Car expansion tank assembly

Abstract

This invention belongs to the field of expansion tank technology, and in particular provides an automotive expansion tank assembly. The automotive expansion tank assembly includes a tank body and a bypass assembly disposed within the tank body. One end of the tank body is provided with an intake pipe, and the top of the other end of the tank body is provided with an outlet pipe. A side pipe is located near the intake pipe. The inner end of the intake pipe extends directly into the tank body. One end of the side pipe is connected to the tank body, and the other end of the side pipe is connected to the intake pipe. This allows the refrigerant in the piston cylinder to be discharged through a second gas pipe, and then sprayed into the tank body through an atomizing nozzle on the second gas pipe. There, it undergoes a vaporization and cooling reaction with the high-temperature gas delivered to the tank body through the intake pipe. The resulting cooling gas, obtained from the vaporization and cooling reaction of the refrigerant and the high-temperature gas in the tank body, is collected together and circulated into the engine through the outlet pipe, improving the engine's cooling efficiency.

Description

Technical Field

[0001] This invention relates to the field of expansion vessel technology, and particularly to automotive expansion vessel assemblies. Background Technology

[0002] The expansion tank is installed near the car engine. Its intake pipe connects to the engine's exhaust pipe, and its exhaust pipe connects to the engine's intake pipe. When the engine generates a large amount of heat, high-temperature gas enters the expansion tank, vaporizing the refrigerant inside and allowing it to enter the engine, thus cooling the engine and ensuring it operates at its optimal temperature. Simultaneously, the high-pressure gas generated by the engine enters the expansion tank to relieve pressure. The top of the expansion tank has a refrigerant injection port, and each end has a gas pipe connected to one side of the engine, forming a circulating cooling system.

[0003] However, existing expansion tanks can only cool and depressurize the high temperature and high pressure generated when the engine is in normal working condition. When the engine experiences sudden high temperature and high pressure due to a malfunction, the generated hot and high pressure gas enters the expansion tank. Due to the rapid increase in gas pressure and temperature, the depressurization of the expansion tank and the vaporization of the refrigerant cannot be carried out instantly. This results in a poor match between the engine and the expansion tank in terms of cyclic cooling and depressurization, thus leading to a lower risk resistance of the engine. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to effectively match the protective performance of the expansion tank when the engine suddenly fails and the temperature and pressure rise rapidly. Therefore, an automotive expansion tank assembly is provided.

[0005] The technical solution of the present invention is an automotive expansion tank assembly, comprising a tank body filled with refrigerant and a bypass assembly disposed within the tank body. One end of the tank body is provided with an inlet pipe, and the top of the other end of the tank body is provided with an outlet pipe. A side pipe is disposed near the inlet pipe, the inner end of the inlet pipe extends directly into the tank body, one end of the side pipe is connected to the tank body, and the other end of the side pipe is connected to the inlet pipe. The bypass assembly includes a bypass pipe located within the tank body, one end of the bypass pipe being connected to the end of the side pipe connected to the tank body, and the other end of the bypass pipe extending horizontally from the top of the inner cavity of the tank body and connected to a first gas pipe.

[0006] A first gas check valve is installed on the first gas pipe. The bypass assembly also includes a pressure relief and exhaust mechanism. The pressure relief and exhaust mechanism includes a piston cylinder and a piston plate that slides within the piston cylinder. The piston cylinder is filled with refrigerant. One end of the piston cylinder extends towards the first gas pipe and is connected to the outer wall of the first gas pipe. The other end of the piston cylinder is connected to a second gas pipe, which is opposite to the bypass pipe. The second gas pipe extends from the body of the container and is located below the outlet pipe. An air bladder is provided at the bottom of the piston cylinder. One end of the air bladder is connected to the first gas pipe, and the other end of the air bladder is connected to the piston cylinder through a metal pipe. A partition plate is fixed inside the piston cylinder, located near the piston plate, and forming a gas collecting chamber between the partition plate and the piston plate. The connection end of the metal pipe and the piston cylinder is located within the gas collecting chamber. A second gas check valve is installed on the metal pipe. The opening pressure of the second gas check valve is greater than the opening pressure of the first gas check valve.

[0007] The second air pipe is provided with a plurality of atomizing nozzles facing the inner end of the air outlet pipe. The piston cylinder is filled with a spring, one end of which is connected to the piston plate, and the other end of which is connected to the end of the piston cylinder where the second air pipe is installed.

