Carburetor capable of preventing low-temperature failure and control method thereof

Abstract

The invention provides a carburetor capable of preventing low-temperature failure and a control method thereof. The carburetor comprises a carburetor body with a gas passing channel, a constant-temperature control assembly and a rapid oil pumping assembly. The 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 connecting and disconnecting the oil way, the needle valve is installed in a needle valve cavity located on the side portion of the carburetor body, a crow plate is installed on the needle valve, the needle valve cavity is communicated with the oil spraying opening, and an elastic membrane used for pushing the needle valve to connect and disconnect the oil way through the crow plate is arranged in the needle valve cavity. A gland covers the needle valve cavity and the elastic membrane; the constant-temperature control assembly comprises a controller, an electric heating body and a temperature sensor, wherein the electric heating body and the temperature sensor are arranged on the carburetor body. The rapid oil pumping assembly comprises an elastic pressing button arranged in a through hole in the gland in a penetrating mode. The starting speed of the engine in the low-temperature environment can be increased, and the fuel atomization effect of the carburetor in the low-temperature environment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of carburetors, in particular to a carburetors capable of preventing low temperature failure and a control method thereof. Background Art

[0002] A carburetor is a mechanical device that mixes a certain proportion of gasoline and air under the vacuum created by the engine. As a sophisticated mechanical device, the carburetor uses the kinetic energy of the inhaled air flow to atomize gasoline. Its important role in the engine can be called the "heart" of the engine.

[0003] At present, engines with carburetors can ensure normal operation under normal temperature conditions. However, with the continuous expansion of the application scenarios of such engines, when engines with carburetors are used in drones operating at high altitudes in severe cold environments, the low temperature will cause the engine with carburetors to start slowly, making it difficult for the drone to take off. Even if the drone takes off smoothly, the temperature will gradually decrease as the altitude increases. Frost on the surface of the carburetors in high-altitude environments will affect the atomization effect of the fuel, resulting in the engine fuel being unable to fully work, and even the engine stalling, which will cause the drone to crash.

[0004] At present, a Chinese patent has been retrieved for a new type of carburetor internal sealing and filtering device - CN220539741U, which includes a carburetor body and a carburetor lower body, wherein the carburetor body is located above the carburetor lower body, a pump cover gasket is arranged below the carburetor body, and the pump cover gasket is located between the carburetor body and the carburetor lower body, and an oil pump diaphragm is arranged below the carburetor body, and the oil pump diaphragm is located between the carburetor body and the carburetor lower body. The patent changes the raised sealing line at the bottom of the carburetor body into a groove, so that the bumps here are greatly reduced during the production process, and a raised sealing line is made separately on the original sealing gasket, so that it just matches the groove on the body, so that it will be tightly sealed after being pressed, and the sealing gasket is made of rubber material and molded, so there is no bump problem, which reduces the oil leakage of the equipment and reduces the production cost of the equipment; but the patent cannot avoid the problem of slow starting of the carburetor due to low temperature and the inability to atomize the oil normally.

[0005] In view of this, the present invention proposes a carburetor that prevents low-temperature failure and a control method thereof to solve the above-mentioned problem. Summary of the invention

[0006] The purpose of the present invention is to provide a carburetor that prevents low-temperature failure and a control method thereof, to accelerate the starting speed of an engine in a low-temperature environment, and to improve the atomization effect of carburetor fuel in a low-temperature environment.

[0007] To achieve the above-mentioned object, in a first aspect, the present invention provides a carburetor that prevents low-temperature failure, characterized in that it comprises a carburetor body having an air passage, a constant temperature control component and a fast oil pump component;

[0008] The carburetor body is provided with an oil delivery pump and an oil injection port for injecting oil into the gas passage; the oil delivery pump is provided with an oil extraction port for connecting to the oil tank and a negative pressure port for communicating with the engine crank chamber, and the oil outlet end of the oil delivery pump is connected to the oil injection port through an oil circuit provided on the carburetor body; the oil circuit is provided with a needle valve for opening and closing the oil circuit, the needle valve is installed in a needle valve cavity located at the side of the carburetor body, and a pry plate is installed on the needle valve, the needle valve cavity is communicated with the oil injection port, an elastic diaphragm for pushing the needle valve to open and close the oil circuit with the aid of the pry plate is provided in the needle valve cavity, the needle valve cavity and the elastic diaphragm are covered with a pressure cover, and the pressure cover is pressed on the periphery of the elastic diaphragm to seal the needle valve cavity;

