CN107956695A - Roots vacuum system breaks empty halt circuit automatically - Google Patents
Roots vacuum system breaks empty halt circuit automatically Download PDFInfo
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- CN107956695A CN107956695A CN201711487412.2A CN201711487412A CN107956695A CN 107956695 A CN107956695 A CN 107956695A CN 201711487412 A CN201711487412 A CN 201711487412A CN 107956695 A CN107956695 A CN 107956695A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Break empty halt circuit automatically the invention discloses a kind of Roots vacuum system; including water ring pump starting or stopping control circuit, Roots vaccum pump starting or stopping control circuit, solenoid valve control circuit, relay on-off is coordinated to be shut down after realizing automatic broken sky using electric contact vacuum meter high-low position contact.Solenoid valves start brokenly sky when pressing stop button, when vacuum is less than high position 0.05MPa, motor is out of service, when vacuum reaches 0MPa, solenoid valve powers off, it can prevent because motor and storage tank break and form equalization point between empty and air inlet and the problem of can not break sky completely caused by broken blank pipe caliber is too small, especially suitable for broken blank pipe diameter≤DN25 vacuum systems.Original manual air valve is replaced by solenoid valve control; only need to be by a stop button after production; with regard to vacuum system can be made to break empty shut down automatically; compared with the prior art needs to be manually operated twice; effectively avoid 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 present invention relates to a kind of technical field of vacuum equipment, and in particular to a kind of Roots vacuum system breaks empty shutdown electricity automatically
Road.
Background technology
Roots vaccum pump refers to the lobed rotor equipped with two opposite direction synchronous rotaries in pump, between rotor, rotor and pump
Have 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 as shown in Figure 1, including water ring pump starting or stopping control circuit, including start 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
When reaching the first electric contact vacuum meter upper limit, make the Roots vacuum pump startup；When vacuum reaches first electricity
During contact vacuum meter lower limit, stop the Roots vaccum pump；Warning circuit, including the 3rd 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, close 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 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.During shutdown, manual unlocking air valve, when
When vacuum is less than lower limit, such as -0.05MPa, the first electric contact vacuum meter lower limit contact YJ1-2 closures, the first relay KA1
Coil obtain it is electric, while two KA1-2 of the first relay KA1 normally closed auxiliary contacts open, 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.
Among 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.
The content of the invention
The object of the present invention is to provide a kind of Roots vacuum system to break empty halt circuit automatically, with overcome in the prior art by
In maloperation causes unit to be damaged the problem of.
To achieve the above object, the present invention adopts the following technical scheme that：A kind of Roots vacuum system breaks empty shutdown electricity automatically
Road, including water ring pump starting or stopping control circuit, for controlling water ring pump startup and stopping；Connect with the water ring pump starting or stopping control circuit
The Roots vaccum pump starting or stopping control circuit connect, including the first electric contact vacuum meter, when vacuum, to reach first electric contact true
During empty table upper limit, make the Roots vacuum pump startup；When vacuum reaches the first electric contact vacuum meter lower limit, make
The Roots vaccum pump stops；Further include：Second electric contact vacuum meter and solenoid valve YV1, are respectively arranged on vacuum line；Electricity
Magnet valve control circuit, including a stop button SB2, after the stop button SB2 is pressed, the solenoid valve, which is attracted, to be started brokenly
It is empty；When vacuum drops to the second electric contact vacuum meter upper limit, water ring pump starting or stopping control circuit stops water ring pump；
When vacuum drops to the second electric contact vacuum meter lower limit, disconnect the solenoid valve.
Further, the solenoid valve control circuit includes the stop button SB2, and its one end connects the phase line of three-phase electricity
One end of normally opened one KA3-1 of auxiliary contact of L1, the 3rd relay KA3, the other end connect the 3rd normally opened auxiliary contact of 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 other end of the 5th relay KA5 normally closed auxiliary contacts connect the one of the 3rd relay KA3 coils
End and one end of solenoid valve YV1, the other end of the 3rd 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 its one end connects the phase line of three-phase electricity
L1, one end of first contactor KM1 normally closed auxiliary contacts, one end of the 4th relay KA4 normally closed auxiliary contacts, 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
Zero curve N is connected to, the other end of the 4th relay KA4 normally closed auxiliary contacts passes sequentially through the 3rd normally opened auxiliary contact of 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 its 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,
One end of the two normally opened auxiliary contact of contactor KM2, the other end of the first electric contact vacuum meter upper limit YJ1-1 connect 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
Close two KA1-2 of auxiliary contact, second contactor KM2 coils and the second electrothermal relay FR2 normally-closed contacts and be connected to zero curve N.
