Glow plug for engine and engine

Abstract

The utility model provides a glow plug for an engine and the engine, and the glow plug comprises a body; one end of the heating part movably extends into the body, and the heating part is suitable for extending into an air cylinder of the engine to ignite fuel in the air cylinder under the condition of cold start of the engine; and the driving part is mounted in the body and is configured to drive the heating part to extend out of the body or contract towards the interior of the body, so that the heating part can extend into the air cylinder or be separated from the air cylinder. Therefore, the preheating plug is prevented from blocking flowing of airflow in the air cylinder and blocking oil beams injected into the air cylinder.

Description

Technical Field

[0001] At least one embodiment of the present utility model relates to the technical field of internal combustion engines, and particularly relates to a glow plug for an engine and an engine. Background Art

[0002] In the prior art, the ignition method of a diesel engine is compression ignition, which requires the gas inside the engine to reach or be higher than the self-ignition temperature of diesel under the compression of the piston. At normal temperature (25°C), the diesel engine can start normally, but in the case of low ambient temperature (below -20°C), the cold start of the diesel engine becomes very difficult. At this time, a separate heating device is required to heat the air inside the cylinder or ignite the fuel inside the cylinder.

[0003] To solve the above problems, the prior art provides a glow plug for an engine. The glow plug is installed inside the diesel engine and extends from outside the cylinder head into the cylinder. Under the action of current, the temperature of the head of the glow plug can be heated to above 800°C, which is sufficient to heat the air and ignite the fuel inside the cylinder, so as to solve the problem of difficult cold start of the diesel engine.

[0004] However, the running time of the engine in the cold start state is very short. The existing glow plugs for engines always extend into the cylinder during the entire operation cycle of the engine, so that in the normal operation state of the engine, the glow plugs become redundant structures inside the cylinder, hindering the flow of the air flow inside the cylinder and affecting the uniformity of the air-fuel mixture. Further, in the normal operation state of the engine, the glow plugs extending into the cylinder will also block the fuel spray inside the cylinder, causing the fuel spray to hit the glow plugs and not being atomized well. As a result, the combustion of the engine becomes worse, and the economy and power will be adversely affected. Summary of the Utility Model

[0005] In view of this, the embodiments of the present utility model provide a glow plug for an engine, which can avoid the glow plug from hindering the air flow inside the cylinder and blocking the fuel spray inside the cylinder during the normal operation of the engine.

[0006] According to an embodiment of the present utility model, there is provided a glow plug for an engine, including: a body; a heating part, one end of which is movably extended into the body, and is adapted to extend into the cylinder of the engine and ignite the fuel inside the cylinder in the case of cold start of the engine; and a driving part, installed inside the body and configured to drive the heating part to extend outwards from the body or contract towards the inside of the body, so that the heating part can extend into the cylinder or disengage from the cylinder.

[0007] According to an embodiment of the present utility model, the driving part includes: a receiving cavity, extending along the axial direction of the body, formed inside the body, and one end of the heating part is movably inserted into the inside of the receiving cavity; and a driving assembly, installed inside the receiving cavity, configured to drive the heating part to extend out of the receiving cavity or contract towards the inside of the receiving cavity.

[0008] According to an embodiment of the present utility model, the driving part further includes: a limiting member, formed at one end of the heating part inserted into the receiving cavity, configured to prevent the heating part from detaching from the receiving cavity when the heating part extends out of the receiving cavity.

[0009] According to an embodiment of the present utility model, the driving assembly includes: paraffin wax, disposed inside the receiving cavity; and a first heating element, installed inside the receiving cavity, suitable for heating the paraffin wax; wherein, when the first heating element is in a heating state, the paraffin wax expands, the pressure inside the receiving cavity increases, and the heating part is pushed to move out of the receiving cavity, so that the heating part extends out of the body; when the first heating element stops heating, the paraffin wax cools and contracts, the pressure inside the receiving cavity decreases, and under the action of atmospheric pressure, the heating part moves towards the inside of the receiving cavity, so that the heating part contracts towards the inside of the body.

[0010] According to an embodiment of the present utility model, the heating part is configured to be a substantially cylindrical body; the receiving cavity is configured to be an annular cavity formed inside the body along the circumferential direction.

[0011] According to an embodiment of the present utility model, an opening allowing the heating part to extend into is formed at one end of the receiving cavity close to the heating part; the limiting member is configured to be a substantially circular ring-shaped convex platform, and the cross-sectional area of the convex platform is larger than the area of the opening.

