Diesel injector cooling unit

Abstract

The invention discloses a diesel injector cooling unit in the technical field of diesel engines, and the diesel injector cooling unit comprises a plurality of cooling parts uniformly distributed around an oil nozzle body in the circumferential direction, and each cooling part comprises a bag body, a liquid spraying pipe communicated with the bag body and an extrusion part used for extruding the bag body to perform pulse type impact on the oil nozzle body by cooling liquid; the oil nozzle body is obliquely arranged and rotationally installed on the air cylinder cover, a cooling groove is formed in the air cylinder cover, and the cooling component is arranged on the inner wall of the peripheral side of the cooling groove. A driving mechanism is further arranged in the cooling groove and used for driving the oil nozzle body to rotate so as to achieve multi-direction oil injection. According to the device, rotation control of the oil nozzle body and a cooling system are highly integrated, an integrated unit of rotary oil injection and pulse impact cooling is formed, the oil injection performance is improved, cooling liquid is periodically compressed and injected through the bag body, the surface of the oil nozzle body is impacted in a pulse mode, and strong local convection heat exchange is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel engines, and in particular to a diesel engine fuel injector cooling unit. Background Art

[0002] In modern diesel engines, the injector is a core component of the fuel supply system, and its performance directly impacts combustion efficiency, emissions, and engine reliability. With the widespread adoption of high-pressure common rail technology, injection pressures continue to rise. The high-frequency injection process exposes the injector nozzle to intense thermal loads and mechanical shock, leading to localized temperature increases and potentially causing carbon deposits, wear, and even failure.

[0003] Existing injector cooling units are generally static cooling or continuous spraying. Static cooling is to set up a cooling cavity or cooling channel to remove heat through coolant circulation. The cooling efficiency is low and it is difficult to respond quickly. Continuous spraying is to use a cooling pump to continuously spray coolant onto the surface of the injector nozzle. It requires a large coolant flow rate, high energy consumption and low utilization rate, which is not conducive to energy saving and consumption reduction. In addition, most existing injectors are fixed in design, with a single injection direction and uneven fuel distribution, which affects combustion efficiency and emission control.

[0004] Therefore, a diesel engine injector cooling unit is provided to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a diesel engine injector cooling unit, which solves the problems of low cooling efficiency, large coolant usage and high energy consumption of existing static cooling or continuous spray cooling units.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions: A diesel engine injector cooling unit comprises a plurality of cooling components uniformly distributed circumferentially around a fuel injector body, the cooling components comprising a bladder, a liquid spraying pipe connected to the bladder, and an extrusion member for squeezing the bladder to pulse-impact the coolant on the fuel injector body; the fuel injector body is tilted and rotatably mounted on a cylinder head, a cooling groove is provided on the cylinder head, and the cooling components are arranged on the circumferential inner wall of the cooling groove; a driving mechanism is also provided in the cooling groove, the driving mechanism is used to drive the fuel injector body to rotate to achieve multi-directional fuel injection, and synchronously drive the extrusion members in each cooling component to periodically compress the corresponding bladder to achieve pulse cooling of the fuel injector body.

[0007] As a further optimization solution of the present invention, the liquid spray pipe is vertically arranged on one side of the sac body, and a plurality of branches are equidistantly arranged on the liquid spray pipe along the axial direction. A nozzle is provided at the end of the branch, and the nozzle is arranged toward the surface of the nozzle body.

[0008] As a further optimization scheme of the present invention, the extrusion member includes a fixed seat and a movable rod movably arranged in the fixed seat; an extrusion plate is fixedly arranged at one end of the movable rod close to the sac body, and a first wedge block is fixed at the other end; a spring is sleeved on the movable rod between the extrusion plate and the fixed seat.

[0009] As a further optimization solution of the present invention, a rotating cylinder is mounted on the injector body, a fixed sleeve is coaxially mounted outside the rotating cylinder, the fixed sleeve is rotationally connected to the rotating cylinder, and the fixed sleeve passes through and is fixed in the cylinder head.

[0010] As a further optimization scheme of the present invention, the driving mechanism includes a ring gear, a gear meshing with the ring gear, and a first motor for driving the gear to rotate; the ring gear is fixedly mounted on the rotating cylinder through a bracket, and a second wedge block is provided on the top of the ring gear to cooperate with the first wedge block; the second wedge block is located below the inclination direction of the injector body.

