Pressure cover of expansion tank

Abstract

The utility model discloses an expansion box pressure cover which comprises a gland and a lining, and the lining is fixedly connected to the inner side of the gland. A cavity is formed in the lining, a first air channel communicated with the cavity is formed in the bottom of the lining, a second air channel communicated with the cavity is formed in the side wall of the lining, and a valve element assembly is installed in the cavity and used for keeping internal and external pressure balance. Two annular grooves are formed in the outer side wall of the lining, a first O-shaped sealing ring and a second O-shaped sealing ring are arranged in the two annular grooves respectively, and the second air channel is located between the first O-shaped sealing ring and the second O-shaped sealing ring. According to the double-seal pressure cover, the double-seal ring design is adopted, a double-barrier system is formed, the sealing efficiency is improved, the design is excellent in performance when applied to higher pressure or severe environments, cooling liquid leakage is effectively prevented, and air tightness is ensured.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, and more specifically, to an expansion chamber pressure cover. Background Technology

[0002] The expansion tank pressure cap is a critical component in the operation of an automotive cooling system. It includes a pressure-reducing valve and a vacuum valve. The pressure-reducing valve maintains high pressure in the cooling system and regulates that pressure, while the vacuum valve prevents the cooling system pressure from becoming a vacuum and regulates that vacuum pressure.

[0003] When a car is in motion, high-temperature coolant and gases overflowing from the engine or radiator enter the expansion tank. Over time, the pressure in the expansion tank increases. When it reaches the designed opening pressure, the pressure relief valve opens to release pressure. When the system pressure approaches the opening pressure, the pressure relief valve closes to ensure the cooling system maintains a certain pressure. When the engine is turned off, the coolant temperature in the cooling system gradually decreases, causing the system to change from high temperature and high pressure to low temperature and low pressure, and even creating a vacuum. When a vacuum occurs in the system pressure, the vacuum valve opens, allowing air to enter the expansion tank and pressurize the system to reach or approach atmospheric pressure.

[0004] Chinese utility model patent specification CN202832757U discloses a pressure cover for an automotive expansion tank, which includes an outer shell and a valve that integrates the functions of a pressure reducing valve and a vacuum valve inside the outer shell. Although the pressure cover allows gas to be discharged from or flow into the expansion tank in a very short time, thus improving the speed of pressure relief or pressure replenishment, the sealing performance of the pressure cover is relatively poor, and leakage of water or liquid is likely to occur, especially in high temperature and high pressure environments.

[0005] To address these issues, an expansion chamber pressure cover was proposed. Utility Model Content

[0006] The purpose of this invention is to provide an expansion chamber pressure cover that overcomes the aforementioned defects in the prior art.

[0007] The first technical solution to achieve the purpose of this utility model is: an expansion tank pressure cover, including a cover and an inner liner, wherein the inner liner is fixedly connected to the inner side of the cover; the inner liner has a cavity, the lower part of the inner liner has a first air passage communicating with the cavity, the side wall of the inner liner has a second air passage communicating with the cavity, the second air passage is connected to atmospheric pressure through the air passage, and the first air passage is connected to the interior of the expansion tank; a valve core assembly is installed inside the cavity, the valve core assembly is used to maintain internal and external pressure balance; the outer side wall of the inner liner has two annular grooves, the two annular grooves are respectively provided with a first O-ring and a second O-ring, and the second air passage is located between the first O-ring and the second O-ring.

[0008] In a preferred embodiment, the valve core assembly includes, from top to bottom, a large spring support, a large spring, a valve plate, a small spring support, and a small spring; the large spring support is fixedly installed on the inner liner cavity, one end of the large spring abuts below the large spring support and the other end abuts above the valve plate; one end of the small spring abuts the inner liner bottom and the other end abuts below the small spring support; the small spring support has an upward protrusion, and the valve plate is sleeved above the protrusion of the small spring support, and the valve plate, under the action of the large spring and the small spring, is used to isolate or connect the first air passage and the second air passage.

