Power measuring machine rack heat energy recycling system

Abstract

The invention discloses a dynamometer rack heat energy recycling system, and relates to the technical field of vehicle engines. The system comprises an engine, a first temperature sensor, a proportional three-way control valve, a circulating water pump, an electric heater, a heat exchange plate, a cooling water tower, a first pneumatic valve, a second temperature sensor, a first differential pressure sensor, a proportional control valve, a cooling fan, an air cooling exchanger, a second differential pressure sensor, a third temperature sensor and a second pneumatic valve, the environment temperature sensor and the controller are used for cooling heat energy generated by the engine, and releasing the generated heat energy to a laboratory office area through a fan cooling coil, so that the temperature of the office area is proper, the office area is heated in winter, the load capacity of cooling circulating water of the engine is reduced, and the heating cost of the laboratory is reduced; the heating power of electric heating equipment due to low environment temperature of an office area is reduced or cancelled, and the comfort level of staff is improved.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle engines, and in particular to a dynamometer bench heat energy recovery and reuse system. Background Art

[0002] When the engine is undergoing reliability testing, it needs to run at high power for 24 hours, which will generate a lot of heat. In order to ensure that the engine can work normally, an engine coolant thermostat is required, as shown in the attached Figure 1 As shown, when the reliability test of the engine 1 is performed, the first temperature sensor 4 at the engine coolant outlet 2 detects that the water temperature is high. After being adjusted by the proportional three-way regulating valve 5, part of the engine coolant dissipates heat through the heat exchange plate 8, and at the same time, part of the engine coolant enters the cooling water tower 9 through the cold circulating water inlet 10, enters the circulating water pump 6 through the cold circulating water outlet 11, and then enters the engine 1 through the engine coolant inlet 3. The cooling circulating water is used to take away the generated heat, realize the cooling function, and ensure that the engine reliability test is carried out normally. In the process of cooling, a large amount of heat energy is taken away by the circulating water and released into the air in the form of the cooling water tower, which increases the load of the cooling circulating water and causes a large amount of heat energy waste. About 30% of the energy can be effectively converted into mechanical work, and the remaining 60% to 70% of the energy is lost through heat dissipation or exhaust. Therefore, the potential benefits of heat recovery and utilization are huge.

[0003] The document (CN 115059552 A) discloses an engine heat recovery system and a heat recovery power generation method, which includes an engine, a heat exchanger, an evaporator, a generator and a condenser; the engine is connected to the heat exchanger through a first pipeline, so that the coolant in the engine enters the heat exchanger for heat exchange; the heat exchanger is connected to the evaporator through a second pipeline, so that the heat of the coolant after heat exchange is transferred to the working medium in the evaporator; the evaporator is connected to the generator through a third pipeline, so that the working medium that absorbs heat and vaporizes enters the generator for power generation; the generator is connected to the condenser through a fourth pipeline, so that the working medium flowing out of the generator is liquefied; the condenser is connected to the evaporator through a fifth pipeline, so that the liquefied working medium flows into the evaporator. Although it can recover heat energy, the utilization effect is not obvious. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention conceives a dynamometer bench heat energy recovery and reuse system, which adopts proportional control valves and temperature sensors to automatically control the temperature, extracts heat energy during the operation of the engine, and uses it for heating the office area of ​​the laboratory to meet the normal operation of the test equipment.

