CN207686976U - Roots vacuum system breaks empty halt circuit automatically - Google Patents
Roots vacuum system breaks empty halt circuit automatically Download PDFInfo
- Publication number
- CN207686976U CN207686976U CN201721908016.8U CN201721908016U CN207686976U CN 207686976 U CN207686976 U CN 207686976U CN 201721908016 U CN201721908016 U CN 201721908016U CN 207686976 U CN207686976 U CN 207686976U
- Authority
- CN
- China
- Prior art keywords
- relay
- vacuum
- contact
- control circuit
- auxiliary contact
- 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.)
- Active
Links
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The utility model discloses a kind of Roots vacuum systems to break empty halt circuit automatically; including water ring pump starting or stopping control circuit, Roots vaccum pump starting or stopping control circuit, solenoid valve control circuit, shut down after realizing automatic broken sky using electric contact vacuum meter high-low position contact cooperation relay on-off.Solenoid valves start brokenly sky when pressing stop button, when vacuum degree is less than high position 0.05MPa, motor is out of service, when vacuum degree reaches 0MPa, solenoid valve powers off, it can prevent because breaking the too small problem for causing that sky can not be broken due to forming equalization point between motor and the broken empty and air inlet of storage tank completely of blank pipe caliber, especially suitable for breaking blank pipe diameter≤DN25 vacuum systems.Original manual air valve is replaced by solenoid valve control; it only need to be by a stop button after production; vacuum system can be made to break empty shut down automatically; compared with the prior art needs to be manually operated twice; it effectively avoids due to maloperation and broken sky directly causes unit to be damaged by stop button; easy to operate, security performance greatly improves.
Description
Technical field
The utility model is related to a kind of technical field of vacuum equipment, and in particular to a kind of Roots vacuum system breaks sky and stops automatically
Electromechanical road.
Background technology
Roots vaccum pump refers to the built-in lobed rotor there are two opposite direction synchronous rotary of pump, between rotor, rotor and pump
There is slight gap between shell inner wall and a kind of non-touching positive displacement vacuum pump.Roots vaccum pump is widely used in oil, chemical industry, smelting
The industry such as gold, weaving, pharmacy.
It is existing Roots vacuum system control circuit, including water ring pump starting or stopping control circuit as shown in Figure 1, including starts rotation
Button SB1, stop button SB2, first contactor KM1 and the first electrothermal relay FR1, for controlling water ring pump startup and stopping；With
The Roots vaccum pump starting or stopping control circuit of the water ring pump starting or stopping control circuit connection, including start knob SA1, the first electric contact
Vacuum meter YJ1, the first relay KA1, the second relay KA2, second contactor KM2 and the second electrothermal relay FR2, work as vacuum degree
When reaching the first electric contact vacuum meter upper limit, make the Roots vacuum pump startup；When vacuum degree reaches first electricity
When contact vacuum meter lower limit, the Roots vaccum pump is made to stop；Warning circuit, including third relay KA3, button SA2, report
Alert electric bell HA, the first electrothermal relay FR1, the second electrothermal relay FR2 and water-pressure relay DSK；And circuit for controlling motor, connection
Water ring pump and Roots vaccum pump, including main circuit breaker QF, the first circuit breaker Q F1, the second circuit breaker Q F2, first contactor KM1 master
Contact, second contactor KM2 main contacts, the first electrothermal relay FR1, the second electrothermal relay FR2.
