Reciprocating type magnetic fluid sealing device

Abstract

The utility model discloses a reciprocating type magnetic fluid sealing device, which belongs to the technical field of magnetic fluid sealing and comprises a shell, and linear bearings are fixedly mounted at two ends of an inner cavity of the shell respectively. According to the utility model, two groups of inner fixed magnetic fluid sealing mechanisms, L-shaped inner sealing rings, elastic rubber rings, L-shaped outer sealing rings and outer fixed magnetic fluid sealing mechanisms are arranged between the shell and the transmission shaft; the magnetic fluid which moves along with the transmission shaft and is separated from the reciprocating magnetic fluid sealing mechanism is blocked by the inner fixed magnetic fluid sealing mechanism, the L-shaped inner sealing ring, the elastic rubber ring, the L-shaped outer sealing ring and the outer fixed magnetic fluid sealing mechanism. The magnetofluid blocked by the elastic rubber ring and other structures is absorbed by the reciprocating magnetofluid sealing mechanism again, and the magnetofluid is prevented from being lost.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnetic fluid sealing technical field more specifically, relate to a reciprocating magnetic fluid sealing device. BACKGROUND

[0002] Magnetic fluid sealing technology is dependent on the rise of magnetic fluid, when magnetic fluid is injected into the gap, can fill the gap, and form O type sealing structure, thereby forming a sealed container, commonly used for vacuum sealing of rotating mechanism, also used for reciprocating motion mechanism sealing.

[0003] After retrieval, the utility model discloses a reciprocating magnetic fluid sealing device with publication No. CN212080169U, including casing, transmission shaft, magnetic fluid sealing mechanism, magnetic fluid collection mechanism, the magnetic fluid collection mechanism includes collection magnet, magnetic ring and scraper, the magnetic fluid collection mechanism includes first magnetic fluid collection mechanism and second magnetic fluid collection mechanism, the magnetic fluid of magnetic fluid sealing mechanism is in the reciprocating motion of transmission shaft, a part of motion with transmission shaft and separates from magnetic fluid sealing mechanism, and the magnetic fluid that separates is scraped down by scraper, and the magnetic fluid that scrapes down is gathered under the action of collection magnet, and the magnetic fluid under collection magnet is partially adhered on transmission shaft in reciprocating motion, and the part of magnetic fluid is reabsorbed when magnetic fluid sealing mechanism passes, thereby preventing the loss of magnetic fluid, and the first linear bearing and the second linear bearing are used to provide mechanism support for transmission shaft, improve the bearing capacity of the utility model. The above-mentioned patent still has the following deficiencies: although the scraper can intercept the magnetic fluid that separates, but with the mutual sliding between transmission shaft and scraper, can cause the abrasion to the inside of scraper, influence the effect of collecting magnetic fluid subsequently. For this, we put forward a reciprocating magnetic fluid sealing device. UTILITY MODEL CONTENTS

[0004] In view of the problems existing in the prior art, the utility model aims at providing a reciprocating magnetic fluid sealing device.

[0005] To solve the above problems, the utility model discloses the following technical scheme: a reciprocating magnetic fluid sealing device, including the shell, the two ends of the shell inner chamber are fixedly installed with linear bearing respectively, the inside of two linear bearings is equipped with transmission shaft, the middle part of the shell inner chamber is provided with reciprocating magnetic fluid sealing mechanism, the inside surface of reciprocating magnetic fluid sealing mechanism and the outside surface of transmission shaft are in conjunction, the both sides of the shell inner chamber are equipped with the outer fixed ring respectively, and the end of two outer fixed rings is fixedly connected with L-shaped outer sealing ring, and the outside of L-shaped outer sealing ring is equipped with outer fixed magnetic fluid sealing mechanism, and the outside surface of outer fixed magnetic fluid sealing mechanism and the inner wall of shell are in conjunction, the outside of transmission shaft is equipped with two inner fixed rings, and the one end of two inner fixed rings is fixedly connected with L-shaped inner sealing ring, and the inside of two L-shaped inner sealing rings is equipped with inner fixed magnetic fluid sealing mechanism, and the inside surface of inner fixed magnetic fluid sealing mechanism and the side of transmission shaft are in conjunction, and the L-shaped outer sealing ring and L-shaped inner sealing ring are fixedly connected with the elastic rubber ring between.

[0006] As a preferred scheme of the utility model, the outside of transmission shaft is provided with a plurality of first screw holes, the outside of inner fixed ring is provided with a plurality of first mounting holes, the inner cavity of first mounting hole is equipped with first screw, and the end of first screw is screwed to the inner cavity of first screw hole.

