CN101205978B - Electric control valve and electric execution element - Google Patents

Electric control valve and electric execution element Download PDF

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Publication number
CN101205978B
CN101205978B CN2007103021828A CN200710302182A CN101205978B CN 101205978 B CN101205978 B CN 101205978B CN 2007103021828 A CN2007103021828 A CN 2007103021828A CN 200710302182 A CN200710302182 A CN 200710302182A CN 101205978 B CN101205978 B CN 101205978B
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China
Prior art keywords
torque
mentioned
driving gear
motor
driving
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Expired - Fee Related
Application number
CN2007103021828A
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Chinese (zh)
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CN101205978A (en
Inventor
古谷元洋
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Azbil Corp
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Azbil Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/46—Attachment of sealing rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/53—Mechanical actuating means with toothed gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/10—Spindle sealings with diaphragm, e.g. shaped as bellows or tube
    • F16K41/103—Spindle sealings with diaphragm, e.g. shaped as bellows or tube the diaphragm and the closure member being integrated in one member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Lift Valve (AREA)
  • Gear Transmission (AREA)

Abstract

The invention provides an electric control valve and an electric executing element, which can detect the load torque that is loaded on a motor or a loading transmission gear and can switch the driving torque so as to load the necessary driving torque reliably in the opening-degree control of a valve. The electric control valve and the electric executing element comprise a first transmission gear for transmitting the driving torque of the motor 3, a second transmission gear adjacent to the first transmission gear and joggled with the first transmission gear, a third transmission gear joggled with second transmission gear and used for transmitting the driving torque of the motor (3) to an output shaft, a switch (13) for controlling a driving control part which switches the torque of the motor, an arm (10) which is driven by the load corresponding to the torque transmitted from the first transmission gear and the second transmission gear so as to achieve the ON or OFF of the switch (13) when the rotation of the output shaft (4) is limited.

Description

Motor-operated control valve and electric execution element
Technical field
The present invention relates to a kind of aperture and control the motor-operated control valve of fluid flow by the adjusting linear motion valve, and a kind of electric execution element that is used for this motor-operated control valve.
Background technique
(claim spherical valve again at the change stop valve, English name globe valve, its valve body profile is circular, spool moves up and down with valve rod and valve is opened and closed) etc. linear motion valve (promptly, the valve that spool moves in the vertical direction) in the operation of aperture, when the valve full cut-off, in order to prevent internal leakage, need with the power more than the specified value spool by being pressed on the valve opening portion.On the other hand, in general, when valve mediates aperture, make it move needed power less than above-mentioned power of pushing.If the drive motor of spool is selected in the torque of required pressing force during based on generation valve full cut-off, consider the situations such as dispersion of environment temperature environment or reduction gear unit efficient, then need select the relatively large motor of exportable high torque (HT).In addition, in order to adapt to such motor output, the gear unit of executive component also need maximize.Thus, be difficult to avoid the problem that the whole change of motor-operated control valve is big, cost increases.
Therefore, it is variable that people wish to drive the torque of drive motor of spool, can be when the valve full cut-off with the torque actuated spool of maximum.As the motor-operated control valve that carries out this control, the open communique spy of existing a kind of for example Japanese patent of invention opens (patent documentation 1) disclosed device flat 8-247323 number.With regard to the flow control valve of patent documentation 1, regulate in the control of ball valve (ball valve) isogonism stroke valve of aperture at the rotating operation of the spool by having liquid entering hole and liquid outlet, detect spool and whether be positioned at full close position, in the time of near spool is positioned at full close position, the output torque of motor is increased.By such control, when the full close position from valve drives spool, can prevent that spool is adhered to full close position, thereby can carry out valve event reliably.
But the flow control valve of patent documentation 1 can not be handled except that full close position the influence that is subjected to fluid etc. under the situation and the situation that needs high torque (HT) to drive.Especially for linear motion valve,, need after spool is in the full-shut position that contacts with the valve opening portion, further push spool, but the structure of patent documentation 1 to fail to handle this problem with suitable torque in order to prevent internal leakage as described above reliably.
In addition, in the structure of patent documentation 1, what use in aperture identification is the driving pulse of motor.But in practical operation, when motor is not pressed the driving pulse action, just might cause to switch in appropriate position the driving torque of spool.
In addition, in the flow control valve of patent documentation 1, the microprocessor that need carry out memory storing and carry out the driving pulse FREQUENCY CONTROL of stepper motor detected full close position, this causes the control circuit of executive component to become complicated easily, and cost increases.
Summary of the invention
The present invention makes in order to address the above problem, purpose is to provide a kind of motor-operated control valve and a kind of electric execution element that is used for this motor-operated control valve, it can detect in the aperture control of valve and be carried in the load torque on motor or the driving gear and switch driving torque, supplies with the driving torque that needs exactly with this.
Motor-operated control valve provided by the invention has: drive control part, and its driving torque with motor switches to lower torque or higher torque; Torque detection means, it detects the load torque more than the specified value that is carried on the electric execution element in valve opening control, in addition, the load torque that drive control part detects according to torque detection means switches to lower torque or higher torque with the driving torque of motor.
Motor-operated control valve of the present invention is preferred, valve body is a linear motion valve, it has valve opening portion and the spool that is located at the valve rod end for the fluid inflow and outflow, valve rod moves vertically, spool is opened or the draught excluder opening portion, and, full-shut position or full-gear become in valve opening, when the rotation of output shaft is restricted, torque detection means detect the driving torque of coming from the motor transmission and with it as load torque.
