Low-position exhaust locomotive cooling system

Abstract

The utility model belongs to the technical field of cooling systems, and discloses a low-position exhaust locomotive cooling system which comprises a dry expansion water tank, a radiator, a drainage pipeline and an exhaust pipeline. The dry expansion water tank is arranged below the radiator; the other end of the drainage pipeline is communicated with the bottom of the dry-type expansion water tank; and the other end of the exhaust pipeline is communicated with the top of the dry-type expansion water tank. By means of the arrangement, especially the design of the relative positions of the dry expansion water tank and the radiator, when a locomotive stops running, it is guaranteed that cooling liquid cannot be retained in the radiator, the problems that in the low-temperature environment, the cooling liquid freezes to enable a pipe fin type radiator pipeline to be expanded and broken, and consequently liquid leakage of the radiator is caused are solved, and the system exhaust function is also considered; the reliability and the service life of the cooling device are ensured; the relative position of the dry expansion water tank and the radiator is matched with the design of the built-in flow channel, so that the installation of the dry expansion water tank is more flexible and convenient, and the design space is better utilized.

Description

Technical Field

[0001] The utility model belongs to the technical field of cooling systems, and particularly relates to a locomotive cooling system with low-position exhaust. Background Art

[0002] With the rapid development of the rail transit industry, the demand for rail transit equipment increases. As an indispensable safety component in rail transit equipment, the reliability requirements for locomotive cooling systems are also getting higher and higher. However, the current locomotive cooling systems mainly have the following problems:

[0003] (1) When the locomotive is out of service, the coolant in the radiator stays in the radiator. In a low-temperature environment, the coolant freezes, bursting the pipes of the finned-tube radiator and causing the radiator to leak fluid, resulting in poor reliability of the cooling device.

[0004] (2) As a water pressure stabilizing device for the water circuit of the locomotive cooling system, the dry expansion tank also functions as an exhaust device for the system. It usually needs to be installed at the highest point of the cooling circuit to ensure that the air in the circuit can smoothly enter the dry expansion tank. For locomotive cooling systems with high requirements for design space, this causes a great waste of space.

[0005] Therefore, it is necessary to propose a locomotive cooling system with good reliability and space saving to solve the problems existing in the prior art. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a locomotive cooling system with good reliability and space saving, and the specific technical solutions are as follows:

[0007] A locomotive cooling system with low-position exhaust, comprising a dry expansion tank, a radiator, a drain pipeline and an exhaust pipeline;

[0008] The dry expansion tank is arranged below the radiator;

[0009] The outlet of the radiator is communicated with the inlet of the dry expansion tank, the outlet of the dry expansion tank is communicated with the inlet of the device to be cooled, and the outlet of the device to be cooled is communicated with the inlet of the radiator; the radiator is used to cool the high-temperature coolant from the device to be cooled, and the dry expansion tank is used to send the cooled coolant in the radiator into the device to be cooled and store the coolant;

[0010] One end of the drain pipeline is communicated with the bottom of the radiator, and the other end is communicated with the bottom of the dry expansion tank;

[0011] One end of the exhaust pipeline is communicated with the top of the radiator, and the other end is communicated with the top of the dry expansion tank.

[0012] Preferably, the outlet of the radiator is arranged at the top of the radiator.

[0013] Preferably, solenoid valves are provided on both the drainage pipeline and the exhaust pipeline.

[0014] Preferably, the outlet of the device to be cooled is communicated with the inlet of the radiator through an internal flow channel provided inside the dry expansion tank.

[0015] Preferably, both ends of the internal flow channel are respectively connected to the outlet of the device to be cooled and the inlet of the radiator through connecting flanges.

[0016] Preferably, the internal flow channel is rectangular.

[0017] Preferably, the outlet of the radiator and the inlet of the dry expansion tank are communicated through a circular pipeline.

