Diesel generator heating device and method
By introducing air-source heat pumps and plate heat exchangers into diesel generators and combining them with intelligent control systems, the problem of low efficiency of traditional electric heating is solved, and an efficient and safe heating method is achieved, which is suitable for diesel generators in northern regions.
Patent Information
- Application Number
- CN202510936404.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-08
- Publication Date
- 2025-09-05
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The electric heating method of traditional diesel generators is inefficient, consumes a lot of energy, and causes scaling after long-term use, resulting in a high failure rate.
It uses air energy heat pump and plate heat exchanger, through the circulation system composed of fin heater and water pump, combined with temperature sensor and controller to achieve intelligent control, utilize the heat exchange between air energy heat pump and coolant, and electric heating as backup.
It improves heating efficiency, reduces energy consumption, reduces scaling, and ensures the safe and stable operation of diesel generators.
Smart Images
Figure CN120592784A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of diesel generators, and in particular to a diesel generator heating device and method. Background Art
[0002] Traditional diesel generator sets currently rely on electric heating, which is circulated to various parts of the cylinder via a pump to ensure smooth operation during emergency startup. Since electric heating efficiency is generally less than 69%, it is even less efficient when used in diesel generators. Over time, this efficiency can be further reduced due to factors such as scaling on the heating rods. Consequently, existing electric heating methods for diesel generators suffer from high energy consumption, low efficiency, and a high failure rate caused by scaling over time. Summary of the Invention
[0003] In view of the above-mentioned technical deficiencies, the present invention provides a diesel generator heating device and method.
[0004] The present invention adopts the following technical solution: a diesel generator heating device, comprising: The circulation pipeline is installed on the diesel generator and is used to heat the diesel generator; The water pump, the electric heating device and the heat exchanger are all connected in series in the circulation pipeline; The heat exchanger is connected to a heat pump, and the second working medium in the heat pump and the first working medium in the circulation pipeline realize heat exchange in the heat exchanger.
[0005] Preferably, a first temperature sensor is provided at the inlet of the first working medium in the heat exchanger, and the first temperature sensor is electrically connected to a first controller, and the first controller controls the connection between the heat pump and the water pump.
[0006] Preferably, a second temperature sensor is provided at the inlet of the first working medium in the electric heating device, the second temperature sensor is electrically connected to a second controller, and the second controller controls the connection between the electric heating device and the water pump.
[0007] Preferably, the electric heating device is a fin-type heater; and the heat pump is an air-energy heat pump.
[0008] Preferably, the heat exchanger is a plate heat exchanger, which is formed by staggered and stacked heat exchange plate groups; The heat exchange plate group includes: The diagonal positions at both ends of the bottom plate are connected to the liquid inlet pipe and the liquid outlet pipe respectively; The cover plate covers the bottom plate; a sealed second medium cavity is formed between the cover plate and the bottom plate; when multiple heat exchange plate groups are staggered and stacked, a sealed first medium cavity is formed between the cover plate and the bottom plate of another adjacent heat exchange plate group; A connecting pipe is fixed at one corner of the cover plate, one end of which is connected to the first medium cavity and the other end passes through the bottom plate; when multiple heat exchange plate groups are staggered and stacked, one end of the connecting pipe passes through the bottom plate and is connected to the first medium cavity in another adjacent heat exchange plate group; One end of the liquid inlet pipe is connected to the second medium cavity, and the other end passes through the cover plate; one end of the liquid outlet pipe is connected to the second medium cavity, and the other end passes through the bottom plate; when multiple heat exchange plate groups are staggered and overlapped, the liquid outlet pipe is connected to the liquid inlet pipe of another adjacent heat exchange plate group.
[0009] Preferably, a circuitous flow groove is provided on one side of the bottom plate close to the cover plate, and both ends of the flow groove are connected to the liquid inlet pipe and the liquid outlet pipe respectively; when the cover plate is covered on the bottom plate, the flow groove forms the second medium cavity; The cover plate is provided with inclined heat dissipation fins on a side away from the bottom plate; when a plurality of heat exchange plate groups are staggered and stacked, the gaps between the heat dissipation fins form the first medium cavity.