Motor-operated control valve of the present invention is also preferred, and torque detection means has: the 1st driving gear that transmits the driving torque of motor; The 2nd driving gear, itself and the 1st driving gear adjacency, and mesh with the 1st driving gear; The 3rd driving gear, itself and the 2nd driving gear mesh, and transmit the driving torque of motor to output shaft; Switch, it is controlled the drive control part that carries out the motor torque switching; Switching control mechanism when the rotation of output shaft is restricted, and makes this switching control mechanism action, to be switched on or switched off switch through the 1st driving gear and the corresponding load of the 2nd driving gear institute load transmitted torque.
Motor-operated control valve of the present invention is also preferred, above-mentioned switching control mechanism has the 1st stationary axle, the 2nd gear is mounted thereon in the mode of the 1st stationary axle rotation relatively, this switching control mechanism is installed on the 2nd stationary axle as the 3rd driving gear gyration center in rotating mode, it is the restriction that the rotation at center is subjected to elastomeric loading force with the 2nd stationary axle, and, when the rotation of output shaft is restricted, with make the elastomer distortion through the 1st driving gear and the corresponding load of the 2nd driving gear institute load transmitted torque, switching control mechanism is that rotate at the center with the 2nd stationary axle, to be switched on or switched off switch.
The present invention also provides a kind of electric execution element, and this electric execution element has: drive control part, and its driving torque with motor switches to lower torque or higher torque; Torque detection means, it detects the load torque that loads in valve opening control, and the load torque that drive control part detects according to above-mentioned torque detection means switches to lower torque or higher torque with the driving torque of motor.
Electric execution element of the present invention is also preferred, and torque detection means has: the 1st driving gear that transmits the driving torque of motor; The 2nd driving gear, itself and the 1st driving gear adjacency, and mesh with the 1st driving gear; The 3rd driving gear, itself and the 2nd driving gear mesh, and transmit the driving torque of motor to output shaft; Switch, it is by being switched on or switched off, and control is switched by the torque that drive control part carries out; Switching control mechanism when the rotation of output shaft is restricted, and makes this switching control mechanism action through the 1st driving gear and the 2nd driving gear from the corresponding load of the load torque as driving torque of motor transmission, to be switched on or switched off switch.
Electric execution element of the present invention is also preferred, switching control mechanism has the 1st stationary axle, the 2nd gear is mounted thereon in the mode of the 1st stationary axle rotation relatively, this switching control mechanism is installed on the 2nd stationary axle as the 3rd driving gear gyration center in rotating mode, it is the restriction that the rotation at center is subjected to elastomeric loading force with the 2nd stationary axle, and, when the rotation of output shaft is restricted, by with through the 1st driving gear and the corresponding load of the 2nd driving gear institute load transmitted torque, make the elastomer distortion, this switching control mechanism is that rotate at the center with the 2nd stationary axle, to be switched on or switched off switch.
Adopt the present invention, because in the control of valve opening, detect the load torque that is carried on the electric execution element, and according to the testing result of this load torque, the driving torque of motor is switched to higher torque from lower torque, so,, also can as required it be switched to high torque (HT) usually to make valve event than low torque, therefore, device of the present invention needn't use the bigger high capacity motor of output torque, and not only the structure cheapness also can be sought the miniaturization of device.In addition, not to switch driving torque, but detect the load torque that in the driving of spool, produces, switch driving torque with this, thereby can load the torque that needs rightly according to the position of spool.
In addition, adopt the present invention, because the valve opening at linear motion valve is the state or the full-gear of full cut-off, when the rotation of output shaft is restricted, the driving torque that detection comes from the motor transmission and with it as load torque, therefore, can prevent has the load of excessive torque to be carried on the spool when the linear motion valve full cut-off, and effectively spool is prevented the pressing operation of necessity of internal leakage.
In addition, adopt the present invention, because motor-operated control valve has: the 1st driving gear that transmits the driving torque of motor; The 2nd driving gear, itself and the 1st driving gear adjacency, and mesh with the 1st driving gear; The 3rd driving gear, itself and the 2nd driving gear mesh, and transmit the driving torque of motor to output shaft; Switch, it controls the torque switching of being undertaken by drive control part by switching on and off; Switching control mechanism, when the rotation of output shaft is restricted, with make this switching control mechanism action through the 1st driving gear and the corresponding load of the 2nd driving gear institute load transmitted torque, to be switched on or switched off switch, therefore, need not complicated circuit, promptly detect by simple structure and motor or the corresponding load torque of driving gear.
In addition, adopt the present invention, because switching control mechanism has the 1st stationary axle, the 2nd gear rotatably is installed on it, this switching control mechanism is installed on the 2nd stationary axle as the 3rd driving gear gyration center in rotating mode, it is the restriction that the rotation at center is subjected to elastomeric loading force with the 2nd stationary axle, and, when the rotation of output shaft is restricted, by with through the 1st driving gear and the corresponding load of the 2nd driving gear institute load transmitted torque, make the elastomer distortion, this switching control mechanism is that rotate to be switched on or switched off switch at the center with the 1st stationary axle with the 2nd stationary axle, therefore, can realize the detection of load torque with simple structure.
Description of drawings
Fig. 1 is the figure of structure of the motor-operated control valve of expression embodiment of the present invention 1.
Fig. 2 is the figure that is used for the action of explanatory drawing 1 arm.
Fig. 3 is the figure of structure of drive control part of the motor-operated control valve of expression mode of execution 1.
Fig. 4 is the figure of the another kind of example of structure of expression drive control part.
Fig. 5 be the expression stepper motor and corresponding output torque of driving current value and rotating speed between the coordinate diagram of relation.
Fig. 6 is the figure of the another kind of structure of expression limit switch control mechanism.
Fig. 7 is the figure of another structure of expression limit switch control mechanism.
