CN201521440U

CN201521440U - Improved inward rotation type gear pump

Info

Publication number: CN201521440U
Application number: CN2009200491629U
Authority: CN
Inventors: 徐永军; 冯益鹏; 张中达
Original assignee: Jiangsu Hongliu Chemical Machinery Co Ltd
Current assignee: Jiangsu Hongliu Chemical Machinery Co Ltd
Priority date: 2009-10-16
Filing date: 2009-10-16
Publication date: 2010-07-07
Anticipated expiration: 2019-10-16

Abstract

An improved inward rotation type gear pump is used for the delivery of materials with high viscosity, and comprises a pump cover, a pump shell, a driven shaft and a driven gear, a driving shaft and a driving gear, a pump seat and shaft seal, wherein a web plate of the driving gear is provided with a plurality of material supplying holes which are communicated with a pump chamber and a material dead angle area in the pump chamber; the material dead angle area in the pump chamber is an area formed by enclosing the right side of the web plate of the driving gear, the inner surface of the pump shell and the end surface of the pump seat; the pump can lead the materials in the dead angle area to recover mobility, reduce residual quantity, and has more stable and safer operation; and compared with the pump before the improvement, the service life is prolonged by one to two times.

Description

A kind of improved interior rotatable gear pump

Technical field

The utility model relates to interior rotatable gear pump, is applied to paint, the conveying of industry high-viscosity material such as coating, adhesive, petrochemical industry, food, medicine.

Background technique

Rotatable gear pump in the existing in the market NCB type is used for many years in industries such as paint, coating, adhesive, petrochemical industry, food, medicine.Find that in actual use this pump is when transfer of highly viscous material (especially relatively responsive to temperature material), the back flowability of heating is fine, mobile very poor even almost do not have flowability during normal temperature, for example: resin, pitch, lubricating grease, adhesive, chocolate mass, syrup etc.).This illustrates that this material is easy to carry when high temperature, in case stop to carry after an operation cycle finishes, salvage stores in the pump solidifies, when next time, pump restarted, will be difficult to normal startup, even after starting, remaining material produces pump case internal surface, driving gear surface and scratches wearing and tearing in the pump, cause vibration, also can cause shaft sealing leakage, thereby shortened the working life of pump.Existing corrective measure to this pump is, in the pump case outside, the pump cover outer end increases heating jacket, before pump startup, heat earlier like this, the interior salvage stores of pump is melted earlier, can improve the startup effect of pump like this, reduce the wearing and tearing of pump, but still have deficiency: at pump driving gear web right side and pump case internal surface, the interior salvage stores in this zone of pump seat end face (hereinafter to be referred as the material dead angle area in the pump chamber) still can not get good heating, pump still is in when starting and solidifies or half curdled appearance, this regional component wear still exists, influence to the axle envelope still exists, and is difficult to the effect that reaches desirable the working life of pump.

Summary of the invention

The utility model is just in order to overcome above-mentioned deficiency, a kind of improved interior rotatable gear pump is provided, it has solved the problem of high-viscosity material remaining in the pump chamber dead angle in normal temperature or low-temperature condition current downflow difference, main innovation is to bore several material charging holes on the web of driving gear, after increasing the material charging hole, no matter pump case, pump cover have or not heating jacket, as long as the material that enters in the pump chamber heated in advance, have good flowability and get final product, the material in the dead angle is melted rapidly.By making the pump startup running more steady after this improvement, wearing and tearing obviously reduce, and significantly improve working life; Pump is when shutting down simultaneously, and material returns pump chamber by charging hole in the dead angle, reduces the residual volume of material in the dead angle area, and it is faster, safer that pump is started next time.

