Cold start auxiliary device for methanol dual-fuel engine

Abstract

The invention discloses a cold start auxiliary device for a methanol dual-fuel engine in the technical field of engines, which comprises a nozzle heat assembly wrapped on an external pipeline of a methanol nozzle and a diesel nozzle and a cylinder heat assembly wrapped on a cylinder, the nozzle heat assembly comprises an energy storage sleeve body, a plurality of extrusion units evenly distributed on the periphery of the energy storage sleeve body in the circumferential direction and a first gear ring used for driving the extrusion units to reciprocate. The extrusion units are used for inwards extruding the energy storage sleeve body to release heat stored in the energy storage sleeve body. The air cylinder heat assembly comprises a barrel, a plurality of heating units arranged on the inner side face of the barrel and a driving unit, and the driving unit is used for driving the barrel to rotate around the air cylinder in a reciprocating mode so that the heating units can evenly heat the surface of the air cylinder. The device can effectively preheat the methanol nozzle, the diesel nozzle and the surrounding area of the air cylinder at the same time, the temperature of key components is rapidly increased in the cold starting stage, atomization and combustion of methanol fuel are promoted, the low-temperature starting performance is remarkably improved, and emission is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to a cold start assist device for a methanol dual-fuel engine. Background Art

[0002] A methanol dual-fuel engine is an engine that can use methanol and another fuel (usually diesel or gasoline) as a power source. Due to the physical and chemical properties of methanol, such as its relatively high latent heat of vaporization and low flame temperature, methanol faces some challenges during cold start. To overcome these problems, some auxiliary devices are usually adopted to assist cold start.

[0003] Some existing cold start devices mostly only heat a certain local area (such as the fuel injector or the intake duct), making it difficult to achieve coordinated preheating of multiple key parts such as the methanol nozzle, diesel nozzle, and cylinder, and the overall thermal management effect is not good; and generally it is a fixed heating structure, which cannot adapt to the problem of uneven temperature distribution on the cylinder surface, easily causing local overheating or low heating efficiency, and affecting the running stability of the engine.

[0004] Therefore, a cold start assist device for a methanol dual-fuel engine is provided to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a cold start assist device for a methanol dual-fuel engine, which solves the problem that most existing cold start devices only heat a certain local area, and the overall thermal management effect is not good.

[0006] The present invention achieves the above purpose through the following technical solutions: A cold start assist device for a methanol dual-fuel engine includes a nozzle heat assembly wrapped around the outer pipes of the methanol nozzle and the diesel nozzle, and a cylinder heat assembly wrapped around the cylinder. The nozzle heat assembly includes a storage sleeve body, a plurality of extrusion units evenly distributed around the storage sleeve body in a circumferential direction, and a first gear ring for driving the extrusion units to reciprocate. The extrusion units are used to squeeze the storage sleeve body inward to release the heat stored therein; the cylinder heat assembly includes a cylinder body, a plurality of heating units arranged on the inner side surface of the cylinder body, and a driving unit. The driving unit is used to drive the cylinder body to rotate around the cylinder reciprocally, so that the heating units uniformly heat the surface of the cylinder.

[0007] As a further optimized solution of the present invention, a plurality of heat conducting sheets evenly distributed in a circumferential direction are provided on the bottom surface and the inner surface of the storage sleeve body.

[0008] As a further optimized solution of the present invention, the extrusion unit includes a fixed seat fixed on the cylinder head and a movable rod movably penetrating through the fixed seat. One end of the movable rod is fixedly provided with an extrusion block, and the other end is fixedly provided with a second wedge block. A first spring is sleeved on the movable rod between the extrusion block and the fixed seat.

[0009] As a further optimized solution of the present invention, a support frame is provided below the first toothed ring. The support frame is fixedly installed on the cylinder head and is used to support the first toothed ring to achieve rotational movement; a plurality of first wedge blocks cooperating with the second wedge block are fixedly provided on the first toothed ring, and the number of the first wedge blocks is half of the number of the second wedge blocks.