Specific work process is：When starting operation, closes and start knob SA1, press start button SB1, first contactor
KM1 coils obtain electric, and water ring pump electric motor starting starts to vacuumize；When vacuum degree reaches upper limit, such as -0.08MPa, the first electricity
Contact vacuum meter upper limit contact YJ1-1 is closed, and the second relay KA2 coils obtain electric, while the normally opened auxiliary of sieve the second relay KA2
Two KA2-2 of contact is closed, and second contactor KM2 coils obtain electric, Roots vacuum pump startup.When shutdown, air valve is opened manually, when
When vacuum degree is less than lower limit, such as -0.05MPa, the first electric contact vacuum meter lower limit contact YJ1-2 is closed, the first relay KA1
Coil obtains electric, while the first relay KA1 normally closed auxiliary contacts two KA1-2 is opened, second contactor KM2 coil losing electricities, Roots
Vacuum pump is out of service, then presses stop button SB2, and water ring pump motor is out of service.
In production process, stop button SB2 is directly pressed since maloperation is broken empty, cause motor operation direction with
The reaction force in pipe network negative pressure direction, vacuum pump body impeller is damaged, which reprocesses long in time limit, influences normally to produce.
Utility model content
The purpose of this utility model is to provide a kind of Roots vacuum system and breaks empty halt circuit automatically, to overcome the prior art
In the problem of causing unit to be damaged due to maloperation.
To achieve the above object, the utility model adopts the following technical solution：A kind of Roots vacuum system breaks sky and stops automatically
Electromechanical road, including water ring pump starting or stopping control circuit, for controlling water ring pump startup and stopping；With water ring pump start-up and shut-down control electricity
The Roots vaccum pump starting or stopping control circuit of road connection, including the first electric contact vacuum meter, connect when vacuum degree reaches first electricity
When point vacuum meter upper limit, make the Roots vacuum pump startup；When vacuum degree reaches the first electric contact vacuum meter lower limit
When, so that the Roots vaccum pump is stopped；Further include：Second electric contact vacuum meter and solenoid valve YV1, are respectively arranged in vacuum line
On；Solenoid valve control circuit, including a stop button SB2, after pressing the stop button SB2, the solenoid valve actuation is opened
Begin broken sky；When vacuum degree drops to the second electric contact vacuum meter upper limit, water ring pump starting or stopping control circuit makes water ring pump
Stop；When vacuum degree drops to the second electric contact vacuum meter lower limit, the solenoid valve is made to disconnect.
Further, the solenoid valve control circuit includes the stop button SB2, and one end connects the phase line of three-phase electricity
One end of normally opened one KA3-1 of auxiliary contact of L1, third relay KA3, the other end connect the normally opened auxiliary contact of third relay KA3
The other end of one KA3-1, one end of the 5th relay KA5 normally closed auxiliary contacts, the second electric contact vacuum meter upper limit JY2-1 and
One end of lower limit YJ2-2, the one of the other end connection third relay KA3 coils of the 5th relay KA5 normally closed auxiliary contacts
The one end at end and solenoid valve YV1, the other end of third relay KA3 coils and the other end of solenoid valve YV1 are connected to zero curve N,
The other end of second electric contact vacuum meter upper limit JY2-1 is connected to zero curve N, lower limit by the 4th relay KA4 coils
The other end of JY2-2 passes sequentially through the 5th relay KA5 coils and is connected to zero curve N.
Further, the water ring pump starting or stopping control circuit includes start button SB1, and one end connects the phase line of three-phase electricity
L1, one end of first contactor KM1 normally closed auxiliary contacts, the 4th relay KA4 normally closed auxiliary contacts one end, the other end connection
The other end, the 6th relay of first contactor KM1 normally closed auxiliary contacts（One end of KA6 normally closed auxiliary contacts, the 6th relay
The other end of KA6 normally closed auxiliary contacts passes sequentially through the coil of first contactor KM1 and the first electrothermal relay FR1 normally-closed contacts connect
It is connected to zero curve N, the other end of the 4th relay KA4 normally closed auxiliary contacts passes sequentially through the normally opened auxiliary contact of third relay KA3
Two KA3-2 and the 6th relay KA6 coils are connected to zero curve N.