[0012] According to an embodiment of the present utility model, a chute allowing the heating part to extend into is formed inside the body along the axial direction.

[0013] According to an embodiment of the present utility model, the heating part includes: a housing; and a second heating element, installed inside the housing, suitable for igniting the fuel inside the cylinder.

[0014] According to an embodiment of the present utility model, a first heating electrode and a second heating electrode are respectively connected to the first heating element and the second heating element to respectively control the heating temperatures of the first heating element and the second heating element.

[0015] According to an embodiment of the present invention, an engine is provided, including: a cylinder; and a glow plug for the engine as described in the above embodiment, which is installed above the cylinder; wherein, in the case of cold start of the engine, the heating part of the glow plug extends into the cylinder to ignite the fuel inside the cylinder; in the case of normal operation of the engine, the heating part of the glow plug retracts outside the cylinder.

[0016] The glow plug for the engine according to the above embodiment of the present invention drives the heating part to extend outwards or retract inwards towards the inside of the body by installing a driving part inside the body. In the case of cold start of the engine, the heating part can extend into the cylinder to ignite the fuel inside the cylinder; in the case of normal operation of the engine, the heating part disengages from the cylinder to avoid the glow plug obstructing the air flow inside the cylinder and blocking the fuel spray into the cylinder. Description of the Drawings

[0017] Figure 1 is a cross-sectional view of the engine with the glow plug retracted outside the cylinder according to the embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of the engine with the glow plug extending into the cylinder according to the embodiment of the present invention;

[0019] Figure 3 is a cross-sectional view of the glow plug for the engine according to the embodiment of the present invention;

[0020] Figure 4 is an assembly schematic diagram between the body, the driving part and the heating part of the glow plug for the engine according to the embodiment of the present invention; and

[0021] Figure 5 is Figure 4 a cross-sectional view taken along the A-A direction.

[0022] In the figure:

[0023] 1 - body; 11 - chute;

[0024] 2 - heating part; 21 - housing; 22 - second heating element;

[0025] 3 - cylinder;

[0026] 4 - driving part;

[0027] 41 - accommodation cavity; 411 - opening;

[0028] 42 - driving assembly; 421 - paraffin wax; 422 - first heating element;

[0029] 43 - limiting part; 431 - boss. Detailed Implementation Modes

[0030] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0031] According to an inventive concept of one aspect of the present utility model, there is provided a glow plug for an engine, comprising: a body; a heating part, one end of which is movably inserted into the interior of the body and is adapted to be inserted into the interior of a cylinder of the engine to ignite the fuel inside the cylinder in the case of cold start of the engine; and a driving part, which is installed inside the body and is configured to drive the heating part to extend outward from the body or contract inward into the body, so that the heating part can be inserted into the cylinder or separated from the cylinder.

[0032] Figure 1 is a cross-sectional view of an engine in which the glow plug according to an embodiment of the present utility model is contracted outside the cylinder; Figure 2 is a cross-sectional view of an engine in which the glow plug according to an embodiment of the present utility model is inserted into the cylinder; Figure 3 is a cross-sectional view of the glow plug for an engine according to an embodiment of the present utility model.

[0033] According to an exemplary embodiment of the present utility model, please refer to Figures 1-3 , there is provided a glow plug for an engine, comprising a body 1, a heating part 2 and a driving part 4. One end of the heating part 2 is movably inserted into the interior of the body 1 and is adapted to be inserted into the interior of a cylinder 3 of the engine to ignite the fuel inside the cylinder 3 in the case of cold start of the engine. The driving part 4 is installed inside the body 1 and is configured to drive the heating part 2 to extend outward from the body 1 or contract inward into the body 1, so that the heating part 2 can be inserted into the cylinder 3 or separated from the cylinder 3.

[0034] In this embodiment, by installing the driving part 4 inside the body 1, the heating part 2 is driven to extend outward from the body 1 or contract inward into the body 1. In the case of cold start of the engine, the heating part 2 can be inserted into the cylinder 3 to ignite the fuel inside the cylinder 3; in the case of normal operation of the engine, the heating part 2 is separated from the cylinder 3 to avoid the glow plug from obstructing the air flow inside the cylinder 3 and blocking the fuel injection beam inside the cylinder 3.

[0035] Figure 4 is an assembly schematic diagram among the body, the driving part and the heating part of the glow plug for an engine according to an embodiment of the present utility model; Figure 5 is Figure 4 a cross-sectional view taken along the A-A direction.

