Positive pressure cab air heating system and road roller

Abstract

The invention discloses a positive pressure cab air heating system and a road roller, the heating system comprises an air conditioner, a heat exchanger, a fuel oil heater, an engine and a positive pressure pressurization system, the air conditioner, the heat exchanger and the fuel oil heater form a first water circulation through a water flow pipeline, and the air conditioner, the heat exchanger and the engine form a second water circulation through a water flow pipeline; the heat exchanger and the engine form air circulation through a pipeline, the positive pressure pressurization system is connected with the air conditioner through an airflow pipeline, and the heat exchanger is located on the airflow pipeline. When the engine is not started, the air conditioning system is heated through the first water circulation where the fuel heater is located, and preheating of the cab environment is achieved; after the engine is started, the air conditioning system is heated through the second water circulation and the air circulation where the engine is located, and rapid heating of the cab environment is achieved; and supplemental gas of the positive pressure pressurization system is heated through the heat exchanger, so that the supplemental gas is prevented from entering the cab to reduce the indoor temperature, and the temperature of the cab can be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and particularly relates to a positive-pressure cab air heating system and a road roller. Background Art

[0002] In some mining areas with high altitudes, it is necessary to cope with extremely low ambient temperatures in winter. To ensure a warm operating environment in the cab, the current main cab heating methods are air-conditioning heating and electric heating, but each method has its own defects. (1) For air-conditioning heating, the heat dissipation circulating hot water of the engine is used, and the hot water heats the indoor air through the air-conditioning evaporator; however, when the engine is not started, the air in the cab cannot be heated; and due to the extremely low ambient temperature, the water temperature rises very slowly after the engine starts working, and the final temperature reached is not high, so the air in the cab cannot reach the ideal temperature. (2) Electric heating for heating is to heat the air in the cab by electric heating; however, the power of electric heating is relatively large, and the battery energy storage of the road roller is limited in the extremely cold environment. If it is used when the engine is not started, the battery will be damaged too much, affecting the starting ability of the engine; and when the road roller is working, the power of the generator is limited, and the power consumption of electric heating is too large, affecting the operation of other electrical appliances of the road roller.

[0003] In addition, due to the large amount of dust in the working environment, road rollers usually need to be equipped with a positive-pressure cab to prevent dust from entering the cab and affecting the comfort of the driving environment. The air supplemented into the cab by the positive-pressure boosting system is cold air, which further affects the heating effect in the cab. Summary of the Invention

[0004] Object of the Invention: Aiming at the above-mentioned disadvantages, the present invention provides a positive-pressure cab air heating system and a road roller, which can preheat the air in the cab before the engine is started, quickly heat the air after the engine is started, and realize the heating of the air supplemented by the positive-pressure boosting system, so as to improve the heating efficiency in multiple aspects.

[0005] Technical Solution: To solve the above problems, the present invention adopts a positive-pressure cab air heating system, which includes an air conditioner, a heat exchanger, a fuel heater, an engine, and a positive-pressure boosting system. The air conditioner, the heat exchanger, and the fuel heater form a first water cycle through a water flow pipeline. The air conditioner, the heat exchanger, and the engine form a second water cycle through a water flow pipeline. The heat exchanger and the engine form an air cycle through a pipeline. The positive-pressure boosting system is connected to the air conditioner through an air flow pipeline, and the heat exchanger is located on this air flow pipeline.

[0006] Furthermore, an engine exhaust pipe is provided on the engine, and the heat exchanger is connected to the engine exhaust pipe through a heat exchanger hot air inlet pipe and a heat exchanger hot air outlet pipe.

[0007] Further, a three-way valve is provided on the engine exhaust pipe, and the hot air inlet pipe of the heat exchanger is connected to the three-way valve.

[0008] Further, a muffler is connected to the tail end of the engine exhaust pipe.

