Pressure enhanced cooling device of plateau tunnel construction machinery engine

Abstract

The utility model discloses a pressure-enhanced cooling device of a plateau tunnel construction machinery engine, and relates to an engine cooling system of construction machinery. The cooling device is characterized in that cooling fins are mounted on the outer wall of a cooling liquid tank, an air supply system is mounted on the surfaces of the cooling fins and comprises an air compression channel and an air source inlet, a spray pipe is mounted in the air compression channel, an inlet of the spray pipe is trumpet-shaped, a throat portion of the spray pipe is closely connected to the inlet, and the throat portion is in a contraction state relative to the inlet. The nozzle throat and the nozzle body are in an expanded state. Compared with the prior art, the cooling fin has the advantages that the air compression channels are additionally arranged on the cooling fin, the spray pipes are installed in the air compression channels, the temperature of air passing through the spray pipes is rapidly reduced, then efficient cooling of an engine of the plateau tunnel construction machine is achieved, a reliable cooling solution is provided for plateau tunnel construction, and the working efficiency is improved. And normal operation of the construction machinery in a severe environment is ensured.

Description

Technical Field

[0001] A pressure-enhanced cooling device for a plateau tunnel construction machinery engine relates to an engine cooling system for a construction machinery, and is particularly suitable for cooling the engine of engineering machinery in a plateau tunnel construction environment. Background Art

[0002] During construction in plateau areas, especially in plateau tunnels, due to the low air pressure and temperature, ordinary engine cooling systems are prone to problems such as insufficient heat exchange and too low boiling point in this environment, resulting in increased thermal load on construction machinery and difficulty in starting. The current solutions to this problem are mainly as follows: Figure 1 The closed system shown here maintains the water tank pressure at a specific value and uses forced air to enhance cooling. However, this forced air supply still relies on fans to provide airflow. Due to the low external air pressure and density, heat exchange is insufficient. Consequently, this can still lead to overheating of construction machinery, affecting normal operation and efficiency, and even causing damage. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a cooling device that can effectively improve the cooling efficiency of the engine of construction machinery in plateau areas, especially in plateau tunnels. The technical solution is as follows:

[0004] A pressure-enhanced cooling device for the engine of plateau tunnel construction machinery includes a heat sink, which consists of fins mounted on the outer wall of a coolant tank. A coolant inlet is located at the upper end of the coolant tank, and a coolant outlet is located at the lower end. The key technology is the installation of an air supply system on the surface of the heat sink. The air supply system includes an air compression channel and an air source inlet, with a one-way valve and a solenoid valve connected in series via a pipeline between the air source inlet and the air compression channel. A nozzle is installed in the air compression channel. The nozzle includes an inlet, a throat, and a nozzle body. The nozzle inlet is trumpet-shaped, with the throat immediately adjacent to the inlet. The throat is contracted relative to the inlet, while the nozzle throat and the nozzle body are expanded.

[0005] Compared with the prior art, the present invention has the following beneficial effects:

[0006] 1. The utility model adds an air compression channel on the heat sink, and installs a nozzle in the air compression channel. The inlet of the nozzle is trumpet-shaped, the throat of the nozzle is in a contracted state, and the nozzle throat to the nozzle body is in an expanded state. In this way, the temperature of the gas passing through the nozzle drops rapidly. At this time, the high-temperature heat sink and the low-temperature air compression channel are in contact. A sufficient amount of cold air is provided inside the air compression channel, and the cold air is used to cool the heat sink, thereby achieving efficient cooling of the engine of plateau tunnel construction machinery, providing a reliable cooling solution for plateau tunnel construction, and ensuring the normal operation of construction machinery in harsh environments.

[0007] 2. The tail end of the air compression channel is connected to a muffler through a pipe. High-speed air flows out of the muffler, and the noise of gas emissions is eliminated.

