Exhaust cooling device for explosion-proof diesel engine

Abstract

The invention discloses an exhaust cooling device for an explosion-proof diesel engine, and relates to the technical field of explosion-proof diesel engines, the exhaust cooling device comprises an explosion-proof diesel engine body, a waste gas treatment box, an electric control box and a variable frequency water pump, a water-cooling exhaust manifold is fixedly connected to an exhaust port of the explosion-proof diesel engine body, and a water-cooling supercharger is mounted on the water-cooling exhaust manifold; an exhaust corrugated pipe is fixedly connected to the water cooling supercharger, one end of the exhaust corrugated pipe is communicated with the waste gas treatment box, a temperature sensor is arranged in the waste gas treatment box, and a controller used for controlling the variable frequency water pump to operate is arranged in the electric control box. According to the exhaust cooling device for the explosion-proof diesel engine, it is guaranteed that an exhaust system of the explosion-proof diesel engine is efficiently cooled, it is guaranteed that the engine is used at the normal temperature, and it is guaranteed that a tail gas purifier of the exhaust system efficiently works; and the emission of harmful gas during working of the engine under the mine is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof diesel engines, and in particular to an exhaust cooling device for explosion-proof diesel engines. Background Art

[0002] Explosion-proof diesel engine rubber-tyred trackless vehicles are required by regulations to have a maximum surface temperature of no more than 150°, an exhaust temperature of no more than 70°C, and a water temperature of no more than 95°C. When a diesel engine is running normally, the exhaust system temperature reaches 650°C. The exhaust system of current market products consists of a water-cooled exhaust manifold, a water-cooled supercharger, a water-cooled exhaust bellows, and a water-cooled exhaust gas purification device. The cooling water circulation of the exhaust system is driven by the engine water pump or by the boiling of its own cooling water. The cooling system has no control capability. When the vehicle is running at low load, the engine runs at low temperature, the engine power is reduced, and carbon is deposited in the cylinder. When the vehicle is climbing a slope continuously at full load, the water temperature will exceed the limit, which will cause the temperature to exceed the standard, and the vehicle system protection will cause shutdown. At the same time, there are safety risks in explosive environments.

[0003] In addition, with the improvement of emission requirements for explosion-proof diesel trackless rubber-tyred vehicles, the vehicle adds a carbon monoxide purification device on the basis of the original National III. The purification device carrier is coated with platinum (Pt), palladium (Pd), and rhodium (Pd) precious metals. Carbon monoxide (CO) and hydrocarbons (HC) in the engine exhaust will be oxidized into carbon dioxide (CO2) and water (H2O). The optimal exhaust temperature of the carbon monoxide purification device is 200-300 degrees Celsius when it is working. When the temperature is lower than the range, the efficiency is reduced. When the temperature is higher than the range, the sulfide in the exhaust gas will gradually poison the purification device and permanently reduce the catalytic efficiency. The oxidation process of the purification device when purifying the exhaust gas is an exothermic reaction, and cooling the engine exhaust again puts forward cooling control requirements. For this reason, we propose an exhaust cooling device for explosion-proof diesel engines. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies of the prior art, the present invention provides an exhaust cooling device for an explosion-proof diesel engine to solve the above-mentioned technical problems.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] An exhaust cooling device for an explosion-proof diesel engine comprises an explosion-proof diesel engine body, an exhaust gas treatment box, an electric control box and a variable frequency water pump, wherein a water-cooled exhaust manifold is fixedly connected to the exhaust port of the explosion-proof diesel engine body, a water-cooled supercharger is installed on the water-cooled exhaust manifold, an exhaust bellows is fixedly connected to the water-cooled supercharger, one end of the exhaust bellows is connected to the exhaust gas treatment box, a temperature sensor is arranged inside the exhaust gas treatment box, a controller for controlling the operation of the variable frequency water pump is arranged inside the electric control box, and a water-cooled exhaust gas purification device and a carbon monoxide purification device are arranged inside the exhaust gas treatment box.

[0009] Preferably: a filter element is arranged in the water-cooled exhaust gas purification device, and the exhaust system consisting of the water-cooled exhaust bellows, the water-cooled exhaust gas purification device and the carbon monoxide purification device is independent of the cooling system of the explosion-proof diesel engine body, and a separately arranged explosion-proof variable frequency water pump is used to provide circulating cooling power for the exhaust system.

[0010] Preferably: the temperature sensor is located at the air inlet of the exhaust gas purification device and is used to detect the intake temperature. The exhaust bellows surface temperature, exhaust temperature and exhaust gas purification device inlet temperature signals are connected to the controller, and the controller can automatically adjust the speed of the variable frequency water pump according to temperature changes.

[0011] Preferably: the controller controls the speed of the variable frequency water pump to be adjusted within the range of 1400-3400r / min, and the controller controls the temperature of the air flow entering the carbon monoxide purification device to be 200-300°C to ensure catalytic efficiency and service life. The explosion-proof diesel engine body is cooled together with the water-cooled exhaust manifold and the water-cooled supercharger to ensure that the explosion-proof diesel engine body quickly heats up and prevents low-temperature operation.

