Easily-maintained circulating fan in loop type high-pressure gas flow calibrating device

Abstract

The utility model discloses a circulating fan easy to maintain in a loop type high-pressure gas flow calibrating device, a bearing assembly comprises a bearing seat and a high-speed bearing, the back of a fan volute is provided with a stepped mounting hole for mounting the bearing assembly, the outer end of the bearing seat is provided with a flange, the flange is connected with the mounting hole through a bolt, and the bearing assembly is connected with the high-speed bearing through a bolt. A rotating shaft of the fan impeller is installed on the bearing seat through a high-speed bearing, and the diameter of the fan impeller is smaller than that of the bearing seat, so that the fan impeller and the bearing assembly can be installed or detached from the back face of the fan volute together. The device is exquisite in structure and convenient to operate, the fan impeller and the bearing assembly can be detached for maintenance under the condition that the fan volute is not detached, maintenance difficulty and cost are reduced, maintenance convenience and efficiency are improved, safety is remarkably improved, and zero leakage of high-pressure gas is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field, especially a kind of easy maintenance circulating fan in loop type high-pressure gas flow calibration device. BACKGROUND

[0002] At present, circulating fan applied in high-pressure gas flow calibration device still uses conventional industrial fan, the connecting mode between the impeller and motor of this kind of fan is mechanical connection, and it has the following shortcomings: 1, low safety, in the calibration of high-pressure gas, the pressure of the detected gas is usually greater than 1MPa, and part of the detected gas is flammable and explosive gas, such as hydrogen, natural gas or hydrogen-containing natural gas, and it is difficult to guarantee zero leakage of gas under high pressure by mechanical seal, which increases the safety hazard of calibration work;2, difficult to maintain and high cost, the weakness of traditional fan in sealing mainly concentrates on the sealing between impeller rotating shaft and volute, and it is very difficult to ensure the sealing of impeller in high-speed rotation, and moreover, high-speed rotation can further aggravate the aging and wear of sealing element, so that the sealing element needs to be replaced after a period of use, and frequent disassembly and assembly of impeller not only is cumbersome, but also can cause failure of other sealing parts;3, small flow range, since the sealing mode of traditional fan cannot guarantee zero leakage of high-pressure gas, in actual calibration work, it is only possible to choose to reduce the speed and increase the size of impeller blade to ensure the required flow rate of calibration work, but the large size of impeller blade leads to the fact 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 replacement of sealing element, which further increases the difficulty of overall maintenance.

[0003] Therefore, how to create a new easy maintenance circulating fan in loop type high-pressure gas flow calibration device is one of the important research and development subjects at present. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to provide an easy maintenance circulating fan in loop type high-pressure gas flow calibration device, so as to facilitate the installation and disassembly of fan impeller, reduce the difficulty and cost of maintenance, solve the problem of poor sealing and easy leakage of traditional fan, improve safety, and overcome the shortcomings of prior art.

[0005] To solve the above technical problems, the utility model provides an easy maintenance circulating fan in loop type high-pressure gas flow calibration device, which comprises a high-speed motor, a magnetic coupling coupling, a fan impeller, a bearing assembly and a fan volute.

[0006] 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 drivingly connected with the output shaft of the high-speed motor through the magnetic coupling coupling.

[0007] The bearing assembly comprises a bearing seat and a high-speed bearing, a stepped mounting hole for mounting the bearing assembly is formed on the back of the fan volute, a flange is arranged on the outer end of the bearing seat, and the flange is connected with the mounting hole through bolts, the rotating shaft of the fan impeller is mounted on the bearing seat through the high-speed bearing, and the diameter of the fan impeller is smaller than the diameter of the bearing seat, so that the fan impeller can be mounted or dismounted from the back of the fan volute together with the bearing assembly.

[0008] As an improvement of the utility model, a rotating speed sensor and a bearing temperature sensor are mounted on the bearing assembly to monitor the rotating speed of the fan impeller and the bearing temperature.

[0009] Further, the fan volute comprises an air inlet assembly and an air outlet assembly, the air inlet assembly and the air outlet assembly are axially matched and connected through bolts, and annular semicircular flow channels are formed on the opposite end faces of the air inlet assembly and the air outlet assembly after matched mounting, an air inlet is arranged on the axially front end of the air inlet assembly, and an air outlet is arranged on the upper end of the air outlet assembly.

[0010] Further, the high-speed motor is mounted on an adjustable base, and slide rails are arranged on the adjustable base to adjust the horizontal position and vertical height of the high-speed motor.

[0011] Further, the magnetic coupling shaft coupling comprises an outer rotor, an inner rotor, a high-pressure isolation cover and a first flange plate.