[0010] As a further optimized solution of the present invention, the driving unit includes a motor, an incomplete gear fixed on the output shaft of the motor, and a mounting bracket for fixing the motor. A second toothed ring meshing with the incomplete gear is fixedly sleeved on the outer periphery of the cylinder body.

[0011] As a further optimized solution of the present invention, a third toothed ring is provided above the cylinder body. A connecting plate is fixedly provided between the third toothed ring and the cylinder body; the third toothed ring meshes with the first toothed ring.

[0012] As a further optimized solution of the present invention, the heating unit includes an arc-shaped substrate and a functional coating film fixed on the arc-shaped substrate.

[0013] As a further optimized solution of the present invention, the cylinder heat assembly further includes a telescopic adjustment unit for driving the heating unit to fit or leave the surface of the cylinder. The telescopic adjustment unit includes an airbag and a ring tube sleeved on the cylinder body; guide rods are fixedly provided at both ends of the arc-shaped substrate, and the guide rods movably penetrate through the cylinder body. A piston cylinder fixed on the cylinder body is provided at the middle part of the arc-shaped substrate, and the movable end of the piston cylinder is fixedly connected to the arc-shaped substrate; the piston cylinder, the ring tube, and the airbag communicate with each other.

[0014] As a further optimized solution of the present invention, a semi-cylindrical tube is fixedly provided at the top of the mounting bracket. The airbag is embedded in the groove of the semi-cylindrical tube, and first magnetic attraction plates are fixedly provided at both ends of the airbag; a fixed bracket is fixedly provided at the top of the incomplete gear, and second magnetic attraction plates cooperating with the first magnetic attraction plates are fixedly provided at both ends of the fixed bracket; two limit columns are also fixedly provided at the top of the mounting bracket; a first support plate is fixedly provided on the semi-cylindrical tube, and a second support plate is fixedly provided on the airbag. A second spring is provided between the second support plate and the first support plate.

[0015] As a further optimized solution of the present invention, the cylinder heat assembly further includes a plurality of cooling units disposed on the inner side surface of the cylinder body, and the cooling units and the heating units are distributed alternately; the structures of the cooling units and the heating units are the same, and both are attached to or separated from the cylinder through the telescopic adjustment unit The beneficial effects of the present invention are as follows: 1. The present invention can effectively preheat the methanol nozzle, diesel nozzle and the area around the cylinder at the same time, rapidly increase the temperature of key components in the cold start stage, promote the atomization and combustion of methanol fuel, significantly improve the low-temperature start performance, reduce emissions, store the waste heat of the engine by using phase change materials, and release it during cold start to achieve energy recovery and reuse.

[0016] 2. The driving unit of the present invention can drive the cylinder body to rotate reciprocally to uniformly heat and cool the surface of the cylinder, and through the linkage of the third gear ring and the first gear ring, synchronously control the extrusion unit in the nozzle heat assembly, coordinate the heating and energy storage release processes, and improve the integration and automation level.

[0017] 3. The present invention realizes the controllable attachment and separation of the heating unit through the telescopic adjustment unit. On the one hand, it avoids the heating unit from wearing the surface of the cylinder during the rotation of the cylinder body. On the other hand, after the cylinder body stops rotating, the heating unit can tightly contact the cylinder body to enhance the heat conduction efficiency and improve the heating effect. Description of the Drawings

[0018] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 It is a top view of the overall structure of the nozzle heat assembly of the present invention; Figure 3 It is of the present invention Figure 3 The enlarged schematic diagram of the structure at A in Figure 4 It is a schematic diagram of the structure of the energy storage sleeve body of the present invention; Figure 5 It is a schematic diagram of the overall structure of the cylinder heat assembly of the present invention; Figure 6 It is a schematic diagram of the structure of the heating unit of the present invention; Figure 7 It is a schematic diagram of the structures of the driving unit and the telescopic adjustment unit of the present invention; Figure 8 It is a schematic diagram of the connection structure between the telescopic adjustment unit and the heating unit of the present invention.

