Carburetor easy to quickly start at low temperature

Abstract

The utility model relates to a carburetor easy to quickly start at low temperature, which comprises a carburetor body with a gas passage, an oil delivery pump and an oil injection port for injecting oil into the gas passage are arranged on the carburetor body, and an oil outlet end of the oil delivery pump is connected with the oil injection port through an oil path arranged on the carburetor body. The oil way is provided with a needle valve used for opening and closing the oil way, the needle valve is installed in a needle valve cavity located in the side portion of the carburetor body, the needle valve cavity is communicated with the oil spraying opening, an elastic membrane used for pushing the needle valve to open and close the oil way is arranged in the needle valve cavity, and a gland is arranged on the needle valve cavity and the elastic membrane in a covering mode. The pressing cover presses the periphery of the elastic membrane to seal the needle valve cavity, a through hole is formed in the pressing cover, an elastic pressing button is arranged in the through hole in a penetrating mode, the inner end of the elastic pressing button abuts against the elastic membrane, and the carburetor capable of being easily and rapidly started at the low temperature can be beneficial to rapidly pumping oil into the gas passing channel to achieve atomization of the oil.

Description

TECHNICAL FIELD

[0002] The utility model relates to an easy carburetor of low temperature under quick start. BACKGROUND

[0004] Carburetor is a mechanical device that mixes air and fuel in a certain proportion under the action of vacuum generated by engine operation. As a precision mechanical device, carburetor uses the kinetic energy of air flow to realize the atomization of gasoline. It can be called the "heart" of the engine because of its important role in the engine.

[0005] The engine with carburetor starts slowly in low temperature environment. For occasions where the use time is not important, the slow start of the engine is not important, but for unmanned aerial vehicles and other products, the use time is particularly important, so the slow start brings great trouble to use.

[0006] For example, Chinese patent butterfly valve type diaphragm carburetor CN221032872U, comprising: carburetor body, provided with mixed gas chamber, both ends of mixed gas chamber are provided with air inlet and air outlet respectively, air inlet and air outlet are communicated with mixed gas chamber respectively; choke valve shaft, including choke valve shaft and choke valve, choke valve shaft penetrates carburetor body and is rotatably connected with carburetor body, first sealing element is arranged between both ends of choke valve shaft and carburetor body respectively, choke valve is arranged on choke valve shaft, choke valve is arranged on air inlet, choke valve can open or close air inlet; throttle valve shaft part, including throttle valve shaft and throttle valve, throttle valve shaft penetrates carburetor body and is rotatably connected with carburetor body, second sealing element is arranged between both ends of throttle valve shaft and carburetor body respectively, throttle valve is arranged on throttle valve shaft, throttle valve is arranged on air outlet, throttle valve can open or close air outlet; the patent cannot realize quick start under low temperature. UTILITY MODEL CONTENTS

[0008] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide an easy carburetor of low temperature under quick start, which can facilitate the quick pumping of oil into the air passage and realize the atomization of oil.

[0009] The utility model discloses carburetor easy to start fast under low temperature, its characterized in that: including the carburetor body with the passage of air, be equipped with oil pump and the oil injection port of oil injection to the passage of air on the carburetor body, be equipped with the oil extraction port for connecting with the oil tank and the negative pressure port for communicating with the engine crank chamber on the oil pump, the oil outlet of oil pump is connected the oil injection port through the oil circuit that sets up on the carburetor body, be equipped with the needle valve for on-off oil circuit on the oil circuit, the needle valve is installed in the needle valve chamber at the side of carburetor body, the needle valve chamber is communicated with the oil injection port, be equipped with the elastic diaphragm for pushing the needle valve on-off oil circuit in the needle valve chamber, the needle valve chamber and the elastic diaphragm upper cover are equipped with gland, and the periphery of elastic diaphragm is pressed by gland to seal needle valve chamber, be equipped with through -hole on the gland, be equipped with elastic press button in the through -hole, the inner end of elastic press button is close to elastic diaphragm, when repeatedly manually press elastic press button, make elastic diaphragm drive needle valve open oil circuit, to let the oil material that oil pump pumps through oil circuit and needle valve chamber is communicated with oil injection port and is injected into the passage of air.

