CN108730578A - Intelligent power saving permanent flow valve, constant current valve control system and its control method - Google Patents
Intelligent power saving permanent flow valve, constant current valve control system and its control method Download PDFInfo
- Publication number
- CN108730578A CN108730578A CN201810521855.7A CN201810521855A CN108730578A CN 108730578 A CN108730578 A CN 108730578A CN 201810521855 A CN201810521855 A CN 201810521855A CN 108730578 A CN108730578 A CN 108730578A
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- Prior art keywords
- damping
- track slot
- movable block
- upper movable
- sealing plate
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Classifications
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
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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
- F16K31/046—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor
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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
- F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
Intelligent power saving permanent flow valve, the permanent flow valve include outer cover, damping shell, damping member, connecting pipe, damping impeller, driving motor (built-in speed probe), connecting pole.Wherein damping shell is fixedly connected by connecting pole with connecting pipe, damping shell is columned shell, damping shell has a circular side panel, a circular side wall is protruded along circular side panel circumference, circular side wall has a fixed thickness, the above structure for damping shell forms a receiving cavity, for accommodating damping member.And outer cover cooperatively forms the cavity body structure of sealing with damping shell.
Description
Technical field
The present invention relates to a kind of intelligent power saving permanent flow valves, are suitable for different water occasions, such as family, hotel, hospital, public affairs
Residence.
Background technology
Traditional permanent flow valve generally use changes the mode of channel sized for controlling the flow of liquid, to ensure flow
Constant current, such as Chinese patent application 201621369909.5 discloses a kind of pressure limiting permanent flow valve, including valve body, valve body are equipped with
Pressure limiting chamber, inlet and outlet, pressure limiting chamber are respectively communicated with inlet and outlet；Pressure limiting intracavitary is provided with pressure limiting device and leads
To cylinder；Pressure limiting chamber is connected to water inlet by guide cylinder；Pressure limiting device activity in guide cylinder, and simultaneously seal closing pressure limiting chamber and
The other side of the same side of guide cylinder, pressure limiting chamber and guide cylinder is interconnected by changeable channel；When work, high pressure water effect limit
Pressure device makes changeable channel become smaller, and realizes and is depressured to high pressure water.
In addition, Chinese patent application 201510829458.2 discloses a kind of variable rate spring formula permanent flow valve, valve body includes
Columnar shell；It is fixed with baffle ring and fixed support successively inside the shell；Spool includes the guiding being fixed in fixed support
Bar；Guide rod passes through baffle ring center and is overlapped with the axis of shell；There are one can be along guide rod sliding for installation on the guide bar
Baffle；It is fixed with variable rate spring between the baffle and baffle ring；Variable rate spring one end is fixed with baffle, the other end and gear
Ring is fixed.When gap of the fluid of certain pressure by spring, pressure difference is generated, the differential pressure action is in variable rate spring one end
Baffle compresses variable rate spring, changes the chinky altitude of variable rate spring, ensure certain through-current capacity.
A kind of also 201420197369.1 permanent flow valve of Chinese patent application, including foreboard, back plate and several side plates, it is preceding
Plate, back plate and side plate form a cavity, are provided with import on foreboard, in several side plates, are set on one of side plate
It is equipped with outlet, remaining surface of side plate is smooth, and elastic baffle is fixed in back plate, is offered at the elastic baffle center logical
Cavity is divided into flow velocity adjusting cavity and flow channel for liquids by hole, the elastic baffle.
To sum up, in the prior art, for stationary flow flow, it is logical that flow is typically controlled by elastic recovery component
The cross section in road is freely set when needing to stablize water flow at one since the coefficient of elasticity of spring is changeless
When under value, above-mentioned technical proposal then can not achieve, and above-mentioned elastic component is arranged in water stream channel, causes the knot of pipeline
Structure is complicated, and flow field is complicated, causes flow instability, and is unfavorable for maintenance personal's repair.
Especially when required minimum water flow requirement is not achieved in water flow, above-mentioned technical proposal does not have water flow
Enhanced feature.
Invention content
In order to solve above-mentioned defect existing in the prior art, the present invention proposes a kind of intelligent power saving permanent flow valve.
The invention in a first aspect, the permanent flow valve include outer cover, damping shell, damping member, connecting pipe, damping leaf
Wheel, driving motor (built-in speed probe), connecting pole.
Wherein damping shell is fixedly connected by connecting pole with connecting pipe, and damping shell is columned shell, damping
Shell has a circular side panel, protrudes a circular side wall along circular side panel circumference, circular side wall has a fixed thickness, damping
The above structure of shell forms a receiving cavity, for accommodating damping member.And outer cover cooperatively forms sealing with damping shell
Cavity body structure.