[0010] A diesel generator heating method comprises the following steps: When the temperature at the inlet of the first working medium in the electric heating device is lower than T1, the water pump starts; when the temperature at the inlet of the first working medium in the heat exchanger is higher than T3, the water pump stops; When the temperature at the inlet of the first working medium in the electric heating device is lower than T1, the electric heating device is delayed to start; when the temperature at the inlet of the first working medium in the electric heating device is higher than T2, the electric heating device is turned off; When the temperature at the inlet of the first working medium in the heat exchanger is higher than T2, the heat pump starts with a delay; when the temperature at the inlet of the first working medium in the heat exchanger is higher than T3, the heat pump shuts down; T1<T2<T3.
[0011] Preferably, when the heat pump enters the defrosting state, the water pump and the electric heating device are started.
[0012] Preferably, T1 is 15°C, T2 is 20°C, and T3 is 40°C.
[0013] Preferably, the delay time for the delayed start of the electric heating device and the heat pump is 30 seconds.
[0014] The beneficial effects of the present invention are: The present invention improves the original method of using electric heating to provide a heat source for the coolant of the diesel generator, and adds an air-energy heat pump heating structure and a new control logic; the air-energy heat pump uses a plate heat exchanger to perform heat exchange between the refrigerant and the coolant, and uses the original unit water pump for heat circulation. During use, the electric heating and the air-energy heat pump adopt an operating logic that serves as a complementary backup, which greatly improves the thermal efficiency of the heating device, while ensuring safety and easy modification and installation, which is beneficial for use in the northern region; the stacked heat exchanger has a compact structure, and the structural thickness and heat exchange capacity can be adjusted according to needs to adapt to different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0016] Figure 1 This is a schematic diagram of a diesel generator heating device according to the present invention.
[0017] Figure 2 It is a three-dimensional diagram of the heat exchange plate group.
[0018] Figure 3 Decomposition of heat exchange plate group Figure 1 .
[0019] Figure 4 Three-dimensional heat exchange plate group Figure 2 .
[0020] Figure 5 A three-dimensional diagram of the heat exchanger.
[0021] Figure 6 Exploded view of the heat exchanger.
[0022] Figure 7 This is a working flow diagram of a diesel generator heating device of the present invention. DETAILED DESCRIPTION
[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0024] Example 1: like Figure 1As shown, the present invention provides a diesel generator heating device, comprising a circulation pipeline 1 mounted on the diesel generator, through which a first working medium circulates for heating the diesel generator. A water pump 2 and an electric heater 3 are connected in series within the circulation pipeline 1. The water pump 2 circulates the first working medium, while the electric heater 3 utilizes a finned heater to heat the first working medium.
[0025] A heat exchanger 5 is also provided in the circulation pipeline 1. Heat exchanger 5 is connected to a heat pump 4. Heat is exchanged between the second working medium in the heat pump 4 and the first working medium in the circulation pipeline 1. In this embodiment, heat exchanger 5 is a plate heat exchanger, and heat pump 4 is an air-to-air heat pump. The first working medium is a coolant, such as water, and the second working medium is a refrigerant, such as Freon.
[0026] A first temperature sensor 51 is provided at the inlet of the first working medium in the heat exchanger 5. The first temperature sensor 51 detects the temperature of the first working medium at the inlet of the heat exchanger 5 in real time. The first temperature sensor 51 is electrically connected to a first controller 52. The first controller 52 is electrically connected to the heat pump 4 and the water pump 2. The first controller 52 controls the heat pump 4 and the water pump 2 based on the temperature information transmitted by the first temperature sensor 51.
[0027] A second temperature sensor 31 is provided at the inlet of the first working medium in the electric heating device 3. The second temperature sensor 31 measures the temperature of the first working medium at the inlet of the electric heating device 3 in real time. The second temperature sensor 31 is electrically connected to a second controller 32. The second controller 32 is electrically connected to the electric heating device 3 and the water pump 2. The second controller 32 controls the electric heating device 3 and the water pump 2 based on the temperature information transmitted by the second temperature sensor 31.