[0008] 3. The cooling system is reasonably designed and easy to install and maintain on existing construction machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the structure of the prior art engine cooling device;

[0010] Figure 2 This is a schematic diagram of the principle structure of the engine cooling device of the utility model;

[0011] Figure 3 This is a schematic structural diagram of the engine cooling device of the utility model;

[0012] Figure 4 It is a schematic diagram of the air compression channel structure of the utility model. DETAILED DESCRIPTION

[0013] like Figure 2 、 Figure 3 As shown, a pressure-enhanced cooling device for a plateau tunnel construction machinery engine includes a heat dissipation device 1. The heat dissipation device 1 is a heat sink 3 installed on the outer wall of a coolant tank 4. A coolant inlet 6 is opened at the upper end of the coolant tank 4, and a coolant outlet 5 is opened at the lower end of the coolant tank 4. The heat dissipation device 1 is characterized in that an air supply system is installed on the surface of the heat sink 3 through a connection 2. The air supply system includes an air compression channel 11 and an air source inlet 7. A one-way valve 8 and a solenoid valve 9 are connected in series in sequence through a pipeline between the air source inlet 7 and the air compression channel 11; a plurality of nozzles 12 are installed in the air compression channel 11, such as Figure 4 As shown, the nozzle 12 includes an inlet 12.1, a throat 12.2 and a nozzle body 12.3. The inlet 12.1 of the nozzle 12 is trumpet-shaped to facilitate receiving the gas source. Immediately following the inlet 12.1 is the throat 12.2 of the nozzle. The throat 12.2 is in a contracted state compared to the inlet 12.1. The nozzle throat to the nozzle body 12.3 is in an expanded state, forming a nozzle body with a variable cross-section.

[0014] The tail end of the air compression channel 11 is connected to the muffler 10 through a pipeline, and high-speed air flows out of the muffler 10 to reduce the noise of gas emission.

[0015] This cooling device is installed on the engine. Figure 2 As shown, in the working mode, the solenoid valve 9 is in the open state, and the air flows from the air source inlet 7 through the one-way valve 8 and the solenoid valve 9 into the air compression channel 11. Figure 4 As shown, due to the change in the cross-section of the nozzle 12 (first contraction and then expansion), the gas flow rate will gradually increase. At the throat of the nozzle (i.e., the smallest cross-section), the gas flow rate reaches the speed of sound or supersonic speed. During this process, the temperature of the gas will gradually decrease. This is because as the gas flow rate increases, part of the thermal energy will be converted into kinetic energy, causing the temperature of the gas to drop. In addition, since the gas in the air compression channel 11 is in a high-speed flow state, the collision and friction between the gas molecules will also take away some heat, thereby further reducing the temperature of the gas. The air compression channel 11 is installed on the surface of the heat sink 3. At this time, the high-temperature heat sink 3 after absorbing the heat from the engine contacts the low-temperature air compression channel 11, and the high temperature is transferred to the air compression channel 11. A sufficient amount of cold air is provided inside the air compression channel 11. The coolant in the coolant tank 4 passes through the flow of gas in the air compression channel 11 and takes away the heat generated by the engine when it is working, thereby achieving the effect of cooling the engine.

Claims

1. A pressure-enhanced cooling device for a plateau tunnel construction machine engine, comprising a heat dissipation device (1), wherein the heat dissipation device (1) is a heat sink (3) installed on the outer wall of a coolant tank (4), a coolant inlet (6) is opened at the upper end of the coolant tank (4), and a coolant outlet (5) is opened at the lower end of the coolant tank (4), wherein the heat dissipation device (1) is characterized in that An air supply system is installed on the surface of the heat sink (3), the air supply system comprising an air compression channel (11) and an air source inlet (7), a one-way valve (8) and a solenoid valve (9) being sequentially connected in series via a pipeline between the air source inlet (7) and the air compression channel (11); a nozzle (12) is installed in the air compression channel (11), the nozzle (12) comprising an inlet (12.1), a throat (12.2) and a nozzle body (12.3), the inlet (12.1) of the nozzle (12) being trumpet-shaped, the throat (12.2) of the nozzle being adjacent to the inlet (12.1), the throat (12.2) being in a contracted state compared to the inlet (12.1), and the nozzle throat to the nozzle body (12.3) being in an expanded state.

2. The pressure-enhanced cooling device for the plateau tunnel construction machinery engine according to claim 1 is characterized by: The tail of the air compression channel (11) is connected to a muffler (10) through a pipeline.

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