[0010] Preferably, the needle valve chamber is a concave groove, the oil circuit is communicated with the groove bottom of the concave groove of the needle valve chamber, a pry plate is installed on the needle valve, the middle part of the pry plate is rotatably connected in the concave groove of the needle valve chamber, the elastic diaphragm is installed at the slot position of the concave groove of the needle valve chamber, the edge of the elastic diaphragm is tightly pressed on the edge of the slot of the concave groove of the needle valve chamber by the gland, and a pressing block is fixedly installed at the middle position of the elastic diaphragm, the lower end of the pressing block is close to the first end of the pry plate.

[0011] Preferably, the elastic press button comprises a cylindrical sleeve passing through the through-hole of the gland, the center of the cylindrical sleeve has a communication channel communicating the inside and outside of the gland, the inner end of the cylindrical sleeve has an outward extension to limit the inner end surface of the gland, and the inner end of the cylindrical sleeve is close to the pressing block, a limiting piece is sleeved on the outer end of the cylindrical sleeve, a snap spring is installed on the limiting piece, and a compression spring is installed between the limiting piece and the gland.

[0012] Preferably, the pry plate is formed by punching a sheet, the position of the pry plate away from the first end has a hole formed by winding the sheet, a hinge shaft is arranged in the hole, the end of the hinge shaft is fixedly installed on the carburetor body, a spring is arranged between the bottom of the concave groove of the needle valve chamber and the middle position of the pry plate, the second end of the pry plate has a fork, the fork is inserted into the upper end of the needle valve, the lower end of the needle valve is blocked at the port where the oil circuit connects with the needle valve chamber, when the elastic press button is pressed, the first end of the pry plate is pushed by the cylindrical sleeve and the pressing block, the second end of the pry plate and the lower end of the needle valve are driven away from the port of the oil circuit, and the communication between the oil circuit and the needle valve chamber is realized.

[0013] Preferably, a threaded column is arranged on the pressing block, the threaded column passes through the middle part of the elastic diaphragm and is fixedly locked by a nut at the other end, a supporting piece is sleeved on the threaded column, and the supporting piece is abutted between the stepped surface of the pressing block and the elastic diaphragm.

[0014] When in low temperature environment (below 10 degrees Celsius), the engine starts, the engine rotation speed is very slow, the carburetor in the negative pressure of the engine is not enough to push the needle valve to achieve oil, the utility model discloses a spring button is installed on the gland, thereby under the condition of manual repeatedly pressing the spring button, the spring diaphragm drives the needle valve to open the oil passage, and the oil material pumped by the oil pump can pass through the oil passage and the needle valve cavity to the oil injection port and be injected into the air passage to be fully mixed with the air in the air passage.

[0015] The carburetor capable of being started quickly under low temperature of the utility model can be favorable for pumping the oil material into the air passage quickly to realize the atomization of the oil material. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the three-dimensional structure schematic diagram of one perspective of the utility model;

[0018] Figure 2 is the three-dimensional structure schematic diagram of another perspective of the utility model;

[0019] Figure 3 is the sectional view of the oil passage center line of the utility model;

[0020] Figure 4 is the partial view of Figure 3 ;

[0021] Figure 5 is the explosion view of the spring button and other components;

[0022] Figure 6 , 7 is the partial view of Figure 5 . DETAILED DESCRIPTION

[0024] The carburetor capable of being started quickly under low temperature of the utility model comprises a carburetor body 2 with an air passage 1, the air passage 1 is used for the inlet of air, the carburetor body 1 is provided with an oil pump 3 (the oil pump 3 can be a diaphragm pump, a plunger pump or a diaphragm pump, which is prior art, and the specific structure is not repeated) and an oil injection port 4 (the oil injection port 4 injects the oil material mixed with air to form atomization) for spraying oil into the air passage, the oil pump 3 is provided with an oil suction port 5 for being connected with an oil tank and a negative pressure port 6 for being communicated with an engine crank chamber, the negative pressure value is repeatedly changed with the reciprocating action of a piston in the engine crank chamber, the diaphragm switch in the oil pump 3 is reciprocated to open and close, and the oil material is sucked from the oil suction port 5 and output from the oil outlet end of the oil pump 3.

[0025] The oil outlet end of the oil pump 3 is connected with the oil injection port 4 through an oil passage 7 provided on the carburetor body 2, and the oil passage 7 is obtained by drilling a hole in the body.