[0036] In some exemplary embodiments, refer to Figures 3-5, the driving part 4 includes a receiving cavity 41 and a driving component 42. The receiving cavity 41 extends along the axial direction of the main body 1 and is formed inside the main body 1. One end of the heating part 2 is movably inserted into the receiving cavity 41. The driving component 42 is installed inside the receiving cavity 41 and is configured to drive the heating part 2 to extend outwards from the receiving cavity 41 or contract towards the inside of the receiving cavity 41.

[0037] Through the above setting method, in the case of cold starting of the engine, the driving component 42 drives the heating part 2 to extend outwards from the receiving cavity 41, so that the heating part 2 extends into the cylinder 3 and ignites the fuel inside the cylinder 3. In the case of normal operation of the engine, the driving component 42 drives the heating part 2 to contract towards the inside of the receiving cavity 41, so that the heating part 2 disengages from the cylinder 3, avoiding the preheating plug from hindering the air flow inside the cylinder 3 and blocking the fuel spray inside the cylinder 3.

[0038] In some exemplary embodiments, referring to Figures 3-5 , the driving part 4 further includes a limiting member 43. The limiting member 43 is formed at one end of the heating part 2 extending into the receiving cavity 41 and is configured to prevent the heating part 2 from disengaging from the receiving cavity 41 when the heating part 2 extends outwards from the receiving cavity 41.

[0039] Through the above setting method, it is prevented that during the process of the heating part 2 extending outwards from the receiving cavity 41, due to the driving force of the driving component 42 not being withdrawn in time or being too large, the heating part 2 disengages from the receiving cavity 41, causing the heating part 2 to disengage from the main body 1 and fall into the cylinder 3.

[0040] In some exemplary embodiments, referring to Figures 3-5 , the driving component 42 includes paraffin 421 and a first heating element 422. The paraffin 421 is arranged inside the receiving cavity 41. The first heating element 422 is installed inside the receiving cavity 41 and is suitable for heating the paraffin 421. Wherein, when the first heating element 422 is in the heating state, the paraffin 421 expands, the pressure inside the receiving cavity 41 increases, and the heating part 2 is pushed to move outwards from the receiving cavity 41, so that the heating part 2 extends outwards from the main body 1. When the first heating element 422 stops heating, the paraffin 421 cools and contracts, the pressure inside the receiving cavity 41 decreases, and under the action of the atmospheric pressure, the heating part 2 moves towards the inside of the receiving cavity 41, so that the heating part 2 contracts towards the inside of the main body 1.

[0041] In this embodiment, when the engine is cold-started, the first heating element 422 heats the paraffin 421. The paraffin 421 expands and squeezes the air inside the accommodation chamber 41. The pressure inside the accommodation chamber 41 increases, pushing the heating part 2 to move towards the outside of the accommodation chamber 41. The heating part 2 extends outwards from the main body 1 and extends into the cylinder 3 to ignite the fuel inside the cylinder 3. After the cold start of the engine is completed and the engine is in a normal operating state, the first heating element 422 stops heating. The paraffin 421 cools and contracts, and the space for accommodating air inside the accommodation chamber 41 increases. The pressure inside the accommodation chamber 41 decreases. Under the action of the atmospheric pressure, the heating part 2 moves towards the inside of the accommodation chamber 41, causing the heating part 2 to contract towards the inside of the main body 1 and disengage from the cylinder 3, avoiding the preheating plug from obstructing the air flow inside the cylinder 3 and blocking the fuel spray inside the cylinder 3.

[0042] It should be noted that in this embodiment, the accommodation chamber 41 is arranged at the intermediate position of the main body 1 extending in the axial direction, which is generally wrapped by the cooling water of the engine. The extension amount of the heating part 2 is limited by the heating temperature of the paraffin 421 and the limiting member 43. The extension amount of the heating part 2 is generally 3-5 mm.

[0043] In some exemplary embodiments, referring to Figures 3-5 , the heating part 2 is configured as a substantially cylindrical body. The accommodation chamber 41 is configured as an annular cavity formed inside the main body 1 in the circumferential direction.

[0044] It should be noted that in this embodiment, the end of the heating part 2 extending into the main body 1 is a hollow thin-walled cylinder.

[0045] In some exemplary embodiments, referring to Figures 3-5 , an opening 411 allowing the heating part 2 to extend into is formed at one end of the accommodation chamber 41 close to the heating part 2. The limiting member 43 is configured as a substantially circular ring-shaped boss 431, and the cross-sectional area of the boss 431 is larger than the area of the opening 411.

