Carburetor capable of preventing low-temperature failure

Abstract

The utility model relates to a carburetor capable of preventing low-temperature failure, which is characterized by comprising 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 pumping port for being connected with an oil tank and a negative pressure port for being communicated with a crankshaft chamber of an engine are arranged on the oil delivery pump. The oil outlet end of the oil delivery pump is connected with the oil injection port through an oil way arranged on the carburetor body, and an electric heating body for heating the carburetor body, the oil way and the gas passing channel is embedded in the carburetor body, so that the situation that atomization of fuel is affected by frosting of the carburetor body, the oil way and the gas passing channel is avoided. The carburetor capable of preventing low-temperature failure can avoid the situation that the carburetor cannot normally atomize oil due to low temperature.

Description

Technical field:

[0002] The utility model relates to a carburetor which is resistant to low temperature failure. Background technology:

[0004] A carburetor is a mechanical device that mixes gasoline and air in a certain proportion under the vacuum created by the engine. As a sophisticated mechanical device, the carburetor utilizes the kinetic energy of the inhaled air flow to atomize the gasoline. Its crucial role in the engine can be called its "heart."

[0005] Currently, engines with carburetors usually operate at room temperature. However, as the application environment of such engines continues to expand, for example, engines with carburetors used in drones operating at high altitudes, due to the complex high-altitude environment and large temperature fluctuation range, such drones often suffer sudden engine stops working and crashes.

[0006] After repeated tests and studies, it was found that the oil atomization effect of the carburetor in high-altitude environments was poor, which resulted in the engine fuel being unable to fully work.

[0007] In addition, engines with carburetors start slowly in low-temperature environments. This is not a big deal in situations where the timing of use is not important. However, for products such as drones, where the timing of use is particularly important, slow starting can cause significant trouble.

[0008] A Chinese patent, CN220539741U, has been retrieved for a novel carburetor internal sealing and filtering device. The device comprises a carburetor body and a lower body, the carburetor body being positioned above the lower body. A pump cover gasket is positioned below the carburetor body, located between the two bodies. An oil pump diaphragm is positioned below the carburetor body, located between the two bodies. This patent replaces the raised sealing line on the bottom of the carburetor body with a groove, significantly reducing bumps and bruises during production. A separate raised sealing line is added to the original gasket, aligning precisely with the groove on the body. This creates a tight seal when tightened. The gasket is molded from rubber, eliminating bumps and bruises, reducing oil leakage and production costs. However, this patent cannot prevent the carburetor from atomizing fuel properly due to low temperatures. Utility model content:

[0010] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a carburetor that is resistant to low-temperature failure, which can prevent the carburetor from being unable to normally atomize fuel due to low temperature.

[0011] The utility model is a carburetor that prevents low-temperature failure and is characterized in that it includes a carburetor body with an air passage, the carburetor body is provided with an oil pump and an oil injection port for injecting oil into the air passage, the oil pump is provided with an oil extraction port for connecting to a fuel tank and a negative pressure port for communicating with an engine crank chamber, the oil outlet end of the oil pump is connected to the oil injection port through an oil passage provided on the carburetor body, and the carburetor body is embedded with an electric heater for heating the carburetor body, the oil passage and the air passage to prevent frost on the body, the oil passage and the air passage from affecting the atomization of the fuel.

[0012] Preferably, the electric heating body is a cylindrical electric heating rod, which is arranged near the air inlet end of the air passage, and is close to the oil circuit, while a partial section of the electric heating rod extends into the air passage.

[0013] Preferably, a through hole is provided on the wall of the carburetor body near the air inlet end of the air passage, and the through hole penetrates into the air passage from the outside of the wall, the electric heating rod penetrates the through hole and the end extends into the air passage, the axis of the through hole is perpendicular to the axis of the air passage, and the axis of the through hole intersects or is close to the axis of the air passage, and a first screw hole is provided on the carburetor body, and a first screw is installed in the first screw hole, and the end of the first screw abuts the electric heating rod to clamp and fix the electric heating rod.