[0018] Preferably, a liquid level display, a liquid level switch and a pressure relief valve are further provided on the dry expansion tank;

[0019] The liquid level display is arranged on the side of the dry expansion tank and is used to observe the liquid level height inside the dry expansion tank;

[0020] The liquid level switch is used to turn on or off the liquid level alarm system according to the liquid level;

[0021] The pressure relief valve is installed on the upper part of the dry expansion tank and is used to balance the pressure when the pressure in the locomotive cooling system is too high.

[0022] Preferably, an inlet chamber and an outlet chamber are further provided inside the dry expansion tank;

[0023] The inlet of the dry expansion tank is communicated with the inlet chamber, the outlet of the dry expansion tank is communicated with the outlet chamber, and the inlet chamber and the outlet chamber are communicated at the bottom of the dry expansion tank;

[0024] The inlet chamber and the outlet chamber have the same height and are less than the height at which the liquid level switch of the dry expansion tank operates; small holes for discharging air bubbles are provided on the top panel of the inlet chamber.

[0025] Preferably, an overflow pipe is further provided on the dry expansion tank and is used to limit the liquid level when the dry expansion tank is filled with liquid.

[0026] Compared with the prior art, the beneficial effects of the present utility model are:

[0027] (1) A locomotive cooling system with low - level exhaust of the present utility model includes a dry expansion tank, a radiator, a drainage pipeline, and an exhaust pipeline; the dry expansion tank is arranged below the radiator; the outlet of the radiator is communicated with the inlet of the dry expansion tank, the outlet of the dry expansion tank is communicated with the inlet of the device to be cooled, and the outlet of the device to be cooled is communicated with the inlet of the radiator; the radiator is used to cool the high - temperature coolant from the device to be cooled, and the dry expansion tank is used to send the cooled coolant in the radiator into the device to be cooled and store the coolant; one end of the drainage pipeline is communicated with the bottom of the radiator, and the other end is communicated with the bottom of the dry expansion tank; one end of the exhaust pipeline is communicated with the top of the radiator, and the other end is communicated with the top of the dry expansion tank. Through the above settings, especially the design of the relative position between the dry expansion tank and the radiator, when the locomotive is out of service, it is ensured that the coolant will not stay in the radiator, preventing the pipes of the fin - tube radiator from bursting due to the freezing of the coolant in a low - temperature environment, thus avoiding problems such as radiator leakage. It also takes into account the system exhaust function, ensuring the reliability and service life of the cooling device;

[0028] (2) Through the design of the relative position between the dry expansion tank and the radiator and the built - in flow channel, the installation of the dry expansion tank is more flexible and convenient, making better use of the design space.

[0029] Other features and advantages of the present utility model will become clear through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0030] Figure 1 is a schematic diagram of the connection relationship of a locomotive cooling system with low - level exhaust in the embodiment;

[0031] Figure 2 is a schematic diagram of the structure of the dry expansion tank in the embodiment;

[0032] Figure 3 is Figure 2 the internal structure schematic diagram of the dry expansion tank;

[0033] In the figure: 1. Dry expansion tank, 1.1. Water inlet chamber, 1.2. Water outlet chamber, 1.3. Built - in flow channel, 1.4. Overflow pipe, 1.5. Circular pipe;

[0034] 2. Liquid level indicator; 3. Overflow pipe joint; 4. Liquid level switch; 5. Connection flange; 6. Outlet of the dry expansion tank; 7. Drainage pipeline; 8. Exhaust pipeline; 9. Inlet of the dry expansion tank; 10. Pressure relief valve; 11. Device to be cooled; 12. Solenoid valve; 13. Radiator; 14. Fan; 15. Water pump. Detailed Embodiments

[0035] The embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings. However, the present utility model can be implemented in many different ways as defined and covered by the claims.

