Threaded external breather valve

Abstract

The utility model relates to valve technical field especially is a threaded type external breathing valve, including valve body, valve cover and valve core subassembly, gas passage is equipped in the valve body, the valve core subassembly sets up one end at the valve body, the valve cover is buckled in the valve core subassembly outside, and the clearance is formed between valve cover and valve body, the valve core subassembly is used for blocking or conducting gas passage and clearance, one end of the valve body away from the valve core subassembly is equipped with the thread segment, the utility model discloses setting the thread segment on the valve body for breathing valve threaded connection, and the fastener cooperation is saved when the thread segment installs, and the installation step and processing will be more simple, and the production cost greatly reduces.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a threaded external breather valve. Background Technology

[0002] A breather valve is a valve that ensures the storage tank is isolated from the atmosphere within a certain pressure range, while allowing it to breathe when the pressure exceeds or falls below this range. Its function is to prevent damage to the storage tank due to overpressure or vacuum, and to reduce evaporation losses of the stored liquid. Installing a breather valve not only reduces gas emissions from the tank, thus lowering atmospheric pollution, but also prevents damage from overpressure or instability from excessive vacuum, contributing to both safety and environmental protection. For example, breather valves are installed on oil tankers to adjust the pressure difference between the inside and outside of the tank.

[0003] Existing breather valves are usually installed on the tank body using flange connections, and require fasteners such as bolts and nuts to lock the flange in place. This makes the installation process cumbersome, and the processing of the flange greatly increases production costs.

[0004] The purpose of this invention is to propose corresponding solutions to the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a threaded external breather valve. This utility model has a threaded section on the valve body for the breather valve to be threadedly connected. The threaded section eliminates the need for fasteners during installation, making the installation steps and processing simpler and greatly reducing production costs.

[0006] The technical solution adopted by this utility model is as follows: a threaded external breather valve, including a valve body, a valve cover and a valve core assembly. The valve body is provided with a gas channel. The valve core assembly is disposed at one end of the valve body. The valve cover is fastened to the outside of the valve core assembly, and a gap is formed between the valve cover and the valve body. The valve core assembly is used to block or open the gas channel and the gap. The end of the valve body away from the valve core assembly is provided with a threaded section.

[0007] The threaded section includes an external thread disposed on the outer wall of the valve body, and a limiting ring is radially protruding on the outer wall of the valve body, the diameter of the limiting ring being larger than the diameter of the external thread.

[0008] It also includes a vent cap and a hemispherical core. The threaded section includes an internal thread provided on the inner wall of the valve body. The end of the vent cap is threadedly connected to the internal thread, and the outer wall of the vent cap has several vent holes distributed circumferentially. The vent holes are connected to the gas channel. The hemispherical core is movably disposed between the vent cap and the valve body. The inner wall of the valve body is also provided with a valve seat for sealing and engaging with the hemispherical core. When the valve seat and the hemispherical core are sealed and engaged, the vent holes are blocked from the gas channel.

[0009] The valve seat is provided with a sealing ring for sealing with the hemispherical core.

[0010] The valve body is also equipped with a filter element that separates the gas passage. The filter element has a cavity inside, and several first air passage holes are penetrating the upper and lower surfaces of the filter element. The cavity is connected to the gas passage through the first air passage holes.

[0011] The filter element is further provided with an inner partition plate that separates the cavity. Several second air passages are passed through the inner partition plate, and the second air passages are staggered with the first air passages.

[0012] The valve body has two retaining rings attached to its inner wall, and the filter element is abutted between the two retaining rings.

[0013] The valve core assembly includes a positive pressure valve disc, a negative pressure valve disc, a positive pressure spring, a negative pressure spring, and a valve stem. The positive pressure valve disc abuts against the end of the valve body, and the negative pressure valve disc abuts against the end face of the positive pressure valve disc near the valve body. The positive pressure valve disc has a connecting hole along the axial direction, and a gap is formed between the negative pressure valve disc and the valve body. The positive pressure spring is installed between the valve cover and the positive pressure valve disc. The valve stem passes through the positive pressure valve disc and connects to the negative pressure valve disc. The end of the valve stem away from the negative pressure valve disc has a plug-in component. The negative pressure spring is sleeved on the outside of the valve stem, and one end of the negative pressure spring abuts against the plug-in component while the other end abuts against the positive pressure valve disc.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a threaded section on the valve body for the threaded connection of the breather valve. The threaded section eliminates the need for fasteners during installation. That is, the breather valve can be installed by tightening the threaded section to the interface of the tanker body. The installation steps and processing are much simpler, which greatly reduces the production cost. In addition, the breather valve can be installed externally on the tanker, allowing for easy observation of the breather valve's working condition and facilitating maintenance. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0016] Figure 1 This is a schematic diagram of the structure of the threaded external breather valve of this utility model;

[0017] Figure 2 This is a cross-sectional view of the present invention;

[0018] Figure 3 This is a cross-sectional view of the present invention from another perspective;

[0019] In the diagram, 1-valve body, 2-valve cover, 3-gas passage, 4-gap, 5-threaded section, 6-external thread, 7-limiting ring, 8-vent cover, 9-hemispherical core, 10-internal thread, 11-vent hole, 12-valve seat, 13-sealing ring, 14-filter element, 15-cavity, 16-first vent hole, 17-inner partition, 18-second vent hole, 19-clamping ring, 20-positive pressure valve disc, 21-negative pressure valve disc, 22-positive pressure spring, 23-negative pressure spring, 24-valve stem, 25-connecting hole, 26-gap, 27-plug connector. Detailed Implementation

[0020] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0021] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0022] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0023] like Figures 1 to 3As shown, this is an embodiment of the present invention, a threaded external breathing valve, including a valve body 1, a valve cover 2, and a valve core assembly. The valve body 1 has a gas channel 3 inside, the valve core assembly is disposed at one end of the valve body 1, the valve cover 2 is fastened to the outside of the valve core assembly, and a gap 4 is formed between the valve cover 2 and the valve body 1. The valve core assembly is used to block or open the gas channel 3 and the gap 4. The end of the valve body 1 away from the valve core assembly has a threaded section 5.

[0024] The advantages of this design are as follows: This utility model provides a threaded section on the valve body for the threaded connection of the breather valve. The threaded section eliminates the need for fasteners during installation. The breather valve can be installed simply by tightening the threaded section onto the interface of the tanker body. This simplifies the installation process and greatly reduces production costs. Furthermore, the breather valve can be externally mounted on the tanker, allowing for easy monitoring of its operation and facilitating maintenance.

[0025] Further, the threaded segment 5 includes an external thread 6 disposed on the outer wall of the valve body 1, and a limiting ring 7 is radially protruding on the outer wall of the valve body 1, the diameter of the limiting ring 7 being larger than the diameter of the external thread 6.

[0026] The beneficial effects of this design are as follows: the threaded section uses an external thread, which makes it easy to observe whether it is tightened properly. When tightening the external thread, the limiting ring blocks the interface of the tank. The diameter of the limiting ring is larger than the maximum diameter of the external thread, which can prevent the breather valve from rotating excessively and falling into the interface.

[0027] Further configuration includes a vent cover 8 and a hemispherical core 9. The threaded section 5 includes an internal thread 10 on the inner wall of the valve body 1. The end of the vent cover 8 is threadedly connected to the internal thread 10, and the outer wall of the vent cover 8 has several circumferentially distributed vent holes 11. The vent holes 11 are connected to the gas channel 3. The hemispherical core 9 is movably disposed between the vent cover 8 and the valve body 1. The inner wall of the valve body 1 is also provided with a valve seat 12 for sealing with the hemispherical core 9. When the valve seat 12 is sealed with the hemispherical core 9, the vent holes 11 are blocked from the gas channel 3.

