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Armenia Intellectual Property Agency
Utility Model Number: 302 U
Date of Patent: October 3, 2012
Gear Pump with Different Teeth
Inventor: Varuzhan Harutyunyan, Nor-Nork 9th massive 97/7, 0059 Yerevan, Armenia
Application No.: AM20120085U
Filed: June 18, 2012
Field of the invention
Field of the invention
The invention concerns positive displacement rotary pumps and compressors.
Description of related art
Description of related art
An external gear pump in the field concerned is described in the book: A. G. Skhirtladze, V. I. Ivanov, V. N. Kareev “Gidravlicheskie i pnevmaticheskie sistemi” pages 94-101, published at 2006.
Abstract
Abstract
The utility model represents as positive displacement rotary pump.
Gear Pump with Different Teeth consists of a case, a pair of meshing cylindrical gears in it, two ports in the case: one for the liquid suction and the other one for the liquid discharge. The first gear rotates from actuator. The teeth of the gears have the same pitch diameter.
The first gear has two opposite big teeth, while the second gear has two opposite big cavities having the pitch greater than pitch of small teeth in 3, 5, 7 or more times. The addendum diameter of big teeth is greater than the addendum diameter of small teeth, whereas the dedendum diameter of big cavities is taken so, that a big tooth of the first gear can easily mesh with a big cavity of the second gear.
The reliability and effectiveness are enhanced.
Brief Description of the Drawings
Brief Description of the Drawings
Fig. 1 is an axonometric view of the gear pump with different teeth without cover
Fig. 2 is a plan view of the pump without cover
Description
Description
Engineering level
Engineering level
The external gear pump consists of meshing cylindrical gears and the case, which has two ports: one for liquid intake and the other one for its discharge. One of the gears receives rolling motion from actuator, while the other one rotates through meshing with the previous gear. The liquid is filled into the cavities between teeth and is delivered to discharge port along the case contour. The liquid cannot flow in the opposite direction because of the teeth strong meshing.
The pump has following limitations:
Since the suction occurs when a tooth of one gear leaves a cavity of the other gear, the pump generates low vacuum, which prevents its use for delivering high viscous liquids and limits suction head as well. Based on the suction and discharge nature, the pump has low admission and compression ratio, which results high volumetric losses after slight wear of teeth especially at high pressure. Because of the low compression ratio, the device cannot be used as compressor.
Disclosure of the utility model
Disclosure of the utility model
The purpose of the invention is to improve the gear pump design so, that it will have relatively high admission and compression ratio to enhance its volumetric efficiency and to enable its usage as compressor. The pump has gears 1 and 2, which are in pin connection with case 3 through shafts 4 and 5. The case has inlet 6 and outlet 7 ports. The gears have many small teeth 8. The first gear 1 has two opposite big teeth 9, whereas the second gear 2 has two opposite big cavities 10. The pitch of big teeth and big cavities is greater than the pitch of small teeth in 3, 5, 7 or more times. The contours of all teeth and big cavities have the same pitch diameter 11. The gears are mounted against each other in the case in such a way that a big tooth of the first gear meshes with a big cavity of the second gear. The pump operates in the following way: The actuator 12 rotates the first gear 1 through shaft 4. The second gear 2 is rotated from the first gear 1 through meshing. When the pump rotates in the mentioned direction of Fig. 2, the liquid is filled through inlet port 6 into continuously increasing chamber between a big tooth and the second gear teeth till another big tooth passes over the inlet port 6. Afterwards the liquid in the chamber between two big teeth travels in constant quantity till the next big tooth passes over the outlet port 7. Then the liquid is discharged through the outlet port 7, because the volume of the liquid bounding chamber continuously decreases. The liquid is delivered through the cavities of the second gear too. The gear meshing eliminates the liquid opposite flow from discharge zone to suction zone. Because of the high volume of the chamber between two opposite big teeth of the first gear, the pump has high admission and compression ratio, which reduces volumetric losses, provides high suction head and enables to deliver high viscous liquids. Since the gears have a lot of small teeth (rated), more teeth are engaged in meshing, which improves meshing hermeticity and volumetric efficiency accordingly. The pump can be used in hydraulic machines as pump and hydraulic motor and can deliver lubricants, liquid fuel and other liquids as well. The pump can be used as compressor to compress gases like refrigerants in refrigerating systems, air, various gases in chemical industry etc. It can be used as pneumatic motor too. Claim
The purpose of the invention is to improve the gear pump design so, that it will have relatively high admission and compression ratio to enhance its volumetric efficiency and to enable its usage as compressor. The pump has gears 1 and 2, which are in pin connection with case 3 through shafts 4 and 5. The case has inlet 6 and outlet 7 ports. The gears have many small teeth 8. The first gear 1 has two opposite big teeth 9, whereas the second gear 2 has two opposite big cavities 10. The pitch of big teeth and big cavities is greater than the pitch of small teeth in 3, 5, 7 or more times. The contours of all teeth and big cavities have the same pitch diameter 11. The gears are mounted against each other in the case in such a way that a big tooth of the first gear meshes with a big cavity of the second gear. The pump operates in the following way: The actuator 12 rotates the first gear 1 through shaft 4. The second gear 2 is rotated from the first gear 1 through meshing. When the pump rotates in the mentioned direction of Fig. 2, the liquid is filled through inlet port 6 into continuously increasing chamber between a big tooth and the second gear teeth till another big tooth passes over the inlet port 6. Afterwards the liquid in the chamber between two big teeth travels in constant quantity till the next big tooth passes over the outlet port 7. Then the liquid is discharged through the outlet port 7, because the volume of the liquid bounding chamber continuously decreases. The liquid is delivered through the cavities of the second gear too. The gear meshing eliminates the liquid opposite flow from discharge zone to suction zone. Because of the high volume of the chamber between two opposite big teeth of the first gear, the pump has high admission and compression ratio, which reduces volumetric losses, provides high suction head and enables to deliver high viscous liquids. Since the gears have a lot of small teeth (rated), more teeth are engaged in meshing, which improves meshing hermeticity and volumetric efficiency accordingly. The pump can be used in hydraulic machines as pump and hydraulic motor and can deliver lubricants, liquid fuel and other liquids as well. The pump can be used as compressor to compress gases like refrigerants in refrigerating systems, air, various gases in chemical industry etc. It can be used as pneumatic motor too. Claim
Gear Pump with Different Teeth consists of a case, a pair of meshing cylindrical gears in it, two ports in the case: one for the liquid suction and the other one for the liquid discharge. One of the gears rotates from actuator. The teeth of the gears have the same pitch diameter.
In addition, the first gear has two opposite big teeth, while the second gear has two opposite big cavities having the pitch greater than pitch of small teeth in 3, 5, 7 or more times. The addendum diameter of big teeth is greater than the addendum diameter of small teeth, whereas the dedendum diameter of big cavities is taken so, that a big tooth of the first gear can easily mesh with a big cavity of the second gear.
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