High pressure construction fire damper breather valve

Abstract

The application discloses a high-pressure structure fire-resistant breathing valve, which comprises a valve body, an exhalation channel and an inhalation channel are arranged in the valve body respectively, the exhalation channel and the inhalation channel are arranged independently, the exhalation channel and the inhalation channel are respectively provided with opening and closing valve assemblies, and the exhalation channel and the inhalation channel are respectively provided with an exhalation fire-resistant core and an inhalation fire-resistant core on the atmospheric side. The independent channel and the gradient fire-resistant structure design improve the adaptability of the breathing valve to high-pressure working conditions, reduce the influence of the fire-resistant structure blockage on the inhalation channel, and have the characteristics of reasonable structure, high safety and convenient maintenance.

Description

Technical Field

[0001] This utility model relates to a high-pressure structure flame-arresting breather valve, belonging to the field of valves. Background Technology

[0002] A breather valve is a safety protection device installed on storage tanks or pressure vessels to automatically release or draw in gas when the internal pressure of the container changes, thereby maintaining pressure balance inside and outside the container. In petrochemical, storage and transportation equipment, and related industrial scenarios, breather valves are often used in conjunction with flame arresters to prevent external flames from entering the container through the gas passage, thus improving system safety.

[0003] In existing technologies, the breathing valve and flame arrestor structure are mostly designed as an integrated unit or in series. The flame arrestor core is usually located in the middle of the airflow channel or near the medium side, and its structure is mostly single-layer or homogeneous. In practical applications, due to limited structural space and the large flow resistance of the flame arrestor structure, the exhalation pressure can generally only reach a low level, usually in the thousands of Pascals, which is difficult to meet the requirements of high-pressure exhalation conditions. At the same time, when impurities are entrained in the gas, the flame arrestor structure is prone to blockage, and when the positive and negative pressure channels share the flame arrestor structure, it can easily lead to obstruction of the inhalation channel, resulting in excessive negative pressure in the container. Therefore, it is urgent to improve the existing technology to solve the problems of insufficient high-pressure adaptability and low reliability of the flame arrestor structure. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a high-pressure structure flame arrestor breather valve.

[0005] A high-pressure flame-arresting breathing valve includes a valve body, in which an exhalation channel and an inhalation channel are respectively provided, and the exhalation channel and the inhalation channel are independently provided; the exhalation channel and the inhalation channel are respectively provided with an on / off valve assembly; and an exhalation flame-arresting core and an inhalation flame-arresting core are respectively provided on the atmospheric side of the exhalation channel and the inhalation channel.

[0006] Furthermore, the exhalation flame arrestor and the inhalation flame arrestor are detachably mounted on the valve body via threaded connection, snap-fit ​​connection, or interference fit connection.

[0007] Furthermore, the exhalation flame arrestor core is provided with a multi-layer gradient flame arrestor structure on the upstream side along the airflow direction. The multi-layer gradient flame arrestor structure includes at least two layers of flame arrestor units arranged sequentially along the airflow direction. Each flame arrestor unit is provided with a guide hole, and the diameter of the guide hole of each flame arrestor unit is gradually decreasing.

[0008] Furthermore, the cross-section of the guide hole on each of the flame arrestor units is a funnel-shaped structure that varies from large to small along the airflow direction.

[0009] Furthermore, the fire-arresting units of the multi-layer gradient fire-arresting structure exhibit a gradient change in material heat capacity, and different fire-arresting units use different metal materials or sintered materials with different densities.

[0010] Furthermore, a buffer cavity is provided between adjacent fire-arresting units in the multi-layer gradient fire-arresting structure.

[0011] Furthermore, the multi-layer gradient fire-resistant structure also includes at least one pre-filter layer disposed on the upstream side of the fire-resistant unit.

[0012] Furthermore, the flame arrestor unit is provided with a flame arrestor elastic ring on its outer periphery for sealing with the valve body.

[0013] Furthermore, the aperture of the guide hole of the flame arresting unit closest to the exhalation flame arresting core in the multi-layer gradient flame arresting structure matches the channel aperture of the exhalation flame arresting core.

[0014] Furthermore, the exhalation flame arrestor core is equipped with a bird net and a rain cap on the outside.