Further, the Roots vaccum pump starting or stopping control circuit includes starting knob SA1, and one end connects the water ring
Starting or stopping control circuit is pumped, the other end connects one end of the first electric contact vacuum meter upper limit YJ1-1 and lower limit YJ1-2, second
One end of normally opened one KA2-1 of auxiliary contact of relay KA2, one end of normally opened two KA2-2 of auxiliary contact of the second relay KA2,
The other end of one end of the two normally opened auxiliary contact of contactor KM2, the first electric contact vacuum meter upper limit YJ1-1 connects the second relay
The other end of normally opened one KA2-1 of auxiliary contact of device KA2, one end of one KA1-1 of the first relay KA1 normally closed auxiliary contacts, first
The other end of one KA1-1 of relay KA1 normally closed auxiliary contacts is connected to zero curve N by the second relay KA2 coils；First electricity connects
The other end of point vacuum meter lower limit is connected to zero curve N, the second normally opened auxiliary of relay KA2 by the first relay KA1 coils
It is normal that the other end of two KA2-2 of contact and the other end of the normally opened auxiliary contact of second contactor KM2 pass sequentially through the first relay KA1
It closes two KA1-2 of auxiliary contact, second contactor KM2 coils and the second electrothermal relay FR2 normally-closed contacts and is connected to zero curve N.
Further, further include the warning circuit being connected between phase line L1 and zero curve N, when water ring pump or Roots vaccum pump
When motor overload or when water level exceeds preset value, alarm signal is sent out.
Further, the water ring pump starting or stopping control circuit, Roots vaccum pump starting or stopping control circuit and solenoid valve control electricity
Road is connected to phase line L1 and zero curve N by air switch 3QF.
Further, further include circuit for controlling motor, connect the water ring pump and Roots vaccum pump, the motor control electricity
Road includes：
First electrothermal relay FR1 thermal elements, one end are connect with water ring pump, and the other end passes sequentially through first contactor KM1 master
Contact, the first circuit breaker Q F1, main circuit breaker QF are connected to three-phase electricity；
Second electrothermal relay FR2 thermal elements, one end are connect with Roots vaccum pump, and the other end passes sequentially through second contactor
KM2 main contacts, the second circuit breaker Q F2, main circuit breaker QF are connected to three-phase electricity.
The utility model has the beneficial effects that：Original manual air valve is replaced by solenoid valve control, after production
Stop button is pressed, only need to once be manually operated can make vacuum system break empty shutdown automatically, be needed with the prior art manual twice
Operation is compared, and effectively prevents not breaking sky directly by stop button due to maloperation, unit is caused to be damaged, easy to operate, peace
Full performance greatly improves.And just solenoid valve is made to power off when vacuum degree reaches 0MPa, prevent the electricity caused by broken blank pipe caliber is too small
Machine and storage tank break the equalization point formed between empty and air inlet and can not break empty problem completely.
Description of the drawings
Fig. 1 is existing Roots vacuum system control circuit.
Fig. 2 is that the utility model embodiment Roots vacuum system breaks empty shutdown control circuit automatically.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
It is illustrated in figure 2 the utility model embodiment Roots vaccum pump and breaks empty halt circuit, including water ring pump start and stop automatically
Control circuit, for controlling water ring pump startup and stopping.Including start button SB1, one end connects the phase line L1 of three-phase electricity, the
One end of one contactor KM1 normally closed auxiliary contacts, one end of the 4th relay KA4 normally closed auxiliary contacts, other end connection first
One end of the other end of contactor KM1 normally closed auxiliary contacts, the 6th relay KA6 normally closed auxiliary contacts, the 6th relay KA6 are normal
The other end for closing auxiliary contact passes sequentially through the coil of first contactor KM1 and the first electrothermal relay FR1 normally-closed contacts are connected to
Zero curve N, the other ends of the 4th relay KA4 normally closed auxiliary contacts pass sequentially through the normally opened auxiliary contact of third relay KA3 two
KA3-2 and the 6th relay KA6 coils are connected to zero curve N.
The Roots vaccum pump starting or stopping control circuit being connect with the water ring pump starting or stopping control circuit, including start knob SA1,
One end connects the water ring pump starting or stopping control circuit, and the other end connects the first electric contact vacuum meter upper limit YJ1-1 and lower limit
Position one end of YJ1-2, one end of normally opened one KA2-1 of auxiliary contact of the second relay KA2, the normally opened auxiliary of the second relay KA2 are touched
One end of two KA2-2 of point, one end of the normally opened auxiliary contact of second contactor KM2, the first electric contact vacuum meter upper limit YJ1-1's
The other end connects the other end, the first relay KA1 normally closed auxiliary contacts of normally opened one KA2-1 of auxiliary contact of the second relay KA2
The other end of one end of one KA1-1, one KA1-1 of the first relay KA1 normally closed auxiliary contacts is connected by the second relay KA2 coils
It is connected to zero curve N；The other end of first electric contact vacuum meter lower limit is connected to zero curve N by the first relay KA1 coils, and second
The other end of normally opened two KA2-2 of auxiliary contact of relay KA2 and the other end of the normally opened auxiliary contact of second contactor KM2 lead to successively
Cross two KA1-2 of the first relay KA1 normally closed auxiliary contacts, second contactor KM2 coils and the second electrothermal relay FR2 normally-closed contacts
It is connected to zero curve N.
Circuit for controlling motor, connects the water ring pump and Roots vaccum pump, and the circuit for controlling motor includes：First heat after
Electric appliance FR1 thermal elements, one end are connect with water ring pump, and the other end passes sequentially through first contactor KM1 main contacts, the first breaker
QF1, main circuit breaker QF are connected to three-phase electricity；Second electrothermal relay FR2 thermal elements, one end are connect with Roots vaccum pump, the other end
It passes sequentially through second contactor KM2 main contacts, the second circuit breaker Q F2, main circuit breaker QF and is connected to three-phase electricity.
The utility model newly installs one second electric contact vacuum meter and solenoid valve YV1 and an electromagnetism on vacuum line
Valve controling circuit, including stop button SB2, one end connect phase line L1, the normally opened auxiliary contact of third relay KA3 of three-phase electricity
One end of one KA3-1, the other end connect the other end, the 5th relay of normally opened one KA3-1 of auxiliary contact of third relay KA3
One end of KA5 normally closed auxiliary contacts, the second electric contact vacuum meter upper limit JY2-1 and lower limit YJ2-2 one end, the 5th relay
Device KA5 normally closed auxiliary contacts the other end connection third relay KA3 coils one end and solenoid valve YV1 one end, third after
The other end of electric appliance KA3 coils and the other end of solenoid valve YV1 are connected to zero curve N, the second electric contact vacuum meter upper limit JY2-1
The other end zero curve N is connected to by the 4th relay KA4 coils, the other end of lower limit JY2-2 passes sequentially through the 5th relay
Device KA5 coils are connected to zero curve N.
Specific work process is：It when starting operation, is similarly to close and starts knob SA1, press start button SB1, first
Contactor KM1 coils obtain electric, and water ring pump electric motor starting starts to vacuumize；When vacuum degree reaches upper limit, such as -0.08MPa,
First electric contact vacuum meter upper limit contact YJ1-1 is closed, and the second relay KA2 coils obtain electric, while the second relay KA2 is normally opened
Two KA2-2 of auxiliary contact is closed, and second contactor KM2 coils obtain electric, Roots vacuum pump startup.When stopping, equipment was being run
Vacuum degree has reached -0.09MPa or more in journey, and the contacts electric contact vacuum meter upper limit JY2-1 are in closed state, stops when pressing
Button SB2, KA3 and KA4 coil simultaneously must be electric, and solenoid valve actuation starts brokenly sky, when vacuum degree drops to the first electric contact vacuum
Table lower limit and the second electric contact vacuum meter upper limit, such as -0.05MPa, the contacts JY2-1 disconnect, KA4 coil losing electricities, while KA4
Normally-closed contact is closed, and KA6 coils obtain electric normally-closed contact and disconnect, and the power-off of KM1 coil losing electricity water ring pumps is out of service.At the same time,
YJ1-2 normally opened contacts are closed, and KA1 coils obtain electric, KA1 normally-closed contacts two KA1-2 disconnections, KM2 coil losing electricities, Roots vaccum pump
Power-off stops.When vacuum degree continues to decline, and such as reaches 0MPa, the second electric contact vacuum meter lower limit JY2-2 contact closures,
KA5 coils obtain electric, and KA5 normally-closed contacts disconnect, and KA3 coil losing electricities, solenoid valve YV1 is stopped.
