WO2007140679A1

WO2007140679A1 - A gear pump

Info

Publication number: WO2007140679A1
Application number: PCT/CN2007/000759
Authority: WO
Inventors: Lingyu Dong
Original assignee: Lingyu Dong
Priority date: 2006-05-30
Filing date: 2007-03-09
Publication date: 2007-12-13
Also published as: CN1873228A

Abstract

A gear pump for conveying pulpy food raw material includes a pump body, a pump cover and a pair of meshed driving gear and driven gear which are assembled therebetween. Said driving gear and driven gear are made up of stainless steel material or stainless steel powder metallurgical material. An O-ring seal is provided on each of the two end faces of the driving gear and the driven gear and said O-ring seal is concentric with the axes of the respective gear shaft. Therefore the gaps between two end faces of the driving gear and the driven gear and the pump body and the pump cover can be respectively filled up with O-ring seals.

Description

Gear pump

[Technical Field]

The present invention relates to a transfer pump, and more particularly to a gear pump suitable for conveying a slurry of a food material, and also for conveying oil or other fluid.

【Background technique】

At present, some food raw materials, such as the delivery of ice cream slurry, need to be mixed with the air under a certain pressure, so it needs to be realized by a gear pump type pump. However, the gear pump used as the raw material for conveying food must not only meet the food hygiene standards, but also be able to adapt to the slurry fluid with a certain corrosiveness mixed with fine sand particles. Therefore, the gear pump needs to have good wear resistance and resistance. Corrosion performance. Since the pump sealing pressure is higher as the pump seals higher, the gap between the gear and the gear pump must be designed to be very small in order to achieve the pressure required for the gear pump when designing the gear pump. The sealing performance of the pump can achieve the output pressure requirement of the pump, which inevitably produces the running friction problem in the close cooperation of the non-oily fluid. In order to accommodate the need for running friction in such a close fit, existing gear pumps typically consist of a pump body and front and rear pump covers and a pair of meshing gears assembled therein. Generally, the sealing performance of the pump is improved by providing a seal on the front and rear end covers by inserting the sliding sleeve or by providing a skeleton seal in front of the bearing. Most of the materials used in the pump body are made of stainless steel, and the gear material is made of copper-based alloy material or non-metal material. This type of gear pump is not only complicated in structure, but also difficult to replace the seal. Moreover, the gear made of copper-based alloy material has poor corrosion resistance. The gear made of non-metallic material has poor wear resistance and short service life. The running friction of the pump is tightly matched. Such as If the gears assembled in the stainless steel pump body are also made of steel materials with good wear resistance and corrosion resistance, such as stainless steel, the gears working in the food raw material slurry cannot be operated like in oil medium. The gear pump produces an oil film between the gear and the pump body to reduce friction. When the above gear pump is working, the high-speed rotating gear can easily cause friction between the gear end face and the same metal on the surface of the pump body, so noise will occur, causing scratches on the pump body, and even metal powder contaminated by the wear of the food. . Therefore, how to improve the sealing performance and service life of food machinery gear pumps has always been a problem that people want to solve and difficult to solve.

[Summary of the Invention]

The object of the present invention is to provide a gear pump, which solves the problems of complicated structure, poor sealing, and end face friction of the existing gear pump, has reasonable structural design, reduces production cost, increases pump output pressure, and improves pump Sealing performance and gear wear resistance and corrosion resistance significantly extend pump life.

The object of the present invention is achieved as follows: The device comprises a pump body and a pump cover and a pair of meshing main and driven gears assembled therein, the technical points of which are: a main body made of stainless steel material or stainless steel powder metallurgy material, The two end faces of the driven gear are respectively provided with 0-shaped sealing rings concentric with the axes of the respective gear shafts, and the 0-shaped sealing rings respectively fill the gap between the two end faces of the driving gear and the driven gear and the pump body.

