A test method for charging and degassing of a truck cooling system

Abstract

The application provides a test method for charging and degassing of a truck cooling system, comprising the following steps: connecting a branch pipe in parallel with a charging pipe, arranging a first flow control valve and a first observation window on the branch pipe; adjusting the first flow control valve to adjust the flow rate of refrigerant in the branch pipe, so that the flow rate of refrigerant in the branch pipe is less than that in the charging pipe; observing whether there is air bubble in the branch pipe through the first observation window to determine whether the degassing performance of the expansion tank is normal. Compared with the prior art, the application connects a branch pipe in parallel with a charging pipe, arranges a first flow control valve and a first observation window on the branch pipe, adjusts the first flow control valve to reduce the flow rate of refrigerant in the branch pipe, so as to observe the air bubble in the branch pipe through the first observation window, determine the air bubble in the charging pipe, and further determine the degassing performance of the expansion tank. Compared with high-speed camera observation, the test method has low investment, low cost and easy observation. In addition, the test method is simple and easy to implement.

Description

Technical Field

[0001] This invention relates to the field of vehicle degassing technology, and more particularly to a test method for degassing a truck cooling system. Background Technology

[0002] To ensure the proper functioning of the cooling system in heavy-duty trucks, the cooling system needs to have degassing capabilities. A degassing test is commonly used to determine this. Patent CN105174184B discloses an engine antifreeze filling device and method. The engine antifreeze filling device includes: an antifreeze filling tank mounted on a filling platform; an electric oil pump connected to the antifreeze filling tank for filling antifreeze into the engine; a filling pipeline connected between the electric oil pump and the engine for injecting antifreeze into the engine; a return pipeline connected between the engine and the antifreeze filling tank for returning antifreeze to the tank to remove air from the engine cooling system; and a detection device for detecting whether the air in the engine cooling system has been completely removed. The return pipeline is equipped with a transparent conduit and an air detection device, such as a gas sensor, for detecting whether there is residual air in the return pipeline. When the air detection device detects no residual air in the return pipeline, it indicates that the air in the engine cooling system has been completely removed. The air detection equipment is relatively complicated to install and expensive. Existing technologies also use high-speed cameras to observe whether there are air bubbles inside the transparent duct to determine if the cooling system is degassing properly; however, this method also has the drawback of being expensive. Summary of the Invention

[0003] This invention provides a test method for degassing a truck cooling system, which solves the problem of high cost in the prior art for detecting air bubbles in the injection pipe.

[0004] This invention provides a test method for degassing a truck cooling system, comprising the following steps:

[0005] A branch pipe is connected in parallel to the filling pipe, and a first flow control valve and a first observation window are installed on the branch pipe;

[0006] Adjust the first flow control valve to regulate the flow rate of the coolant in the branch pipe, so that the flow rate of the coolant in the branch pipe is less than the flow rate of the coolant in the filling pipe; observe whether there are air bubbles in the branch pipe through the first observation window to determine whether the degassing performance of the expansion tank is normal.

[0007] According to the present invention, a test method for degassing a truck cooling system is provided, wherein a second observation window and a second flow control valve are provided on a first degassing pipe between the engine and the expansion tank. When the degassing performance of the expansion tank is insufficient, the flow rate of the coolant entering the expansion tank is adjusted by observing the air bubbles in the first degassing pipe through the second observation window and operating the second flow control valve.

[0008] According to the present invention, a test method for degassing a truck cooling system is provided, wherein a third observation window and a third flow control valve are provided on the second degassing pipe between the radiator and the expansion tank. When the degassing performance of the expansion tank is insufficient, the flow rate of the coolant entering the expansion tank is adjusted by observing the air bubbles in the second degassing pipe through the third observation window and operating the third flow control valve.

[0009] According to the present invention, a test method for adding and degassing a truck cooling system is provided, wherein a transparent tube is provided on the filling pipe.

[0010] According to the test method for degassing a truck cooling system provided by the present invention, the first flow control valve, the second flow control valve and the third flow control valve are all throttle valves.

[0011] According to the present invention, a test method for degassing a truck cooling system is provided, wherein the first observation window, the second observation window, and the third observation window are transparent tubes respectively disposed on the branch pipe, the first degassing pipe, and the second degassing pipe.

[0012] According to the present invention, a test method for degassing a truck cooling system is provided, wherein the expansion tank is provided with a liquid level observation window.

[0013] According to a test method for degassing a truck cooling system provided by the present invention, the upper end of the expansion tank is provided with a pressure cap.

[0014] According to the present invention, a test method for degassing a truck cooling system further includes a thermostat, the first degassing pipe is disposed between the thermostat and the expansion tank, and a water inlet pipe is connected between the radiator and the thermostat.

[0015] According to the present invention, a test method for adding and degassing a truck cooling system is provided, wherein the engine is equipped with a water pump, the water pump is connected to the radiator by a water outlet pipe, one end of the filling pipe is connected to the water outlet pipe, and the other end is connected to the expansion tank.

