CN202215818U

CN202215818U - Actuator for valve assembly

Info

Publication number: CN202215818U
Application number: CN2011202091558U
Authority: CN
Inventors: T·佩塞克
Original assignee: Fisher Controls International LLC
Current assignee: Fisher Controls International LLC
Priority date: 2011-06-13
Filing date: 2011-06-13
Publication date: 2012-05-09
Anticipated expiration: 2021-06-13

Abstract

The utility model relates to an actuator for a valve assembly. The valve assembly comprises a valve seat, a valve plug and a driving shaft which is operatively jointed to the valve plug. The actuator comprises a transmission case for coupling a motor to the driving shaft; the motor for driving the valve plug via the transmission case to make movement relative to the valve seat; multiple magnetic bodies which are coupled to a rotor of the motor and are rotated when the rotor is rotated; multiple sensors for sensing the passage of each magnetic body and providing feedback to a control assembly; and the control assembly for receiving position instructions, determining the number of pulses of the motor or the rotation number of the motor based on the position instructions, leading to the rotation of the motor until the number of pulses of the motor or the rotation number of the motor is satisfied, also for receiving the feedback from the multiple sensors and determining the position of the valve plug relative to the valve seat based on the feedback.

Description

The actuator that is used for valve assembly

Technical field

The utility model relates to control system, more specifically, relates to the control system that is used for valve assembly.

Background technique

Can use motor to move valve plug with respect to valve seat.In order to confirm amount that valve plug has been moved and/or the valve plug position with respect to valve seat, some control system are used the equipment that separates, such as encoder.

Summary of the invention

An aspect according to the utility model; A kind of actuator that is used for valve assembly is provided; This valve assembly comprises valve seat, valve plug and the live axle that is operatively engaged to said valve plug; Wherein said actuator comprises control unit, motor, a plurality of magnet, a plurality of sensor and transmission case, and wherein said transmission case is configured to said motor is coupled to said live axle; Said motor is configured to drive said valve plug moving with respect to said valve seat via said transmission case; Said a plurality of magnet is coupled to the rotor of said motor, and is configured to when said rotor rotates, said a plurality of magnets rotations; Said a plurality of sensor is configured to each pass through in the said a plurality of magnets of sensing, and to said control unit feedback is provided; Said control unit is configured to the receiving position order; Confirm the quantity of quantity or motor rotation of the motor pulses of said motor based on said position command; And cause said motor rotation; Until the quantity of quantity that arrives said motor pulses or the rotation of said motor, and said control unit is configured to receive the said feedback from said a plurality of sensors further, and confirms the position of said valve plug with respect to said valve seat based on said feedback.

Advantageously, said feedback is a pulse sequence, and said control unit is configured to receive the said pulse sequence from said a plurality of sensors, and confirms the said position of said valve plug with respect to said valve seat based on the counting of motor pulses in the said pulse sequence.

Advantageously, said a plurality of sensors are configured to said control unit direction signal is provided further, and said control unit is configured to confirm the direction that said valve plug is moving based on said direction signal further.

Advantageously; Said control unit is configured to after the said pulse sequence that receives from said a plurality of sensors, handle said pulse sequence further, and confirms the said position of said valve plug with respect to said valve seat based on the said counting of motor pulses in the said pulse sequence of having handled.

Advantageously; Said valve assembly further comprises the spring that is coupled to said transmission case, and wherein said control unit is configured to further confirm that point and the said control unit in that said valve plug engages said valve seat discern said spring by the quantity of the quantity of the said motor pulses between the compressed sufficiently point or the rotation of said motor.

Advantageously; Said control unit is configured to further to be compared the quantity that engages the said motor pulses of said valve seat to said spring during by compressed sufficiently point at said valve plug for the first time with the quantity that engages the said motor pulses of said valve seat to said spring during by compressed sufficiently point at said valve plug for the second time; And use the information of obtaining through said comparison, with move said valve plug to said valve seat engaging more and/or still less.

Description of drawings

Fig. 1 shows the schematic representation of exemplary control valve assembly.

Fig. 2 shows the exemplary control valve assembly of the control valve assembly that can be used to realize Fig. 1.

Fig. 3 shows the part of the exemplary motor pack of the control valve assembly that can be used to realize Fig. 1.

Fig. 4 shows and can be used to and/or programme to be used for being implemented in any one of this described illustrative methods and system or the schematic representation of whole exemplary process applicator platform.

