CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims all benefits accruing under 35 U.S.C. § 119 from China Patent Application No. 201911058741.4, filed on Nov. 1, 2019, in the China National Intellectual Property Administration, the content of which is hereby incorporated by reference.

TECHNICAL FIELD

The present disclosure relates to the field of carburetors, and in particular, to dual-purpose oil and gas carburetors.

BACKGROUND

An oil and gas carburetor, also known as dual fuel carburetor, can use two fuels (oil and gas). In the prior art, the oil and gas carburetor can include a thimble and a main nozzle. The main nozzle is provided with a main measuring hole, and the thimble can be configured for opening and closing the main measuring hole to open or close a fuel passage. The main measuring hole, regarded as a measuring cup, can control the amount of fuel entering a carburetor mixing chamber. The thimble frequently contacting the main measuring hole will easily cause the main measuring hole to wear down and decrease precision of the main measuring hole. In addition, because the thimble and the main nozzle are independent, the coaxiality between the thimble and the main measuring hole is poor and the sealing effect is poor.

SUMMARY

An embodiment of the present disclosure includes a carburetor, including a body and a float base connected to the body. The float base includes a float chamber. The body is provided with a fuel passage and an oil passing passage, and the fuel passage communicates with the float chamber. The carburetor further includes a magnetic sleeve assembly, a magnet assembly and a thimble assembly. The magnetic sleeve assembly is fixed to the float base and a first end of the magnetic sleeve assembly extends into the oil passing passage and is connected to the body. The first end of the magnetic sleeve assembly is provided with a fuel passing hole and a passage, the fuel passing hole communicates with the float chamber. The passage communicates with the oil passing passage. Both the thimble assembly and the magnet assembly are installed in the magnetic sleeve assembly. The thimble assembly is configured for cutting off the passage under driving of the magnet assembly, in order to cut off a communication between the oil passing passage and the float chamber.

Furthermore, the magnetic sleeve assembly is further provided with a first mounting hole and a second mounting hole separated from each other. The magnet assembly includes a first magnet and a second magnet. The first magnet and the thimble assembly are installed in the first mounting hole. The second magnet is installed in the second mounting hole. The first magnet and the second magnet are mutually exclusive. The second magnet is movable in the second mounting hole, so that the first magnet is able to move in the first mounting hole under an action of a repulsion of the second magnet, resulting in driving the thimble assembly to cut off the passage.

Furthermore, the thimble assembly includes a thimble and an elastic member. The magnetic sleeve assembly is further provided with a third mounting hole between the passage and the first mounting hole. A first end of the thimble extends into the third mounting hole and is configured for cutting off the passage, and a second end of the thimble is located in the first mounting hole. The elastic member is installed in the first mounting hole and configured for resetting the thimble.

Furthermore, an axis of the thimble coincides with an axis of the passage.

Furthermore, the magnetic sleeve assembly includes a fixing sleeve and a connecting sleeve. The fuel passing hole and the passage are located in the connecting sleeve. The magnet assembly is installed on the fixing sleeve. The fixing sleeve and the connecting sleeve are connected with each other and both are fixed on the float base.

Furthermore, a mounting portion is located on an inner wall of the float chamber. The float chamber is divided into a first chamber and a second chamber. The mounting portion is provided with a fourth mounting hole. The fixing sleeve is located in the second chamber. One end of the connecting sleeve is connected to the fixing sleeve and the other end of the connecting sleeve penetrates through the fourth mounting hole, extends into the first chamber and is connected to the body. The passage and the fuel passing hole are located at one end of the connecting sleeve protruding into the first chamber.

Furthermore, the carburetor further includes a diaphragm assembly and a diaphragm cover. The diaphragm cover is installed on the float base. The diaphragm assembly is installed on the float base and a diaphragm chamber is formed between the diaphragm assembly and the diaphragm cover. The diaphragm assembly and the second magnet are separate from each other. The second magnet can be pushed to close to the first magnet by a movement of the diaphragm assembly.

Furthermore, the diaphragm assembly includes a diaphragm and an ejector rod. The magnetic sleeve assembly is further provided a through hole communicating with the second mounting hole. One end of the ejector rod is fixed on the diaphragm, and the other end of the ejector rod can penetrate through the through hole by the diaphragm, in order to push the second magnet toward the first magnet.

Furthermore, the diaphragm cover is provided with a gas passage. The gas passage communicates with the diaphragm chamber. When the gas passage is opened, the diaphragm vibrates under a pressure of the gas and drives the ejector rod to push the second magnet toward the first magnet.

Furthermore, the diaphragm assembly further includes a positioning block and a support plate. The support plate is fixed on one side of the diaphragm near the second magnet. The positioning block is fixed on the other side of the diaphragm near the diaphragm cover. One end of the ejector rod is fixed to the positioning block, and the other end of the ejector rod penetrates through the diaphragm and the support plate, and extends towards the magnetic sleeve assembly.

Compared with the prior art, the carburetor includes the magnetic sleeve assembly with the passage and the thimble assembly, both of which can cooperate with each other to control opening and closing of the fuel passage and the oil passing passage. Therefore, the wear down of the main measuring hole can be avoided. Moreover, coaxiality between the thimble assembly and the passage and a sealing effect can be improved because both the thimble assembly and the passage are located on/in the magnetic sleeve assembly.