[0028] The beneficial effects of this design are as follows: the breather valve is usually installed on the top of the tank. The end of the breather valve connected to the interface is also connected to a vent cap and a hemispherical core via an internal thread. The vent cap and hemispherical core are installed inside the interface. During normal operation, the hemispherical core abuts against the vent cap, and the vent hole on the side of the vent cap remains connected to the gas passage, ensuring the normal operation of the breather valve, i.e., balancing the internal and external pressure difference. However, in emergency situations such as when the tanker truck tipps over, the hemispherical core will move towards the valve body under the action of gravity until it abuts against the valve seat inside the valve body to form a sealing fit, blocking the vent hole and the gas passage, preventing oil and gas leakage from the tanker truck, and improving safety performance.

[0029] Furthermore, the valve seat 12 is provided with a sealing ring 13 for sealing and engaging with the hemispherical core 9.

[0030] The beneficial effects of this design are as follows: by setting a sealing ring, the sealing performance of the valve seat sealing surface is further improved, and when the hemispherical core is sealed with the valve seat and the sealing ring, it is ensured that the vent hole can be completely blocked from the gas passage.

[0031] Furthermore, the valve body 1 is provided with a filter element 14 that separates the gas channel 3. The filter element 14 has a cavity 15 inside. The upper and lower surfaces of the filter element 14 are each provided with a plurality of first air passage holes 16. The cavity 15 is connected to the gas channel 3 through the first air passage holes 16.

[0032] The beneficial effects of this design are as follows: a filter element is installed in the valve body to filter impurities and prevent them from entering the tank and contaminating the oil and gas. The first vent allows for normal connection of the gas passage. The filter element can also serve as a secondary leak prevention device. Even if oil and gas enter the gas passage through the valve seat, it can block the oil and gas and slow down the passage speed. In addition, the filter element can also play a role in flame arrest.

[0033] Furthermore, the filter element 14 is provided with an inner partition 17 that separates the cavity 15. The inner partition 17 has a plurality of second air passage holes 18 through it, and the second air passage holes 18 are staggered with the first air passage holes 16.

[0034] The beneficial effects of this design are as follows: an inner baffle with a second air passage is also provided inside the filter element to further improve the filtration capacity. The second air passage is staggered with the first air passage, i.e., it is not on the same axis. Impurities cannot pass directly through the first air passage and the second air passage in sequence. The impurities are blocked on the inner baffle, which also greatly improves the leakage prevention performance.

[0035] In a further configuration, two retaining rings 19 are engaged with the inner wall of the valve body 1, and the filter element 14 is abutted between the two retaining rings 19.

[0036] The advantages of this design are as follows: the filter element is limited by two retaining rings to prevent it from flipping over; the filter element is detachably installed in the valve body for easy replacement and maintenance.

[0037] Further configuration: The valve core assembly includes a positive pressure valve disc 20, a negative pressure valve disc 21, a positive pressure spring 22, a negative pressure spring 23, and a valve stem 24. The positive pressure valve disc 20 abuts against the end of the valve body 1, and the negative pressure valve disc 21 abuts against the end face of the positive pressure valve disc 20 near the valve body 1. The positive pressure valve disc 20 has a connecting hole 25 along the axial direction, and a gap 26 is formed between the negative pressure valve disc 21 and the valve body 1. The positive pressure spring 22 is installed between the valve cover 2 and the positive pressure valve disc 20. The valve stem 24 passes through the positive pressure valve disc 20 and connects to the negative pressure valve disc 21. The end of the valve stem 24 away from the negative pressure valve disc 21 is provided with a connector 27. The negative pressure spring 23 is sleeved on the outside of the valve stem 24, and one end of the negative pressure spring 23 abuts against the connector 27 and the other end abuts against the positive pressure valve disc 20.