[0014] Preferably, a temperature sensor is provided on the carburetor body at a position opposite to the electric heating rod, and the temperature sensor and the electric heating rod are both electrically connected to the controller to control the on and off of the electric heating rod through the sensed temperature of the temperature sensor.

[0015] Preferably, the oil transfer pump is a diaphragm pump.

[0016] Preferably, a rectangular groove is provided on the air inlet end face of the air passage on the carburetor body, the temperature sensor is provided in the rectangular groove, and a pressure plate is inserted between the side face of the temperature sensor and the first inner side face of the rectangular groove, the pressure plate having a first bent portion bent 90 degrees toward the second inner side face of the rectangular groove at one end facing the air passage, and a second bent portion bent 180 degrees in the opposite direction relative to the first bent portion at one end away from the air passage, the inner end of the first bent portion abuts the front end of the temperature sensor, and the inner end of the second bent portion abuts the outer wall surface of the carburetor body.

[0017] Preferably, a second screw hole is provided on the carburetor body, a second screw is installed in the second screw hole, and the end of the second screw abuts against the side surface of the pressure plate to clamp and fix the temperature sensor.

[0018] Preferably, the upper end surfaces of the pressure plate and the temperature sensor are lower than or flush with the intake end surface of the air passage, so as to avoid a gap between the mounting end surfaces when the carburetor body and the intake pipe are mounted.

[0019] The working principle of the carburetor for preventing low-temperature failure of the utility model is that an electric heater for heating the carburetor body, the oil circuit and the air passage is embedded in the carburetor body, that is, the carburetor body is heated to resist low temperature and frost, the oil circuit is heated to resist frost on the oil circuit and the oil, and the air passage is heated to resist the low temperature of the incoming air. That is, low temperature is resisted from three aspects, frost on the body, the oil circuit and the air passage is avoided, and the atomization effect of the fuel is guaranteed. Description of the drawings:

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention from a first viewing angle;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the first embodiment of the utility model from another perspective;

[0023] Figure 3 yes Figure 2 Partial exploded view;

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the second embodiment of the present invention from a first viewing angle;

[0025] Figure 5 yes Figure 4 Partial exploded view;

[0026] Figure 6 It is a cross-sectional view of the center line of the oil passage of the utility model;

[0027] Figure 7 yes Figure 6 A partial view of

[0028] Figure 8 It is an exploded view of components such as elastic push buttons;

[0029] Figure 9 、 10 yes Figure 8 A partial view of the . Specific implementation method:

[0031] like Figure 1-3As shown, the carburetor of the utility model that prevents low-temperature failure includes a carburetor body 2 with an air passage 1, which is used to introduce 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, etc., which is a prior art and the specific structure is not repeated) and an oil injection port 4 for spraying oil into the air passage (the oil injected by the oil injection port 4 is mixed with air to form an atomized oil). The oil pump 3 is provided with an oil extraction port 5 for connecting to the oil tank and a negative pressure port 6 for communicating with the engine crank chamber. As the piston in the engine crank chamber reciprocates, the negative pressure value changes repeatedly, and the diaphragm switch in the oil pump 3 is reciprocated and opened and closed, so that the oil is sucked from the oil extraction port 5 and output from the oil outlet end of the oil pump 3.

[0032] The oil outlet end of the oil pump 3 is connected to the fuel injection port 4 through the oil circuit 7 provided on the carburetor body 2. The oil circuit 7 is obtained by drilling a hole in the body. The carburetor body 1 is embedded with an electric heater 8 for heating the carburetor body 2, the oil circuit 7 and the air passage 1 to prevent frost on the body, the oil circuit and the air passage from affecting the atomization of the fuel. The electric heater 8 can be an electric heating rod, an electric heating wire, etc., preferably an electric heating rod.