It is additionally provided with warning circuit between phase line L1 and zero curve N, when water ring pump or Roots vaccum pump motor overload, or
When water level exceeds preset value, alarm signal is sent out.In addition manual bypass can be increased newly, in case being used when solenoid valve failure.The water
Ring pump starting or stopping control circuit, Roots vaccum pump starting or stopping control circuit and solenoid valve control circuit are connected to by air switch 3QF
Phase line L1 and zero curve N, plays a protective role when circuit overloads.
The utility model control circuit coordinates relay on-off using electric contact vacuum meter high-low position contact, to realize certainly
The purpose shut down after dynamic broken sky.When vacuum system normal operation, for vacuum degree more than -0.09MPa, electric contact vacuum meter is high-order
It is set as -0.05MPa, low level is set as 0MPa, electric contact vacuum meter high position contact closure；When pressing stop button, electromagnetism
Valve energization starts brokenly sky, and when vacuum degree is less than high position setting -0.05MPa, motor is out of service, when vacuum degree reaches 0MPa
When, solenoid valve power-off, to achieve the purpose that it is automatically broken empty after shut down, can prevent because break blank pipe caliber it is too small caused by motor and
It forms equalization point between the broken empty and air inlet of storage tank and empty problem can not be broken completely, it is true especially suitable for broken blank pipe diameter≤DN25
Empty set is united.Original manual air valve is replaced by solenoid valve control, as soon as it need to can only make by time stop button after production
Vacuum system break automatically it is empty shut down, compared with the prior art needs to be manually operated twice, effectively prevent due to maloperation and not
Broken sky directly presses stop button, causes unit to be damaged, easy to operate, security performance greatly improves.
In short, the above is only the preferred embodiment of the utility model only, it is not intended to limit the utility model, it is all
All any modification, equivalent and improvement made within spirit of the present utility model and principle etc., should be included in this practicality
Within novel protection domain.
Claims (7)
1. a kind of Roots vacuum system breaks empty halt circuit, including water ring pump starting or stopping control circuit automatically, for controlling water ring pump
Start and stops；The Roots vaccum pump starting or stopping control circuit being connect with the water ring pump starting or stopping control circuit, including the first electricity connect
Point vacuum meter makes the Roots vacuum pump startup when vacuum degree reaches the first electric contact vacuum meter upper limit；Work as vacuum
When degree reaches the first electric contact vacuum meter lower limit, the Roots vaccum pump is set to stop, which is characterized in that further include：
Second electric contact vacuum meter and solenoid valve（YV1）, it is respectively arranged on vacuum line；
Solenoid valve control circuit, including a stop button（SB2）, when pressing the stop button（SB2）Afterwards, the solenoid valve is inhaled
Run beginning broken sky jointly；When vacuum degree drops to the second electric contact vacuum meter upper limit, water ring pump starting or stopping control circuit makes water
Ring pump stops；When vacuum degree drops to the second electric contact vacuum meter lower limit, the solenoid valve is made to disconnect.