[0009] The constant temperature control assembly includes a controller, an electric heater and a temperature sensor arranged on the carburetor body; the controller is electrically connected to the electric heater and the temperature sensor respectively, and the controller controls the start and stop of the electric heater according to a preset target temperature range and the temperature collected in real time by the temperature sensor, so as to achieve constant temperature control of the working temperature of the carburetor;

[0010] The fast oil pump assembly includes an elastic push button passing through a through hole on the gland, and the inner end of the elastic push button is close to the elastic diaphragm, so that when the elastic push button is manually pressed, the elastic diaphragm drives the needle valve to open the oil circuit, so that the oil pumped by the oil delivery pump passes through the oil circuit and the needle valve cavity to the oil injection port and is sprayed into the air passage.

[0011] Preferably, the electric heating body is a cylindrical electric heating rod, which is arranged on the carburetor body near the air inlet end of the air passage, and the electric heating rod is close to the oil circuit, and a partial section of the electric heating rod extends into the air passage; the temperature sensor is arranged on the carburetor body at a position directly opposite the electric heating rod.

[0012] Preferably, a through hole is provided on the wall of the carburetor body near the air inlet end of the air passage, the through hole penetrates from the outside of the wall into the air passage, the electric heating rod penetrates the through hole and the end extends into the air passage, the axis line of the through hole is perpendicular to the axis line of the air passage, and the axis line of the through hole intersects or is close to the axis line of the air passage, a first screw hole is provided on the carburetor body, 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.

[0013] Preferably, a rectangular groove 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, 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 to the first bent portion at one end away from the air passage, the inner end of the first bent portion abuts against the front end of the temperature sensor, and the inner end of the second bent portion abuts against the outer wall of the carburetor body; the upper end faces of the pressure plate and the temperature sensor are lower than or flush with the end face of the air inlet end of the air passage, so as to avoid a gap between the mounting end faces when the carburetor body and the air intake pipe are installed.

[0014] 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.

[0015] Preferably, the needle valve cavity is a concave groove, the oil circuit is connected to the bottom of the concave groove of the needle valve cavity, the middle part of the pry plate is rotatably hinged in the concave groove of the needle valve cavity, the elastic diaphragm is installed at the notch position of the concave groove of the needle valve cavity, the edge of the elastic diaphragm is pressed tightly against the edge of the notch of the concave groove of the needle valve cavity by the pressure cover, and a pressure block with a lower end close to the first end of the pry plate is fixedly installed in the middle position of the elastic diaphragm, so as to push the pressure block when the elastic pressing button is manually pressed, and the needle valve is pried up with the help of the pry plate to open the oil circuit.

[0016] Preferably, the elastic push button includes a cylindrical tube sleeve passing through the through hole of the pressure cover, the center of the cylindrical tube sleeve has a connecting channel connecting the inside and outside of the pressure cover, the inner end of the cylindrical tube sleeve has an outward extension portion 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, the limiting plate is installed with a retaining spring, a compression spring is installed between the limiting plate and the pressure cover, and the return of the cylindrical tube sleeve is achieved by the compression spring.

[0017] Preferably, the position of the pry plate away from the first end has a channel formed by winding a plate sheet, a hinge shaft is arranged in the channel, the end of the hinge shaft is fixedly mounted on the carburetor body in the concave groove of the needle valve cavity, a spring is arranged between the bottom of the concave groove of the needle valve cavity 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, and the lower end of the needle valve is blocked in the port where the oil circuit and the needle valve cavity are connected.

[0018] Preferably, a threaded column is provided on the pressing block, the threaded column passes through the middle of the elastic diaphragm and is locked and fixed at the other end by a nut, and a support plate is also sleeved on the threaded column. The support plate is a circular thin plate with a plurality of through circular holes, and the support plate abuts between the stepped surface of the pressing block and the elastic diaphragm.

