Leakage-proof circulating fan in loop type high-pressure gas flow calibrating device

Abstract

The invention discloses an anti-leakage circulating fan in a loop type high-pressure gas flow calibrating device. A magnetic coupling coupler comprises an outer rotor, an inner rotor, a high-pressure isolation hood and a first flange plate; a containing groove is formed in the end portion of the outer rotor, the end portion of the inner rotor is arranged in the containing groove of the outer rotor, a plurality of magnets with N poles and S poles arranged at intervals are evenly arranged on the inner wall of the containing groove and the periphery of the inner rotor in the circumferential direction respectively, the number of the magnets on the outer rotor and the number of the magnets on the inner rotor are equal, and the magnetic poles at the radial opposite positions are opposite. And the high-voltage isolation hood is a thin-wall shell with a closed top, is arranged between the outer rotor and the inner rotor, and is not in contact with the outer rotor and the inner rotor. By changing the transmission form and the sealing form, the safety of the system is remarkably improved, the maintenance difficulty and cost are effectively reduced, the working efficiency is improved, and the device has important significance for promoting the development of a clean energy technology.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and particularly to a leak-proof circulating fan in an annular channel type high-pressure gas flow calibration device. Background Art

[0002] Currently, the circulating fans applied in high-pressure gas flow calibration devices still use conventional industrial fans. The connection mode between the impeller and the motor of this kind of fan is mechanical connection, and there are the following disadvantages: 1. Low safety. In the calibration of high-pressure gases, the pressure of the gas to be detected is usually greater than 1 MPa, and some gases to be detected are also flammable and explosive gases, such as hydrogen, natural gas or hydrogen-doped natural gas. It is very difficult to ensure zero leakage of gas under high-pressure conditions by mechanical sealing, which increases the potential safety hazards of the calibration work; 2. Difficult to maintain and high cost. The weak points of traditional fans in terms of sealing mainly focus on the seal between the impeller shaft and the volute. It is very difficult to ensure its seal during the high-speed rotation of the impeller. Moreover, high-speed rotation will exacerbate the aging and wear of the seal. After using for a period of time, the seal needs to be replaced. Frequent disassembly and assembly of the impeller not only have cumbersome procedures, but also easily cause the failure of other sealing parts; 3. Small flow range. Since the sealing method of traditional fans cannot ensure zero leakage of high-pressure gases, in actual calibration work, only the method of reducing the speed and increasing the size of the impeller blades can be chosen as a second best to ensure that the flow requirements for the calibration work are met. However, the too large impeller size results in that the impeller cannot be disassembled alone, and the motor, coupling and impeller must be disconnected, and then the volute must be disassembled to take out the impeller for seal replacement, which further increases the overall maintenance difficulty.

[0003] Therefore, how to create a new leak-proof circulating fan in an annular channel type high-pressure gas flow calibration device is one of the important research and development topics at present. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a leak-proof circulating fan in an annular channel type high-pressure gas flow calibration device, so as to fundamentally solve the problem of easy leakage caused by traditional mechanical sealing, improve safety, reduce the maintenance difficulty and cost, and expand the flow range of the fan by increasing the speed and reducing the impeller size, thereby overcoming the deficiencies of the prior art.

[0005] To solve the above technical problem, the present invention provides a leak-proof circulating fan in an annular channel type high-pressure gas flow calibration device, including a high-speed motor, a magnetic coupling, a fan impeller, a bearing assembly and a fan volute; The fan impeller is installed in the fan volute through the bearing assembly. The rotating shaft of the fan impeller extends out of the fan volute and is in transmission connection with the output shaft of the high-speed motor through the magnetic coupling; The magnetic coupling includes an outer rotor, an inner rotor, a high-voltage isolation cover, and a first flange; A receiving groove is formed at the end of the outer rotor. The end of the inner rotor is placed in the receiving groove of the outer rotor. A plurality of magnets with N poles and S poles arranged at intervals are circumferentially and evenly arranged on the inner wall of the receiving groove and the outer periphery of the inner rotor respectively, so that the number of magnets on the outer rotor and the inner rotor is equal, and the magnetic poles are opposite at the radially opposite positions; The high-voltage isolation cover is a thin-walled shell with a closed top, which is placed between the outer rotor and the inner rotor and does not contact the outer rotor and the inner rotor. The root of the high-voltage isolation cover is fixedly connected to the first flange and is connected to the outer end face of the bearing assembly by bolts.