[0012] (III) Beneficial effects

[0013] 1. Separate the water-cooled exhaust bellows, water-cooled exhaust gas purification device and carbon monoxide purification device of the exhaust system of the explosion-proof diesel engine from the cooling of the explosion-proof diesel engine, add an explosion-proof variable frequency water pump to provide circulation power for the separate cooling of this part, install a temperature sensor at the air inlet of the exhaust gas purification device, connect the exhaust bellows surface temperature, exhaust temperature and purification device inlet temperature signals to the controller, the controller controls the variable frequency water pump, automatically adjusts and controls the water pump speed to increase when the temperature rises, increases the cooling capacity, ensures that the temperature does not exceed the limit required by various regulations when working continuously at high load, and at the same time ensures that the air flow temperature entering the carbon monoxide purification is 200-300℃, ensures the catalytic efficiency and service life. The exhaust cooling device for explosion-proof diesel engines ensures efficient cooling of the exhaust system of the explosion-proof diesel engine, ensures that the engine is used at normal temperature, ensures that the exhaust system exhaust purifier works efficiently, and reduces the emission of harmful gases when the engine is working in the mine.

[0014] 2. Connect the explosion-proof diesel engine body with the water-cooled exhaust manifold and water-cooled supercharger in series to ensure that the explosion-proof diesel engine body quickly warms up, prevents low-temperature operation, improves engine power, and extends service life. The exhaust system cooling is separated, which makes it easier to troubleshoot problems. The system can be disassembled and repaired separately to improve maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0016] Figure 1 The figure is a structural diagram of the exhaust gas cooling device for explosion-proof diesel engines according to the present invention.

[0017] Legend: 1. Explosion-proof diesel engine body; 2. Water-cooled exhaust manifold; 3. Water-cooled supercharger; 4. Exhaust bellows; 5. Filter element; 6. Temperature sensor; 7. Exhaust gas treatment box; 8. Electronic control box; 9. Variable frequency water pump. DETAILED DESCRIPTION

[0018] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] Embodiment: Figure 1As shown, in view of the problems existing in the prior art, the present invention provides an exhaust cooling device for an explosion-proof diesel engine, comprising an explosion-proof diesel engine body 1, an exhaust gas treatment box 7, an electric control box 8 and a variable frequency water pump 9, a water-cooled exhaust manifold 2 is fixedly connected to the exhaust port of the explosion-proof diesel engine body 1, a water-cooled supercharger 3 is installed on the water-cooled exhaust manifold 2, an exhaust bellows 4 is fixedly connected to the water-cooled supercharger 3, one end of the exhaust bellows 4 is connected to the exhaust gas treatment box 7, a temperature sensor 6 is arranged inside the exhaust gas treatment box 7, a controller for controlling the operation of the variable frequency water pump 9 is arranged inside the electric control box 8, a water-cooled exhaust gas purification device and a carbon monoxide purification device are arranged inside the exhaust gas treatment box 7, and a filter element 5 is arranged in the water-cooled exhaust gas purification device The exhaust system composed of the water-cooled exhaust bellows 4, the water-cooled exhaust gas purification device, and the carbon monoxide purification device is independent of the cooling system of the explosion-proof diesel engine body 1. A separately arranged explosion-proof variable frequency water pump 9 provides circulating cooling power for the exhaust system. The temperature sensor 6 is located at the air inlet of the exhaust gas purification device to detect the intake temperature. The surface temperature of the exhaust bellows 4, the exhaust temperature, and the inlet temperature signal of the exhaust gas purification device are connected to the controller. The controller can automatically adjust the speed of the variable frequency water pump 9 according to the temperature change. The controller controls the speed of the variable frequency water pump 9 to be adjusted within the range of 1400-3400r / min. The controller controls the air flow temperature entering the carbon monoxide purification device to be 200-300℃ to ensure the catalytic efficiency and use The explosion-proof diesel engine body 1 is cooled together with the water-cooled exhaust manifold 2 and the water-cooled supercharger 3 to ensure that the explosion-proof diesel engine body 1 is quickly heated up and prevented from running at low temperatures. The explosion-proof diesel engine body 1 is cooled together with the water-cooled exhaust manifold 2 and the water-cooled supercharger 3 to ensure that the explosion-proof diesel engine body 1 is quickly heated up and prevented from running at low temperatures. The cooling of the water-cooled exhaust bellows 4, the water-cooled exhaust gas purification device and the carbon monoxide purification device of the exhaust system of the explosion-proof diesel engine body 1 are separated from the cooling of the explosion-proof diesel engine body 1, and an explosion-proof variable frequency water pump 9 is added to provide circulation power for the separate cooling of this part. A temperature sensor 6 is installed at the air inlet position of the exhaust gas purification device to connect the surface temperature of the exhaust bellows 4, the inlet temperature of the purification device and the exhaust temperature signal To the controller, the controller controls the variable frequency water pump 9 (1400-3400r / min), and automatically adjusts the water pump speed to increase when the temperature rises, increases the cooling capacity, and ensures that the surface temperature and exhaust temperature do not exceed the limit when working continuously at high load. When the engine is running at low load, the controller automatically controls the water pump speed to decrease when the surface temperature and exhaust temperature are low. In both states, the air flow temperature entering the carbon monoxide purification device is controlled at 200-300℃ while ensuring that the limit is not exceeded, to ensure catalytic efficiency and service life. The temperature control threshold can be set by yourself to adapt to the hardware layout of different vehicle models. The default surface temperature controls the water pump speed increase threshold of 140℃, the exhaust temperature controls the water pump threshold of 65℃, the low surface temperature threshold is 80℃, and the low exhaust temperature threshold is 50℃.

