Fuel air heater

Abstract

The present invention provides a fuel oil heater, which belongs to the technical field of machinery. It solves the problem that the existing fuel oil heater has inaccurate fuel supply, resulting in unsatisfactory combustion effect. This fuel oil heater includes a fuel tank and an outer cover fixedly connected to the fuel tank. A combustion cylinder is fixedly connected inside the outer cover. A heat sink is fixedly connected to the front end of the combustion cylinder. The inner end of the combustion cylinder has an oil and gas inlet, and an oil injector, an ignition needle and a blower are provided at the oil and gas inlet. An electronic fuel injection pump and a return oil solenoid valve are provided in the fuel tank. The oil inlet end of the return oil solenoid valve is connected to the oil outlet end of the electronic fuel injection pump through a first oil pipe. The oil outlet end of the return oil solenoid valve can be connected to the oil injector through a second oil pipe. The oil return end of the return oil solenoid valve is connected to the fuel tank, and when the electronic fuel injection pump stops supplying oil to the oil injector, the oil return end of the return oil solenoid valve is in an open state. The fuel supply pipeline of this fuel oil heater has the advantages of having a reflux function, accurate fuel supply and reliable operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of machinery, and relates to a warm air blower, in particular to a fuel warm air blower. Background Art

[0002] The energy-saving and environment-friendly fuel warm air blower uses diesel or kerosene as fuel and generates heat by burning diesel or kerosene. The existing energy-saving and environment-friendly fuel warm air blower pumps the fuel in the fuel tank into the combustion cylinder of the energy-saving and environment-friendly fuel warm air blower through a gear pump for combustion. However, the fuel warm air blower in the prior art uses a gear pump to transport fuel, and the atomized particles of the fuel are large, and there is less oxygen supply during combustion, so incomplete combustion will occur. In addition, the heat output effect of the existing fuel warm air blower is not very good, and large heat loss is likely to occur.

[0003] For example, a fuel warm air blower (application number: 201721446144.5) disclosed in Chinese patent literature includes a fuel tank. A combustion barrel is provided at the front part of the upper end of the fuel tank. A combustion head assembly is connected to the rear end of the combustion barrel. An air outlet assembly is provided at the front end of the combustion barrel. A cooling device is connected to the rear part of the upper end of the fuel tank. A control device is provided on one side of the fuel tank. The combustion head assembly includes a fixed disk. A flame stabilizing disk is connected to the rear end of the fixed disk. A fuel nozzle is provided in the middle of the flame stabilizing disk. Air guiding vanes are provided in the flame stabilizing disk. A spark plug is cooperatively provided on one side of the flame stabilizing disk. A wind wheel motor is connected to the rear end of the flame stabilizing disk. The output end of the wind wheel motor is connected to the air guiding vanes. The fuel nozzle is connected to an oil suction assembly on the fuel tank. An insulating barrel is provided outside the combustion barrel. The oil suction assembly includes an oil suction pipe and an oil suction sealing ring with one end connected to the fuel tank. The other end of the oil suction pipe is connected to the fuel nozzle. An electromagnetic pump bracket is provided on the oil suction pipe. An electromagnetic pump and a filter are connected to the electromagnetic pump bracket. However, there is no oil return structure between the electromagnetic pump and the oil suction pipe of this fuel warm air blower. Therefore, after the fuel warm air blower is turned off and the electromagnetic pump and the wind wheel motor stop working, the fuel remaining in the oil suction pipe enters the combustion barrel for incomplete combustion and emits black smoke. Therefore, its oil supply is not accurate enough and the combustion effect is not ideal. Summary of the Invention

[0004] The purpose of the present invention is to provide a fuel warm air blower with a reflux function in the oil supply pipeline, accurate oil supply and reliable operation in view of the above problems existing in the prior art.

[0005] The object of the present invention can be achieved by the following technical solutions: a fuel oil heater, comprising a fuel tank and an outer cover fixedly connected to the fuel tank. A combustion cylinder is fixedly connected inside the outer cover. A heat sink is fixedly connected to the front end of the combustion cylinder. The inner end of the combustion cylinder has an oil and gas inlet, and an oil injector, an ignition needle and a blower are provided at the oil and gas inlet. The air outlet of the blower and the oil injection port of the oil injector both face the oil and gas inlet. It is characterized in that an electronic fuel injection pump and a return oil solenoid valve are provided in the fuel tank. The return oil solenoid valve has an oil inlet end, an oil outlet end and a return oil end. The oil inlet end of the return oil solenoid valve is connected to the oil outlet end of the electronic fuel injection pump through a first oil pipe. The oil outlet end of the return oil solenoid valve can be connected to the oil injector through a second oil pipe. The return oil end of the return oil solenoid valve is connected to the fuel tank, and when the electronic fuel injection pump stops supplying oil to the oil injector, the return oil end of the return oil solenoid valve is in an open state.