[0006] As an improvement of the present invention, the top of the high-voltage isolation cover is in a conical pointed shape or a flat top shape, and the bottom of the receiving groove conforms to the top of the high-voltage isolation cover.

[0007] Further, the magnets on the inner rotor are connected to the inner rotor through a second flange and bolts.

[0008] Further, the bearing assembly includes a bearing housing and a high-speed bearing. A stepped mounting hole for mounting the bearing assembly is formed on the back of the blower volute. A flange is provided at the outer end of the bearing housing and is connected to the mounting hole by bolts. The rotating shaft of the blower impeller is installed on the bearing housing through the high-speed bearing, and the diameter of the blower impeller is smaller than the diameter of the bearing housing, so that the blower impeller can be installed or disassembled from the back of the blower volute together with the bearing assembly.

[0009] Further, a rotational speed sensor and a bearing temperature sensor are installed on the bearing assembly for monitoring the rotational speed of the blower impeller and the bearing temperature.

[0010] Further, the blower volute includes an air inlet assembly and an air outlet assembly. The air inlet assembly and the air outlet assembly are axially aligned and connected by bolts. Annular semi-circular flow channels are machined on the opposite end faces of the air inlet assembly and the air outlet assembly. After being assembled, a circular flow channel is formed. The air inlet is arranged at the front end of the air inlet assembly in the axial direction, and the air outlet is arranged at the upper end of the air outlet assembly.

[0011] Further, the high-speed motor is installed on an adjustable base, and slide rails are provided on the adjustable base for adjusting the horizontal position and vertical height of the high-speed motor.

[0012] Further, the material of the magnets is neodymium iron boron or samarium cobalt; Further, the material of the high-voltage isolation cover is a non-metallic composite material.

[0013] Further, the material of the high-voltage isolation cover is a carbon fiber composite material.

[0014] After adopting such a design, the present invention has at least the following advantages: 1. By providing a magnetic coupling coupling, the present invention enables the impeller rotating shaft and the motor output shaft to transmit torque through a magnetic field, avoiding direct physical contact, and providing a high-pressure isolation cover to form a closed cavity, converting the original dynamic seal into a static seal, effectively improving the sealing performance and safety, and achieving zero leakage of the high-pressure gas to be calibrated; 2. The top of the high-pressure isolation cover is in a conical pointed shape, and the bottom of the accommodating groove of the moving rotor conforms to the top of the high-pressure isolation cover, which is more convenient for positioning during the installation process; 3. Due to the change in the sealing method and the improvement in the sealing performance, the high-speed motor can be set to a higher speed, and the shape of the impeller can be numerically simulated and optimized through computational fluid dynamics (CFD) software, so that the impeller diameter is smaller than the bearing assembly size, thereby realizing the separate removal of the impeller and the bearing assembly without disassembling the volute, reducing the maintenance difficulty, improving the work efficiency, and also avoiding the possible end face damage during the disassembly of the volute; 4. The bearing assembly is equipped with a bearing temperature sensor and a rotational speed sensor, which can monitor the bearing temperature and the impeller rotational speed in real time, and issue an alarm when the preset value is reached to prevent accidents. Description of the Drawings

[0015] The above is only an overview of the technical solution of the present invention. In order to be able to more clearly understand the technical means of the present invention, the following further detailed description of the present invention will be given in conjunction with the drawings and specific embodiments.

[0016] Figure 1 is a schematic structural diagram of the present invention.