Since the invention is improved on the structure of the existing gear pump, the main and driven gears of the pump are made of stainless steel material or stainless steel powder metallurgy material, and the two end faces of each gear are respectively arranged concentric with the axis of the respective gear shaft. The 0-shaped sealing ring and the 0-shaped sealing ring respectively fill the gap between the two end faces of the driving gear and the driven gear and the pump body and the pump cover, so the structure design is reasonable, and the 0-shaped sealing ring and the pump body can be The surface of the pump cover is in contact with the seal to avoid the gear end face and the pump body, The surface of the pump cover is in direct contact, preventing friction between the same metal, and achieving dynamic gap-free sealing of the gear end face and the pump body and the pump cover surface. Due to the elasticity of the sealing ring, the friction loss of the sealing ring can be automatically compensated. The sealing ring is cheap and easy to replace, so that the output pressure of the pump can be increased while reducing the production cost, thereby improving the sealing performance of the pump and the gear. Its wear resistance and corrosion resistance significantly extend the life of the pump. Therefore, the present invention fundamentally solves the complicated problems of the conventional gear pump, such as complicated structure, poor sealing, and end face friction, and provides an ideal gear pump for conveying a corrosive slurry fluid.

[Description of the Drawings]

The invention is further described below in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of a split structure of the present invention.

Figure 2 is a schematic view of an assembly structure of the present invention.

Figure 3 is a side view of Figure 1.

The serial number in the figure shows: 1 shaft seal, 2 pump body, 3 overflow hole, 4 drive gear, 5 driven gear, 60-shaped seal ring, 7 pump seal ring, 8 pump cover, 9 discharge port, 10 seal Ring, 11 discharge joint, 12 fastening nut, 13 rubber stopper, 14 discharge tube, 15 regulator spring, 16 seal ring, 17 suction tube, 18 open positioning pin, 19 oil bearing (powder metallurgy), 20 oily Bearing (powder metallurgy), 21, driven shaft; 22 locating pin, 23, overflow hole, 24 cotter pin, 25 feed hole.