[0009] Further, the heat exchanger is connected to the positive pressure supercharging system through the first air conditioner inlet pipe, and the heat exchanger is connected to the air conditioner through the second air conditioner inlet pipe.

[0010] Further, the engine is connected to the heat exchanger through the first air conditioner inlet water pipe, the heat exchanger is connected to the air conditioner through the second air conditioner inlet water pipe, and the air conditioner is also connected to the engine through the air conditioner return water pipe.

[0011] Further, the fuel heater is connected to the first air conditioner inlet water pipe through the fuel heater outlet water pipe, and the fuel heater is also connected to the air conditioner return water pipe through the fuel heater inlet water pipe.

[0012] Further, the heat exchanger includes a housing, air conditioner inlet pipe interfaces are provided on both sides of the housing, a layered water channel and a heat exchanger hot air pipe are provided inside the housing, air conditioner inlet water pipe interfaces are provided at both ends of the layered water channel, and heat exchanger hot air pipe interfaces are provided at both ends of the heat exchanger hot air pipe. The air conditioner inlet pipe interfaces are respectively connected to the first air conditioner inlet pipe and the second air conditioner inlet pipe, the air conditioner inlet water pipe interfaces are respectively connected to the first air conditioner inlet water pipe and the second air conditioner inlet water pipe, and the heat exchanger hot air pipe interfaces are respectively connected to the heat exchanger hot air inlet pipe and the heat exchanger hot air outlet pipe.

[0013] Further, the positive pressure supercharging system is a fresh air supercharger.

[0014] The present invention also provides a road roller including the above positive pressure cab air heating system.

[0015] Beneficial effects: Compared with the prior art, the remarkable advantages of the present invention are as follows: (1) The cab is heated through multiple circulating heat exchange lines, effectively improving the heating efficiency of the cab environment and ensuring the comfort of the cab; when the engine is not started, the first water cycle where the fuel heater is located heats the air conditioning system to preheat the cab environment; after the engine is started, the second water cycle and air cycle where the engine is located heat the air conditioning system to quickly heat the cab environment; and the supplementary gas of the positive pressure supercharging system is heated by the heat exchanger to prevent the supplementary gas from reducing the indoor temperature after entering the cab, which helps to increase the cab temperature; (2) Using the fuel heater for preheating does not consume too much battery power and does not affect the operation of the road roller engine and other electrical appliances; (3) Using the engine exhaust gas for heating realizes the reuse of heat and is more environmentally friendly. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the air heating system of the present invention;

[0017] Figure 2 It is a schematic diagram of the longitudinal cross-sectional structure of the heat exchanger of the present invention;

[0018] Figure 3 It is a schematic diagram of the transverse cross-sectional structure of the heat exchanger of the present invention. DETAILED DESCRIPTION

[0019] like Figure 1 As shown, a positive pressure cab air heating system in this embodiment includes an air conditioner 2, a heat exchanger 6, a fuel heater 9, an engine 10, and a fresh air supercharger 16. The air conditioner 2 is installed inside the cab 1, the heat exchanger 6 and the fresh air supercharger 16 are installed outside the cab 1, and the fuel heater 9 and the engine 10 are built-in structures of the road roller.

[0020] The heat exchanger 6 is connected to the fresh air supercharger 16 through the first air conditioning air intake pipe 5-1, and the heat exchanger 6 is connected to the air conditioning 2 through the second air conditioning air intake pipe 5-2. After being compressed and filtered by the fresh air supercharger 16, the external air enters the heat exchanger 6 for heat exchange, and the heated air enters the air conditioning 2 to provide pressurized hot air for the cab 1, thereby increasing the temperature in the cab.