[0011] As a further optimization scheme of the present invention, the cooling unit also includes a liquid supply component for providing coolant to each bladder; the liquid supply component includes a liquid storage ring fixed in the cylinder head, and the liquid storage ring is provided with a plurality of liquid supply pipes corresponding to each bladder one by one, and the liquid supply pipe is provided with a one-way valve, and the liquid storage ring is also provided with a liquid supply pump for transporting the coolant to the bladder.

[0012] As a further optimized solution of the present invention, a drain pipe connected to the cooling groove is provided on the side of the cylinder head.

[0013] As a further optimization solution of the present invention, the cooling tank is provided with a cover for sealing the space thereof, and the cover is provided with an air cooling component; the air cooling component includes an air inlet pipe and an air outlet pipe.

[0014] As a further optimization scheme of the present invention, the injector body is also provided with a rotation component, which includes a reflection plate fixed on one side of the inner wall of the cover, a sensor fixed on one side of the outer end of the injector body, a second motor fixed on the rotating cylinder, and a controller; the second motor is used to drive the injector body to rotate so that the sensor is always facing the reflection plate, ensuring that each surface of the injector body can be impacted by the coolant during the revolution around the center.

[0015] As a further optimization scheme of the present invention, the fuel injector body is rotatably connected to the rotating cylinder; the outer end of the fuel injector body is provided with a first fuel injection pipe and a second fuel injection pipe, a first rotary joint is provided between the fuel injector body and the first fuel injection pipe, and a second rotary joint is provided between the first fuel injection pipe and the second fuel injection pipe.

[0016] The beneficial effects of the present invention are: 1. The present invention drives the injector body to rotate slowly through a driving mechanism, continuously changing the injection angle to achieve multi-directional injection, which can cover a wider combustion chamber area, make the fuel more evenly distributed in the combustion chamber, enhance the air mixing effect, improve combustion efficiency and reduce emissions.

[0017] 2. The present invention highly integrates the rotation control of the injector body with the cooling system to form an integrated unit of rotary injection and pulse impact cooling, which not only improves the injection performance, but also reduces additional energy consumption through mechanical linkage, thereby improving the overall efficiency of the system. The cooling component periodically compresses and sprays coolant through the capsule, impacting the surface of the injector body in a pulsed manner, breaking the thermal boundary layer in traditional continuous cooling, forming strong local convection heat transfer, and greatly improving the heat transfer coefficient. Moreover, since pulse cooling has a higher heat transfer efficiency, it can achieve the same or even better cooling effect at a lower coolant flow rate, thereby reducing the amount of coolant used. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional schematic diagram of the overall structure of the present invention Figure 1 ; Figure 2 A three-dimensional schematic diagram of the overall structure of the present invention Figure 2 ; Figure 3 This is a schematic diagram of the assembly structure of the cooling component, the fuel injector body, the driving mechanism and the liquid supply component of the present invention; Figure 4 It is a schematic structural diagram of the cooling component of the present invention; Figure 5 Schematic diagram of the driving mechanism structure of the present invention; Figure 6 It is a structural schematic diagram of the liquid supply component of the present invention; Figure 7 It is a schematic structural diagram of the cover body and the fuel injector body of the present invention.

[0019] In the picture: 1. Cooling component; 101. Bladder; 102. Liquid injection pipe; 103. Branch pipe; 104. Extrusion member; 104a. Fixing seat; 104b. Movable rod; 104c. Extrusion plate; 104d. First wedge block; 104e. Spring; 2. Injector nozzle body; 201. Rotating cylinder; 202. Fixed sleeve; 203. Second motor; 204. First injection pipe; 205. Second injection pipe; 206. First rotary joint; 207 , second rotary joint; 208, sensor; 209, controller; 3, cylinder head; 301, cooling trough; 302, drain pipe; 4, driving mechanism; 401, ring gear; 402, gear; 403, first motor; 404, second wedge block; 5, liquid supply component; 501, liquid storage ring; 502, liquid supply pipe; 503, one-way valve; 504, liquid supply pump; 6, cover body; 601, air inlet pipe; 602, air outlet pipe; 603, reflector. DETAILED DESCRIPTION

