Modular, temperature-adaptable magnetic liquid seal

Abstract

The magnetic liquid sealing device of the present application belongs to the field of mechanical engineering sealing. The device is composed of the following components: main shaft, magnetic liquid I, pole shoe ring I, shell, sealing ring I, pump I, container I, sealing ring II, electromagnet I, magnetic conducting sleeve, electromagnet II, pump II, container II, sealing ring III, pole shoe ring II, magnetic liquid II, sealing ring IV, end cover. The sealing device composed of these components is a module that can be used in stack. Two kinds of magnetic liquids are used alternately or simultaneously, which expands the applicable temperature range of the magnetic liquid sealing. The sealing device is modularized, and different types of magnetic liquids can be used in different modules to have different applicable temperature ranges. The magnetic liquid sealing can be used in a wide temperature range by connecting the modules in series. The electromagnet is used as the magnetic source, and according to different working temperatures, the state of each magnetic liquid sealing can be independently controlled through cooperation with the pump to prevent permanent failure of the magnetic liquid due to temperature problems.

Description

Technical Field

[0001] This invention belongs to the field of mechanical engineering sealing technology, specifically relating to a modular magnetic liquid sealing device that adapts to varying temperatures. Background Technology

[0002] Magnetic fluid seals have the advantages of zero leakage, long life and low friction, and are widely used in the sealing field. However, in practical applications, ordinary magnetic fluid sealing devices have great limitations. First, non-modular sealing devices have low maintainability and are inconvenient to debug. Second, due to the limited applicable temperature range of a single magnetic fluid, the sealing performance decreases or even leads to seal failure when the working temperature exceeds the applicable temperature range of the magnetic fluid. Therefore, a modular magnetic fluid sealing device that adapts to variable temperature is proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a modular magnetic liquid sealing device that is adaptable to varying temperatures.

[0004] A modular, temperature-adaptive magnetic liquid sealing device is characterized in that the sealing device comprises a main shaft (1), magnetic liquid I (2), pole shoe ring I (3), outer shell (4), sealing ring I (5), pump I (6), container I (7), sealing ring II (8), electromagnet I (9), magnetic sleeve (10), electromagnet II (11), pump II (12), container II (13), sealing ring III (14), pole shoe ring II (15), magnetic liquid II (16), sealing ring IV (17), and end cap (18); the sealing device composed of these components is a modular device that can be stacked and used.

[0005] The connection between the various parts of the sealing device is as follows: the sealing ring I and the sealing ring II are installed in the groove on the outer circular surface of the pole shoe ring I to form the left pole shoe ring with sealing rings; the sealing ring III and the sealing ring IV are installed in the groove on the outer circular surface of the pole shoe ring II to form the right pole shoe ring with sealing rings.

[0006] Electromagnet I is glued to the left end face of the magnetic sleeve, and electromagnet II is glued to the right end face of the magnetic sleeve, forming a magnetic source assembly with electromagnets; pump I and pump II are installed on the outer shell by threaded connection; container I is threaded to pump I; container II is threaded to pump II.

[0007] The left pole shoe ring with a sealing ring, the magnetic source assembly with an electromagnet, and the right pole shoe ring with a sealing ring are sequentially installed into the housing. The right side is screwed into the housing through the end cap thread to press the right pole shoe ring, so that the left pole shoe ring with a sealing ring, the magnetic source assembly with an electromagnet, and the right pole shoe ring with a sealing ring can be in close contact. The left pole shoe ring with a sealing ring and the right pole shoe ring with a sealing ring are in close contact with the inner circular surface of the housing to form a seal. Sufficient magnetic fluid is injected between the main shaft and the upper pole teeth of the left and right pole shoe rings to form a magnetic fluid seal.

