CN108075688A - Roots vacuum system breaks empty shutdown control circuit automatically - Google Patents
Roots vacuum system breaks empty shutdown control circuit automatically Download PDFInfo
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- CN108075688A CN108075688A CN201711491522.6A CN201711491522A CN108075688A CN 108075688 A CN108075688 A CN 108075688A CN 201711491522 A CN201711491522 A CN 201711491522A CN 108075688 A CN108075688 A CN 108075688A
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- control circuit
- relay
- vacuum
- roots
- water ring
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 230000005611 electricity Effects 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 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
- 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
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/54—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting two or more dynamo-electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Empty shutdown control circuit is broken automatically the invention discloses a kind of Roots vacuum system, including water ring pump starting or stopping control circuit, for controlling water ring pump startup and stopping；The Roots vaccum pump starting or stopping control circuit being connected with water ring pump starting or stopping control circuit, including the first electric contact vacuum meter, the Roots vacuum pump startup when vacuum degree reaches the first electric contact vacuum meter upper limit；Roots vaccum pump stops when vacuum degree reaches the first electric contact vacuum meter lower limit, further includes the second electric contact vacuum meter and solenoid valve, is respectively arranged on vacuum line；Solenoid valve control circuit includes a stop button, and solenoid valve actuation starts brokenly sky after stop button is pressed, and solenoid valve disconnects, water ring pump stops when vacuum degree reaches the second electric contact vacuum meter lower limit.The present invention only need to once be manually operated can just make vacuum system break automatically it is empty shut down, 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 shut down automatically to be controlled
Circuit processed.
Background technology
Roots vaccum pump refers to pump the built-in lobed rotor there are two opposite direction synchronous rotary, 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 as shown in Figure 1 existing Roots vacuum system control circuit, including water ring pump starting or stopping control circuit, is revolved including starting
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 starting 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
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 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.During shutdown, manual unlocking air valve, when
When vacuum degree is less than lower limit, such as -0.05MPa, the first electric contact vacuum meter lower limit contact YJ1-2 are closed, 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
Empty shutdown control circuit is broken automatically the object of the present invention is to provide a kind of Roots vacuum system, to overcome the prior art
In the problem of due to maloperation unit being caused to be damaged.
To achieve the above object, the present invention adopts the following technical scheme that：A kind of Roots vacuum system breaks empty shut down automatically to be controlled
Circuit processed, 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, connects when vacuum degree reaches first electricity
During point vacuum meter upper limit, make the Roots vacuum pump startup；When vacuum degree reaches the first electric contact vacuum meter lower limit
When, stop the Roots vaccum pump, further include：Second electric contact vacuum meter and solenoid valve, are respectively arranged on vacuum line；
Solenoid valve control circuit, including a stop button, after the stop button is pressed, for starting brokenly the solenoid valve actuation
Sky, and when vacuum degree reaches the second electric contact vacuum meter lower limit, disconnect the solenoid valve, while water ring pump start and stop
Control circuit stops water ring pump.
Further, the solenoid valve control circuit include stop button SB2, its one end connection three-phase electricity phase line L1,
One end of the 3rd normally opened auxiliary contact of relay KA3, the other end of the other end the 3rd normally opened auxiliary contact of relay KA3 of connection,
One end of 4th relay KA4 normally closed auxiliary contacts, one KA4-1, one end of the second electric contact vacuum meter lower limit, the 4th relay
The other end of one KA4-1 of device KA4 normally closed auxiliary contacts connects one end of the 3rd relay KA3 coils and one end of solenoid valve, the
The other end of three relay KA3 coils and the other end of solenoid valve are connected to zero curve N, the second electric contact vacuum meter lower limit it is another
One end is connected to zero curve N by the 4th relay KA4 coils.
