Intelligent warm air system of engineering machinery and bulldozer

Abstract

The invention discloses an intelligent warm air system for engineering machinery and a bulldozer. The intelligent warm air system comprises an engine, a T-shaped three-way piece I, a T-shaped three-way piece II, a T-shaped three-way piece III, a reversing electromagnetic valve, a warm air blower, a hot air diverter valve and a fuel heater. The engine is communicated with the warm air blower, the T-shaped three-way piece I and the T-shaped three-way piece II are connected between the engine and the warm air blower in series, the one-way valve is connected between the T-shaped three-way piece I and the T-shaped three-way piece II in series, and the reversing electromagnetic valve is connected to a water return hose of the warm air blower in series. The T-shaped three-way piece III is connected in series between the T-shaped three-way piece I and the reversing electromagnetic valve; the fuel heater is connected in series between the T-shaped three-way piece I and the T-shaped three-way piece III; a hot air outlet of the fan heater is connected with the hot air diverter valve, and the hot air diverter valve is provided with three independent outlets which are communicated with the hot air outlets in the top, the middle and the bottom of the cab respectively. The system is high in temperature rising speed and diversified in operation control mode, has the function of a parking air conditioner, and is comprehensive in heating and more energy-saving.

Description

Technical Field

[0001] The present invention relates to the technical field of heating systems, and in particular to an intelligent heating system for engineering machinery and a bulldozer. Background Art

[0002] At present, the heating system of construction machinery mainly transfers the hot water in the engine to the heater through the heater water pipe for heat exchange to generate hot air, thereby heating the cab. However, the engine heats up slowly in a low-temperature environment, resulting in insufficient heating of the cab. The cab remains in low-temperature mode for a long time, with a long heating time and large temperature fluctuations. In addition, the traditional heating system has a single and fixed warm air outlet, which makes it difficult to achieve a more comprehensive heating of the driver, and the overall heating comfort is poor. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides an intelligent heating system for engineering machinery and a bulldozer, which has a fast heating speed, diverse operation control modes, and the function of parking air conditioning, and is comprehensive and more energy-efficient in heating.

[0004] The technical solution adopted by the present invention to solve the technical problem is: an intelligent heating system for engineering machinery, including an engine, a T-type three-way piece I, a T-type three-way piece II, a T-type three-way piece III, a reversing solenoid valve, a heater, a hot air diverter valve and a fuel heater;

[0005] The water outlet of the engine is connected to the water inlet hose of the heater through a pipeline, and the water inlet of the engine is connected to the water outlet hose of the heater through a pipeline; the T-shaped three-way piece I and the T-shaped three-way piece II are connected in series between the engine and the heater through a pipeline, and a one-way valve is connected in series between the T-shaped three-way piece I and the T-shaped three-way piece II, and the one-way valve allows the antifreeze to flow only from the engine to the heater;

[0006] The reversing solenoid valve is connected in series to the return hose of the heater; the T-shaped three-way piece III is connected in series between the T-shaped three-way piece I and the reversing solenoid valve through a pipeline; the fuel heater is connected in series between the T-shaped three-way piece I and the T-shaped three-way piece III through a pipeline;

[0007] The hot air outlet of the heater is connected to a hot air diverter valve, and the hot air diverter valve is provided with three independent outlets, which are respectively connected to a top hot air outlet, a middle hot air outlet and a bottom hot air outlet of the cab through pipelines.

[0008] Furthermore, the operating states of the intelligent air heating system include parking mode and start mode;

[0009] In the parking mode, the engine is in a stopped state, the fuel heater is started, and the high-temperature antifreeze is circulated under the drive of the built-in water pump of the fuel heater, and enters the heater through the T-type three-way piece II. The high-temperature antifreeze in the heater is cooled by the fan, and the cooled antifreeze flows back to the fuel heater through the reversing solenoid valve and the T-type three-way piece III in turn, forming a first antifreeze loop;

[0010] The air in the heater becomes high-temperature air through heat exchange with the high-temperature antifreeze. The high-temperature air enters the hot air diverter valve and is discharged from the top hot air outlet, the middle hot air outlet and the bottom hot air outlet of the cab through the hot air diverter valve for heating.

[0011] Furthermore, in the startup mode, the engine is in a running working state, and the temperature of the antifreeze liquid in the engine is detected;

[0012] Assume that the temperature of the antifreeze in the engine is T0, and the lower limit of the preset temperature of the antifreeze in the engine is T min The preset upper limit temperature of the antifreeze liquid in the engine is set to T max ;

[0013] If T0<T min , the fuel heater continues to run and only provides heat to the cab through the first antifreeze circuit of the fuel heater.

[0014] Furthermore, in the startup mode, if T min ≤T0≤T max ; The heat in the cab is composed of two parts, one part is provided by the fuel heater through the first antifreeze circuit, and the other part is provided by the engine through the second antifreeze circuit;

[0015] The antifreeze in the second antifreeze loop flows from the engine through the T-type three-way piece I, the one-way valve, the T-type three-way piece II, the heater and the reversing solenoid valve in sequence, and then flows back to the engine to form a cycle.

[0016] Furthermore, in the startup mode, if T0>T max , the heat is provided by the engine, and the fuel heater is turned off; at this time, the antifreeze flows through the engine, T-type three-way piece I, the one-way valve, T-type three-way piece II, the heater and the engine in sequence according to the second antifreeze loop, forming a cycle;

[0017] If there is excess heat in the antifreeze in the pipeline between the reversing solenoid valve and the T-type three-way piece I, the auxiliary circulation branch is opened; the antifreeze in the auxiliary circulation branch flows through the engine, T-type three-way piece I, T-type three-way piece III, the reversing solenoid valve and the engine in sequence to form a circulation.

[0018] The invention also discloses a bulldozer, comprising the intelligent heating system for engineering machinery.

[0019] Beneficial effects of the present invention:

[0020] The intelligent heating system for engineering machinery of the present invention skillfully combines engine heating with fuel heater heating, and has a variety of operating modes. The cab heats up in a short time and at a fast speed in a low-temperature environment. The traditional heating air outlet structure is changed to provide more comprehensive and comfortable heating for the driver, and the temperature fluctuation in the cab is small, so that the temperature in the cab is kept constant. The system has a parking air conditioning function, that is, it also has a normal heating function when the engine is not started. In addition, the coordinated cooperation of engine heating and fuel heater heating has lower energy consumption and is more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an intelligent heating system for engineering machinery of the present invention.

[0022] Figure 2 The present invention discloses an operation logic diagram of an intelligent heating system for engineering machinery.

[0023] In the figure: 1. Engine; 2. T-type three-way piece I; 3. T-type three-way piece II; 4. T-type three-way piece III; 5. Reversing solenoid valve; 6. Warm air machine; 7. Hot air diverter valve; 8. Cab; 9. Fuel heater; 10. Check valve; 11. Temperature sensor. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings.

[0025] The invention discloses an intelligent heating system for engineering machinery.

[0026] Referring to the figure, an intelligent heating system for construction machinery includes an engine 1, a T-type three-way piece I2, a T-type three-way piece II3, a T-type three-way piece III4, a reversing solenoid valve 5, a heater 6, a hot air diverter valve 7, and a fuel heater 9. The water outlet of the engine 1 is connected to the water inlet hose of the heater 6 through a pipeline, and the water inlet of the engine 1 is connected to the water outlet hose of the heater 6 through a pipeline. A temperature sensor 11 is provided on the engine 1 for detecting the temperature of the antifreeze in the engine 1. T-type tee piece Ⅰ2 and T-type tee piece Ⅱ3 are connected in series between engine 1 and heater 6 through pipelines. T-type tee piece Ⅰ2 and T-type tee piece Ⅱ3 are connected in series with a one-way valve 10, and the one-way valve 10 allows the antifreeze to flow only from engine 1 to heater 6; the reversing solenoid valve 5 is connected in series to the return hose of heater 6; the T-type tee piece Ⅲ4 is connected in series between T-type tee piece Ⅰ2 and reversing solenoid valve 5 through pipelines; the fuel heater 9 is connected in series between T-type tee piece Ⅰ2 and T-type tee piece Ⅲ4 through pipelines.

[0027] The hot air outlet of the heater 6 is connected to the hot air diverter valve 7; the hot air diverter valve 7 is provided with three independent outlets, which are respectively connected with the top hot air outlet, the middle hot air outlet and the bottom hot air outlet of the cab 8 through pipes, and the flow area of ​​the independent outlets is adjustable, which can be set according to needs to control different air volumes and wind speeds to enter the cab 8; this setting enables the hot air generated by the heater 6 to heat different parts of the driver such as the head, body and feet at the same time, making the heating experience more comfortable.