[0008] As a further preferred embodiment, the bypass pipe is provided with a diameter-changing section, wherein one end of the bypass pipe gradually tapers towards the one end of the first trachea.

[0009] As a further preferred embodiment, the spring is a cylindrical spring, wherein the inner diameter of the spring is larger than the diameter of the second air tube, and the diameter of the second air tube is smaller than the diameter of the piston cylinder.

[0010] As a further preferred embodiment, the top of the kettle body is provided with a refrigerant injection port, which is located near the outlet pipe. An injection pipe located on the outer side of the top of the kettle body is connected to the refrigerant injection port. The other end of the injection pipe passes through the top of the kettle body into the kettle body and is connected to the piston cylinder. One end of the injection pipe connected to the refrigerant injection port enters the refrigerant injection port and is coaxial with the inner hole of the refrigerant injection port with its opening facing upward.

[0011] As a further preferred embodiment, the refrigerant injection port is fitted with a screw cap via external threads.

[0012] As a further preferred embodiment, the inner end of the air outlet pipe is provided with a baffle fixed to the top surface of the inner cavity of the pot, the top end of the second air pipe is vortex-shaped, the vortex-shaped part is located below the baffle, and a plurality of atomizing nozzles on the air outlet pipe are equidistantly arranged along the vortex-shaped part at the top end of the second air pipe, with the nozzles of the atomizing nozzles facing upward toward the baffle.

[0013] As a further preferred embodiment, a row of liquid extraction pipes is installed on the piston cylinder, the liquid extraction pipes being equidistantly distributed along the length of the piston cylinder, the piston cylinder being vertically downward and extending into the refrigerant inside the reservoir, each of the liquid extraction pipes being equipped with a liquid one-way valve, the liquid one-way valve closing when the piston plate advances along the inner wall of the piston cylinder toward the second gas pipe, the liquid one-way valve opening when the piston plate advances along the inner wall of the piston cylinder toward the metal pipe, and refrigerant being pumped into the piston cylinder through the liquid extraction pipe.

[0014] As a further preferred embodiment, the outer circular surface of the piston plate is provided with rounded corners, and the piston plate slides in contact with the inner wall of the piston cylinder through the rounded corners on the outer circular surface.

[0015] The advantages of this invention compared to existing technologies are twofold: Firstly, by employing two intake channels to allow high-pressure, high-temperature gas to enter the vessel, it prevents blockage of a single pipe from affecting normal pressure relief and cooling. Secondly, the dual-channel entry of high-pressure, high-temperature gas creates two areas within the vessel where refrigerant vaporizes, cools, and relieves pressure. This method improves pressure relief and cooling efficiency, providing protection, especially when the engine experiences a sudden pressure surge and temperature increase due to a sudden malfunction. If higher-than-normal high-pressure, high-temperature gas enters the vessel, in addition to the normal primary pressure relief and cooling, a secondary pressure relief and cooling process is activated via a side pipe, bypass pipe, first gas check valve, metal pipe, second gas check valve, piston plate, second gas pipe, and atomizing nozzle. This involves spraying atomized refrigerant into the outlet pipe to cool the portion of gas that has not yet had time to cool. Attached Figure Description

[0016] Figure 1 A first structural schematic diagram of an automotive expansion tank assembly provided for an embodiment of the present invention;

[0017] Figure 2 A second structural schematic diagram of a partially cut-open automotive expansion tank assembly provided in an embodiment of the present invention;

[0018] Figure 3 This is a partial cross-sectional structural diagram of the automotive expansion tank assembly in the second embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the automobile expansion tank assembly when longitudinally cut from the position of the piston cylinder in the second embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure when the pot body is horizontally cut open from the top position in the second practical example of the present invention;

[0021] Figure 6 This is a schematic diagram showing the positional relationship between the injection pipe and the refrigerant injection port when the refrigerant injection port is cut open.

