Air premixing mechanism and silane reactor comprising same

Abstract

The present application relates to the technical fields of silane environmental protection treatment, in particular to an air premixing mechanism and a silane reactor containing the same, which comprises a movable sealing assembly and a fixed sealing assembly, the movable sealing assembly is slidably arranged in the housing and has a first channel for gas passing through, and the fixed sealing assembly is fixedly arranged in the housing and has a second channel for gas passing through. The present application can quickly push the movable sealing assembly and the fixed sealing assembly to form a seal and block backfire when deflagration occurs. Meanwhile, the air permeation opening is automatically staggered to increase the amplitude after each deflagration, the silane gas flux is gradually decreased, and the intensity of subsequent deflagration is reduced.

Description

Technical Field

[0001] This invention relates to the field of silane environmental protection treatment technology, specifically to an air premixing mechanism and a silane reactor containing the mechanism. Background Technology

[0002] In silane reactors, silane gas typically needs to be premixed with air (or other oxidizing gases) for subsequent reaction or combustion processes. For this purpose, an air mixing mechanism is installed at the front end of the reactor, through which silane gas is piped from the generator. However, the premixed gas formed by silane and air is prone to deflagration under certain conditions (such as localized overheating, electrostatic discharge, or catalytic action). The shock wave and high-temperature flame generated by the deflagration propagate backward along the pipes, resulting in a phenomenon known as "backfire."

[0003] Backfire can damage upstream silane gas generating equipment and potentially lead to more serious safety incidents. Existing backfire prevention measures typically include installing flame arresters or check valves in the pipeline. Flame arresters rely on their fine pores to absorb heat and extinguish the flame, but they are prone to clogging with prolonged use and do not respond quickly enough to high-speed deflagration impacts. While check valves can prevent gas backflow, their seals may fail due to high temperatures or impacts under deflagration impacts, and they cannot cope with repeated deflagration events.

[0004] Furthermore, if the silane gas supply remains constant after multiple deflagrations, the deflagration intensity within the mixing mechanism may increase progressively, creating a vicious cycle. Current technology lacks a mechanism that can both rapidly prevent deflagration and backfire and automatically and gradually reduce the silane gas flow rate after each deflagration, thereby reducing the risk of subsequent deflagrations. Summary of the Invention

[0005] In order to overcome the above-mentioned technical problems, the present invention aims to provide an air premixing mechanism and a silane reactor containing the mechanism to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An air premixing mechanism includes: a housing; a movable sealing assembly slidably disposed within the housing and having a first channel for gas passage; and a fixed sealing assembly fixedly disposed within the housing and having a second channel for gas passage; wherein the movable sealing assembly can slide toward the fixed sealing assembly and form a seal with the fixed sealing assembly when subjected to a reverse gas impact, and simultaneously drive an adjusting element within the fixed sealing assembly to change the effective ventilation area of ​​the second channel.

[0007] Preferably, the movable sealing assembly includes a cylinder, a guide nozzle disposed at the bottom of the cylinder, a moving coil disposed at the top of the cylinder, and a receiving member connected to the bottom of the moving coil, wherein the moving coil is provided with a venting groove for the first channel.

[0008] Preferably, the guide nozzle is used to gather and guide the reverse gas upwards, and the bottom of the impacted component is arc-shaped.

[0009] Preferably, the sealing assembly includes a sealing member, a spline shaft slidably disposed in the sealing member, a spring sleeved on the spline shaft, a movable sealing member rotatably connected to the spline shaft, and a thrust ring abutting against the movable sealing member; the bottom of the sealing member is provided with a protruding plug corresponding to the venting groove, and the sealing member is provided with a venting port of the second channel at a position offset from the protruding plug.

[0010] Preferably, the spline shaft can only move axially relative to the fixed seal and cannot rotate; the fixed seal is provided with a gear ring for restricting the rotation of the movable seal; the crank spring is connected between the spline shaft and the movable seal and has the tendency to drive the movable seal to rotate.