[0015] This invention offers significant advantages: by independently setting up the exhalation and inhalation channels and configuring independent flame-arresting cores for each, and introducing a multi-layered gradient flame-arresting structure on the exhalation side, the overall device's adaptability to high-pressure conditions is improved while ensuring flame-arresting safety. Compared to existing technologies, this structure gradually reduces the airflow impact intensity during exhalation through gradient-changing guide holes and achieves rapid heat absorption by combining materials with different heat capacities, causing the flame to gradually attenuate during propagation, thereby enhancing the flame-arresting effect. Simultaneously, the independently set inhalation flame-arresting core avoids the impact of exhalation-side blockage on the inhalation process, reducing the risk of excessive negative pressure in the container. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the overall structure of a high-pressure flame arrestor breather valve according to this utility model.

[0018] Figure 2 for Figure 1 A magnified view of the details at point A in the middle.

[0019] In the diagram, 1 is the valve body; 11 is the exhalation channel; 12 is the inhalation channel; 2 is the opening and closing valve assembly; 21 is the exhalation valve assembly; 22 is the inhalation valve assembly; 3 is the exhalation flame arrestor core; 4 is the inhalation flame arrestor core; 5 is the multi-layer gradient flame arrestor structure; 51 is the flame arrestor unit; 52 is the guide hole; 53 is the buffer chamber; 54 is the pre-filter layer; 55 is the flame arrestor elastic ring; 6 is the bird net; and 7 is the rain cap. 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] Based on this, and to improve the problems in related technologies, embodiments of this application provide a high-pressure structural flame arrestor breather valve, such as... Figures 1 to 2 As shown: The system includes a valve body 1, within which are independently configured an exhalation channel 11 and an inhalation channel 12 to avoid airflow interference. Each of the exhalation and inhalation channels 11 and 12 contains an on / off valve assembly 2, comprising an exhalation valve assembly 21 and an inhalation valve assembly 22. The exhalation valve assembly 21 controls positive pressure exhaust, while the inhalation valve assembly 22 controls negative pressure intake. Exhalation flame arresters 3 and inhalation flame arresters 4 are respectively installed on the atmospheric side of the exhalation and inhalation channels 11 and 12, thus forming independent flame arresting paths.

[0024] During operation, when the internal pressure of the container increases, the exhalation valve assembly 21 opens, and gas flows through the exhalation channel 11 to the exhalation flame arrestor 3; when the internal pressure of the container decreases, the inhalation valve assembly 22 opens, and outside gas enters the container through the inhalation flame arrestor 4, thereby achieving pressure balance. Because the flame arrestor is located on the atmospheric side, it avoids direct contact with the medium, reducing the risk of corrosion and blockage. It does not affect the inhalation-side flame arrestor, avoids excessive vacuum in the canister, and better meets conventional requirements. Generally, the exhalation pressure requirement is several kilopascals or even tens of kilopascals, while the inhalation pressure requirement is generally several hundred kilopascals, resulting in a wider pressure range.

[0025] Optionally, in some embodiments, the exhalation flame arrestor core 3 and the inhalation flame arrestor core 4 are detachably mounted on the valve body 1 via threaded connection, snap-fit ​​connection, or interference fit connection. This structure allows the flame arrestor cores to be disassembled and maintained individually, and in practical applications, quick replacement can be achieved by rotating the connecting sleeve or setting a limiting groove. As an alternative embodiment, those skilled in the art can also use a flange clamping structure for fixation. This method can reduce disassembly and assembly steps and improve maintenance efficiency during equipment maintenance. In the threaded connection, the outer wall of the flame arrestor core is machined with threads that engage with the corresponding internal threads of the valve body; the snap-fit ​​connection achieves quick locking through the engagement of elastic claws and grooves; the interference fit relies on dimensional tolerances for tightening. During disassembly, the flame arrestor core can be removed simply by rotating or pulling, facilitating individual cleaning of accumulated dust or replacement of damaged parts without disassembling the entire valve body.

[0026] Optionally, in some embodiments, the exhalation flame arrestor core 3 has a multi-layer gradient flame arrestor structure 5 on its upstream side along the airflow direction. This structure includes multiple sequentially arranged flame arrestor units 51, each with a guide hole 52, the diameter of which gradually decreases. After the airflow enters, it is initially dispersed through the large-diameter region and then gradually enters the small-diameter region, thereby achieving airflow deceleration and flame suppression. As an alternative embodiment, a gradient structure can be formed by stacking porous sintered plates. This structure can reduce local impact and improve flame arrestor stability under high-pressure airflow conditions.

[0027] Optionally, in some embodiments, the guide hole 52 has a trumpet-shaped structure, which gradually contracts during the airflow entry process to buffer it, allowing the airflow to enter smoothly and accelerate at the exit, generating local compression, which helps to disrupt the continuity of the flame front. This structure can be formed by stamping or precision machining to further optimize the airflow distribution.

