WO2023174359A1

WO2023174359A1 - Electric valve, and alternating current asynchronous electric motor therefor

Info

Publication number: WO2023174359A1
Application number: PCT/CN2023/081805
Authority: WO
Inventors: 周文; 赵战国; 魏猛; 付兴; 王宝; 郝云轩; 王晓江; 王泽平; 赵英超; 戚文华; 马晓荣
Original assignee: 北京雷蒙赛博核装备技术研究有限公司
Priority date: 2022-03-17
Filing date: 2023-03-16
Publication date: 2023-09-21
Also published as: CN217469693U

Abstract

An electric valve and an alternating current asynchronous electric motor therefor. The electric valve comprises a valve, a transmission device, the alternating current asynchronous electric motor and a driver. The alternating current asynchronous electric motor is connected to the valve by means of the transmission device; and the driver is connected to the alternating current asynchronous electric motor and controls the opening and closing of the valve by means of the alternating current asynchronous electric motor. The alternating current asynchronous electric motor comprises: a housing; a rear end cover, which is installed at the rear end of the housing; a stator, which is installed inside the housing; a rotor, which is installed inside the housing corresponding to the stator and is supported on the housing by means of an electric motor shaft; and a position sensor, which is installed inside the rear end cover and is connected to the tail end of the electric motor shaft. The utility model can match different control modes according to position signals of different working stages that are divided by the process of opening and closing of the valve, so as to realize precise control over an output position, a speed and a torque of the alternating current asynchronous electric motor.

Description

An electric valve and its AC asynchronous motor

Technical field

The utility model relates to an electric valve and its driving device, in particular to an electric valve and its AC asynchronous motor.

Background technique

The existing valve electric device uses the power supply to directly start the AC asynchronous motor, and the motor drives the mechanical transmission mechanism to drive the valve to operate and realize valve opening/closing. AC asynchronous motors are widely used in electric devices due to their simple structure, reliable operation, light weight, cheap price and large starting torque. However, during use, the rotation speed of the AC asynchronous motor is fixed during the operation of the valve, and the valve opens. The valve/valve closing speed remains unchanged. When the valve closing reaches the dead center, it is easy to cause the dynamic load of the valve seat to be overloaded, resulting in the problem that the valve cannot be opened after being tightly closed. Dynamic load overload will also accelerate the wear of the valve sealing surface and reduce the service life of the valve. The torque control accuracy of the AC asynchronous motor for closing and opening the valve is low, coupled with the influence of medium temperature, foreign matter, corrosion and other factors, the driving torque when opening the valve cannot overcome all the resistance torque, causing the valve to fail to open. The fixed speed cannot meet the requirements of quickly opening/closing the valve in emergency situations, nor can it meet the speed regulation operation of valves prone to "water hammer" conditions. Therefore, it is impossible to achieve networked centralized remote control with high reliability and strong anti-interference performance.

Utility model content

The technical problem to be solved by this utility model is to provide an electric valve and its AC asynchronous motor in view of the above-mentioned defects of the prior art.

In order to achieve the above purpose, the utility model provides an AC asynchronous motor, which includes:

shell;

a rear end cover, installed at the rear end of the housing;

a stator, installed in the housing;

a rotor, installed in the housing corresponding to the stator and supported on the housing through a motor shaft; and

A position sensor is installed in the rear end cover and connected to the rear end of the motor shaft.

The above-mentioned AC asynchronous motor, wherein the housing includes:

The housing is a hollow cylindrical structure, and the stator is installed on the housing;

A front end flange is located at the front end of the housing, and the front end flange is provided with a front bearing hole and a front end connection structure;

The rear end flange is located at the rear end of the housing. The rear end flange is provided with a rear bearing hole and a rear end connection structure. The motor shaft is supported by the front bearing and the rear bearing and is installed on the front end method. On the flange and the rear end flange, the front bearing and the rear bearing are respectively installed in the front bearing hole and the rear bearing hole; and

A fixed base is provided on one side of the housing.

In the above-mentioned AC asynchronous motor, the housing is an integral structural member, and a plurality of heat sinks are evenly arranged on the outer surface of the housing.

The above-mentioned AC asynchronous motor, wherein the rear end cover is installed on the tail end flange, the rear end cover is also provided with a connection interface for connecting to an external driving device or a calibration device, and the connection interface The center line is on the same straight line as the axis of the motor shaft.