[0038] The beneficial effects of this design are as follows: the valve core assembly is the basic structure for the breather valve to achieve a balance between internal and external pressure differences. During normal operation, the positive pressure valve disc is pressed against the end of the valve body by the positive pressure spring, while the negative pressure valve disc is pressed against the positive pressure valve disc by the negative pressure spring. The negative pressure valve disc blocks the gap and the connecting hole, and the gas passage is closed. When the breather valve needs to release pressure to the outside, that is, when the gas pressure inside the tank is greater than the external gas pressure, the positive pressure spring is compressed, the positive pressure valve disc moves away from the valve body, and the gas passage connects with the gap. When the breather valve needs to increase pressure to the inside, that is, when the gas pressure inside the tank is less than the external gas pressure, the negative pressure spring is compressed by the connector inserted into one end of the valve stem, and at the same time, the valve stem drives the negative pressure valve disc away from the positive pressure valve disc, and the connecting hole connects with the gap. The gas passage connects with the gap through the connecting hole.

[0039] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A threaded external breathing valve, comprising a valve body (1), a valve cover (2), and a valve core assembly, wherein the valve body (1) has a gas passage (3), the valve core assembly is disposed at one end of the valve body (1), the valve cover (2) is externally fastened to the valve core assembly, and a gap (4) is formed between the valve cover (2) and the valve body (1), the valve core assembly is used to block or open the gas passage (3) and the gap (4), characterized in that: The valve body (1) has a threaded section (5) at the end away from the valve core assembly.

2. The threaded external breather valve according to claim 1, characterized in that: The threaded section (5) includes an external thread (6) provided on the outer wall of the valve body (1), and a limiting ring (7) is radially protruding on the outer wall of the valve body (1), the diameter of the limiting ring (7) being larger than the diameter of the external thread (6).

3. The threaded external breather valve according to claim 1, characterized in that: It also includes a vent cover (8) and a hemispherical core (9). The threaded section (5) includes an internal thread (10) provided on the inner wall of the valve body (1). The end of the vent cover (8) is threadedly connected to the internal thread (10), and the outer wall of the vent cover (8) is provided with several vent holes (11) distributed circumferentially. The vent holes (11) are connected to the gas channel (3). The hemispherical core (9) is movably disposed between the vent cover (8) and the valve body (1). The inner wall of the valve body (1) is also provided with a valve seat (12) for sealing with the hemispherical core (9). When the valve seat (12) and the hemispherical core (9) are sealed together, the vent holes (11) and the gas channel (3) are blocked.

4. The threaded external breather valve according to claim 3, characterized in that: The valve seat (12) is provided with a sealing ring (13) for sealing cooperation with the hemispherical core (9).

5. The threaded external breather valve according to claim 1, characterized in that: The valve body (1) is also provided with a filter element (14) that separates the gas passage (3). The filter element (14) has a cavity (15) inside. The upper and lower surfaces of the filter element (14) are both perforated with a number of first air passage holes (16). The cavity (15) is connected to the gas passage (3) through the first air passage holes (16).

6. The threaded external breather valve according to claim 5, characterized in that: The filter element (14) is further provided with an inner partition (17) that separates the cavity (15). The inner partition (17) has several second air passages (18) that pass through it. The second air passages (18) and the first air passages (16) are arranged alternately.

7. The threaded external breather valve according to claim 5, characterized in that: The valve body (1) has two retaining rings (19) attached to its inner wall, and the filter element (14) is disposed between the two retaining rings (19).

8. The threaded external breather valve according to claim 1, characterized in that: The valve core assembly includes a positive pressure valve disc (20), a negative pressure valve disc (21), a positive pressure spring (22), a negative pressure spring (23), and a valve stem (24). The positive pressure valve disc (20) abuts against the end of the valve body (1), and the negative pressure valve disc (21) abuts against the end face of the positive pressure valve disc (20) near the valve body (1). The positive pressure valve disc (20) has a connecting hole (25) along the axial direction, and a gap is formed between the negative pressure valve disc (21) and the valve body (1). 26), the positive pressure spring (22) is installed between the valve cover (2) and the positive pressure valve disc (20), the valve stem (24) passes through the positive pressure valve disc (20) and connects to the negative pressure valve disc (21), and the valve stem (24) is provided with a plug (27) at one end away from the negative pressure valve disc (21), the negative pressure spring (23) is sleeved on the outside of the valve stem (24), and one end of the negative pressure spring (23) abuts against the plug (27) and the other end abuts against the positive pressure valve disc (20).

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