[0028] Optionally, in some embodiments, each flame-arresting unit 51 uses materials with different heat capacities, such as a combination of stainless steel and copper alloy, so that the gas gradually absorbs heat and cools down during flow, thereby enhancing the flame-arresting effect. The upstream flame-arresting unit uses a material with lower heat capacity to quickly absorb initial heat, while the downstream unit uses a material with higher heat capacity to continuously dissipate heat. The different densities of the sintered materials achieve a heat conduction gradient by adjusting the porosity. This gradient matching ensures that the heat distribution is uniform under the impact of high-pressure flames, avoiding local overheating that could lead to structural deformation.

[0029] Optionally, in some embodiments, a buffer cavity 53 is provided between adjacent flame arrestor units 51 to slow down the airflow speed and disperse pressure fluctuations, thereby reducing the impact on subsequent structures.

[0030] Optionally, in some embodiments, a pre-filter layer 54 is provided at the front end of the multi-layer gradient flame arrestor structure 5. This filter layer may be a metal wire mesh or a porous filter plate, used to intercept particulate impurities.

[0031] Optionally, in some embodiments, a flame-arresting elastic ring 55 is provided on the outer periphery of the flame-arresting unit 51 to achieve a sealed connection and prevent gas bypass.

[0032] Optionally, in some embodiments, the guide hole of the flame arrestor unit closest to the exhalation flame arrestor core 3 is matched with the aperture of the flame arrestor core channel, so that the airflow transition is smoother.

[0033] Optionally, in some embodiments, the exhalation flame arrestor core 3 is provided with a bird net 6 and a rain cap 7 to prevent external birds and rainwater from eroding the flame arrestor core, thereby increasing its service life and effectiveness.

[0034] The overall working principle is as follows: when gas is exhaled from the exhalation channel, it passes through the filter layer, the gradient flame arrestor unit and the flame arrestor core in sequence, and flame arrest is achieved through the gradual deceleration and cooling effect; when inhaled, it enters through an independent flame arrestor path, thereby avoiding mutual interference.

[0035] 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.

[0036] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A high-pressure flame arrestor breather valve, characterized in that: The valve body includes an exhalation channel and an inhalation channel, which are independently configured. The exhalation channel and the inhalation channel are each equipped with an on / off valve assembly; The exhalation channel and the inhalation channel are respectively equipped with an exhalation flame arrestor and an inhalation flame arrestor on the atmospheric side.

2. The high-pressure structural flame arrestor breather valve as described in claim 1, characterized in that: The exhalation flame arrestor and the inhalation flame arrestor can be detachably installed on the valve body via threaded connection, snap-fit ​​connection or interference fit connection.

3. The high-pressure structural flame arrestor breather valve as described in claim 1 or 2, characterized in that: The exhalation flame arrestor core has a multi-layer gradient flame arrestor structure on the upstream side along the airflow direction. The multi-layer gradient flame arrestor structure includes at least two layers of flame arrestor units arranged sequentially along the airflow direction. Each flame arrestor unit has a guide hole, and the diameter of the guide hole of each flame arrestor unit varies in a gradually decreasing gradient.

4. The high-pressure structural flame arrestor breather valve as described in claim 3, characterized in that: The cross-section of the guide hole on each of the flame arrestor units is a funnel-shaped structure that varies from large to small along the airflow direction.

5. The high-pressure structural flame arrestor breather valve as described in claim 3, characterized in that: The fire-arresting units of the multi-layer gradient fire-arresting structure exhibit a gradient change in material heat capacity, and different fire-arresting units use different metal materials or sintered materials with different densities.

6. The high-pressure structural flame arrestor breather valve as described in claim 3, characterized in that: In the multi-layer gradient fire-resistant structure, a buffer cavity is provided between adjacent fire-resistant units.

7. The high-pressure structural flame arrestor breather valve as described in claim 3, characterized in that: The multi-layer gradient fire-resistant structure also includes at least one pre-filter layer disposed on the upstream side of the fire-resistant unit.

8. The high-pressure structural flame arrestor breather valve as described in claim 7, characterized in that: The flame arrestor unit is provided with a flame arrestor elastic ring on its outer periphery for sealing with the valve body.

9. The high-pressure structural flame arrestor breather valve as described in claim 3, characterized in that: The aperture of the guide hole of the flame arresting unit closest to the exhalation flame arresting core in the multi-layer gradient flame arresting structure matches the channel aperture of the exhalation flame arresting core.

10. The high-pressure structural flame arrestor breather valve as described in claim 1, characterized in that: The exhalation flame arrestor core is equipped with a bird-proof net and a rainproof cap.

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