[0021] The engine 10 is connected to the heat exchanger 6 through the first air-conditioning water inlet pipe 4-1, the heat exchanger 6 is connected to the air-conditioning 2 through the second air-conditioning water inlet pipe 4-2, and the air-conditioning 2 is also connected to the engine 10 through the air-conditioning return pipe 3. The fuel heater 9 is connected to the first air-conditioning water inlet pipe 4-1 through the fuel heater outlet pipe 7, and the fuel heater 9 is also connected to the air-conditioning return pipe 3 through the fuel heater inlet pipe 8. Through the above connection, the air-conditioning 2, the heat exchanger 6, and the fuel heater 9 form a first water cycle through the water flow pipe, and the air-conditioning 2, the heat exchanger 6, and the engine 10 form a second water cycle through the water flow pipe. When the engine is not started, the fuel heater 9 is turned on and the air in the cab 1 is heated through the first water cycle. After the engine is started, the air in the cab 1 is heated through the second water cycle.

[0022] An engine exhaust pipe 11 is provided on the engine 10. The heat exchanger 6 is connected to the engine exhaust pipe 11 through a heat exchanger hot air inlet pipe 14 and a heat exchanger hot air outlet pipe 15, so as to form an air circulation between the heat exchanger 6 and the engine 10. A three-way valve 13 is provided on the engine exhaust pipe 11. The heat exchanger hot air inlet pipe 14 is connected to the three-way valve 13, and the three-way valve 13 controls the amount of hot air flowing to the heat exchanger 6. The tail end of the engine exhaust pipe 11 is connected with a muffler 12 to reduce the engine exhaust noise. After the engine starts, the hot air discharged from the engine enters the heat exchanger hot air inlet pipe 14 through the engine exhaust pipe 11 and the three-way valve 13, and then is discharged from the heat exchanger hot air outlet pipe 15 after passing through the heat exchanger 6, realizing the reuse of the heat of the engine exhaust gas and improving the heating efficiency of the cab.

[0023] As Figure 2 and Figure 3 shown, the heat exchanger 6 includes a housing 6-2. Air conditioner inlet pipe connectors 6-1 are provided on both sides of the housing 6-2. A layered water channel 6-3 and a heat exchanger hot air pipe 6-5 are provided inside the housing 6-2. Air conditioner water inlet connectors 6-6 are provided at both ends of the layered water channel 6-3. Heat exchanger hot air pipe connectors 6-4 are provided at both ends of the heat exchanger hot air pipe 6-5. The air conditioner inlet pipe connectors 6-1 are respectively connected to a first air conditioner inlet pipe 5-1 and a second air conditioner inlet pipe 5-2. The air conditioner water inlet connectors 6-6 are respectively connected to a first air conditioner water inlet pipe 4-1 and a second air conditioner water inlet pipe 4-2. The heat exchanger hot air pipe connectors 6-4 are respectively connected to the heat exchanger hot air inlet pipe 14 and the heat exchanger hot air outlet pipe 15.

[0024] Three channels are formed inside the heat exchanger 6: the air conditioner inlet pipe connector 6-1 and the housing 6-2 form a channel for pressurizing and supplementing air. The gas pressurized by the fresh air supercharger 16 flows through this channel for heat exchange and then enters the air conditioner 2 to provide pressurized and heated air for the cab. The air conditioner water inlet connector 6-6 and the water channel 6-3 form an air conditioner system water channel. The circulating water in the first water cycle and the second water cycle passes through this channel for heat exchange to provide hot water for the air conditioner and heat the cab. The heat exchanger hot air pipe connector 6-4 and the heat exchanger hot air pipe 6-5 form a hot air channel. The engine air circulation flows through this channel, and the cab is quickly heated by using the engine exhaust gas.

[0025] The present invention realizes the heating of the cab through multiple circulating heat exchange lines, effectively improving the heating efficiency of the cab environment and ensuring the comfort of the cab; when the engine is not started, the first water cycle where the fuel heater is located is used to heat the air conditioning system to realize the preheating of the cab environment; after the engine is started, the second water cycle where the engine is located and the air cycle are used to heat the air conditioning system to realize the rapid heating of the cab environment; and the supplementary gas of the positive pressure supercharging system is heated through the heat exchanger to prevent the supplementary gas from entering the cab and reducing the indoor temperature, which helps to increase the cab temperature. Using the fuel heater for preheating does not consume too much battery power and does not affect the operation of the roller engine and other electrical appliances. At the same time, using the engine exhaust gas for heating realizes the reuse of heat and is more environmentally friendly.

