A spiral coil heating flame preheating plug and a diesel engine

Abstract

The present invention discloses a spiral coil heating flame preheating plug and a diesel engine, belonging to the technical field of engine cold start auxiliary system. The spiral coil heating flame preheating plug comprises a flame cover, a shell, an electromagnetic induction evaporation net, an oil inlet pipe and an electromagnetic induction spiral coil, wherein the wall of the flame cover is provided with ventilation holes, and is coaxially arranged in the inner cavity of the lower part of the shell; the electromagnetic induction evaporation net is sandwiched between the inner wall of the shell and the outer wall of the flame cover; one end of the oil inlet pipe is connected to the electromagnetic induction evaporation net, and the other end can be connected to the oil pump; the electromagnetic induction wire spiral coil is spirally wound on the outer wall of the shell and the position corresponding to the electromagnetic induction evaporation net; the inner cavity of the upper part of the shell forms a mixed gas cavity. The spiral coil heating 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 spiral 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 spiral 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 spiral coil heating type flame preheating plug, comprising a flame cover, a shell, an electromagnetic induction evaporation net, an oil inlet pipe and an electromagnetic induction spiral coil;

[0008] The wall surface of the flame cover is provided with ventilation holes, which are coaxially arranged in the inner cavity at the lower part of the shell;

[0009] The electromagnetic induction evaporation net is sandwiched between the inner wall of the shell and the outer wall of the flame cover;

[0010] One end of the oil inlet pipe is connected to the electromagnetic induction evaporation network, and the other end can be connected to the oil pump;

[0011] The electromagnetic induction wire spiral coil is wound in a spiral shape on the outer wall of the shell at a position corresponding to the electromagnetic induction evaporation net;

[0012] The inner cavity at the upper part of the shell forms a mixed gas cavity.

[0013] Further, it also includes an air cyclone;

[0014] The air cyclone is coaxially mounted on the shell and the bottom end of the flame cover, and is used to guide air into the flame cover.

[0015] Furthermore, the flame cover is made of ferromagnetic material.

[0016] Furthermore, an annular flame stabilizing plate is coaxially arranged in the inner cavity of the shell;

[0017] The flame stabilizing plate is located on the top of the flame cover and is used to generate a vortex in the flame.

[0018] Furthermore, an electromagnetic induction evaporation net is sandwiched between the top of the flame cover and the flame stabilizing plate.

[0019] Furthermore, the ventilation holes are strip-shaped ventilation holes.

[0020] In addition, the present invention also provides a diesel engine, in which the above-mentioned spiral coil heating type flame preheating plug is installed in the intake pipe of the diesel engine, and the axial direction of the spiral coil heating type flame preheating plug is parallel to the air flow direction in the intake pipe.

[0021] Beneficial effects:

[0022] 1. The wall of the flame hood is provided with ventilation holes, which are coaxially arranged in the inner cavity at the lower part of the shell; the electromagnetic induction evaporation net is clamped between the inner wall of the shell and the outer wall of the flame hood; one end of the oil inlet pipe is connected to the electromagnetic induction evaporation net, and the other end can be connected to the oil pump; the electromagnetic induction spiral coil is spirally wound around the outer wall of the shell and the position corresponding to the electromagnetic induction evaporation net; the upper inner cavity of the shell forms a mixed gas cavity.

[0023] In this way, alternating current is applied to the electromagnetic induction spiral coil, so that the electromagnetic induction evaporation net 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 evaporation net to rise rapidly. On the one hand, the frequency design of the alternating current passed into the electromagnetic induction spiral 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 through the electromagnetic induction spiral coil can effectively reduce the consumption of the battery and extend the battery life in extremely cold environments; moreover, the use of the electromagnetic induction evaporation net as a heating element can increase the contact area with the mixed gas while storing diesel, and promote the gasification of diesel. In general, 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.

[0024] 2. The air cyclone is coaxially installed at the bottom end of the shell and the flame cover, which can guide the air into the flame cover, further optimizing the air preheating effect.

[0025] 3. The flame cover is made of ferromagnetic material, so the flame cover can also generate vortexes, which can further promote the formation of the mixed gas and further optimize the air preheating effect.

[0026] 4. An annular flame stabilizing plate is coaxially arranged in the inner cavity of the shell, and the flame stabilizing plate is located at the top of the flame cover. In this way, part of the burned high-temperature products formed after the combustion of diesel will flow back 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.

[0027] 5. An electromagnetic induction evaporation net is sandwiched between the top of the flame hood and the flame stabilizing plate, which increases the contact area between diesel and air and further improves the air preheating effect.