[0020] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example 1 In order to solve the problem that the existing injector cooling unit is generally static cooling or continuous spraying, the cooling system has high energy consumption and large amount of coolant usage, please refer to Figure 1-Figure 4 The present invention provides a diesel engine injector cooling unit, comprising a plurality of cooling components 1 uniformly distributed circumferentially around a nozzle body 2, the cooling component 1 comprising a bladder 101, a liquid spraying pipe 102 connected to the bladder 101, and an extrusion member 104 for squeezing the bladder 101 to pulse-impact the coolant on the nozzle body 2; the nozzle body 2 is arranged at an angle and rotatably mounted on a cylinder head 3, a cooling groove 301 is provided on the cylinder head 3, the cooling component 1 is arranged on the inner wall of the circumference of the cooling groove 301, and a drain pipe 302 connected to the cooling groove 301 is provided on the side of the cylinder head 3 for discharging the coolant after the cooling effect is completed and returning it to the cooling system for recycling; a driving mechanism 4 is also provided in the cooling groove 301, the driving mechanism 4 is used to drive the nozzle body 2 to rotate to achieve multi-directional fuel injection, and synchronously drive the extrusion member 104 in each cooling component 1 to periodically compress the corresponding bladder 101 to achieve pulse cooling of the nozzle body 2.

[0022] The spray pipe 102 is vertically arranged on one side of the sac 101, and a plurality of branches 103 are axially evenly spaced on the spray pipe 102. A nozzle is provided at the end of the branch 103, and the nozzle is arranged toward the surface of the nozzle body 2 for spraying the coolant onto the nozzle body 2 in a multi-point impact manner.

[0023] The extrusion member 104 includes a fixed seat 104a and a movable rod 104b movably arranged in the fixed seat 104a; an extrusion plate 104c is fixedly provided at one end of the movable rod 104b close to the capsule 101, and a first wedge block 104d is fixed at the other end. A spring 104e is sleeved on the movable rod 104b between the extrusion plate 104c and the fixed seat 104a, which is used to provide a reset force to make the extrusion plate 104c automatically rebound in an unpressurized state, thereby releasing the compression effect on the capsule 101.

[0024] like Figure 5 As shown, a rotating cylinder 201 is sleeved on the injector body 2, and a fixed sleeve 202 is coaxially sleeved outside the rotating cylinder 201. The fixed sleeve 202 is rotationally connected to the rotating cylinder 201, and the fixed sleeve 202 passes through and is fixed in the cylinder head 3.

[0025] The driving mechanism 4 includes a ring gear 401, a gear 402 meshing with the ring gear 401, and a first motor 403 for driving the gear 402 to rotate; the ring gear 401 is fixedly mounted on the rotating cylinder 201 through a bracket, and a second wedge block 404 is provided on the top of the ring gear 401 to cooperate with the first wedge block 104d; the second wedge block 404 is located below the inclined direction of the injector body 2.

[0026] The first motor 403 drives the gear 402 to rotate, driving the ring gear 401 to rotate, and the ring gear 401 drives the rotating cylinder 201 and the nozzle body 2 to rotate slowly; the second wedge block 404 rotates synchronously with the ring gear 401. When the second wedge block 404 rotates to the position of the first wedge block 104d in a certain cooling component 1, the two come into contact, and the first wedge block 104d is acted upon by the thrust, forcing the movable rod 104b fixed to it to move, and the movable rod 104b drives the extrusion plate 104c to compress the capsule 101. After the capsule 101 is pressurized, the internal coolant is ejected from multiple nozzles through the spray pipe 102 and its branch pipe 103 at high speed, impacting the surface of the nozzle body 2; when the second wedge block 404 rotates past the first wedge block 104d, the pressure is released, and the spring 104e pushes the movable rod 104b and the extrusion plate 104c to return to their original state, and the capsule 101 returns to its original state.