Further, the warning circuit being connected between phase line L1 and zero curve N is further included, when water ring pump or Roots vaccum pump
During motor overload, or when water level exceeds preset value, alarm signal is sent.
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, circuit for controlling motor is further included, connects the water ring pump and Roots vaccum pump, the motor control electricity
Road includes：
First electrothermal relay FR1 thermal elements, one end are connected with water ring pump, the other end pass sequentially through first contactor KM1 main contacts,
First circuit breaker Q F1, main circuit breaker QF are connected to three-phase electricity；
Second electrothermal relay FR2 thermal elements, one end are connected with Roots vaccum pump, and the other end passes sequentially through second contactor KM2 master
Contact, the second circuit breaker Q F2, main circuit breaker QF are connected to three-phase electricity.
The beneficial effects of the invention are as follows：Original manual air valve is replaced by solenoid valve control, by stopping after production
Only button, only need to once be manually operated with regard to vacuum system can be made to break empty shutdown automatically, need to be manually operated twice with the prior art
Compare, effectively prevent due to maloperation and do not break sky directly by stop button, cause unit to be damaged, easy to operate, security
It can greatly improve.And when vacuum reach 0MPa when just power off solenoid valve, prevent because break blank pipe caliber it is too small caused by motor and
The problem of storage tank breaks the equalization point formed between empty and air inlet and can not break sky completely.
Brief description of the drawings
Fig. 1 is existing Roots vacuum system control circuit.
Fig. 2 breaks empty shutdown control circuit for Roots vacuum system of the embodiment of the present invention automatically.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It is illustrated in figure 2 Roots vaccum pump of the embodiment of the present invention and breaks empty halt circuit, including water ring pump start-up and shut-down control automatically
Circuit, for controlling water ring pump startup and stopping.Including start button SB1, the phase line L1 of its one end connection three-phase electricity, first connect
One end of tentaculum KM1 normally closed auxiliary contacts, one end of the 4th relay KA4 normally closed auxiliary contacts, the first contact of other end connection
One end of the other end of device KM1 normally closed auxiliary contacts, the 6th relay KA6 normally closed auxiliary contacts, the 6th relay KA6 are normally closed auxiliary
Help that the other end of 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 normally opened two KA3-2 of auxiliary contact of the 3rd relay KA3 and
6th relay KA6 coils are connected to zero curve N.
The Roots vaccum pump starting or stopping control circuit being connected with the water ring pump starting or stopping control circuit, including start knob SA1,
Its 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, one end of the normally opened auxiliary contact of second contactor KM2 of two KA2-2 of point, 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
One end of one KA1-1, the other end of one KA1-1 of the first relay KA1 normally closed auxiliary contacts are 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 connected 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 connected with Roots vaccum pump, the other end
Pass sequentially through second contactor KM2 main contacts, the second circuit breaker Q F2, main circuit breaker QF and be connected to three-phase electricity.
The present invention newly one second electric contact vacuum meter of installation and solenoid valve YV1, and a solenoid valve control on vacuum line
Circuit processed, including stop button SB2, its one end connect phase line L1, the normally opened auxiliary contact one of the 3rd relay KA3 of three-phase electricity
One end of KA3-1, the other end connect the other end, the 5th relay KA5 of normally opened one KA3-1 of auxiliary contact of the 3rd relay KA3
One end of normally closed auxiliary contact, one end of the second electric contact vacuum meter upper limit JY2-1 and lower limit YJ2-2, the 5th relay
The other end of KA5 normally closed auxiliary contacts connects one end of the 3rd relay KA3 coils and one end of solenoid valve YV1, the 3rd relay
The other end of device 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's
The other end is connected to zero curve N by the 4th relay KA4 coils, and the other end of lower limit JY2-2 passes sequentially through the 5th relay
KA5 coils are connected to zero curve N.
Specific work process is：When starting operation, it is similarly to close and starts knob SA1, presses start button SB1, first
Contactor KM1 coils obtain electric, and water ring pump electric motor starting, starts to vacuumize；When vacuum 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.During stopping, equipment was being run
Vacuum reaches more than -0.09MPa in journey, and electric contact vacuum meter upper limit JY2-1 contacts are in closure state, stops when pressing
Button SB2, KA3 and KA4 coil at the same time it is electric, solenoid valve be attracted starts brokenly sky, when vacuum drops to the first electric contact vacuum
Table lower limit and the second electric contact vacuum meter upper limit, such as -0.05MPa, JY2-1 contacts disconnect, KA4 coil losing electricities, while KA4
Normally-closed contact closes, and KA6 coils obtain electric normally-closed contact and disconnect, and the power-off of KM1 coil losing electricities water ring pump is out of service.At the same time,
YJ1-2 normally opened contacts close, and KA1 coils obtain electric, two KA1-2 of KA1 normally-closed contacts disconnections, KM2 coil losing electricities, Roots vaccum pump
Power-off stops.When vacuum 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.