Embodiment

Some examples are shown in the above-mentioned figure and describe in detail below.In describing these examples, similar or identical reference character is used to identify identical or similar elements.These figure might not be in proportion, and from clear and/or succinct purpose, some characteristic of figure may illustrated on the ratio or in schematic representation with some view large.Additionally, in the whole specification several examples have been described.Any characteristic in any example can be included in other characteristics in other examples, substitute other characteristics in other examples or combine with other characteristics in other examples.

Said example relates to control system, this control system can be used to based on receive from confirming with the position of control valve plug with the output of actuator motor sensor associated and/or feedback and/or moving.Motor can be brushless direct current motor, stepping motor or servomotor.If brushless direct current motor is used to be implemented in this described example, when then working as motor magnet process, with production burst string and/or feedback with motor sensor associated (for example, hall effect sensor).Received pulse sequence and/or feedback can be processed and/or equalization, confirm to realize the accurate of motor position.Compare with some known examples, use brushless direct current motor to make that said example can be the element that is used for service meter except those and need not to use additional element.In itself, can be reduced in cost and total number of parts in the control valve assembly of realizing this described example.

Control system can be used several motor pulses, with the distance of confirming and/or control valve plug moves.For example, if 2250 motor pulses with valve plug is moved 3/4 inch and is associated, and received and valve plug moved 3/4 inch position command, then control system will cause the motor rotation, until counting down to 2250 motor pulses.In other examples, if 2250 motor pulses are associated with valve plug being moved 90 degree, and received the position command that valve plug is moved 90 degree, then control system will cause the motor rotation, until counting down to 2250 motor pulses.Can dispose the transmission device (for example, velocity ratio being provided) that motor is coupled to valve plug, valve plug moved 1/6 inch so that the once rotation of motor causes.Yet, can alternatively use any other velocity ratio.

In some instances, control system and brushless direct current motor can combine actuator and valve assembly to use, and wherein this valve assembly is included in valve plug engage valve seat compressible contained spring afterwards.Engage (that is, valve plug is positioned at zero position) afterwards between valve plug and the valve seat being identified in, control system can continue to cause that motor drives valve plug towards valve seat through element (for example, transmission device) and the pressure spring in the movement actuator.Based on the quantity of determined motor pulses and/or received feedback, control system can cause that motor drives the predetermined motor rotation quantity of valve plug, predetermined electronic number of pulses etc. towards valve seat.

Control system identify spring by fully the compression after; Control system can be confirmed and/or count from lighting until control system of the initial engage valve seat of valve plug (for example, zero position) and stops to cause that motor drives the quantity of motor pulses of the point of valve plug towards valve seat.Control system can use the quantity of this motor pulses of confirming to confirm that thereby valve plug must be moved the amount that makes valve plug get back to zero position (that is the point of the initial engage valve seat of valve plug).For example, for valve plug is moved to the point of the initial engage valve seat of valve plug from spring by compressed sufficiently point, motor possibly move valve plug, so that confirms ten motor pulses.Additionally or alternatively, control system will the first time valve plug engage valve seat to the quantity of the motor pulses of spring during by compressed sufficiently point with the second time valve plug engage valve seat to the quantity of the motor pulses of spring during by compressed sufficiently point relatively.Control system can be used the information of obtaining through this comparison, with move valve plug to valve seat engaging more and/or still less (for example, more or less strong joint), with the wearing and tearing of identification valve plug and/or valve seat, with the wearing and tearing of identification spring, etc.

In some instances, can be increased in reduction speed ratio between motor and the valve plug (for example, control unit) to increase positioning resolution.Said motor can use with the systems incorporate of a plurality of encoders of common use, to be reduced in this described cost and total number of parts.

Fig. 1 shows the exemplary control valve assembly 100 that comprises actuator 102 and valve assembly 104.Though valve assembly 104 is shown as slip stem valve (sliding stem valve), said example can combine the valve of any other type, is implemented such as rotary valve.Actuator 102 can comprise control unit 106,108, motor 110 and transmission case 112.Control unit 106 and/or 108 can receive energy and/or the control signal from external source 114.Control unit 106 and/or 108 can discern valve plug 202 (Fig. 2) with respect to the position of valve seat 204 (Fig. 2) and/or cause that valve plug 202 keeps and/or move to certain location.Control unit 106 and/or 108 can use the data from motor 110 and/or controller associated therewith that receive to confirm the position of valve plug 202 with respect to valve seat 204.

