A whole-machine heat dissipation device and method for diesel generators

Abstract

This application discloses a whole-machine heat dissipation device and method for a diesel generator. The whole-machine heat dissipation device includes: an outer cover, multiple ducted fans, an air ejector, a smoke guide pipe, and a duct. The outer cover is divided into a working layer, a mixing layer, and an exhaust layer along a direction close to the horizontal ground by a support plate, an exhaust plate, and a bracket. The diesel generator body is disposed in the working layer. Each air inlet of the outer cover is provided with a ducted fan. The air outlet of the ducted fan faces the side where the diesel generator body is located. The air ejector is disposed in the working layer of the outer cover. The nozzle inlet of the air ejector is connected to the exhaust port of the diesel generator body through an exhaust pipe. The air inlet of the smoke guide pipe is connected to the nozzle outlet of the air ejector. The air outlet is connected to the flue gas outlet of the support plate. The air inlet of the duct is connected to the air outlet of the heat exchanger of the diesel generator body. One end of the air outlet of the duct extends through a flow channel hole in the support plate to the mixing layer.

Description

Technical Field

[0001] This application relates to the field of heat engine cooling technology, and more specifically, to a whole-machine cooling device and method for diesel generators. Background Technology

[0002] A diesel generator is a small power generation device that uses diesel fuel and a diesel engine as the prime mover to drive a generator, converting other forms of energy into electrical energy. Diesel generators have advantages such as high reliability, rapid start-up, and simple maintenance, and are therefore widely used in many fields. During operation, the diesel generator's temperature rises, and it produces a large amount of high-temperature exhaust gas. Currently, most diesel engines use internal water cooling, relying on natural heat dissipation from the engine's hot surfaces. This method has low heat dissipation efficiency and directly releases exhaust gas into the atmosphere, easily causing significant thermal pollution and exacerbating the greenhouse effect. Summary of the Invention

[0003] This application provides a whole-machine heat dissipation device and method for diesel generators, in order to overcome at least one technical problem existing in the prior art.

[0004] The specific technical solution is as follows:

[0005] In a first aspect, embodiments of this application provide a whole-machine heat dissipation device for a diesel generator, comprising:

[0006] The outer casing, perpendicular to the horizontal ground, has a carrying plate and an exhaust plate arranged sequentially inside the casing along the direction close to the horizontal ground. A bracket is provided on the end face of the exhaust plate away from the carrying plate, and the bracket is located outside the outer casing. The carrying plate, the exhaust plate, and the bracket divide the outer casing into a working layer, a mixing layer, and an exhaust layer along the direction close to the horizontal ground. The diesel generator body is mounted on the carrying plate, located within the working layer. Multiple air inlets are provided on the end face of the outer casing away from the heat exchanger of the diesel generator body. A flue gas outlet and a flow channel are provided at the end of the carrying plate away from the air inlets.

[0007] Multiple ducted fans are provided, each located within the working layer of the outer casing, with one ducted fan at each air inlet. The air outlets of the ducted fans face the side where the diesel generator body is located.

[0008] An air ejector is disposed within the working layer of the outer casing, and the nozzle inlet of the air ejector is connected to the exhaust port of the diesel generator body via an exhaust pipe.

[0009] A smoke guide pipe, wherein the air inlet of the smoke guide pipe is connected to the nozzle outlet of the air ejector, and the air outlet of the smoke guide pipe is connected to the flue gas outlet.

[0010] The air duct has an air inlet connected to the air outlet of the heat exchanger of the diesel generator body. One end of the air outlet of the air duct extends through the flow channel through hole to the mixing layer, and the air outlet of the air duct faces the side where the flue gas outlet is located.