The second aspect of the invention, wherein connecting pipe is possessed by one section of left side rectangular duct, one cylinder of intermediate section
The channel of seal cavity, right side section have one section of rectangular duct, and three sections of channels can be integrally formed, can also be segmented connection and
At.Wherein rectangular duct can also be arranged to the pipeline of other structures.Wherein the central shaft of cylindrical channel is located at rectangular duct
The side on the upper side of vertical direction, so that flow is rationally contacted with the damping impeller being contained in cylindrical channel so that damping impeller
It is rotated towards single direction.
Wherein there is damping impeller an impeller axle, damping impeller to be fixedly connected or be integrally formed with impeller axle, impeller axle
With the central axis of cylindrical channel, and impeller axle is rotatably supported on the both ends side wall of cylindrical channel, side wall
Plane be parallel to the flow direction of flow.
Impeller axle one end connects driving motor, and driving motor is fixed on the side wall of cylindrical channel one end.Impeller axle is another
One one end connects clutch, and impeller axle connects axis connection, it can be achieved that the synchronous of the two turns by clutch with damping member
It is dynamic.
The third aspect of the invention, damping member include shaft connecting seat, front apron, rear baffle, band track slot supporting rack, circle
Segmental arc, fluid channel, spring, left track slot, right track slot, upper movable block, lower fixed seat, band spindle motor, preceding sealing plate, after
Sealing plate.
The shaft connecting seat of damping member is fixedly connected with damping member connecting shaft, and damping member is with damping member connecting shaft
Rotation and rotate.
The third aspect of the invention, band track slot supporting rack consist of two parts, and end portion is U-shaped block objects, passes through U
Fluting among shape block objects forms left and right support arm, left support arm rest closely slot side plane on offer left track
Right track slot is offered in the plane of fluting side on slot, right support arm, left and right support arm upper end is provided with a circular arc
Shape block, arc-shaped block are connected with the arc-shaped inner wall of damping shell, can be with relative motion, upper movable block therebetween
Casting lug thereon is arranged in the centre position of rectangular parallelepiped structure, left and right ends, and the casting lug thereon of left and right ends is respectively embedded into left track slot, the right side
Track groove, to which upper movable block can move up and down in the fluting with track slot supporting rack.
The front/rear end of upper movable block is respectively arranged with preceding sealing plate, rear sealing plate, preceding sealing plate, rear sealing plate side
Plane is bonded with the front/rear end of upper movable block respectively, and preceding sealing plate, rear sealing plate lower end exceed the lower face of upper movable block.
Wherein lower fixed seat and upper movable block shape having the same and casting lug thereon, lower fixed seat is again by casting lug thereon
Embedded left track slot, right track slot, and can realize and be moved up and down in the fluting with track slot supporting rack.
Unlike upper movable block：The lower face centre position of lower fixed seat offers threaded hole, threaded hole with silk
The leading screw of thick stick motor is connected, and the lower face with track slot supporting rack is fixedly connected on spindle motor.To with spindle motor
Lower fixed seat is driven to move up and down by screw structure.
Band track slot supporting rack front/rear end is additionally provided with front apron, rear baffle, and front apron, rear baffle are located at band track slot and support
Frame lower portion, the setting make lower fixed seat be blocked, play the role of sealing.
The fourth aspect of the invention, is formed with a fluid channel between upper movable block and arc section, and fluid channel is convenient for
Fluid in damping shell passes through.
A spring is provided between lower fixed seat and upper movable block, the coefficient of elasticity of spring is arranged as required to, and is being moved up
Motion block lower face is additionally provided with support plate, and support plate is set to the left and right sides.In the initial state, support plate lower end and lower fixation
Seated connection touches.Under working condition, support plate lower end is far from lower fixed seat.
The intelligence control system of 5th aspect of the invention, permanent flow valve includes setting panel, clutch, driving motor, turns
Fast sensor, band spindle motor, controller is provided with panel, speed probe is connect as input terminal with controller, driving
Motor, clutch, band spindle motor are connect as output end with controller.
Description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is the structural schematic diagram of other side of the present invention.
Fig. 3-1 is the sectional view of the damping member of the present invention.
Fig. 3-2 is the sectional view along A-A of Fig. 3-1.
Fig. 4-1 is the damping member and impeller annexation figure of the present invention.
Fig. 4-2 is the partial enlarged view of Fig. 4-1.