[0016] This invention connects a branch pipe in parallel to the filling pipe, and sets a first flow control valve and a first observation window on the branch pipe. The first flow control valve is adjusted to reduce the flow rate of the coolant in the branch pipe, so that the bubble situation in the branch pipe can be observed through the first observation window, thereby determining the bubble situation in the filling pipe and judging the degassing performance of the expansion tank. Compared with high-speed camera observation, this inspection method requires less investment, has lower cost, and is easier to observe; secondly, the test method is simple and easy to implement. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a flowchart of the test method for degassing a truck cooling system provided by the present invention;

[0019] Figure 2 This is a schematic diagram of the degassing structure used in the test method for degassing a truck cooling system provided by the present invention;

[0020] Figure label:

[0021] 1: Filling pipe; 2: Branch pipe; 3: First flow control valve;

[0022] 4: Transparent tube; 5: Engine; 6: Expansion tank;

[0023] 7: First degassing pipe; 8: Second flow control valve; 9: Radiator;

[0024] 10: Second degassing pipe; 11: Third flow control valve; 12: Liquid level observation window;

[0025] 13: Pressure cap; 14: Thermostat; 15: Inlet pipe;

[0026] 16: Water pump; 17: Water outlet pipe. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0028] The following is combined Figures 1-2 This invention describes a test method for degassing a truck cooling system during charging. This embodiment provides a test method for degassing a truck cooling system during charging, comprising the following steps:

[0029] Step 1: Connect a branch pipe 2 in parallel to the filling pipe 1. Install a first flow control valve 3 and a first observation window on the branch pipe 2. Install a transparent tube 4 on the filling pipe 1. When the flow rate of the coolant in the filling pipe 1 is low, the bubble situation can be observed through the transparent tube 4 on the filling pipe 1.

[0030] Step Two: Adjust the first flow control valve 3 to regulate the flow rate of the refrigerant in branch pipe 2, ensuring that the flow rate is lower than that in filling pipe 1. Observe the branch pipe 2 through the first observation window to check for air bubbles, thus determining whether the degassing performance of the expansion tank 6 is normal, i.e., whether the cooling system has been successfully degassed. During the degassing process of the cooling system, the flow rate in filling pipe 1 is relatively high, making visual observation difficult and prone to errors. In existing technologies, the presence of air bubbles in filling pipe 1 is observed using a high-speed camera to determine the degassing performance of the expansion tank 6. In this invention, the flow rate of the refrigerant in branch pipe 2 is reduced by adjusting the first flow control valve 3. This makes it easier to visually observe whether air bubbles are present in branch pipe 2. The presence of air bubbles in branch pipe 2 indicates the presence of air bubbles in filling pipe 1, which is connected to branch pipe 2. The absence of air bubbles in branch pipe 2 indicates the absence of air bubbles in filling pipe 1, meaning that the expansion tank 6 has been successfully degassed. The observation structure provided by this invention has little impact on the flow rate of the coolant in the filling pipe 1 and little impact on the filling and degassing of the cooling system.

[0031] Step 3: Install a second observation window and a second flow control valve 8 on the first degassing pipe 7 between the engine 5 and the expansion tank 6. When the degassing performance of the expansion tank 6 is insufficient, i.e., when there are air bubbles in the filling pipe 1, observe the air bubble situation in the first degassing pipe 7 through the second observation window, and operate the second flow control valve 8 to adjust the flow rate of the coolant entering the expansion tank 6. Specifically: when there are many air bubbles in the first degassing pipe 7, adjust the second flow control valve 8 to reduce the flow rate of the coolant entering the expansion tank 6 through the first degassing pipe 7. This results in a longer flow time for the coolant in the expansion tank 6, allowing for a longer time for the air bubbles to separate, thus effectively ensuring the degassing performance of the expansion tank 6; conversely, adjust the second flow control valve 8 to increase the flow rate of the coolant entering the expansion tank 6 through the first degassing pipe 7.

[0032] Step 4: Install a third observation window and a third flow control valve 11 on the second degassing pipe 10 between the radiator 9 and the expansion tank 6. When the degassing performance of the expansion tank 6 is insufficient, observe the bubble situation in the second degassing pipe 10 through the third observation window, and operate the third flow control valve 11 to adjust the flow rate of the refrigerant entering the expansion tank 6. Specifically: when there are many bubbles in the second degassing pipe 10, adjust the third flow control valve 11 to reduce the flow rate of the refrigerant entering the expansion tank 6 through the second degassing pipe 10. This results in a longer flow time for the refrigerant in the expansion tank 6, allowing for longer bubble separation time, thus effectively ensuring the degassing performance of the expansion tank 6; conversely, adjust the third flow control valve 11 to increase the flow rate of the refrigerant entering the expansion tank 6 through the second degassing pipe 10.

[0033] Specifically, the first flow control valve 3, the second flow control valve 8, and the third flow control valve 11 are all throttle valves.