[0028] The operating states of the intelligent air heating system include parking mode and start mode.

[0029] In parking mode, the engine 1 is in a stopped state, the fuel heater 9 is started, and the high-temperature antifreeze is circulated under the drive of the built-in water pump of the fuel heater 9, and enters the heater 6 through the T-type three-way piece II3; the high-temperature antifreeze in the heater 6 is cooled down by the blowing of the fan, and the cooled antifreeze flows back to the fuel heater 9 through the reversing solenoid valve 5 and the T-type three-way piece III4 in turn, forming a cycle.

[0030] The air in the heater 6 becomes high-temperature air through heat exchange with the high-temperature antifreeze, and the high-temperature air enters the hot air diverter valve 7, and is discharged from the top hot air outlet, the middle hot air outlet and the bottom hot air outlet of the cab 8 through the hot air diverter valve 7 for heating.

[0031] In the start mode, the engine 1 is in the running working state, and the temperature of the antifreeze liquid in the engine 1 is detected; the temperature of the antifreeze liquid in the engine 1 is set to T0, and the preset lower limit of the temperature of the antifreeze liquid in the engine 1 is set to T min The preset upper limit temperature of the antifreeze liquid in the engine 1 is set to T max In this embodiment, T min Take 60℃, T max Take 85℃.

[0032] If T0 is less than 60°C, the fuel heater 9 continues to operate, and only the first antifreeze circuit of the fuel heater 9 provides heat to the cab 8; at this time, the flow path of the antifreeze is the same as the antifreeze flow path in the parking mode.

[0033] In the start-up mode, if 60℃≤T0≤85℃; the heat in the cab 8 is composed of two parts, one part is provided by the fuel heater 9 through the first antifreeze circuit, and the other part is provided by the engine 1. The size of the diverted flow is determined by the flow area of ​​the engine 1 end of the reversing solenoid valve 5; because the engine 1 provides part of the heat through the second antifreeze circuit, the heating power of the fuel heater 9 is reduced, thereby saving some energy consumption.

[0034] Among them, the antifreeze in the second antifreeze circuit flows from the engine 1 through the T-type three-way piece Ⅰ2, the one-way valve 10, the T-type three-way piece Ⅱ3, the heater 6 and the reversing solenoid valve 5 in sequence, and then flows back to the engine 1 to form a cycle; at this time, the second antifreeze circuit is the same as the antifreeze circulation flow path in the parking mode.

[0035] In the start mode, if T0>85°C, the heat is provided by the engine 1, and the fuel heater 9 is turned off; at this time, the antifreeze flows in the second antifreeze loop and sequentially flows through the engine 1, the T-type three-way piece I2, the one-way valve 10, the T-type three-way piece II3, the heater 6 and the engine 1, forming a cycle;

[0036] If there is excess heat in the antifreeze in the pipeline between the reversing solenoid valve 5 and the T-shaped three-way piece Ⅰ2, the auxiliary circulation branch is opened; the antifreeze in the auxiliary circulation branch flows through the engine 1, the T-shaped three-way piece Ⅰ2, the T-shaped three-way piece Ⅲ4, the reversing solenoid valve 5 and the engine 1 in sequence, forming a cycle. The auxiliary circulation branch utilizes the residual heat in the pipeline generated by the operation of the heating system when the antifreeze temperature in the parking mode and the engine 1 is low, further reducing the heating energy consumption.

[0037] The present invention also discloses a bulldozer, which uses the above-mentioned intelligent heating system for engineering machinery for heating. The cab 8 heats up quickly, has various control modes, and has the function of parking air conditioning, that is, it has the heating function without starting the engine 1. After the water temperature of the antifreeze in the engine 1 reaches the preset target temperature, the engine 1 alone provides heat to the cab 8, and the fuel heater 9 is not started, which is more energy-saving.