Warning circuit is additionally provided 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.In addition manual bypass can be increased newly, in case being used during 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.
Control circuit of the present invention coordinates relay on-off using electric contact vacuum meter high-low position contact, automatic broken to realize
The purpose shut down after sky.When vacuum system normal operation, more than -0.09MPa, electric contact vacuum meter is high-order to be set vacuum
0MPa, electric contact vacuum meter high position contact closure are arranged to for -0.05MPa, low level；When pressing stop button, solenoid valve leads to
Establish beginning broken sky by cable, when vacuum is less than high position setting -0.05MPa, motor is out of service, when vacuum reaches 0MPa, electricity
Magnet valve powers off, so as to be shut down after achieving the purpose that broken sky automatically, can prevent motor and storage tank caused by broken blank pipe caliber is too small
The problem of forming equalization point between broken empty and air inlet and sky can not be broken completely, especially suitable for breaking blank pipe diameter≤DN25 vacuum system
System.Original manual air valve is replaced by solenoid valve control, as soon as only it need to can make vacuum by time stop button after production
System breaks empty shutdown automatically, compared with the prior art needs to be manually operated twice, effectively prevent due to maloperation and broken sky
Stop button directly is pressed, causes unit to be damaged, easy to operate, security performance greatly improves.
In short, the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not intended to limit the invention, it is all in the present invention
Spirit and principle within all any modification, equivalent and improvement made etc., should be included in protection scope of the present invention it
It is interior.
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 stop；The Roots vaccum pump starting or stopping control circuit being connected with the water ring pump starting or stopping control circuit, including the first electricity connect
Point vacuum meter, when vacuum reaches the first electric contact vacuum meter upper limit, makes the Roots vacuum pump startup；Work as vacuum
When degree reaches the first electric contact vacuum meter lower limit, stop the Roots vaccum pump, it is characterised in that to 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 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 drops to the second electric contact vacuum meter lower limit, disconnect the solenoid valve.
2. a kind of Roots vacuum system according to claim 1 breaks empty halt circuit automatically, it is characterised in that the electromagnetism
Valve controling circuit includes the stop button（SB2）, phase line L1, the 3rd relay of its one end connection three-phase electricity（KA3）It is normally opened
Auxiliary contact one（KA3-1）One end, the other end connect the 3rd 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 the 3rd relay（KA3）The one of coil
End and solenoid valve（YV1）One end, the 3rd 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, it is characterised in that the water ring
Pump starting or stopping control circuit includes start button（SB1）, the phase line L1 of its 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, other end connection 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 the 3rd 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 right wants 1-3 any one breaks empty halt circuit automatically, it is characterised in that
The Roots vaccum pump starting or stopping control circuit includes starting knob（SA1）, its one end connection water ring pump starting or stopping control circuit,
The other end connects 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 connect
Tentaculum（KM2）One end of normally opened auxiliary contact, the first electric contact vacuum meter upper limit（YJ1-1）The other end connect the second relay
Device（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 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 after
Electric appliance（KA2）Normally opened auxiliary contact two（KA2-2）The other end and second contactor（KM2）The other end of normally opened auxiliary contact according to
It is secondary to pass through the first relay（KA1）Normally closed auxiliary contact two（KA1-2）, second contactor（KM2）Coil and the second electrothermal 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, it is characterised in that the company of further including
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
During value, alarm signal is sent.
6. a kind of Roots vacuum system according to claim 1 breaks empty halt circuit automatically, it is characterised 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, it is characterised in that further includes 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 elements, one end are connected with water ring pump, and the other end passes sequentially through first contactor（KM1）It is main to touch
Point, the first breaker（QF1）, main circuit breaker（QF）It is connected to three-phase electricity；
Second electrothermal relay（FR2）Thermal element, one end are connected 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711487412.2A CN107956695B (en) | 2017-12-30 | 2017-12-30 | Automatic empty breaking and stopping circuit of Roots vacuum unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711487412.2A CN107956695B (en) | 2017-12-30 | 2017-12-30 | Automatic empty breaking and stopping circuit of Roots vacuum unit |
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| CN107956695A true CN107956695A (en) | 2018-04-24 |
| CN107956695B CN107956695B (en) | 2024-08-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340434A (en) * | 2018-09-08 | 2019-02-15 | 深圳市能源环保有限公司 | A kind of two control valve device of power plant wet type mucking machine water compensating valve |
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