magnetic liquid sealing structure according to claim 2, characterized in that: The valve body includes a pressure spring, a sealing valve plate, and the valve body itself.

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