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
One end of L1, first contactor KM1 normally closed auxiliary contacts, the other end of other end connection first contactor normally closed auxiliary contact,
One end of 4th relay KA4 normally closed auxiliary contacts, two KA4-2, two KA4-2's of the 4th relay KA4 normally closed auxiliary contacts is another
End passes sequentially through the coil of first contactor KM1 and the first electrothermal relay FR1 normally-closed contacts are connected to zero curve.
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
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, 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, and the other end passes sequentially through first contactor KM1 master and touches
Point, the first circuit breaker Q F1, main circuit breaker QF are connected to three-phase electricity；Second electrothermal relay FR2 thermal elements, one end and Roots vacuum
Pump connection, the other end pass sequentially through second contactor KM2 main contacts, the second circuit breaker Q F2, main circuit breaker QF and are connected to three-phase
Electricity.
Further, the first electric contact vacuum meter lower limit is identical with the second electric contact vacuum meter lower limit.
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
It compares, effectively prevents not breaking sky directly by stop button due to maloperation, unit is caused to be damaged, easy to operate, security
It can greatly improve.
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.
Specific 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 shutdown control circuit automatically, including water ring pump start and stop
Control circuit, for controlling water ring pump startup and stopping.Start button SB1 is specifically included, its one end connects the phase line of three-phase electricity
One end of L1, first contactor KM1 normally closed auxiliary contacts, the other end of other end connection first contactor normally closed auxiliary contact,
One end of 4th relay KA4 normally closed auxiliary contacts, two KA4-2, two KA4-2's of the 4th relay KA4 normally closed auxiliary contacts is another
End passes sequentially through the coil of first contactor KM1 and the first electrothermal relay FR1 normally-closed contacts are connected to zero curve.
The Roots vaccum pump starting or stopping control circuit being connected with the water ring pump starting or stopping control circuit, including starting 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
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 present invention newly installs one second electric contact vacuum meter and solenoid valve and solenoid valve control electricity on vacuum line
Road, including stop button SB2, its one end connects the phase line L1 of three-phase electricity, one end of the 3rd normally opened auxiliary contact of relay KA3,
The other end connects the other end, one KA4-1 of the 4th relay KA4 normally closed auxiliary contacts of the 3rd normally opened auxiliary contact of relay KA3
One end, one end of the second electric contact vacuum meter JY2 lower limits, one KA4-1's of the 4th relay KA4 normally closed auxiliary contacts is another
One end of the 3rd relay KA3 coils of end connection and one end of solenoid valve, the other end and solenoid valve of the 3rd relay KA3 coils
The other end be connected to zero curve N, the other end of the second electric contact vacuum meter JY2 lower limits is connected by the 4th relay KA4 coils
It is 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.During stopping, stop button is pressed
SB2, KA3 coil obtain electric, and solenoid valve actuation starts brokenly sky, when vacuum degree reaches the first electric contact vacuum meter and the second electric contact is true
Empty table lower limit, such as -0.05MPa, JY2 normally opened contacts be closed, KA4 coils obtain it is electric, while two KA4-2 of KA4 normally-closed contacts disconnect,
Motor and solenoid valve power-off are out of service.At the same time, YJ1-2 normally opened contacts are also closed, and KA1 coils obtain electric, KA1 normally-closed contacts
KA1-2 is disconnected, and KM2 coil losing electricities, Roots vaccum pump also powers off stopping.
Be 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.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 is suitable for broken blank pipe diameter >=DN50 vacuum systems, and original hand is replaced by solenoid valve control
Dynamic air valve, as soon as only vacuum system need to can be made to break empty shutdown automatically, with the prior art by time stop button after production
It needs to be manually operated twice and compare, effectively prevent not breaking sky directly by stop button due to maloperation, unit is caused 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 (8)
1. a kind of Roots vacuum system breaks empty shutdown control circuit automatically, including water ring pump starting or stopping control circuit, for controlling water
Ring pump startup and stopping；The Roots vaccum pump starting or stopping control circuit being connected with the water ring pump starting or stopping control circuit, including first
Electric contact vacuum meter when vacuum degree reaches the first electric contact vacuum meter upper limit, makes the Roots vacuum pump startup；When
When vacuum degree reaches the first electric contact vacuum meter lower limit, stop the Roots vaccum pump, which is characterized in that also to wrap
It includes：
Second electric contact vacuum meter and solenoid valve, are respectively arranged on vacuum line；
Solenoid valve control circuit, including a stop button, after the stop button is pressed, the solenoid valve actuation starts brokenly
Sky, and when vacuum degree reaches the second electric contact vacuum meter lower limit, disconnect the solenoid valve, while water ring pump start and stop
Control circuit stops water ring pump.