[0007] As a preferred scheme of the utility model, the outside of outer fixed ring is provided with a plurality of second screw holes, the side of shell is provided with a plurality of second mounting holes, the inner cavity of second mounting hole is equipped with second screw, and the end of second screw is screwed to the inner cavity of second screw hole.

[0008] As a preferred scheme of the utility model, the both ends of shell are provided with a plurality of third screw holes respectively, and the both ends of shell are provided with cover, a plurality of third screws are equipped on two covers, and the end of third screw is screwed to the inner cavity of third screw hole.

[0009] As a preferred scheme of the utility model, the outside of one end of shell is fixedly sleeved with flange, and a plurality of third mounting holes are formed in the flange.

[0010] As a preferred scheme of the utility model, the inner diameter of second screw hole and second mounting hole is greater than the outer diameter of first screw.

[0011] Compared with the prior art, the utility model discloses the advantages lie in: in the utility model, install two groups of inner fixed magnetic fluid sealing mechanism, L shape inner sealing ring, elastic rubber ring, L shape outer sealing ring and outer fixed magnetic fluid sealing mechanism between the casing and transmission shaft, in the process that transmission shaft is active, the magnetic fluid that with transmission shaft motion separates from reciprocating magnetic fluid sealing mechanism is blocked by inner fixed magnetic fluid sealing mechanism, L shape inner sealing ring, elastic rubber ring, L shape outer sealing ring and outer fixed magnetic fluid sealing mechanism, in addition, when elastic rubber ring and other structures are close to reciprocating magnetic fluid sealing mechanism, the magnetic fluid that is blocked by elastic rubber ring and other structures is reabsorbed by reciprocating magnetic fluid sealing mechanism, prevent the loss of magnetic fluid, also avoid the problem that the wear and tear of scraper occurs when collecting through scraper. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is whole structure schematic diagram of the utility model;

[0013] Figure 2 It is whole structure explosion drawing of the utility model;

[0014] Figure 3 It is whole cross section schematic diagram of the utility model;

[0015] Figure 4 It is structure schematic diagram of the casing of the utility model;

[0016] Figure 5 It is cross section schematic diagram of the inner fixed ring of the utility model.

[0017] Mark explanation in drawing: 1, casing;2, transmission shaft;3, linear bearing;4, reciprocating magnetic fluid sealing mechanism;5, outer fixed ring;6, L shape outer sealing ring;7, outer fixed magnetic fluid sealing mechanism;8, inner fixed ring;9, L shape inner sealing ring;10, inner fixed magnetic fluid sealing mechanism;11, elastic rubber ring;12, third screw hole;13, cover;14, third screw;15, first screw hole;16, first mounting hole;17, first screw;18, second screw hole;19, second mounting hole;20, second screw;21, flange plate;22, third mounting hole. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiments of the utility model will be described clearly and completely below with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, and all other embodiments obtained by the person skilled in the art without creative labor based on the embodiments in the utility model belong to the protection scope of the utility model.

[0019] In the description of the utility model, it needs to explain, the term "upper", "lower", "inner", "outer", "top / bottom end" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore cannot be understood as the limitation of the utility model. In addition, the term "first", "second" is only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the utility model, it needs to explain, unless otherwise explicitly provided and limited, the term "installation", "set with", "sleeve set / interface", "connection" and so on, should be understood broadly, for example, "connection", can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances. Example 1

[0021] Please refer to Figures 1-5 A reciprocating magnetic fluid sealing device, including the shell 1, the two ends of the shell 1 inner cavity are fixedly installed with linear bearing 3, the inner side of two linear bearings 3 is sleeved with transmission shaft 2, the middle part of the shell 1 inner cavity is provided with reciprocating magnetic fluid sealing mechanism 4, the inner side surface of reciprocating magnetic fluid sealing mechanism 4 and the outer side surface of transmission shaft 2 are in close contact, the two sides of the shell 1 inner cavity are respectively sleeved with outer fixed ring 5, the end of two outer fixed rings 5 is fixedly connected with L-shaped outer sealing ring 6, the outer side of L-shaped outer sealing ring 6 is sleeved with outer fixed magnetic fluid sealing mechanism 7, the outer side surface of outer fixed magnetic fluid sealing mechanism 7 and the inner wall of shell 1 are in close contact, the outer side of transmission shaft 2 is sleeved with two inner fixed rings 8, one end of two inner fixed rings 8 is fixedly connected with L-shaped inner sealing ring 9, the inner side of two L-shaped inner sealing rings 9 is sleeved with inner fixed magnetic fluid sealing mechanism 10, the inner side surface of inner fixed magnetic fluid sealing mechanism 10 and the side surface of transmission shaft 2 are in close contact, L-shaped outer sealing ring 6 and L-shaped inner sealing ring 9 are fixedly connected with elastic rubber ring 11.