[0022] In the diagram: 1. Kettle body; 2. Bypass assembly; 3. Inlet pipe; 4. Outlet pipe; 5. Side pipe; 6. Bypass pipe; 8. First gas pipe; 9. First gas check valve; 10. Pressure relief and exhaust mechanism; 11. Piston cylinder; 12. Piston plate; 13. Second gas pipe; 14. Air bladder; 15. Metal pipe; 16. Gas collection chamber; 17. Divider plate; 18. Second gas check valve; 19. Atomizing nozzle; 20. Spring; 21. Variable diameter section; 22. Refrigerant inlet; 23. Baffle; 24. Injection pipe; 25. Screw cap; 26. Liquid extraction pipe; 27. Liquid check valve. Implementation

[0023] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] In one implementation, such as Figures 1-6 As shown.

[0025] The automotive expansion tank assembly provided in this embodiment includes a tank body 1 filled with refrigerant and a bypass assembly 2 disposed within the tank body 1. One end of the tank body 1 is provided with an intake pipe 3 connected to the exhaust pipe (pressure relief pipe) on the engine, and the top of the other end of the tank body 1 is provided with an outlet pipe 4 connected to the intake pipe (circulation pipe) on the engine. According to the existing matching principle between the engine and the expansion tank assembly, when the engine is running, the high-pressure or high-temperature gas generated enters the tank body 1 through the intake pipe 3. The high temperature in the gas vaporizes the refrigerant in the tank body 1. During the vaporization of the refrigerant, heat exchange and cooling (refrigeration) are completed between the refrigerant and the high-temperature gas. At the same time, the high-pressure gas generated during engine operation enters the tank body 1 to be depressurized. After the gas is cooled, it circulates back into the engine through the outlet pipe 4, so that the engine is circulated for cooling and protection. However, it should be noted that if the pressure and temperature of the high-pressure and high-temperature gas from the engine are higher than normal, the gas can stay in the tank body 1 for a shorter time. A considerable portion of the gas will return to the engine through the outlet pipe 4 before the refrigerant vaporizes. It should be noted that the container 1 is not filled with refrigerant. Generally speaking, the refrigerant level is lower than that of the inlet pipe 3.

[0026] In this embodiment, a side pipe 5 is provided near the intake pipe 3. The inner end of the intake pipe 3 is directly connected to the container 1, one end of the side pipe 5 is connected to the inside of the container 1, and the other end of the side pipe 5 is connected to the intake pipe 3. This allows the high-pressure, high-temperature gas from the engine to enter the container 1 not only through the single intake pipe 3, but also through the side pipe 5 via the side intake. Using two intake channels to allow the high-pressure, high-temperature gas to enter the container 1 serves two purposes: first, it prevents blockage of a single pipe from affecting normal depressurization and cooling; second, the high-pressure, high-temperature gas entering the container 1 through two channels can create two areas in the container 1 where the refrigerant vaporizes, cools, and depressurizes. When the engine experiences a sudden malfunction (such as internal combustion or gear wear causing gear oil to heat up), and the pressure and temperature rise rapidly, this method can improve the depressurization and cooling efficiency, thus providing protection.

[0027] To ensure rapid and effective handling of the high-temperature and high-pressure gases generated in the event of a sudden engine failure, a bypass assembly 2 is installed inside the vessel body 1, as shown in the figure. The bypass assembly 2 includes a bypass pipe 6 located inside the vessel body 1. One end of the bypass pipe 6 connects to a side pipe 5 connected to the end inside the vessel body 1, and the other end of the bypass pipe 6 extends horizontally from the top of the inner cavity of the vessel body 1 and connects to a first air pipe 8. That is, the bypass pipe 6 inside the vessel body 1 communicates with the side pipe 5 used for intake. Therefore, the side pipe 5 not only assists the intake pipe 3 in rapidly handling the high-pressure and high-temperature gases from the engine, but also first delivers the introduced high-pressure and high-temperature gases to the bypass pipe 6, and then to the first air pipe 8. A first gas valve is installed on the first air pipe 8. When the pressure of the high-pressure, high-temperature gas exceeds the rated opening pressure of the first gas check valve 9, the first gas check valve 9 will open. Thus, the first gas check valve 9 is designed to automatically detect whether a bypass pipe is needed to depressurize the high-pressure, high-temperature gas in the engine. When the engine does not experience a rapid increase in pressure due to a malfunction, there is no need to perform auxiliary depressurization through the bypass pipe 5. The high-pressure, high-temperature gas can simply be delivered to the reservoir 1 through the intake pipe 3 for depressurization. At the same time, the high-temperature gas depressurizes the refrigerant and is cooled by heat exchange with the gas formed after the refrigerant depressurization. Since the amount of refrigerant vaporization is effectively controlled by only one direction through the intake pipe 3, the reservoir 1 is well matched with the specific state of the engine.