Embodiment
Fig. 1 is the figure of structure of the motor-operated control valve of expression embodiment of the present invention 1, and for its internal structure is described, the axial section along the output shaft of electric execution element and the valve rod that is connected with this output shaft among the figure is represented partly.Among Fig. 1, expression has the electric execution element 1 and the valve body 2 of the motor-operated control valve that constitutes mode of execution 1, but has omitted the drive control part of electric execution element 1.In addition, the drive control part of electric execution element 1 will be explained in the back.
Electric execution element 1 has: be accommodated in support plate 5a, 5b in the housing; Be configured in the motor 3 on the support plate 5a; With the output shaft 4 that runs through support plate 5a, 5b and be provided with in the mode of the rotation of support plate 5a, 5b relatively; Limit switch 13; The arm 10 that limit switch 13 is switched on or switched off; The transmission of torque of motor 3 is arrived the gear unit of output shaft 4.
Motor 3 is not to export the high capacity motor of big torque, employing be can be by changing the stepper motor that rotating speed, supplying electric current or service voltage easily change the output torque.Support plate 5a and support plate 5b are configured in the housing with the spaced and parallel of regulation.The rotating shaft 9a of motor 3 runs through support plate 5a, on this rotating shaft 9a driving gear 6a is installed.The output shaft 4 of electric execution element 1 is connected with the valve rod 15 of the valve body 2 of the below that is installed in Fig. 1, and this output shaft 4 is by ball bearing 14 rotations.
Gear unit comprises: be installed in driving gear (the 1st driving gear) 6a on the rotating shaft 9a of motor 3, with the 6d of driving gear portion of driving gear 6a engagement, with the integrally formed 6e of driving gear portion of coaxial mode and the 6d of driving gear portion, to be installed in stationary axle (the 2nd stationary axle) 9b last and with the 6b of driving gear portion of the 6e of driving gear portion engagement, to form with the coaxial mode of the 6b of driving gear portion and the 6c of driving gear portion that rotates of one and the driving gear 7 that rotates with output shaft 4 one with it, stationary axle 9b wherein is formed on the support plate 5b.
The 6b of driving gear portion meshes than its little 6e of driving gear portion with diameter.And, in support plate 5b one side, diameter less than the 6c of driving gear portion of the 6b of driving gear portion with integrally formed with it with this 6b of driving gear portion coaxial manner.In addition, stationary axle 9b is formed on the support plate 5b, and the 6b of driving gear portion, 6c are can being that the mode of center rotation is installed on the stationary axle 9b with stationary axle 9b.The 6b of this driving gear portion, 6c constitute the 3rd driving gear.
The driving gear 6a engagement that the 6d of driving gear portion is less with the diameter on the rotating shaft 9a that is installed in motor 3.And, in support plate 5b one side, diameter less than the 6e of driving gear portion of the 6d of driving gear portion with integrally formed with it with the coaxial mode of the 6d of driving gear portion.In addition, the 6d of driving gear portion, 6e to be can being that the mode of center rotation is installed to be formed on stationary axle 8 (the 1st stationary axle) on the arm 10, and can be independent of arm 10 and rotate.The 6d of this driving gear portion, 6e constitute the 2nd driving gear.
The limit switch control mechanism comprises arm 10 and stationary axle 8, arm 10 is made of through wherein base portion 10a, the 10b of beam portion that connects base portion 10a and arm 10c, the arm 10c that presses limit switch 13 stationary axle 9b, and arm 10 can be that rotate at the center with stationary axle 9b at base portion 10a.On the 10b of beam portion, form stationary axle 8 and the 6d of driving gear portion, 6e are installed.
Arm 10c is passed in support plate 5a and goes up the through hole that is provided with, and outstanding outside support plate 5a, what be accompanied by arm 10 is the rotation at center with stationary axle 9b, and arm 10c presses limit switch 13.In addition, the edge of stationary axle 8 is formed with spring retainer 12 respectively perpendicular to the both sides of Fig. 1 paper direction, disposes helical spring 11 between this spring retainer 12 and stationary axle 8.
Limit switch 13 is located on the support plate 5a, and it can be pressed by moving of arm 10 and become on-state.Connecting and disconnecting corresponding to this limit switch 13, drive control part described later switches the output torque of motor 3, for example, is seated at the valve opening portion at spool 17, after valve becomes full-shut position, push the operation of spool 17 with the driving torque that is higher than common state.
Torque detection means comprises above-mentioned gear unit, arm 10 and limit switch 13, is seated at the valve opening portion at spool 17, and during the rotational lock of output shaft 4, this torque detection means detects the load torque more than the specified value that motor 3 or driving gear transmit.
In addition, the stop valve with the linear motion valve form in the example of Fig. 1 uses as valve body 2, and as shown in Figure 1, valve body 2 comprises: have the piece of stream 18,19 and the piece that valve rod 15 passes sliding eye 16.On the periphery of above-mentioned two attachment portion, carry packing ring (gasket) 21 and barrier film (diaphragm) back-up ring 22 of ring-type.In addition, by the discoideus barrier film 20 that is provided with through barrier film back-up ring 22, the inner space of two attachment portions is divided into by the space of spool 17 1 sides with by the space of valve rod 15 1 sides.
The upper end of valve rod 15 is connected with the output shaft 4 of electric execution element 1, follows the rotation of output shaft 4, and it slides along (among the figure) above-below direction in sliding eye 16.The lower end of valve rod 15 is equipped with spool 17, and the lower end periphery of this spool 17 is provided with sealed member 17a, and sealing parts 17a contacts with the seal ring 17b of valve opening portion when the valve full cut-off.Valve rod 15 is followed the rotation of output shaft 4 and lifting, and spool 17 opens or closes the valve opening portion as stream 18 opening ends.Thus, the control fluid is from stream 18 flowing to stream 19.