Fig. 5-1 is the sectional view of the other direction of the damping member of the present invention.
Fig. 5-2 is the C-C of Fig. 5-1 to sectional view.
Fig. 6 is the explosive view of the damping member of the present invention.
Fig. 7 is the front view of the damping member of the present invention.
Fig. 8 is the control system frame diagram of the present invention.
Fig. 9 is the control method flow chart of the present invention.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and embodiments.
1, the overall structure of permanent flow valve：
Referring to Fig. 1,2, the permanent flow valve include outer cover 1, damping shell 2, damping member 3, connecting pipe 4, damping impeller 5,
Driving motor 6 (built-in speed probe 601), connecting pole 7.
Wherein damping shell 2 is fixedly connected by connecting pole 7 with connecting pipe 4, and damping shell 2 is columned shell,
Damping shell 2 has a circular side panel, protrudes a circular side wall along circular side panel circumference, circular side wall has a fixation thick
The above structure of degree, damping shell 2 forms a receiving cavity, for accommodating damping member 3.And outer cover 1 is matched with damping shell 2
Close the cavity body structure for forming sealing.
Wherein, for connecting pipe by one section of left side rectangular duct, one cylinder of intermediate section possesses the channel of seal cavity, right
Side section has one section of rectangular duct, and three sections of channels can be integrally formed, can also be segmented and be formed by connecting.Wherein rectangular duct also may be used
To be arranged to the pipeline of other structures.Wherein the central shaft of cylindrical channel is located at the side on the upper side of rectangular duct vertical direction, with
Just flow is rationally contacted with the damping impeller 5 being contained in cylindrical channel so that damping impeller 5 is rotated towards single direction.
Referring to attached drawing 4-1, wherein damping impeller 5 has an impeller axle 8, damping impeller 5 be fixedly connected with impeller axle 8 or
It is integrally formed, the central axis of impeller axle 8 and cylindrical channel, and impeller axle 8 is rotatably supported on cylindrical channel
Both ends side wall on, the plane of side wall is parallel to the flow direction of flow.
8 one end of impeller axle connects driving motor 6, and driving motor 6 is fixed on the side wall of cylindrical channel one end.Impeller axle
8 another one end connect clutches 801, and impeller axle 8 connect with damping member connecting shaft 802 by clutch 801, it can be achieved that
The synchronous rotation of the two.
Referring to attached drawing 3-1,4-1,6, the structure and connection relation of damping member 3 are further described.
Damping member 3 includes shaft connecting seat 9, front apron 11, rear baffle 12, band track slot supporting rack 10, arc section 13, stream
Body channel 14, spring 18, left track slot 19, right track slot 20, upper movable block 16, lower fixed seat 15, band spindle motor 17, it is preceding close
Sealing plate 21, rear sealing plate 22.
The shaft connecting seat 9 of damping member 3 is fixedly connected with damping member connecting shaft 802, and damping member 3 is with damping member
The rotation of connecting shaft 802 and rotate.
The internal structure of damping member 3 is further described in detail by Fig. 5-1- Fig. 7, band track slot supporting rack 10 is by two
It is grouped as, end portion is U-shaped block objects, and left and right support arm, left support are formd by the fluting among U-shaped block objects
Arm rest closely slot side plane on offer left track slot 19, offer the right side in the plane of fluting side on right support arm
Track groove 20 is provided with an arc-shaped block in left and right support arm upper end, and arc-shaped block connects with the damping arc-shaped inner wall of shell
Connection is touched, can be rectangular parallelepiped structure with relative motion, upper movable block 16 therebetween, the centre position setting of left and right ends is convex
Go out block 1601, the casting lug thereon 1601 of left and right ends is respectively embedded into left track slot 19, right track slot 20, to which upper movable block 16 can be with
It is moved up and down in the fluting with track slot supporting rack 10.
The front/rear end of upper movable block 16 is respectively arranged with preceding sealing plate 21, rear sealing plate 22, preceding sealing plate 21, rear sealing
One side plane of plate 22 is bonded with the front/rear end of upper movable block 16 respectively, and preceding sealing plate 21,22 lower end of rear sealing plate are beyond upper
The lower face of movable block 16.
Wherein lower fixed seat 15 and 16 shape having the same of upper movable block and casting lug thereon 1502, lower fixed seat 15 are same
It is embedded in left track slot 19, right track slot 20 by casting lug thereon 1502, and can be realized in the fluting with track slot supporting rack 10
It moves up and down.