[0028] In addition to the bypass pipe 6 mentioned above, the bypass assembly 2 also includes a pressure relief and exhaust mechanism 10. The pressure relief and exhaust mechanism 10 includes a piston cylinder 11 and a piston plate 12 that slides within the piston cylinder 11. Like the kettle body 1, the piston cylinder 11 is also filled with refrigerant during factory assembly. One end of the piston cylinder 11 extends towards the first air pipe 8 and is fixed to the outer wall of the first air pipe 8. The other end of the piston cylinder 11 is connected to a second air pipe 13, which is opposite to the bypass pipe 6. The second air pipe 13 communicates with the piston cylinder 11 and is located below the outlet pipe 4 inside the reservoir 1. An air bladder 14 is provided at the bottom of the piston cylinder 11, and one end of the air bladder 14 is connected to the first air pipe 8. Therefore, if the engine rapidly heats up and pressurizes due to a sudden situation, the high-pressure gas generated will not only enter the reservoir 1 through the intake pipe 3 to be depressurized and cooled, but also a portion of the high-pressure, high-temperature gas will be diverted by the side pipe 5 and enter the bypass pipe 6. When the air pressure exceeds the opening pressure of the first gas check valve 9, the first gas check valve 9 will open, allowing gas to enter the airbag 14 and inflate it. Since the first gas check valve 9 supplies gas in one direction only, and the gas pressure in the inlet direction is greater than the gas pressure inside the airbag 14, the gas entering the airbag 14 will not flow back in reverse; instead, it will continuously collect within the airbag 14. Furthermore, since the other end of the airbag 14 is connected to the piston cylinder 11 via a metal tube 15, and a partition plate 17 is fixed inside the piston cylinder 11 near the piston plate 12, forming a gas collecting chamber 16 between the piston cylinder 11 and the piston plate 12, the connection end of the metal tube 15 to the piston cylinder 11 is located within the gas collecting chamber 16. A second gas check valve 18 is installed on the gas chamber 14. The opening pressure of the second gas check valve 18 is greater than that of the first gas check valve 9. Therefore, as gas is continuously collected in the gas chamber 14, the gas pressure inside the gas chamber 14 will gradually increase. When the gas pressure in the gas chamber 14 is greater than the opening pressure of the second gas check valve 18, the second gas check valve 18 will open, allowing gas to enter the gas collecting chamber 16 through the metal pipe 15. The sudden high-pressure gas in the gas collecting chamber 16 will push the piston plate 12 to move inside the piston cylinder 11, causing the volume of the piston cylinder 11 to gradually decrease. This will produce two effects: firstly, the refrigerant in the piston cylinder 11 will be discharged through the second gas pipe 13, and then... Then, the atomizing nozzle 19 on the second air pipe 13 sprays the refrigerant into the container 1, where it reacts with the high-temperature gas delivered to the container 1 by the intake pipe 3 to vaporize and cool. The refrigerant and the refrigerant gas obtained after the reaction of the refrigerant and the high-temperature gas in the container 1 are collected together and circulated into the engine through the exhaust pipe 4 to improve the engine's cooling efficiency. Secondly, the displacement of the piston plate 12 in the piston cylinder 11 achieves side pressure relief. Since a large number of atomizing nozzles 19 are installed on the second air pipe 13, and these atomizing nozzles 19 are located at the bottom of the inner end of the exhaust pipe 4, the refrigerant from the piston cylinder 11 enters the exhaust pipe 4 in an atomized state from the bottom of the exhaust pipe 4 and is released outward from the exhaust pipe 4.Meanwhile, the high-pressure, high-temperature gas directly supplied to the reservoir 1 by the intake pipe 3 will also cause the refrigerant in the reservoir 1 to be vaporized at high temperature. The vaporized refrigerant will then cool the engine. Therefore, when the engine suddenly fails and the air pressure and temperature are high, the gas enters the reservoir 1 through the intake pipe 3 as the first channel for primary depressurization and cooling. The bypass assembly 2 serves as the second channel for cooling and depressurization, assisting the reservoir 1 in implementing secondary depressurization and cooling of the high-pressure, high-temperature gas entering the engine during a sudden failure. This provides more favorable depressurization and cooling protection for the engine during sudden failures, thus improving the engine's resilience in the event of a sudden failure.