[0005] The technical solution adopted to realize the present invention is: a dynamometer bench heat energy recovery and reuse system, which includes: an engine 1, a first temperature sensor 4, a proportional three-way regulating valve 5, a circulating water pump 6, an electric heater 7, a heat exchange plate 8, and a cooling water tower 9, characterized in that it also includes: a first pneumatic valve 12, a second temperature sensor 13, a first pressure difference sensor 14, a proportional regulating valve 15, an air-cooled exchanger 17, a second pressure difference sensor 18, a third temperature sensor 19, a second pneumatic valve 20, an ambient temperature sensor 21 and a controller 22, a first pneumatic valve 12 is arranged on the closed pipeline between the first temperature sensor 4 and the proportional three-way regulating valve 5, and a second pneumatic valve 20 is arranged on the water inlet pipeline of the circulating water pump 6, the first pneumatic valve 12, the proportional regulating valve 15 and the second pneumatic valve 20 are connected in series through a closed pipeline, and the The proportional regulating valve 15 is connected in parallel with the air-cooled exchanger 17 through a closed pipeline. A first differential pressure sensor 14 and a second temperature sensor 13 are sequentially arranged on the upper closed pipeline between the air-cooled exchanger 17 and the proportional regulating valve 15, a second differential pressure sensor 18 is arranged on the lower closed pipeline between the air-cooled exchanger 17 and the proportional regulating valve 15, a third temperature sensor 19 is arranged on the closed pipeline between the proportional regulating valve 15 and the second pneumatic valve 20, and the ambient temperature sensor 21 is arranged in the office area of ​​the laboratory. The controller 22 is electrically connected to the first temperature sensor 4, the proportional three-way regulating valve 5, the circulating water pump 6, the electric heater 7, the second temperature sensor 13, the first differential pressure sensor 14, the proportional regulating valve 15, the air-cooled exchanger 17, the second differential pressure sensor 18, the third temperature sensor 19 and the ambient temperature sensor 21 respectively.

[0006] Furthermore, it also includes: a heat dissipation fan 16 , and a heat dissipation fan 16 is arranged on the air-cooling exchanger 17 .

[0007] Furthermore, the proportional three-way regulating valve 5 comprises: a driver and a valve body. The driver is driven by a synchronous motor and has spring reset and manual valve opening lever operation functions. The valve body adopts a piston structure.

[0008] Furthermore, the circulating water pump 6 is driven by a DC motor.

[0009] Furthermore, the heat exchange plate 8 is a fluid-connected indirect heat exchanger.

[0010] Furthermore, the output variation of the first differential pressure sensor 14 and the second differential pressure sensor 18 is less than 0.1% FS within the mechanical vibration frequency range of 20 Hz to 1000 Hz.

[0011] Furthermore, the ambient temperature sensor 21 is a non-contact temperature measuring instrument.

[0012] Furthermore, the controller 22 is a PAC controller.

[0013] The beneficial effects of the heat energy recovery and reuse system of the dynamometer bench of the present invention are embodied in:

[0014] A dynamometer bench heat energy recovery and reuse system cools the heat energy generated by the engine and releases the generated heat energy to the office area of ​​the laboratory through the fan cooling coil, thereby ensuring the appropriate temperature of the office area, achieving heating of the office area in winter, reducing the load of the engine cooling circulating water, reducing the heating cost of the laboratory, reducing or eliminating the heating power of electric heating equipment due to the low ambient temperature of the office area, and improving the comfort of employees. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the principle diagram of the thermal energy circulation system of the existing dynamometer bench;

[0016] Figure 2 It is a schematic diagram of the heat recovery and reuse system of a dynamometer bench;

[0017] In the figure: 1. engine, 2. engine coolant outlet, 3. engine coolant inlet, 4. first temperature sensor, 5. proportional three-way regulating valve, 6. circulating water pump, 7. electric heater, 8. heat exchange plate, 9. cooling water tower, 10. cold circulating water inlet, 11. cold circulating water outlet, 12. first pneumatic valve, 13. second temperature sensor, 14. first differential pressure sensor, 15. proportional regulating valve, 16. cooling fan, 17. air cooling exchanger, 18. second differential pressure sensor, 19. third temperature sensor, 20. second pneumatic valve, 21. ambient temperature sensor, 22. controller. DETAILED DESCRIPTION

[0018] The following is combined with Figure 2 The specific implementation manner will further describe the present invention in detail. To make the purpose, technical scheme and advantages of the implementation manner clearer, the technical scheme in the implementation manner will be clearly and completely described in combination with the embodiments of the present invention. The specific implementation manner described here is only used to explain the present invention and is not used to limit the scope of the present invention.

