Pump unit and handheld high-pressure washer

Abstract

The invention relates to a pump unit and a handheld high-pressure washer applying the same. The pump unit comprises a water inlet cavity, a middle cavity communicating with the water inlet cavity as well as a water outlet cavity communicating with the middle cavity, wherein the middle cavity comprises a crank-connecting rod cavity and a plunger cavity which communicate with each other, a water inlet check valve is arranged between the water inlet cavity and the plunger cavity, and a water inlet valve controlled manually to open and close is arranged between the water inlet cavity and the waterinlet check valve; a water outlet check valve is arranged between the water outlet cavity and the plunger cavity; and the pump unit also comprises a plunger arranged in the plunger cavity and a crank-link mechanism arranged in a crank-link cavity and connected with the plunger, and the crank-link mechanism drives the plunger to reciprocate linearly in the plunger cavity. The pump unit and the high-pressure washer are compact in structure, high in bearing capacity, can control water inlet and realize self-priming, can be connected with tap water and are portable products convenient to carry and use.

Description

technical field [0001] The invention relates to the field of cleaning technology, in particular to a pump unit and a hand-held high-pressure cleaner using the pump unit. Background technique [0002] In people's daily life, with the improvement of people's quality of life, there is more and more demand for water cleaning. If you wash it directly with tap water, it is difficult to clean it completely due to the low pressure of the water flow, and the water consumption is large. Therefore, Various types of traditional AC high-pressure cleaning equipment have appeared, which can spray high-pressure water flow, can easily remove dirt attached to the surface of the cleaning object, and have high cleaning efficiency and water saving. However, this type of cleaning equipment needs to be connected to tap water and power supply , if there is no available power supply or running water source near the cleaning object, it is difficult to use this type of equipment. Therefore, a high-pre...

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Problems solved by technology

[0004] 1. For some DC seat cleaning machines, the water pump and the spray gun are designed separately. The water pump is set in the seat type casing, and a high-pressure outlet pipe is drawn from the pump to connect to the spray gun. The water pump of this type of machine is usually a swash plate In the type plunger pump, the plunger is reset by the return spring, and the swash plate must overcome the spring resistance to push the plunger upward during operation, so that its mechanical efficiency is greatly lost. For DC products, the proportion of useless work generated is too high , the battery utilization rate is very low, and the volume and weight are large, so it is inconvenient to move in real time;

[0005] 2. In the current cleaning equipment, the water pump or the entire cleaning machine system usually does not have a valve to control the on-off of the water inlet. When using a pressurized water source, such as tap water, even if the equipment is not turned on, the water will be sprayed from the nozzle of the cleaning machine. There is water everywhere, and when the pump is not working, the water in the pump is easy to flow back and flow into the water source, polluting the tap water source

[0006] 3. Some cleaning equipment is hand-held, and the structure of this type of equipment is relatively compact, but its crank is a cantilever-type eccentric structure, so its eccentric structure is weak in strength and limited in carrying capacity, so it can only be used for a small pressure. If you want to increase the load capacity, its water pump structure will be relatively large, losing its compact advantage, so it can only be used as a water pump with a small flow rate

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