Unlike upper movable block 16：Threaded hole is offered referring to the lower face centre position of Fig. 5-1 lower fixed seats 15
1501, threaded hole 1501 is connected with the leading screw 1701 with spindle motor 17, and band spindle motor 17 is fixedly connected on band track slot
The lower face of supporting rack 10.To drive lower fixed seat 15 to move up and down by screw structure with spindle motor 17.
Progress one, referring to Fig. 4-1,10 front/rear end of band track slot supporting rack is additionally provided with front apron 11, rear baffle 12, preceding
Baffle 11, rear baffle 12 are located at 10 lower portion of band track slot supporting rack, which makes lower fixed seat 15 be blocked, play sealing
Effect.
In addition, being formed with a fluid channel 14 between upper movable block 16 and arc section 13, fluid channel 14 is convenient for damping
Fluid in shell 2 passes through.
The concrete structure of damping member 3 is further described in detail by Fig. 7, between lower fixed seat 15 and upper movable block 16
It is provided with a spring, the coefficient of elasticity of spring is arranged as required to, and support plate 17 is additionally provided in 16 lower face of upper movable block, branch
Fagging is set to the left and right sides.In the initial state, 17 lower end of support plate is contacted with lower fixed seat 15.Under working condition, support
17 lower end of plate is far from lower fixed seat 15.
2, the intelligence control system of permanent flow valve.
The intelligence control system of permanent flow valve includes setting panel 100, clutch 801, driving motor 6, speed probe
601, band spindle motor 17, controller 200 are provided with panel 100, speed probe 601 is used as input terminal and controller 200
Connection, driving motor 6, clutch 801, band spindle motor 17 are connect as output end with controller 200.
3, the operation principle of permanent flow valve.
The water velocity n0 that first step setting needs, calculates rotating speed kn0 according to water velocity n0, passes through speed probe
The rotating speeds of 601 pairs of damping impellers are monitored, and controller according to water velocity n0 by band spindle motor 17 by lower fixation
15 setting of seat determines that position, the position are obtained by testing one, and the position is corresponding with water velocity n0；
Stop driving when (t0 takes 20s) is more than n0 to actual water velocity within the t0 times and in driving motor 6
In the case of, the rotating speed of damping impeller 5 is more than kn0, and controller 200 controls clutch 801 and engages at this time, at this time impeller axle 8 and resistance
Buddhist nun's component connecting shaft 802 rotates synchronously.Damping mechanism 3 rotates at this time, and upper movable block 16 also begins to rotate, due to the work of centrifugal force
With upper movable block 16 leads to 14 opening section of fluid channel far from lower fixed seat 15, upper movable block 16 close to arc section 13
Reduce, due to the section reduction by fluid, the damping that damping member 3 is subject to increases, and reduces to damp 5 rotating speed of impeller, most
Too fast water velocity is stablized in n0 at last.
Stop driving when water velocity is less than n0 in lasting t1 (t1 can use 10s) range and in driving motor 6
In the case of, the rotating speed that speed probe 601 detects at this time is less than kn0 within the scope of lasting 10s, passes through controller at this time
200 cut-off clutches 801, damping member 3 are detached from damping impeller 5, and driving motor 6 is rotated with n0 rotating speed band dynamic dampings impeller 5,
And duration t2 (t2 is 3 minutes desirable), then stops driving driving motor 6, judges actual water velocity at this time and turns
The size of fast n0.
Above-mentioned control system can carry out reduction of speed by damping mechanism to flow, can also be carried to flow by motor
Speed, and due to being that joint damping mechanism controls flow with motor, which has intelligent flow stabilizing and saving
The effect of electric energy.
Claims (5)
1. intelligent power saving permanent flow valve, which is characterized in that the permanent flow valve includes damping accommodating chamber, damping member, connecting pipe, damping
Impeller, damping impeller are rotatably coupled in the connecting pipe, and the damping impeller shaft is fixedly connected with damping member,
The damping member is rotatably contained in the damping accommodating chamber, and damping liquid, damping are full of in the damping accommodating chamber
Component includes a fluid channel, and the overflow section of the fluid channel is adjustable, damping member include shaft connecting seat, front apron,
Rear baffle, band track slot supporting rack, arc section, fluid channel, spring, left track slot, right track slot, upper movable block, lower fixed seat,
Band spindle motor, preceding sealing plate, rear sealing plate, band track slot supporting rack consist of two parts, and end portion is U-shaped block objects,
Form left and right support arm by the fluting among U-shaped block objects, left support arm rest closely slot side plane on offer
Right track slot is offered in the plane of fluting side on left track slot, right support arm, is provided in left and right support arm upper end
One arc-shaped block, arc-shaped block are connected with the arc-shaped inner wall of damping shell, can be moved up with relative motion therebetween
Motion block is rectangular parallelepiped structure, and casting lug thereon is arranged in the centre position of left and right ends, and the casting lug thereon of left and right ends is respectively embedded into left rail
Road slot, right track slot, to which upper movable block can move up and down in the fluting with track slot supporting rack.