[0046] Through the above setting method, when the heating part 2 extends outwards to the maximum displacement amount towards the outside of the accommodation chamber 41, the boss 431 abuts against the position of the opening 411 of the accommodation chamber 41, preventing the heating part 2 from continuing to extend towards the outside of the accommodation chamber 41, and preventing the heating part 2 from disengaging from the accommodation chamber 41 and the main body 1 and falling into the cylinder 3 due to the driving force of the driving assembly 42 not being withdrawn in time or being too large.

[0047] It should be noted that in this embodiment, after the heating part 2 extends into the opening 411, the accommodation chamber 41 forms a sealed cavity.

[0048] In some exemplary embodiments, referring to Figures 3-5, a chute 11 extending in the axial direction is formed inside the body 1 to allow the heating part 2 to extend therein.

[0049] It should be noted that, in this embodiment, the chute 11 is a substantially circular ring-shaped groove extending in the axial direction of the body 1.

[0050] In some exemplary embodiments, referring to Figures 3-5 , the heating part 2 includes a housing 21 and a second heating element 22. The second heating element 22 is installed inside the housing 21 and is suitable for igniting the fuel inside the cylinder 3.

[0051] It should be noted that, in this embodiment, the heating temperature of the second heating element 22 reaches above 800 °C and is used to ignite the fuel inside the cylinder 3.

[0052] In some exemplary embodiments, a first heating electrode (not shown in the figure) and a second heating electrode (not shown in the figure) are respectively connected to the first heating element 422 and the second heating element 22 to respectively control the heating temperatures of the first heating element 422 and the second heating element 22.

[0053] In this embodiment, in the case of cold start of the engine, the first heating electrode is energized, so that the first heating element 422 heats up, heating the paraffin 421 inside the accommodation cavity 41. The paraffin 421 expands, squeezing the air inside the accommodation cavity 41. The pressure inside the accommodation cavity 41 increases, pushing the heating part 2 to move towards the outside of the accommodation cavity 41. The heating part 2 extends outwards from the body 1 and extends into the cylinder 3. At this time, the second heating electrode is energized, so that the second heating element 22 heats up to ignite the fuel inside the cylinder 3. After the cold start of the engine is completed and the engine is in a normal operating state, the first heating electrode and the second heating electrode are both de-energized, and the first heating element 422 and the second heating element 22 both stop heating. The paraffin 421 cools and contracts, and the space for accommodating air inside the accommodation cavity 41 increases. The pressure inside the accommodation cavity 41 decreases. Under the action of the atmospheric pressure, the heating part 2 moves towards the inside of the accommodation cavity 41, so that the heating part 2 contracts towards the inside of the body 1 and disengages from the cylinder 3.

[0054] It should be noted that, in this embodiment, the first heating element 422 and the second heating element 22 can be set as heating wires.

[0055] Furthermore, compared with the existing glow plugs for engines, the glow plugs for engines in this embodiment have the following advantages:

[0056] The running time of the engine in the cold start state is very short, and the engine is almost always in the normal running state. At this time, the existing glow plug becomes an extra structure inside the cylinder. In the case of cold starting of the engine, the glow plug of this embodiment extends into the inside of cylinder 3. In the case of the engine being in the normal running state, the glow plug contracts to the outside of cylinder 3.

[0057] In this way, the air flow movement inside cylinder 3 is not blocked by the heating part 2 of the glow plug, the air flow speed is faster, there is no flow disturbance from the heating part 2, and the flow is more stable. In this way, the mixture of fuel and air is more sufficient, and the combustion stability and combustion rate are better.

[0058] Furthermore, the fuel injection spray is not blocked by the heating part 2 of the glow plug, the spray diffuses more rapidly, and the distribution of the fuel injection spray inside cylinder 3 is made more uniform, improving the uneven situation of the fuel-air mixture.

[0059] The above two points will both make the engine combustion more stable and the combustion efficiency higher. The direct benefits reflected in the engine indicators are: reduced fuel consumption, increased power and torque, and reduced engine emission pollutants, among which the reduction of particulate matter is obvious.

[0060] In addition, in this embodiment, the driving component 42 can also adopt a screw structure and be connected to one end of the heating part 2 extending into the accommodating cavity 41 to drive the heating part 2 to extend outwards towards the outside of the accommodating cavity 41 or contract inwards towards the inside of the accommodating cavity 41.