2. a kind of Roots vacuum system according to claim 1 breaks empty halt circuit automatically, which is characterized in that the electromagnetism
Valve controling circuit includes the stop button（SB2）, phase line L1, the third relay of one end connection three-phase electricity（KA3）It is normally opened
Auxiliary contact one（KA3-1）One end, the other end connect third relay（KA3）Normally opened auxiliary contact one（KA3-1）It is another
End, the 5th relay（KA5）One end of normally closed auxiliary contact, the second electric contact vacuum meter upper limit（JY2-1）And lower limit
（YJ2-2）One end, the 5th relay（KA5）The other end of normally closed auxiliary contact connects third relay（KA3）The one of coil
End and solenoid valve（YV1）One end, third relay（KA3）The other end and solenoid valve of coil（YV1）The other end be connected to
Zero curve N, the second electric contact vacuum meter upper limit（JY2-1）The other end pass through the 4th relay（KA4）Coil is connected to zero curve
N, lower limit（JY2-2）The other end pass sequentially through the 5th relay（KA5）Coil is connected to zero curve N.
3. a kind of Roots vacuum system according to claim 1 breaks empty halt circuit automatically, which is characterized in that the water ring
It includes start button to pump starting or stopping control circuit（SB1）, the phase line L1 of one end connection three-phase electricity, first contactor（KM1）It is normally closed
One end of auxiliary contact, the 4th relay（KA4）One end of normally closed auxiliary contact, the other end connect first contactor（KM1）Often
Close the other end, the 6th relay of auxiliary contact（KA6）One end of normally closed auxiliary contact, the 6th relay（KA6）Normally closed auxiliary
The other end of contact passes sequentially through first contactor（KM1）Coil and the first electrothermal relay（FR1）Normally-closed contact is connected to zero
Line N, the 4th relay（KA4）The other end of normally closed auxiliary contact passes sequentially through third relay（KA3）Normally opened auxiliary contact two
（KA3-2）With the 6th relay（KA6）Coil is connected to zero curve N.
4. a kind of Roots vacuum system according to claim 1-3 any one breaks empty halt circuit automatically, feature exists
In the Roots vaccum pump starting or stopping control circuit includes starting knob（SA1）, it is electric that one end connects the water ring pump start-up and shut-down control
Road, the other end connect the first electric contact vacuum meter upper limit（YJ1-1）And lower limit（YJ1-2）One end, the second relay
（KA2）Normally opened auxiliary contact one（KA2-1）One end, the second relay（KA2）Normally opened auxiliary contact two（KA2-2）One end,
Second contactor（KM2）One end of normally opened auxiliary contact, the first electric contact vacuum meter upper limit（YJ1-1）Other end connection the
Two relays（KA2）Normally opened auxiliary contact one（KA2-1）The other end, the first relay（KA1）Normally closed auxiliary contact one（KA1-
1）One end, the first relay（KA1）Normally closed auxiliary contact one（KA1-1）The other end pass through the second relay（KA2）Coil
It is connected to zero curve N；The other end of first electric contact vacuum meter lower limit passes through the first relay（KA1）Coil is connected to zero curve N,
Second relay（KA2）Normally opened auxiliary contact two（KA2-2）The other end and second contactor（KM2）Normally opened auxiliary contact it is another
One end passes sequentially through the first relay（KA1）Normally closed auxiliary contact two（KA1-2）, second contactor（KM2）Coil and the second heat
Relay（FR2）Normally-closed contact is connected to zero curve N.
5. a kind of Roots vacuum system according to claim 1 breaks empty halt circuit automatically, which is characterized in that further include connecting
The warning circuit being connected between phase line L1 and zero curve N, when water ring pump or Roots vaccum pump motor overload or water level is beyond default
When value, alarm signal is sent out.
6. a kind of Roots vacuum system according to claim 1 breaks empty halt circuit automatically, which is characterized in that the water ring
Pump starting or stopping control circuit, Roots vaccum pump starting or stopping control circuit and solenoid valve control circuit pass through air switch（3QF）It is connected to
Phase line L1 and zero curve N.