[0029] In summary, in this embodiment, if a gas with a higher pressure and temperature than usual enters the vessel body 1, in addition to activating the first-stage depressurization and cooling as usual, a second-stage depressurization and cooling is activated through the side pipe 5, bypass pipe 6, first gas check valve 9, metal pipe 15, second gas check valve 18, piston plate 12, second gas pipe 13, and atomizing nozzle 19, etc., and atomized refrigerant is sprayed into the gas outlet pipe 4 to cool down the part of the gas that has not had time to cool down in the gas outlet pipe 4.

[0030] A spring 20 is filled inside the piston cylinder 11. One end of the spring 20 is connected to the piston plate 12, and the other end is connected to the end of the piston cylinder 11 where the second air pipe 13 is installed. When the engine malfunction resolves itself or is resolved through manual maintenance, the engine returns to normal operation. Although the high-pressure, high-temperature gas generated during operation can be delivered to the reservoir 1, it is unlikely that a sudden surge in high-pressure, high-temperature gas will occur due to a malfunction. The normally discharged high-pressure, high-temperature gas only needs to be normally discharged into the reservoir 1 through the intake pipe 3 to depressurize it, and then cooled by the refrigerant vaporization in the reservoir 1. The gas circulates from the exhaust pipe 4 into the engine to cool it down. Although some of the high-pressure, high-temperature gas generated at this time will also enter the bypass pipe 6 through the side pipe 5, the gas pressure under normal conditions is not enough to open the first gas check valve 9. Therefore, the first gas check valve 9 and the entire bypass assembly 2 containing the first gas check valve 9 do not have the function of depressurization and cooling. At this time, the spring 20 releases its elastic force and supports the piston plate 12 in the initial position in the piston cylinder 11. The original volume of the piston cylinder 11 returns to the normal state, waiting for the next emergency situation to perform bypass depressurization again.

[0031] Spring 20 is a cylindrical spring. The inner diameter of spring 20 is larger than that of the second air tube 13. The diameter of the second air tube 13 is smaller than that of the piston cylinder 11. The purpose is to ensure that the inner diameter of spring 20 does not affect the communication between the inner cavity of the second air tube 13 and the piston cylinder 11.

[0032] In one implementation, such as Figures 3-4 As shown.

[0033] The automotive expansion tank assembly provided in this embodiment also includes a row of liquid extraction pipes 26 installed on the piston cylinder 11. These pipes 26 are equidistantly distributed along the length of the piston cylinder 11, which faces vertically downwards and extends into the refrigerant within the tank body 1. Each extraction pipe 26 is equipped with a liquid one-way valve 27. When the piston plate 12 advances along the inner wall of the piston cylinder 11 towards the second gas pipe 13, the liquid one-way valve 27 closes, and the refrigerant in the piston cylinder 11 is limited to being discharged through the second gas pipe 13 into the atomizing nozzle 19. After being sprayed out by the atomizing nozzle 19, it reacts with the high-temperature, high-pressure gas from the intake pipe 3 within the tank body 1 to generate refrigerant gas. When the engine resumes operation... When the system returns to normal and the side pipe 5 no longer needs to supply branch gas to the bypass pipe 6, the spring 20 will release its elastic force and push the piston plate 12 along the piston cylinder 11 to the initial position, since the gas in the gas bag 14 has been completely discharged into the gas collecting chamber 16. When the piston plate 12 retracts in the opposite direction, it creates a negative pressure suction force in the inner cavity of the piston cylinder 11 close to the second gas pipe 13. Through the negative pressure suction force, refrigerant is replenished from the vessel 1 into the piston cylinder 11 through the liquid extraction pipe 26. That is, after the piston plate 12 retracts to the initial position of the piston cylinder 11, the refrigerant discharged from the piston cylinder 11 will be automatically restored, thus dynamically replenishing the piston cylinder 11 with refrigerant for the next use.