[0009] In a preferred embodiment, the valve core assembly further includes a sealing gasket, which is fitted over the small spring support protrusion and located below the valve plate, with a gap between the valve plate and the small spring support protrusion.

[0010] In a preferred embodiment, the bottom of the large spring support has a downward protrusion, the upper end of the large spring is sleeved on the downward protrusion of the large spring support, and the lower end is sleeved on the protrusion of the small spring support.

[0011] In a preferred embodiment, the small spring support has a lower groove, the inner substrate has an upward protrusion at its center, and the upper end of the small spring is disposed in the groove of the small spring support, while the lower end is fitted onto the protrusion at the center of the inner substrate.

[0012] In a preferred embodiment, the valve plate is made of stainless steel and the sealing gasket is made of rubber.

[0013] In a preferred embodiment, the gland is threaded for threaded connection with the corresponding expansion box.

[0014] In a preferred embodiment, the cover body of the pressure cap is provided with a plurality of protrusions evenly distributed circumferentially on its outer side.

[0015] By adopting the above technical solution, this utility model has the following beneficial effects:

[0016] (1) The double-sealed pressure cover of this utility model adopts a double-sealing ring design to form a double barrier system, which improves the sealing efficiency. This design performs well in applications involving higher pressure or harsh environments, effectively preventing coolant leakage and ensuring airtightness. By setting a first air passage (leading to the inside of the expansion tank) and a second air passage (leading to the outside or compensation tank), the internal and external pressures are automatically balanced in conjunction with the valve core assembly. This helps to maintain the stable working state of the cooling system and avoid overheating or leakage caused by abnormal pressure.

[0017] (2) The upper and lower springs work together to enable the valve plate to open or close flexibly according to the changes in system pressure, resulting in faster response and more precise adjustment; the multi-component combination structure can reduce wear of individual components and extend service life; the modular structure makes it easy to assemble and replace parts, reducing maintenance costs.

[0018] (3) The rubber gasket of this utility model provides additional sealing protection to prevent gas or liquid from leaking from the inside of the valve core assembly. The rubber material has a certain elastic buffering capacity to reduce the impact of mechanical shock on the valve core.

[0019] (4) The large spring of this utility model ensures that the spring does not deviate during the movement through the protrusion structure, maintains good axial guidance, and the end of the spring is restricted on the protrusion, making it less likely to fall off, thus improving the overall structural stability.

[0020] (5) The small spring of this utility model is fixed by the groove and the protrusion structure, so that the small spring is installed firmly and is not easy to tilt or slide.

[0021] (6) The stainless steel material of this utility model is corrosion resistant and has high strength, making it suitable for long-term operation in high temperature and high pressure environments. The rubber material has good elasticity and sealing properties, and can adapt to deformation at different temperatures to ensure sealing effect.

[0022] (7) The threaded connection of this utility model has good fastening, avoiding loosening and leakage. Users or maintenance personnel can quickly unscrew / tighten the cover, which is convenient for daily inspection and replenishment of coolant.

[0023] (8) The raised structure on the cap of this utility model increases the friction between the fingers and the cap, making it easier to tighten or loosen manually, especially when hands are wet or gloves are worn. Attached Figure Description

[0024] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0025] Figure 1 This is a perspective view of the present invention.

[0026] The labels in the attached diagram are as follows: 1. Gland; 2. Liner; 3. First O-ring seal; 4. Second O-ring seal; 5. Large spring support; 6. Large spring; 7. Valve plate; 8. Sealing gasket; 9. Small spring support; 10. Small spring. Detailed Implementation

[0027] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of the embodiments of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The utility model will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this utility model and should not be used to limit the scope of protection of this utility model.

