Patent Application
20130108500
1. Field of the Invention
This invention relates generally to displacement pumps, and more specifically, a replaceable functional hardware assembly for use in a pump.
2. Description of the Related Art
The prior art inventions include several versions of displacement pumps, which have complex inner workings. There is a need, however, for a pump mechanism that can undergo immediate repairs or replacement in industries such as farming, military use, and process industries, for example industrial cleaning and maintenance use. In this way, the invention overcomes issues in the prior art with rebuilding pumps, specifically, that rebuilding a pump requires it to be removed from the work site and into a workshop, typically requiring several hours or days.
The present invention solves the problems in the industry by providing a replaceable cassette pump assembly. By imparting the functional elements of a pump in a replaceable cartridge, the present invention permits a pump to be repaired on-site.
The invention is a pump assembly component formed as a cassette that is inserted into a bore in a cam block. The invention allows a pump to be repaired within seconds at the point of operation. The cassette unit has a tapered end region for communication with a pump cam wall to translate pressure to the cam and hold the cassette into the cam.
In describing the preferred embodiment of the invention which is illustrated in the drawings, specific terminology will be resorted to for the sake of clarity. However, it is not intended that the invention be limited to the specific term so selected and it is to be understood that each specific term includes all technical equivalents which operate in a similar manner to accomplish a similar purpose.
With reference initially to
When the pump is operating, a portion of the fluid introduced into the inlet port flows from opening into the secondary inlet passage and continues to flow to the inlet passage opening. An outlet passage extends through the housing, to an outlet port.
Note that a portion of the outlet passage extends through the housing behind the internal cavity.
A cylinder O-ring is mounted circumferentially on the cassette within the housing. A spring engages the housing and pivotally biases the cassette for easy removal of the cassette from the cam bore upon removal of the bushing at a tapered end. Accordingly, a new cassette can be inserted into the place and the tapered head bushing is then tapped with a tool such as a hammer. In this way, the cassette becomes fixed in the cam bore.
The cassette becomes fixed in the bore through the slightly smaller diameter of the bore inner surface interaction with the outer surface of the tapered head. This extremely tight pressure fit imparts the ability of a pump to withstand an exponential increase in the pressure created by fluid flow.
The invention is a cassette pump that inserts into a cam head receptacle. The cassette has a body with a tapered portion. An opposing intake portion of the tapered head faces an offset cam impeller. The tapered head of the cassette permits a self-sealing locking effect for the cassette. A check valve controls the direction of the pressure created.
In the preferred embodiment for the invention, the assembly is composed of PVC and bronze components. A bushing attaches to the tapered end of the cassette 10. The bushing abuts the pump body.
The present invention is being described in the context of a fluid pump. However it should be appreciated that the novel concepts of this invention have application to a wide variety of pumps for other fluids and equipment.
While certain preferred embodiments of the present invention have been disclosed in detail, it is to be understood that various modifications may be adopted without departing from the spirit of the invention or scope of the following claims.