[0036] Embodiment:

[0037] Refer to Figure 1 , a locomotive cooling system with low-position exhaust, including a dry expansion tank 1, a radiator 13, a drainage pipeline 7 and an exhaust pipeline 8; the dry expansion tank 1 is arranged below the radiator 13; the outlet of the radiator 13 is communicated with the inlet 9 of the dry expansion tank, the outlet 6 of the dry expansion tank is communicated with the inlet of the device to be cooled 11, and the outlet of the device to be cooled 11 is communicated with the inlet of the radiator 13; the radiator 13 is used to cool the high-temperature coolant from the device to be cooled 11, and the dry expansion tank 1 is used to send the cooled coolant in the radiator 13 into the device to be cooled 11 and store the coolant; one end of the drainage pipeline 7 is communicated with the bottom of the radiator 13, and the other end is communicated with the bottom of the dry expansion tank 1; one end of the exhaust pipeline 8 is communicated with the top of the radiator 13, and the other end is communicated with the top of the dry expansion tank 1.

[0038] The dry expansion tank in this embodiment contains 8 cavities (including an inlet cavity and an outlet cavity), 1 rectangular built-in flow channel, 1 circular pipeline for the inlet of the dry expansion tank and 1 overflow pipe; this application is mainly applied to the cooling of diesel engines, and the device to be cooled 11 is a diesel engine in this embodiment.

[0039] The radiator of the cooling system in this embodiment is a commonly used radiator in the art, and a fan 14 is preferably arranged on the radiator for heat dissipation.

[0040] A water pump 15 for providing power is also arranged between the dry expansion tank 9 and the device to be cooled 11.

[0041] The outlet of the radiator 13 is arranged at the top of the radiator 13.

[0042] Solenoid valves 12 are arranged on both the drainage pipeline 7 and the exhaust pipeline 8.

[0043] Refer to Figure 2 and Figure 3 , the outlet of the device to be cooled 11 is communicated with the inlet of the radiator 13 through a built-in flow channel 1.3 arranged inside the dry expansion tank 1.

[0044] Both ends of the built-in flow channel 1.3 are respectively connected to the outlet of the device to be cooled 11 and the inlet of the radiator 13 through connecting flanges 5.

[0045] The built-in flow channel 1.3 is rectangular. The lower part of the rectangular built-in flow channel is connected to the diesel engine outlet, and the upper part is connected to the inlet of the radiator. It is arranged inside the dry expansion tank, which can save external space. The rectangular shape is convenient for direct welding with rectangular plates when welding the water tank.

[0046] The outlet of the radiator 13 and the inlet of the dry expansion tank 9 are connected through a circular pipe 1.5. The circular pipe is beneficial to reducing the generation of bubbles due to impact of the coolant entering the dry expansion tank from the radiator.

[0047] The dry expansion tank 1 is also provided with a liquid level indicator 2, a liquid level switch 4 and a pressure relief valve 10;

[0048] The liquid level indicator 2 is arranged on the side of the dry expansion tank 1 for observing the liquid level height inside the dry expansion tank 1;

[0049] The liquid level switch is installed at the bottom of the dry expansion tank for turning on or off the liquid level alarm system according to the liquid level; that is, it can give an alarm when the liquid level is too low to remind the operator to add coolant. If the operation time at low liquid level is too long, it can also directly cut off the operation of the entire cooling system.

[0050] The pressure relief valve 10 is installed on the upper part of the dry expansion tank 1 for opening the pressure relief valve when the pressure in the locomotive cooling system is too high to balance the pressure of the cooling system.

[0051] The dry expansion tank 1 is also provided with a water inlet chamber 1.1 and a water outlet chamber 1.2; the inlet 9 of the dry expansion tank is communicated with the water inlet chamber 1.1, the outlet 6 of the dry expansion tank is communicated with the water outlet chamber 1.2, and the water inlet chamber 1.1 and the water outlet chamber 1.2 are communicated at the bottom of the dry expansion tank 1; the water inlet chamber 1.1 and the water outlet chamber 1.2 are of the same height and less than the height at which the liquid level switch 4 of the dry expansion tank 1 operates; small holes for discharging bubbles are opened on the top panel of the water inlet chamber 1.1.

