CN209671676U - Slide valve gear - Google Patents
Slide valve gear Download PDFInfo
- Publication number
- CN209671676U CN209671676U CN201920280537.6U CN201920280537U CN209671676U CN 209671676 U CN209671676 U CN 209671676U CN 201920280537 U CN201920280537 U CN 201920280537U CN 209671676 U CN209671676 U CN 209671676U
- Authority
- CN
- China
- Prior art keywords
- spool
- slide valve
- valve gear
- piezoelectric element
- axial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000006073 displacement reaction Methods 0.000 claims abstract description 34
- 239000012530 fluid Substances 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 6
- 239000003921 oil Substances 0.000 description 38
- 230000005540 biological transmission Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000005483 Hooke's law Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Sliding Valves (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
- Multiple-Way Valves (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Slide valve gear is provided, can precisely detect the displacement of spool without the use of magnet and Hall element.Slide valve gear (1) includes shell (10), with spool bore (20)；Spool (30) is configured to axially displaced in spool bore (20)；Elastomeric element (40) is configured at the axial one end side of spool (30) in spool bore (20), and the other side exerts a force to spool (30) in the axial direction；Piezoelectric element (50) is fixed relative to shell (10), is contacted with the axial one end of elastomeric element (40)；And voltage-displacement converter section (60), the variation of the voltage generated in piezoelectric element (50) is converted to the displacement of spool (30).
Description
Technical field
The utility model relates to slide valve gears.
Background technique
In the past, the stroke sensor installed in slide valve has test section in the outside of slide valve, makes the measurement as detection
The axis of element is resisted against spool, which slides axially, and is carried out according to the power of the magnetic flux density for the magnet being mounted on an axle
Stroke detection (referring to Japanese Unexamined Patent Publication 11-44367 bulletin).
Since stroke detection portion is seperated with slide valve, the volume of device is caused to increase.Further, since using Hall element
Come detect magnet magnetic flux density variation, therefore the metal powder generated due to pollution is attracted by magnet, thus detection accuracy
Generate deviation.
Utility model content
In view of the foregoing, one of its goals is to provide the position that can precisely detect spool to the utility model
Slide valve gear of the shifting amount without the use of magnet and Hall element.
The first method of the utility model provides a kind of slide valve gear, which is characterized in that and the slide valve gear includes shell,
It is with spool bore；Spool is configured to axially displaced in the spool bore；Elastomeric element, in the spool
The axial one end side of the spool is configured in hole, the other side exerts a force to the spool in the axial direction；Piezoelectric element, relative to
The shell is fixed, and is contacted with the axial one end of the elastomeric element；And voltage-displacement converter section, it will be described
The variation of the voltage generated in piezoelectric element is converted to the displacement of the spool.
The slide valve gear of the second method of the utility model is characterized in that, described in the slide valve gear of first method
Piezoelectric element is configured in the spool bore.
The slide valve gear of the Third Way of the utility model is characterized in that, is filled in the slide valve of first method or second method
In setting, the slide valve gear also has offer to from fluid to the spool bore or controls from the discharge in the spool bore
The control unit of system, the voltage-displacement converter section are electrically connected with the control unit.
The slide valve gear of the fourth way of the utility model is characterized in that, described in the slide valve gear of first method
Elastomeric element is made of helical spring.
The slide valve gear of 5th mode of the utility model is characterized in that, in the slide valve gear of fourth way, in institute
The axial one end for stating spool has recess portion, is accommodated with the axial end side of the helical spring within the recess.
The slide valve gear of 6th mode of the utility model is characterized in that, described in the slide valve gear of first method
Slide valve gear also has the prevention releasing part for being installed on the shell, which prevents the spool, the bullet
Property component and the piezoelectric element fall off from the spool bore, and the piezoelectric element passes through by the elastomeric element and the resistance
Only releasing part is clamped and is fixed relative to the shell.
According to the utility model, the displacement of spool can be precisely detected without the use of magnet and Hall element.
Detailed description of the invention
Fig. 1 is the enlarged view of the main part of the slide valve gear of present embodiment.