[0011] In some embodiments of this application, the air ejector includes a mixing nozzle and a lobed nozzle. The mixing nozzle includes an intake section, a converging section, a mixing section, and a diffuser section that are sequentially connected and coaxially arranged. The diameter of the converging section gradually decreases from the inlet end to the outlet end, and the diameter of the diffuser section gradually increases from the inlet end to the outlet end. The lobed nozzle is fixedly disposed inside the mixing nozzle and is coaxial with the mixing nozzle. The lobed nozzle includes an integrally disposed flue gas inflow section and a flue gas injection section. The flue gas inflow section has a cylindrical structure and is fixedly disposed inside the intake section. An annular channel is formed between the outer wall of the flue gas inflow section and the intake section. The flue gas injection section is located at the outlet end of the converging section, and the outlet of the flue gas injection section faces the mixing section.

[0012] In some embodiments of this application, the end of the flue gas injection section away from the flue gas inflow section is in the shape of multiple lobes evenly distributed at equal intervals, and is connected to the flue gas injection section in a streamlined transition.

[0013] In some embodiments of this application, a plurality of equidistant and uniformly distributed ventilation openings are provided on the end face of the heat exchanger away from the diesel generator body of the outer cover. The plurality of ventilation openings are located on the working layer and are located at one end of the working layer near the mixing layer.

[0014] In some embodiments of this application, the exhaust plate is provided with a plurality of first exhaust holes evenly distributed at equal intervals, each of the first exhaust holes having the same shape, and the shape of the first exhaust hole is one of rectangle, trapezoid, triangle or hexagon.

[0015] In some embodiments of this application, the size of the first exhaust hole gradually increases along the direction away from the air outlet of the air duct.

[0016] In some embodiments of this application, the bracket includes a support plate, support columns and connecting columns. The exhaust plate is fitted onto the support plate, and the support plate is provided with second exhaust holes corresponding to a plurality of first exhaust holes. A support column is fixedly provided at each of the four corners of the end face of the support plate away from the exhaust plate, and the ends of the two support columns away from the support plate are connected by a connecting column.

[0017] In some embodiments of this application, the shape of the flow channel through hole is a quasi-isosceles trapezoid, and the cross-section of the air guide pipe at the load plate is a quasi-isosceles trapezoid, and the shape and size are the same as those of the flow channel through hole.

[0018] In some embodiments of this application, the outer wall surface of the outer cover is covered with a layer of heat-insulating material.

[0019] Secondly, embodiments of this application provide a method for overall heat dissipation of a diesel generator, based on the overall heat dissipation device for a diesel generator described in the first aspect, comprising:

[0020] Air from the external environment is drawn into the working layer inside the casing by a ducted fan. The first part of the air is absorbed by the diesel generator body for combustion and power generation, and after being converted into flue gas, it is transported to the corrugated nozzle of the air ejector through the exhaust pipe. The second part of the air exchanges heat with the hot surface of the diesel generator body and the exhaust pipe and smoke guide pipe. Then, under the action of the fan of the heat exchanger of the diesel generator body, it is discharged to the mixing layer in the casing through the air guide pipe. The third part of the air is drawn into the mixing nozzle through the annular channel between the outer wall of the flue gas inlet of the corrugated nozzle and the mixing nozzle of the air ejector under the ejection action of the corrugated nozzle, and is mixed with the flue gas injected by the corrugated nozzle for the first time. The mixed flue gas is discharged to the mixing layer through the smoke guide pipe.

[0021] The flue gas discharged through the flue pipe and the air discharged through the air duct are mixed a second time in the mixing layer. After that, the flue gas is discharged to the exhaust layer through the first exhaust hole on the exhaust plate and the second exhaust hole on the bracket, and then enters the external environment.

[0022] The beneficial effects of the embodiments of this application are as follows:

[0023] By using forced convection and air ejection, the airflow near the diesel generator is accelerated, which greatly improves the heat dissipation of the diesel generator body. The air ejection is mixed with the high-temperature flue gas for the first time, and then the flue gas is mixed with the air for the second time at the end, which cools the exhaust gas of the diesel generator. This can effectively ensure the safe and stable operation of the diesel generator and avoid thermal pollution to the environment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A cross-sectional schematic diagram of a whole-machine heat dissipation device applied to a diesel generator, provided as an embodiment of this application;

[0026] Figure 2 This application provides a front view of the internal structure of a heat dissipation device for a diesel generator, as shown in an embodiment of the present application.

