A disc-type coil heating flame preheating plug and a diesel engine

Abstract

The present invention discloses a disc-type coil heating type flame preheating plug and a diesel engine, belonging to the technical field of engine cold start auxiliary system. The disc-type coil heating type flame preheating plug comprises a flame cover, a disc-shaped electromagnetic induction coil, a disc-shaped electromagnetic induction heating element, an evaporation net and an oil pipe, wherein the wall of the flame cover is provided with ventilation holes, and the bottom of the flame cover is coaxially provided with a disc-shaped electromagnetic induction coil; the disc-shaped electromagnetic induction heating element is coaxially provided on the top surface of the disc-shaped electromagnetic induction coil; the evaporation net is coaxially provided on the top surface of the disc-shaped electromagnetic induction heating element; one end of the oil pipe passes through the flame cover and is inserted into the evaporation net, and the other end can be connected to the oil pump; the inner cavity of the flame cover forms a mixed gas cavity. The disc-type coil heating type flame preheating plug can significantly improve the cold start performance of the diesel engine in extremely cold and harsh environments.

Description

Technical Field

[0001] The invention belongs to the technical field of engine cold start auxiliary systems, and in particular relates to a disc-type coil heating type flame preheating plug and a diesel engine. Background Art

[0002] During the cold start process of a diesel engine in a low temperature environment, the temperature and pressure in the cylinder at the end of compression are much lower than those under normal conditions due to reasons such as low intake temperature, engine body temperature and oil temperature, high oil viscosity and large air leakage. The fuel atomization effect is poor, resulting in deterioration of the formation of the mixture in the cylinder and the combustion process, causing the diesel engine to take a long time to start, and even causing problems such as difficulty in starting the diesel engine, poor power performance and serious emission pollution.

[0003] A commonly used diesel engine cold start auxiliary device is an intake preheating device. By installing the intake preheating device at the front end of the diesel engine intake pipe, the intake air is preheated to increase the intake temperature so that the cylinder temperature at the compression top dead center exceeds the critical auto-ignition temperature of the diesel spray, thereby improving fuel atomization, shortening the ignition delay period, and thus improving the cold start performance of the diesel engine.

[0004] However, most of the existing flame intake preheating devices heat the intake air by igniting the diesel on the surface through electric heating rods or heating wires. However, in low-temperature environments, the electrolyte of the onboard power battery of the car has low activity, poor performance and is prone to power loss, while the heating of electric heating rods or heating wires requires a higher starting voltage, which consumes a lot of battery power. In addition, the contact area and contact time between the electric heating rods or heating wires and the diesel are small, resulting in poor diesel gasification effect, which in turn causes low efficiency of intake preheating, making the probability of ignition of the diesel engine in low-temperature environments low. The above defects greatly reduce the applicability of the preheating plug in different low-temperature environments and the cold start performance of the engine in low-temperature harsh environments. Summary of the invention

[0005] In view of this, the present invention provides a disc-type coil heating flame preheating plug, which can ensure the normal cold start of the diesel engine under low temperature conditions.

[0006] The present invention adopts the following technical solutions:

[0007] A disc-shaped coil heating flame preheating plug comprises a flame cover, a disc-shaped electromagnetic induction coil, a disc-shaped electromagnetic induction heating element, an evaporation net and an oil pipe;

[0008] The wall surface of the flame cover is provided with ventilation holes, and the bottom of the flame cover is coaxially provided with the disc-shaped electromagnetic induction coil;

[0009] The disc-shaped electromagnetic induction heating element is coaxially arranged on the top surface of the disc-shaped electromagnetic induction coil;

[0010] The evaporation net is coaxially arranged on the top surface of the disc-shaped electromagnetic induction heating element;

[0011] One end of the oil pipe passes through the flame cover and is inserted into the evaporation net, and the other end can be connected to the oil pump;

[0012] The inner cavity of the flame cover forms a mixed gas cavity.

[0013] Furthermore, an oil storage tank is provided on the top surface of the disc-shaped electromagnetic induction heating element.

[0014] Furthermore, it also includes a shell, which is coaxially arranged outside the flame cover, and air flows into the cylindrical space between the shell and the flame cover and then enters the flame cover through the ventilation hole.

[0015] Furthermore, it also includes an air cyclone, which is coaxially installed on the bottom of the flame cover, and the air enters the cylindrical space after passing through the air cyclone.

[0016] Furthermore, an annular flame stabilizing plate is coaxially arranged on the top of the flame cover.