Fig. 2 is the integrally-built explanatory diagram of the slide valve gear of present embodiment.
Fig. 3 is the integrally-built explanatory diagram of the slide valve gear of present embodiment.
Label declaration
1: slide valve gear；10: shell；20: spool bore；30: spool；40: elastomeric element；50: piezoelectric element；60: voltage-
It is displaced converter section；70: control unit；90: preventing releasing part.
Specific embodiment
Hereinafter, being illustrated referring to embodiment illustrated of the attached drawing to the utility model.In addition, in this application, it will
Direction along the central axis of spool is known as " axial direction ".In addition, axially, using the open side of spool bore as " opening
Side " is illustrated the shape and positional relationship of each section using its opposite side as " closed side ".In each figure of the application
In, " open side " and " closed side " are shown with arrow.
The structure > of < slide valve gear
Firstly, being illustrated referring to figs. 1 to structure of the Fig. 3 to the slide valve gear 1 of an embodiment of the utility model.
Fig. 1 is the enlarged view of the main part of the slide valve gear of present embodiment.Fig. 2 is the overall structure of the slide valve gear of present embodiment
Explanatory diagram.Fig. 3 is the integrally-built explanatory diagram of the slide valve gear of present embodiment.
The transporting equipment such as being equipped on automobile of slide valve gear 1 is provided by the stepless transmission into transporting equipment
Oily (Automatic Transmission Fluid (automatic transmission fluid): ATF) and the driving of stepless transmission is controlled
The device of system.As shown in Figure 1, slide valve gear 1 has shell 10, spool bore 20, spool 30, elastomeric element 40, piezoelectric element 50
And voltage-displacement converter section 60.
Shell 10 is in the internal metal valve body (hereinafter, shell is known as " valve body ") with multiple flow paths 22.In
In present embodiment, as the fluid flowed in flow path 22, the oil such as lubricating oil are used (hereinafter, flow path is known as " oil
Road ").Multiple oil circuits 22 intricately interlock in the inside of valve body 10.Valve body 10 is by by muti-piece (such as 2~3 pieces) substantially plate
The component of shape vertically laminated multi-layer and constitute.Multiple components for example ands carrying out that screw is fixed etc. in the stacking direction each other
It is fixed up.The all parts for constituting valve body 10 are, for example, to be formed and carrying out die casting to metals such as aluminium alloys.In addition, In
A part of valve body 10 is shown in Fig. 1.
Spool bore 20 is columned space, is set in valve body 10.Spool bore 20 is connected with multiple oil circuits 22.Spool bore
The 20 axially inside extension from the side for the component for constituting valve body 10 towards the component.
As shown in Figures 2 and 3, in the present embodiment, signal oil circuit 23, input oil circuit 24, output circuit 25 and row
This four oil circuits 22 of vent line 26 are connected with spool bore 20.Signal oil circuit 23 is connect with the most inboard end of spool bore 20.Letter
Number oil circuit 23 is for providing the oil circuit of signal pressure to aftermentioned spool 20, which is directed towards the pressure of axially open side.
The oil pump with the outside for being set to valve body 10 via the solenoid valve 71 of other positions setting in valve body 10 of signal oil circuit 23
72 are connected.
Input oil circuit 24 is connected to than signal oil circuit 23 by the position of the open side of spool bore 20.Output circuit 25 is connected to
Than input oil circuit 24 by the position of the open side of spool bore 20.In addition, discharge oil circuit 26 is connected to than output circuit 25 by spool
The position of the open side in hole 20.
Spool 30 is arranged in the columned component of abnormity in spool bore 20.Spool 30 is from the open side edge of spool bore 20
It is axial to extend to closed side.Spool 30 includes large-diameter portion 31, has the outer diameter roughly equal with the internal diameter of spool bore 20；With
And small diameter portion 32, there is the outer diameter smaller than large-diameter portion 31.The axial one end side of spool 30 to the open side of spool bore 20,
With recess portion 33.The material of spool 30 is for example used in the same manner the metals such as aluminium alloy with valve body 10.