[0027] Figure 3 A top-view perspective view of the internal structure of a heat dissipation device for a diesel generator provided in an embodiment of this application;

[0028] Figure 4 A left-side perspective view of the internal structure of a heat dissipation device for a diesel generator provided in an embodiment of this application;

[0029] Figure 5 A perspective view of the internal structure of a heat dissipation device for a diesel generator provided in an embodiment of this application;

[0030] Figure 6 This is a front view of the internal structure of the outer cover, the support plate, the exhaust plate, and the bracket in a whole-machine heat dissipation device for a diesel generator, provided in an embodiment of this application.

[0031] Figure 7 A top view of a carrier plate in a whole-machine heat dissipation device for a diesel generator, provided in an embodiment of this application;

[0032] Figure 8 A top view of an exhaust plate in a cooling system for a diesel generator provided in an embodiment of this application;

[0033] Figure 9 A three-dimensional structural diagram of a bracket in a whole-machine heat dissipation device for a diesel generator provided in an embodiment of this application;

[0034] Figure 10 A three-dimensional structural schematic diagram of an air ejector in a whole-machine heat dissipation device for a diesel generator, provided in an embodiment of this application;

[0035] Figure 11 A three-dimensional structural schematic diagram of a wave-shaped nozzle in a whole-machine heat dissipation device for a diesel generator, provided for an embodiment of this application;

[0036] Figure 12 This is a three-dimensional structural diagram of a mixing nozzle in a whole-machine heat dissipation device for a diesel generator, provided as an embodiment of this application. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0039] This application discloses a whole-machine cooling device for diesel generators. Compared to the traditional natural cooling of diesel generators, this whole-machine cooling device uses a ducted fan to accelerate the airflow near the diesel generator, that is, to form forced air convection near the heating wall of the diesel generator, thereby enhancing the cooling of the diesel generator. At the same time, for the high-temperature flue gas generated by the diesel generator, this whole-machine cooling device uses an air ejector to inject air and mix it with the high-temperature flue gas, and secondary mixing of the flue gas with air at the end, so as to significantly reduce the exhaust gas temperature and avoid thermal pollution. Detailed descriptions follow.

[0040] Figure 1 – Figure 12 This illustration shows a whole-machine heat dissipation device for a diesel generator according to an embodiment of this application. For example... Figure 1 – Figure 12 As shown, the overall heat dissipation device mainly includes: outer cover 1, multiple ducted fans 5, air ejector 6, smoke duct 7, and air duct 8.

[0041] The outer casing provides space for the diesel generator body and other components of the overall cooling system, enabling a forced air convection structure design and providing mixing conditions for the two-stage mixing of flue gas and air. For example... Figure 1 – Figure 9As shown, the outer cover 1 is one of the main structures of the heat dissipation device of the whole machine. Specifically, it is a shell structure with one open end, and the open end is located at the end of the outer cover 1 that is close to the horizontal ground. In the direction perpendicular to the horizontal ground, a carrying plate 2 and an exhaust plate 3 are arranged in sequence inside the outer cover 1 along the direction close to the horizontal ground. The exhaust plate 3 is located at the open end of the outer cover 1, and a bracket 4 is arranged on the end face of the exhaust plate 3 away from the carrying plate 2. The bracket 4 is located outside the outer cover 1. The carrying plate 2, the exhaust plate 3, and the bracket 4 divide the outer cover 1 into a working layer 11, a mixing layer 12, and an exhaust layer 13 along the direction close to the horizontal ground. That is to say, in the direction perpendicular to the horizontal ground, the outer cover 1 is divided into a working layer 11, a mixing layer 12, and an exhaust layer 13 from top to bottom by the carrying plate 2, the exhaust plate 3, and the bracket 4. The working layer 11 is the main working space of the entire machine's heat dissipation device. The diesel generator body 9 is located in the working layer 11 and is specifically fixed on the support plate 2. The diesel generator body 9 includes a heat exchanger 91, which exchanges heat with the coolant used to cool the cylinder block of the diesel generator body 9. Multiple air inlets 14 are provided on one end face of the outer cover 1 located in the working layer 11, and this end face is away from the heat exchanger 91 of the diesel generator body 9, so that the external airflow entering from the air inlets 14 sweeps across the hot surface of the diesel generator body 9 before flowing through the heat exchanger 91. The mixing layer 12 is a space for secondary mixing of flue gas and air. A flue gas outlet 21 and a flow channel through-hole 22 are provided on the carrier plate 2 between the mixing layer 12 and the working layer 11, so that the flue gas in the working layer 11 flows into the mixing layer 12 through the flue gas outlet 21, and the air participating in the secondary mixing enters the mixing layer 12 through the flow channel through-hole 22. Furthermore, both the flue gas outlet 21 and the flow channel through-hole 22 are located away from the end of the air inlet 14, that is, close to the exhaust port of the diesel generator body 9 and the air outlet of the heat exchanger 91, thus reducing the length of the gas delivery pipe (i.e., the smoke guide pipe 7 and the air guide pipe 8 in this application). The exhaust layer 13 is the space for discharging the flue gas after the two mixing and cooling processes. It is connected to the mixing layer 12 and the external environment, so that the gas discharged from the mixing layer 12 can be quickly diffused into the external environment through the exhaust layer 13.