The above-mentioned AC asynchronous motor, wherein the position sensor includes:

upper cover;

The lower cover snaps together with the upper cover to form a storage space;

Sensor, arranged in the accommodation space;

A sensor shaft, one end of which is connected to the sensor;

A driving shaft sleeve is located in the accommodation space and is installed and supported on the upper cover and the lower cover. One end of the driving shaft sleeve is connected to the rear end of the motor shaft; and

A transmission wheel set is located in the accommodation space. The driving wheel of the transmission wheel set is connected to the drive shaft sleeve, and the driven wheel of the transmission wheel set is connected to the other end of the sensor shaft.

In the above-mentioned AC asynchronous motor, the transmission wheel set is a gear transmission pair, a synchronous pulley transmission pair or a magnetic transmission wheel set.

In the above AC asynchronous motor, the sensor is an absolute encoder, a relative encoder or a rotary transformer.

In the above-mentioned AC asynchronous motor, the driving wheel of the transmission wheel set is connected to the middle part of the driving shaft sleeve through key connection, interference fit or jack screw fixation.

In the above AC asynchronous motor, the sensor is fixed on the upper cover, and the upper cover is installed on the rear end flange through fasteners.

In order to better achieve the above purpose, the utility model also provides an electric valve, including a valve, a transmission device, an AC asynchronous motor and a driver. The AC asynchronous motor is connected to the valve through the transmission device, and the driver It is connected to the AC asynchronous motor, and controls the opening and closing of the valve through the AC asynchronous motor, wherein the AC asynchronous motor is the above-mentioned AC asynchronous motor.

The beneficial effects of this utility model are:

The utility model can achieve precise control of the output position, speed and torque of the AC asynchronous motor by optimizing the matching parameters of speed and torque according to the load change of the switch valve throughout the entire stroke, and the rated specifications of the AC asynchronous motor. Small, thereby reducing the total volume and weight of the product and reducing costs, improving the dynamic characteristics of the electric valve pipeline system; improving the smoothness control of the AC asynchronous motor dragging the load, and reducing the current impact on the power grid.

The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the utility model.

Description of the drawings

Figure 1 is a schematic structural diagram of an electric valve according to an embodiment of the present utility model;

Figure 2 is a schematic structural diagram of an AC asynchronous motor according to an embodiment of the present invention;

Figure 3 is a schematic structural diagram of the housing according to an embodiment of the present utility model;

Figure 4 is a schematic structural diagram of a position sensor according to an embodiment of the present invention;

Figure 5 is a schematic diagram of the installation of a position sensor according to an embodiment of the present invention;

Figures 6A-6C are respectively schematic structural diagrams of the rear end cover of the present utility model.

Among them, reference signs
1 valve
2 transmission device
21 transmission flange
3AC asynchronous motor
31 shell
311 shell
312 heat sink
313 fixed seat
314 front end flange
315 end flange
32 motor shaft
33 stator
34 rotors
35 rear end cover
351 connection interface
36 front bearing
37 rear bearing
38 position sensor
381 upper cover
382 lower cover
383 sensor
384 sensor shaft
385 transmission wheel set
386 bearing
387 drive bushing
4 drives

Detailed ways

The structural principle and working principle of the present invention will be described in detail below in conjunction with the accompanying drawings:

Referring to Figure 1, Figure 1 is a schematic structural diagram of an electric valve 1 according to an embodiment of the present invention. The electric valve 1 of the utility model includes a valve 1, a transmission device 2, an AC asynchronous motor 3 and a driver 4. The AC asynchronous motor 3 is connected to the valve 1 through the transmission device 2, and the driver 4 is connected to the valve 1. An AC asynchronous motor 3 is connected, and the opening and closing of the valve 1 is controlled through the AC asynchronous motor 3 . The AC asynchronous motor 3 is positioned with the transmission flange 21 of the transmission device 2 through the front end flange 314, and can be fixed with bolts. The motor shaft 32 of the AC asynchronous motor 3 and the input shaft of the transmission device 2 can be connected through a key. The AC asynchronous motor 3 provides driving power for the transmission device 2. The AC asynchronous motor 3 receives instructions from the driver 4 and transmits the motor torque through the motor shaft 32. To the transmission device 2, the transmission device 2 decelerates and drives the valve stem of the valve 1 to perform the opening or closing action. The electric valve 1 other The composition, structure, mutual positional relationship, connection relationship and working principle of the parts are relatively mature existing technologies, so they will not be described in detail here. Only the AC asynchronous motor 3 of the present utility model will be described in detail below.