[0028] Example 2: like Figures 2 to 6 As shown, the present invention provides a plate-type heat exchanger 5 , which is composed of multiple heat exchange plate groups 50 stacked in a staggered manner. Adjacent heat exchange plate groups 50 are staggered 180°, with their ends swapped. The specific number of heat exchange plate groups 50 is selected based on demand, but should be at least two. Each heat exchange plate group 50 is connected by screws, and sealing gaskets are provided between adjacent surfaces.
[0029] The heat exchange plate group 50 comprises a bottom plate 51 and a cover plate 54 ; a recess is provided on the upper side of the bottom plate 51 , the cover plate 54 is embedded in the recess, and the periphery of the cover plate 54 is welded and fixed to the bottom plate 51 to form an integral structure.
[0030] A tortuous flow groove 56 is provided on one side of the bottom plate 51 close to the cover plate 54. The liquid inlet pipe 52 and the liquid outlet pipe 53 are respectively installed at the diagonal positions at both ends of the bottom plate 51, and are respectively connected to the two ends of the flow groove 56. After the cover plate 54 is welded to the bottom plate 51, the cover plate 54 fits the bottom surface of the bottom plate 51 trough, so that the flow groove 56 forms a closed second medium cavity. The lower end of the liquid inlet pipe 52 is connected to the second medium cavity, and the upper end passes through the cover plate 54, and a docking port is provided at the upper end of the liquid inlet pipe 52. The upper end of the liquid outlet pipe 53 is connected to the second medium cavity, and the lower end passes through the bottom plate 51, and a docking port is provided at the lower end of the liquid outlet pipe 53. The second medium cavity realizes the flow in and out of the second medium through the liquid inlet pipe 52 and the liquid outlet pipe 53. For example Figure 5 and Figure 6 As shown, when multiple heat exchange plate groups 50 are staggered and stacked, the liquid outlet pipe 53 connects with the liquid inlet pipe 52 in another adjacent heat exchange plate group 50, so that the second medium cavities in each heat exchange plate group 50 are connected in series to form a flow channel.
[0031] The cover plate 54 is provided with inclined heat dissipating fins 57 on one side away from the base plate 51, i.e., on the upper side of the cover plate 54. There is a gap between the end of the heat dissipating fin 57 and the side wall of the bottom plate 51 trough for the circulation of the medium. A step surface is provided on the bottom surface of the base plate 51. When a plurality of heat exchange plate groups 50 are staggered and overlapped, the step surface on the bottom surface of the base plate 51 is buckled into the bottom plate 51 trough in another heat exchange plate group 50, and the step surface on the bottom surface of the base plate 51 is abutted against the heat dissipating fins 57 on the cover plate 54 in the heat exchange plate group 50, so that the gaps between the heat dissipating fins 57 form a first medium cavity for the circulation of the first medium. A connecting pipe 55 is fixed at one corner of the cover plate 54. The upper end of the connecting pipe 55 is connected to the first medium cavity, and the lower end passes through the base plate 51. For example Figure 5 and Figure 6 As shown, when multiple heat exchange plate groups 50 are staggered and stacked, the lower end of the connecting pipe 55 is directly connected to the first medium cavity in another adjacent heat exchange plate group 50, so that the second medium cavities in each heat exchange plate group 50 are connected in series to form a flow channel.
[0032] During operation, the heat exchange plate groups 50 are stacked to form the heat exchanger 5; the uppermost liquid inlet pipe 52 and the lowermost liquid outlet pipe 53 of the heat exchanger 5 are connected in series to the flow channel of the second medium; the uppermost connecting pipe 55 and the lowermost connecting pipe 55 of the heat exchanger 5 are connected in series to the flow channel of the first medium; the first medium and the second medium complete heat exchange between the heat exchange plate groups 50.