[0019] In a second aspect, the present invention provides a control method for the above-mentioned carburetor that prevents low-temperature failure, which specifically includes the following steps:

[0020] S1, preset the upper limit and lower limit of the target temperature range through the controller;

[0021] S2. The controller compares the temperature collected by the temperature sensor in real time with the upper and lower limits of the target temperature range; when the temperature collected by the temperature sensor in real time is lower than the lower limit of the target temperature range, the electric heater is controlled to start heating; when the temperature collected by the temperature sensor in real time is higher than the upper limit of the target temperature range, the electric heater is controlled to stop heating.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention embeds an electric heater for heating the carburetor body, the oil circuit and the air passage on 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, the low temperature is resisted from three aspects, the frost on the body, the oil circuit and the air passage is avoided, and the atomization effect of the fuel is ensured; in addition, the present invention installs an elastic push button on the pressure cover, so that when the elastic push button is manually pressed, 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 fuel 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 realizing the rapid start of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of a carburetor for preventing low-temperature failure according to the present invention from one perspective;

[0025] Figure 2 It is a three-dimensional structural schematic diagram of another perspective of the carburetor for preventing low temperature failure of the present invention;

[0026] Figure 3 yes Figure 2 A partial exploded view of

[0027] Figure 4 It is a cross-sectional view of the center line of the oil passage of the carburetor for preventing low temperature failure of the present invention;

[0028] Figure 5 yes Figure 4 A partial view of

[0029] Figure 6 It is an exploded view of the elastic push button and other parts;

[0030] Figure 7 , Figure 8 yes Figure 6 A partial view of the . DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-8 , the technical solution of the present invention is specifically described.

[0032] The present invention provides a carburetor that prevents low-temperature failure, comprising a carburetor body 2 having an air passage 1, a constant temperature control component and a fast oil pump component; the air passage 1 is used for the introduction of air.

[0033] The carburetor body 2 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 the existing technology and the specific structure is not described in detail) and an oil injection port 4 for spraying oil into the air passage (the oil sprayed into the oil injection port 4 is mixed with air to form an atomization); 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. With the reciprocating action of the piston in the engine crank chamber, the reciprocating opening and closing of the diaphragm switch in the oil pump 3 is realized by the repeated changes in the negative pressure value, so that the oil is sucked in from the oil extraction port 5 and output from the oil outlet end of the oil pump 3.

[0034] The oil outlet end of the oil delivery pump 3 is connected to the oil injection port 4 through the oil circuit 7 provided on the carburetor body 2, and the oil circuit 7 is obtained by drilling a hole in the body; a needle valve A1 for opening and closing the oil circuit 7 is provided on the oil circuit 7, and the needle valve A1 is installed in a needle valve cavity A2 located on the side of the carburetor body 2, and a pry plate A7 is installed on the needle valve A1, the needle valve cavity A2 is communicated with the oil injection port 4, and an elastic diaphragm A3 for pushing the needle valve A1 to open and close the oil circuit 7 with the help of the pry plate A7 is provided in the needle valve cavity A2, and a pressure cover A4 is provided on the needle valve cavity A2 and the elastic diaphragm A3, and the pressure cover A4 presses the periphery of the elastic diaphragm A3 to seal the needle valve cavity A2.

[0035] The constant temperature control component includes a controller and an electric heater 8 and a temperature sensor 11 arranged on the carburetor body 2; the controller is electrically connected to the electric heater 8 and the temperature sensor 11 respectively, and the controller controls the start and stop of the electric heater 8 according to a preset target temperature range and the temperature collected in real time by the temperature sensor, so as to achieve constant temperature control of the working temperature of the carburetor.

[0036] The electric heater 8 provided on the carburetor body 2 is used to heat the carburetor body 2, the oil circuit 7 and the air passage 1, that is, the carburetor body 2 is heated to achieve low temperature resistance and anti-frost of the carburetor body 2, the oil circuit 7 is heated to achieve anti-frost of the oil circuit and the oil, and the air passage 1 is heated to resist the low temperature of the incoming air. Low temperature resistance is achieved from three aspects, frosting of the body, the oil circuit and the air passage is avoided, and the atomization effect of the fuel is guaranteed.

[0037] The fast oil pump assembly includes an elastic push button A6 that passes through a through hole A5 on a gland A4, and the inner end of the elastic push button A6 is close to the elastic diaphragm A3, so that when the elastic push button A6 is manually pressed, the elastic diaphragm A3 drives the needle valve A1 to open the oil path 7, so that the oil pumped by the oil pump 3 passes through the oil path 7 and the needle valve chamber A2 to the oil injection port 4 and is sprayed into the air passage 1.