[0008] Compared with ordinary magnetic liquid sealing devices, the advantages of this invention are:

[0009] 1. The use of two magnetic liquids, either alternating or simultaneously, expands the applicable temperature range of the magnetic liquid seals. 2. In the overlapping temperature ranges of the two magnetic liquids, the simultaneous operation of each magnetic liquid seal enhances the sealing effect of the device. 3. The sealing device is modular; different types of magnetic liquids can be used in different modules to achieve different applicable temperature ranges. By connecting the modules in series, the magnetic liquid seals can be used across a wide temperature range. 4. Using an electromagnet as the magnetic source, the state of each magnetic liquid seal can be independently controlled according to the operating temperature through coordination with the pump, preventing permanent failure of the magnetic liquid due to temperature issues. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the magnetic liquid sealing device of the present invention;

[0011] Figure 2 This is a schematic diagram of the working condition when the operating temperature meets the applicable temperature range of magnetic liquid I but exceeds the applicable temperature range of magnetic liquid II.

[0012] Figure 3 This is a schematic diagram of the working conditions when the operating temperature meets the applicable temperature range of magnetic liquid II but exceeds the applicable temperature range of magnetic liquid I.

[0013] Figure 1 , Figure 2 , Figure 3 In the middle: main shaft (1), magnetic fluid I (2), pole shoe ring I (3), outer shell (4), sealing ring I (5), pump I (6), container I (7), sealing ring II (8), electromagnet I (9), magnetic sleeve (10), electromagnet II (11), pump II (12), container II (13), sealing ring III (14), pole shoe ring II (15), magnetic fluid II (16), sealing ring IV (17), end cap (18). Detailed Implementation

[0014] The present invention will be further described with reference to the accompanying drawings as specific embodiments:

[0015] A modular variable-temperature magnetic liquid sealing device adaptable to different occasions is characterized in that the sealing device includes: a main shaft (1), magnetic liquid I (2), pole shoe ring I (3), outer shell (4), sealing ring I (5), pump I (6), container I (7), sealing ring II (8), electromagnet I (9), magnetic sleeve (10), electromagnet II (11), pump II (12), container II (13), sealing ring III (14), pole shoe ring II (15), magnetic liquid II (16), sealing ring IV (17), and end cap (18).

[0016] The connection between the various parts of the sealing device is as follows: sealing ring I and sealing ring II are installed in the groove on the outer circular surface of pole shoe ring I to form a left pole shoe ring with sealing rings; sealing ring III and sealing ring IV are installed in the groove on the outer circular surface of pole shoe ring II to form a right pole shoe ring with sealing rings.

[0017] Electromagnet I is glued to the left end face of the magnetic sleeve, and electromagnet II is glued to the right end face of the magnetic sleeve, forming a magnetic source assembly with electromagnets; pump I and pump II are installed on the outer shell by threaded connection; container I is threaded to pump I; container II is threaded to pump II.

[0018] The left pole shoe ring with a sealing ring, the magnetic source assembly with an electromagnet, and the right pole shoe ring with a sealing ring are sequentially installed into the housing. The right side is screwed into the housing through the end cap thread to press the right pole shoe ring, so that the left pole shoe ring with a sealing ring, the magnetic source assembly with an electromagnet, and the right pole shoe ring with a sealing ring can be in close contact. The left pole shoe ring with a sealing ring and the right pole shoe ring with a sealing ring are in close contact with the inner circular surface of the housing to form a seal. Sufficient magnetic fluid is injected between the main shaft and the upper pole teeth of the left and right pole shoe rings to form a magnetic fluid seal.

[0019] Magnetic Liquid I and Magnetic Liquid II use different base fluids. When the applicable temperature of Magnetic Liquid I meets the current operating temperature but the applicable temperature of Magnetic Liquid II does not, Electromagnet I operates, Pump I does not operate, and Magnetic Liquid I is adsorbed onto the pole teeth of the left pole shoe ring to form a magnetic liquid seal. Electromagnet II does not operate, Pump II operates, generating negative pressure to draw Magnetic Liquid II into the container through the corresponding through holes on the right pole shoe ring and the outer shell, preventing temperature-related failure of Magnetic Liquid II. When the applicable temperature of Magnetic Liquid II meets the current operating temperature but the applicable temperature of Magnetic Liquid I does not, Electromagnet II operates, Pump II does not operate, and Magnetic Liquid II is adsorbed onto the pole teeth of the right pole shoe ring to form a magnetic liquid seal. Electromagnet I does not operate, Pump I operates, creating a pressure difference to draw Magnetic Liquid I into the container through the corresponding through holes on the left pole shoe ring and the outer shell, preventing temperature-related failure of Magnetic Liquid I.