【detailed description】

The specific structure of the present invention will be described in detail based on Figs. The apparatus includes a pump body 2 and a pump cover 8 and a pair of meshing drive gears 4, driven gears 5, relief valves and the like assembled therein. The main and driven gears 4 and 5 are made of stainless steel or stainless steel powder metallurgy materials, and the specifications and models are determined according to actual needs. Pump body 2, pump cover 8 and its fastening nut 12, shaft seal 1, pump seal 7, discharge The structure of the tube 14 and the relief valve and the like is substantially the same as that of the existing gear pump. The relief valve is assembled from rubber plug 13, pressure spring 15, sealing ring 16, suction tube 17, and the like. A closed container formed by the pump chamber between the pump body 2 and the pump cover 8 is provided with a discharge port 9, and the discharge port 9 is connected to the elbow 14 through a 10 seal ring and a discharge joint 11. The two end faces of the main and driven gears 4, 5 are respectively provided with O-rings 6 concentric with the axes of the respective gear shafts, and the O-rings 6 are higher than the gear end faces by a certain distance, so that they satisfy the sealing requirements. Excessive friction is not generated, and the O-ring 6 is filled with the gap between the two end faces of the driving gear 4 and the driven gear 5 and the pump body 2 and the pump cover 8, respectively. The suction pipe 17 can be used in combination with the rubber stopper 13 of the relief valve, the pressure regulating spring 15, and the sealing ring 16 as shown in FIG. 1; it can also be used separately, and the suction pipe 17 can be assembled in the driving gear located in the pump body 2. 4 Below, the rubber plug 13, the pressure spring 15, and the seal ring 16 of the relief valve are still in the position shown in Fig. 1, and the plunger is replaced by a plunger instead of the suction tube 17. The positioning pin 22 and the opening positioning pin 18 and the fastening nut 12 are used for positioning when the pump body 2 and the pump cover 8 are assembled and connected, and the pin opening is used for circumferential positioning of the gear pump when it is mounted on other equipment. The driving shaft (not shown) is matched with the driving gear 4 through the oil bearing 19, and is axially positioned to reduce the wear of the shaft and improve the service life of the shaft. The driven shaft 21 is engaged with the driven gear 5 through the oil-impregnated bearing 20 to reduce the friction between them and improve the service life of the shaft and the gear. The overflow hole 23 is an overflow hole used in a state in which the relief valve and the suction pipe 17 are combined, and the overflow hole 3 is an overflow hole used when the relief valve is separately installed from the suction pipe 17. The split pin 24 is used to fix the suction tube 17 to the pump cover and to circumferentially position the feed holes of different diameters on the suction tube 17. The feed hole 25 is a feed hole machined on the pump cover 8. When the feed holes of different pore sizes on the suction pipe 17 coincide with the feed holes 25 on the pump cover 8, the feed passage is closed, and the rotation of the suction pipe 17 allows the different diameters of the suction pipe 17 to enter. The orifice coincides with the feed orifice 25 on the pump cover 8 to vary the feed flow rate for the purpose of adjusting the ratio of slurry to air. When the pump is in operation, the O-ring 6 mounted on the gear rotates coaxially with the gear, and the elastic 0-shaped sealing ring 6 fills both end faces of the driving gear 4 and the driven gear 5 and the pump body 2 and the pump cover 8 The gap between the surfaces makes the O-ring 6 contact with the surface of the pump body 2 and the pump cover 8, thereby preventing the gear end surface from directly contacting the surface of the pump body 2 and the pump cover 8, thereby preventing the occurrence of the same metal. Friction. The elasticity of the O-ring 6 can automatically compensate for the friction loss of the O-ring, and the dynamic non-gap seal of the gear end face and the surface of the pump body 2 and the pump cover 8 can be realized, and the sealing performance of the pump is improved. The O-ring seal 6 is worn out, and it is economical and convenient to take it off and replace it with a new one. Designers can choose any alloy steel material that meets the requirements of food hygiene and wear resistance and corrosion resistance to make gears, making the performance and life of the gear pump easier to meet various user needs.

The working principle of the pump is: when the driving gear 4 rotates clockwise to drive the driven gear 5 to rotate counterclockwise, the pump chamber between the pump body 2 and the pump cover 8 has a vacuum effect due to its sealing property, and the raw material of the slurry is used. It is sucked into the pump chamber from the suction tube 17, and is carried by the driving gear 4 to the discharge port 9 and pressed into a closed container connected to the elbow 14 for processing. At the same time, the driven gear 5 sucks the air required for food production from the overflow hole 23 or the overflow hole 3 into the pump chamber, and presses it into the closed container to fully mix with the raw material of the food slurry, thereby making it bulky and delicious. food. When the pressure of the closed system of the pump reaches the specified value, the regulator spring 15 of the relief valve is compressed, the overflow hole 23 or the overflow hole 3 is opened, and the slurry discharges outside the closed container of the pump, the pressure of the container begins to fall back, when the pump is sealed When the container pressure falls back to the set value, the spring 15 of the relief valve returns to the initial state, and the overflow hole 23 or the overflow hole 3 is closed again, so that the reciprocating cycle maintains the corresponding pressure of the closed container. When the suction pipe 17 is used in combination with the rubber stopper 13, the pressure spring 15, and the seal ring 16 of the relief valve as shown in Fig. 1, the overflow hole 23 is used; when used separately, the overflow hole 3 is used.

The device is used in the same way as existing gear pumps.

Claims

Rights request

A gear pump comprising a pump body and a pump cover and a pair of meshing main and driven gears assembled therein, characterized in that: two of main and driven gears made of stainless steel or stainless steel powder metallurgy material The end faces are respectively provided with 0-shaped sealing rings concentric with the axes of the respective gear shafts, and the 0-shaped sealing rings respectively fill the gap between the two end faces of the driving gear and the driven gear and the pump body and the pump cover.