Referring to Figure 2, Figure 2 is a schematic structural diagram of an AC asynchronous motor 3 according to an embodiment of the present invention. The AC asynchronous motor 3 of the present utility model includes: a casing 31; a rear end cover 35, which is installed at the rear end of the casing 31; a stator 33, which is installed in the casing 31, and its kinetic energy comes from the three-phase alternating current of the driver 4. And generate a rotating magnetic field; the rotor 34 is installed in the housing 31 corresponding to the stator 33 and is supported on the housing 31 through the motor shaft 32. The rotor 34 is concentric with the stator 33 and rotates with the rotating magnetic field to generate For rotational power, both the front end and the rear end of the motor shaft 32 can adopt a keyway structure or a spline structure; and a position sensor 38 is installed in the rear end cover 35 and connected to the rear end of the motor shaft 32. The position sensor 38 38 is used to monitor the angular displacement of the AC asynchronous motor 3 and transmit the angular displacement signal to the driver 4.

Referring to Figure 3, Figure 3 is a schematic structural diagram of the housing 31 according to an embodiment of the present invention. The housing 31 of this embodiment includes: a housing 311, which is a hollow cylindrical structure; the stator 33 is fixedly installed on the housing 311; a front flange 314 is located at the front end of the housing 311. The flange 314 is provided with 36 holes of the front bearing and a front-end connection structure. The front-end connection structure can be a threaded hole, which is used to achieve connection and fixation with the transmission device 2 of the electric valve 1; the rear end flange 315 is located on the housing 311. At the rear end, the rear end flange 315 is provided with a rear bearing 37 hole and a rear end connection structure. The rear end connection structure can be a threaded hole for fixing the rear end cover 35. The motor shaft 32 passes through the front bearing respectively. 36 and the rear bearing 37 are supported and installed on the front end flange 314 and the rear end flange 315. The front bearing 36 and the rear bearing 37 are respectively installed in the front bearing 36 hole and the rear bearing 37 hole; and fixed The seat 313 is provided on one side of the housing 311 and is used for connecting and fixing the driver 4 or the junction box. The drive cable and communication cable of the motor pass through the fixed seat 313 to connect to the driver 4 or the junction box. Among them, the housing 31 is preferably an integrated structural member. A plurality of heat sinks 312 can be evenly arranged on the outer surface of the housing 311. The heat sinks 312 can be a plurality of annular protruding structures on the housing 311. Mainly It is used to increase the heat dissipation area of the housing 311 and improve the heat dissipation effect.

Referring to Figures 4 and 5, Figure 4 is a schematic structural diagram of the position sensor 38 according to an embodiment of the present invention, and Figure 5 is a schematic diagram of the installation of the position sensor 38 according to an embodiment of the present invention. The position sensor 38 of this embodiment is installed in the rear end cover 35 and includes: an upper cover 381; a lower cover 382, which snaps together with the upper cover 381 to form an accommodation space; and a sensor 383, which is arranged in the accommodation space. Inside; sensor shaft 384, One end is connected to the sensor 383; the driving sleeve 387 is located in the accommodation space and is installed and supported on the upper cover 381 and the lower cover 382 through bearings 386. One end of the driving sleeve 387 is connected to the motor. The tail end of the shaft 32 is connected; and the transmission wheel set 385 is located in the accommodation space. The driving wheel of the transmission wheel set 385 is connected to the driving sleeve 387, and the driven wheel of the transmission wheel set 385 is connected to the drive shaft sleeve 387. The other end of the sensor shaft 384 is connected. The transmission wheel set 385 may be a gear transmission pair, a synchronous pulley transmission pair or a magnetic transmission wheel set. The sensor 383 can be an absolute encoder, a relative encoder or a rotary transformer. The sensor 383 is preferably fixed on the upper cover 381, and the lower cover 382 can be installed on the rear end flange 315 through fasteners. superior. The driving wheel of the transmission wheel set 385 in this embodiment can be connected to the middle part of the driving sleeve 387 through key connection, interference fit or jack screw fixation.

Referring to Figures 6A-6C, Figures 6A-6C are respectively schematic structural diagrams of the rear end cover 35 of the present utility model. The rear end cover 35 is installed on the rear end flange 315 and fixed by bolts, forming a cavity with the housing 311. A driving hole can be left in the center of the rear end cover 35, and a useful hole can also be provided. Regarding the connection interface 351 connected to an external driving device or calibration device, the center line of the connection interface 351 and the axis of the motor shaft 32 are located on the same straight line. The connection interface 351 can adopt a pin connection, a spline connection, a bolt connection, etc. The connection interface 351 in Figure 6A is a pin connection structure, the connection interface 351 in Figure 6B is a spline connection structure, and the connection interface 351 in Figure 6C is a spline connection structure. 351 is the structure when bolted.