[0033] In this embodiment, a circuitous flow groove is provided on the bottom plate, which increases the flow path length of the second medium within the heat exchange plate assembly, allowing the second medium more time to exchange heat with the first medium, thereby improving heat exchange efficiency. The cover plate has inclined heat dissipation fins on the side, which increase the contact area with the first medium and further enhance the heat exchange effect, enabling faster and more efficient heat transfer and improving overall heat exchange performance. The cover plate is embedded in the bottom plate groove and welded around the perimeter to form an integrated structure, ensuring a tight seal between the cover plate and the bottom plate, preventing leakage of the second medium, which is usually a refrigerant and requires high sealing performance. The heat exchanger consists of multiple heat exchange plate groups stacked 180 degrees apart. This compact arrangement increases the heat exchange area within a limited space, making the overall structure more compact and allowing for flexible adjustment based on demand. The stepped surface of the base plate and the cooling fins of the adjacent heat exchange plate group covers cleverly form the first medium cavity, eliminating the need for complex structures to create a medium flow channel and reducing heat exchanger costs.
[0034] Example 3: Based on the above embodiment 1 or 2, combined with Figure 7 As shown, this embodiment provides a diesel generator heating method, comprising the following steps: When the temperature at the inlet of the first working medium in the electric heating device 3, that is, the temperature detected by the second temperature sensor 31, is lower than T1, the second controller 32 controls the water pump 2 to start. In this embodiment, T1 is 15°C. When the temperature at the inlet of the first working medium in the heat exchanger 5 is equal to or higher than T3, the water pump 2 is turned off after a delay of 30 seconds. In this embodiment, T3 is 40°C. When the temperature at the inlet of the first working medium in the electric heating device 3, that is, the temperature detected by the second temperature sensor 31, is lower than T1, the second controller 32 controls the electric heating device 3 to start after a 30-second delay, and directly heats the first working medium through the electric heating device 3, thereby rapidly increasing the temperature of the first working medium and thus rapidly increasing the temperature of the diesel generator; when the temperature at the inlet of the first working medium in the electric heating device 3 is equal to or higher than T2, the electric heating device 3 is turned off. In this embodiment, T2 is 20°C. When the temperature at the inlet of the first working medium in the heat exchanger 5, that is, the temperature detected by the first temperature sensor 51, is equal to or higher than T2, the first controller 52 controls the heat pump 4 to delay 30 seconds to start the heating mode. The heat pump 4 transfers heat to the plate heat exchanger through the second working medium, and then exchanges heat with the first working medium to achieve the purpose of heating the first working medium. This heating method is stable and efficient. When the temperature at the inlet of the first working medium in the heat exchanger 5 is equal to or higher than T3, the heat pump 4 is turned off, so that the temperature of the first working medium is always maintained between 20°C and 40°C.
[0035] In this embodiment, when the heat pump 4 detects defrost conditions and enters the defrost state, the water pump 2 and the electric heater 3 start or remain in operation, and the heat pump 4 continues to provide heat without stopping. When the heat pump 4 reaches the defrost exit condition, the electric heater 3 stops operating. When the heat pump 4 is stopped, the defrost condition is not detected, and defrosting does not occur.
[0036] In this embodiment, the working range of the electric heating device 3 is set to start when the temperature is lower than 15°C and stop when the temperature is higher than 20°C. When the heat pump 4 or the heat exchanger 5 fails or the temperature of the first working medium is lower than 15 degrees, the electric heating device 3 and the water pump 2 can be started in time to ensure system safety.
[0037] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.
Claims
1. A diesel generator heating device, characterized in that: include: A circulation pipeline (1) is installed on the diesel generator and is used to heat the diesel generator; A water pump (2), an electric heating device (3) and a heat exchanger (5) are all connected in series in the circulation pipeline (1); The heat exchanger (5) is connected to the heat pump (4), and the second working medium in the heat pump (4) and the first working medium in the circulation pipeline (1) exchange heat in the heat exchanger (5).