[0038] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An intelligent heating system for construction machinery, characterized in that: It comprises an engine (1), a T-shaped three-way piece I (2), a T-shaped three-way piece II (3), a T-shaped three-way piece III (4), a reversing solenoid valve (5), a heater (6), a hot air diverter valve (7) and a fuel heater (9); The water outlet of the engine (1) is connected to the water inlet hose of the heater (6) through a pipeline, and the water inlet of the engine (1) is connected to the water outlet hose of the heater (6) through a pipeline; the T-shaped three-way piece I (2) and the T-shaped three-way piece II (3) are connected in series between the engine (1) and the heater (6) through a pipeline, and a one-way valve (10) is connected in series between the T-shaped three-way piece I (2) and the T-shaped three-way piece II (3), and the one-way valve (10) allows the antifreeze liquid to flow only from the engine (1) to the heater (6); The reversing solenoid valve (5) is connected in series to the water return hose of the heater (6); the T-shaped three-way piece III (4) is connected in series between the T-shaped three-way piece I (2) and the reversing solenoid valve (5) through a pipeline; the fuel heater (9) is connected in series between the T-shaped three-way piece I (2) and the T-shaped three-way piece III (4) through a pipeline; The hot air outlet of the heater (6) is connected to the hot air diverter valve (7), and the hot air diverter valve (7) is provided with three independent outlets, which are respectively connected to the top hot air outlet, the middle hot air outlet and the bottom hot air outlet of the cab (8) through pipelines.

2. The intelligent heating system for construction machinery according to claim 1, characterized in that: The operating states of the intelligent air heating system include parking mode and start mode; In the parking mode, the engine (1) is in a stopped state, the fuel heater (9) is started, and the high-temperature antifreeze is circulated under the drive of the built-in water pump of the fuel heater (9), and enters the heater (6) through the T-shaped three-way piece II (3). The temperature of the high-temperature antifreeze in the heater (6) is reduced under the action of the fan, and the cooled antifreeze flows back to the fuel heater (9) through the reversing solenoid valve (5) and the T-shaped three-way piece III (4) in turn, forming a first antifreeze loop; The air in the heater (6) is converted into high-temperature air by heat exchange with the high-temperature antifreeze liquid, and the high-temperature air enters the hot air diverter valve (7), and is discharged from the top hot air outlet, the middle hot air outlet and the bottom hot air outlet of the cab (8) through the hot air diverter valve (7) for heating.

3. The intelligent heating system for construction machinery according to claim 2, characterized in that: In the starting mode, the engine (1) is in an operating state, and the temperature of the antifreeze liquid in the engine (1) is detected; Assume that the temperature of the antifreeze liquid in the engine (1) is T0, and the preset lower limit of the temperature of the antifreeze liquid in the engine (1) is T min The preset upper limit temperature of the antifreeze liquid in the engine (1) is set to T max ; If T0<T min , the fuel heater (9) continues to operate, and heat is provided to the cab (8) only through the first antifreeze circuit of the fuel heater (9).

4. The intelligent heating system for construction machinery according to claim 3, characterized in that: In the startup mode, if T min ≤T0≤T max ; The heat in the cab (8) consists of two parts, one part of which is provided by the fuel heater (9) through the first antifreeze circuit, and the other part is provided by the engine (1) through the second antifreeze circuit; The antifreeze in the second antifreeze circuit flows from the engine (1) through the T-shaped three-way piece I (2), the one-way valve (10), the T-shaped three-way piece II (3), the heater (6) and the reversing solenoid valve (5) in sequence, and then flows back to the engine (1) to form a cycle.

5. The intelligent heating system for construction machinery according to claim 4, characterized in that: In the startup mode, if T0>T max , the heat is provided by the engine (1), and the fuel heater (9) is turned off; at this time, the antifreeze liquid flows through the engine (1), the T-shaped three-way piece I (2), the one-way valve (10), the T-shaped three-way piece II (3), the heater (6) and the engine (1) in sequence according to the second antifreeze liquid circuit, forming a cycle; If there is excess heat in the antifreeze in the pipeline between the reversing solenoid valve (5) and the T-shaped three-way piece I (2), the auxiliary circulation branch is opened; the antifreeze in the auxiliary circulation branch flows in the order of the engine (1), the T-shaped three-way piece I (2), the T-shaped three-way piece III (4), the reversing solenoid valve (5) and the engine (1), forming a circulation.

6. A bulldozer, characterized in that: The intelligent heating system for engineering machinery comprises the intelligent heating system for engineering machinery as described in any one of claims 1 to 5.

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