Elastomeric element 40 is configured at the axial one end side of the spool 30 in spool bore 20, in the axial direction the other side (closed side)
It exerts a force to spool 30.Elastomeric element 40 is for example made of helical spring (hereinafter, elastomeric element is known as " helical spring ").Scheming
In the state of 2, axial end side (the axial closing side of helical spring 40 is at least accommodated in the recess portion 33 of spool 30
Portion).Helical spring 40 is configured in spool bore 20 with being axially relative to the compressed state of natural length.Therefore, spool
30 always from helical spring 40 by the reaction force towards axial closing side.In addition, the position of spool 30 open side in the axial direction
It is displaced more, helical spring 40 is compressed more, therefore the reaction force that spool 30 is subject to from helical spring 40 is bigger.
Piezoelectric element 50 is the element that will be voltage V to the pressure conversion that piezoelectrics apply, also referred to as piezo element.
As the construction of piezoelectric element 50, based on the element for clipping piezoelectrics with two electrodes, unimorph electricity can be enumerated
Pole, bimorph and laminated type etc..Piezoelectric element 50 is fixed relative to valve body 10.The axial one end of helical spring 40
It is contacted with piezoelectric element 50.The piezoelectric element 50 of present embodiment is configured in spool bore 20, but matching about piezoelectric element 50
Seated position is not limited in spool bore 20 as long as can contact with the axial one end of helical spring 40.
Here, piezoelectric effect refer to generated when applying pressure to substance the polarization (surface charge) proportional to pressure this
One phenomenon.Piezoelectric effect is stated with the binary simultaneous equations of referred to as piezoelectricity fundamental equation.According to taking which physical quantity makees
Four kinds of forms are obtained for independent variable.If strain is S, if electric flux density is D (cm/m2), then with stress T (N/m2) and electric field E
(V/m) it is used as independent variable, piezoelectricity fundamental equation is expressed as.
(mathematical expression 1)
S=SET+dtE
(mathematical expression 2)
D=dT+εTE
Wherein, SE: elastic compliance constant (m2/ N), εT: dielectric constant (F/m), the symbol in the upper right corner indicate that the physical quantity is
Value under certain condition.In addition, dtIt is referred to as piezoelectric constant with d, is the coefficient in conjunction with mechanical effect and electrical effect.dtList
Position is C/N.If piezoelectric constant dtIt is 0 with d, then the statement of the situation independent as mechanical phenomenon and electrical phenomena.
(mathematical expression 3)
S=SET (Hooke's law)
(mathematical expression 4)
D=εTE
Since electricity physical quantity is stated with vector (1 rank tensor), mechanical physical quantity is with 2 rank tensors come table
The piezoelectric constant stated, therefore combined them is indicated with 3 rank tensors.That is, there are 27 independent components, but
Since the isolated component of shear stress (and shear strain) is 3, and there are symmetry for crystallization, therefore actually piezoelectric constant
Isolated component want much less.
Slide valve gear 1 also has the prevention releasing part 90 for being installed on valve body 10.The prevention releasing part of present embodiment
90 are made of (hereinafter, releasing part will be prevented to be known as " holding member ") holding member.The holding member 90 prevents spool 30, spiral shell
Rotation spring 40 and piezoelectric element 50 fall off from spool bore 20.Piezoelectric element 50 by helical spring 40 and holding member 90 by being pressed from both sides
It holds and fixes (positioning) relative to valve body 10.
The cover 11 of resin is for example provided in the opening portion of spool bore 20 21.Holding member 90 also has limitation lid
The function that component 11 makes a relative move relative to valve body 10.Holding member 90 is relative to valve body 10 and 11 both sides of cover under
It is inserted upwardly into.Holding member 90 is formed such as the metal as aluminium alloy.In valve body 10, set in the upper side and lower side of spool bore 20
It is equipped with a pair of of through hole 12,13 up and down.