[0034] Specifically, the first observation window, the second observation window, and the third observation window are transparent tubes 4 installed on the branch pipe 2, the first degassing pipe 7, and the second degassing pipe 10, respectively.

[0035] Specifically, the expansion tank 6 is equipped with a liquid level observation window 12, and the upper end of the expansion tank 6 is equipped with a pressure cover 13.

[0036] This embodiment also includes a thermostat 14, a first vent pipe 7 is disposed between the thermostat 14 and the expansion tank 6, and a water inlet pipe 15 is connected between the radiator 9 and the thermostat 14. A water pump 16 is provided inside the engine 5, and a water outlet pipe 17 is connected between the water pump 16 and the radiator 9. One end of the filling pipe 1 is connected to the water outlet pipe 17, and the other end is connected to the expansion tank 6.

[0037] This invention utilizes a parallel branch pipe 2 connected to the filling pipe 1. By adjusting the first flow control valve 3 to reduce the flow rate of the refrigerant in the branch pipe 2, the air bubble situation in the branch pipe 2 can be observed through the first observation window, thereby determining the air bubble situation in the filling pipe 1 and ultimately judging the degassing performance of the expansion tank 6. This inspection method is low-cost and easy to implement. When air bubbles are found in the filling pipe 1, indicating insufficient degassing performance of the expansion tank 6, the air bubble situation in the first degassing pipe 7 and the second degassing pipe 10 is observed. Based on the air bubble situation, the second flow control valve 8 and the third flow control valve 11 are adjusted to control the flow rate of the refrigerant entering the expansion tank 6 in each degassing pipe, ensuring that the amount of air bubbles in the degassing pipe is inversely proportional to the flow rate of the refrigerant in the degassing pipe, thus guaranteeing the degassing performance of the expansion tank 6. This adjustment method requires minimal modification to existing equipment, has low modification costs, and is easy to implement.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test method for charging and outgassing of a truck cooling system, characterized in that, It comprises the following steps: A branch pipe (2) is connected in parallel with the filling pipe (1), a first flow control valve (3) and a first observation window are arranged on the branch pipe (2); The flow rate of refrigerant in the branch pipe (2) is adjusted by adjusting the first flow control valve (3), so that the flow rate of refrigerant in the branch pipe (2) is less than that in the filling pipe (1); whether there are bubbles in the branch pipe (2) is observed through the first observation window to determine whether the deaeration performance of the expansion tank (6) is normal; A second observation window and a second flow control valve (8) are arranged on the first deaeration pipe (7) between the engine (5) and the expansion tank (6), when the deaeration performance of the expansion tank (6) is insufficient, the bubble condition in the first deaeration pipe (7) is observed according to the second observation window, and the flow rate of refrigerant entering the expansion tank (6) is adjusted by operating the second flow control valve (8).

2. The test method for charging outgassing of a truck cooling system of claim 1, wherein, A third observation window and a third flow control valve (11) are arranged on the second deaeration pipe (10) between the radiator (9) and the expansion tank (6), when the deaeration performance of the expansion tank (6) is insufficient, the bubble condition in the second deaeration pipe (10) is observed according to the third observation window, and the flow rate of refrigerant entering the expansion tank (6) is adjusted by operating the third flow control valve (11).

3. The test method for charging outgassing of a truck cooling system of claim 1 wherein, The filling pipe (1) is provided with a transparent pipe (4).

4. The test method for charging outgassing of a truck cooling system of claim 2, wherein, The first flow control valve (3), the second flow control valve (8) and the third flow control valve (11) are all throttle valves.

5. The test method for charging outgassing of a truck cooling system of claim 2, wherein, The first observation window, the second observation window and the third observation window are respectively transparent pipes (4) arranged on the branch pipe (2), the first deaeration pipe (7) and the second deaeration pipe (10).

6. The test method for charging outgassing of a truck cooling system of claim 1 wherein, The expansion tank (6) is provided with a liquid level observation window (12).

7. The test method for charging outgassing of a truck cooling system of claim 1 wherein, The upper end of the expansion tank (6) is provided with a pressure cover (13).

8. The test method for charging outgassing of a truck cooling system of claim 2, wherein, A thermostat (14) is further included, the first deaeration pipe (7) is arranged between the thermostat (14) and the expansion tank (6), and a water inlet pipe (15) is connected between the radiator (9) and the thermostat (14).

9. The test method for charging outgassing of a truck cooling system of claim 2, wherein, A water pump (16) is arranged in the engine (5), a water outlet pipe (17) is in communication between the water pump (16) and the radiator (9), one end of the filling pipe (1) is in communication with the water outlet pipe (17), and the other end is in communication with the expansion tank (6). A water pump (16) is arranged in the engine (5), a water outlet pipe (17) is in communication between the water pump (16) and the radiator (9), one end of the filling pipe (1) is in communication with the water outlet pipe (17), and the other end is in communication with the expansion tank (6).

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