Run through on the valve rod 15 of sliding eye 16 in the mode of butt with it being provided with sealed member 23, sealed member 23 is being kept by the shaft supporting part 24 of ring-type.Shaft supporting part 24 is fixed on the shell (framework) of valve body 2 by lock screw 26, is arranged on O type circle 25 sealings on the periphery of shaft supporting part 24 between the inside of the fixed position of lock screw 26 and valve body 2.
In addition, near the underpart of the lower surface of shaft supporting part 24 and valve rod 15,27 pairs of upper and lower end of bellows of being made by stainless steel etc. are fixed.Seal between the part of leaning on sliding eye 16 sides of 27 pairs of valve rods 15 of this bellows and the inside of valve body 2.
Below, the action of present embodiment is described.
Fig. 2 is the figure of action that is used for the arm of explanatory drawing 1, the state when (a) expression valve mediates aperture among Fig. 2, and when (b) is illustrated in valve and is in full cut-off among Fig. 2, the state that limit switch is connected.In addition, Fig. 2 is the view of seeing from support plate 5b side of expression electric execution element 1 shown in Figure 1, in order easily to recognize internal structure, makes support plate 5b transparent, and the limit switch 13 on the support plate 5a is represented by dotted lines.In addition, to structure shown in Figure 1 suitably explanation in addition.
Before the valve full cut-off and when mediating aperture, the stationary axle 8 of the 6d of driving gear portion, 6e from two-side supporting, is in the neutral position shown in (a) among Fig. 2 by helical spring 11.At this moment, drive control part described later moves spool 17 by the high speed low torque as driving torque under the common state.In this case, the 6d of driving gear portion, 6e are the center rotation and transmit this torque that make output shaft 4 and valve rod 15 rotations, spool 17 moves to the direction of valve opening portion with stationary axle 8 according to the torque from motor 3.
Spool 17 progressively moves and is seated at the valve opening portion, makes valve become full-shut position, at this moment, the axial mobile limit that spool 17 arrives along valve rod 15, the rotation of output shaft 4 locked (being restricted) is accompanied therewith, and the rotation of driving gear 7 and the 6c of driving gear portion, 6b is also locked.Under this state, further the torque that loads just becomes and is sent to motor 3 or the load of driving gear (load) torque, when becoming specified value when above with the corresponding load of this load torque, may make excessive load be sent to motor 3 or driving gear.
Therefore, among the present invention, become the state of full cut-off at valve, behind the twist-lock of output shaft 4 or the 6b of driving gear portion, via driving gear 6a during to the 6d of driving gear portion, the further locked-in torque of 6e, by with the proportional load of this torque (load torque), making arm 10 is that rotate at the center along the direction of the arrow indication of the symbol A of (b) among Fig. 2 with stationary axle 9b.
At this moment, reaching the big specified value of the loading force of the helical spring 11 that supported of comparison stationary axle 8 when above with the corresponding load of load torque, accompany with it, stationary axle 8 makes helical spring 11 distortion (quilt is along the direction compression of the symbol B of (b) among Fig. 2), simultaneously, the 6d of driving gear portion, 6e are around the 6b of driving gear portion revolution rotation.
Like this, at the state of valve full cut-off,, offset by helical spring 11 distortion (compressive strain) with the corresponding load of load torque more than the specified value that is loaded behind the twist-lock of output shaft 4 or the 6b of driving gear portion.In other words, among the present invention, at the driving gear of valve full-shut position locking or to the load torque that motor loaded, can pass through the distortion of helical spring 11, promptly the displacement detecting of helical spring 11 arrives.
After this, along with the 6d of driving gear portion, 6e around stationary axle 9b revolution rotation, arm 10 runs through through hole 5c and the arm 10c that gives prominence to presses the switch part 13a of limit switch 13 further when the A direction moves to support plate 5a outside.Thus, the driving torque of drive control part described later when common switch to than higher driving torque, thereby can under the state of valve full cut-off, carry out spool 17 by the operation on the valve opening portion with suitable torque.
In addition, in the above description,, helical spring 11 is arranged for example, but, just be not only limited to helical spring as long as abide by purport of the present invention as the elastomer that arm 10 is supported.
Fig. 3 is the figure of structure of drive control part of the motor-operated control valve of expression mode of execution 1, and (a) expression comprises motor 3 in each interior structure, the structure of the vibrator circuit of (a) in (b) presentation graphs 3 among Fig. 3 among Fig. 3.Shown in (a) among Fig. 3, this drive control part has power circuit 28, sense of rotation control circuit 29, vibrator circuit 30 and field circuit 31.
As mentioned above, in the present embodiment 1, motor 3 uses is cheap and can be by changing the stepper motor that rotating speed, supplying electric current and service voltage easily change the output torque.Field circuit 31 inputs generate excitation signal from the driving power signal of power circuit 28, and this excitation signal carries out excitation to the field coil in the motor 3, thus drive motor 3.
Sense of rotation control circuit 29 generates the signal that the sense of rotation to rotating magnetic fields in the motor 3 limits, and this signal is outputed to field circuit 31.Thus, field circuit 31 be by can producing to motor 3 output and excitation signal from the rotating magnetic field of the corresponding sense of rotation of signal of sense of rotation control circuit 29, thereby motor 3 is rotated by desirable direction.
Vibrator circuit 30 generates the frequency signal of decision motor 3 rotating speeds and exports these signals to field circuit 31.Field circuit 31 is synchronously exported excitation signals to motor 3 with the frequency signal that comes self-oscillating circuit 30.Thus, motor 3 is to rotate with this frequency signal corresponding rotating speeds.
In addition, shown in (b) among Fig. 3, vibrator circuit 30 has two RC circuit 33a, 33b and switch 32, and this switch 32 switches among RC circuit 33a, the 33b one according to being switched on or switched off of limit switch 13.RC circuit 33a is connected in series resistance 34a and electric capacity 35a and the RC vibrator circuit that constitutes.In addition, RC circuit 33b is connected in series resistance 34b and electric capacity 35b and the RC vibrator circuit that constitutes, and its frequency of can vibrating is half a frequency signal of RC circuit 33a natural frequency.
In the motor-operated control valve of mode of execution 1, when valve was not in the aperture of full cut-off, the frequency signal that vibrates with RC circuit 33a made motor 3 make action.In other words, limit switch 13 is when (not pressed by the arm 10) state of disconnection, and switch 32 is selected RC circuit 33a, and RC circuit 33a imports the high high-frequency signal of natural frequency than RC circuit 33b in field circuit 31.
Field circuit 31 with from the synchronous mode of the frequency signal of the RC circuit 33a of vibrator circuit 30 input to motor 3 output excitation signals.Thus, motor 3 is to rotate with the frequency signal corresponding rotating speeds from RC circuit 33a.Torque under this rotating speed is used as limit switch 13 needed driving torque when common when driving spool 17 under the off state.
Be in the state of full cut-off at valve, when by arm 10 limit switch 13 being connected, in vibrator circuit 30, switch 32 switches to RC circuit 33b from RC circuit 33a and is connected.At this moment, to field circuit 31, import the low frequency frequency signal lower from RC circuit 33b than the natural frequency of RC circuit 33a.Field circuit 31 is synchronously exported excitation signals to motor 3 with the frequency signal that comes RC circuit 33b in the self-oscillating circuit 30.
Thus, motor 3 is to rotate with the frequency signal corresponding rotating speeds from RC circuit 33b.Under this rotating speed, the big driving torque of driving torque than limit switch 13 during for off state is delivered to output shaft 4 through gear unit, carry out from the valve full-shut position with spool 17 by action at the valve opening portion.
Fig. 4 is the figure of another kind of example of structure of drive control part of the motor-operated control valve of expression mode of execution 1.Drive control part shown in Figure 4 is structurally different with drive control part shown in Figure 3, it is 31 circuit from power circuit 28 to field circuit, comprise the branch road that links to each other with resistance R 1 and be the branch road that half resistance R 2 of resistance R 1 resistance links to each other, can select a branch road that conduct links to each other with field circuit 31 in two branch roads by switch 32a with resistance.
As shown in Figure 5, from the supplying electric current value of power circuit 28 when big, stepper motor generate with from the corresponding excitation signal of the current value of field circuit 31, export higher output torque, use the general performance of this stepper motor.When limit switch 13 became off state, switch 32a selected Zhi Luxiang field circuit 31 power supplies link to each other with resistance R 1, in case and limit switch 13 is switched on, then the switch 32a Zhi Luxiang field circuit 31 selecting to link to each other with resistance R 2 is powered.
Thus, when limit switch 13 is switched on, supply to the branch road that the electric current of field circuit 31 is flowed through and linked to each other with resistance R 2, increase to some extent during for off state than limit switch 13, and to motor 3 outputs and the corresponding excitation signals of this current value.Adopt such structure, also can carry out spool 17 by action from the valve full-shut position with the necessary big torque of driving torque when common when driving spool 17 to the valve opening portion.
In addition, drive control part of the present invention is not limited to Fig. 3 and structure shown in Figure 4, also can adopt the output torque that can change motor 3 and the structure of other form in the prior art of using.
Fig. 6 is the figure of another kind of structure of the control mechanism of expression limit switch.(a) is the view of seeing from the 6d of driving gear portion, 6e side among Fig. 6, and (b) is that a-a line along (a) among Fig. 6 dissects the partial sectional view that obtains to support plate, driving gear and arm among Fig. 6, and (c) is the plan view of seeing along the b direction of (a) among Fig. 6 among Fig. 6.
Shown in (b) among Fig. 6, the 6a1 of driving gear portion is arranged on the stationary axle 9 that forms on the support plate 5b, and can be that rotate at the center with stationary axle 9.In support plate 5b side, 6b1 of driving gear portion and the 6a1 of driving gear portion that diameter is less are integrally formed with coaxial manner.The driving torque of motor is transmitted in 6a1 of driving gear portion or the 6b1 of driving gear portion and not shown driving gear (gear that is equivalent to driving gear 6a among Fig. 1) engagement that is installed on the motor rotary shaft.In addition, the 6a1 of driving gear portion, 6b1 constitute the 1st driving gear.
In support plate 5b one side, 6c1 of driving gear portion and the 6f of driving gear portion that diameter is less are integrally formed with coaxial manner, and they are the center with stationary axle 9 and are independent of the 6a1 of driving gear portion, 6b1 and rotate.The driving torque of motor is transmitted in 6f of driving gear portion or the 6c1 of driving gear portion and not shown driving gear (gear that is equivalent to the driving gear 7 among Fig. 1) engagement that is installed on the output shaft to output shaft.In addition, the 6f of driving gear portion, 6c1 constitute the 3rd driving gear.
In support plate 5b one side, 6e of driving gear portion and the 6d of driving gear portion that diameter is less are integrally formed with coaxial manner, and they are the center with stationary axle 8 and are independent of arm 10 and rotate.6e of driving gear portion and the 6f of driving gear portion engagement are to the driving torque of output shaft side transmission motor.In addition, the 6d of driving gear portion, 6e constitute the 2nd driving gear.
Shown in (b) among Fig. 6, the base portion of arm 10 is can being that the mode that rotate at the center is installed around stationary axle 9.In addition, shown in (a) among Fig. 6, be formed with helical spring retainer 12 respectively, between helical spring retainer 12 and stationary axle 8, dispose helical spring 11 in stationary axle 8 left and right sides.Thus, when output shaft and the 6f of driving gear portion rotation, from two-side supporting, arm 10 is parked in the neutral position to stationary axle 8 by helical spring 11.