[0020] Working principle:

[0021] The first step is to cool the explosion-proof diesel engine body 1 together with the water-cooled exhaust manifold 2 and the water-cooled supercharger 3 to ensure that the explosion-proof diesel engine body 1 quickly heats up and prevents low-temperature operation. The water-cooled exhaust bellows 4, the water-cooled exhaust gas purification device and the carbon monoxide purification device of the exhaust system of the explosion-proof diesel engine body 1 are separated from the cooling of the explosion-proof diesel engine body 1. An explosion-proof variable frequency water pump 9 is added to provide circulation power for the separate cooling of this part. A temperature sensor 6 is installed at the air inlet position of the exhaust gas purification device. The surface temperature of the exhaust bellows 4, the inlet temperature of the purification device and the exhaust temperature signal are connected to the controller. The controller controls the variable frequency water pump 9 (1400-3400r / min), when the temperature rises, the water pump speed is automatically adjusted to increase, thereby increasing the cooling capacity and ensuring that the surface temperature and exhaust temperature do not exceed the limit when the engine is working continuously at high load. When the engine is running at low load, the controller automatically controls the water pump speed to decrease when the surface temperature and exhaust temperature are low. In both states, the air flow temperature entering the carbon monoxide purification device is controlled at 200-300°C while ensuring that the limit is not exceeded, thereby ensuring the catalytic efficiency and service life. The temperature control threshold can be set by yourself to adapt to the hardware layout of different models. The default surface temperature control water pump speed increase threshold is 140°C, the exhaust temperature control water pump threshold is 65°C, the low surface temperature threshold is 80°C, and the low exhaust temperature threshold is 50°C.

[0022] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. An exhaust cooling device for an explosion-proof diesel engine, comprising an explosion-proof diesel engine body (1), an exhaust gas treatment box (7), an electric control box (8) and a variable frequency water pump (9), characterized in that: A water-cooled exhaust manifold (2) is fixedly connected to the exhaust port of the explosion-proof diesel engine body (1), a water-cooled supercharger (3) is installed on the water-cooled exhaust manifold (2), an exhaust bellows (4) is fixedly connected to the water-cooled supercharger (3), and one end of the exhaust bellows (4) is connected and communicated with an exhaust gas treatment box (7); The exhaust gas treatment box (7) is provided with a temperature sensor (6), the electric control box (8) is provided with a controller for controlling the operation of the variable frequency water pump (9), and the exhaust gas treatment box (7) is provided with a water-cooled exhaust gas purification device and a carbon monoxide purification device.

2. The exhaust cooling device for an explosion-proof diesel engine according to claim 1, characterized in that: A filter element (5) is arranged in the water-cooled tail gas purification device.

3. The exhaust cooling device for an explosion-proof diesel engine according to claim 2, characterized in that: The exhaust system composed of the water-cooled exhaust bellows (4), the water-cooled tail gas purification device, and the carbon monoxide purification device is independent of the cooling system of the explosion-proof diesel engine body (1), and a separately arranged explosion-proof variable frequency water pump (9) provides circulating cooling power for the exhaust system.

4. The exhaust cooling device for an explosion-proof diesel engine according to claim 3, characterized in that: The temperature sensor (6) is located at the air inlet of the exhaust gas purification device and is used to detect the air inlet temperature.

5. The exhaust cooling device for an explosion-proof diesel engine according to claim 4, characterized in that: The exhaust bellows (4) surface temperature, exhaust gas temperature, and exhaust gas purification device inlet temperature signals are connected to a controller, and the controller can automatically adjust the speed of the variable frequency water pump (9) according to temperature changes.

6. The exhaust cooling device for an explosion-proof diesel engine according to claim 5, characterized in that: The controller controls the speed of the variable frequency water pump (9) to be adjusted within the range of 1400-3400 r / min.

7. The exhaust cooling device for an explosion-proof diesel engine according to claim 6, characterized in that: The controller controls the temperature of the airflow entering the carbon monoxide purification device to be between 200° C. and 300° C. to ensure the catalytic efficiency and service life.

8. The exhaust cooling device for an explosion-proof diesel engine according to claim 7, characterized in that: The explosion-proof diesel engine body (1) is cooled together with the water-cooled exhaust manifold (2) and the water-cooled supercharger (3) to ensure that the explosion-proof diesel engine body (1) is quickly heated up and prevent low-temperature operation.

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