37results about How to "Improve sealing pressure resistance" patented technology

The invention relates to a parallel type magnetofluid reciprocating sealing device. The device comprises a shaft, a shell, an outer ring magnetic conductive sleeve, a left pole shoe ring, a right poleshoe ring, permanent magnet rings I, permanent magnet rings II and permanent magnet rings III; the left pole shoe ring and the right pole shoe ring are arranged at the two ends of the inner wall of the outer ring magnetic conductive sleeve separately; more than one permanent magnet ring I is arranged on the inner wall, corresponding to the part between the left pole shoe ring and the right pole shoe ring, of the outer ring magnetic conductive sleeve at intervals in the axial direction; the permanent magnet rings II are arranged on the left end surface of the left pole shoe ring; the permanentmagnet rings III are arranged on the right end surface of the right pole shoe ring; and pole teeth I, pole teeth II and pole teeth III are arranged on the shaft. The device has the advantages that the problem that an existing single-magnetic-source magnetofluid sealing device and an existing multi-magnetic-source magnetofluid sealing device are low in pressure resistance can be solved, meanwhile,the stress concentration can be reduced, machining and assembling are simple, and therefore a sealing technology can be successfully applied to the fields of engineering machinery, aviation reciprocating shaft seal and the like.

The invention relates to the field of machinery engineering sealing, and concretely relates to a labyrinth-type magnetofluid sealing device. The device comprises a shaft, a housing, a first pole shoe ring, a second pole shoe ring, and a third pole shoe ring; the first pole shoe ring is positioned at the left side of the second pole shoe ring, a pole tooth I is established at the right end of the first pole shoe ring, an annular groove I is established at the left end of the first pole shoe ring, a permanent magnet I is arranged in the annular groove I, a pole tooth II and a pole tooth III are established at the left end of the second pole shoe ring, an annular groove II is established at the right end of the second pole shoe ring, a permanent magnet III is arranged in the annular groove II, the third pole shoe ring is arranged at the external circular surface of the second pole shoe ring, a space is kept between the third pole shoe ring and the first pole shoe ring, a permanent magnet II is arranged in the space, the pole tooth II is positioned over the pole tooth I at the top of the first pole shoe ring, the pole tooth III is positioned below the pole tooth I at the bottom of the first pole shoe ring, and the pole tooth I stretches into the space composed of the pole tooth II and the pole tooth III.

The invention discloses a hybrid connection type magnetic fluid seal structure. The space between the outer surface of a shaft and the inner wall of a shell body is internally provided with at least two magnetic fluid seal units, each magnetic fluid seal unit comprises a pair of circular pole shoes, pole teeth, a radial magnetization type permanent magnet ring and a seal ring, opposite end surfaces of every two pole shoes are provided with circular grooves correspondingly, and two sides of each radial magnetization type permanent magnet ring are clamped into the circular grooves of two corresponding pole shoes and fixed correspondingly; the side surfaces of every two pole shoes, the inner wall of the shell body and the outer circle surface of each radial magnetization type permanent magnetring enclose a containing space, and each seal ring is arranged inside the corresponding containing space; and an axial direction magnetization type permanent magnet ring is arranged between every two adjacent magnetic fluid seal units in a clamped manner, and the magnetic field direction of each radial magnetization type permanent magnet ring is the same as the direction of a magnetic return path of the corresponding axial direction magnetization type permanent magnet ring where the radial magnetization type permanent magnet ring is in. According to the hybrid connection type magnetic fluidseal structure, by means of improvement of the overall structure, on the one hand, magnetic leakage is reduced; on the other hand, the magnetic field strength is increased, and the seal pressure-resistant performance at seal gaps is improved.

The invention discloses a magnetic source mixing type magnetofluid sealing structure. The magnetic source mixing type magnetofluid sealing structure comprises a shell, a shaft and a plurality of poleshoes, wherein the pole shoes are arranged in the axial direction at intervals; an axial magnetizing type permanent magnet ring is sandwiched between each two adjacent pole shoes; the polarities of magnetic poles of each two adjacent axial magnetizing type permanent magnet rings are opposite; a radial magnetizing type permanent magnet ring is inserted in the inner circle surface of each pole shoe;a gap exists between the inner circle surface of each radial magnetizing type permanent magnet ring and the outer surface of the shaft and is injected with magnetofluid; the polarities of magnetic poles of each two adjacent radial magnetizing type permanent magnet rings are opposite; each radial magnetizing type permanent magnet ring is positioned in a magnetic loop formed by the corresponding axial magnetizing type permanent magnet ring and the pole shoes on the two sides of the corresponding axial magnetizing type permanent magnet ring; and the magnetic field direction of each radial magnetizing type permanent magnet ring is the same as the direction of the magnetic loop in which the radial magnetizing type permanent magnet ring is located. The magnetic field intensity is increased, sealing and pressure-resistant pressure are enhanced, magnetofluid seals in all the gaps can play a role, and the sealing pressure resistance is ensured.

The invention discloses a stepped shaft type magnetofluid sealing device. The stepped shaft type magnetofluid sealing device comprises a shaft, an outer shell, sealing rings, pole shoes, magnetofluidand permanent magnets. The shaft penetrates the outer shell, extends out of the two ends of the outer shell and comprises a stepped shaft part, wherein the stepped shaft part is located inside the outer shell. The diameter of a middle step of the stepped shaft part is the maximum, and the diameters of steps at the left side and the right side are decreased progressively and sequentially. Every twoadjacent steps are in circular-truncated-cone transition. The stepped shaft part is provided with cylinder side faces and multiple circular-truncated-cone side faces, wherein the cylinder side facesare parallel with the axis of the shaft, and the circular-truncated-cone side faces are symmetrical about the axis. The inner surface of the outer shell is provided with the two or more pole shoes. Each annular permanent magnet is arranged between the corresponding two adjacent pole shoes. Each pole shoe is provided with radial pole teeth and bevel pole teeth, wherein the radial pole teeth protrude toward the cylinder side faces, and the bevel pole teeth protrude toward the circular-truncated-cone side faces. The magnetofluid is arranged between the radial pole teeth and the cylinder side faces as well as between the bevel pole teeth and the circular-truncated-cone side faces. By means of the stepped shaft type magnetofluid sealing device, the sealing capability and pressure endurance capability of the magnetofluid are greatly enhanced; and the problem that existing sealing devices cannot meet the high-sealing-performance requirement under special working conditions such as the high speed and heavy load is solved.