In addition, the lower end of holding member 90 is along axial buckling.Holding member 90 is being inserted in it in through hole 12,13
Afterwards, in the other component (not shown) of the lower section of holding member 90 configuration valve body 10.Thus, it is therefore prevented that holding member 90 is downwards
It falls off.
Voltage-displacement converter section 60 is that the variation for the voltage V that will be generated in piezoelectric element 50 is converted to the position of spool 30
The displacement sensor of shifting amount.Voltage-displacement converter section 60 is for example with resistor, capacitor and cumulative portion.In the voltage-position
Move in converter section 60, be converted to the impedance with resistor, the time constant determined by the capacitor of capacitor and piezoelectric element 50, with
And the proportional voltage of displacement and output, cumulative portion determined to the pressure that piezoelectric element 50 applies carries out output voltage tired
Product is to calculate displacement.The voltage of present embodiment-displacement converter section 60 is set on cover 11, but also can be set in valve
On body 10.Piezoelectric element 50 is electrically connected with voltage-displacement converter section 60.
Slide valve gear 1 also has to offer of the fluid into spool bore 20 or controls from the discharge in spool bore 20
Control unit 70.Voltage-displacement converter section 60 is electrically connected with control unit 70.Control unit 70 is electrically connected with solenoid valve 71.
When solenoid valve 71 is open, oil is provided from oil pump 72 to signal oil circuit 23.
The movement > of < slide valve gear
Next, being illustrated referring to Fig. 2 and Fig. 3 to the movement of the slide valve gear 1 of present embodiment.Such as Fig. 2 and Fig. 3 institute
Show, spool 30 is positioned by the signal pressure of oil and the reaction force of helical spring 40.But it is even if identical being applied with
In the case where signal pressure, also due to individual difference of the spring constant of helical spring 40 etc. and cause the position of spool 30 to generate
Small difference.In addition, the flow of the oil exported also changes when the position of spool 30 minutely changes.Therefore, at this
In slide valve gear 1, actual measurement control is carried out to the axial position of spool 30 using piezoelectric element 50 and voltage-displacement converter section 60
System.
Control is opened and closed to solenoid valve 71 by control unit 70.It is provided when solenoid valve 71 is open to signal oil circuit 23
When oily, the signal pressure towards axially open side is applied to spool 30.Mode of operation, fortune corresponding to the gear lever in transporting equipment
The speed of transfer device, the various conditions such as revolving speed of engine, adjust electromagnetism according to the driving current provided from control unit 70
The aperture of valve 71.By adjusting the aperture of control unit 70, the signal pressure applied to spool 30 changes.Spool 30 is positioned
In the signal pressure of the oil position equal with the reaction force of helical spring 40.
When the axial position of spool 30 changes, input oil circuit 24, output circuit 25 and discharge 26 phase of oil circuit
Mutual connection status changes.For example, in a state of fig. 2, discharge oil circuit 26 and 25 orphan of input oil circuit 24 and output circuit
It is vertical.Moreover, input oil circuit 24 and output circuit 25 are via the notch 34 and small diameter portion 32 being arranged on the large-diameter portion 31 of spool 30
Around space and communicate with each other.Therefore, in a state of fig. 2, enter output circuit 25 from the oil stream that input oil circuit 24 imports,
And it is provided to the stepless transmission as control object.
In Fig. 2, spool 30 is configured at the closed side of spool bore 20 by the reaction force of helical spring.The spiral shell of Fig. 2
Rotation spring 40 is in elongation state, therefore the reaction force of helical spring 40 is smaller than compressive state, applies to piezoelectric element 50
It loads small.The load transfer is the voltage V proportional to the pressure applied to piezoelectrics by piezoelectric element 50.In piezoelectric element 50
The voltage V of middle generation inputs to voltage-displacement converter section 60, and input voltage V is converted to spool 30 by voltage-displacement converter section 60
Displacement.