[0052] The cavity height of the water inlet chamber and the water outlet chamber needs to be less than the cut-off alarm liquid level height of the dry expansion tank to ensure that the water outlet chamber is always filled with coolant. A certain number of small holes are opened on the upper panel of the water inlet chamber to facilitate the overflow of internal bubbles of the coolant. The water inlet chamber and the water outlet chamber are communicated at the bottom of the dry expansion tank, which is convenient for quickly replenishing the water outlet chamber with liquid, and at the same time ensures that the water outlet chamber is always filled with coolant and has no bubbles, and continuously transports the bubble-free coolant to the device to be cooled.

[0053] The dry expansion tank 1 is also provided with an overflow pipe 1.4 for limiting the liquid level when injecting liquid into the dry expansion tank 1. And it is connected to the outside through an overflow pipe joint 3.

[0054] The working principle of the low-position exhaust of the locomotive cooling system in this embodiment is as follows:

[0055] See Figure 1 During the cooling operation mode, a cooling circuit is formed by a radiator, a dry expansion tank, a water pump, a diesel engine and pipelines. In this embodiment, the coolant is preferably circulating cooling water, and the device to be cooled is a diesel engine;

[0056] The dry expansion tank is connected in series in the cooling circuit. The water flowing out of the outlet of the dry expansion tank enters the diesel engine after being pressurized by the water pump. The high-temperature cooling water after heat exchange in the diesel engine enters the radiator through the rectangular internal flow channel of the dry expansion tank for air-cooled heat exchange. The cooling water with reduced temperature flows out from the water outlet pipe arranged at the highest point of the radiator, and enters the water inlet cavity of the dry expansion tank through a circular pipeline, thus completing a cycle of the cooling water;

[0057] Since the outlet of the radiator in this application is located at the top of the radiator, and the pressure of the dry expansion tank is the lowest, when the cooling water circulates, the coolant flowing out from the outlet at the top of the radiator will carry the gas inside the radiator into the dry expansion tank with lower pressure. The gas accumulates in the upper part of the dry expansion tank after entering it. When the system pressure is too high, the pressure relief valve located in the upper part of the dry expansion tank opens to discharge the excess gas in the system, thereby realizing the low-position exhaust of the dry expansion tank during the cooling process.

[0058] The drain pipeline 7 connects the bottom of the radiator and the bottom of the dry expansion tank, and a normally open solenoid valve is provided thereon. During the cooling operation mode, the cooling system is powered on and the solenoid valve is closed; during the non-cooling operation mode, the solenoid valve in this pipeline is powered off and opened, and the coolant inside the radiator flows back to the dry expansion tank under the action of gravity.

[0059] The exhaust pipeline 8 connects the top of the radiator and the top of the dry expansion tank, and a solenoid valve is also provided thereon. During the non-cooling operation mode, the solenoid valve is opened. Since the gas inside the dry expansion tank has a smaller density and is located at the top of the dry expansion tank, when the coolant flows back into the dry expansion tank, it enters the radiator under the extrusion of the flowing-back coolant.

[0060] When the system is powered off and the water pump stops running, both solenoid valves are opened. The coolant in the radiator flows into the dry expansion tank through the drain pipeline under the action of gravity; the gas in the dry expansion tank flows into the radiator through the exhaust pipeline; at the same time, the gas entering the radiator further compresses the coolant inside the radiator into the dry expansion tank. Eventually, all the coolant inside the radiator can flow into the dry expansion tank.