[0006] During operation, the electronic fuel injection pump is started to deliver fuel to the return oil solenoid valve and supply oil to the oil injector through the second oil pipe. The oil injector sprays fuel into the combustion cylinder, and at the same time the blower blows air into the combustion cylinder. Through the ignition needle, the fuel and air burn in the combustion cylinder. When it is necessary to stop working, the electronic fuel injection pump stops supplying oil. At this time, the return oil end of the return oil solenoid valve is in an open state, and the fuel in the above oil pipes returns to the fuel tank through the return oil end of the return oil solenoid valve, avoiding the excess fuel in the oil pipes from entering the combustion cylinder and then causing incomplete combustion and black smoke. It has the advantages of accurate fuel supply and reliable operation. The electronic fuel injection pump is an electronic fuel injection pump (application number: 2016205411033), and the electronic fuel injection pump is a motorcycle electronic fuel injection pump (application number: 2017213235396). Using the electronic fuel injection pump has the advantages of higher fuel supply accuracy and lower cost.

[0007] In the above fuel oil heater, the fuel oil heater includes a control circuit board, and the electronic fuel injection pump and the return oil solenoid valve are both connected to the control circuit board. By controlling the return oil solenoid valve and the electronic fuel injection pump through the control circuit board, it has the advantages of convenient control and relatively accurate control.

[0008] In the above fuel oil heater, a cylindrical front cover of the oil injector is coaxially fixedly connected at the oil and gas inlet. The front cover of the oil injector penetrates through in the front and back directions. The blower is located outside the front cover of the oil injector, and the air outlet of the blower faces the inside of the front cover of the oil injector. By providing the front cover of the oil injector, the blower sends air into the combustion cylinder through the front cover of the oil injector, which has the advantages of better air supply effect and relatively simple structure.

[0009] In the above-mentioned fuel oil heater, a cylindrical fuel injector seat is fixedly connected between the front cover of the fuel injector and the blower. The fuel injector is fixedly connected to the middle of the fuel injector seat and is coaxially arranged with the combustion cylinder, and the fuel injection port of the fuel injector faces the front cover of the fuel injector. The fuel injector is fixedly connected to the middle of the fuel injector seat and is coaxially arranged with the combustion cylinder, enabling the fuel injector to evenly inject fuel into the combustion cylinder, thereby improving the combustion efficiency.

[0010] In the above-mentioned fuel oil heater, a guide vane impeller is provided at the inner end of the fuel injector. Through the above-mentioned guide vane impeller, the air sent by the blower is guided towards the inner side wall of the front cover of the fuel injector, having a good air guiding effect.

[0011] In the above-mentioned fuel oil heater, the inner end of the front cover of the fuel injector has a coaxially arranged and conical barrel-shaped air guiding part. The outer side wall of the air guiding part is annularly provided with through air guiding holes, and the air guiding holes guide the inner side wall of the combustion cylinder. The air flowing through the front cover of the fuel injector is guided to the inner side wall of the combustion cylinder through the air guiding holes, enabling the air and oil mist in the combustion cylinder to be better mixed, thereby improving the combustion efficiency.

[0012] In the above-mentioned fuel oil heater, a heat insulation fiber layer is provided on the outer side wall of the combustion cylinder and the heat insulation fiber layer is located inside the outer cover. The heat insulation fiber layer is provided on the outer side wall of the combustion cylinder, having a good heat insulation effect, avoiding the over-high temperature of the outer cover, and improving the use safety.

[0013] In the above-mentioned fuel oil heater, a cooling cavity is formed between the outer side wall of the heat insulation fiber layer and the inner side wall of the outer cover. A cooling fan is provided inside the outer cover. The cooling fan is located below the combustion cylinder and the air outlet of the cooling fan faces upwards and blows towards the cooling cavity. The cooling fan blows towards the cooling cavity to cool down the combustion cylinder and the outer cover, having the advantages of use safety and improved service life.

[0014] In the above-mentioned fuel oil heater, a protective net is fixedly connected to the outer end of the outer cover, and the protective net covers the outside of the radiator fins. The outside of the radiator fins is covered with a protective net to prevent scalding, having the advantage of relatively safe use.