[0028] 6. The axial direction of the spiral coil heating flame preheating plug is parallel to the air flow direction in the diesel engine intake pipe, which can make the air enter the flame cover more smoothly to be preheated and prevent the flame from being blown out. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A cross-sectional view of a spiral coil heating type flame preheating plug provided in the first embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the external structure of a spiral coil heating flame preheating plug provided in the first embodiment of the present invention;

[0031] Figure 3This is a schematic structural diagram of a diesel engine provided in Embodiment 2 of the present invention.

[0032] Among them, 1 - air cyclone, 2 - oil inlet nozzle, 3 - oil inlet pipe, 4 - electromagnetic induction spiral coil, 5 - electromagnetic induction evaporation net, 6 - flame cover, 7 - ventilation hole, 8 - mixed gas chamber, 9 - flame stabilizing plate, 10 - shell, 11 - preheating plug, 12 - intake pipe, 13 - cylinder. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0034] Embodiment 1:

[0035] like Figure 1-2 As shown, a spiral coil heating flame preheating plug 11, which comprises a flame cover 6, a shell 10, an electromagnetic induction evaporation net 5, an oil inlet pipe 3 and an electromagnetic induction spiral coil 4, wherein:

[0036] The wall of the flame cover 6 is provided with strip-shaped ventilation holes 7, the shape, number and position of the ventilation holes 7 can be set according to the needs and actual conditions, and the flame cover 6 is coaxially arranged in the inner cavity at the lower part of the shell 10, and a ferromagnetic electromagnetic induction evaporation net 5 is sandwiched between the inner wall of the shell 10 and the outer wall of the flame cover 6, and an air cyclone 1 is coaxially installed at the bottom end of the shell 10 and the flame cover 6, and the air cyclone 1 can play the role of guiding air flow, guiding air to flow into the preheat plug shell 10, improving the air flow rate and increasing the intake volume of the preheat plug 11, and the air cyclone 1, the flame cover 6 and the shell 10 can be connected together by welding to form a whole. The side opening of the air cyclone 1 forms an oil inlet nozzle 2, one end of the oil inlet pipe 3 can be connected to the oil pump, and the other end is deep into the oil inlet nozzle 2, and the oil inlet nozzle 2 leads to the electromagnetic induction evaporation net 5, so that the diesel sprayed from the oil inlet pipe 3 can flow to the electromagnetic induction evaporation net 5 through the channel of the oil supply nozzle 2. The electromagnetic induction spiral coil 4 is spirally wound on the outer wall of the housing 10 at a position corresponding to the evaporation net 5, and the number of windings and the pitch can be flexibly adjusted according to actual conditions. The inner cavity at the upper part of the housing 10 forms a mixed gas cavity 8.

[0037] In this way, the electromagnetic induction spiral coil 4 is used for heating to form eddy currents in the electromagnetic induction evaporation net 5 and generate heat. The skin effect and proximity effect of the high-frequency current cause the surface temperature of the electromagnetic induction evaporation net 5 to rise rapidly. On the one hand, the frequency design of the alternating current passed into the electromagnetic induction spiral coil 4 can realize effective control of the heating power, shorten the heating time, increase the heating temperature, and improve the applicability of the preheating plug 11 in different low-temperature environments; on the other hand, heating by the electromagnetic induction spiral coil 4 can effectively reduce the consumption of the battery and extend the battery life in extremely cold environments. Moreover, the use of the electromagnetic induction evaporation net 5 as a heating element can increase the contact area with the mixed gas while storing diesel, and promote the gasification of diesel. In summary, the preheating plug 11 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.

[0038] More specifically, the top of the flame cover 6 is closed, so that the air can only flow out of the electromagnetic induction evaporation net 5 after being mixed with the diesel gasified on the electromagnetic induction evaporation net 5 and preheated, further optimizing the preheating effect of the air. Moreover, the flame cover 6 is made of ferromagnetic material, so that the flame cover 6 can also generate eddy currents, which can further promote diesel gasification and the formation of mixed gas, and optimize the preheating effect of the air.

[0039] As an improvement, an annular flame stabilizing plate 9 is coaxially arranged in the inner cavity of the shell 10 near the top of the flame cover 6. In this way, part of the burned high-temperature products formed after the combustion of the diesel will produce a reflux effect after passing through the flame stabilizing plate 9, and then the flame will form a vortex near the flame stabilizing plate 9, 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.

[0040] In this embodiment, an electromagnetic induction evaporation net 5 is also sandwiched between the top of the flame cover 6 and the flame stabilizing plate 9, thereby increasing the contact area between the diesel and the air and further improving the air preheating effect.