[0042] The ducted fan is the main component of the overall cooling system that enables forced air convection cooling. For example... Figure 1 – Figure 5As shown, multiple ducted fans 5 are installed inside the working layer 11 of the outer casing 1. Specifically, each air inlet 14 is provided with one ducted fan 5. The air outlet of the ducted fan 5 faces the side where the diesel generator body 9 is located. The number of ducted fans 5 can be set according to the size of the diesel generator body 9. For example, when the size of the diesel generator body 9 is not large, two ducted fans 5 can be used. The air outlets of the two ducted fans 5 face the long side hot surface of the diesel generator body 9 respectively, so as to maximize the heat dissipation effect of the hot surface of the diesel generator body 9. In a specific embodiment, the outer casing 1 has multiple equidistant and evenly distributed ventilation openings 15 on the end face of the air inlet 14. These ventilation openings 15 are located on the working layer 11, and are positioned at the end of the working layer 11 near the mixing layer 12, i.e., below the air inlet 14 in a direction perpendicular to the horizontal ground. This ensures a uniform pressure difference between the inside and outside of the outer casing 1, thereby enabling forced convection cooling of the air inside the outer casing 1. Simultaneously, the location of the ventilation openings 15 below the air inlet 14 prevents the air after forced convection heat exchange from being directly discharged into the external environment, ensuring sufficient air for secondary mixing of the flue gas. In the specific implementation process, the ducted fan 5 is selected from any existing ducted fan that meets the requirements of this application, ensuring that forced convection cooling of the entire diesel generator body 9 is achieved. Furthermore, the power supply for the ducted fan 5 can be provided by the diesel generator body 9, and the air intake of the ducted fan 5 can be adjusted according to the load of the diesel generator body 9 to achieve optimal cooling efficiency.

[0043] The air ejector is the main structure in the overall heat dissipation system that initiates the initial mixing of high-temperature flue gas with air. For example... Figure 1 , Figure 3 , Figure 10 , Figure 11 as well as Figure 12 As shown, the air ejector 6 is located within the working layer 11 of the outer casing 1. The nozzle inlet of the air ejector 6 is connected to the exhaust port of the diesel generator body 9 via the exhaust pipe 92. The high-temperature flue gas generated by the diesel generator body 9 is transported to the air ejector 6 through the exhaust pipe 92, where it undergoes a first mixing with the air ejected by the air ejector 6 to reduce the exhaust gas temperature. The nozzle outlet of the air ejector 6 is connected to the air inlet of the smoke guide pipe 7, and the air outlet of the smoke guide pipe 7 is connected to the flue gas outlet 21. After the initial cooling, the flue gas is transported from the working layer 11 to the mixing layer 12 through the smoke guide pipe 7 for a second mixing. Simultaneously, within the working layer 11, forced convection air also flows through the exhaust pipe 92 and the smoke guide pipe 7, thereby initially cooling the high-temperature flue gas generated by the diesel generator body 9 within the exhaust pipe 92 and further cooling the flue gas after the first mixing and cooling within the smoke guide pipe 7.