[0033] The utility model embeds an electric heater 8 on the carburetor body for heating the carburetor body, the oil circuit and the air passage, that is, the carburetor body is heated to resist low temperature and frost, the oil circuit is heated to resist frost on the oil circuit and the fuel, and the air passage is heated to resist low temperature of the incoming air. That is, the utility model resists low temperature from three aspects, avoids frost on the body, the oil circuit and the air passage, and ensures the atomization effect of the fuel.

[0034] Specifically, the electric heating body 8 is a cylindrical electric heating rod (which can be a commercially available part), which is arranged near the air inlet end of the air passage 1, and the electric heating rod is close to the oil circuit 7 (that is, close to the side of the oil circuit), and the oil extraction port 5 is also close to the electric heating body 8. At the same time, a partial section of the electric heating rod extends into the air passage 1, that is, a partial length of the end of the electric heating rod extends into the air passage 1, and the preferred extension length is 1-5 cm.

[0035] A through hole 9 is provided on the wall of the carburetor body near the air inlet end of the air passage, and the through hole 9 penetrates into the air passage from outside the wall. The electric heating rod penetrates the through hole and the end extends into the air passage 1. The axis of the through hole is perpendicular to the axis of the air passage, and the axis of the through hole intersects or is close to the axis of the air passage. A first screw hole is provided on the carburetor body 2, and a first screw 10 is installed in the first screw hole. The end of the first screw abuts the electric heating rod to clamp and fix the electric heating rod, and is locked by the first screw 10 to achieve stable and reliable installation of the electric heating rod in the vibrating working environment of the carburetor body.

[0036] In order to facilitate temperature control, a temperature sensor 11 is provided on the carburetor body opposite the electric heating rod. The temperature sensor and the electric heating rod are electrically connected to the controller to control the power on and off of the electric heating rod by sensing the temperature of the temperature sensor. The control temperature of the carburetor body is between 10-40 degrees. The controller controls the operation of the electric heating rod according to the detection of the temperature sensor 11 by pre-setting the temperature control range. This is an existing technology and will not be repeated here.

[0037] In order to facilitate the installation of the temperature sensor 11, a rectangular groove 12 is provided on the carburetor body on the end face of the air inlet end of the air passage. The temperature sensor is arranged in the rectangular groove. A pressure piece 14 is inserted between the side face of the temperature sensor and the first inner side face 13 of the rectangular groove. The pressure piece has a first bent portion 15 bent 90 degrees toward the second inner side face of the rectangular groove at one end facing the air passage, and a second bent portion 16 bent 180 degrees in the opposite direction relative to the first bent portion at one end away from the air passage. The inner end of the first bent portion 15 is close to the front end of the temperature sensor, and the inner end of the second bent portion 16 is close to the outer wall of the carburetor body.

[0038] A second screw hole is provided on the above-mentioned carburetor body, and a second screw 17 is installed in the second screw hole. The end of the second screw abuts the side of the pressure plate to clamp and fix the temperature sensor. By providing the pressure plate 14, direct contact with the temperature sensor 11 is avoided when the second screw 17 is locked, causing damage to the temperature sensor 11 or test inaccuracy. In addition, the inner ends of the first bent portion 15 and the second bent portion 16 are provided on the pressure plate 14 to be close to the outer wall surface of the carburetor body, so that the movement position of the pressure plate 14 in the length direction is limited, and the temperature sensor 11 is avoided from falling into the air passage 1 after moving. Therefore, the provision of the pressure plate 14 is conducive to locking the temperature sensor 11 and avoiding damage to the temperature sensor 11, as well as avoiding the temperature sensor 11 from falling into the air passage 1 after moving, achieving three goals at one stroke.

[0039] In order to avoid a gap between the mounting end faces of the carburetor body and the intake pipe (not shown in the figure) when installing, the upper end faces of the pressing piece 14 and the temperature sensor 11 are lower than or flush with the intake end face of the air passage.