[0041] The working principle of the preheating plug is as follows: turn on the vehicle power supply, connect the electromagnetic induction spiral coil 4 to the vehicle battery after being externally connected to the inverter, 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 electromagnetic induction spiral coil 4. At this time, closed magnetic lines of force will be generated along the radius direction of the electromagnetic induction spiral coil 4. The magnetic lines of force are coupled to the electromagnetic induction evaporation net 5 and the flame cover 6 through the magnetic loop formed by the electromagnetic induction spiral coil 4, the electromagnetic induction evaporation net 5 and the ferromagnetic flame cover 6. Due to the skin effect and proximity effect of the high-frequency current, the electromagnetic induction evaporation net 5 is close to the surface of the electromagnetic induction spiral coil 4, the current density is large, and it can be quickly evaporated in a short time. The flame hood 6 is heated to a certain extent. After a certain period of heating, the diesel oil is sprayed into the evaporation net 5 through the oil inlet pipe 3 and the oil inlet nozzle 2 at a certain flow rate and is accompanied by gasification. The gasified diesel vapor is mixed with the air coming out of the ventilation hole 7 to form a combustible mixture. When the temperature of the electromagnetic induction evaporation net 5 reaches the ignition point of the combustible mixture, the mixture can be ignited to form a high-temperature flame in the mixture cavity 8. The part of the burned high-temperature product formed by the combustion of the diesel oil produces a reflux effect after passing through the flame stabilizing plate 9. The flame forms a vortex near the sudden change section of the flame stabilizing plate 9, forming a continuous ignition source with automatic compensation capability to continuously ignite the fresh unburned combustible mixture, thereby achieving the purpose of stabilizing the flame. The 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.

[0042] Moreover, the current of the electromagnetic induction spiral coil 4 can be controlled by the switch in the inverter, and the on-off time of the switch can be determined according to the magnitude of the current, thereby controlling and adjusting the heating temperature of the electromagnetic induction evaporation net 5. The electromagnetic induction evaporation net 5 increases the contact area between air and diesel while storing diesel, which can promote the gasification of diesel. The temperature of the electromagnetic induction evaporation net 5 and the flame cover 6 heated by the electromagnetic induction spiral coil 4 rises rapidly, which can further promote the gasification of diesel and the formation of mixed gas.

[0043] Embodiment 2:

[0044] This embodiment provides a diesel engine based on the first embodiment. Figure 3 As shown, the diesel engine is equipped with a spiral coil heating flame preheating plug 11 in the first embodiment on the intake pipe, and the axial direction of the flame cover 6 of the spiral coil heating flame preheating plug 11 is parallel to the air flow direction in the intake pipe 12.

[0045] In this embodiment, the axial direction of the flame hood 6 of the spiral coil heating flame preheating plug 11 is parallel to the air flow direction in the diesel engine intake pipe 12. The flame in the flame hood 6 is not easily blown out, and the air can enter the flame hood 6 more smoothly to be preheated, and flow out of the flame hood 6 and enter the cylinder 13 of the engine.

[0046] 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 spiral coil heating flame preheating plug, characterized in that: It includes a flame cover, a shell, an electromagnetic induction evaporation net, an oil inlet pipe and an electromagnetic induction spiral coil; The wall surface of the flame cover is provided with ventilation holes, which are coaxially arranged in the inner cavity at the lower part of the shell; The electromagnetic induction evaporation net is sandwiched between the inner wall of the shell and the outer wall of the flame cover; One end of the oil inlet pipe is connected to the electromagnetic induction evaporation network, and the other end can be connected to the oil pump; The electromagnetic induction spiral coil is spirally wound around the outer wall of the shell and the position corresponding to the electromagnetic induction evaporation net; The inner cavity at the upper part of the shell forms a mixed gas cavity; Also included is an air cyclone; The air cyclone is coaxially mounted on the housing and the bottom end of the flame cover, and is used to guide air into the flame cover; The flame cover is made of ferromagnetic material; An annular flame stabilizing plate is coaxially arranged in the inner cavity of the shell; The flame stabilizing plate is located on the top of the flame cover and is used to make the flame generate a vortex; An electromagnetic induction evaporation net is sandwiched between the top of the flame cover and the flame stabilizing plate.

2. A spiral coil heating flame glow plug according to claim 1, characterized in that: The ventilation holes are strip-shaped ventilation holes.

3. A diesel engine, characterized in that: A spiral coil heating flame preheating plug as claimed in any one of claims 1 to 2 is installed in an intake pipe.

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

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