[0038] Under normal temperature conditions, after the engine is working, there is negative pressure in the air passage, and the negative pressure drives the needle valve to open the blockage of the oil passage through the oil injection port adsorbing the elastic diaphragm. When the engine is in a low temperature environment (below minus 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 present invention installs an elastic pressing button A6 on the gland A4, so that when the elastic pressing button A6 is manually pressed, the elastic diaphragm A3 drives the needle valve A1 to open the oil passage 7, so that the oil pumped by the oil pump 3 can quickly pass through the oil passage 7 and the needle valve cavity A2 to the oil injection port 4 and spray into the air passage 1, so as to be fully mixed with the air in the air passage 1, which is conducive to the rapid start of the engine.

[0039] In this embodiment, the electric heating body 8 is a cylindrical electric heating rod, which is arranged at the air inlet end of the carburetor body 2 close to the air passage 1, and the electric heating rod is close to the oil passage 7, and 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 a preferred extension length is 1-5 cm. The temperature sensor is arranged at a position on the carburetor body directly opposite to the electric heating rod.

[0040] In this embodiment, a through hole 9 is formed on the wall of the carburetor body near the air inlet end of the air passage, and the through hole 9 penetrates from the wall into the air passage 1, and the electric heating rod penetrates the through hole 9 and the end thereof extends into the air passage 1, and the axis of the through hole 9 is perpendicular to the axis of the air passage 1, and the axis of the through hole 9 intersects or approaches the axis of the air passage 1, and a first screw hole is formed on the carburetor body 2, and a first screw 10 is installed in the first screw hole, and the end of the first screw 10 abuts against the electric heating rod to clamp and fix the electric heating rod. By locking the first screw 10, the electric heating rod can be stably and reliably installed in the vibrating working environment of the carburetor body 2.

[0041] In this embodiment, a rectangular groove 12 is provided on the carburetor body 2 on the air inlet end face of the air passage 1, and a temperature sensor 11 is arranged in the rectangular groove 12. A pressing piece 14 is inserted between the side face of the temperature sensor 11 and the first inner side face 13 of the rectangular groove 12. The pressing piece 14 has a first bending portion 15 bent 90 degrees toward the second inner side face of the rectangular groove 12 at one end facing the air passage 1, and a second bending portion 16 bent 180 degrees in the opposite direction relative to the first bending portion 15 at one end away from the air passage 1. The inner end of the first bending portion 15 is close to the front end of the temperature sensor 11, and the inner end of the second bending portion 16 is close to the outer wall of the carburetor body 2. The upper end faces of the pressing piece and the temperature sensor are lower than or flush with the air inlet end face of the air passage to avoid a gap between the mounting end faces when the carburetor body and the air intake pipe are installed.

[0042] In this embodiment, a second screw hole is provided on the carburetor body 2, and a second screw 17 is installed in the second screw hole. The end of the second screw 17 abuts against the side of the pressure plate 14 to clamp and fix the temperature sensor 11. By providing the pressure plate 14, the second screw 17 is prevented from directly contacting the temperature sensor 11 when being locked, thereby preventing the temperature sensor 11 from being damaged or the test being inaccurate. In addition, the pressure plate 14 is provided with the inner ends of the first bending portion 15 and the second bending portion 16 close to the outer wall surface of the carburetor body 2, thereby limiting the movement position of the pressure plate 14 in the length direction, and preventing the temperature sensor 11 from falling into the air passage 1 after the movement. Therefore, the provision of the pressure plate 14 is conducive to achieving the locking of the temperature sensor 11 and preventing the temperature sensor 11 from being damaged, and preventing the temperature sensor 11 from falling into the air passage 1 after the movement, thereby achieving three effects at one stroke.

[0043] In this embodiment, 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, the middle part of the pry plate A7 is rotatably hinged in the concave groove of the needle valve cavity A2, the elastic diaphragm A3 is installed at the notch position of the concave groove of the needle valve cavity A2, 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 A2 by the pressure cover A4, and a pressure block A8 is fixedly installed in the middle position of the elastic diaphragm A3, whose lower end is close to the first end of the pry plate A7, so as to push the pressure block A8 when the elastic pressing button is manually pressed, and the needle valve A1 is pried up with the help of the pry plate A7 to make the oil path unblocked.

[0044] In this embodiment, the elastic push button A6 includes a cylindrical tube sleeve A9 that passes through the through hole A5 of the pressure cover A4, and the center of the cylindrical tube sleeve A9 has a connecting channel A10 that connects the inside and outside of the pressure cover A4. The inner end of the cylindrical tube sleeve A9 has an outward extension portion A11 to be limited on the inner end surface of the pressure cover A4, and the inner end of the cylindrical tube sleeve A9 is close to the pressure block A8. The outer end of the cylindrical tube sleeve A9 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 A12 and the pressure cover A4, and the recovery of the cylindrical tube sleeve A9 is achieved by the compression spring A14.