When valve 1 needs to be closed, the AC asynchronous motor 3 is energized, adopts the speed priority strategy, and accelerates to the set no-load speed at the maximum acceleration. The set no-load speed is preferably the overclocking speed of the motor to maintain the no-load speed operation. When the position sensor 38 After detecting that the deceleration position is in place, the motor decelerates to the set approach speed, maintains the approach speed and adopts the torque priority strategy, and runs at the set torque until the driver 4 detects that the set torque is reached, and maintains the set torque for the set time. Finally, the AC asynchronous motor 3 is powered off and the valve 1 is closed. When valve 1 needs to be opened, the AC asynchronous motor 3 is energized and uses the torque priority strategy to start at the set torque. When the position sensor 38 detects the movement of valve 1, it uses the speed priority strategy to accelerate to the set no-load speed at the maximum acceleration. The set no-load speed is preferably the overclocking speed of the motor to maintain the no-load speed operation. When the position sensor 38 detects that the deceleration position is in place, the motor decelerates to a maximum deceleration and stops, and the opening of valve 1 is completed.

Of course, the present utility model can also have various other embodiments. Without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model. However, These corresponding changes and deformations should all fall within the protection scope of the appended claims of this utility model.

Claims

An AC asynchronous motor, characterized by including:

shell;

a rear end cover, installed at the rear end of the housing;

a stator, installed in the housing;

a rotor, installed in the housing corresponding to the stator and supported on the housing through a motor shaft; and

A position sensor is installed in the rear end cover and connected to the rear end of the motor shaft.
The AC asynchronous motor according to claim 1, wherein the housing includes:

The housing is a hollow cylindrical structure, and the stator is installed on the housing;

A front end flange is located at the front end of the housing, and the front end flange is provided with a front bearing hole and a front end connection structure;

The rear end flange is located at the rear end of the housing. The rear end flange is provided with a rear bearing hole and a rear end connection structure. The motor shaft is supported by the front bearing and the rear bearing and is installed on the front end method. On the flange and the rear end flange, the front bearing and the rear bearing are respectively installed in the front bearing hole and the rear bearing hole; and

A fixed base is provided on one side of the housing.
The AC asynchronous motor according to claim 2, wherein the housing is an integral structural member, and a plurality of heat sinks are provided on the outer surface of the housing.
The AC asynchronous motor according to claim 3, characterized in that the rear end cover is installed on the rear end flange, and the rear end cover is also provided with a connection for connecting to an external driving device or a calibration device. interface, the center line of the connection interface and the axis of the motor shaft are located on the same straight line.
The AC asynchronous motor according to claim 2, 3 or 4, characterized in that the position sensor includes:

upper cover;

The lower cover snaps together with the upper cover to form a storage space;

Sensor, arranged in the accommodation space;

A sensor shaft, one end of which is connected to the sensor;

A driving shaft sleeve is located in the accommodation space and is installed and supported on the upper cover and lower cover. One end of the moving shaft sleeve is connected to the tail end of the motor shaft; and

A transmission wheel set is located in the accommodation space. The driving wheel of the transmission wheel set is connected to the drive shaft sleeve, and the driven wheel of the transmission wheel set is connected to the other end of the sensor shaft.
The AC asynchronous motor according to claim 5, wherein the transmission wheel set is a gear transmission pair, a synchronous pulley transmission pair or a magnetic transmission wheel set.
The AC asynchronous motor according to claim 5, wherein the sensor is an absolute encoder, a relative encoder or a rotary transformer.
The AC asynchronous motor according to claim 5, characterized in that the driving wheel of the transmission wheel set is connected to the middle part of the driving shaft sleeve through key connection, interference fit or jackscrew fixation.
The AC asynchronous motor according to claim 5, wherein the sensor is fixed on the upper cover, and the upper cover is installed on the rear end flange through fasteners.
An electric valve, including a valve, a transmission device, an AC asynchronous motor and a driver. The AC asynchronous motor is connected to the valve through the transmission device. The driver is connected to the AC asynchronous motor and is connected to the AC asynchronous motor through the AC asynchronous motor. The electric motor controls the opening and closing of the valve, and is characterized in that the AC asynchronous motor is the AC asynchronous motor described in any one of the above claims 1-9.