2. a kind of Roots vacuum system according to claim 1 breaks empty shutdown control circuit automatically, which is characterized in that described
Solenoid valve control circuit includes stop button（SB2）, phase line L1, the 3rd relay of its one end connection three-phase electricity（KA3）It is normally opened
One end of auxiliary contact, the other end connect the 3rd relay（KA3）The other end of normally opened auxiliary contact, the 4th relay（KA4）
Normally closed auxiliary contact one（KA4-1）One end, one end of the second electric contact vacuum meter lower limit, the 4th relay（KA4）It is normally closed
Auxiliary contact one（KA4-1）The other end connect the 3rd relay（KA3）One end of coil and solenoid valve（YV1）One end,
Three relays（KA3）The other end and solenoid valve of coil（YV1）The other end connection zero curve N, the second electric contact vacuum meter lower limit
The other end of position passes through the 4th relay（KA4）Coil connection zero curve N.
3. a kind of Roots vacuum system according to claim 1 breaks empty shutdown control circuit automatically, which is characterized in that described
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）
One end of normally closed auxiliary contact, the other end connect the other end, the 4th relay of first contactor normally closed auxiliary contact（KA4）Often
Close auxiliary contact two（KA4-2）One end, the 4th relay（KA4）Normally closed auxiliary contact two（KA4-2）The other end lead to successively
Cross first contactor（KM1）Coil and the first electrothermal relay（FR1）Normally-closed contact is connected to zero curve.
4. a kind of Roots vacuum system according to right wants 1-3 breaks empty shutdown control circuit automatically, which is characterized in that described
Roots vaccum pump starting or stopping control circuit includes starting knob（SA1）, its one end connects the water ring pump starting or stopping control circuit, another
The first electric contact vacuum meter upper limit of end connection（YJ1-1）And lower limit（YJ1-2）One end, the second relay（KA2）It is 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）The other end connect the second relay
（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 shutdown control circuit automatically, which is characterized in that also wraps
The warning circuit being connected between phase line L1 and zero curve N is included, when water ring pump or Roots vaccum pump motor overload or water level exceeds
During preset value, alarm signal is sent.
6. a kind of Roots vacuum system according to claim 1 breaks empty shutdown control circuit automatically, which is characterized in that described
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）Even
It is connected to phase line L1 and zero curve N.
7. a kind of Roots vacuum system according to claim 3 or 4 breaks empty shutdown control circuit automatically, which is characterized in that
Circuit for controlling motor is further included, connects the water ring pump and Roots vaccum pump, 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.
8. a kind of Roots vacuum system according to claim 1-5 any one breaks empty shutdown control circuit automatically, special
Sign is that the first electric contact vacuum meter lower limit is identical with the second electric contact vacuum meter lower limit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711491522.6A CN108075688A (en) | 2017-12-30 | 2017-12-30 | Roots vacuum system breaks empty shutdown control circuit automatically |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711491522.6A CN108075688A (en) | 2017-12-30 | 2017-12-30 | Roots vacuum system breaks empty shutdown control circuit automatically |
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| Publication Number | Publication Date |
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| CN108075688A true CN108075688A (en) | 2018-05-25 |
Family
ID=62156270
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711491522.6A Pending CN108075688A (en) | 2017-12-30 | 2017-12-30 | Roots vacuum system breaks empty shutdown control circuit automatically |
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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 |
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