[0019] As attached Figure 2As shown, a dynamometer bench heat energy recovery and reuse system comprises: an engine 1, a first temperature sensor 4, a proportional three-way regulating valve 5, a circulating water pump 6, an electric heater 7, a heat exchange plate 8, a cooling water tower 9, a first pneumatic valve 12, a second temperature sensor 13, a first pressure difference sensor 14, a proportional regulating valve 15, a cooling fan 16, an air cooling exchanger 17, a second pressure difference sensor 18, a third temperature sensor 19, a second pneumatic valve 20, an ambient temperature sensor 21 and a controller 22, wherein the proportional three-way regulating valve 5 comprises: a driver and a valve body, the driver The actuator is driven by a synchronous motor and has spring reset and manual valve opening lever operation functions. The valve body adopts a piston structure. A first pneumatic valve 12 is arranged on the closed pipeline between the first temperature sensor 4 and the proportional three-way regulating valve 5, and a second pneumatic valve 20 is arranged on the water inlet pipeline of the circulating water pump 6. The first pneumatic valve 12, the proportional regulating valve 15 and the second pneumatic valve 20 are connected in series through a closed pipeline. The proportional regulating valve 15 is connected in parallel with the air-cooled exchanger 17 through a closed pipeline. A cooling fan 16 is arranged on the air-cooled exchanger 17 A first differential pressure sensor 14 and a second temperature sensor 13 are sequentially arranged on the upper sealed pipeline between the air-cooled exchanger 17 and the proportional regulating valve 15, a second differential pressure sensor 18 is arranged on the lower sealed pipeline between the air-cooled exchanger 17 and the proportional regulating valve 15, a third temperature sensor 19 is arranged on the sealed pipeline between the proportional regulating valve 15 and the second pneumatic valve 20, the ambient temperature sensor 21 is arranged in the office area of ​​the laboratory, and the controller 22 is respectively connected to the first temperature sensor 4, the proportional three-way regulating valve 5, the circulating water pump 6, the electric heater 7, the second temperature sensor 21, the ambient ... The sensor 13, the first differential pressure sensor 14, the proportional control valve 15, the air-cooled exchanger 17, the second differential pressure sensor 18, the third temperature sensor 19 and the ambient temperature sensor 21 are electrically connected. The circulating water pump 6 is driven by a DC motor. The heat exchange plate 8 is a fluid-connected indirect heat exchanger. The output change of the first differential pressure sensor 14 and the second differential pressure sensor 18 is less than 0.1% FS within the mechanical vibration frequency of 20 Hz to 1000 Hz. The ambient temperature sensor 21 is a non-contact temperature measuring instrument, and the controller 22 is a PAC controller.

[0020] Working process of a dynamometer bench heat energy recovery and reuse system:

[0021] During the reliability test of the engine 1, when the outlet water temperature of the engine coolant is high, the engine coolant passes through the first temperature sensor 4, the proportional three-way regulating valve 5, and the heat exchange plate 8 from the engine coolant outlet 2, and then enters the cooling water tower 9 through the cold circulating water inlet 10 to release heat to the air to achieve cooling. The engine coolant passes through the cold circulating water outlet 11, and then is pressurized by the circulating water pump 6, and flows through the engine coolant inlet through the internal cooling circuit of the engine 1; when the controller 22 detects that the temperature of the engine coolant is high through the first temperature sensor 4, the first pneumatic valve 12 and the second pneumatic valve 20 are opened, and the supply and return water pressure difference and the outlet water temperature of the air-cooled exchanger 17 are adjusted through the proportional regulating valve 15, and the supply and return water temperature difference is monitored through the second temperature sensor 13 and the third temperature sensor 19 to ensure that the outlet water temperature of the water supply engine coolant meets the test control requirements. If the outlet water temperature is low, it is necessary to control the proportional regulating valve 15 to make it fully open to prevent the air-cooled radiator from dissipating too much heat, resulting in too low outlet water temperature;