[0033] (Example 1)

[0034] An expansion tank pressure cover includes a pressure cover 1 and an inner liner 2, the inner liner 2 being fixedly connected to the inner side of the pressure cover 1. The inner liner 2 has a cavity, and its bottom has a first air passage communicating with the cavity. The first air passage consists of multiple air passage holes arranged around the center of the bottom of the inner liner 2. The sidewall of the inner liner 2 has a second air passage communicating with the cavity, the second air passage consisting of multiple air passage holes evenly arranged along the sidewall of the inner liner 2. The second air passage is connected to atmospheric pressure, and the first air passage is connected to the interior of the expansion tank. The outer sidewall of the inner liner 2 has two annular grooves, each containing a first O-ring seal 3 and a second O-ring seal 4. The first O-ring seal 3 and the second O-ring seal 4 are respectively adapted to the corresponding expansion tank openings. The second air passage is located between the first O-ring seal 3 and the second O-ring seal 4, forming a double-barrier system that improves sealing efficiency. This design performs well in applications involving higher pressures or harsh environments, effectively preventing coolant leakage and ensuring airtightness. By setting up a first air passage (leading to the inside of the expansion tank) and a second air passage (leading to the outside or the compensation tank), and in conjunction with the valve core assembly, automatic pressure balance between the inside and outside is achieved; this helps to maintain the stable working state of the cooling system and avoid overheating or leakage caused by abnormal pressure.

[0035] A valve core assembly is installed inside the cavity to maintain internal and external pressure balance. The valve core assembly includes, from top to bottom, a large spring support 5, a large spring 6, a valve plate 7, a sealing gasket 8, a small spring support 9, and a small spring 10. The large spring support 5 is fixedly installed on the cavity of the inner liner 2. One end of the large spring 6 rests below the large spring support 5, and the other end rests above the valve plate 7. The sealing gasket 8 is fitted onto the protrusion of the small spring support 9 and is located below the valve plate 7. The valve plate 7 and... A gap is provided between the protrusions of the small spring support 9; the inner cavity of the liner 2 is provided with an annular boss that matches the valve plate 7 and the sealing gasket 8; the valve plate 7 and the sealing gasket 8 are movably mounted on the annular boss; one end of the small spring 10 abuts against the bottom of the liner 2, and the other end abuts against the bottom of the small spring support 9; the small spring support 9 is provided with an upward protrusion, and the valve plate 7 is sleeved on the top of the protrusion of the small spring support 9. Under the action of the large spring 6 and the small spring 10, the valve plate 7 is used to isolate or connect the first air passage and the second air passage. This allows the valve plate to flexibly open or close according to changes in system pressure, with faster response and more precise adjustment; the multi-component combination structure can reduce wear of individual components and extend service life; the modular structure is easy to assemble and replace parts, reducing maintenance costs; the rubber gasket provides additional sealing protection to prevent gas or liquid from leaking from inside the valve core assembly; the rubber material has a certain elastic buffering capacity to reduce the impact of mechanical shock on the valve core.

[0036] Furthermore, the large spring support 5 has a downward protrusion at its bottom. The upper end of the large spring 6 is fitted onto the downward protrusion of the large spring support 5, and the lower end is fitted onto the protrusion of the small spring support 9. The small spring support 9 has a lower groove, and the bottom center of the inner liner 2 has an upward protrusion. The upper end of the small spring 10 is located in the groove of the small spring support 9, and the lower end is fitted onto the protrusion at the bottom center of the inner liner 2. This ensures that the spring does not shift during movement, maintains good axial guidance, and the spring end is restricted on the protrusion, making it less likely to fall off, thus improving the overall structural stability.

[0037] Furthermore, valve plate 7 is made of stainless steel, and sealing gasket 8 is made of rubber. Stainless steel is corrosion-resistant and has high strength, making it suitable for long-term operation in high-temperature and high-pressure environments. Rubber has good elasticity and sealing properties, and can adapt to deformation at different temperatures, ensuring a good sealing effect.

[0038] Furthermore, the gland 1 is threaded for connection with the corresponding expansion tank thread; multiple protrusions are evenly distributed circumferentially on the outer side of the gland 1. The threaded connection provides good tightness, preventing loosening and leakage, and allows users or maintenance personnel to quickly unscrew / tighten the cap for convenient daily inspection and coolant replenishment. The protruding structure on the gland increases the friction between fingers and the cap, making it easier to manually tighten or loosen, especially safer when hands are wet or gloves are worn.