[0027] like Figure 6As shown, the cooling unit also includes a liquid supply component 5 for providing coolant to each bladder 101; the liquid supply component 5 includes a liquid storage ring 501 fixed in the cylinder head 3, and the liquid storage ring 501 is provided with a plurality of liquid supply pipes 502 corresponding to each bladder 101 one by one, and a one-way valve 503 is provided on the liquid supply pipe 502 to prevent the coolant from flowing back. The liquid storage ring 501 is also provided with a liquid supply pump 504 for transporting the coolant to the bladder 101.

[0028] After the diesel engine is running, the ECU determines whether to enable the rotary injection and linked cooling functions based on the current working conditions. If enabled, the drive mechanism 4 starts to operate, and the drive mechanism 4 drives the injector body 2 to rotate slowly. The injector body 2 continuously changes the injection angle as it rotates, so that the fuel is more evenly distributed in the combustion chamber; the drive mechanism 4 drives the extrusion parts 104 in each cooling component 1 to compress the corresponding capsule 101 in turn. After the capsule 101 is pressurized, the coolant stored therein is sprayed out through the spray pipe 102, impacting the surface of the injector body 2, realizing pulse cooling, and enhancing local heat exchange efficiency. After the coolant completes the cooling effect, it is collected in the cooling tank 301 and discharged from the drain pipe 302. The drive mechanism 4 is used to drive the extrusion part 104 to compress the capsule 101. No additional power source is required, and the structure is simple and reliable.

[0029] Example 2 On the basis of the first embodiment, in order to improve the overall thermal management performance, as shown in FIG. Figure 7 As shown, a cover 6 for sealing the space of the cooling tank 301 is provided, and an air cooling component is provided on the cover 6; the air cooling component includes an air inlet pipe 601 and an air outlet pipe 602.

[0030] During the cooling process, external air is introduced to assist in heat dissipation. The liquid cooling of the cooling component 1 is combined with the air cooling component to improve the overall thermal management performance.

[0031] Example 3 On the basis of the first and second embodiments, in order to allow the coolant to impact the various surfaces of the nozzle body 2 and avoid the problem of local overheating, as shown in FIG. Figure 7 As shown, the nozzle body 2 is also provided with a rotation component, which includes a reflection plate 603 fixed to one side of the inner wall of the cover body 6, a sensor 208 fixed to one side of the outer end of the nozzle body 2, a second motor 203 fixed on the rotating cylinder 201, and a controller 209; the second motor 203 is used to drive the nozzle body 2 to rotate so that the sensor 208 is always facing the reflection plate 603, ensuring that each surface of the nozzle body 2 can be impacted by the coolant during the revolution around the center.

[0032] The injector body 2 is rotatably connected to the rotating cylinder 201. A first injection pipe 204 and a second injection pipe 205 are provided at the outer end of the injector body 2. A first rotary joint 206 is provided between the injector body 2 and the first injection pipe 204, and a second rotary joint 207 is provided between the first injection pipe 204 and the second injection pipe 205. This ensures stable fuel supply even when the injector body 2 is rotating. High-pressure-resistant dynamic sealing structures are employed between the rotating cylinder 201 and the fixed sleeve 202, as well as between the injector body 2 and the rotating cylinder 201. Both the first rotary joint 206 and the second rotary joint 207 are high-pressure rotary joints, ensuring reliable sealing even during rotation, meeting the operational requirements of the diesel engine's high-pressure fuel system.

[0033] During the revolution of the injector body 2, the sensor 208 installed at the outer end of the injector body 2 continuously detects its orientation. When the sensor 208 detects a deviation from the set angle, the controller 209 controls the second motor 203 to operate, and the second motor 203 drives the injector body 2 to rotate so that it always faces the reflector 603, so that the injector body 2 always keeps one surface facing the reflector 603 during the revolution, ensuring that the coolant can impact all surfaces of the injector body 2 to avoid local overheating.

[0034] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A diesel engine fuel injector cooling unit, comprising a plurality of cooling components (1) uniformly distributed around a fuel injector body (2) along a circumferential direction, characterized in that: The cooling component (1) comprises a sac (101), a liquid spraying pipe (102) in communication with the sac (101), and an extrusion member (104) for extruding the sac (101) to cause the coolant to impact the nozzle body (2) in a pulsed manner. The fuel injector body (2) is tilted and rotatably mounted on the cylinder head (3); a cooling groove (301) is provided on the cylinder head (3); and the cooling component (1) is provided on the inner wall of the cooling groove (301); A driving mechanism (4) is also provided in the cooling groove (301), and the driving mechanism (4) is used to drive the nozzle body (2) to rotate to achieve multi-directional oil injection, and simultaneously drive the extrusion parts (104) in each cooling component (1) to periodically compress the corresponding capsule (101) to achieve pulsed cooling of the nozzle body (2).