[0061] With the above settings, especially the design of the relative position between the dry expansion tank and the radiator, when the locomotive is out of service, it is ensured that the coolant will not remain in the radiator, preventing the coolant from freezing in a low-temperature environment and causing the pipes of the finned-tube radiator to burst, thus avoiding problems such as radiator liquid leakage. It also takes into account the system exhaust function, ensuring the reliability and service life of the cooling device;

[0062] At the same time, through the design of the relative position between the dry expansion tank and the radiator in cooperation with the internal flow channel, the installation of the dry expansion tank is more flexible and convenient, making better use of the design space.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A locomotive cooling system with low exhaust, characterized in that: It comprises a dry expansion water tank (1), a radiator (13), a drainage pipeline (7) and an exhaust pipeline (8); The dry expansion water tank (1) is arranged below the radiator (13); The outlet of the radiator (13) is connected to the inlet (9) of the dry expansion water tank, the outlet (6) of the dry expansion water tank is connected to the inlet of the device to be cooled (11), and the outlet of the device to be cooled (11) is connected to the inlet of the radiator (13); the radiator (13) is used to cool the high-temperature coolant from the device to be cooled (11), and the dry expansion water tank (1) is used to send the cooled coolant in the radiator (13) to the device to be cooled (11) and store the coolant; One end of the drainage pipeline (7) is connected to the bottom of the radiator (13), and the other end is connected to the bottom of the dry expansion water tank (1); One end of the exhaust pipe (8) is connected to the top of the radiator (13), and the other end is connected to the top of the dry expansion water tank (1).

2. A locomotive cooling system with low exhaust according to claim 1, characterized in that: The outlet of the radiator (13) is arranged at the top of the radiator (13).

3. A locomotive cooling system with low exhaust according to claim 2, characterized in that: The drainage pipeline (7) and the exhaust pipeline (8) are both provided with solenoid valves (12).

4. A locomotive cooling system with low exhaust according to claim 1, characterized in that: The outlet of the device to be cooled (11) is connected to the inlet of the radiator (13) via a built-in flow channel (1.3) arranged inside the dry expansion water tank (1).

5. A locomotive cooling system with low exhaust according to claim 4, characterized in that: Both ends of the built-in flow channel (1.3) are connected to the outlet of the device to be cooled (11) and the inlet of the radiator (13) respectively through connecting flanges (5).

6. A locomotive cooling system with low exhaust according to claim 5, characterized in that: The built-in flow channel (1.3) is rectangular.

7. A locomotive cooling system with low exhaust according to claim 1, characterized in that: The outlet of the radiator (13) and the inlet (9) of the dry expansion water tank are connected via a circular pipe (1.5).

8. A locomotive cooling system with low exhaust according to claim 1, characterized in that: The dry expansion water tank (1) is also provided with a liquid level display (2), a liquid level switch (4) and a pressure relief valve (10); The liquid level display (2) is arranged on the side of the dry expansion water tank (1) and is used to observe the liquid level height inside the dry expansion water tank (1); The liquid level switch (4) is used to turn on or off the liquid level alarm system according to the liquid level; The pressure relief valve (10) is installed on the upper part of the dry expansion water tank (1) and is used to balance the pressure when the pressure in the locomotive cooling system is too high.

9. A locomotive cooling system with low exhaust according to claim 8, characterized in that: The dry expansion water tank (1) is further provided with a water inlet chamber (1.1) and a water outlet chamber (1.2); The inlet (9) of the dry expansion water tank is in communication with the water inlet chamber (1.1), the outlet (6) of the dry expansion water tank is in communication with the water outlet chamber (1.2), and the water inlet chamber (1.1) and the water outlet chamber (1.2) are in communication at the bottom of the dry expansion water tank (1); The water inlet chamber (1.1) and the water outlet chamber (1.2) have the same height, and are smaller than the height at which the liquid level switch (4) of the dry expansion water tank (1) operates; a small hole for discharging bubbles is provided on the top panel of the water inlet chamber (1.1).

10. A locomotive cooling system with low exhaust according to claim 1, characterized in that: The dry expansion water tank (1) is also provided with an overflow pipe (1.4) for increasing the liquid filling time limit of the dry expansion water tank (1).

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