[0019] In the figure: 1. Nozzle thermal component; 101. Energy storage sleeve body; 102. Heat conducting sheet; 103. Extrusion unit; 103a. Fixed seat; 103b. Movable rod; 103c. Extrusion block; 103d. First spring; 103e. Second wedge block; 104. First gear ring; 105. Support frame; 106. First wedge block; 2. Cylinder thermal component; 201. Cylinder body; 202. Heating unit; 202a. Arc-shaped substrate; 202b. Functional coating film; 202c. Guide rod; 202d. Piston cylinder; 203. Cooling unit; 204. Second gear ring; 205. Driving unit; 205a. Incomplete gear; 205b. Motor; 205c. Mounting frame; 205d. Semi-cylindrical tube; 205e. Fixed frame; 205f. Second magnetic attraction plate; 205g. Limit post; 205h. First support plate; 206. Third gear ring; 207. Connecting plate; 208. Telescopic adjustment unit; 208a. Airbag; 208b. First magnetic attraction plate; 208c. Second support plate; 208d. Second spring; 208e. Annular tube; 3. Methanol nozzle; 4. Diesel nozzle; 5. Cylinder head; 6. Cylinder. Detailed implementation mode

[0020] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following specific implementation modes are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0021] Embodiment 1 To solve the problem that the existing cold start devices mostly only heat a certain local area, it is difficult to achieve the coordinated preheating of multiple key parts such as the methanol nozzle 3, the diesel nozzle 4 and the cylinder 6, and the overall thermal management effect is not good. Please refer to Figure 1 - Figure 2 、 Figure 4 - Figure 5, a cold start assist device for a methanol dual-fuel engine provided by the present invention includes a nozzle heat assembly 1 wrapped around the outer pipes of a methanol nozzle 3 and a diesel nozzle 4, and a cylinder heat assembly 2 wrapped around a cylinder 6. The nozzle heat assembly 1 includes a heat storage sleeve body 101, a plurality of extrusion units 103 evenly distributed around the heat storage sleeve body 101 in a circumferential direction, and a first gear ring 104 for driving the extrusion units 103 to reciprocate. The heat storage sleeve body 101 is composed of a high latent heat value phase change material encapsulated in a flexible outer shell. The flexible outer shell is made of a material resistant to high temperatures and having good thermal conductivity, which is used to store the waste heat during the operation of the engine and release heat during cold start. A plurality of heat conducting fins 102 evenly distributed in a circumferential direction are provided on the bottom surface and the inner surface of the heat storage sleeve body 101, which are used to enhance the heat conduction efficiency between the heat storage sleeve body 101 and the nozzle outer pipe and the cylinder head 5. The extrusion units 103 are used to squeeze the heat storage sleeve body 101 inward to release the heat stored therein, and generally 6-8 are used to ensure uniform force. The cylinder heat assembly 2 includes a cylinder body 201, a plurality of heating units 202 provided on the inner side surface of the cylinder body 201, and a driving unit 205. The driving unit 205 is used to drive the cylinder body 201 to reciprocally rotate around the cylinder 6, so that the heating units 202 uniformly heat the surface of the cylinder 6.

[0022] As Figure 2 shown, the extrusion unit 103 includes a fixed seat 103a fixed on the cylinder head 5 and a movable rod 103b movably penetrating through the fixed seat 103a. One end of the movable rod 103b is fixedly provided with an extrusion block 103c, and the other end is fixedly provided with a second wedge block 103e. A first spring 103d is sleeved on the movable rod 103b between the extrusion block 103c and the fixed seat 103a, which is used to provide a restoring force to make the extrusion block 103c disengage from the surface of the heat storage sleeve body 101.

[0023] A support frame 105 is provided below the first gear ring 104. The support frame 105 is fixedly installed on the cylinder head 5 and is used to support the first gear ring 104 to achieve rotational movement. A plurality of first wedge blocks 106 cooperating with the second wedge blocks 103e are fixedly provided on the first gear ring 104. The number of the first wedge blocks 106 is half of the number of the second wedge blocks 103e, so that the adjacent extrusion units 103 are alternately actuated under driving, realizing staggered extrusion of the heat storage sleeve body 101, and improving the uniformity and efficiency of heat release.