[0012] The end of the outer rotor is provided with a containing groove, the end of the inner rotor is arranged in the containing groove of the outer rotor, and a plurality of N-pole and S-pole interval arranged magnets are respectively arranged on the inner wall of the containing groove and the outer periphery of the inner rotor in a circumferential uniform manner, so that the number of magnets on the outer rotor and the inner rotor is equal, and the magnetic poles are opposite at the diametrically opposite positions.

[0013] The high-pressure isolation cover is a thin-walled shell with a closed top, arranged between the outer rotor and the inner rotor, and not in contact with the outer rotor and the inner rotor, the root of the high-pressure isolation cover is fixedly connected with the first flange plate, and connected with the outer end face of the bearing assembly through bolts.

[0014] Further, the top of the high-pressure isolation cover is in the shape of a tapered pointed top or a flat top, and the groove bottom of the containing groove is conformal to the top of the high-pressure isolation cover.

[0015] Further, the magnets on the inner rotor are connected with the inner rotor through the second flange plate and the bolts.

[0016] Further, the material of the magnets is neodymium iron boron or samarium cobalt.

[0017] Further, the material of the high-pressure isolation cover is a non-metallic composite material.

[0018] Further, the material of the high-pressure isolation cover is a carbon fiber composite material.

[0019] With such design, the utility model has at least the following advantages:

[0020] 1、The fan impeller is installed in the fan volute through the bearing assembly, and the diameter of the fan impeller is smaller than the diameter of the bearing assembly, so that the fan impeller and the bearing assembly can be installed or removed from the back of the fan volute without disassembling the fan volute, thereby improving the maintenance convenience and reducing the maintenance difficulty and cost;

[0021] 2、The magnetic coupling shaft coupling is external, and the high-speed motor can slide horizontally along the slide rail of the adjustable base after being unlocked, and when the fan impeller needs to be maintained, the high-speed motor is slid back to leave space, and after the magnetic coupling shaft coupling is removed, the fan impeller and the bearing assembly can be taken out for maintenance, which is simple and convenient to operate;

[0022] 3、The bearing assembly is provided with a bearing temperature sensor and a rotating speed sensor, which can monitor the bearing temperature and the rotating speed of the impeller in real time, and an alarm is sent when the preset value is reached, thereby preventing accidents;

[0023] 4、The magnetic coupling shaft coupling transmits torque between the impeller shaft and the motor output shaft by using a magnetic field, avoids direct physical contact, and forms a closed cavity by arranging a high-pressure isolation cover, thereby converting the original dynamic seal into a static seal, effectively improving the sealing performance and safety, and realizing zero leakage of the detected high-pressure gas;

[0024] 5、The top of the high-pressure isolation cover is conical, the bottom of the accommodating groove of the rotor is adapted to the top of the high-pressure isolation cover, and positioning is more convenient during installation. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, the utility model will be further described in detail in combination with the drawings and specific embodiments.

[0026] Fig. 1 is a structural schematic view of the utility model.

[0027] Fig. 2 is a structural schematic view of the magnetic coupling shaft coupling in the utility model.

[0028] Fig. 3 is a structural schematic view of the bearing assembly in the utility model.

[0029] Explanation of reference signs: 1, high-speed motor; 2, magnetic coupling shaft coupling; 3, fan impeller; 4, air inlet assembly; 5, bearing assembly; 6, air outlet assembly; 7, adjustable base; 8, outer rotor; 9, high-pressure isolation cover; 10, first flange plate; 11, inner rotor; 12, magnet; 13, second flange plate; 14, rotating speed sensor; 15, bearing temperature sensor; 16, high-speed bearing. DETAILED DESCRIPTION

[0030] Please refer to Figs. 1 to 3 The utility model provides a kind of easy maintenance circulating fan in loop type high-pressure gas flow calibrating device, including high-speed motor 1, magnetic coupling shaft coupling 2, fan impeller 3, fan volute and bearing assembly 5.

[0031] The high-speed motor 1 is installed on the adjustable base 7, and the adjustable base 7 is provided with sliding rails for adjusting the horizontal position and vertical height of the high-speed motor 1. This not only facilitates the adjustment of the high-speed motor 1 during initial installation, but also allows the high-speed motor 1 to retreat horizontally during subsequent maintenance, leaving space for dismounting the fan impeller 3.

[0032] The magnetic coupling shaft 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.

[0033] The magnetic coupling shaft coupling 2 includes an inner rotor 8, a high-pressure isolation cover 9, a first flange plate 10, an outer rotor 11, a magnet 12, and a second flange plate 13.