The upper end portion of stationary axle 8 (by the end of support plate 5a side) is applied in the last through hole 5c that forms of support plate 5a and is projected into outside the support plate 5a, is accompanied by the rotation of arm 10, and the switch part 13a of limit switch 13 is pressed in the upper end portion of this stationary axle 8.
Below, the action of present embodiment is described.
The torque that is produced by the rotation of not shown motor is used as the driving torque of spool, is passed to the 6a1 of driving gear portion earlier, is delivered to the 6d of driving gear portion through the 6b1 of driving gear portion with the rotation of the 6a1 of driving gear portion one then.Then, be delivered to the driving torque of the 6d of driving gear portion, be delivered to the 6f of driving gear portion, and then make the output shaft rotation through the 6e of driving gear portion with the rotation of this driving gear 6d one.
Along with the moving of spool, spool is seated at the valve opening portion and when making valve be full-shut position, valve rod reaches the mobile limit, and the rotation of output shaft is locked, accompanies therewith, and the rotation of the 6f of driving gear portion, 6c1 is locked.After this, from motor during to the 6f of driving gear portion, the further locked-in torque of 6c1, with the effect of the proportional load of this torque under, stationary axle 8 makes helical spring 11 distortion, simultaneously, arm 10 is that rotate at the center with stationary axle 9, and the 6d of driving gear portion, 6e are around the 6f of driving gear portion revolution rotation.
Follow the 6d of driving gear portion, 6e around the 6f of driving gear portion revolution rotation, arm 10 is moved further, and at this moment, shown in (c) among Fig. 6, runs through through hole 5c and the stationary axle 8 given prominence to is pressed the switch part 13a of limit switch 13 to support plate 5a outside.Thus, above-mentioned drive control part switches to bigger driving torque from conventional driving torque.Thus, under the state of valve full cut-off, carry out spool by operation to the valve opening portion with suitable torque.
In the illustration of Fig. 6, the stationary axle 8 of the 6d of driving gear portion, 6e has the function that makes the arm that limit switch 13 is switched on or switched off concurrently, compares with Fig. 1, structure shown in Figure 2, can realize the control function of limit switch with littler space.
In addition, illustratedly in the above description be, drive output shaft by the engagement between the 6f of driving gear portion or the 6c1 of driving gear portion and the not shown driving gear that is installed on the output shaft, but also can replace stationary axle 9 among Fig. 6 with output shaft, constitute the 6f of driving gear portion, 6c1 in mode with this output shaft one rotation, and, the 6a1 of driving gear portion, 6b1 and this output shaft and the 6f of driving gear portion, 6c1 are rotated independently, but the further saving of implementation space like this.
In addition, the control mechanism of limit switch can also be following structure.
Fig. 7 is the figure of another structure of expression limit switch control mechanism, (a) is the view of seeing from the 6d of driving gear portion, 6e side among Fig. 7, (b) is that c-c line along (a) among Fig. 7 dissects the partial sectional view that obtains to support plate, driving gear and arm among Fig. 7, and (c) is the figure that sees along the d direction of (b) among Fig. 7 among Fig. 7.In the illustration of Fig. 7, limit switch 13 is located on the support plate 5b.
Shown in (b) among Fig. 7, the 6a1 of driving gear portion is arranged on the stationary axle 9 that forms on the support plate 5b, and can be the center rotation with stationary axle 9.In support plate 5b one side, the less 6b1 of driving gear portion of diameter is integrally formed with coaxial manner and the 6a1 of driving gear portion.The driving torque of motor is transmitted in driving gear (with the suitable gear of driving gear 6a among Fig. 1) engagement on 6a1 of driving gear portion or the 6b1 of driving gear portion and the not shown turning axle that is installed in motor.In addition, the 6a1 of driving gear portion, 6b1 constitute the 1st driving gear.
In support plate 5b one side, the less 6c1 of driving gear portion of diameter is integrally formed with coaxial manner and the 6f of driving gear portion, and they can be gyration center and be independent of the 6a1 of driving gear portion, 6b1 and rotate with stationary axle 9.6f of driving gear portion or the 6c1 of driving gear portion and not shown be installed in driving gear on the output shaft (with the suitable gear of driving gear 7 among Fig. 1) engagement transmit the driving torque of motor to output shaft.In addition, the 6f of driving gear portion, 6c1 constitute the 3rd driving gear.
In support plate 5b one side, the less 6e of driving gear portion of diameter is integrally formed with coaxial manner and the 6d of driving gear portion, and they can be gyration center and be independent of arm 10 and rotate with stationary axle 8.6e of driving gear portion and the 6f of driving gear portion engagement are to the driving torque of output shaft transmission motor.In addition, the 6d of driving gear portion, 6e constitute the 2nd driving gear.
So far described structure is all identical with Fig. 6.
The base portion of arm 10 shown in Figure 7 to be installing around the mode that stationary axle 9 rotates, and is formed with the extending portion 10d that extends from base portion along self length direction on the arm 10.Corresponding to this extending portion 10d, shown in (c) among Fig. 7, the left and right sides is formed with spring retainer 12 respectively in the drawings, and disposes helical spring 11 between spring retainer 12 and extending portion 10d.Thus, when output shaft and the 6f of driving gear portion rotation, from two-side supporting, arm 10 is parked in the neutral position to extending portion 10d by helical spring 11.
In addition, the both sides of the abutting part 10e that forms on the end side along its length of arm 10 shown in (a) among Fig. 7, dispose limit switch 13 respectively.Thus, follow the rotation of arm 10, abutting part 10e presses the switch part 13a of limit switch 13.