[0044] In some embodiments, such as Figure 10 – Figure 12 As shown, the air ejector 6 includes a mixing nozzle 61 and a lobed nozzle 62. The mixing nozzle 61 includes an intake section 614, a converging section 611, a mixing section 612, and a diffuser section 613, which are connected in sequence and coaxially arranged. Both the intake section 614 and the mixing section 612 are cylindrical structures with openings at both ends. The diameter of the converging section 611 gradually decreases from the inlet end to the outlet end, and the diameter of the diffuser section 613 gradually increases from the inlet end to the outlet end. A corrugated nozzle 62 is fixedly disposed within and coaxial with a mixing nozzle 61. The corrugated nozzle 62 includes an integrally formed flue gas inlet section 621 and a flue gas injection section 622. The flue gas inlet section 621 has a cylindrical structure and is fixedly disposed within the intake section 614 of the mixing nozzle 61. An annular channel is formed between the outer wall of the flue gas inlet section 621 and the intake section 614. The flue gas injection section 622 is located at the outlet end of the contraction section 611, and its outlet faces the mixing section 612. The inlet of the flue gas inlet section 621 is connected to an exhaust pipe. The expansion section of the mixing nozzle 61... The nozzle outlet of the diffuser 613 is connected to the air inlet of the flue gas duct 7. The high-temperature flue gas flows into the flue gas injection section 622 through the flue gas inlet section 621, and is accelerated by the flue gas injection section 622 with a specific structural design to the mixing section 612 of the mixing nozzle 61. During this process, due to the accelerated injection of the flue gas, a negative pressure zone is formed at the outlet of the flue gas injection section 622, which causes the external air to be drawn into the mixing section 612 from the air inlet of the annular channel of the mixing nozzle 61 under pressure. In the mixing section 612, the flue gas is mixed with the high-temperature flue gas to reduce the flue gas temperature. After that, it flows into the flue gas duct 7 through the diffuser 613.

[0045] Furthermore, such as Figure 11 As shown, the end of the flue gas injection section 622 away from the flue gas inflow section 621 has a multi-lobed shape with equal and uniformly distributed lobes, and is streamlinedly connected to the flue gas injection section 622. Here, "lobed shape" in this application refers to... Figure 11 The shape shown is formed by four quarter-circular arcs and two straight lines. Two of the quarter-circular arcs have the same radius, and the other two have the same radius, but smaller than the radii of the first two quarter-circular arcs. The two larger-radius quarter-circular arcs are connected at one end and are centered on the same point. The two ends of the straight lines connect the larger-radius and smaller-radius quarter-circular arcs respectively. The two smaller-radius quarter-circular arcs are positioned opposite each other, and the distance between the two ends of the larger-radius quarter-circular arcs connected by the two straight lines is greater than the distance between the two ends of the smaller-radius quarter-circular arcs connected by the two straight lines. This specific structural design of the multi-lobed flue gas injection section 622 enables accelerated injection of high-temperature flue gas.

[0046] It should be noted and understood that the air ejector in this application embodiment replaces the nozzle in the traditional ejector with the multi-lobed nozzle in this embodiment, which is one of the inventive points of this application. Under the condition of ensuring the ejection function, the mixing of air and high-temperature flue gas is enhanced, and the overall length and size of the ejector are shortened while ensuring high ejection efficiency and mixing efficiency.