2. intelligent power saving permanent flow valve according to claim 1, which is characterized in that further include：Driving motor, in driving motor
Speed probe, driving motor driving damping wheel rotation are set, the damping impeller is connect with damping member by clutch.
3. intelligent power saving permanent flow valve according to claim 2, which is characterized in that the front/rear end of upper movable block is respectively set
Have preceding sealing plate, a rear sealing plate, preceding sealing plate, rear sealing plate a side plane be bonded respectively with the front/rear end of upper movable block,
Preceding sealing plate, rear sealing plate lower end exceed the lower face of upper movable block, and wherein lower fixed seat and upper movable block is having the same outer
Shape and casting lug thereon, lower fixed seat can be realized again by casting lug thereon insertion left track slot, right track slot in band track slot
It is moved up and down in the fluting of supporting rack.
4. constant current valve control system, which is characterized in that it includes the intelligent power saving permanent flow valve described in claim 3, the permanent flow valve
Control system includes setting panel, clutch, driving motor, speed probe, band spindle motor, and controller is provided with face
Plate, speed probe are connect as input terminal with controller, and driving motor, clutch, band spindle motor are as output end and control
Device connection processed.
5. the control method of constant current valve control system, which is characterized in that including the constant current valve control system described in claim 6,
Step 1, the water velocity n0 that first step setting needs, calculates rotating speed kn0 according to water velocity n0, passes through revolution speed sensing
Device is monitored the rotating speed for damping impeller, and controller is set lower fixed seat by band spindle motor according to water velocity n0
It sets and determines that position, the position are obtained by testing one, the position is corresponding with water velocity n0；
Step 2, when being more than n0 within the t0 times when actual water velocity, the clutch of controller control at this time engages, at this time leaf
Wheel shaft is rotated synchronously with damping member connecting shaft, and damping mechanism rotates at this time, and upper movable block also begins to rotate, due to centrifugal force
Effect, for upper movable block far from lower fixed seat, upper movable block causes fluid channel opening section to reduce close to arc section, by
In the section reduction by fluid, the damping that damping member is subject to increases, and reduces to damp wheel speed, finally will be too fast
Water velocity is stablized in n0, when actual water velocity is less than or equal to n0 within the t0 times, executes step 3；
Step 3, when being less than n0 within the scope of lasting t1 when water velocity, at this time by controller cut-off clutch, structure is damped
Part and damping impeller are detached from, and driving motor is with n0 rotating speed band dynamic damping wheel rotations, and duration t2, then stopping drive
Then driving motor executes step 2；When water velocity is more than or equal to n0 within the scope of lasting t1, step 2 is executed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810521855.7A CN108730578B (en) | 2018-05-29 | 2018-05-29 | Intelligent power-saving constant-current valve, constant-current valve control system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810521855.7A CN108730578B (en) | 2018-05-29 | 2018-05-29 | Intelligent power-saving constant-current valve, constant-current valve control system and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108730578A true CN108730578A (en) | 2018-11-02 |
| CN108730578B CN108730578B (en) | 2023-09-22 |
Family
ID=63935576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810521855.7A Active CN108730578B (en) | 2018-05-29 | 2018-05-29 | Intelligent power-saving constant-current valve, constant-current valve control system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108730578B (en) |
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2018
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| CN102016346A (en) * | 2008-04-28 | 2011-04-13 | 奥依列斯工业株式会社 | Damper and vehicle seat comprising the same |
| CN103672100A (en) * | 2012-09-17 | 2014-03-26 | 昆山尚达智机械有限公司 | Novel speed control valve |
| CN203857098U (en) * | 2014-05-15 | 2014-10-01 | 青岛海尔空调器有限总公司 | Air conditioner depressurizing device and air conditioner |
| CN205806787U (en) * | 2016-07-18 | 2016-12-14 | 长沙矿山研究院有限责任公司 | A kind of filling slurry pipeline drag device |
| CN206409714U (en) * | 2016-12-28 | 2017-08-15 | 天津赛创自动化控制技术有限公司 | A kind of valve electric actuator with hand automatic switching function |
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| Publication number | Publication date |
|---|---|
| CN108730578B (en) | 2023-09-22 |
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