[0026] The oil passage 7 is provided with a needle valve A1 for opening and closing the oil passage, the needle valve is installed in a needle valve cavity A2 located at the side of the carburetor body, the needle valve cavity A2 is communicated with the oil injection port 4, the needle valve cavity A2 is provided with an elastic diaphragm A3 for pushing the needle valve to open and close the oil passage, the needle valve cavity A2 and the elastic diaphragm A3 are covered with a gland A4, the periphery of the elastic diaphragm is pressed by the gland A4 to seal the needle valve cavity A2, in the prior art, the engine has a negative pressure in the air passage after the engine is started, the negative pressure drives the elastic diaphragm to open the needle valve to block the oil passage through the oil injection port, but due to the slow starting speed of the engine at low temperature, the negative pressure value is low and insufficient to drive the elastic diaphragm to drive the needle valve to act.

[0027] Therefore, the elastic pressing button A6 is provided on the gland A4, the elastic pressing button A6 is provided in the through hole A5, the inner end of the elastic pressing button A6 is close to the elastic diaphragm A3, when the elastic pressing button is repeatedly pressed manually, the elastic diaphragm drives the needle valve to open the oil passage, so that the oil pumped by the oil pump can pass through the oil passage and the needle valve cavity to the oil injection port and be injected into the air passage.

[0028] When the engine is started in a low temperature environment (below minus 10 degrees Celsius), the engine rotates slowly, the negative pressure of the engine in the carburetor is insufficient to push the needle valve to realize oil inlet, the utility model is provided with the elastic pressing button on the gland, so that the elastic diaphragm drives the needle valve to open the oil passage under the condition of repeatedly pressing the elastic pressing button manually, the oil pumped by the oil pump can pass through the oil passage and the needle valve cavity to the oil injection port and be injected into the air passage, so as to fully mix with the air in the air passage, which is beneficial to realize the rapid starting of the engine.

[0029] Specifically, the needle valve cavity A2 is a concave groove, the oil passage 7 is communicated with the groove bottom of the needle valve cavity concave groove, the needle valve is provided with a pry plate A7, the middle part of the pry plate A7 is rotatably connected in the needle valve cavity concave groove, the elastic diaphragm A3 is installed at the groove position of the needle valve cavity concave groove, the edge of the elastic diaphragm A3 is tightly pressed on the edge of the groove of the needle valve cavity concave groove by the gland A4, the middle part of the elastic diaphragm A3 is fixedly installed with a pressing block A8, the inner end of which is close to the first end of the pry plate A7, when the elastic pressing button is repeatedly pressed manually, that is, the pressing block A8 is repeatedly pushed, the needle valve A1 is pried by the pry plate A7, so that the oil passage is unblocked.

[0030] Specifically, the elastic pressing button A6 includes a cylindrical sleeve A9 penetrating the through hole of the gland, the center of the cylindrical sleeve has a communication hole A10 communicating the inside and outside of the gland, the inner end of the cylindrical sleeve A9 has an outward extension A11 limiting the inner end surface of the gland, and the inner end of the cylindrical sleeve is close to the pressing block, the outer end of the cylindrical sleeve is sleeved with a limiting piece A12, the limiting piece is provided with a snap spring A13, the limiting piece and the gland are provided with a compression spring A14, and the cylindrical sleeve A9 is restored by the compression spring A14.

[0031] Wherein the pry plate A7 is formed by sheet stamping, the position of the pry plate away from the first end has a channel shaped by sheet winding, a hinge shaft A15 is threaded in the channel, the end of the hinge shaft A15 is fixedly installed on the carburetor body, a spring A16 is arranged between the bottom of the recessed groove of the needle valve cavity and the middle position of the pry plate (the spring A16 acts to keep the lower end of the needle valve to block the port A18 under no external force), the second end of the pry plate has a fork A17, the fork is inserted into the upper end of the needle valve, the lower end of the needle valve blocks the port A18 where the oil path meets the needle valve cavity, under the pressing of the elastic pressing button, the first end of the pry plate is pushed by the cylindrical sleeve and the pressing block, the second end of the pry plate and the lower end of the needle valve are driven away from the port of the oil path, and the oil path is communicated with the needle valve cavity.