[0024] When the first gear ring 104 runs, it drives the first wedge block 106 thereon to gradually approach and press the second wedge block 103e in the pressing unit 103. When the two wedge surfaces come into contact, under the action of the continuous rotation of the first gear ring 104, the second wedge block 103e is pushed to move radially inwards, driving the movable rod 103b to move inwards. The movable rod 103b drives the pressing block 103c to move towards the energy storage sleeve 101, applying pressure. Under the action of mechanical pressure, the energy storage sleeve 101 releases heat. As the first gear ring 104 continues to rotate, the first wedge block 106 disengages from the contact with the second wedge block 103e. Under the action of the first spring 103d, the movable rod 103b retracts, driving the pressing block 103c away from the surface of the energy storage sleeve 101.

[0025] As Figure 5 shown, the driving unit 205 includes a motor 205b, an incomplete gear 205a fixed on the output shaft of the motor 205b, and a mounting bracket 205c for fixing the motor 205b. A second gear ring 204 meshing with the incomplete gear 205a is fixedly sleeved on the outer periphery of the cylinder body 201; a third gear ring 206 is provided above the cylinder body 201, and a connecting plate 207 is fixedly provided between the third gear ring 206 and the cylinder body 201; the third gear ring 206 meshes with the first gear ring 104, and among them, the motor 205b is set as a forward and reverse motor.

[0026] As Figure 6 shown, the heating unit 202 includes an arc-shaped substrate 202a and a functional coating film 202b fixed on the arc-shaped substrate 202a. The functional coating film 202b adopts a flexible infrared heating film and is in close contact with the surface of the cylinder 6 during use. The cylinder thermal assembly 2 further includes a plurality of cooling units 203 provided on the inner side surface of the cylinder body 201, and the cooling units 203 and the heating unit 202 are distributed alternately; the structure of the cooling unit 203 is the same as that of the heating unit 202.

[0027] During use, the driving motor 205b is driven, the motor 205b drives the incomplete gear 205a to rotate, the incomplete gear 205a drives the second gear ring 204 to rotate, and the second gear ring 204 drives the cylinder body 201 to rotate, realizing uniform heating of the surface of the cylinder 6. During the rotation of the cylinder body 201, the third gear ring 206 fixed on the cylinder body 201 rotates synchronously with the cylinder body 201, and the third gear ring 206 transmits the rotational motion to the first gear ring 104, thereby driving a plurality of pressing units 103 to periodically perform pressing operations on the energy storage sleeve 101 to release the heat in the energy storage sleeve 101 and heat the methanol nozzle 3 and the diesel nozzle 4; at the same time, the areas around the methanol nozzle 3, the diesel nozzle 4, and the cylinder 6 are effectively preheated, quickly raising the temperature of key components during the cold start phase, promoting the atomization and combustion of methanol fuel, significantly improving the low-temperature starting performance, and reducing emissions.

[0028] Embodiment 2 On the basis of the first embodiment, in order to achieve the controllable fitting and separation of the heating unit 202 and avoid the problem that the heating unit 202 wears the surface of the cylinder 6 during the rotation of the cylinder body 201, such as Figure 5 - Figure 6 、 Figure 8 shown, the cylinder thermal assembly 2 further includes a telescopic adjustment unit 208 for driving the heating unit 202 to fit or leave the surface of the cylinder 6. The telescopic adjustment unit 208 includes an airbag 208a and a ring pipe 208e sleeved on the cylinder body 201; guide rods 202c are fixedly provided at both ends of the arc-shaped substrate 202a, the guide rods 202c movably penetrate the cylinder body 201, and a piston cylinder 202d fixed on the cylinder body 201 is provided at the middle part of the arc-shaped substrate 202a. The movable end of the piston cylinder 202d is fixedly connected to the arc-shaped substrate 202a; the piston cylinder 202d, the ring pipe 208e and the airbag 208a communicate with each other.