[0017] Figure 2 is a schematic structural diagram of the magnetic coupling coupling in the present invention.

[0018] Figure 3 is a schematic structural diagram of the bearing assembly in the present invention.

[0019] Description of the reference numerals: 1. High-speed motor; 2. Magnetic coupling coupling; 3. Fan impeller; 4. Intake assembly; 5. Bearing assembly; 6. Exhaust assembly; 7. Adjustable base; 8. Outer rotor; 9. High-pressure isolation cover; 10. First flange; 11. Inner rotor; 12. Magnet; 13. Second flange; 14. Rotational speed sensor; 15. Bearing temperature sensor; 16. High-speed bearing. Detailed Embodiments

[0020] Please refer to Figures 1 to 3 , the present invention provides an anti-leakage circulating fan in a loop-type high-pressure gas flow calibration device, including a high-speed motor 1, a magnetic coupling coupling 2, a fan impeller 3, a fan volute, and a bearing assembly 5.

[0021] The high-speed motor 1 is installed on the adjustable base 7. The adjustable base 7 is provided with slide rails for adjusting the horizontal position and vertical height of the high-speed motor 1, which is convenient for adjusting the high-speed motor 1 during initial installation and also enables the high-speed motor 1 to move backward horizontally during subsequent maintenance, leaving space for removing the fan impeller 3.

[0022] The magnetic coupling 2 is used for non-contact power transmission between the output shaft of the high-speed motor 1 and the rotating shaft of the fan impeller 3.

[0023] The magnetic coupling 2 includes an inner rotor 8, a high-voltage isolation cover 9, a first flange 10, an outer rotor 11, magnets 12, and a second flange 13.

[0024] One end of the outer rotor 11 is connected to the output shaft of the high-speed motor 1, and a receiving groove is formed at the other end. A plurality of magnets 12 are evenly arranged along the circumferential direction of the inner wall of the receiving groove, and the magnets 12 are arranged at intervals of N poles and S poles.

[0025] One end of the inner rotor 8 is connected to the rotating shaft of the fan impeller 3, and the other end is placed in the receiving groove of the outer rotor 11. A plurality of magnets 12 with N poles and S poles arranged at intervals are also evenly arranged along the circumferential direction of the outer periphery of the inner rotor 8. The number of magnets 12 on the inner rotor 8 and the outer rotor 11 is the same, but at the radially opposite positions, the magnets 12 on the inner rotor 8 and the outer rotor 11 have opposite magnetic poles. In this embodiment, the magnets 12 on the outer rotor 11 are integrated on the inner wall of the receiving groove, while the magnets 12 on the inner rotor 8 are installed on the outer periphery of the inner rotor 8 through the second flange 13 and bolts. The material of the magnets 12 is neodymium iron boron or samarium cobalt. The high-voltage isolation cover 9 is a thin-walled shell with a closed top, which is placed between the outer rotor 11 and the inner rotor 8, that is, the high-voltage isolation cover 9 is sleeved outside the inner rotor 8 and is placed in the receiving groove of the outer rotor 11 together with the inner rotor 8, but the high-voltage isolation cover 9 is not in contact with the inner rotor 8 and the outer rotor 11.

[0026] The root of the high-voltage isolation cover 9 is fixedly connected to the first flange 10, and the first flange 10 is connected to the outer end face of the bearing assembly 5 through bolts. The first flange 10 can be customized into a grooved flange, that is, there is an annular groove on the contact surface between the first flange 10 and the bearing assembly 5, and sealing is achieved after installing an O-ring.

[0027] In this embodiment, the top of the high-voltage isolation cover 9 is in the shape of a conical spire, and the bottom of the receiving groove on the outer rotor 11 is conformable to the top of the high-voltage isolation cover 9, that is, it is in an inner conical shape and slightly larger than the top of the high-voltage isolation cover 9. The advantage of this setting is that it is convenient for accurate positioning during installation. In other embodiments, on the premise that the user's installation site itself has the ability of accurate positioning, the top of the high-voltage isolation cover 9 can also be made into a flat top shape, and the bottom of the receiving groove is conformable to it.