[0015] In the above-mentioned fuel oil heater, a temperature sensor is provided on the outer cover, and the temperature sensor is connected to the control circuit board. When the temperature sensor on the outer cover senses that the temperature exceeds the set temperature, the temperature sensor sends a signal to the control circuit board, and the control circuit board controls the electric fuel injection pump to stop working, which can avoid the over-high temperature of the outer cover and improve the use safety.

[0016] In the above fuel oil heater, a vibration sensor is provided on the fuel tank, and the vibration sensor is connected to the control circuit board. When the vibration value sensed by the vibration sensor reaches the set value, the control circuit board controls the electronic fuel injection pump to stop working, thereby improving the use safety.

[0017] In the above fuel oil heater, a photosensitive sensor is provided inside the outer cover, and the photosensitive sensor is connected to the control circuit board. The photosensitive sensor can sense the light inside the combustion cylinder. When the fuel oil heater is turned on, the control circuit board controls the high-voltage package connected to the ignition pin to work to make the ignition pin ignite; after the fuel oil heater works normally, the fuel burns in the combustion cylinder. When the photosensitive sensor detects that there is a flame in the combustion cylinder, the control circuit board controls the high-voltage package to make the ignition pin stop igniting; when the photosensitive sensor detects that there is no flame in the combustion cylinder, the control circuit board controls the high-voltage package to make the ignition pin ignite, which has the advantages of reliable and stable operation.

[0018] Compared with the prior art, the present fuel oil heater has the following advantages:

[0019] 1. When it is necessary to stop working, the electronic fuel injection pump stops supplying oil. At this time, the oil return end of the oil return solenoid valve is in an open state, and the fuel in the above-mentioned oil pipe returns to the fuel tank through the oil return end of the oil return solenoid valve, avoiding the excess fuel in the oil pipe from entering the combustion cylinder and then causing incomplete combustion and black smoke, which has the advantages of accurate oil supply and reliable operation;

[0020] 2. By providing a nozzle front cover, the fan sends air into the combustion cylinder through the nozzle front cover, which has the advantages of better air supply effect and relatively simple structure;

[0021] 3. The air flowing through the nozzle front cover is guided to the inner side wall of the combustion cylinder through the air guide holes, so that the air and the oil mist in the combustion cylinder can be better mixed, improving the combustion efficiency;

[0022] 4. When the temperature sensor on the outer cover senses that the temperature exceeds the set temperature, the temperature sensor sends a signal to the control circuit board, and the control circuit board controls the electronic fuel injection pump to stop working, which can avoid the over-high temperature of the outer cover and improve the use safety. Description of the Drawings

[0023] Figure 1 is a sectional view of the present fuel oil heater.

[0024] Figure 2 is Figure 1 the A-A sectional view of

[0025] In the figure, 1 is the fuel tank; 2 is the outer cover; 3 is the combustion cylinder; 3a is the oil and gas inlet; 4 is the radiator fin; 5 is the fuel injector; 6 is the ignition pin; 7 is the fan; 8 is the electronic fuel injection pump; 9 is the oil return solenoid valve; 10 is the first oil pipe; 11 is the second oil pipe; 12 is the front cover of the fuel injector; 12a is the air guiding part; 12b is the air guiding hole; 13 is the fuel injector seat; 14 is the air guiding impeller; 15 is the heat insulating fiber layer; 16 is the cooling cavity; 17 is the cooling fan; 18 is the protective net; 19 is the temperature sensor; 20 is the vibration sensor; 21 is the photosensitive sensor. Detailed implementation mode

[0026] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0027] As Figures 1 to 2 shown, the fuel warm air blower includes a fuel tank 1 and an outer cover 2 fixedly connected to the fuel tank 1. A combustion cylinder 3 is fixedly connected inside the outer cover 2. A radiator fin 4 is fixedly connected to the front end of the combustion cylinder 3. The inner end of the combustion cylinder 3 has an oil and gas inlet 3a. At the oil and gas inlet 3a, there are a fuel injector 5, an ignition pin 6 and a fan 7. The air outlet of the fan 7 and the fuel injection port of the fuel injector 5 both face the oil and gas inlet 3a. An electronic fuel injection pump 8 and an oil return solenoid valve 9 are provided in the fuel tank 1. The oil return solenoid valve 9 has an oil inlet end, an oil outlet end and an oil return end. The oil inlet end of the oil return solenoid valve 9 is connected to the oil outlet end of the electronic fuel injection pump 8 through the first oil pipe 10. The oil outlet end of the oil return solenoid valve can be connected to the fuel injector 5 through the second oil pipe 11. The oil return end of the oil return solenoid valve 9 is connected to the fuel tank 1, and when the electronic fuel injection pump 8 stops supplying fuel to the fuel injector 5, the oil return end of the oil return solenoid valve 9 is in an open state.