[0045] In this embodiment, the pry plate A7 is formed by stamping a plate sheet, and the position of the pry plate A7 away from the first end has a channel formed by winding a plate sheet, and a hinge shaft A15 is arranged in the channel, and the end of the hinge shaft A15 is fixedly installed on the carburetor body 2 in the concave groove of the needle valve chamber A2, and a spring A16 is arranged between the bottom of the concave groove of the needle valve chamber A2 and the middle position of the pry plate A7 (the function of the spring A16 is to keep the lower end of the needle valve A1 blocking the port A18 in the absence of external force), and the second end of the pry plate A7 has a fork A17, and the fork A17 is inserted into the upper end of the needle valve A1, and the lower end of the needle valve A1 is blocked in the port A18 where the oil circuit 7 and the needle valve chamber A2 are connected. When the elastic pressing button A6 is pressed, the first end of the pry plate A7 is pushed through the cylindrical sleeve A9 and the pressing block A8, driving the second end of the pry plate A7 and the lower end of the needle valve A1 away from the port of the oil circuit 7, thereby achieving communication between the oil circuit 7 and the needle valve chamber A2.

[0046] In this embodiment, a threaded column A19 is provided on the pressing block A8, and the threaded column A19 passes through the middle part of the elastic diaphragm A3 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 also sleeved on the threaded column. The support sheet A21 is a circular thin sheet and has a plurality of through circular holes thereon. The support sheet A21 abuts between the stepped surface of the pressing block A8 and the elastic diaphragm A3, and a larger support area can be provided through the support sheet A21.

[0047] The present invention also provides a control method for the above-mentioned carburetor that prevents low-temperature failure, which specifically includes the following steps:

[0048] S1, preset the upper limit and lower limit of the target temperature range through the controller;

[0049] S2. The controller compares the temperature collected by the temperature sensor in real time with the upper limit and lower limit of the target temperature range; when the temperature collected by the temperature sensor in real time is lower than the lower limit of the target temperature range, the electric heating body 8 is controlled to start heating; when the temperature collected by the temperature sensor in real time is higher than the upper limit of the target temperature range, the electric heating body 8 is controlled to stop heating.

[0050] The above are preferred embodiments of the present invention. Any changes made according to the technical solution of the present invention, as long as the resulting functions do not exceed the scope of the technical solution of the present invention, belong to the protection scope of the present invention.

Claims

1. A carburetor that prevents low temperature failure, characterized in that: The invention comprises a carburetor body having an air passage, a thermostatic control assembly and a fast oil pump assembly; The carburetor body is provided with an oil delivery pump and an oil injection port for injecting oil into the gas passage; the oil delivery pump is provided with an oil extraction port for connecting to the oil tank and a negative pressure port for communicating with the engine crank chamber, and the oil outlet end of the oil delivery pump is connected to the oil injection port through an oil circuit provided on the carburetor body; the oil circuit is provided with a needle valve for opening and closing the oil circuit, the needle valve is installed in a needle valve cavity located at the side of the carburetor body, and a pry plate is installed on the needle valve, the needle valve cavity is communicated with the oil injection port, an elastic diaphragm for pushing the needle valve to open and close the oil circuit with the aid of the pry plate is provided in the needle valve cavity, the needle valve cavity and the elastic diaphragm are covered with a pressure cover, and the pressure cover is pressed on the periphery of the elastic diaphragm to seal the needle valve cavity; The constant temperature control assembly includes a controller, an electric heater and a temperature sensor arranged on the carburetor body; the controller is electrically connected to the electric heater and the temperature sensor respectively, and the controller controls the start and stop of the electric heater according to a preset target temperature range and the temperature collected in real time by the temperature sensor, so as to achieve constant temperature control of the working temperature of the carburetor; The fast oil pump assembly includes an elastic push button passing through a through hole on the gland, and the inner end of the elastic push button is close to the elastic diaphragm, so that when the elastic push button is manually pressed, the elastic diaphragm drives the needle valve to open the oil circuit, so that the oil pumped by the oil delivery pump passes through the oil circuit and the needle valve cavity to the oil injection port and is sprayed into the air passage.