In the state of Fig. 3, input oil circuit 24 and output circuit 25 and discharge oil circuit 26 isolate.Moreover, output circuit 25
And discharge oil circuit 26 is via the space around the notch 34 and small diameter portion 32 being arranged on the large-diameter portion 31 of spool 30 and each other
Connection.Therefore, in the state of Fig. 3, enter to be discharged oil circuit 26 from stepless transmission to the oil stream that output circuit 25 is returned, and from row
Vent line 26 is discharged to outside.
In Fig. 3, the reaction force of oil pressure counter helical spring, so that spool 30 is configured at the open side of spool bore 20.
Since helical spring 40 is in compressive state, the reaction force of helical spring 40 is bigger than elongation state, to piezoelectric element 50
The load of application is big.The load transfer is the voltage V proportional to the pressure applied to piezoelectrics by piezoelectric element 50.In piezoelectricity
The voltage V generated in element 50 inputs to voltage-displacement converter section 60, and voltage-displacement converter section 60 is converted to input voltage V
The displacement of spool 30.In addition, in this state, helical spring 40 whole (entirety in axial direction) is incorporated in the recessed of spool 30
In portion 33.
As discussed above, in the slide valve gear 1 of present embodiment, helical spring 40 is another in the axial direction by spool 30
One end (closed side) pressing.The axial one end (opening side end) of helical spring 40 is contacted with piezoelectric element 50.When from spiral shell
When revolving spring 40 to the application load of piezoelectric element 50, piezoelectric element 50 generates the voltage V proportional to pressure.Voltage-displacement turns
Change the displacement that the variation of the voltage generated in piezoelectric element 50 is converted to spool 30 by portion 60.Therefore, according to this embodiment party
The slide valve gear 1 of formula can precisely detect the displacement of spool without the use of magnet and Hall element.
In addition, the slide valve gear 1 of present embodiment also has to offer of the oil into spool bore 20 or out of spool bore 20
The control unit 70 that is controlled of discharge.Voltage-displacement converter section 60 is electrically connected with control unit 70.It therefore, will be by piezoelectricity
The displacement for the spool 30 that element 50 and voltage-displacement converter section 60 detect is supplied to control unit 70, so as to improve
The detection accuracy of the displacement of spool 30.
Moreover, the slide valve gear 1 of present embodiment also has holding member 90 as prevention releasing part.Piezoelectric element 50
Valve body 10 is fixed on and being clamped by helical spring 40 and holding member 90.Therefore, it can prevent even if to piezoelectric element 50
It is applied with the reaction force of helical spring 40 and piezoelectric element 50 also falls off from spool bore 20.In addition, elastomeric element 40 is by spiral
Spring is constituted, therefore versatility is good.
The implementation described above is for ease of understanding the utility model, is not to limit the utility model
It is fixed to explain.Each element and its configuration, material, condition, shape and size that embodiment has etc. are not limited to illustrate, can
Suitably change.Furthermore it is possible to partly displace or combine the structure shown in various embodiments each other.
In the above-described embodiment, using the stepless transmission of transporting equipment as control object, but the utility model
Slide valve gear 1 can also be using the automatic transmission other than stepless transmission as control object.In addition, the slide valve of the utility model
Device can also be using the equipment other than the automatic transmission controlled by oil as control object.
In addition, in the above-described embodiment, spool is displaced in the horizontal direction in, but posture when using slide valve gear
In, the direction of displacement of spool is not necessarily horizontal direction.
Moreover, the part other than the structure important document of the utility model of slide valve gear is not particularly limited.In addition, valve body,
The shape of the detail sections such as spool can also be different from shape shown in each figure of the application.
Claims (6)
1. a kind of slide valve gear, which is characterized in that
The slide valve gear includes
Shell, with spool bore；
Spool is configured to axially displaced in the spool bore；
Elastomeric element is configured at the axial one end side of the spool in the spool bore, and the other side is to described in the axial direction
Spool force；
Piezoelectric element is fixed relative to the shell, is contacted with the axial one end of the elastomeric element；And
The variation of the voltage generated in the piezoelectric element, is converted to the displacement of the spool by voltage-displacement converter section
Amount.