7. a kind of Roots vacuum system according to claim 4 breaks empty halt circuit automatically, which is characterized in that further include electricity
Machine control circuit, connects the water ring pump and Roots vaccum pump, and the circuit for controlling motor includes：
First electrothermal relay（FR1）Thermal element, one end are connect with water ring pump, and the other end passes sequentially through first contactor（KM1）It is main
Contact, the first breaker（QF1）, main circuit breaker（QF）It is connected to three-phase electricity；
Second electrothermal relay（FR2）Thermal element, one end are connect with Roots vaccum pump, and the other end passes sequentially through second contactor
（KM2）Main contacts, the second breaker（QF2）, main circuit breaker（QF）It is connected to three-phase electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721908016.8U CN207686976U (en) | 2017-12-30 | 2017-12-30 | Roots vacuum system breaks empty halt circuit automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721908016.8U CN207686976U (en) | 2017-12-30 | 2017-12-30 | Roots vacuum system breaks empty halt circuit automatically |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207686976U true CN207686976U (en) | 2018-08-03 |
Family
ID=62993858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721908016.8U Active CN207686976U (en) | 2017-12-30 | 2017-12-30 | Roots vacuum system breaks empty halt circuit automatically |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207686976U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107956695A (en) * | 2017-12-30 | 2018-04-24 | 浙江尖峰药业有限公司 | Roots vacuum system breaks empty halt circuit automatically |
-
2017
- 2017-12-30 CN CN201721908016.8U patent/CN207686976U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107956695A (en) * | 2017-12-30 | 2018-04-24 | 浙江尖峰药业有限公司 | Roots vacuum system breaks empty halt circuit automatically |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207686976U (en) | Roots vacuum system breaks empty halt circuit automatically | |
| CN207753640U (en) | Roots vacuum system breaks empty shutdown control circuit automatically | |
| CN107956695A (en) | Roots vacuum system breaks empty halt circuit automatically | |
| CN108075688A (en) | Roots vacuum system breaks empty shutdown control circuit automatically | |
| CN202370808U (en) | Vacuum automation control system | |
| CN104196736B (en) | High efficiency smart self-priming pump control wiring structure | |
| CN207686977U (en) | Water ring vacuum pump breaks empty shutdown control circuit automatically | |
| CN203879722U (en) | Automatic control device of air compressors | |
| CN104917423B (en) | A kind of reduced-voltage starting control system | |
| CN103683891A (en) | Frequency converter control circuit and method and speed control system | |
| CN108194361A (en) | Water ring vacuum pump breaks empty shutdown control circuit automatically | |
| CN207543015U (en) | Two desalination water pumps share frequency conversion switching control device | |
| CN103982765A (en) | Oil pump switching device for oil station of mill | |
| CN204140455U (en) | A kind of high efficiency smart self-priming pump control wiring structure | |
| CN207278556U (en) | A kind of pressurized tank pump control unit based on motor speed | |
| CN202724863U (en) | Two-stage vacuum oil purifier | |
| CN206268048U (en) | Air compressor machine frequency conversion system with standby frequency converter | |
| CN203730272U (en) | Intelligent vacuum pump | |
| CN103696952B (en) | A kind of intelligent vacuum pump | |
| CN206801902U (en) | A kind of transformer station's centrifugation apparatus for controlling pump of the anhydrous idle running protection of band | |
| CN202099830U (en) | Automatic water supply system for construction water | |
| CN206694235U (en) | A kind of Lubricating-oil Station motor, oil pump protection circuit | |
| CN204834411U (en) | Combined transformer | |
| CN106547281B (en) | Condenser hotwell tank level control system | |
| CN102710215B (en) | Control circuit of oil pump motor for mobile garbage compression transfer station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |