Universal testing device for linear dynamic leak rate of magnetofluid

Abstract

The utility model discloses a magnetic fluid linear dynamic leak rate general testing device, and particularly relates to the magnetic fluid testing field, comprising a fixed substrate, the upper end of the fixed substrate is fixedly provided with a right-angle support, the upper end of the right-angle support is fixedly provided with a driving motor, the output shaft of the driving motor is fixedly connected with a gearbox, and the gearbox is fixedly connected with a motor. The output end of the gearbox is fixedly connected with a chuck, a linear guide rail is installed at the upper end of the fixed base plate, an electric sliding block is arranged on the linear guide rail, a cavity support is fixedly arranged at the upper end of the electric sliding block, and a transition cavity is fixedly arranged at the upper end of the cavity support. One end of the transition cavity is connected with a helium leak detector through an adapter flange. According to the utility model, one side of the transition cavity is connected with the high-precision helium leak detector through the adapter flange under the driving of the speed-adjustable rotation of the driving motor, so that the vacuum state of the magnetic fluid in the rotation state is realized, the leak rate detection is carried out in the rotation state, and the detection precision is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnetic fluid test technical field, concretely is a kind of magnetic fluid linear dynamic leakage rate general testing device. BACKGROUND

[0002] Sealing is to prevent fluid from adjacent joint surface leakage and prevent foreign matter from invading the internal components of machine equipment, magnetic fluid sealing device is filled with magnetic fluid in the space set, permanent magnet, magnetic pole plate, magnetic fluid and rotating shaft form magnetic circuit, under the magnetic field generated by magnet, magnetic fluid appears magnetization and combines the gap channel of surface and reaches the purpose of sealing.Magnetic fluid sealing has the characteristics of long service life, no wear and tear and low leakage rate, working condition from low speed to high speed, from low pressure to high pressure, from room temperature to high temperature, can meet the requirements of various equipment.Magnetic fluid needs to carry out leakage rate detection before use, and can be used after testing qualified.

[0003] At present, the detection of the leakage rate of the product of the domestic magnetic fluid manufacturer is mostly based on the process simplification and cost consideration, and direct vacuum extraction is usually used for static test, but magnetic fluid is a rotating sealing element, and static non-rotation cannot accurately reflect the use state of the product. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of magnetic fluid linear dynamic leakage rate general testing device to solve the problems in prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A kind of magnetic fluid linear dynamic leakage rate general testing device, including fixed base plate, the upper end of the fixed base plate is fixedly arranged with right-angle support, the upper end of the right-angle support is fixedly installed with drive motor, the output shaft of the drive motor is fixedly connected with gearbox, the output end of the gearbox is fixedly connected with chuck, the upper end of the fixed base plate is installed with linear guide rail, electric sliding block is provided on the linear guide rail, electric sliding block upper end fixedly arranged with cavity support, the upper end of the cavity support is fixedly arranged with transition cavity, one end of the transition cavity is connected with helium leak detector by adapter flange.

[0007] In a preferred embodiment, a mounting cavity is provided at the center of the chuck. Multiple arc-shaped clamping plates are arranged inside the mounting cavity. A steel wire rope is attached to the outer end of each arc-shaped clamping plate. The end of the steel wire rope away from the arc-shaped clamping plate is attached to a movable plate. The movable plate is slidably disposed inside the mounting cavity. A first spring is fixedly attached to one end of the movable plate, and a second spring is fixedly attached to the upper end of the arc-shaped clamping plate. A guide rod is slidably disposed on the outer side of the arc-shaped clamping plate. After the end of the magnetic fluid workpiece is inserted into the mounting cavity, it can push the movable plate to move. When the movable plate moves, it releases the steel wire rope. After the arc-shaped clamping plate loses the restraining effect of the steel wire rope, it is clamped at the end of the magnetic fluid workpiece under the action of the second spring, thus clamping the magnetic fluid workpiece and facilitating the rotation of the end of the magnetic fluid workpiece. The guide rod ensures that the arc-shaped clamping plate can only move in a certain direction.

[0008] In a preferred embodiment, guide wheels are provided inside the mounting cavity and inside the chuck sidewall. The wire rope passes through the guide wheels to connect the arc-shaped clamping plate and the moving plate. The guide wheels facilitate the connection between the arc-shaped clamping plate and the moving plate by the wire rope, and play a role in changing direction and guiding.

[0009] In a preferred embodiment, an anti-slip pad is provided on the inner sidewall of the arc-shaped clamping plate, and the elastic force of the first spring is greater than the sum of the elastic forces of the multiple second springs. The anti-slip pad enables the arc-shaped clamping plate to dampen and limit the end of the magnetic fluid workpiece.

[0010] In a preferred embodiment, the movable plate is circular, and a limiting slider is fixedly provided on the outer side wall of the movable plate. The side wall of the mounting cavity is provided with a limiting groove for the limiting slider to move. The setting of the limiting slider and the limiting groove can make the movable plate more stable when moving.

[0011] In a preferred embodiment, limit seats are provided at both ends of the linear guide rail on the fixed base plate, and a sealing gasket is provided on one side wall of the transition cavity. The limit seats can limit the sliding of the electric slider, and the sealing gasket can improve the sealing performance at the connection between the magnetohydrodynamic workpiece and the transition cavity.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model incorporates a drive motor, gearbox, chuck, transition cavity, helium leak detector, and electric slider. The magnetofluid workpiece is installed between the chuck and the transition cavity, and is driven by the adjustable speed rotation of the drive motor. One side of the transition cavity is connected to a high-precision helium leak detector via an adapter flange, thereby achieving a vacuum state in the rotating state of the magnetofluid. Leakage rate detection is performed in the rotating state, resulting in higher detection accuracy.

[0014] This invention incorporates an arc-shaped clamping plate, a movable plate, a steel wire rope, a first spring, and a second spring within the chuck. The movable plate is propelled by the rotating shaft at the end of the magnetic fluid workpiece. As the movable plate moves, the steel wire rope is released, and the arc-shaped clamping plate moves inward under the action of the second spring. The arc-shaped clamping plate then contacts the rotating shaft at the end of the magnetic fluid workpiece, thus clamping and fixing the magnetic fluid workpiece and facilitating its positioning. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the chuck of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal transmission structure of the chuck of this utility model;

[0018] Figure 4 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0019] The following are the labels in the diagram: 1. Fixed base plate; 2. Right-angle bracket; 3. Drive motor; 4. Gearbox; 5. Chuck; 6. Linear guide rail; 7. Electric slider; 8. Cavity support; 9. Transition cavity; 10. Adapter flange; 11. Helium leak detector; 12. Mounting cavity; 13. Arc-shaped clamping plate; 14. Steel wire rope; 15. Moving plate; 16. First spring; 17. Second spring; 18. Guide wheel; 19. Limit slider; 20. Guide rod; 21. Limit seat; 22. Magnetofluid workpiece. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example: Please refer to Figures 1-4 This utility model provides a universal testing device for linear dynamic leakage rate of magnetohydrodynamic fluids, and the technical solution is as follows:

[0022] A universal testing device for linear dynamic leakage rate of magnetohydrodynamics includes a fixed base plate 1, a right-angle bracket 2 fixedly mounted on the upper end of the fixed base plate 1, a drive motor 3 fixedly mounted on the upper end of the right-angle bracket 2, a gearbox 4 fixedly connected to the output shaft of the drive motor 3, a chuck 5 fixedly connected to the output end of the gearbox 4, a linear guide rail 6 mounted on the upper end of the fixed base plate 1, an electric slider 7 mounted on the linear guide rail 6, a cavity support 8 fixedly mounted on the upper end of the electric slider 7, a transition cavity 9 fixedly mounted on the upper end of the cavity support 8, and a helium leak detector 11 connected to one end of the transition cavity 9 via an adapter flange 10.

[0023] In a preferred embodiment, a mounting cavity 12 is provided at the center of the chuck 5. Multiple arc-shaped clamping plates 13 are provided inside the mounting cavity 12. A steel wire rope 14 is provided at the outer end of the arc-shaped clamping plate 13. The end of the steel wire rope 14 away from the arc-shaped clamping plate 13 is provided on a moving plate 15. The moving plate 15 is slidably disposed inside the mounting cavity 12. A first spring 16 is fixedly provided at one end of the moving plate 15. A second spring 17 is fixedly provided at the upper end of the arc-shaped clamping plate 13. A guide rod 20 is slidably disposed on the outer side of the arc-shaped clamping plate 13. When the moving plate 15 moves to the left, the steel wire rope 14 on the side of the arc-shaped clamping plate 13 is released, and the arc-shaped clamping plate 13 contacts the magnetohydrodynamic workpiece 22 under the action of the second spring 17.

[0024] In a preferred embodiment, guide wheels 18 are provided inside the mounting cavity 12 and inside the side wall of the chuck 5. The wire rope 14 passes through the guide wheels 18 to connect the arc-shaped clamping plate 13 and the moving plate 15. The guide wheels 18 facilitate the change of direction of the wire rope 14.

[0025] In a preferred embodiment, an anti-slip pad is provided on the inner sidewall of the arc-shaped clamping plate 13. The elastic force of the first spring 16 is greater than the sum of the elastic forces of the multiple second springs 17. The anti-slip pad provides better damping between the arc-shaped clamping plate 13 and the rotation axis at the end of the magnetic fluid workpiece 22. The larger elastic force of the first spring 16 can prevent the rotation axis at the end of the magnetic fluid workpiece 22 from touching the arc-shaped clamping plate 13 when it is inserted into the mounting cavity 12.

[0026] In a preferred embodiment, the movable plate 15 is circular, and a limiting slider 19 is fixedly provided on the outer side wall of the movable plate 15. The side wall of the mounting cavity 12 is provided with a limiting groove for the limiting slider 19 to move. The limiting slider 19 and the limiting groove can guide the movable plate 15.

[0027] In a preferred embodiment, a limiting seat 21 is provided at both ends of the linear guide rail 6 on the fixed base plate 1, and a sealing gasket is provided on one side wall of the transition cavity 9.

[0028] The working principle of this utility model:

[0029] In use, one end of the magnetohydrodynamic (MHD) workpiece 22 to be tested is fixed to one end of the transition cavity 9. The rotation shaft of one end of the MHD workpiece 22 enters the interior of the transition cavity 9. After the MHD workpiece 22 is fixed, the electric slider 7 is opened. The electric slider 7 drives the cavity support 8, the transition cavity 9, and the MHD workpiece 22 to move to one side of the chuck 5. The rotation shaft of one end of the MHD workpiece 22 enters the mounting cavity 12 at one end of the chuck 5. As the MHD workpiece 22 is inserted, the rotation shaft contacts the moving plate 15 and pushes the moving plate 15 to the left. When the moving plate 15 moves to the left, the wire rope 14 is released, and the arc-shaped clamping mechanism is activated. When plate 13 loses the pulling force of wire rope 14, it moves towards the direction of rotation axis under the action of second spring 17. When the magnetohydrodynamic workpiece 22 moves to a certain position to the left, the arc-shaped clamping plate 13 clamps the rotation axis and sprays helium gas onto the ATM side of the magnetohydrodynamic workpiece 22. Then, the drive motor 3 is turned on. After the speed is adjusted by gearbox 4, the drive motor 3 drives the chuck 5 to rotate. When the chuck 5 rotates, it can make the rotation axis on the magnetohydrodynamic workpiece 22 rotate. The leak rate of the magnetohydrodynamic workpiece 22 is detected by helium leak detector 11. The change of the leak rate value of helium detector is observed to determine whether the workpiece has a leak. The leak rate is qualified if it is within the standard range (≤1*10-9 / Atm.cc / s).

[0030] After the test is completed, the electric slider 7 drives the cavity support 8, the transition cavity 9 and the magnetic fluid workpiece 22 to rotate in the opposite direction, and the rotating shaft is pulled out from the installation cavity 12. When the rotating shaft is pulled out, the moving plate 15 moves in the opposite direction under the action of the first spring 16. When the moving plate 15 moves, it can pull the arc-shaped clamping plate 13 away from the rotating shaft through the steel wire rope 14. Then the magnetic fluid workpiece 22 can be removed from the transition cavity 9.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A universal testing device for linear dynamic leakage rate of magnetohydrodynamic fluid, comprising a fixed substrate (1), characterized in that: A right-angle bracket (2) is fixedly installed on the upper end of the fixed base plate (1). A drive motor (3) is fixedly installed on the upper end of the right-angle bracket (2). A gearbox (4) is fixedly connected to the output shaft of the drive motor (3). A chuck (5) is fixedly connected to the output end of the gearbox (4). A linear guide rail (6) is installed on the upper end of the fixed base plate (1). An electric slider (7) is installed on the linear guide rail (6). A cavity support (8) is fixedly installed on the upper end of the electric slider (7). A transition cavity (9) is fixedly installed on the upper end of the cavity support (8). A helium leak detector (11) is connected to one end of the transition cavity (9) through a transition flange (10).

2. The universal testing device for linear dynamic leakage rate of magnetohydrodynamic fluid according to claim 1, characterized in that: The chuck (5) has a mounting cavity (12) at its center. Multiple arc-shaped clamping plates (13) are provided inside the mounting cavity (12). A steel wire rope (14) is provided at the outer end of the arc-shaped clamping plate (13). The end of the steel wire rope (14) away from the arc-shaped clamping plate (13) is provided on a moving plate (15). The moving plate (15) is slidably provided inside the mounting cavity (12). A first spring (16) is fixedly provided at one end of the moving plate (15). A second spring (17) is fixedly provided at the upper end of the arc-shaped clamping plate (13). A guide rod (20) is slidably provided on the outer side of the arc-shaped clamping plate (13).

3. The universal testing device for linear dynamic leakage rate of magnetohydrodynamic fluid according to claim 2, characterized in that: Guide wheels (18) are provided inside the mounting cavity (12) and inside the side wall of the chuck (5). The wire rope (14) passes through the guide wheels (18) to connect the arc-shaped clamping plate (13) and the moving plate (15).

4. The universal testing device for linear dynamic leakage rate of magnetohydrodynamic fluid according to claim 2, characterized in that: The inner wall of the arc-shaped clamping plate (13) is provided with an anti-slip pad, and the elastic force of the first spring (16) is greater than the sum of the elastic forces of the multiple second springs (17).

5. The universal testing device for linear dynamic leakage rate of magnetohydrodynamic fluid according to claim 2, characterized in that: The movable plate (15) is circular in shape, and a limiting slider (19) is fixedly provided on the outer side wall of the movable plate (15). The side wall of the mounting cavity (12) is provided with a limiting groove for the limiting slider (19) to move.

6. The universal testing device for linear dynamic leakage rate of magnetohydrodynamic fluid according to claim 1, characterized in that: Limit seats (21) are provided at both ends of the linear guide rail (6) on the fixed base plate (1), and a sealing gasket is provided on one side wall of the transition cavity (9).

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