[0028] The function of the high-voltage isolation cover 9 is to form a sealed cavity, convert the original dynamic seal into a static seal, and improve the overall sealing performance. The high-voltage isolation cover 9 is made of a non-metallic composite material, which is a carbon fiber composite material in this embodiment and can also be other non-metallic composite materials in other embodiments. Its characteristics are that it not only has high strength and stable connection by itself, does not affect the magnetic coupling transmission between the outer rotor 11 and the inner rotor 8, but also will not generate heat due to the magnetic eddy current effect.

[0029] In this embodiment, the fan volute is a split volute, including an air inlet component 4 and an air outlet component 6. The air inlet component 4 and the air outlet component 6 are axially aligned and connected into an integral body by high-strength bolts, and an O-ring is installed on the connection surface to ensure sealing. The opposite end faces of the air inlet component 4 and the air outlet component 6 are both machined with annular semi-circular flow channels, and a complete circular flow channel inside the volute is formed after they are assembled. Both the air inlet component 4 and the air outlet component 6 are castings, and are machined and polished by a milling machine after molding.

[0030] The air inlet is located at the front end of the axis of the air inlet component 4, and the air outlet is located at the upper end of the air outlet component 5. Flanges are provided at both the air inlet and the air outlet. The flanges are designed according to the medium pressure grade, manufactured by welding or casting, and the structure is optimized using advanced computational fluid dynamics (CFD) software.

[0031] The fan impeller 3 is installed in the fan volute through the bearing assembly 5. Specifically in this embodiment, the fan impeller 3 and the bearing assembly 5 are installed on the air outlet component 6. The impeller body is located inside the fan volute, and the rotating shaft extends outside the air outlet component 6.

[0032] The bearing assembly 5 includes a bearing seat, a high-speed bearing 16, a rotational speed sensor 14, and a bearing temperature sensor 15.

[0033] A stepped mounting hole penetrating through to the internal flow channel of the volute is opened on the back of the air outlet component 6 of the fan volute. The outer end of the bearing seat is provided with a flange, and the dimensions at the flange are matched with the dimensions of the stepped mounting hole, so that the bearing seat is placed in the mounting hole and fixed by bolt connection. An O-ring can be added between the flange and the stepped mounting hole to achieve sealing.

[0034] The rotating shaft of the fan impeller 3 is installed on the bearing seat through the high-speed bearing 16. The diameter of the fan impeller 3 is smaller than the diameter of the bearing seat, so that the fan impeller 3 can be taken out together with the bearing assembly 5 from the mounting hole.

[0035] It should be noted that due to the change in the transmission form and the sealing form, the problem of high-pressure gas leakage is solved. Without the concern of leakage, the high-speed motor 1 can be set to a higher speed, so that the size of the fan impeller 3 can be reduced. After numerically simulating the impeller shape through computational fluid dynamics (CFD) software, its size is reduced to less than the diameter of the bearing assembly 5, so that the fan impeller 3 and the bearing assembly 5 can be removed for maintenance without disassembling the intake assembly 4 and the exhaust assembly 6.

[0036] The rotation speed sensor 14 and the bearing temperature sensor 15 are both installed on the bearing housing, and are respectively used to monitor the rotation speed of the fan impeller and the bearing temperature. When the preset value is reached, an alarm signal is sent to prevent accidents.

[0037] By changing the transmission form and the sealing form, the present invention not only significantly improves the safety of the system, but also effectively reduces the maintenance difficulty and cost and improves the work efficiency, which is of great significance for promoting the development of clean energy technology.

[0038] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any simple modifications, equivalent changes or decorations made by those skilled in the art using the disclosed technical content all fall within the protection scope of the present invention.