[0061] According to an exemplary embodiment of the present invention, please refer to Figures 1-2 , there is provided an engine, including a cylinder 3 and the glow plug for the engine described in the above embodiment. The glow plug is installed above the cylinder 3. Among them, in the case of cold starting of the engine, the heating part 2 of the glow plug extends into the inside of cylinder 3 to ignite the fuel inside cylinder 3. In the case of the engine being in the normal running state, the heating part 2 of the glow plug contracts to the outside of cylinder 3.

[0062] Through the above setting method, on the one hand, in the case of cold starting of the engine, the heating part 2 of the glow plug can extend into the inside of cylinder 3 to ignite the fuel inside cylinder 3; on the other hand, in the case of the engine being in the normal running state, the heating part 2 of the glow plug contracts to the outside of cylinder 3 to avoid the glow plug from hindering the air flow inside cylinder 3 and blocking the fuel injection spray inside cylinder 3.

[0063] The specific embodiments described above have further detailed the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A glow plug for an engine, characterized in that: include: Ontology(1); A heating part (2) has one end movably extending into the body (1) and is suitable for extending into the cylinder (3) of the engine to ignite the fuel in the cylinder (3) when the engine is cold started; as well as The driving part (4) is installed inside the body (1) and is configured to drive the heating part (2) to extend toward the outside of the body (1) or to retract toward the inside of the body (1), so that the heating part (2) can extend into the cylinder (3) or be separated from the cylinder (3).

2. The glow plug for an engine according to claim 1, characterized in that: The driving unit (4) comprises: A containing cavity (41) extends along the axial direction of the body (1) and is formed inside the body (1), and one end of the heating portion (2) is movably extended into the containing cavity (41); and A driving assembly (42) is installed inside the accommodating cavity (41) and is configured to drive the heating portion (2) to extend toward the outside of the accommodating cavity (41) or to retract toward the inside of the accommodating cavity (41).

3. The glow plug for an engine according to claim 2, characterized in that: The driving unit (4) further comprises: A stopper (43) is formed at one end of the heating portion (2) extending into the accommodating cavity (41), and is configured to prevent the heating portion (2) from escaping from the accommodating cavity (41) when the heating portion (2) extends toward the outside of the accommodating cavity (41).

4. The glow plug for an engine according to claim 2, characterized in that: The drive assembly (42) comprises: Paraffin (421), arranged inside the accommodating cavity (41); and A first heating element (422), installed inside the accommodating cavity (41), and adapted to heat the paraffin (421); In which, when the first heating element (422) is in a heating state, the paraffin (421) expands, the pressure inside the accommodating cavity (41) increases, and the heating part (2) is pushed to move toward the outside of the accommodating cavity (41), so that the heating part (2) extends toward the outside of the main body (1); when the first heating element (422) stops heating, the paraffin (421) cools down and shrinks, the pressure inside the accommodating cavity (41) decreases, and under the action of atmospheric pressure, the heating part (2) moves toward the inside of the accommodating cavity (41), so that the heating part (2) shrinks toward the inside of the main body (1).

5. The glow plug for an engine according to claim 3, characterized in that: The heating part (2) is configured as a substantially cylindrical body; The accommodating cavity (41) is configured as an annular cavity formed inside the body (1) along a circumferential direction.

6. The glow plug for an engine according to claim 5, characterized in that: An opening (411) is formed at one end of the accommodating cavity (41) close to the heating portion (2) to allow the heating portion (2) to extend therein; The limiting member (43) is configured as a substantially annular boss (431), and the cross-sectional area of ​​the boss (431) is larger than the area of ​​the opening (411).

7. A glow plug for an engine according to any one of claims 1 to 6, characterized in that: A sliding groove (11) extending in the axial direction and allowing the heating part (2) to extend therein is formed inside the body (1).

8. The glow plug for an engine according to claim 4, characterized in that: The heating unit (2) comprises: a housing (21); and The second heating element (22) is installed inside the housing (21) and is suitable for igniting the fuel inside the cylinder (3).

9. The glow plug for an engine according to claim 8, characterized in that: The first heating element (422) and the second heating element (22) are respectively connected to a first heating electrode and a second heating electrode to respectively control the heating temperatures of the first heating element (422) and the second heating element (22).

10. An engine, characterized in that: include: Cylinder (3); as well as The glow plug for an engine according to any one of claims 1 to 9, mounted above the cylinder (3); Wherein, when the engine is cold started, the heating portion (2) of the glow plug extends into the interior of the cylinder (3) to ignite the fuel inside the cylinder (3); when the engine is running normally, the heating portion (2) of the glow plug shrinks to the outside of the cylinder (3).

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