[0047] In the embodiments of this application, such as Figure 1 As shown, the air inlet of the air duct 8 is connected to the air outlet of the heat exchanger 91 of the diesel generator body 9. One end of the air outlet of the air duct 8 extends through the flow channel through hole 22 to the mixing layer 12, and the air outlet of the air duct 8 faces the side where the flue gas outlet 21 is located, thereby transporting the air discharged from the heat exchanger 91 to the mixing layer 12, where it is mixed with the flue gas sprayed from the flue gas outlet 21 for secondary mixing, further reducing the flue gas temperature.

[0048] In some embodiments, such as Figure 7 As shown, the flow channel through-hole 22 is shaped like an isosceles trapezoid, and the cross-section of the air guide duct at the loading plate 2 is also shaped like an isosceles trapezoid, and has the same shape and size as the flow channel through-hole 22. Furthermore, as... Figure 3 As shown, the cross-section of the air duct 8 gradually increases from the point where it is connected to the air outlet of the heat exchanger 91 to the air outlet of the air duct 8, and the cross-section at the air outlet of the air duct 8 is the same as the vertical cross-section of the mixing layer 12, so as to ensure that the flue gas and air are fully mixed.

[0049] In other embodiments, such as Figure 8 As shown, the exhaust plate 3 has multiple evenly distributed first exhaust holes 31 at equal intervals. Each first exhaust hole 31 has the same shape, and its shape can be rectangular, trapezoidal, triangular, or hexagonal. For example, a rectangular opening can be used for the first exhaust hole 31 to ensure the load-bearing strength of the exhaust plate 3 while ensuring gas flow between the blending layer and the exhaust layer. Of course, trapezoidal, triangular, or hexagonal openings can also be used, as long as their shape and size do not affect the load-bearing strength and flow. Furthermore, in the specific implementation process, such as... Figure 2 and Figure 8 As shown, the size of the first exhaust hole 31 gradually increases along the direction away from the air outlet of the air duct 8. In the blending layer 12, the gas flow rate decreases from the air outlet of the air duct 8 to both sides. Therefore, the air flow requirements on both sides are greater than those at the air outlet of the air duct 8. This application adopts a first exhaust hole 31 whose size gradually increases along the direction away from the air outlet of the air duct 8, which can effectively accelerate the exhaust and ensure the overall gas flow of the blending layer 12.

[0050] In other embodiments, such as Figure 9As shown, the support 4 includes a support plate 41, support columns 42, and connecting columns 43. The exhaust plate is fitted onto the support plate 41, and the support plate 41 is provided with second exhaust holes 411 corresponding to multiple first exhaust holes. The second exhaust holes 411 enable gas flow between the exhaust layer and the mixing layer. A support column 42 is fixedly installed at each of the four corners of the end face of the support plate 41 away from the exhaust plate 3. The ends of two support columns 42 away from the support plate 41 are connected by a connecting column 43. Thus, the support plate 41, support columns 42, and connecting columns 43 ensure the overall load-bearing capacity of the support 4 and enable rapid exhaust of the mixing layer.

[0051] In this embodiment, the outer wall of the outer casing is covered with a heat-insulating material layer to shield the infrared rays emitted by the diesel generator body due to heat generation during operation.

[0052] The above describes the various components of the overall cooling device for a diesel generator provided in this embodiment, and their connection relationships. The following section will discuss further details. Figure 1 – Figure 12 This paper provides a brief overview of the working principles of each layer of the overall heat dissipation device used in diesel generators.

[0053] Air from the external environment is drawn into the working layer 11 by the ducted fan 5, where it exchanges heat with the diesel generator body 9, exhaust pipe 92, and smoke guide pipe 7. Part of the air in the working layer 11 is also ejected by the air ejector 6, mixing with the flue gas to lower its temperature. The mixed flue gas then mixes again with the air after heat exchange in the working layer 11 in the mixing layer 12. Afterward, it enters the exhaust layer 13 through the exhaust plate 3 and is discharged to the external environment by the support 4. By using forced convection and ejected air, the low efficiency of traditional heat dissipation methods is solved, greatly enhancing the heat dissipation of the diesel generator.