[0032] Wherein the pressing block A8 is provided with a threaded column A19, the threaded column passes through the middle part of the elastic diaphragm and is locked and fixed at the other end by a nut A20 (which is a circular sheet shape), a supporting sheet A21 is sleeved on the threaded column, the supporting sheet abuts between the stepped surface of the pressing block and the elastic diaphragm, the supporting sheet A21 is a circular sheet, and a plurality of through circular holes are formed in the supporting sheet A21, so that the supporting sheet A21 can have a larger supporting area.

[0033] The above only describes the preferred embodiments of the present application, and any changes and modifications made within the scope of the present application should be included in the scope of the present application.

Claims

1. A carburetor that is easy to start quickly at low temperatures, characterized in that: The carburetor includes a carburetor body with an exhaust passage. The carburetor body is equipped with a fuel pump and a fuel injector for injecting fuel into the exhaust passage. The fuel pump has a suction port for connecting to the fuel tank and a negative pressure port for communicating with the engine crankshaft chamber. The fuel outlet of the fuel pump is connected to the fuel injector via a fuel line on the carburetor body. A needle valve for opening and closing the fuel line is installed in a needle valve chamber located on the side of the carburetor body. The needle valve chamber communicates with the fuel injector. The needle valve cavity is equipped with an elastic diaphragm for actuating the needle valve to open and close the oil passage. The needle valve cavity and the elastic diaphragm are covered with a pressure cap. The pressure cap presses against the periphery of the elastic diaphragm to seal the needle valve cavity. The pressure cap is provided with a through hole, and an elastic push button passes through the through hole. The inner end of the elastic push button is close to the elastic diaphragm. When the elastic push button is pressed repeatedly by hand, the elastic diaphragm drives the needle valve to open the oil passage, so that the oil pumped by the oil pump can pass through the oil passage and the needle valve cavity to the oil injection port and be injected into the air passage.

2. The carburetor that is easy to start quickly at low temperatures according to claim 1, characterized in that: The needle valve cavity is a concave groove, and the oil passage is connected to the bottom of the concave groove of the needle valve cavity. A skid is installed on the needle valve, and the middle part of the skid is rotatably hinged in the concave groove of the needle valve cavity. The elastic diaphragm is installed at the groove opening of the concave groove of the needle valve cavity, and the edge of the elastic diaphragm is pressed tightly against the edge of the groove opening of the concave groove of the needle valve cavity by a pressure cap. A pressure block with its lower end close to the first end of the skid is fixedly installed at the middle position of the elastic diaphragm.

3. The carburetor that is easy to start quickly at low temperatures according to claim 2, characterized in that: The elastic push button includes a cylindrical sleeve passing through the through hole of the pressure cover. The center of the cylindrical sleeve has a connecting channel connecting the inside and outside of the pressure cover. The inner end of the cylindrical sleeve has an outwardly extending portion to limit it to the inner end face of the pressure cover, and the inner end of the cylindrical sleeve is close to the pressure block. The outer end of the cylindrical sleeve is fitted with a limiting piece, and a retaining spring is installed on the limiting piece. A compression spring is installed between the limiting piece and the pressure cover.

4. The carburetor that is easy to start quickly at low temperatures according to claim 3, characterized in that: The skid is formed by stamping a sheet metal. A channel formed by winding the sheet metal is located on the skid away from its first end. A hinge shaft passes through this channel, and its end is fixedly mounted on the carburetor body. A spring is provided between the bottom of the concave groove of the needle valve cavity and the middle position of the skid. The second end of the skid has a fork that inserts into the upper end of the needle valve. The lower end of the needle valve blocks the port connecting the oil passage and the needle valve cavity. When the elastic push button is pressed, the first end of the skid is pushed through the cylindrical sleeve and pressure block, causing the second end of the skid and the lower end of the needle valve to move away from the port of the oil passage, thus achieving communication between the oil passage and the needle valve cavity.

5. The carburetor that is easy to start quickly at low temperatures according to claim 4, characterized in that: The pressure block is provided with a threaded post, which passes through the middle of the elastic diaphragm and is locked and fixed at the other end by a nut. A support plate is sleeved on the threaded post, and the support plate abuts between the stepped surface of the pressure block and the elastic diaphragm.

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