Action to present embodiment describes below.
The driving torque that is used as spool by the torque that rotation produced of not shown motor is delivered to the 6a1 of driving gear portion, and after be delivered to the 6d of driving gear portion with the 6b of driving gear portion 1 of the 6a1 of driving gear portion one rotation.Then, the driving torque that is delivered to the 6d of driving gear portion is delivered to the 6f of driving gear portion through the 6e of driving gear portion with the rotation of the 6d of driving gear portion one, and makes the output shaft rotation.
Follow moving of spool, spool is seated at the valve opening portion and when making valve become full-shut position, valve rod arrives the mobile limit, and the rotation of output shaft is locked, accompanies with it, and the rotation of the 6f of driving gear portion, 6c1 is locked.Then, from motor during to the 6f of driving gear portion, the further locked-in torque of 6c1, with the proportional loading of this torque under, the extending portion 10d of arm 10 makes helical spring 11 distortion, arm 10 is that gyration center rotates with stationary axle 9, and the 6d of driving gear portion, 6e are around the 6f of driving gear portion revolution rotation.
Be accompanied by the 6d of driving gear portion, 6e around the 6f of driving gear portion revolution rotation, arm 10 is moved further, and shown in (b) among Fig. 7, the abutting part 10e of arm 10 presses the switch part 13a of limit switch 13.Thus, above-mentioned drive control part switches to higher driving torque from the driving torque of routine.Thus, under the valve full-shut position, can carry out spool by the operation on the valve opening portion with suitable torque.
In the illustration of Fig. 7, be not that limit switch 13 is set on support plate 5a, but with the approaching support plate 5b of arm 10 on configuration limit switch 13, with regard to each end of arm 10, one end is supported by helical spring 11, and the other end carries out the on or off operation of limit switch 13.With such structure, can realize simpler than the illustrative structure of Fig. 1, Fig. 2, more save the control mechanism of the limit switch in space.
In addition, illustratedly in the above-mentioned explanation be, 6f of driving gear portion or the 6c1 of driving gear portion and the not shown driving gear that is installed on the output shaft mesh and drive output shaft, but also can replace stationary axle 9 among Fig. 7 with output shaft, constitute the 6f of driving gear portion, 6c1 in mode with this output shaft one rotation, and be arranged to the 6a1 of driving gear portion, 6b1 relatively that this output shaft and driving gearshaft 6f, 6c1 rotate independently, thus, can further realize saving the space.
As mentioned above, adopt present embodiment 1, because in valve opening control, detection is added in the above load torque of specified value on the electric execution element 1, and, the driving torque of motor 3 is switched to low torque or high torque (HT) according to the testing result of this load torque, so, usually make valve event with low torque, but therefore the higher torque of torque in the time of also can switching to than usual as required, needn't use the bigger high capacity motor of output torque, not only the structure cheapness also can be sought miniaturization.In addition,, but detect the load torque that in the driving of spool 17, produces, switch driving torque in view of the above, can load necessary torque thus rightly because be not to switch driving torque by the position of spool.
In addition, adopt present embodiment 1, because valve body 2 adopts linear motion valve, when valve body 2 is the state of full cut-off, valve rod 15 reaches the mobile limit, and the rotation of output shaft 4 is limited, at this moment, to transmit the driving torque detection that comes from motor 3 and be load torque, therefore, can prevent that spool 17 is loaded excessive torque when the linear motion valve full cut-off, in addition, at preventing internal leakage, also can carry out necessary pressing operation to spool effectively.
In addition, adopt present embodiment 1, electric execution element 1 has driving gear 6a, the 2nd driving gear, the 3rd driving gear, limit switch 13 and the arm 10 as the 1st driving gear, and wherein, driving gear 6a transmits the driving torque of motor 3; The 2nd driving gear and driving gear 6a adjacency comprise and the 6d of driving gear portion of driving gear 6a engagement and the driving gear portion 6e coaxial and integrally formed with the 6d of driving gear portion; The 3rd driving gear comprises and the 6b of driving gear portion of the 6e of driving gear portion engagement and the driving gear portion 6c coaxial and integrally formed with the 6b of driving gear portion that the 3rd driving gear transmits the driving torque of motor 3 to output shaft 4 through the 6c of driving gear portion; Limit switch 13 is switched on or switched off by self, and control is switched by the torque that drive control part carries out; When arm 10 is restricted in the rotation of output shaft 4, with under the effect of driving gear 6a and the 6b of driving gear portion, the corresponding load of 6e institute load transmitted torque, move, be switched on or switched off limit switch 13.Thus, need not complicated circuit, promptly can detect the load torque that acts on motor 3 or driving gear that in aperture control, produces, and then switch driving torque with simple structure.
In addition, adopt present embodiment 1, has stationary axle 8 on the arm 10,6d rotatably is installed on this stationary axle 8 by driving gear portion, the 2nd driving gear that 6e constitutes, arm 10 is installed in rotating mode on the stationary axle 9b (or stationary axle 9), this stationary axle 9b is by the 6b of driving gear portion, 6c (the perhaps 6f of driving gear portion, 6c1) the gyration center of the 3rd driving gear of Gou Chenging, and, arm 10 be the restriction that the rotation of gyration center is subjected to the loading force of helical spring 11 with stationary axle 9b (perhaps stationary axle 9), and when the rotation of output shaft 4 is limited, arm 10 by with the corresponding load of load torque of coming through the 1st driving gear and the 2nd driving gear transmission, make helical spring 11 distortion, simultaneously, arm 10 is that gyration center rotates with stationary axle 8 with stationary axle 9b (or stationary axle 9), thereby arm 10 is switched on or switched off limit switch 13, thus, can realize the detection of load torque with simple structure.