[0029] During use, when the airbag 208a is stretched, the medium in the ring pipe 208e is sucked into the airbag 208a, the piston cylinder 202d retracts, and the arc-shaped substrate 202a drives the functional coating film 202b to separate from the surface of the cylinder 6. At this time, the cylinder body 201 can rotate freely back and forth, avoiding friction between the heating unit 202 and the surface of the cylinder 6. When the airbag 208a is compressed, the internal pressure pushes the piston cylinder 202d to extend, driving the functional coating film 202b to fit the surface of the cylinder 6.

[0030] Embodiment Three On the basis of the first and second embodiments, in order to achieve the automatic operation of the heating unit 202, such as Figure 7 shown, a semi-cylindrical tube 205d is fixedly provided at the top of the mounting frame 205c. The airbag 208a is embedded in the groove of the semi-cylindrical tube 205d, and first magnetic attraction plates 208b are fixedly provided at both ends of the airbag 208a; a fixed frame 205e is fixedly provided at the top of the incomplete gear 205a, and second magnetic attraction plates 205f matching the first magnetic attraction plates 208b are fixedly provided at both ends of the fixed frame 205e; two limiting columns 205g are also fixedly provided at the top of the mounting frame 205c for limiting the moving range of the airbag 208a; a first support plate 205h is fixedly provided on the semi-cylindrical tube 205d, and a second support plate 208c is fixedly provided on the airbag 208a. A second spring 208d is provided between the second support plate 208c and the first support plate 205h for providing a restoring force for the airbag 208a.

[0031] When the cylinder body 201 needs to rotate, the driving motor 205b is started, driving the incomplete gear 205a to slowly rotate. The incomplete gear 205a drives the fixing frame 205e and the second magnetic attraction plate 205f thereon to move, and uses the magnetic attraction force to pull the first magnetic attraction plate 208b, thereby realizing the stretching action of the airbag 208a. The second spring 208d is stretched, and the heating unit 202 is separated from the surface of the cylinder 6. As the incomplete gear 205a continues to rotate, when the serrated portion of the incomplete gear 205a contacts the second toothed ring 204, it drives the cylinder body 201 to rotate. When the cylinder body 201 rotates to the required position, under the action of the limit post 205g, the first magnetic attraction plate 208b is separated from the second magnetic attraction plate 205f. Under the restoring force of the second spring 208d, the airbag 208a resets, driving the piston cylinder 202d to extend, and further driving the heating unit 202 to fit the surface of the cylinder 6; thus realizing the automatic operation of the fitting and separation of the heating unit 202. On the one hand, it avoids the wear of the surface of the cylinder 6 by the heating unit 202 during the rotation of the cylinder body 201. On the other hand, after the cylinder body 201 stops rotating, the heating unit 202 can be in close contact with the cylinder body 201, improving the heating effect.

[0032] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A cold start auxiliary device for a methanol dual-fuel engine, comprising a nozzle heat assembly (1) wrapped around the outer pipes of a methanol nozzle (3) and a diesel nozzle (4), and a cylinder heat assembly (2) wrapped around a cylinder (6), characterized in that: The nozzle heat assembly (1) includes a heat storage sleeve body (101), a plurality of extrusion units (103) evenly distributed around the heat storage sleeve body (101) in a circumferential direction, and a first gear ring (104) for driving the extrusion units (103) to reciprocate. The extrusion units (103) are used to inwardly extrude the heat storage sleeve body (101) to release the heat stored therein. The cylinder heat assembly (2) includes a cylinder body (201), a plurality of heating units (202) provided on the inner side surface of the cylinder body (201), and a driving unit (205). The driving unit (205) is used to drive the cylinder body (201) to reciprocally rotate around the cylinder (6) so that the heating units (202) uniformly heat the surface of the cylinder (6).

2. The cold start assist device for a methanol dual fuel engine according to claim 1, characterized in that A plurality of heat conducting fins (102) evenly distributed in a circumferential direction are provided on the bottom surface and the inner surface of the heat storage sleeve body (101).