[0040] In addition, the present application may also have other embodiment structures, such as Figure 4-10As shown, the oil circuit 7 is provided with a needle valve A1 for opening and closing the oil circuit. The needle valve is installed in a needle valve chamber A2 located on the side of the carburetor body. The needle valve chamber A2 is connected to the fuel injection port 4. An elastic diaphragm A3 is provided in the needle valve chamber A2 for pushing the needle valve to open and close the oil circuit. A pressure cap A4 is provided on the needle valve chamber A2 and the elastic diaphragm A3. The pressure cap A4 presses the periphery of the elastic diaphragm to seal the needle valve chamber A2. In the prior art, after the engine is running, a negative pressure is generated in the air passage. This negative pressure attracts the elastic diaphragm through the fuel injection port, driving the needle valve to open and unblock the oil circuit. However, due to the slow engine startup speed at low temperatures, the negative pressure value is very low and is insufficient to drive the elastic diaphragm to drive the needle valve to operate.

[0041] Therefore, the present application provides a through hole A5 on the pressure cover A4, and an elastic press button A6 is passed through the through hole. The inner end of the elastic press button A6 is close to the elastic diaphragm A3. When the elastic press button is repeatedly pressed manually, the elastic diaphragm drives the needle valve to open the oil circuit, so that the oil pumped by the oil pump passes through the oil circuit and the needle valve cavity to the oil injection port and is sprayed into the air passage.

[0042] When the engine is in a low temperature environment (below -10 degrees Celsius), the engine rotates very slowly when it is started, and the negative pressure of the engine in the carburetor is not enough to push open the needle valve to achieve oil intake. The utility model installs an elastic push button on the gland, so that when the elastic push button is pressed repeatedly by hand, the elastic diaphragm drives the needle valve to open the oil circuit, so that the oil pumped by the oil pump can quickly pass through the oil circuit and the needle valve cavity to the oil injection port and be sprayed into the air passage, so as to be fully mixed with the air in the air passage, which is conducive to achieving rapid starting of the engine.

[0043] Specifically, the needle valve cavity A2 is a concave groove, the oil path 7 is connected to the bottom of the concave groove of the needle valve cavity, a pry plate A7 is installed on the needle valve, the middle part of the pry plate A7 is rotatably hinged in the concave groove of the needle valve cavity, the elastic diaphragm A3 is installed at the notch position of the concave groove of the needle valve cavity, the edge of the elastic diaphragm A3 is pressed tightly against the edge of the notch of the concave groove of the needle valve cavity by the pressure cover A4, and a pressure block A8 is fixedly installed in the middle position of the elastic diaphragm A3, the lower end of which is close to the first end of the pry plate A7. When the elastic press button is repeatedly pressed manually, the pressure block A8 is repeatedly pushed, and the needle valve A1 is pried up with the help of the pry plate A7 to make the oil path unblocked.

[0044] Specifically, the above-mentioned elastic press button A6 includes a cylindrical tube sleeve A9 passing through the through hole of the pressure cover, and the center of the cylindrical tube sleeve has a connecting channel A10 connecting the inside and outside of the pressure cover. The inner end of the cylindrical tube sleeve has an outward extension portion A11 to be limited on the inner end surface of the pressure cover, and the inner end of the cylindrical tube sleeve is close to the pressure block. The outer end of the cylindrical tube sleeve is provided with a limiting plate A12, and a retaining spring A13 is installed on the limiting plate. A compression spring A14 is installed between the limiting plate and the pressure cover, and the cylindrical tube sleeve A9 is restored by the compression spring A14.

