Refueling gun

1. A refueling gun, comprising:

a housing, wherein a pump body is provided within the housing, the pump body is connected to an oil intake pipe and an oil outlet pipe, and a first check valve through which oil is delivered into the pump body is provided within the oil intake pipe;

a valve rod, wherein the valve rod penetrates into the pump body, an end portion of the valve rod located in the pump body is connected to a negative pressure generating assembly, the negative pressure generating assembly comprises a disk, a plurality of limiting members that are fixed to the same side of the disk and that are distributed circumferentially, and a sealing ring, the disk is fixedly connected to an end portion of the valve rod, the plurality of limiting members and the valve rod are distributed on two sides of an axial direction of the disk, the sealing ring is sleeved on the periphery of the plurality of limiting members, the sealing ring is capable of reciprocating along the limiting member, a sliding direction of the sealing ring is perpendicular to a surface of the disk, the sealing ring is capable of sealingly abutting against the disk after sliding in the direction toward the disk, and the sealing ring is slidingly connected to an inner wall of the pump body and is sealingly connected to the inner wall of the pump body; and

a handle, wherein the handle is rotatably provided on the housing and is connected to the valve rod by means of a connecting assembly so as to drive the valve rod to reciprocate within the pump body.

2. The refueling gun according to claim 1 , wherein the housing comprises two half housings, the two half housings are detachably spliced and fixed, a grip hole is provided in the housing, and a grip end of the handle is located in the grip hole.

3. The refueling gun according to claim 1 , wherein the housing is provided with a locking assembly configured to relatively statically lock the handle on the housing.

4. The refueling gun according to claim 3 , wherein the locking assembly comprises an elastic member, a blocking piece, and an abutting block that are disposed in the housing, the blocking piece is fixedly connected to an end portion of the elastic member, the abutting block is fixedly connected to the blocking piece, a grip end of the handle is provided with an abutting groove, and the abutting block abuts against the abutting groove.

5. The refueling gun according to claim 4 , wherein a side surface of the abutting block opposite the grip end of the handle is an arcual inclined surface, and the grip end of the handle is slidable along the inclined surface.

6. The refueling gun according to claim 4 , wherein the elastic member is of a spring structure.

7. The refueling gun according to claim 2 , wherein the grip end of the handle is provided with a plurality of grip grooves.

8. The refueling gun according to claim 2 , wherein the connecting assembly comprises a first connecting block, a second connecting block, and a third connecting block, another end of the handle away from the grip end is hinged with the first connecting block, the first connecting block is hinged with the second connecting block, the second connecting block is hinged with the third connecting block, and the third connecting block is hinged with the valve rod.

9. The refueling gun according to claim 1 , wherein the limiting member comprises a vertical section perpendicular to the surface of the disk and a horizontally extending section that bends along a free end of the vertical section and horizontally extends in a direction leaving a center of the disk, and the sealing ring sleeves the vertical section.