3. The cold start assist device for a methanol dual-fuel engine according to claim 1, characterized in that, The extrusion unit (103) includes a fixed seat (103a) fixed on the cylinder head (5) and a movable rod (103b) movably penetrating through the fixed seat (103a). One end of the movable rod (103b) is fixedly provided with an extrusion block (103c), and the other end is fixedly provided with a second wedge block (103e). A first spring (103d) is sleeved on the movable rod (103b) between the extrusion block (103c) and the fixed seat (103a).

4. The cold start assist device for a methanol dual-fuel engine according to claim 3, characterized in that, A support frame (105) is provided below the first gear ring (104). The support frame (105) is fixedly installed on the cylinder head (5) and is used to support the first gear ring (104) to achieve rotational movement. A plurality of first wedge blocks (106) mating with the second wedge blocks (103e) are fixedly provided on the first gear ring (104). The number of the first wedge blocks (106) is half of the number of the second wedge blocks (103e).

5. The cold start assist device for a methanol dual fuel engine according to claim 1, characterized in that, The driving unit (205) includes a motor (205b), an incomplete gear (205a) fixed on the output shaft of the motor (205b), and a mounting frame (205c) for fixing the motor (205b). A second gear ring (204) meshing with the incomplete gear (205a) is fixedly sleeved on the outer periphery of the cylinder body (201).

6. The cold start assist device for a methanol dual-fuel engine according to claim 1, characterized in that, A third gear ring (206) is provided above the cylinder body (201). A connecting plate (207) is fixedly provided between the third gear ring (206) and the cylinder body (201). The third gear ring (206) meshes with the first gear ring (104).

7. The cold start auxiliary device for a methanol dual-fuel engine according to claim 5, characterized in that, The heating unit (202) includes an arc-shaped substrate (202a) and a functional coating film (202b) fixed on the arc-shaped substrate (202a).

8. The cold start assist device for a methanol dual-fuel engine according to claim 7, characterized in that, The cylinder heat assembly (2) further includes a telescopic adjustment unit (208) for driving the heating unit (202) to fit or leave the surface of the cylinder (6). The telescopic adjustment unit (208) includes an airbag (208a) and a ring pipe (208e) sleeved on the cylinder body (201). Both ends of the arc-shaped substrate (202a) are fixedly provided with guide rods (202c), the guide rods (202c) movably penetrate through the cylinder body (201), a piston cylinder (202d) fixed on the cylinder body (201) is arranged at the middle part of the arc-shaped substrate (202a), and the movable end of the piston cylinder (202d) is fixedly connected with the arc-shaped substrate (202a); The piston cylinder (202d), the annular pipe (208e) and the airbag (208a) are communicated with each other.

9. The cold start assist device for a methanol dual-fuel engine according to claim 8, characterized in that, A semi-cylindrical barrel (205d) is fixedly arranged at the top of the mounting bracket (205c), the airbag (208a) is embedded in the groove of the semi-cylindrical barrel (205d), and first magnetic attraction plates (208b) are fixedly arranged at both ends of the airbag (208a); A fixing bracket (205e) is fixedly arranged at the top of the incomplete gear (205a), and second magnetic attraction plates (205f) matched with the first magnetic attraction plates (208b) are fixedly arranged at both ends of the fixing bracket (205e); Two limiting columns (205g) are further fixedly arranged at the top of the mounting bracket (205c); A first support plate (205h) is fixedly arranged on the semi-cylindrical barrel (205d), a second support plate (208c) is fixedly arranged on the airbag (208a), and a second spring (208d) is arranged between the second support plate (208c) and the first support plate (205h).

10. The cold start auxiliary device for a methanol dual-fuel engine according to claim 9, characterized in that, The cylinder heat assembly (2) further includes a plurality of cooling units (203) arranged on the inner side surface of the cylinder body (201), and the cooling units (203) and the heating units (202) are distributed alternately; The structure of the cooling unit (203) is the same as that of the heating unit (202), and both realize fitting or separating from the cylinder (6) through the telescopic adjusting unit (208).

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