PL68721Y1 - External gear pump - Google Patents

Description

Pattern description

The object of the utility model is a gear pump with external gearing, used especially in hydraulic systems and lubrication systems.

The gear pump known from the Polish patent application No. 316090 has needle bearings, leaks from the pressure chamber are discharged to the pump suction opening through channels made in the plate and the body, reducing the path and reducing the flow resistance. In particular, the pump chamber has been designed with compression zones that allow more medium to be compressed over a longer distance between the pump gears, thereby increasing its efficiency.

A high-capacity gear pump for pumping high-viscosity fluids is known from the Polish patent specification No. 194708. In the pump, between each of the gears and the inner walls of the chamber there are compression zones, which have a thickness that varies along the gears. The shape of the compression zones means that the viscous fluid sucked in due to the rotation of the gears is forced in the direction of rotation of the gears into a gradually narrowing gap. The fracture ends with a gentle cut-off of fluid flow with the start of the sealed zone. The shape of the compression zones helps to increase the amount of viscous fluid injected and to compress it. The fluid is pumped between the teeth of the gearbox, which facilitates the complete filling of the space between them. The pump is more efficient than known pumps and can operate over a greater speed range and over a relatively greater fluid viscosity range.

Gear pumps known from use have a body in which a suction opening is made, connected through a working chamber in which two gears work with a discharge opening. In these pumps, to compensate for backlash on the side surfaces of gears resulting from high working pressure, floating bearing blocks are used, which, despite changes in the internal dimensions of the body, are pressed against the side surfaces of the gears with the working pressure of the pump.

The essence of the pump, according to the formula, consists in the fact that on the entire width of the gears in their top part, there are sockets in the form of slots with parallel walls, the lower part of which is widened and constitutes a longitudinal opening, while sealing elements are slidably mounted in the sockets. with widened lower part.

Preferably, the widened lower part of the sealing element is circular in cross section and is seated in the oblong hole of the circular socket, the opening diameter being greater than the lower part of the sealing element.

Preferably, the widened lower part of the sealing element has a rectangular cross-section and is seated in the oblong opening of the rectangular socket, the opening depth being greater than the height of the lower part of the sealing element. The usefulness of the pattern lies in the fact that the sealing elements mounted in the seats made at the top of the gears compensate for the increase in radial clearances caused by stresses in the pump housing due to the centrifugal force, which has a positive effect on the pump performance and increases its efficiency.

The object of the utility model is shown in the drawing, in which Fig. 1 shows a gear pump with external meshing, Fig. 2 - sealing elements with a rectangular widened lower part embedded in the tooth sockets, and Fig. 3 - sealing elements with a circular widened lower part embedded in tooth sockets.

The gear pump with external gearing has a casing 1 in which a suction opening 2 is made, connected through a working chamber 3 in which two gear wheels 4 work with a discharge opening 6. The entire width of gear wheels 4 in their top part is seats 7 in the form of parallel-walled slots, the lower part of which is widened and constitutes a longitudinal opening, and sealing elements 5 with a widened lower part are slidably mounted in the seats 7. Moreover, the widened lower part of the sealing element 5 has a circular cross section and is seated in the oblong hole of the circular seat 7, with the diameter of the opening greater than the lower part of the sealing element 5. In a further embodiment of the pattern, the external meshing gear pump is made as before. , with the difference that the widened lower part of the sealing element 5 has a rectangular cross-section 1 is seated in a rectangular longitudinal slot 7 of the socket 7, the hole depth being greater than the height of the lower part of the sealing element 5.