[0034] The bypass pipe 6 is provided with a reducing section 21. One end of the reducing section 21 of the bypass pipe 6 gradually tapers towards the other end of the first air pipe 8. This allows the high-pressure, high-temperature gas from the side pipe 5 to enter the first air pipe 8 along the bypass pipe 6. Since the volume of the side pipe 5 and the bypass pipe 6 is greater than the volume of the first air pipe 8, the high-pressure, high-temperature gas entering the first air pipe 8 can be rapidly pressurized and open the first gas check valve 9, injecting it into the air bag 14. This serves two purposes: first, it allows the high-pressure, high-temperature gas to be quickly collected into the air bag 14; second, it allows the high-pressure, high-temperature gas from the side pipe 5 and the bypass pipe 6 to be rapidly depressurized. This relieves the pressure on the air inlet pipe 3, which normally functions as a pressure relief pipe, to properly deliver high-pressure, high-temperature gas into the kettle body 1.

[0035] like Figure 1 , Figure 2 as well as Figure 6 As shown, the top of the kettle body 1 is provided with a refrigerant injection port 22, which is located near the outlet pipe 4. An injection pipe 24 located on the outer side of the top of the kettle body 1 is connected to the refrigerant injection port 22. The other end of the injection pipe 24 passes through the top of the kettle body 1 and into the kettle body 1 and is connected to the piston cylinder 11. One end of the injection pipe 24 connected to the refrigerant injection port 22 enters the refrigerant injection port 22 and is on the same axis as the inner hole of the refrigerant injection port 22 with the opening facing upward.

[0036] The refrigerant inlet 22 is used not only to inject refrigerant into the vessel 1, but also to replenish refrigerant into the piston cylinder 11 through the injection tube 24 inside the refrigerant inlet 22 when refrigerant is injected through the refrigerant inlet 22. It should be noted that a screw cap 25 is also installed on the refrigerant inlet 22 by external thread. When the screw cap 25 is completely covering the refrigerant inlet 22, the downward protrusion on the bottom surface of the screw cap 25 blocks the top of the injection tube 24, preventing the refrigerant in the piston cylinder 11 from being discharged into the refrigerant inlet 22 along the injection tube 24 when the piston plate 12 moves inside the piston cylinder 11. Conversely, it ensures that the refrigerant in the piston cylinder 11 is discharged into the atomizing nozzle 19 through the second gas pipe 13 when it is squeezed and pushed by the piston cylinder 11.

[0037] The present invention also discloses a second embodiment, which further improves the top structure of the second air pipe 13 and the distribution structure of the atomizing nozzles 19 on the second air pipe 13, such as... Figure 3 , Figure 4 as well as Figure 5 As shown, the inner end of the exhaust pipe 4 is provided with a baffle 23 fixed to the top surface of the inner cavity of the container 1. The second exhaust pipe 13 is spiral-shaped and located below the baffle 23. Several atomizing nozzles 19 on the second exhaust pipe 13 are equidistantly distributed along the spiral shape at the top of the second exhaust pipe 13, with the nozzles of the atomizing nozzles 19 facing upwards and towards the inside of the baffle 23. After the refrigerant from the second exhaust pipe 13 is sprayed out by the atomizing nozzles 19, it is concentrated inside the baffle 23. The refrigerant gas obtained after reacting with the high-temperature gas and refrigerant in the container 1 can be circulated more concentratedly through the exhaust pipe 4 into the engine, thus improving engine cooling.

[0038] The outer circular surface of the piston plate 12 is provided with rounded corners. The piston plate 12 slides against the inner wall of the piston cylinder 11 through the rounded corners on the outer circular surface, which improves the smoothness and makes the structure reasonable.