[0028] This fuel warm air blower includes a control circuit board. A temperature sensor 19 is provided on the outer cover 2, and a vibration sensor 20 is provided on the fuel tank 1. The electronic fuel injection pump 8, the oil return solenoid valve 9, the temperature sensor 19 and the vibration sensor 20 are all connected to the control circuit board. A photosensitive sensor 21 is provided on the outer cover 2. The photosensitive sensor 21 is connected to the control circuit board, and the photosensitive sensor 21 can sense the light inside the combustion cylinder 3.

[0029] A nozzle front cover 12 in a cylindrical shape is coaxially and fixedly connected to the oil and gas inlet 3a. The nozzle front cover 12 is penetrated through from front to back. The fan 7 is located outside the nozzle front cover 12 and the air outlet of the fan 7 faces the inner side of the nozzle front cover 12. A nozzle seat 13 in a cylindrical shape is fixedly connected between the nozzle front cover 12 and the fan 7. The fuel injector 5 is fixedly connected to the middle of the nozzle seat 13 and is coaxially arranged with the combustion cylinder 3, and the fuel injection port of the fuel injector 5 faces the nozzle front cover 12. A wind guiding impeller 14 is coaxially arranged at the inner end of the fuel injector 5. The inner end of the nozzle front cover 12 has a wind guiding part 12a which is coaxially arranged and in a conical cylinder shape. The outer side wall of the wind guiding part 12a is annularly provided with through wind guiding holes 12b, and the wind guiding holes 12b guide to the inner side wall of the combustion cylinder 3.

[0030] The outer side wall of the combustion cylinder 3 is provided with a heat insulating fiber layer 15 and the heat insulating fiber layer 15 is located inside the outer cover 2. A cooling cavity 16 is formed between the outer side wall of the heat insulating fiber layer 15 and the inner side wall of the outer cover 2. A cooling fan 17 is arranged inside the outer cover 2. The outer end of the outer cover 2 is fixedly connected with a protective net 18, and the protective net 18 covers the outside of the heat sink 4, preventing scalding, and having the advantage of being relatively safe in use.

[0031] During operation, start the electronic fuel injection pump 8 to deliver fuel to the return oil solenoid valve 9 and supply fuel to the fuel injector 5 through the second oil pipe 11. The fuel injector 5 injects fuel into the oil and gas inlet 3a of the combustion cylinder 3. At the same time, the fan 7 sends air into the nozzle front cover 12. The air is guided to the inner side wall of the nozzle front cover 12 through the wind guiding impeller 14, and then the air flowing through the nozzle front cover 12 is guided to the inner side wall of the combustion cylinder 3 through the wind guiding holes 12b of the nozzle front cover 12, so that the air and the oil mist in the combustion cylinder 3 can be better mixed. Control the high-voltage package connected to the ignition needle 6 to work through the control circuit board to make the ignition needle 6 ignite, so that the fuel and air burn in the combustion cylinder 3. When the photosensitive sensor 21 detects that there is a flame in the combustion cylinder 3, the control circuit board controls the high-voltage package to make the ignition needle 6 stop igniting; when the photosensitive sensor detects that there is no flame in the combustion cylinder 3, the control circuit board controls the high-voltage package to make the ignition needle ignite.

[0032] The cooling fan 17 is located below the combustion cylinder 3 and the air outlet of the cooling fan 17 faces upward and blows towards the cooling cavity 16, cooling the combustion cylinder 3 and the outer cover 2, and having the advantages of safe use and improved service life.

[0033] When it is necessary to stop working, the electronic fuel injection pump 8 stops fuel supply. At this time, the fuel return end of the fuel return solenoid valve 9 is in an open state, and the fuel in the above-mentioned fuel pipe returns to the fuel tank 1 through the fuel return end of the fuel return solenoid valve 9, avoiding the excess fuel in the fuel pipe from entering the combustion chamber 3 and then causing incomplete combustion and black smoke. It has the advantages of accurate fuel supply and reliable operation. The electronic fuel injection pump 8 is an electronic fuel injection pump (application number: 2016205411033), and the electronic fuel injection pump 8 is a motorcycle electronic fuel injection pump (application number: 2017213235396). Using the electronic fuel injection pump 8 has the advantages of higher fuel supply accuracy and lower cost.