2. A diesel generator heating device according to claim 1, characterized in that: A first temperature sensor (51) is provided at the inlet of the first working medium in the heat exchanger (5), and the first temperature sensor (51) is electrically connected to a first controller (52). The first controller (52) controls the connection between the heat pump (4) and the water pump (2).
3. A diesel generator heating device according to claim 1, characterized in that: A second temperature sensor (31) is provided at the inlet of the first working medium in the electric heating device (3), the second temperature sensor (31) is electrically connected to a second controller (32), and the second controller (32) controls the connection between the electric heating device (3) and the water pump (2).
4. A diesel generator heating device according to claim 1, characterized in that: The electric heating device (3) is a fin-type heater; the heat pump (4) is an air-energy heat pump.
5. A diesel generator heating device according to claim 1, characterized in that: The heat exchanger (5) is a plate-type heat exchanger, and the heat exchanger (5) is formed by staggered and stacked multiple heat exchange plate groups (50); The heat exchange plate group (50) comprises: The bottom plate (51) has diagonal positions at both ends connected to a liquid inlet pipe (52) and a liquid outlet pipe (53) respectively; A cover plate (54) covers the bottom plate (51); a sealed second medium cavity is formed between the cover plate (54) and the bottom plate (51); when a plurality of heat exchange plate groups (50) are staggered and stacked, a sealed first medium cavity is formed between the cover plate (54) and the bottom plate (51) of another adjacent heat exchange plate group (50); A connecting pipe (55) is fixed at a corner of the cover plate (54), one end of the connecting pipe (55) is connected to the first medium cavity, and the other end passes through the bottom plate (51); when multiple heat exchange plate groups (50) are staggered and stacked, one end of the connecting pipe (55) passes through the bottom plate (51) and is connected to the first medium cavity in another adjacent heat exchange plate group (50); One end of the liquid inlet pipe (52) is connected to the second medium cavity, and the other end passes through the cover plate (54); one end of the liquid outlet pipe (53) is connected to the second medium cavity, and the other end passes through the bottom plate (51); when multiple heat exchange plate groups (50) are staggered and overlapped, the liquid outlet pipe (53) is connected to the liquid inlet pipe (52) in another adjacent heat exchange plate group (50).
6. A diesel generator heating device according to claim 5, characterized in that: A winding flow groove (56) is provided on one side of the bottom plate (51) close to the cover plate (54), and the two ends of the flow groove (56) are respectively connected to the liquid inlet pipe (52) and the liquid outlet pipe (53); when the cover plate (54) covers the bottom plate (51), the flow groove (56) forms the second medium cavity; A side of the cover plate (54) away from the bottom plate (51) is provided with inclined heat dissipation fins (57); when a plurality of heat exchange plate groups (50) are staggered and stacked, the gaps between the heat dissipation fins (57) form the first medium cavity.
7. A diesel generator heating method, using a diesel generator heating device according to any one of claims 1 to 6, characterized in that: The steps include: When the temperature at the inlet of the first working medium in the electric heating device (3) is lower than T1, the water pump (2) is started; when the temperature at the inlet of the first working medium in the heat exchanger (5) is higher than T3, the water pump (2) is shut down; When the temperature at the inlet of the first working medium in the electric heating device (3) is lower than T1, the electric heating device (3) is delayed to start; when the temperature at the inlet of the first working medium in the electric heating device (3) is higher than T2, the electric heating device (3) is turned off; When the temperature at the inlet of the first working medium in the heat exchanger (5) is higher than T2, the heat pump (4) is delayed to start; when the temperature at the inlet of the first working medium in the heat exchanger (5) is higher than T3, the heat pump (4) is shut down; T1<T2<T3.
8. A diesel generator heating method according to claim 7, characterized in that: When the heat pump (4) enters the defrosting state, the water pump (2) and the electric heating device (3) are started.
9. A diesel generator heating method according to claim 7, characterized in that: The T1 is 15°C, T2 is 20°C, and T3 is 40°C.
10. A diesel generator heating method according to claim 7, characterized in that: The delay time for delayed start of the electric heating device (3) and the heat pump (4) is 30 seconds.