[0054] Another embodiment of this application discloses a method for overall heat dissipation of a diesel generator, based on the overall heat dissipation device for a diesel generator described in the foregoing embodiments. The specific structure and working principle of this overall heat dissipation device can be found in the foregoing embodiments of the overall heat dissipation device for a diesel generator, and will not be repeated here. Combined with... Figure 1 – Figure 12 As shown, the overall heat dissipation method includes:

[0055] Air from the external environment is drawn into the working layer 11 in the outer casing 1 by the ducted fan 5. The first part of the air is absorbed by the diesel generator body 9 and burned to do work. After being converted into flue gas, it is transported to the corrugated nozzle 62 of the air ejector 6 by the exhaust pipe 92. The second part of the air exchanges heat with the hot surface of the diesel generator body 9, the exhaust pipe 92, and the smoke guide pipe 7 to achieve cooling and enhanced heat dissipation. Then, under the action of the fan of the heat exchanger 91 of the diesel generator body 9, it is discharged to the mixing layer 12 in the outer casing 1 through the air guide pipe 8. The third part of the air is drawn into the mixing nozzle 61 by the annular channel between the outer wall of the flue gas inlet 621 of the corrugated nozzle 62 and the mixing nozzle 61 of the air ejector 6 under the ejection action of the corrugated nozzle 62. It is mixed with the flue gas injected by the corrugated nozzle 62 for the first time. The mixed flue gas is discharged to the mixing layer 12 by the smoke guide pipe 7.

[0056] The flue gas discharged through the smoke duct 7 and the air discharged through the air duct 8 are mixed for the second time in the mixing layer 12. After that, the flue gas is discharged to the exhaust layer 13 through the first exhaust hole 31 on the exhaust plate 3 and the second exhaust hole 411 on the bracket 4, and then enters the external environment.

[0057] In summary, the embodiments of this application provide a whole-machine heat dissipation device and method for diesel generators. By using forced convection and air ejection, the airflow near the diesel generator is accelerated, which greatly improves the heat dissipation effect of the diesel generator body. The air ejection is mixed with the high-temperature flue gas for the first time, and then the flue gas end is mixed with the air for the second time, which realizes the cooling of the diesel generator exhaust gas. This can effectively ensure the safe and stable operation of the diesel generator and avoid thermal pollution to the environment.

[0058] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Furthermore, the modules in the apparatus of the embodiments may be distributed throughout the apparatus of the embodiments as described, or they may be located in one or more apparatuses different from this embodiment, with corresponding changes. The modules of the above embodiments may be combined into one module, or further divided into multiple sub-modules.

[0059] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. In addition, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0060] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A whole-machine heat dissipation device for diesel generators, characterized in that, include: The outer casing, perpendicular to the horizontal ground, has a carrying plate and an exhaust plate arranged sequentially inside the casing along the direction close to the horizontal ground. A bracket is provided on the end face of the exhaust plate away from the carrying plate, and the bracket is located outside the outer casing. The carrying plate, the exhaust plate, and the bracket divide the outer casing into a working layer, a mixing layer, and an exhaust layer along the direction close to the horizontal ground. The diesel generator body is mounted on the carrying plate, located within the working layer. Multiple air inlets are provided on the end face of the outer casing away from the heat exchanger of the diesel generator body. A flue gas outlet and a flow channel are provided at the end of the carrying plate away from the air inlets. Multiple ducted fans are provided, each located within the working layer of the outer casing, with one ducted fan at each air inlet. The air outlets of the ducted fans face the side where the diesel generator body is located. An air ejector is disposed within the working layer of the outer casing, and the nozzle inlet of the air ejector is connected to the exhaust port of the diesel generator body via an exhaust pipe. A smoke guide pipe, wherein the air inlet of the smoke guide pipe is connected to the nozzle outlet of the air ejector, and the air outlet of the smoke guide pipe is connected to the flue gas outlet. The air duct has an air inlet connected to the air outlet of the heat exchanger of the diesel generator body. One end of the air outlet of the air duct extends through the flow channel through hole to the mixing layer, and the air outlet of the air duct faces the side where the flue gas outlet is located.