[0022] In this embodiment, the reciprocating magnetic fluid sealing mechanism 4, the outer fixed magnetic fluid sealing mechanism 7 and the inner fixed magnetic fluid sealing mechanism 10 are all composed of permanent magnets, pole shoes and magnetic fluids, which are the existing magnetic fluid sealing technology. The permanent magnet on the reciprocating magnetic fluid sealing mechanism 4 is installed on the inner wall of the shell 1, and pole shoes are arranged on both sides of the permanent magnet. The magnetic liquid groove is arranged on the outer side of the pole shoe close to the transmission shaft 2, and the magnetic fluid is arranged on the magnetic liquid groove. The permanent magnet on the outer fixed magnetic fluid sealing mechanism 7 is installed on the outer side of the L-shaped outer sealing ring 6, and pole shoes are arranged on both sides of the permanent magnet. The magnetic liquid groove is arranged on the inner wall of the shell 1 close to the pole shoe, and the magnetic fluid is arranged on the magnetic liquid groove. The permanent magnet on the inner fixed magnetic fluid sealing mechanism 10 is installed on the inner wall of the shell 1, and pole shoes are arranged on both sides of the permanent magnet. The magnetic liquid groove is arranged on the outer side of the pole shoe close to the transmission shaft 2, and the magnetic fluid is arranged on the magnetic liquid groove. The position between the outer fixed magnetic fluid sealing mechanism 7 and the shell 1 is fixed, the position between the inner fixed magnetic fluid sealing mechanism 10 and the transmission shaft 2 is fixed, the outer side of the reciprocating magnetic fluid sealing mechanism 4 is fixed with the shell 1, and the inner side of the reciprocating magnetic fluid sealing mechanism 4 reciprocates with the transmission shaft 2.

[0023] Specifically, please refer to Figure 3 and Figure 5 A plurality of first screw holes 15 are arranged on the outer side of the transmission shaft 2, a plurality of first mounting holes 16 are arranged on the outer side of the inner fixed ring 8, the inner cavity of the first mounting hole 16 is sleeved with a first screw 17, and the end of the first screw 17 is screwed into the inner cavity of the first screw hole 15.

[0024] In this embodiment, the inner fixed ring 8 is installed on the outer side of the transmission shaft 2 through the cooperation of the first screw hole 15, the first mounting hole 16 and the first screw 17.

[0025] Specifically, please refer to Figures 3 to 5 A plurality of second screw holes 18 are arranged on the outer side of the outer fixed ring 5, a plurality of second mounting holes 19 are arranged on the side of the shell 1, the inner cavity of the second mounting hole 19 is sleeved with a second screw 20, and the end of the second screw 20 is screwed into the inner cavity of the second screw hole 18.

[0026] In this embodiment, the outer fixed ring 5 is installed on the inner wall of the shell 1 through the cooperation of the second screw hole 18, the second mounting hole 19 and the second screw 20.

[0027] Specifically, please refer to Figure 1 and Figure 2 A plurality of third screw holes 12 are arranged on both ends of the shell 1, a cover 13 is arranged on both ends of the shell 1, a plurality of third screws 14 are sleeved on the two covers 13, and the end of the third screw 14 is screwed into the inner cavity of the third screw hole 12.

[0028] In the embodiment, the cover 13 is installed through the cooperation of the third screw hole 12 and the third screw 14, and the two ends of the shell 1 are sealed through the cover 13, and the inner cavity of the cover 13 is provided with a through hole, and the transmission shaft 2 penetrates through the through hole and is movable.

[0029] Specifically, please refer to Figure 4 The flange plate 21 is sleeved on the outer portion of one end of the shell 1, and a plurality of third mounting holes 22 are arranged on the flange plate 21.

[0030] In the embodiment, the shell 1 is fixed through the cooperation of the third mounting hole 22, the flange plate 21 and the bolt.

[0031] Specifically, please refer to Figures 1 to 5 The inner diameters of the second screw hole 18 and the second mounting hole 19 are greater than the outer diameter of the first screw 17.

[0032] In the embodiment, it is ensured that the first screw 17 can be inserted into the inner cavity of the shell 1 through the second screw hole 18 and the second mounting hole 19, so as to be installed on the transmission shaft 2 and further fix the inner fixing ring 8.