[0039] When this pressure cover is in use, when the pressure in the system is balanced, the sealing gasket 8 is tightly fitted with the small spring support 9 and the inner liner 2 respectively, isolating the first air passage and the second air passage.

[0040] When the pressure inside the system is lower than atmospheric pressure, under the action of atmospheric pressure, the small spring support 9 moves downward and separates from the sealing gasket 8. Through the gap between the small spring support 9, the sealing gasket 8 and the valve plate, the first air passage and the second air passage are connected, so that the internal and external pressures are gradually balanced.

[0041] When the pressure inside the system is higher than atmospheric pressure, the small spring support 9 moves upward under the action of the internal air pressure. The small spring support 9 drives the sealing gasket 8 to move upward, so that the sealing gasket 8 separates from the inner liner 2, so that the first air passage and the second air passage are connected, and the internal and external pressures gradually balance.

[0042] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An expansion chamber pressure cover, characterized in that: The device includes a pressure cap (1) and an inner liner (2). The inner liner (2) is fixedly connected to the inner side of the pressure cap (1). The inner liner (2) has a cavity inside. The bottom of the inner liner (2) is provided with a first air passage that communicates with the cavity. The side wall of the inner liner (2) is provided with a second air passage that communicates with the cavity. The second air passage is connected to atmospheric pressure through the air passage. The first air passage is connected to the inside of the expansion chamber. A valve core assembly is installed inside the cavity. The valve core assembly is used to maintain the internal and external pressure balance. The outer side wall of the inner liner (2) is provided with two annular grooves. A first O-ring seal (3) and a second O-ring seal (4) are respectively provided in the two annular grooves. The second air passage is located between the first O-ring seal (3) and the second O-ring seal (4).

2. The expansion chamber pressure cover according to claim 1, characterized in that: The valve core assembly includes, from top to bottom, a large spring support (5), a large spring (6), a valve plate (7), a small spring support (9), and a small spring (10); the large spring support (5) is fixedly installed on the cavity of the inner liner (2), one end of the large spring (6) abuts below the large spring support (5) and the other end abuts above the valve plate (7); one end of the small spring (10) abuts the bottom of the inner liner (2) and the other end abuts below the small spring support (9); the small spring support (9) has an upward protrusion, and the valve plate (7) is sleeved above the protrusion of the small spring support (9). Under the action of the large spring (6) and the small spring (10), the valve plate (7) is used to isolate or connect the first air passage and the second air passage.

3. The expansion chamber pressure cover according to claim 2, characterized in that: The valve core assembly also includes a sealing gasket (8), which is sleeved on the protrusion of the small spring support (9) and located below the valve plate (7), and there is a gap between the valve plate (7) and the protrusion of the small spring support (9); the inner cavity of the liner (2) is provided with an annular boss that is adapted to the valve plate (7) and the sealing gasket (8); the valve plate (7) and the sealing gasket (8) are movably mounted on the annular boss.

4. The expansion chamber pressure cover according to claim 3, characterized in that: The bottom of the large spring support (5) is provided with a downward protrusion. The upper end of the large spring (6) is sleeved on the downward protrusion of the large spring support (5), and the lower end is sleeved on the protrusion of the small spring support (9).

5. The expansion chamber pressure cover according to claim 4, characterized in that: The small spring support (9) has a lower groove, the bottom center of the inner liner (2) has an upward protrusion, the upper end of the small spring (10) is located in the groove of the small spring support (9), and the lower end is fitted onto the protrusion at the bottom center of the inner liner (2).

6. The expansion chamber pressure cover according to claim 5, characterized in that: The valve plate (7) is made of stainless steel, and the sealing gasket (8) is made of rubber.

7. The expansion chamber pressure cover according to claim 1, characterized in that: The pressure cap (1) is threaded for threaded connection with the corresponding expansion box.

8. The expansion chamber pressure cover according to claim 1, characterized in that: The cover (1) has multiple protrusions evenly arranged on the outer circumference of the cover body.

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