[0017] Furthermore, a supporting platform with through holes is provided at the bottom of the flame cover;

[0018] The disc-shaped electromagnetic induction coil is carried on the top surface of the supporting platform and can be electrically connected to the vehicle-mounted power supply through the through hole.

[0019] Furthermore, the disc-shaped electromagnetic induction heating element is a ferromagnetic heating plate.

[0020] In addition, the present invention also provides a diesel engine, in which the above-mentioned disc-type coil heating type flame preheating plug is installed in the intake pipe of the diesel engine.

[0021] Furthermore, the axial direction of the disc-coil heating flame preheating plug is parallel to the air flow direction in the intake pipe.

[0022] Beneficial effects:

[0023] 1. The wall of the flame hood is provided with ventilation holes, and the bottom of the flame hood is coaxially provided with a disc-shaped electromagnetic induction coil; the disc-shaped electromagnetic induction heating element is coaxially provided on the top surface of the disc-shaped electromagnetic induction coil; the evaporation net is coaxially provided on the top surface of the disc-shaped electromagnetic induction heating element; one end of the oil pipe passes through the flame hood and is inserted into the evaporation net, and the other end can be connected to the oil pump; the inner cavity of the flame hood forms a mixed gas cavity.

[0024] In this way, alternating current is applied to the electromagnetic induction coil, so that the electromagnetic induction heating element forms eddy currents and generates heat. The skin effect and proximity effect of the high-frequency current cause the surface temperature of the electromagnetic induction heating element to rise rapidly. On the one hand, the frequency design of the alternating current passed into the electromagnetic induction coil can realize effective control of the heating power, shorten the heating time, increase the heating temperature, and improve the applicability of the preheating plug in different low-temperature environments; on the other hand, heating by the electromagnetic induction coil can effectively reduce the consumption of the battery and extend the battery life in extremely cold environments. Moreover, the use of disc-shaped electromagnetic induction heating elements as heating elements can effectively increase the contact area with diesel and its mixture. Overall, the preheating plug optimizes the oil-gas mixing process, can effectively preheat the intake air, increase the intake temperature, improve the fuel gasification effect, shorten the ignition delay period, and significantly improve the cold start performance of the diesel engine in extremely cold and harsh environments.

[0025] 2. The top surface of the disc-shaped electromagnetic induction heating element is provided with an oil storage tank, which can store the ungasified diesel and increase the contact area with the ungasified diesel, thereby promoting the further gasification of the diesel.

[0026] 3. The shell is coaxially arranged outside the flame cover. The air flows into the cylindrical space between the shell and the flame cover and then enters the flame cover through the ventilation holes. In this way, it can be avoided that the intake air directly enters the flame cover and causes blowout.

[0027] 4. The air cyclone is coaxially installed at the bottom of the flame hood, and the air enters the cylindrical space after passing through the air cyclone. In this way, the air cyclone plays a drainage role, allowing the air to enter the cylindrical space better, and then enter the flame hood through the ventilation holes to be preheated.

[0028] 5. An annular flame stabilizing plate is coaxially arranged on the top of the flame hood. In this way, part of the burnt high-temperature products formed after the combustion of the diesel will produce a reflux effect after passing through the flame stabilizing plate, and then the flame will form a vortex near the flame stabilizing plate, that is, a continuous ignition source with automatic compensation capability is formed to continuously ignite fresh unburned combustible mixture, thereby achieving the effect of stabilizing the flame.

[0029] 6. The axial direction of the disc-type coil heating flame preheating plug is parallel to the air flow direction in the diesel engine intake pipe, which enables the air to enter the flame cover more smoothly to be preheated, and flow out of the flame cover and into the engine cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A cross-sectional view of a disc-type coil heating flame preheating plug provided by an embodiment of the present invention;

[0031] Figure 2 for Figure 1 The cross-section along the line B-B in the middle;

[0032] Figure 3 for Figure 1 Sectional view along line C-C;

[0033] Figure 4 A schematic diagram of the external structure of a disc-type coil heating flame preheating plug provided in an embodiment of the present invention;

[0034] Figure 5 for Figure 4 A top view of

[0035] Figure 6 A schematic structural diagram of a diesel engine provided by an embodiment of the present invention.