[0020] The following describes the composition of the magnetic circuit: The magnetic field emitted by the N pole of electromagnet I passes through the left pole shoe ring, magnetic fluid, and magnetic sleeve to the S pole of electromagnet I; the magnetic field emitted by the N pole of electromagnet II passes through the right pole shoe ring, magnetic fluid, and magnetic sleeve to the S pole of electromagnet II.

[0021] The magnetic circuit is based solely on the magnetic pole directions of electromagnets I and II shown in the attached diagram.

[0022] The outer casing and end caps of the device are all made of 304 stainless steel.

[0023] The left pole shoe ring, magnetic sleeve, and right pole shoe ring are all made of 2Cr13.

[0024] The type of magnetic fluid is selected based on the different application environments and sealing media, using different base liquids.

Claims

1. A modular, temperature-adaptive magnetic liquid sealing device, characterized in that, The sealing device includes a main shaft (1), magnetic fluid I (2), pole shoe ring I (3), outer shell (4), sealing ring I (5), pump I (6), container I (7), sealing ring II (8), electromagnet I (9), magnetic sleeve (10), electromagnet II (11), pump II (12), container II (13), sealing ring III (14), pole shoe ring II (15), magnetic fluid II (16), sealing ring IV (17), and end cap (18); the sealing device is modular. The connection between the various parts of the sealing device is as follows: the sealing ring I and the sealing ring II are installed in the groove on the outer circular surface of the pole shoe ring I to form the left pole shoe ring with sealing rings; the sealing ring III and the sealing ring IV are installed in the groove on the outer circular surface of the pole shoe ring II to form the right pole shoe ring with sealing rings. Electromagnet I is glued to the left end face of the magnetic sleeve, and electromagnet II is glued to the right end face of the magnetic sleeve, forming a magnetic source assembly with electromagnets; pump I and pump II are installed on the outer shell by threaded connection; container I is threaded to pump I; container II is threaded to pump II. The left pole shoe ring with a sealing ring, the magnetic source assembly with an electromagnet, and the right pole shoe ring with a sealing ring are sequentially installed into the housing. The right side is screwed into the housing through the end cap thread to press the right pole shoe ring, ensuring that the left pole shoe ring with a sealing ring, the magnetic source assembly with an electromagnet, and the right pole shoe ring with a sealing ring are in close contact. The left and right pole shoe rings with sealing rings are in close contact with the inner circular surface of the housing to form a seal. Sufficient magnetic fluid is injected between the spindle and the upper pole teeth of the left and right pole shoe rings to form a magnetic fluid seal. There is a gap between the magnetic sleeve and the spindle, but it is not filled with magnetic fluid. The effective temperature range of the magnetic fluid between the upper pole teeth of the left pole shoe ring and the main shaft is different from that of the magnetic fluid between the upper pole teeth of the right pole shoe ring and the main shaft. When the applicable temperature of magnetic liquid I meets the current operating temperature but the applicable temperature of magnetic liquid II does not, electromagnet I operates, pump I does not operate, and magnetic liquid I is adsorbed onto the pole teeth of the left pole shoe ring to form a magnetic liquid seal. Electromagnet II does not operate, pump II operates, generating negative pressure to draw magnetic liquid II into container II through the corresponding through holes on the right pole shoe ring and the outer shell, preventing magnetic liquid II from failing due to temperature issues. When the applicable temperature of magnetic liquid II meets the current operating temperature but the applicable temperature of magnetic liquid I does not, electromagnet II operates, pump II does not operate, and magnetic liquid II is adsorbed onto the pole teeth of the right pole shoe ring to form a magnetic liquid seal. Electromagnet I does not operate, pump I operates, creating a pressure difference to draw magnetic liquid I into container I through the corresponding through holes on the left pole shoe ring and the outer shell, preventing magnetic liquid I from failing due to temperature issues. When electromagnets I and II are energized simultaneously, the magnetic poles generated are in opposite directions.

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