[0033] Working principle: when in use, the transmission shaft 2 reciprocates in the inner side of the shell 1, the shell 1 and the transmission shaft 2 are sealed through the reciprocating magnetic fluid sealing mechanism 4, the L-shaped outer sealing ring 6 and the shell 1 are sealed through the outer fixed magnetic fluid sealing mechanism 7, the L-shaped inner sealing ring 9 and the transmission shaft 2 are sealed through the inner fixed magnetic fluid sealing mechanism 10, the L-shaped inner sealing ring 9, the inner fixed magnetic fluid sealing mechanism 10 and the inner fixing ring 8 are synchronously moved in the moving process of the transmission shaft 2, at this time, the elastic rubber ring 11 is stretched or shrunk, when the transmission shaft 2 moves, the magnetic fluid moving away from the reciprocating magnetic fluid sealing mechanism 4 is blocked by the inner fixed magnetic fluid sealing mechanism 10, the L-shaped inner sealing ring 9, the elastic rubber ring 11, the L-shaped outer sealing ring 6 and the outer fixed magnetic fluid sealing mechanism 7, in addition, when the elastic rubber ring 11 and the like structure is close to the reciprocating magnetic fluid sealing mechanism 4, the magnetic fluid blocked by the elastic rubber ring 11 and the like structure is reabsorbed by the reciprocating magnetic fluid sealing mechanism 4, so that the magnetic fluid is prevented from flowing out.

[0034] The above only describes a preferred embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and improvement concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A reciprocating magnetic fluid seal comprising a housing (1) characterised in that: The inner cavity of the shell (1) is fixedly provided with linear bearings (3) at both ends, the inner sides of the two linear bearings (3) are sleeved with a transmission shaft (2), the middle part of the inner cavity of the shell (1) is provided with a reciprocating magnetic fluid sealing mechanism (4), the inner side surface of the reciprocating magnetic fluid sealing mechanism (4) is attached to the outer side surface of the transmission shaft (2), both sides of the inner cavity of the shell (1) are sleeved with outer fixed rings (5), the end portions of the two outer fixed rings (5) are fixedly connected with L-shaped outer sealing rings (6), the outer side of the L-shaped outer sealing ring (6) is sleeved with an outer fixed magnetic fluid sealing mechanism (7), the outer side surface of the outer fixed magnetic fluid sealing mechanism (7) is attached to the inner wall of the shell (1), the outer side of the transmission shaft (2) is sleeved with two inner fixed rings (8), one end of each of the two inner fixed rings (8) is fixedly connected with an L-shaped inner sealing ring (9), the inner sides of the two L-shaped inner sealing rings (9) are sleeved with inner fixed magnetic fluid sealing mechanisms (10), the inner side surface of the inner fixed magnetic fluid sealing mechanism (10) is attached to the side surface of the transmission shaft (2), and the L-shaped outer sealing ring (6) and the L-shaped inner sealing ring (9) are fixedly connected with an elastic rubber ring (11).

2. A reciprocating magnetic fluid seal according to claim 1, wherein: A plurality of first screw holes (15) are formed in the outer side of the transmission shaft (2), a plurality of first mounting holes (16) are formed in the outer side of the inner fixed ring (8), the inner cavity of the first mounting hole (16) is sleeved with a first screw (17), and the end portion of the first screw (17) is threadedly mounted into the inner cavity of the first screw hole (15).

3. A reciprocating magnetic fluid seal according to claim 2, wherein: A plurality of second screw holes (18) are formed in the outer side of the outer fixed ring (5), a plurality of second mounting holes (19) are formed in the side surface of the shell (1), the inner cavity of the second mounting hole (19) is sleeved with a second screw (20), and the end portion of the second screw (20) is threadedly mounted into the inner cavity of the second screw hole (18).

4. A reciprocating magnetic fluid seal according to claim 1, wherein: A plurality of third screw holes (12) are formed at both ends of the shell (1), the both ends of the shell (1) are provided with covers (13), a plurality of third screws (14) are sleeved on the two covers (13), and the end portions of the third screws (14) are threadedly mounted into the inner cavities of the third screw holes (12).

5. A reciprocating magnetic fluid seal as defined in claim 1 wherein: A flange plate (21) is fixedly sleeved on the outer side of one end of the shell (1), and a plurality of third mounting holes (22) are formed in the flange plate (21).

6. A reciprocating magnetic fluid seal according to claim 3, wherein: The inner diameters of the second screw holes (18) and the second mounting holes (19) are greater than the outer diameter of the first screw (17).

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