[0036] Among them, 1 - air cyclone, 2 - wiring hole, 3 - disc-shaped electromagnetic induction coil, 4 - disc-shaped electromagnetic induction heating element, 5 - oil storage tank, 6 - evaporation network, 7 - oil inlet channel, 8 - oil pipe, 9 - flame cover, 10 - ventilation hole, 11 - mixed gas chamber, 12 - flame stabilizing plate, 13 - shell, 14 intake pipe, 15 - preheating plug, 16 - cylinder. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0038] Embodiment 1:

[0039] like Figure 1 to Figure 5 As shown, a disc-type coil heating flame preheating plug 15 comprises a flame cover 9, a disc-shaped electromagnetic induction coil 3, a disc-shaped electromagnetic induction heating element 4, an evaporation net 6 and an oil pipe 8, wherein:

[0040] The wall of the flame cover 9 is provided with ventilation holes 10, and the shape, number and position of the ventilation holes 10 can be set according to needs and actual conditions. A supporting platform with a through hole is provided at the bottom of the flame cover 9, and the through hole is used as a wiring hole 2. The disc-shaped electromagnetic induction coil 3 is carried on the top surface of the supporting platform, and the disc-shaped electromagnetic induction coil 3 is coaxially arranged with the flame cover 9, and can maintain electrical connection with a vehicle power supply such as a battery through the wiring hole 2. The disc-shaped electromagnetic induction heating element 4 is a ferromagnetic heating plate, and the ferromagnetic heating plate is coaxially arranged on the top surface of the disc-shaped electromagnetic induction coil 3; the evaporation net 6 is coaxially arranged on the top surface of the disc-shaped electromagnetic induction heating element 4, and an oil inlet channel 7 is generated in the evaporation net 6 by punching; one end of the oil pipe 8 passes through the flame cover 9 and then is inserted into the evaporation net 6 through the oil inlet channel 7, and the other end can be connected to the oil pump, so that the diesel can be directly sprayed into the evaporation net 6, and effectively gasified by the heating of the high-temperature ferromagnetic heating plate 4; the inner cavity of the flame cover 9 above the evaporation net 6 forms a mixed gas cavity 11.

[0041] In this way, the disc-shaped electromagnetic induction coil 3 is supplied with alternating current, so that the disc-shaped electromagnetic induction heating element 4 forms eddy current and generates heat. The skin effect and proximity effect of the high-frequency current cause the surface temperature of the disc-shaped electromagnetic induction heating element 4 to rise rapidly. On the one hand, the frequency design of the alternating current passed into the disc-shaped electromagnetic induction coil 3 can realize effective control of the heating power, shorten the heating time, increase the heating temperature, and improve the applicability of the preheating plug 15 in different low-temperature environments; on the other hand, heating by the disc-shaped electromagnetic induction coil 3 can effectively reduce the consumption of the battery and extend the battery life in extremely cold environments. Moreover, the use of the disc-shaped electromagnetic induction heating element 4 as a heating element can effectively increase the contact area with diesel and its mixture. In general, the preheating plug 15 optimizes the oil-gas mixing process, can effectively preheat the intake air, increase the intake temperature, improve the fuel gasification effect, shorten the ignition delay period, and significantly improve the cold start performance of the diesel engine in extremely cold and harsh environments.

[0042] As an improvement, the top surface of the disc-shaped electromagnetic induction heating element 4 is provided with an oil storage tank 5, which can store the ungasified diesel and increase the contact area with the ungasified diesel, thereby promoting further gasification of the diesel.

[0043] Embodiment 2:

[0044] On the basis of the first embodiment, a shell 13 is coaxially arranged outside the flame hood 9, and the flame hood 9 is located in the lower inner cavity of the shell 13. At this time, the air flows into the cylindrical space between the shell 13 and the flame hood 9 and then enters the flame hood 9 through the ventilation holes 10. In this way, the problem of blowout caused by the intake air directly entering the flame hood 9 can be avoided. In addition, an air cyclone 1 is coaxially installed at the bottom end of the flame hood 9, so that the air enters the cylindrical space after passing through the air cyclone 1. Specifically, the air cyclone 1 is fixed together with the flame hood 9 and the shell 13 by fixing nuts. In this way, the air cyclone 1 plays a guiding role, allowing the air to enter the cylindrical space at a higher flow rate and a larger intake volume, and then enter the flame hood 9 through the ventilation holes 10 to promote the oil-gas mixing process and be preheated.

[0045] As a further improvement, an annular flame stabilizing plate 12 is coaxially arranged on the top of the flame hood 9, and the flame stabilizing plate 12 connects the inner wall of the shell 13 with the top of the flame hood 9. In this way, part of the burned high-temperature products formed after the combustion of the diesel will produce a backflow effect after passing through the flame stabilizing plate 12, and then the flame will form a vortex near the flame stabilizing plate 12, that is, a continuous ignition source with automatic compensation capability is formed to continuously ignite fresh unburned combustible mixture, thereby achieving the effect of stabilizing the flame.