[0039] The orientations mentioned above do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0040] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automotive expansion tank assembly, characterized in that, It includes a kettle body (1) filled with refrigerant and a bypass assembly (2) disposed in the kettle body (1). The kettle body (1) is provided with an air inlet pipe (3) and an air outlet pipe (4) on both sides. A side pipe (5) is connected to the air inlet pipe (3), and the other end of the side pipe (5) extends into the kettle body (1). The bypass assembly (2) includes a bypass pipe (6), one end of which is connected to the side pipe (5) extending into the kettle body (1), and the other end of which is connected to a first gas pipe (8), on which a first gas check valve (9) is installed; the bypass assembly (2) also includes a pressure relief and exhaust mechanism (10), which includes a piston cylinder (11) and a piston plate (12) slidably fitted within the piston cylinder (11). The piston cylinder (11) contains a refrigerant. One end of the piston cylinder (11) is connected to the first gas pipe (8), which extends from the bottom side wall of the piston cylinder (11). The other end of the piston cylinder (11) extends below the outlet pipe (4) and is connected to a second gas pipe (13). One end of the first gas pipe (8) extending from the side wall of the piston cylinder (11) is connected to an air bladder (14) located at the bottom of the piston cylinder (11). The air bladder (14) is also connected to the piston cylinder (11) via a metal pipe (15). On the piston cylinder (11), the first gas pipe (8) and the metal pipe (15) are both located on one side of the piston plate (12). The piston cylinder (11) is provided with a partition plate (17) separating the first gas pipe (8) and the metal pipe (15), so that a gas collecting chamber (16) connecting the metal pipe (15) is formed between the partition plate (17) and the piston plate (12). A second gas check valve (18) is installed on the metal pipe (15). The opening pressure of the second gas check valve (18) is greater than that of the first gas pipe (8). The opening pressure of the one-way valve (9); a row of liquid suction pipes (26) are installed on the piston cylinder (11). The liquid suction pipes (26) are evenly distributed along the length direction of the piston cylinder (11). The piston cylinder (11) is vertically downward and extends into the refrigerant in the pot body (1). Each of the liquid suction pipes (26) is equipped with a liquid one-way valve (27). When the piston plate (12) retracts in the reverse direction in the piston cylinder (11), it replenishes the refrigerant from the pot body (1) to the piston cylinder (11) through negative pressure suction. The second air pipe (13) is provided with a plurality of atomizing nozzles (19) facing the inner end of the air outlet pipe (4). The piston cylinder (11) is filled with a spring (20). One end of the spring (20) is connected to the piston plate (12), and the other end of the spring (20) is connected to the end of the piston cylinder (11) where the second air pipe (13) is installed.

2. The automotive expansion tank assembly according to claim 1, characterized in that, The bypass pipe (6) includes a variable diameter section (21), the inner diameter of which gradually decreases from the end facing the side pipe (5) to the end facing the first air pipe (8).

3. The automotive expansion tank assembly according to claim 2, characterized in that, The spring (20) is a cylindrical spring.

4. The automotive expansion tank assembly according to claim 3, characterized in that, The inner diameter of the spring (20) is larger than that of the second air pipe (13), and the diameter of the second air pipe (13) is smaller than that of the piston cylinder (11).

5. The automotive expansion tank assembly according to claim 4, characterized in that, The top of the kettle body (1) is provided with a refrigerant injection port (22), which is close to the gas outlet pipe (4). An injection pipe (24) located at the top of the kettle body (1) is connected to the refrigerant injection port (22). The other end of the injection pipe (24) passes through the top of the kettle body (1) and into the kettle body (1) and is connected to the piston cylinder (11). One end of the injection pipe (24) connected to the refrigerant injection port (22) enters the refrigerant injection port (22) and is on the same axis as the inner hole of the refrigerant injection port (22) with the opening facing upward.

6. The automotive expansion tank assembly according to claim 5, characterized in that, A cap (25) is fitted onto the refrigerant injection port (22) via an external thread.

7. The automotive expansion tank assembly according to claim 6, characterized in that, The inner end of the air outlet pipe (4) is provided with a baffle (23) fixed on the top surface of the inner cavity of the pot body (1). The top end of the second air pipe (13) is vortex-shaped and located below the baffle (23). A plurality of atomizing nozzles (19) are equidistantly arranged along the vortex-shaped portion at the top end of the second air pipe (13), and the nozzle of the atomizing nozzle (19) faces upward toward the baffle (23).

8. The automotive expansion tank assembly according to claim 7, characterized in that, When the piston plate (12) moves along the inner wall of the piston cylinder (11) toward the direction of the second gas pipe (13), the liquid one-way valve (27) closes. When the piston plate (12) moves along the inner wall of the piston cylinder (11) toward the direction of the metal pipe (15), the liquid one-way valve (27) opens and pumps refrigerant into the piston cylinder (11) through the liquid extraction pipe (26).

9. The automotive expansion tank assembly according to claim 8, characterized in that, The outer surface of the piston plate (12) is provided with rounded corners, and the piston plate (12) slides in contact with the inner wall of the piston cylinder (11) through the rounded corners on the outer surface.

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