Control unit 106 and/or 108 can be discerned and/or the moving of control valve plug 202 based on the relation between the mobile distance of the motor pulses that valve plug 202 is identified and/or counts for each.Control unit 106 and/or 108 can be discerned and/or count at the point of valve plug 202 engage valve seat 204 and control unit 106 and/or 108 and confirm that the spring 206 (Fig. 2) of actuator 102 is rotated by the motor between the compressed sufficiently point or the quantity of motor pulses.When after valve plug 202 engage valve seat 204 grades, having confirmed and/or when the motor pulses of counting specific quantity and/or motor rotation, control unit 106 and/or 108 can confirm that spring 206 is by fully compression.As stated, can use the feedback that receives to confirm motor pulses counting and/or motor rotation counting by control unit 106 and/or 108 from motor 110.

Through using the data obtained when the pressure spring 206 (for example; Motor pulses of that several are confirmed or counting), control unit 106 and/or 108 control valve plug 202 mobile from the compressed point of opening to valve 50% of spring 206 for example accurately.More specifically; It is compressed to zero position from spring 206 that control unit 106 and/or 108 can cause that motor 110 drives valve plug 202; And from zero position, control unit 106 and/or 108 can cause further that motor 110 drives valve plug 202 to 50% open positions.The control of valve plug 202 and/or location can be based on the position command that is received and several motor pulses related with the mobile phase of corresponding valve plug 202.

Fig. 2 shows the exemplary control valve assembly 200 of the control valve assembly 100 that can be used to realize Fig. 1.

In operation, control unit 106 and/or 108 can cause the axle 208 of motor 110 rotation drive transmissions 210 and 212.Transmission device 212 engages the tooth 214 of the live axle 215 that is operatively engaged to valve plug 202.When valve plug 202 is lifted off a seat 204 certain distances and/or when valve plug 202 is not driven to more with the engaging of valve seat 204, the interaction between transmission device 212 and tooth 214 is moved valve plug 202 with respect to valve seat 204.Yet; When valve plug 202 (for example engages with valve seat 204; Valve plug 202 is at the end of its running length) and control unit 106 and/or 108 continue to cause motor 110 drive transmissions 210 and at 212 o'clock,

transmission device

210 and 212 and tooth 214 between interaction cause that transmission device 212 is to move like arrow 216 pointed directions haply.When transmission device 212 when moving like arrow 216 pointed directions haply, spring 206 is compressed, its load valve plug 202 and increased the power of valve plug 202 engage valve seat 204.

Control unit 106 and/or 108 can wait based on the motor pulses of determined and/or the specific quantity counted and/or the feedback from motor 110 that receives discerns spring 106 by fully compression.When spring 206 was fully compressed, control unit 106 and/or 108 can cause the power supply of closing motor 110, its can cause axle 208,

transmission device

210 and 212 and tooth 214 between combination relax slightly or unload.In some control valve assemblies, relaxing or unloading of drive transmission can cause that valve plug 202 moves away from valve seat 204 and/or reduces the power that engages between valve plug 202 and valve seat 204.Yet, use said example, the power that is applied by spring 206 will maintain enough the engaging (that is, enough engaging forces) between valve plug 202 and the valve seat 204, even the power supply of motor 110 is closed.

Fig. 3 shows the schematic representation of the exemplary brushless direct current motor assembly 300 that can be used to be implemented in this described example.Electric motor assembly 300 comprises control unit 302, a plurality of magnet 304 and a plurality of hall effect sensor 306.In operation, magnet 304 can be coupled to the rotor of motor, and therefore when rotor rotated, magnet 304 rotated.When magnet 304 rotation, the passing through and output pulse string and/or direction signal to control unit 302 of each magnet 304 of sensor 306 sensings.Based on pulse sequence output and/or count received motor pulses, control unit 302 can confirm that the moving of motor and/or valve plug 202, valve plug 202 are with respect to the position of valve seat 204 etc.The pulse sequence that control unit 302 can be handled and/or equalization is received is confirmed to realize the accurate of motor position.Based on the direction signal that is received, control unit 302 can be confirmed the direction that motor and/or valve plug 202 are moving.

Fig. 4 shows the skeleton diagram of the example processor system 400 that can be used to be implemented in this described system and method.As shown in Figure 4, processor system 400 comprises processor 402, and it is coupled to interconnect bus 404.Processor 402 can be any suitable processor, processing unit or microprocessor.Though not shown in Fig. 4, processor system 400 can be multicomputer system and, therefore can comprise one or more additional processors, it is identical or similar with processor 402, and is coupled to interconnect bus 404 communicatedly.

The processor 402 of Fig. 4 is coupled to chip set 406, and it comprises Memory Controller 408 and I/O (I/O) controller 410.As known, chip set provides I/O and memory management functions and a plurality of general and/or special register, timer etc. usually, and it can be by the one or more processor access or the use that are couple to chip set 406.Memory Controller 408 is carried out and is made the processor 402 (or a plurality of processor, if a plurality of processors are arranged) can access system memory 412 and the function of bulk memory 414.