2. The overall cooling device for a diesel generator according to claim 1, characterized in that, The air ejector includes a mixing nozzle and a lobed nozzle. The mixing nozzle includes an intake section, a contraction section, a mixing section, and a diffusion section that are connected sequentially and coaxially. The diameter of the contraction section gradually decreases from the inlet end to the outlet end, and the diameter of the diffusion section gradually increases from the inlet end to the outlet end. The lobed nozzle is fixedly disposed inside the mixing nozzle and is coaxial with the mixing nozzle. The lobed nozzle includes an integrally disposed flue gas inflow section and a flue gas injection section. The flue gas inflow section has a cylindrical structure and is fixedly disposed inside the intake section. An annular channel is formed between the outer wall of the flue gas inflow section and the intake section. The flue gas injection section is located at the outlet end of the contraction section, and the outlet of the flue gas injection section faces the mixing section.

3. The overall cooling device for a diesel generator according to claim 2, characterized in that, The end of the flue gas injection section away from the flue gas inflow section is a multi-lobed shape with equal and uniformly distributed lobes, and is streamlinedly connected to the flue gas injection section.

4. The overall cooling device for a diesel generator according to claim 1, characterized in that, The outer casing is provided with a plurality of equidistant and evenly distributed ventilation openings on the end face of the heat exchanger away from the diesel generator body. The plurality of ventilation openings are located on the working layer and are located at one end of the working layer near the mixing layer.

5. The overall cooling device for a diesel generator according to claim 1, characterized in that, The exhaust plate is provided with a plurality of first exhaust holes evenly distributed at equal intervals. Each first exhaust hole has the same shape, and the shape of the first exhaust hole is one of rectangle, trapezoid, triangle or hexagon.

6. The overall cooling device for a diesel generator according to claim 5, characterized in that, The size of the first exhaust hole gradually increases along the direction away from the air outlet of the air duct.

7. The overall cooling device for a diesel generator according to claim 5, characterized in that, The bracket includes a support plate, support columns, and connecting columns. The exhaust plate is fitted onto the support plate, and the support plate is provided with second exhaust holes that correspond one-to-one with a plurality of first exhaust holes. A support column is fixedly installed at each of the four corners of the end face of the support plate away from the exhaust plate, and the ends of the two support columns away from the support plate are connected by a connecting column.

8. The overall cooling device for a diesel generator according to claim 1, characterized in that, The flow channel through hole is shaped like an isosceles trapezoid, and the cross-section of the air guide pipe at the load plate is shaped like an isosceles trapezoid, and is the same shape and size as the flow channel through hole.

9. The overall cooling device for a diesel generator according to claim 1, characterized in that, The outer wall of the outer cover is covered with a layer of heat-insulating material.

10. A method for overall heat dissipation of a diesel generator, characterized in that, The overall cooling device for a diesel generator according to any one of claims 1–9 includes: Air from the external environment is drawn into the working layer inside the casing by a ducted fan. The first part of the air is absorbed by the diesel generator body for combustion and power generation, and after being converted into flue gas, it is transported to the corrugated nozzle of the air ejector through the exhaust pipe. The second part of the air exchanges heat with the hot surface of the diesel generator body and the exhaust pipe and smoke guide pipe. Then, under the action of the fan of the heat exchanger of the diesel generator body, it is discharged to the mixing layer in the casing through the air guide pipe. The third part of the air is drawn into the mixing nozzle through the annular channel between the outer wall of the flue gas inlet of the corrugated nozzle and the mixing nozzle of the air ejector under the ejection action of the corrugated nozzle, and is mixed with the flue gas injected by the corrugated nozzle for the first time. The mixed flue gas is discharged to the mixing layer through the smoke guide pipe. The flue gas discharged through the flue pipe and the air discharged through the air duct are mixed a second time in the mixing layer. After that, the flue gas is discharged to the exhaust layer through the first exhaust hole on the exhaust plate and the second exhaust hole on the bracket, and then enters the external environment.

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