Claims

1. A positive pressure cab air heating system, characterized in that, It includes an air conditioner (2), a heat exchanger (6), a fuel heater (9), an engine (10), and a positive pressure supercharging system. The air conditioner (2), the heat exchanger (6), and the fuel heater (9) form a first water circulation through a water flow pipeline. The air conditioner (2), the heat exchanger (6), and the engine (10) form a second water circulation through a water flow pipeline. The heat exchanger (6) and the engine (10) form an air circulation through a pipeline. The positive pressure supercharging system is connected to the air conditioner (2) through an air flow pipeline, and the heat exchanger (6) is located on this air flow pipeline.

2. The positive pressure cab air heating system according to claim 1, wherein, An engine exhaust pipe (11) is provided on the engine (10), and the heat exchanger (6) is connected to the engine exhaust pipe (11) through a heat exchanger hot air inlet pipe (14) and a heat exchanger hot air outlet pipe (15).

3. The positive pressure cab air heating system according to claim 2, characterized in that, A three-way valve (13) is provided on the engine exhaust pipe (11), and the heat exchanger hot air inlet pipe (14) is connected to the three-way valve (13).

4. The positive pressure cab air heating system according to claim 2, wherein, A muffler (12) is connected to the tail end of the engine exhaust pipe (11).

5. The positive pressure cab air heating system according to claim 2, characterized in that, The heat exchanger (6) is connected to the positive pressure supercharging system through a first air conditioner inlet pipe (5-1), and the heat exchanger (6) is connected to the air conditioner (2) through a second air conditioner inlet pipe (5-2).

6. The positive pressure cab air heating system according to claim 5, characterized in that, The engine (10) is connected to the heat exchanger (6) through a first air conditioner inlet water pipe (4-1), the heat exchanger (6) is connected to the air conditioner (2) through a second air conditioner inlet water pipe (4-2), and the air conditioner (2) is also connected to the engine (10) through an air conditioner return water pipe (3).

7. The positive pressure cab air heating system according to claim 6, wherein, The fuel heater (9) is connected to the first air conditioner inlet water pipe (4-1) through a fuel heater outlet water pipe (7), and the fuel heater (9) is also connected to the air conditioner return water pipe (3) through a fuel heater inlet water pipe (8).

8. The positive pressure cab air heating system according to claim 7, characterized in that, The heat exchanger (6) includes a housing (6-2). Air conditioner inlet pipe interfaces (6-1) are provided on both sides of the housing (6-2). A layered water channel (6-3) and a heat exchanger hot air pipe (6-5) are provided inside the housing (6-2). Air conditioner inlet water pipe interfaces (6-6) are provided at both ends of the layered water channel (6-3). Heat exchanger hot air pipe interfaces (6-4) are provided at both ends of the heat exchanger hot air pipe (6-5). The air conditioner inlet pipe interfaces (6-1) are respectively connected to the first air conditioner inlet pipe (5-1) and the second air conditioner inlet pipe (5-2). The air conditioner inlet water pipe interfaces (6-6) are respectively connected to the first air conditioner inlet water pipe (4-1) and the second air conditioner inlet water pipe (4-2). The heat exchanger hot air pipe interfaces (6-4) are respectively connected to the heat exchanger hot air inlet pipe (14) and the heat exchanger hot air outlet pipe (15).

9. The positive pressure cab air heating system according to claim 1, characterized in that, The positive pressure supercharging system is a fresh air supercharger (16).

10. A road roller, characterized in that, It includes the positive pressure cab air heating system according to any one of claims 1-9.

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