[0034] One end of the outer rotor 11 is connected to the output shaft of the high-speed motor 1, and the other end has a receiving groove. Multiple magnets 12 are evenly arranged on the inner wall of the receiving groove in the circumferential direction, and the magnets 12 are arranged alternately with N poles and S poles.

[0035] 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. Multiple magnets 12 are also evenly arranged on the outer periphery of the inner rotor 8 in the circumferential direction, and the magnets 12 are arranged alternately with N poles and S poles. The number of magnets 12 on the inner rotor 8 and the outer rotor 11 is the same, but the magnetic poles of the magnets 12 on the inner rotor 8 and the outer rotor 11 are opposite at diametrically opposed positions.

[0036] In this embodiment, the magnets 12 on the outer rotor 11 are integrated on the inner wall of the receiving groove, and the magnets 12 on the inner rotor 8 are installed on the outer periphery of the inner rotor 8 through the second flange plate 13 and bolts. The material of the magnets 12 is neodymium iron boron or samarium cobalt

[0037] The high-pressure isolation cover 9 is a thin-walled shell with a closed top, which is arranged between the outer rotor 11 and the inner rotor 8, that is, the high-pressure isolation cover 9 is sleeved outside the inner rotor 8 and is arranged in the accommodating groove of the outer rotor 11 together with the inner rotor 8, but the high-pressure isolation cover 9 does not contact the inner rotor 8 and the outer rotor 11.

[0038] The root of the high-pressure isolation cover 9 is fixedly connected with the first flange plate 10, and the first flange plate 10 is connected with the outer end face of the bearing assembly 5 through bolts. The first flange plate 10 can be customized as a slotted flange, that is, an annular groove is formed on the contact surface of the first flange plate 10 and the bearing assembly 5, and sealing is realized after an O-ring is installed.

[0039] In the embodiment, the top of the high-pressure isolation cover 9 is in the shape of a tapered pointed top or a flat top, and the groove bottom of the accommodating groove on the outer rotor 11 is conformed to the top of the high-pressure isolation cover 9, that is, it is internally tapered and slightly larger in size than the top of the high-pressure isolation cover 9. The advantage of this arrangement is that it is convenient for accurate positioning during installation. In other embodiments, the top of the high-pressure isolation cover 9 can also be made into a flat top on the premise that the user has the ability to accurately position it at the installation site.

[0040] The high-pressure isolation cover 9 functions to form a sealed cavity, converts the original dynamic seal into a static seal, and improves the overall sealing performance. The material of the high-pressure isolation cover 9 is a non-metallic composite material, which is a carbon fiber composite material in the embodiment, and can also be other non-metallic composite materials in other embodiments. The characteristic of the material is that it has high strength and stable connection, does not affect the magnetic coupling transmission between the outer rotor 11 and the inner rotor 8, and also does not cause heating due to magnetic eddy current effect.

[0041] In the embodiment, the fan volute is a split type volute, including the air inlet assembly 4 and the air outlet assembly 6. The air inlet assembly 4 and the air outlet assembly 6 are axially closed and connected into a whole through high-strength bolts, and an O-ring is installed on the connecting surface to ensure sealing. The opposite end faces of the air inlet assembly 4 and the air outlet assembly 6 are both processed into annular semicircular flow channels, and the two flow channels form a complete annular flow channel inside the volute after being closed and installed.

[0042] The air inlet is located at the axial front end of the air inlet assembly 4, and the air outlet is located at the upper end of the air outlet assembly 5. Flanges are arranged at the air inlet and the air outlet, and the flanges are designed according to the medium pressure grade, manufactured by welding or casting, and optimized in structure by using advanced computational fluid dynamics (CFD) software.

[0043] The fan impeller 3 is installed in the fan volute through the bearing assembly 5. Specifically, in the embodiment, the fan impeller 3 and the bearing assembly 5 are installed on the air outlet assembly 6, the impeller body is located inside the fan volute, and the shaft extends out of the air outlet assembly 6.

[0044] The bearing assembly 5 comprises a bearing seat, a high-speed bearing 16, a rotating speed sensor 14 and a bearing temperature sensor 15.

[0045] The air outlet assembly 6 of the fan volute is provided with a stepped mounting hole penetrating into the internal flow channel of the volute, the outer end of the bearing seat is provided with a flange, the size of the flange matches the size of the stepped mounting hole, so that the bearing seat is placed in the mounting hole and fixed by bolt connection, and an O-ring can be additionally installed between the flange and the stepped mounting hole to realize sealing.

[0046] The rotating shaft of the fan impeller 3 is installed on the bearing seat through the high-speed bearing 16, and 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 from the mounting hole together with the bearing assembly 5.