[0022] At the same time, the controller 22 controls the opening of the proportional three-way regulating valve 5 according to the temperature of the first temperature sensor 4, thereby achieving cooling through the heat exchange plate 8. When the program determines that the electric heater 7 needs to be turned on, the controller 22 automatically closes the first pneumatic valve 12 and the second pneumatic valve 20 to reduce heat loss. When the ambient temperature sensor 21 detects that the temperature in the office area is high, the controller 22 automatically closes the first pneumatic valve 12 and the second pneumatic valve 20 according to the stability of the first differential pressure sensor 14 and the second differential pressure sensor, thereby reducing heat loss and achieving effective use of energy.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A dynamometer bench heat energy recovery and reuse system, comprising: An engine (1), a first temperature sensor (4), a proportional three-way regulating valve (5), a circulating water pump (6), an electric heater (7), a heat exchange plate (8), and a cooling water tower (9), characterized in that it also includes: a first pneumatic valve (12), a second temperature sensor (13), a first differential pressure sensor (14), a proportional regulating valve (15), an air-cooled exchanger (17), a second differential pressure sensor (18), a third temperature sensor (19), a second pneumatic valve (20), an ambient temperature sensor (21), and a controller (22); a first pneumatic valve (12) is arranged on a sealed pipeline between the first temperature sensor (4) and the proportional three-way regulating valve (5); a second pneumatic valve (20) is arranged on a water inlet pipeline of the circulating water pump (6); the first pneumatic valve (12), the proportional regulating valve (15), and the second pneumatic valve (20) are connected in series through a sealed pipeline; the proportional regulating valve (15) and the air-cooled exchanger (17) are connected in series with each other; 7) are connected in parallel through closed pipelines, a first differential pressure sensor (14) and a second temperature sensor (13) are sequentially arranged on the upper closed pipeline between the air-cooled exchanger (17) and the proportional control valve (15), a second differential pressure sensor (18) is arranged on the lower closed pipeline between the air-cooled exchanger (17) and the proportional control valve (15), a third temperature sensor (19) is arranged on the closed pipeline between the proportional control valve (15) and the second pneumatic valve (20), the ambient temperature sensor (21) is arranged in the office area of ​​the laboratory, and the controller (22) is electrically connected to the first temperature sensor (4), the proportional three-way control valve (5), the circulating water pump (6), the electric heater (7), the second temperature sensor (13), the first differential pressure sensor (14), the proportional control valve (15), the air-cooled exchanger (17), the second differential pressure sensor (18), the third temperature sensor (19) and the ambient temperature sensor (21), respectively.

2. The dynamometer bench heat energy recovery and reuse system according to claim 1 is characterized in that: It also includes a heat dissipation fan (16), and the heat dissipation fan (16) is arranged on the air-cooling exchanger (17).

3. The dynamometer bench heat energy recovery and reuse system according to claim 1 is characterized in that: The proportional three-way regulating valve (5) comprises: a driver and a valve body, wherein the driver is driven by a synchronous motor and has spring reset and manual valve opening lever operation functions, and the valve body adopts a piston structure.

4. The dynamometer bench heat energy recovery and reuse system according to claim 1 is characterized in that: The circulating water pump (6) is driven by direct current.

5. The dynamometer bench heat energy recovery and reuse system according to claim 1 is characterized in that: The heat exchange plate (8) is a fluid-connected indirect heat exchanger.

6. The dynamometer bench heat energy recovery and reuse system according to claim 1 is characterized in that: The output variation of the first differential pressure sensor (14) and the second differential pressure sensor (18) is less than 0.1% FS within the mechanical vibration frequency range of 20 Hz to 1000 Hz.

7. The dynamometer bench heat energy recovery and reuse system according to claim 1 is characterized in that: The ambient temperature sensor (21) is a non-contact temperature measuring instrument.

8. The dynamometer bench heat energy recovery and reuse system according to claim 1 is characterized in that: The controller (22) is a PAC controller.

Images