2. The carburetor for preventing low temperature failure according to claim 1, characterized in that: The electric heating body is a cylindrical electric heating rod, which is arranged on the carburetor body near the air inlet end of the air passage, and the electric heating rod is close to the oil circuit, and a partial section of the electric heating rod extends into the air passage; the temperature sensor is arranged on the carburetor body at a position directly opposite the electric heating rod.

3. The carburetor for preventing low temperature failure according to claim 2, characterized in that: A through hole is formed 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 into the through hole and the end thereof extends into the air passage. The axis line of the through hole is perpendicular to the axis line of the air passage, and the axis line of the through hole intersects or is close to the axis line of the air passage. A first screw hole is formed on the carburetor body, and a first screw is installed in the first screw hole. The end of the first screw abuts against the electric heating rod to clamp and fix the electric heating rod.

4. The carburetor for preventing low temperature failure according to claim 2, characterized in that: A rectangular groove is provided on the carburetor body on the air inlet end face of the air passage, a temperature sensor is arranged 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 at one end facing the air passage, bent 90 degrees toward the second inner side face of the rectangular groove, the pressure piece has a second bent portion at one end away from the air passage, bent 180 degrees in the opposite direction to the first bent portion, the inner end of the first bent portion abuts against the front end of the temperature sensor, and the inner end of the second bent portion abuts against the outer wall of the carburetor body; the upper end faces of the pressure piece and the temperature sensor are lower than or flush with the air inlet end face of the air passage, so as to avoid a gap between the mounting end faces when the carburetor body and the air inlet pipe are installed.

5. The carburetor for preventing low temperature failure according to claim 4, 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.

6. The carburetor for preventing low temperature failure according to claim 1, characterized in that: The needle valve cavity is a concave groove, the oil path 7 is communicated with the groove bottom of the concave groove of the needle valve cavity, the middle part of the pry plate is rotatably hinged in the concave groove of the needle valve cavity, the elastic diaphragm is installed at the notch position of the concave groove of the needle valve cavity, the edge of the elastic diaphragm is pressed tightly against the edge of the notch of the concave groove of the needle valve cavity by the pressure cover, and a pressure block with a lower end close to the first end of the pry plate is fixedly installed in the middle position of the elastic diaphragm, which is used to push the pressure block when the elastic pressing button is manually pressed, and the needle valve is pried up with the help of the pry plate to open the oil path.

7. The carburetor for preventing low temperature failure according to claim 6, characterized in that: The elastic push button includes a cylindrical tube sleeve passing through the through hole of the pressure cover, the center of the cylindrical tube sleeve has a connecting channel connecting the inside and outside of the pressure cover, the inner end of the cylindrical tube sleeve has an outward extension portion 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, the limiting plate is installed with a retaining spring, a compression spring is installed between the limiting plate and the pressure cover, and the return of the cylindrical tube sleeve is achieved by the compression spring.

8. The carburetor for preventing low temperature failure according to claim 6, characterized in that: The position of the pry plate away from the first end has a channel formed by winding a plate sheet, a hinge shaft is arranged in the channel, and the end of the hinge shaft is fixedly mounted on the carburetor body in the concave groove of the needle valve cavity, a spring is arranged between the bottom of the concave groove of the needle valve cavity and the middle position of the pry plate, and the second end of the pry plate has a fork, the fork is inserted into the upper end of the needle valve, and the lower end of the needle valve is blocked in the port where the oil circuit and the needle valve cavity are connected.

9. The carburetor for preventing low temperature failure according to claim 6, characterized in that: A threaded column is provided on the pressing block, which passes through the middle of the elastic diaphragm and is locked and fixed at the other end by a nut. A support sheet is also sleeved on the threaded column. The support sheet is a circular thin sheet with a plurality of through circular holes thereon, and the support sheet abuts between the stepped surface of the pressing block and the elastic diaphragm.

10. The control method for a carburetor to prevent low temperature failure according to any one of claims 1 to 9, characterized in that: The specific steps include: S1, preset the upper limit and lower limit of the target temperature range through the controller; S2. The controller compares the temperature collected by the temperature sensor in real time with the upper and lower limits of the target temperature range; when the temperature collected by the temperature sensor in real time is lower than the lower limit of the target temperature range, the electric heater is controlled to start heating; when the temperature collected by the temperature sensor in real time is higher than the upper limit of the target temperature range, the electric heater is controlled to stop heating.

Images