Claims

1. An anti-leakage circulation fan in a loop-type high-pressure gas flow calibration device, characterized in that, It includes a high-speed motor, a magnetic coupling, a fan impeller, a bearing assembly and a fan volute. The fan impeller is installed in the fan volute through the bearing assembly. The rotating shaft of the fan impeller extends outside the fan volute and is drivingly connected to the output shaft of the high-speed motor through the magnetic coupling. The magnetic coupling includes an outer rotor, an inner rotor, a high-voltage isolation cover and a first flange. A receiving groove is formed at the end of the outer rotor. The end of the inner rotor is placed in the receiving groove of the outer rotor. A plurality of magnets with N poles and S poles arranged at intervals are circumferentially and uniformly arranged on the inner wall of the receiving groove and the outer periphery of the inner rotor respectively, so that the number of magnets on the outer rotor and the inner rotor is equal, and the magnetic poles are opposite at the radially opposite positions. The high-voltage isolation cover is a thin-walled shell with a closed top. It is placed between the outer rotor and the inner rotor and is not in contact with the outer rotor and the inner rotor. The root of the high-voltage isolation cover is fixedly connected to the first flange and is connected to the outer end face of the bearing assembly through bolts.

2. The anti-leakage circulation fan in a loop-type high-pressure gas flow calibration device according to claim 1, characterized in that, The top of the high-voltage isolation cover is in the shape of a conical pointed top or a flat top, and the bottom of the receiving groove conforms to the top of the high-voltage isolation cover.

3. The anti-leakage circulation fan in a loop-type high-pressure gas flow calibration device according to claim 1, characterized in that, The magnets on the inner rotor are connected to the inner rotor through a second flange and bolts.

4. The anti-leakage circulation fan in a circular high-pressure gas flow calibration device according to claim 1, characterized in that, The bearing assembly includes a bearing housing and a high-speed bearing. A stepped mounting hole for installing the bearing assembly is formed on the back of the fan volute. A flange is provided at the outer end of the bearing housing and is connected to the mounting hole through bolts at the flange. The rotating shaft of the fan impeller is installed on the bearing housing through the high-speed bearing, and the diameter of the fan impeller is smaller than the diameter of the bearing housing, so that the fan impeller can be installed or disassembled from the back of the fan volute together with the bearing assembly.

5. The anti-leakage circulation fan in a loop-type high-pressure gas flow calibration device according to claim 4, characterized in that, A speed sensor and a bearing temperature sensor are installed on the bearing assembly to monitor the speed of the fan impeller and the bearing temperature.

6. The anti-leakage circulation fan in a loop-type high-pressure gas flow calibration device according to claim 1, characterized in that, The fan volute includes an air inlet assembly and an air outlet assembly. The air inlet assembly and the air outlet assembly are axially aligned and connected by bolts. Annular semi-circular flow channels are machined on the opposite end faces of the air inlet assembly and the air outlet assembly. After being installed in an aligned manner, a circular flow channel is formed. The air inlet is arranged at the front end of the air inlet assembly in the axial direction, and the air outlet is arranged at the upper end of the air outlet assembly.

7. The anti-leakage circulation fan in a circular-channel high-pressure gas flow calibration device according to claim 1, characterized in that, The high-speed motor is installed on an adjustable base, and a slide rail is provided on the adjustable base for adjusting the horizontal position and vertical height of the high-speed motor.

8. The anti-leakage circulation fan in a circular-channel high-pressure gas flow calibration device according to claim 1, characterized in that, The material of the magnet is neodymium iron boron or samarium cobalt.

9. The anti-leakage circulating fan in a circular-channel high-pressure gas flow calibration device according to claim 1, characterized in that, The material of the high-voltage isolation cover is a non-metallic composite material.

10. The anti-leakage circulation fan in a loop-type high-pressure gas flow calibration device according to claim 9, characterized in that, The material of the high-voltage isolation cover is a carbon fiber composite material.

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