[0045] The pry plate A7 is stamped from sheet metal. A channel formed by winding the sheet metal is defined at a position away from the first end of the pry plate. A hinge shaft A15 extends through the channel, the end of which is fixedly mounted to the carburetor body. A spring A16 is provided between the bottom of the concave groove of the needle valve chamber and the middle of the pry plate (the spring A16 is used to maintain the lower end of the needle valve blocking port A18 in the absence of external force). The second end of the pry plate has a fork opening A17, which is inserted into the upper end of the needle valve. The lower end of the needle valve blocks port A18, where the oil circuit connects to the needle valve chamber. When the elastic push button is pressed, the first end of the pry plate is pushed via the cylindrical sleeve and the pressure block, driving the second end of the pry plate and the lower end of the needle valve away from the oil circuit port, thereby establishing communication between the oil circuit and the needle valve chamber.

[0046] The pressure block A8 is provided with a threaded column A19, which passes through the middle of the elastic diaphragm and is locked and fixed at the other end by a nut A20 (in the shape of a circular thin sheet). A support sheet A21 is sleeved on the threaded column, and the support sheet abuts between the stepped surface of the pressure block and the elastic diaphragm. The support sheet A21 is a circular thin sheet with several through-holes, which can provide a larger support area.

[0047] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A carburetor that prevents low-temperature failure, characterized by: The invention comprises a carburetor body having an air passage, wherein the carburetor body is provided with an oil pump and an oil injection port for injecting oil into the air passage, the oil pump is provided with an oil extraction port for connecting to a fuel tank and a negative pressure port for communicating with a crank chamber of an engine, the oil outlet end of the oil pump is connected to the oil injection port through an oil passage provided on the carburetor body, and the carburetor body is embedded with an electric heater for heating the carburetor body, the oil passage and the air passage to prevent frost on the body, the oil passage and the air passage from affecting the atomization of the fuel.

2. The carburetor with low temperature failure protection according to claim 1, characterized in that: The electric heating body is a cylindrical electric heating rod, which is arranged near the air inlet end of the air passage and close to the oil circuit, while a partial section of the electric heating rod extends into the air passage.

3. The carburetor according to claim 2, characterized in that: A through hole is provided on the wall of the carburetor body near the air inlet end of the air passage, and the through hole penetrates into the air passage from outside the wall. The electric heating rod penetrates the through hole and the end extends into the air passage. The axis of the through hole is perpendicular to the axis of the air passage, and the axis of the through hole intersects or is close to the axis of the air passage. A first screw hole is provided on the carburetor body, and a first screw is installed in the first screw hole. The end of the first screw abuts the electric heating rod to clamp and fix the electric heating rod.

4. The carburetor according to claim 2 or 3, characterized in that: A temperature sensor is provided on the carburetor body at a position opposite to the electric heating rod. The temperature sensor and the electric heating rod are both electrically connected to the controller to control the on and off of the electric heating rod through the sensed temperature of the temperature sensor.

5. The carburetor with low temperature failure protection according to claim 1, characterized in that: The oil delivery pump is a diaphragm pump.

6. The carburetor with low temperature failure protection according to claim 4, characterized in that: A rectangular groove is provided on the carburetor body on the end face of the air inlet end of the air passage, and a temperature sensor is provided in the rectangular groove. A pressure piece is inserted between the side face of the temperature sensor and the first inner side face of the rectangular groove. The pressure piece has a first bent portion that is bent 90 degrees toward the second inner side face of the rectangular groove at one end facing the air passage, and a second bent portion that is bent 180 degrees in the opposite direction to the first bent portion at one end away from the air passage. The inner end of the first bent portion is close to the front end of the temperature sensor, and the inner end of the second bent portion is close to the outer wall surface of the carburetor body.

7. The carburetor according to claim 6, characterized in that: A second screw hole is provided on the carburetor body, a second screw is installed in the second screw hole, and the end of the second screw abuts against the side surface of the pressure plate to clamp and fix the temperature sensor.

8. The carburetor with low temperature failure protection according to claim 7, characterized in that: The upper end surfaces of the pressing plate and the temperature sensor are lower than or flush with the intake end surface of the air passage, so as to avoid a gap between the mounting end surfaces when the carburetor body and the intake pipe are mounted.

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