[0046] The working principle of the preheating plug is as follows: turn on the vehicle power supply, the electromagnetic induction coil 3 is connected to the vehicle battery after being externally connected to the inverter through the wiring hole 2, so that the direct current generated by the vehicle battery is inverted into high-frequency alternating current. The high-frequency alternating current establishes a high-frequency magnetic field in the disc-shaped electromagnetic induction coil 3. At this time, closed magnetic lines of force will be generated along the radius direction of the disc-shaped electromagnetic induction coil 3. The magnetic lines of force are coupled to the ferromagnetic heating plate through the magnetic circuit formed by the disc-shaped electromagnetic induction coil 3 and the ferromagnetic heating plate, forming eddy currents in the ferromagnetic heating plate to generate heat. Due to the skin effect and proximity effect of the high-frequency current, the ferromagnetic heating plate is close to the surface of the disc-shaped electromagnetic induction coil 3, the current density is large, and it can be quickly heated in a short time. After heating for a certain period of time, the diesel fuel is sprayed into the evaporation net 6 through the oil pipe 8 and the oil inlet 7 at a certain flow rate and is accompanied by gasification. The gasified diesel fuel vapor is mixed with the air entering the flame cover 9 from the ventilation hole 10 to form a combustible mixed gas. The mixed gas forms a high-temperature flame in the mixed gas chamber 11. The high-temperature flame can quickly increase the intake temperature, increase the cylinder temperature and cylinder pressure at the compression top dead center, and ensure the normal start of the engine in an extremely cold environment. In addition, the current in the disc-shaped electromagnetic induction coil 3 can be controlled by the switch in the inverter, and the on-off time of the switch, that is, the duty cycle of the PWM signal, can be determined according to the magnitude of the current, thereby controlling and adjusting the heating temperature of the ferromagnetic heating plate 4.

[0047] Embodiment three:

[0048] This embodiment provides a diesel engine based on the first or second embodiment, which has the disc-type coil heating flame preheating plug 15 of the first embodiment installed on the intake pipe, and the axial direction of the flame cover 9 of the disc-type coil heating flame preheating plug 15 is parallel to the air flow direction in the intake pipe 14.

[0049] In this embodiment, the axial direction of the flame hood 9 of the disc-type coil heating flame preheating plug 15 is parallel to the air flow direction in the diesel engine intake pipe 14. The flame in the flame hood 9 is not easily blown out, and the air can enter the flame hood more smoothly to be preheated, and flow out of the flame hood and enter the cylinder 16 of the engine.

[0050] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A disc-type coil heating flame preheating plug, characterized in that: It includes a flame cover, a disc-shaped electromagnetic induction coil, a disc-shaped electromagnetic induction heating element, an evaporation net and an oil pipe; The wall surface of the flame cover is provided with ventilation holes, and the bottom of the flame cover is coaxially provided with the disc-shaped electromagnetic induction coil; The disc-shaped electromagnetic induction heating element is coaxially arranged on the top surface of the disc-shaped electromagnetic induction coil; The evaporation net is coaxially arranged on the top surface of the disc-shaped electromagnetic induction heating element; One end of the oil pipe passes through the flame cover and is inserted into the evaporation net, and the other end can be connected to the oil pump; The inner cavity of the flame cover forms a mixed gas cavity; The top surface of the disc-shaped electromagnetic induction heating element is provided with an oil storage tank; Also includes a housing; The shell is coaxially arranged outside the flame cover, and air flows into the cylindrical space between the shell and the flame cover and then enters the flame cover through the ventilation hole; Also included is an air cyclone; The air cyclone is coaxially mounted on the bottom of the flame cover, and the air enters the cylindrical space after passing through the air cyclone; An annular flame stabilizing plate is coaxially arranged on the top of the flame cover; and the flame stabilizing plate connects the inner wall of the shell with the top of the flame cover; A supporting platform with through holes is provided at the bottom of the flame cover; The disc-shaped electromagnetic induction coil is carried on the top surface of the supporting platform and can be electrically connected to the vehicle-mounted power supply through the through hole.

2. A disc-type coil heating flame glow plug according to claim 1, characterized in that: The disc-shaped electromagnetic induction heating element is a ferromagnetic heating plate.

3. A diesel engine, characterized in that: A disc-coil-heated flame glow plug as claimed in any one of claims 1 to 2 is installed in the air intake pipeline.

4. A diesel engine according to claim 3, characterized in that: The axial direction of the disc-type coil heating flame preheating plug is parallel to the air flow direction in the intake pipeline.

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