[0034] The fuel return solenoid valve 9 and the electronic fuel injection pump 8 are controlled by the control circuit board, which has the advantages of convenient control and relatively accurate control. When the temperature sensor 19 on the outer cover 2 senses that the temperature exceeds the set temperature, the temperature sensor 19 sends a signal to the control circuit board, and the control circuit board controls the electronic fuel injection pump 8 to stop working, which can avoid the overheating of the outer cover 2 and improve the use safety. When the vibration sensor 20 senses that the vibration value of the fuel tank 1 reaches the set value, the control circuit board controls the electronic fuel injection pump 8 to stop working, which improves the use safety.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0036] Although terms such as fuel tank 1, outer cover 2, combustion chamber 3, oil and gas inlet 3a, heat sink 4, fuel injector 5, ignition pin 6, fan 7, electronic fuel injection pump 8, fuel return solenoid valve 9, fuel pipe 1 10, fuel pipe 2 11, fuel injector front cover 12, air guiding part 12a, air guiding hole 12b, fuel injector seat 13, air guiding impeller 14, heat insulating fiber layer 15, cooling cavity 16, cooling fan 17, protective net 18, temperature sensor 19, vibration sensor 20, photosensitive sensor 21 are used more in this article, the possibility of using other terms is not excluded. Using these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. Fuel air heater, comprising a fuel tank (1) and an outer cover (2) fixedly connected to the fuel tank (1), a combustion cylinder (3) is fixedly connected inside the outer cover (2), a heat sink (4) is fixedly connected to the front end of the combustion cylinder (3), an oil and gas inlet (3a) is provided at the inner end of the combustion cylinder (3), an injector (5), an ignition pin (6) and a blower (7) are provided at the oil and gas inlet (3a), the air outlet of the blower (7) and the oil injection port of the injector (5) both face the oil and gas inlet (3a), characterized in that, The fuel tank (1) is provided with an electronic fuel injection pump (8) and a return oil solenoid valve (9). The return oil solenoid valve (9) has an oil inlet end, an oil outlet end and a return oil end. The oil inlet end of the return oil solenoid valve (9) is connected to the oil outlet end of the electronic fuel injection pump (8) through a first oil pipe (10). The oil outlet end of the return oil solenoid valve (9) can be connected to the fuel injector (5) through a second oil pipe (11). The return oil end of the return oil solenoid valve (9) is connected to the fuel tank (1). When the electronic fuel injection pump (8) stops supplying oil to the fuel injector (5), the return oil end of the return oil solenoid valve (9) is in an open state. A cylindrical fuel injector front cover (12) is coaxially fixed at the oil and gas inlet (3a). The fuel injector front cover (12) is through from front to back. The fan (7) is located outside the fuel injector front cover (12) and the air outlet of the fan (7) faces the inside of the fuel injector front cover (12). The inner end of the fuel injector front cover (12) has a coaxially arranged conical guide part (12a) in the shape of a conical cylinder. The large end of the guide part (12a) faces the front end of the combustion cylinder (3), and the small end of the guide part (12a) faces the fuel injector (5). The outer side wall of the guide part (12a) is provided with through air guide holes (12b), and the air guide holes (12b) guide to the inner side wall of the combustion cylinder (3).

2. The fuel-fired heater according to claim 1, characterized in that, This fuel heater includes a control circuit board. The electronic fuel injection pump (8) and the return oil solenoid valve (9) are both connected to the control circuit board.

3. The fuel-fired heater according to claim 2, characterized in that A cylindrical fuel injector seat (13) is fixed between the fuel injector front cover (12) and the fan (7). The fuel injector (5) is fixed in the middle of the fuel injector seat (13) and is coaxially arranged with the combustion cylinder (3), and the fuel injection port of the fuel injector (5) faces the fuel injector front cover (12).

4. The fuel air heater according to claim 1 or 2 or 3, characterized in that, A guide wind impeller (14) is arranged at the inner end of the fuel injector (5).

5. The fuel-fired heater according to claim 1 or 2 or 3, characterized in that, A heat insulation fiber layer (15) is arranged on the outer side wall of the combustion cylinder (3), and the heat insulation fiber layer (15) is located inside the outer cover (2).

6. The fuel-fired heater according to claim 5, characterized in that, A cooling cavity (16) is formed between the outer side wall of the heat insulation fiber layer (15) and the inner side wall of the outer cover (2). A cooling fan (17) is arranged inside the outer cover (2). The cooling fan (17) is located below the combustion cylinder (3), and the air outlet of the cooling fan (17) faces upward and blows towards the cooling cavity (16).

7. The fuel-fired heater according to claim 2 or 3, characterized in that, A temperature sensor (19) is arranged on the outer cover (2), and the temperature sensor (19) is connected to the control circuit board.

8. The fuel-fired heater according to claim 2 or 3, characterized in that, A vibration sensor (20) is arranged on the fuel tank (1), and the vibration sensor (20) is connected to the control circuit board.

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