2. A diesel engine injector cooling unit according to claim 1, characterized in that: The liquid spray pipe (102) is vertically arranged on one side of the capsule (101), and a plurality of branch pipes (103) are equidistantly arranged along the axial direction on the liquid spray pipe (102). A nozzle is provided at the end of each branch pipe (103), and the nozzle is arranged toward the surface of the nozzle body (2).

3. A diesel engine injector cooling unit according to claim 1, characterized in that: The extrusion member (104) comprises a fixed seat (104a) and a movable rod (104b) movably arranged in the fixed seat (104a); An extrusion plate (104c) is fixedly provided at one end of the movable rod (104b) close to the capsule (101), and a first wedge block (104d) is fixedly provided at the other end. A spring (104e) is sleeved on the movable rod (104b) between the extrusion plate (104c) and the fixed seat (104a).

4. A diesel engine injector cooling unit according to claim 3, characterized in that: A rotating cylinder (201) is sleeved and mounted on the fuel injector body (2), a fixed sleeve (202) is coaxially sleeved outside the rotating cylinder (201), the fixed sleeve (202) is rotatably connected to the rotating cylinder (201), and the fixed sleeve (202) passes through and is fixed in the cylinder head (3).

5. A diesel engine injector cooling unit according to claim 4, characterized in that: The driving mechanism (4) comprises a ring gear (401), a gear (402) meshing with the ring gear (401), and a first motor (403) for driving the gear (402) to rotate; The gear ring (401) is fixedly sleeved on the rotating cylinder (201) via a bracket, and a second wedge block (404) that matches the first wedge block (104d) is provided on the top of the gear ring (401); The second wedge-shaped block (404) is located below the nozzle body (2) in the tilting direction.

6. A diesel engine injector cooling unit according to claim 1, characterized in that: The cooling unit further includes a liquid supply component (5) for providing cooling liquid to each capsule (101); The liquid supply component (5) comprises a liquid storage ring (501) fixed in the cylinder head (3); the liquid storage ring (501) is provided with a plurality of liquid supply pipes (502) corresponding one-to-one to each sac (101); the liquid supply pipes (502) are provided with a one-way valve (503); and the liquid storage ring (501) is also provided with a liquid supply pump (504) for conveying coolant to the sac (101).

7. A diesel engine injector cooling unit according to claim 1, characterized in that: A drain pipe (302) connected to the cooling groove (301) is provided on the side of the cylinder head (3).

8. A diesel engine injector cooling unit according to claim 1, characterized in that: The cooling groove (301) is provided with a cover (6) for sealing the space thereof, and the cover (6) is provided with an air cooling component; The air cooling component comprises an air inlet pipe (601) and an air outlet pipe (602).

9. A diesel engine injector cooling unit according to claim 4, characterized in that: The fuel injector body (2) is also provided with a self-rotating assembly, which comprises a reflective plate (603) fixed to one side of the inner wall of the cover body (6), a sensor (208) fixed to one side of the outer end of the fuel injector body (2), a second motor (203) fixed to the rotating cylinder (201), and a controller (209); The second motor (203) is used to drive the nozzle body (2) to rotate so that the sensor (208) always faces the reflective plate (603), ensuring that each surface of the nozzle body (2) is impacted by the coolant during the process of the nozzle body (2) revolving around the center.

10. A diesel engine injector cooling unit according to claim 9, characterized in that: The fuel injection nozzle body (2) is rotatably connected to the rotating cylinder (201); A first fuel injection pipe (204) and a second fuel injection pipe (205) are provided at the outer end of the fuel injection nozzle body (2); a first rotary joint (206) is provided between the fuel injection nozzle body (2) and the first fuel injection pipe (204); and a second rotary joint (207) is provided between the first fuel injection pipe (204) and the second fuel injection pipe (205).

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