[0047] It should be noted that, due to the change of the transmission form and the sealing form, the problem of high-pressure gas leakage is solved. In the case of no leakage concern, the high-speed motor 1 can be set to a higher rotating speed, so that the size of the fan impeller 3 can be reduced, and after numerical simulation of the impeller shape by computational fluid dynamics (CFD) software, the 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 disassembled for maintenance without disassembling the air inlet assembly 4 and the air outlet assembly 6.

[0048] The rotating speed sensor 14 and the bearing temperature sensor 15 are both installed on the bearing seat and are respectively used for monitoring the rotating speed of the fan impeller and the temperature of the bearing, and when reaching a preset value, an alarm signal is sent to prevent accidents.

[0049] The utility model discloses the structure is exquisite, convenient operation can remove the fan impeller and bearing assembly and maintain under the condition of not removing the fan volute, reduce the maintenance difficulty and cost, improve the maintenance convenience and efficiency, and significantly improve the security, realize high-pressure gas zero leakage.

[0050] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, and the person skilled in the art makes some simple modifications, equivalent changes or modifications by using the disclosed technical contents, which falls within the protection scope of the utility model.

Claims

1. A maintenance-friendly circulating fan in a looped high pressure gas flow prover, characterized by, The high-speed motor, the magnetic coupling shaft, the fan impeller, the bearing assembly and the fan volute are included. 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 shaft. The bearing assembly includes a bearing seat and a high-speed bearing, the back of the fan volute is provided with a stepped mounting hole for mounting the bearing assembly, the outer end of the bearing seat is provided with a flange and is connected with the mounting hole through bolts at the flange, the rotating shaft of the fan impeller is installed on the bearing seat through the high-speed bearing, and the diameter of the fan impeller is smaller than the diameter of the bearing seat, so that the fan impeller can be installed or dismounted from the back of the fan volute together with the bearing assembly.

2. A maintenance friendly circulating fan for use in a looped high pressure gas flow calibration device according to claim 1, characterized in that The bearing assembly is provided with a rotating speed sensor and a bearing temperature sensor for monitoring the rotating speed of the fan impeller and the temperature of the bearing.

3. A maintenance friendly circulating fan for use in a looped 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 opposite and are connected through bolts, the opposite end faces of the air inlet assembly and the air outlet assembly are both processed with annular semicircular flow channels, the air inlet is arranged at the axially front end of the air inlet assembly, and the air outlet is arranged at the upper end of the air outlet assembly.

4. A maintenance friendly circulating fan for use in a looped high pressure gas flow calibration device according to claim 1, characterized in that The high-speed motor is installed on an adjustable base, and the adjustable base is provided with sliding rails for adjusting the horizontal position and vertical height of the high-speed motor.

5. A low maintenance circulating fan for use in a looped high pressure gas flow calibration device as defined in claim 1, wherein, The magnetic coupling shaft includes an outer rotor, an inner rotor, a high-pressure isolation cover and a first flange plate. The end of the outer rotor is provided with a containing groove, the end of the inner rotor is arranged in the containing groove of the outer rotor, and a plurality of N-pole and S-pole spaced magnets are arranged on the inner wall of the containing groove and the outer periphery of the inner rotor in a circumferential direction, so that the number of magnets on the outer rotor and the inner rotor is equal, and the magnetic poles are opposite at the diametrically opposite positions. The high-pressure isolation cover is a thin-walled shell with a closed top, which is arranged between the outer rotor and the inner rotor and does not contact the outer rotor and the inner rotor, the root of the high-pressure isolation cover is fixedly connected with the first flange plate and is connected with the outer end face of the bearing assembly through bolts.

6. A low maintenance circulating fan for use in a looped high pressure gas flow calibration device according to claim 5, wherein, The top of the high-pressure isolation cover is in the shape of a tapered pointed top or a flat top, and the groove bottom of the containing groove is conformal to the top of the high-pressure isolation cover.

7. A low maintenance circulating fan for use in a looped high pressure gas flow calibration device as defined in claim 5, wherein, The magnets on the inner rotor are connected with the inner rotor through a second flange plate and bolts.

8. A low maintenance circulating fan for use in a looped high pressure gas flow calibration device as defined in claim 5, wherein, The material of the magnets is neodymium iron boron or samarium cobalt.

9. A low maintenance circulating fan for use in a looped high pressure gas flow calibration device as defined in claim 5, wherein, The material of the high-pressure isolation cover is a non-metallic composite material.

10. A low maintenance circulating fan for use in a looped high pressure gas flow calibration device according to claim 9, wherein, The material of the high-pressure isolation cover is a carbon fiber composite material.

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