System storage 412 can comprise the loss tendency and/or the nonvolatile memory of any desired type, for example, and static RAM (SRAM), dynamic random access memory (DRAM), flash memory, ROM (read-only memory) (ROM) etc.Bulk memory 414 can comprise the bulk memory of any desired type, and it comprises hard disk drive, optical drive, fc tape storage device FC etc.

I/O controller 410 is carried out the function that processor 402 can be communicated by letter with 418 and network interface 420 through I/O bus 422 and peripheral I/O (I/O) equipment 416.I/

O equipment

416 and 418 can be the I/O equipment of any desired type, for example keyboard, VDU video display unit or monitoring unit, mouse etc.Network interface 420 can be ethernet device that processor system 400 can be communicated by letter with another processor system, ATM(Asynchronous Transfer Mode) equipment, 802.11 equipment, DSL modulator-demodulator, cable modem, cellular modem etc.

Though Memory Controller 408 is shown in the independent piece in the chip set 406 with I/O controller 410 in Fig. 4, the performed function of these pieces can be integrated in maybe can use two or more separate integrated circuit to realize in the single semiconductor circuit.

Claims

1. actuator (102) that is used for valve assembly (104); This valve assembly (104) comprises valve seat (204), valve plug (202) and the live axle (215) that is operatively engaged to said valve plug (202); It is characterized in that; Said actuator (102) comprises control unit (106,108), motor (110), a plurality of magnet (304), a plurality of sensor (306) and transmission case (112), wherein

Said transmission case (112) is configured to said motor (110) is coupled to said live axle (215);

Said motor (110) is configured to drive said valve plug (202) moving with respect to said valve seat (204) via said transmission case (112);

Said a plurality of magnet (304) is coupled to the rotor of said motor (110), and is configured to when said rotor rotates, said a plurality of magnets (304) rotation;

Said a plurality of sensor (306) is configured to each pass through in the said a plurality of magnets of sensing (304), and to said control unit (106,108) feedback is provided;

Said control unit (106; 108) be configured to the receiving position order; Confirm the quantity of quantity or motor rotation of the motor pulses of said motor (110) based on said position command; And cause said motor (110) rotation, until the quantity of quantity that arrives said motor pulses or the rotation of said motor, and said control unit (106; 108) be configured to further receive said feedback, and confirmed the position of said valve plug (202) with respect to said valve seat (204) based on said feedback from said a plurality of sensors (306).

2. actuator according to claim 1 (102); It is characterized in that; Said feedback is a pulse sequence; Said control unit (106,108) is configured to receive the said pulse sequence from said a plurality of sensors (306), and confirms the said position of said valve plug (202) with respect to said valve seat (204) based on the counting of motor pulses in the said pulse sequence.

3. actuator according to claim 2 (102); It is characterized in that; Said a plurality of sensor (306) is configured to said control unit (106 further; 108) direction signal is provided, and said control unit (106,108) is configured to further confirm the direction that said valve plug (202) is moving based on said direction signal.

4. actuator according to claim 2 (102); It is characterized in that; Said control unit (106; 108) be configured to further after the said pulse sequence that receives from said a plurality of sensors (306), handle said pulse sequence, and confirmed the said position of said valve plug (202) with respect to said valve seat (204) based on the said counting of motor pulses in the said pulse sequence of having handled.

5. actuator according to claim 1 (102); It is characterized in that; Said valve assembly (104) further comprises the spring (206) that is coupled to said transmission case (112); Wherein said control unit (106,108) is configured to further confirm that point and the said control unit (106,108) in that said valve plug (202) engages said valve seat (204) discern said spring (206) by the quantity of the quantity of the said motor pulses between the compressed sufficiently point or the rotation of said motor.

6. actuator according to claim 5 (102); It is characterized in that; Said control unit (106; 108) be configured to further the quantity that engages the said motor pulses of said valve seat (204) to said spring (206) during by compressed sufficiently point at said valve plug (202) is for the first time compared with the quantity that engages the said motor pulses of said valve seat (204) to said spring (206) during by compressed sufficiently point at said valve plug (202) for the second time; And use the information of obtaining through said comparison, with move said valve plug (202) to said valve seat (204) engaging more and/or still less.

7. actuator according to claim 1 (102) is characterized in that, said motor (110) is a brushless direct current motor, and said a plurality of sensor (305) is a hall effect sensor.