2. slide valve gear according to claim 1, which is characterized in that
The piezoelectric element is configured in the spool bore.
3. slide valve gear according to claim 1 or 2, which is characterized in that
The slide valve gear also has offer to from fluid to the spool bore or controls from the discharge in the spool bore
The control unit of system, the voltage-displacement converter section are electrically connected with the control unit.
4. slide valve gear according to claim 1, which is characterized in that
The elastomeric element is made of helical spring.
5. slide valve gear according to claim 4, which is characterized in that
There is recess portion in the axial one end of the spool, be accommodated with the axial other side of the helical spring within the recess
End.
6. slide valve gear according to claim 1, which is characterized in that
The slide valve gear also has the prevention releasing part for being installed on the shell, which prevents the valve
Core, the elastomeric element and the piezoelectric element fall off from the spool bore,
The piezoelectric element is fixed and being clamped by the elastomeric element and the prevention releasing part relative to the shell.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-038561 | 2018-03-05 | ||
| JP2018038561A JP2019152286A (en) | 2018-03-05 | 2018-03-05 | Spool valve device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209671676U true CN209671676U (en) | 2019-11-22 |
Family
ID=67948653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920280537.6U Expired - Fee Related CN209671676U (en) | 2018-03-05 | 2019-03-05 | Slide valve gear |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2019152286A (en) |
| CN (1) | CN209671676U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255691A (en) * | 2020-01-15 | 2020-06-09 | 珠海格力电器股份有限公司 | Screw compressor system capable of accurately regulating and controlling load, control method and air conditioner |
| CN111895171A (en) * | 2020-07-27 | 2020-11-06 | 西安涡普动力系统股份有限公司 | Switching valve mechanism capable of automatically cutting off power for automobile |
| CN112610185A (en) * | 2020-12-16 | 2021-04-06 | 中国石油大学(华东) | Underground multi-stage flow control system, method and application |
| CN112983913A (en) * | 2021-02-04 | 2021-06-18 | 大连海事大学 | Flow self-detection type electromagnetic switch valve |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5923060A (en) * | 1982-07-28 | 1984-02-06 | Hino Motors Ltd | Valve opening pressure controller for fuel injection valve in diesel engine |
| JPS62242190A (en) * | 1986-04-10 | 1987-10-22 | Tech Res Assoc Openair Coal Min Mach | Hydraulic control valve |
| JP2007100841A (en) * | 2005-10-04 | 2007-04-19 | Denso Corp | Spool valve device |
| CN202992229U (en) * | 2012-12-13 | 2013-06-12 | 浙江师范大学 | Intelligent high-flow piezoelectric hydraulic valve |
| JP5584751B2 (en) * | 2012-12-18 | 2014-09-03 | 本田技研工業株式会社 | Spool valve |
-
2018
- 2018-03-05 JP JP2018038561A patent/JP2019152286A/en active Pending
-
2019
- 2019-03-05 CN CN201920280537.6U patent/CN209671676U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255691A (en) * | 2020-01-15 | 2020-06-09 | 珠海格力电器股份有限公司 | Screw compressor system capable of accurately regulating and controlling load, control method and air conditioner |
| CN111255691B (en) * | 2020-01-15 | 2021-07-02 | 珠海格力电器股份有限公司 | Screw compressor system capable of accurately regulating and controlling load, control method and air conditioner |
| CN111895171A (en) * | 2020-07-27 | 2020-11-06 | 西安涡普动力系统股份有限公司 | Switching valve mechanism capable of automatically cutting off power for automobile |
| CN111895171B (en) * | 2020-07-27 | 2022-08-09 | 西安涡普动力系统股份有限公司 | Switching valve mechanism capable of automatically cutting off power for automobile |
| CN112610185A (en) * | 2020-12-16 | 2021-04-06 | 中国石油大学(华东) | Underground multi-stage flow control system, method and application |
| CN112983913A (en) * | 2021-02-04 | 2021-06-18 | 大连海事大学 | Flow self-detection type electromagnetic switch valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019152286A (en) | 2019-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191122 |