Specifically implement like this: a kind of improved interior rotatable gear pump, comprise pump cover, pump case, driven shaft and driven gear, driving shaft and driving gear, pump seat, axle envelope, it is characterized in that offering several material charging holes on the web of driving gear, the material charging hole is communicated with material dead angle area in pump chamber and the pump chamber, and the material dead angle area is meant the web right side of pump driving gear and the zone that pump case internal surface, pump seat end face surround in the described pump chamber.Several material charging holes of on the web of driving gear, offering, shape can be straight, oblique cylinder bore or circular cone body opening, the hole is processing and fabricating easily.Enter in the pump chamber in the material dead angle area by the material charging hole through the material of heating in the pump chamber; material in this zone is melted rapidly; material has good flowability like this; load can reduce greatly during pump startup; also eliminated simultaneously the sharp wear that the critical piece to pump causes; the running of pump is also comparatively steady, and this axle envelope to pump also plays a very good protection.

Consider that increasing the material that enters in the dead angle area behind several material charging holes can increase; pair possibility of axle envelope build-up of pressure is arranged; set up a modification teflin ring (this material has excellent high temperature resistant, decay resistance also to have good self-lubricating property) at the pump seat left end for this reason; stop flow direction of material axle envelope place; effective like this axle envelope of having protected; simultaneously driving gear is increased by a supporting, the driving gear running is more steady like this.

In the pump case outside, pump cover ear end face place also can increase insulation jacket, helps remainingly in the pump chamber to quicken fusing, can also after pump shuts down, continue to heat, by compressed nitrogen or adopt the method for pump back suction to reduce salvage stores in the pump as far as possible.

If on web, do not increase the material charging hole, remain in the high-viscosity material of dead angle area in the pump so owing to lack mobile, this partial material can cause rapid wearing and tearing to driving gear and pump case, pump seat, also can produce vibration, influence axle envelope sealing surface, the axle envelope is produced in advance leak, these all will shorten the working life of pump greatly.After such improvement, can make the material in the dead angle area recover mobile, even pump quits work, return in the pump chamber the hole of material from the gear web in the dead angle area, reduce residual volume, by such improvement, can improve one to two times the working life of pump before improving, and make the more steady safety of running.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is a sectional view.

Fig. 3 is the web schematic representation.

Embodiment

A kind of improved interior rotatable gear pump, comprise pump cover 1, pump case 2, driven shaft 4 and driven gear 3, driving shaft 7 and driving gear 5, pump seat 8, axle envelope 9, offer several material charging holes 11 on the web 10 of driving gear 5, material charging hole 11 can be for straight, oblique cylinder bore or circular cone body opening, material charging hole 11 is communicated with pump chamber 12 and the interior material dead angle area 13 of pump chamber, material dead angle area 13 is meant web 10 right sides and the pump case internal surface of pump driving gear in the described pump chamber, the zone that pump seat 8 end faces surround, pump seat 8 left ends are set up a modification teflin ring 6.

Under the equal conditions, before pump improves and improve the working life of back in different medium:

Fed sheet of a media	Average life before improving	Average life after improving
Fed sheet of a media	Average life before improving	Average life after improving	Resinae	The 18-24 month	The 36-48 month
Pitch	6-8	12-18	Resinae	The 18-24 month	The 36-48 month
Pitch	6-8	12-18	Adhesive	8-12	16-24
Lubricating grease	10-12	18-30	Adhesive	8-12	16-24
Lubricating grease	10-12	18-30	Syrup, chocolate mass	8-12	12-24

Claims

One kind improved in rotatable gear pump, comprise pump cover, pump case, driven shaft and driven gear, driving shaft and driving gear, pump seat, axle envelope, it is characterized in that offering several material charging holes on the web of driving gear, the material charging hole is communicated with material dead angle area in pump chamber and the pump chamber, and the material dead angle area is meant the web right side of pump driving gear and the zone that pump case internal surface, pump seat end face surround in the described pump chamber.
2. improved interior rotatable gear pump according to claim 1 is characterized in that the material charging hole is straight or oblique cylinder bore or circular cone body opening.
3. according to claim 1 improved in rotatable gear pump, it is characterized in that the pump seat left end sets up a modification teflin ring.
According to claim 1,2, one of 3 described improved in rotatable gear pump, its feature in the pump case outside, pump cover ear end face place is provided with insulation jacket.