In addition, illustrative in above-mentioned mode of execution 1 is to switch in the torque that valve carries out motor 3 during for full-shut position, but also can with the valve full-shut position under be switched on limit switch 13 mode in opposite directions of operation, be arranged on the limit switch 13 that is switched under the valve wide open state, and switch with the torque that being switched on or switched off of this limit switch 13 carried out motor 3.
In addition, the limit switch 13 that illustration has valve wide open and a valve full cut-off two condition in above-mentioned mode of execution 1 disposes in mode in opposite directions, but the sensor or the switch of the position of abutting part 10e on stationary axle 8 when detecting valve and mediating the aperture position or the arm 10 can be set also, torque control is carried out in the position of the stationary axle 8 when detection mediates aperture or the abutting part 10e of arm 10.

Claims (7)

1. motor-operated control valve, have valve body and electric execution element that valve opening is controlled by the driving of valve rod, wherein, the output shaft of this electric execution element is connected with above-mentioned valve rod, the driving torque that the motor rotation produces drives above-mentioned valve rod through above-mentioned output shaft, with this valve opening of controlling above-mentioned valve body, it is characterized in that also having:
Drive control part, its driving torque with above-mentioned motor switches to lower torque or higher torque;
Torque detection means, in above-mentioned valve opening control, its detection is carried in the above load torque of specified value on the above-mentioned electric execution element,
The load torque that above-mentioned drive control part detects according to above-mentioned torque detection means switches to lower torque or higher torque with the driving torque of above-mentioned motor.
2. motor-operated control valve as claimed in claim 1, wherein,
Above-mentioned valve body is a linear motion valve, and it has valve opening portion and the spool that is located at the valve rod end for the fluid inflow and outflow, and above-mentioned valve rod moves vertically, makes above-mentioned spool open or seal above-mentioned valve opening portion,
Above-mentioned torque detection means is full-shut position or full-gear in valve opening, when the rotation of above-mentioned output shaft is restricted, detect the driving torque of coming from the motor transmission and with it as load torque.
3. motor-operated control valve as claimed in claim 2 is characterized in that,
Above-mentioned torque detection means has:
Transmit the 1st driving gear of the driving torque of motor;
The 2nd driving gear, itself and above-mentioned the 1st driving gear adjacency, and with above-mentioned the 1st driving gear engagement;
The 3rd driving gear, itself and above-mentioned the 2nd driving gear mesh, and transmit the driving torque of above-mentioned motor to output shaft;
Switch, it is controlled the drive control part that carries out above-mentioned motor torque switching; And
Switching control mechanism when the rotation of above-mentioned output shaft is restricted, and makes its action through above-mentioned the 1st driving gear and the corresponding load of above-mentioned the 2nd driving gear load transmitted torque, to be switched on or switched off above-mentioned switch.
4. motor-operated control valve as claimed in claim 3 is characterized in that,
Above-mentioned switching control mechanism has the 1st stationary axle, the 2nd gear is mounted thereon in the mode of the 1st stationary axle rotation relatively, this switching control mechanism is installed on the 2nd stationary axle as above-mentioned the 3rd driving gear gyration center in rotating mode, its rotation that is the center with above-mentioned the 2nd stationary axle is subjected to the restriction of elastomeric loading force
When the rotation of output shaft is restricted, and make above-mentioned elastomer distortion through the 1st driving gear and the corresponding load of the 2nd driving gear institute load transmitted torque, above-mentioned switching control mechanism is that rotate at the center with above-mentioned the 2nd stationary axle, to be switched on or switched off switch.
5. electric execution element, its driving torque that produces by the rotation of motor makes the output shaft rotation,, it is characterized in that having with the control valve aperture:
Drive control part, its driving torque with above-mentioned motor switches to lower torque or higher torque;
Torque detection means, it detects the load torque more than the specified value that loads in above-mentioned valve opening control,
The load torque that above-mentioned drive control part detects according to above-mentioned torque detection means switches to lower torque or higher torque with the driving torque of above-mentioned motor.
6. electric execution element as claimed in claim 5 is characterized in that,
Above-mentioned torque detection means has:
Transmit the 1st driving gear of the driving torque of motor;
The 2nd driving gear, itself and above-mentioned the 1st driving gear adjacency, and with above-mentioned the 1st driving gear engagement;
The 3rd driving gear, itself and above-mentioned the 2nd driving gear mesh, and transmit the driving torque of above-mentioned motor to output shaft;
Switch, by being switched on or switched off, control is switched by the torque that drive control part carries out;
Switching control mechanism when the rotation of above-mentioned output shaft is restricted, and makes its action through above-mentioned the 1st driving gear and above-mentioned the 2nd driving gear from the corresponding load of the load torque as driving torque of above-mentioned motor transmission, to be switched on or switched off above-mentioned switch.
7. electric execution element as claimed in claim 6 is characterized in that,
Above-mentioned switching control mechanism has the 1st stationary axle, the 2nd gear is mounted thereon in the mode of the 1st stationary axle rotation relatively, this switching control mechanism is installed on the 2nd stationary axle as above-mentioned the 3rd driving gear gyration center in rotating mode, its rotation that is the center with above-mentioned the 2nd stationary axle is subjected to the restriction of elastomeric loading force
When the rotation of output shaft is restricted, and make above-mentioned elastomer distortion through the 1st driving gear and the corresponding load of the 2nd driving gear load transmitted torque, above-mentioned switching control mechanism is that rotate at the center with above-mentioned the 2nd stationary axle, to be switched on or switched off switch.
CN2007103021828A 2006-12-19 2007-12-18 Electric control valve and electric execution element Expired - Fee Related CN101205978B (en)

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