CN2448970Y - Roots vacuum pump - Google Patents
Roots vacuum pump Download PDFInfo
- Publication number
- CN2448970Y CN2448970Y CN 00256245 CN00256245U CN2448970Y CN 2448970 Y CN2448970 Y CN 2448970Y CN 00256245 CN00256245 CN 00256245 CN 00256245 U CN00256245 U CN 00256245U CN 2448970 Y CN2448970 Y CN 2448970Y
- Authority
- CN
- China
- Prior art keywords
- pump
- pump chamber
- fuel tank
- oil tanks
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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Abstract
The utility model mainly relates to a roots vacuum pump comprising a pump chamber, oil tanks and a middle spacer plate. The utility model is characterized in that the sealed oil tanks are communicated with the pump chamber through check valves; the oil tanks are communicated with outside through bleed valves. The check valves are additionally arranged between the oil tanks and the pump chamber at one direction, so gas in the oil tanks can be sucked in the pump chamber, but gas in the pump chamber can not whisk into the oil tanks. Simultaneously, the bleed valves arranged on shells of the two oil tanks can be used for automatically charging air after the pump is stopped until pressure gets balanced, so as to stop possibility for pump oil to damage or affect the normal running of the pump from the structure aspect.
Description
The utility model belongs to vacuum pump, relates generally to Roots pump.
Existing Roots pump, screw vacuum pump (hereinafter to be referred as pump) all are provided with fuel tank (claiming prechamber again) at the pump chamber two ends, separate with intermediate clapboard between pump chamber and fuel tank, have passage that pump chamber is communicated with fuel tank above or below the dividing plate.When pump work, pump chamber is vacuum pumping state (pressure reduction) progressively, and fuel tank is vacuum pumping state progressively also, and the pressure of fuel tank is with the change in pressure of pump chamber; When the pressure in the fuel tank during by high step-down, the gas in the fuel tank is drawn out of, and when the pressure in the fuel tank during by low uprising, the gas in the pump chamber enters fuel tank and tank pressure is raise.These gases that enter in the fuel tank may be water vapour, various corrosive gas or liquid, and they are serious to pump oil infringement in the fuel tank, make the pump deterioration of oil be unfavorable for the normal operation of pump.
The purpose of this utility model is the above-mentioned defective at prior art, designs a kind of interior gas of pump chamber or liquid of preventing and scurries in the fuel tank, prevents the pump deterioration of oil, helps the Roots pump of the normal operation of pump.
The technical solution of the utility model is: develop a kind of Roots pump, comprise pump chamber, fuel tank and intermediate clapboard, it is characterized in that the fuel tank that seals communicates with pump chamber by one-way valve, fuel tank is by bleed valve and exterior.
Above-mentioned one-way valve can be arranged on the intermediate clapboard between pump chamber and the fuel tank.
Above-mentioned bleed valve can be communicated with two fuel tanks by pipeline.
Because the utility model has been set up one-way valve between pump chamber and fuel tank, the gas in the fuel tank can be drawn into pump chamber, and the gas in the pump chamber can not be scurried into fuel tank.Simultaneously on the shell of two fuel tanks bleed valve is set, bleed valve is to the automatic air inlet of fuel tank, until pressure balance after the termination of pumping.Stop pump oil from structure and damaged, influenced the normal possibility of moving of pump.
Below in conjunction with drawings and Examples the utility model is further elaborated:
Fig. 1 is an embodiment's of the utility model a structural representation;
Fig. 2 is the local enlarged diagram of the A portion of Fig. 1.
Among the figure, one-way valve 4 is set at intermediate clapboard 8 places of the preceding fuel tank 2 of pump chamber 1; Intermediate clapboard 8 ' at the rear fuel tank 2 ' of pump chamber 1 is located, and one-way valve 4 ' is set, and on the shell of preceding fuel tank 2 and rear fuel tank 2 ' bleed valve is set.When the pump chamber internal pressure reduced, one-way valve 4 and one-way valve 4 ' were opened, and the gas in preceding fuel tank 2 and the rear fuel tank 2 ' is drawn out of; When the pump chamber internal pressure raise, one-way valve 4 and one-way valve 4 ' were closed, and pump chamber 1 is obstructed with preceding fuel tank 2 and rear fuel tank 2 ', and the unlikely fuel tank of scurrying into of the gas of pump chamber has been realized predetermined goal of the invention.
Among the figure, the 5th, the motor of pump, the 6th, the main shaft of pump, the 7th, the pump housing.
The utility model is equally applicable to the screw vacuum pump of similar etc.
Claims (3)
1. a Roots pump comprises pump chamber, fuel tank and intermediate clapboard, it is characterized in that the fuel tank that seals communicates with pump chamber by one-way valve, and fuel tank is by bleed valve and exterior.
2. according to the described Roots pump of claim 1, it is characterized in that one-way valve is arranged on the intermediate clapboard between pump chamber and the fuel tank.
3. according to the described Roots pump of claim 1, it is characterized in that bleed valve is communicated with two fuel tanks by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00256245 CN2448970Y (en) | 2000-11-01 | 2000-11-01 | Roots vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00256245 CN2448970Y (en) | 2000-11-01 | 2000-11-01 | Roots vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2448970Y true CN2448970Y (en) | 2001-09-19 |
Family
ID=33612995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00256245 Expired - Fee Related CN2448970Y (en) | 2000-11-01 | 2000-11-01 | Roots vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2448970Y (en) |
-
2000
- 2000-11-01 CN CN 00256245 patent/CN2448970Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |