An automatic drain valve structure based on cavity pressure differential drive

Abstract

This utility model relates to the field of drainage technology for gas storage systems, and particularly to an automatic drainage valve structure driven by cavity pressure difference. It includes a hot-plug nut, with a drainage end cap connected inside the nut. One end of the drainage end cap has a second drainage hole. A valve body is slidably connected inside the nut, and a valve core block is disposed inside the valve body. The surface of the valve core block has an installation hole and a first drainage channel, and an umbrella-shaped one-way valve is installed inside the installation hole. This utility model, by setting an umbrella-shaped one-way valve and a valve core block that cooperates with the drive column to seal the plug, achieves automatic collection and discharge of condensate from the gas storage tank, eliminating the need for external electrical control or manual operation, thus improving the timeliness of drainage and the reliability of system operation. This structure utilizes the pressure difference change between the gas storage tank and the water storage chamber to drive the water discharge action, and automatically resets by a spring after the pressure difference disappears, forming a complete self-circulating drainage process.

Description

Technical Field

[0001] This utility model relates to the field of drainage technology for gas storage systems, specifically an automatic drainage valve structure driven by cavity pressure difference. Background Technology

[0002] In a vehicle's air pressure braking system, the air reservoir, as the unit carrying compressed air, continuously accumulates condensate from the air during operation. If this condensate cannot be drained in time, it will not only occupy the air storage space and reduce the effective volume, but may also enter the braking circuit with the airflow, causing problems such as valve corrosion and air passage blockage, and in severe cases, even affecting the vehicle's braking response performance. Therefore, timely drainage of condensate from the air reservoir is a crucial step in ensuring the safe and stable operation of the air pressure system.

[0003] In existing technologies, drainage is often achieved through manual operation of a drain valve or by equipping an electronically controlled automatic drainage device. However, manual drainage suffers from problems such as reliance on driver intervention, delayed execution, and incomplete drainage. While electronically controlled drainage systems offer automatic control, they are complex, costly, susceptible to environmental influences, and lack reliability over long-term operation. Furthermore, some structures are bulky and unsuitable for integration into the space-constrained bottom area of ​​gas storage tanks, failing to meet the requirements for lightweight and miniaturized installation. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide an automatic drain valve structure based on cavity pressure difference drive, which aims to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An automatic drain valve structure based on cavity pressure differential drive includes a hot-plug nut, a drain end cap connected inside the hot-plug nut, and a second drain hole opened at one end of the drain end cap. A valve body is slidably connected inside the hot-plug nut, and a valve core block is provided inside the valve body. An installation hole and a first drain channel are opened on the surface of the valve core block, and an umbrella-shaped one-way valve is installed inside the installation hole. A spring is installed on the surface of the first drain channel.

[0007] The drain end cap is provided with a drive column inside, and a moving valve block and a sealing plug are respectively provided at both ends of the drive column. The surface of the moving valve block is provided with several second drain channels.

[0008] Furthermore, the umbrella-shaped one-way valve includes an umbrella-shaped valve head, which is made of an elastic material, and the position of the umbrella-shaped valve head corresponds to that of the first drainage channel.

[0009] Furthermore, the surface of the umbrella-shaped one-way valve is provided with protrusions, and the protrusions and the umbrella-shaped valve head respectively abut against the two end surfaces of the valve core block.

[0010] Furthermore, the sealing plug has a conical structure and is installed through the second drain hole.

[0011] Furthermore, the drain end cap is detachably connected to the hot-plug nut;

[0012] The outer surface of the drain end cap and the inner wall of the hot-plug nut are respectively provided with a first engagement thread and a second engagement thread, and the drain end cap and the hot-plug nut are screwed together for fixed connection through thread engagement.

[0013] Furthermore, the moving valve block is detachably connected to the valve body;

[0014] The outer surface of the moving valve block and the inner wall of the valve body are respectively provided with a third engagement thread and a fourth engagement thread, and the moving valve block and the valve body are fixedly connected by thread engagement.

[0015] Furthermore, a plurality of first sealing rubber rings are provided between the valve body and the hot-plug nut.

[0016] Furthermore, a number of second sealing rubber rings are provided between the hot-plug nut and the drain end cap.

[0017] The automatic drain valve structure based on cavity pressure difference driven provided by this utility model has the following beneficial effects:

[0018] This invention provides an automatic drain valve structure driven by cavity pressure difference. By incorporating an umbrella-shaped check valve, a valve core block, and a sealing plug in conjunction with the drive column, it achieves automatic collection and discharge of condensate from the air tank, eliminating the need for external electrical control or manual operation, thus improving the timeliness of drainage and the reliability of system operation. This structure utilizes the pressure difference between the air tank and the water storage chamber to drive the water discharge action, and automatically resets with a spring after the pressure difference disappears, forming a complete self-circulating drainage process. Furthermore, the structure is compact, integrated into a hot-swappable nut for easy installation and replacement; multiple sets of sealing rubber rings are placed at key connection points to effectively ensure the overall sealing performance, making it suitable for scenarios with limited space and high requirements for sealing performance and ease of maintenance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an automatic drain valve structure driven by cavity pressure difference and an air storage tank.

[0020] Figure 2 This is a partial three-dimensional structural diagram of the connection between an automatic drain valve structure driven by cavity pressure difference and an air storage tank.

[0021] Figure 3This is a partial three-dimensional structural diagram of an automatic drain valve structure driven by cavity pressure difference connected to an air storage tank from an overhead position.

[0022] Figure 4 This is a front cross-sectional view of an automatic drain valve structure driven by cavity pressure difference and an air storage tank.

[0023] Figure 5 An automatic drain valve structure based on cavity pressure differential drive Figure 4 Enlarged view of point A.

[0024] In the diagram: 1. Gas reservoir; 2. Hot-swappable nut; 3. First drain hole; 4. Drain end cap; 5. Sealing plug; 6. Pre-set protruding mounting part; 7. Drive column; 8. Second drain hole; 9. Valve body; 10. Valve core block; 11. Mounting hole; 12. Spring; 13. Umbrella-shaped check valve; 14. First drain channel; 15. Second drain channel; 16. Moving valve block. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0027] like Figures 1-5 As shown in the figure, an automatic drain valve structure based on cavity pressure difference drive provided by this utility model embodiment includes an air storage cylinder 1, and a first drain hole 3 is provided on the surface of the air storage cylinder 1. A preset protruding mounting part 6 is provided on the surface of the air storage cylinder 1 during injection molding.

[0028] The interior of the pre-set protruding mounting part 6 is fixedly installed with a hot-plug nut 2 by a hot-plug process. The interior of the hot-plug nut 2 is connected with a drain end cap 4, and one end of the drain end cap 4 is provided with a second drain hole 8.

[0029] A valve body 9 is slidably connected inside the hot-swappable nut 2, and a valve core block 10 is provided inside the valve body 9. The surface of the valve core block 10 has a mounting hole 11 and a first drainage channel 14. An umbrella-shaped one-way valve 13 is installed inside the mounting hole 11, and a spring 12 is installed on the surface of the first drainage channel 14. One end of the spring 12 abuts against the valve core block 10, and the other end abuts against the surface of the air storage cylinder.

[0030] The umbrella-shaped check valve 13 includes an umbrella-shaped valve head made of an elastic material, and the position of the umbrella-shaped valve head corresponds to that of the first drainage channel 14. The surface of the umbrella-shaped check valve 13 is provided with protrusions, and the protrusions and the umbrella-shaped valve head respectively abut against the two end surfaces of the valve core block 10.

[0031] The drain end cap 4 has a drive column 7 inside, and a moving valve block 16 and a sealing plug 5 are respectively provided at both ends of the drive column 7. The surface of the moving valve block 16 has several second drain channels 15. The sealing plug 5 has a conical structure and is installed through the second drain hole 8.

[0032] In one embodiment of this invention, as the air pressure inside the air storage cylinder 1 gradually increases to the working range, the water vapor in the compressed air gradually condenses into liquid water and settles at the bottom of the air storage cylinder. Through the first drain hole 3, the condensed water enters the valve body chamber 9 inside the hot-plug nut 2 under the pressure of the air. At this time, the air pressure inside the air storage cylinder is higher than the pressure inside the valve core block 10, and the water enters through the first drain channel 14 opened on the valve core block 10 under the action of the pressure difference.

[0033] Because an umbrella-shaped check valve 13 is provided at the inlet of the first drainage channel 14, and the umbrella-shaped valve head is made of elastic material, the umbrella-shaped valve head will elastically open under the action of water pressure, allowing water to flow from the first drainage channel 14 into the drainage channel system. After passing through the first drainage channel 14, the water enters several second drainage channels 15 provided on the moving valve block 16, and finally collects at the inner bottom of the drainage end cover 4. During this stage, the water is temporarily stored, and a pressure isolation is formed between the air storage tank and the drainage area.

[0034] When the vehicle brakes or other conditions cause a rapid drop in pressure within the air reservoir 1, a reverse pressure difference is created between the air reservoir cavity and the water reservoir cavity, meaning the pressure inside the water reservoir cavity is greater than that inside the air reservoir cavity. At this time, the air pressure in the water reservoir cavity pushes the drive column 7 upwards, causing the sealing plug 5 at its lower end to disengage from the second drain hole 8, thus opening the drainage channel. Condensate is discharged through the second drain hole 8 under the combined action of gravity and pressure difference. As the pressure in the water reservoir cavity decreases to equilibrium with the air reservoir cavity, the spring 12 pushes the drive column 7 back to its original position, causing the sealing plug 5 to re-close the second drain hole 8, completing the drainage process and entering the next water storage cycle.

[0035] During the drainage process, as the pressure above the umbrella-shaped valve head drops rapidly, the pressure difference it experiences decreases, and the elastic structure causes the umbrella-shaped valve head to automatically reset and return to its initial closed state, thereby blocking the entrance of the first drainage channel 14 and preventing water or gas in the water storage chamber from flowing back into the air storage cylinder, ensuring the one-way and sealing of the drainage process.

[0036] This structure operates entirely without external control devices or manual operation throughout the drainage process, driven solely by pressure changes in the air reservoir, automatically completing the introduction, collection, and discharge of condensate. The umbrella-shaped one-way valve 13 enables unidirectional liquid entry and gas isolation, effectively preventing condensate backflow. The valve core block 10 integrates the first drainage channel 14 and mounting hole 11, featuring a compact structure. It, along with the hot-plug nut 2, forms a stable and sealed mounting connection with the pre-set protruding mounting part 6 in the air reservoir. The drain end cap 4 and the hot-plug nut 2 are connected by a detachable threaded connection, facilitating maintenance and replacement, and enhancing the maintainability and practicality of the device.

[0037] With its compact overall structure and strong adaptability, it is particularly suitable for gas storage system scenarios where space is limited but drainage reliability is required, and has good application value and promotion prospects.

[0038] In this embodiment, the drain end cap 4 and the hot-plug nut 2 are detachably connected together; the outer surface of the drain end cap 4 and the inner wall of the hot-plug nut 2 are respectively provided with a first engagement thread and a second engagement thread, and the drain end cap 4 and the hot-plug nut 2 are screwed together for fixed connection through thread engagement. This structural design has many practical advantages.

[0039] On the one hand, this threaded connection ensures a secure connection between the drain end cap and the hot-plug nut, providing excellent sealing performance, preventing condensate or gas leakage, and ensuring the stability and sealing reliability of the drain valve under high-pressure environments. On the other hand, the threaded disassembly structure facilitates later maintenance and replacement. When internal parts become clogged, aged, or damaged, they can be quickly disassembled and reassembled by unscrewing the drain end cap without damaging the overall structure, reducing maintenance costs, improving repair efficiency, and enhancing the maintainability and service life of the product.

[0040] In addition, this threaded connection has a simple structure and low manufacturing cost. Without affecting the overall size and compactness, it improves the flexibility of the assembly process and is easy to apply to the drainage systems of different types of air storage tanks.

[0041] In this embodiment, the movable valve block 16 is detachably connected to the valve body 9; the outer surface of the movable valve block 16 and the inner wall of the valve body 9 are respectively provided with a third engagement thread and a fourth engagement thread, and the movable valve block 16 and the valve body 9 are screwed together for fixed connection through thread engagement. This structural design helps to realize the modular combination of internal functional components, while enhancing the flexibility and maintainability of structural assembly.

[0042] This threaded connection method allows for quick disassembly or replacement of the moving valve block 16 when needed, while ensuring a reliable connection. It is especially suitable for scenarios that require regular inspection or replacement after long-term operation. When the channels inside the moving valve block become blocked, worn, or otherwise malfunction, the moving valve block can be directly unscrewed for cleaning or replacement, avoiding the need to disassemble the entire structure and significantly improving maintenance efficiency.

[0043] Meanwhile, this structure facilitates the replacement and adaptation of standardized components during manufacturing, reducing processing and assembly difficulties and improving assembly consistency. The detachable threaded connection not only ensures a stable seal between the moving valve block and the valve body but also extends the service life and maintenance convenience of the entire drainage device, demonstrating excellent engineering applicability.

[0044] In this embodiment, a plurality of first sealing rubber rings are provided between the valve body 9 and the hot-plug nut 2 to seal the sliding connection between the two, preventing gas or condensate from leaking along the mating gap and ensuring the sealing reliability of the valve body 9 when it slides up and down driven by the drive column 7. The first sealing rubber rings form a sealing barrier between the outer periphery of the valve body 9 and the inner wall of the hot-plug nut 2, improving the airtightness and stability of the device under dynamic working conditions.

[0045] Several second sealing rubber rings are provided between the hot-plug nut 2 and the drain end cover 4. The second sealing rubber rings are located between the outer surface of the drain end cover 4 and the inner wall of the hot-plug nut 2, and are used to seal the threaded connection formed by the meshing threads of the two. This structure not only enhances the gas-liquid sealing performance between the hot-plug nut 2 and the drain end cover 4, but also effectively prevents the risk of leakage caused by loose threads under high pressure conditions, thereby improving the reliability of the entire machine.

[0046] Several third sealing rubber rings are provided between the hot-plug nut 2 and the preset protruding mounting part 6. The third sealing rubber rings are used to seal the installation gap between the outer wall of the hot-plug nut 2 and the inner wall of the preset protruding mounting part 6 formed by injection molding on the air tank 1, preventing gas from leaking out from the interface between the drain valve and the air tank 1. This sealing structure ensures good airtightness after the drain valve assembly is installed into the air tank 1 and maintains a stable connection during long-term operation.

[0047] By using a tiered arrangement of the first, second, and third sealing rubber rings, which correspond to key sealing positions such as the internal component connection points of the drain valve, the threaded connection points between components, and the interface between the components and the air storage tank, a dual gas-liquid seal is achieved across the entire path and multiple nodes, significantly improving the sealing performance, safety, and durability of the entire drainage device.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic drain valve structure based on cavity pressure differential drive, comprising a hot-plug nut (2), characterized in that, The hot-plug nut (2) is connected to a drain end cap (4) inside, and a second drain hole (8) is provided at one end of the drain end cap (4). The hot-plug nut (2) is slidably connected to a valve body (9), and a valve core block (10) is provided inside the valve body (9). The surface of the valve core block (10) is provided with an installation hole (11) and a first drain channel (14). An umbrella-shaped one-way valve (13) is installed inside the installation hole (11), and a spring (12) is installed on the surface of the first drain channel (14). The drain end cap (4) is provided with a drive column (7) inside, and a moving valve block (16) and a sealing plug (5) are respectively provided at both ends of the drive column (7). The surface of the moving valve block (16) is provided with several second drain channels (15).

2. The automatic drain valve structure based on cavity pressure difference drive according to claim 1, characterized in that, The umbrella-shaped one-way valve (13) includes an umbrella-shaped valve head, which is made of an elastic material and is positioned corresponding to the first drainage channel (14).

3. The automatic drain valve structure based on cavity pressure difference drive according to claim 2, characterized in that, The surface of the umbrella-shaped one-way valve (13) is provided with protrusions, and the protrusions and the umbrella-shaped valve head respectively abut against the two ends of the valve core block (10).

4. The automatic drain valve structure based on cavity pressure differential drive according to claim 1, characterized in that, The sealing plug (5) has a conical structure and is installed through the second drain hole (8).

5. The automatic drain valve structure based on cavity pressure differential drive according to claim 1, characterized in that, The drain end cap (4) is detachably connected to the hot-plug nut (2); The outer surface of the drain end cap (4) and the inner wall of the hot-plug nut (2) are respectively provided with a first engagement thread and a second engagement thread. The drain end cap (4) and the hot-plug nut (2) are screwed together and fixedly connected by thread engagement.

6. The automatic drain valve structure based on cavity pressure differential drive according to claim 1, characterized in that, The moving valve block (16) is detachably connected to the valve body (9); The outer surface of the moving valve block (16) and the inner wall of the valve body (9) are respectively provided with a third engagement thread and a fourth engagement thread, and the moving valve block (16) and the valve body (9) are fixedly connected by thread engagement.

7. The automatic drain valve structure based on cavity pressure differential drive according to claim 1, characterized in that, Several first sealing rubber rings are provided between the valve body (9) and the hot-plug nut (2).

8. The automatic drain valve structure based on cavity pressure differential drive according to claim 1, characterized in that, Several second sealing rubber rings are provided between the hot-plug nut (2) and the drain end cap (4).

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