[0011] Preferably, an elastic element is provided between the thrust ring and the housing to provide damping for the movable seal.

[0012] Preferably, when the movable sealing component slides toward the fixed sealing component, the impact member can contact and push the spline shaft to move axially, causing the movable sealing component to disengage from the gear ring, thereby causing the crank spring to drive the movable sealing component to rotate.

[0013] Preferably, when the movable sealing component slides to the end position towards the fixed sealing component, the protruding plug of the fixed sealing component is inserted into the vent groove of the moving coil component to form the seal.

[0014] Preferably, after the reverse gas impact ends, the movable sealing component slides back to its original position under its own gravity, causing the venting slot of the moving coil to reopen.

[0015] Preferably, after the movable seal is pushed and rotated each time, its relative position to the vent of the fixed seal is offset, thereby changing the effective ventilation area of ​​the second channel.

[0016] Preferably, the housing includes an upper housing assembly and a lower housing, the upper housing assembly and the lower housing are connected by threads, and the upper housing assembly is provided with an upper plate.

[0017] A silane reactor comprising an air premixing mechanism as described above.

[0018] Compared with the prior art, the beneficial effects of the present invention are: When the explosive gas flows back into the lower shell, the guide nozzle gathers the explosive gas and impacts the arc-shaped surface of the impacted part upward. The impact force pushes the movable sealing assembly to slide upward quickly, so that the protruding plug at the bottom of the fixed sealing part is inserted into the vent groove of the moving coil part, forming a mechanical hard seal. This process does not require external control signals, has a fast response speed, and can effectively prevent the explosive gas and flame from spreading upstream. Each time the deflagration causes the movable seal assembly to rise, the impacted component pushes the spline shaft and the movable seal assembly upward, causing the movable seal assembly to temporarily disengage from the gear ring limit and rotate slightly under the drive of the crank spring component. After resetting, the vent of the movable seal assembly and the fixed seal assembly are slightly misaligned, thereby reducing the effective ventilation area of ​​the fixed seal assembly. After multiple deflagrations, the misalignment of the vents gradually increases, and the amount of silane gas passing through gradually decreases. This helps to reduce the intensity of subsequent deflagrations, avoid a vicious cycle, and improve the safety of the system's long-term operation. The entire mechanism uses the impact force of the explosive gas itself as the driving source to achieve the sealing action and flow regulation action. Resetting relies on the gravity of the movable sealing component, eliminating the need for external power and control components such as solenoid valves, motors or sensors, thus reducing manufacturing costs and failure rate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional cross-section of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the structure at point A; Figure 4 This is a schematic diagram of the structure of the fixed sealing component and the movable sealing component of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the structure of the fixed sealing component and the movable sealing component of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the structure of the active sealing component of the present invention; Figure 7 This is a schematic diagram of the overall explosion structure of the present invention.

[0020] In the diagram: 11. Upper shell assembly; 111. Upper shell; 112. Upper plate; 12. Lower shell; 13. Movable seal assembly; 131. Movable cylinder; 132. Guide nozzle; 133. Impacted component; 134. Moving coil component; 14. Fixed seal assembly; 144. Fixed seal component; 145. Splined shaft; 146. Crank spring component; 147. Movable seal component; 148. Thrust ring. Detailed Implementation

[0021] The technical solutions of the embodiments 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] One embodiment provided by the present invention: refer to Figures 1-7 An air premixing mechanism and a silane reactor containing the mechanism, wherein the air premixing mechanism comprises: Upper shell assembly 11, lower shell 12, movable sealing assembly 13 and fixed sealing assembly 14.

[0023] The upper shell assembly 11 and the lower shell 12 constitute the housing of this device. The upper shell assembly 11 includes an upper shell 111 and an upper plate 112, and the upper plate 112 is connected inside the upper shell 111.

[0024] The lower housing 12 and the upper housing 111 are connected by threads.

[0025] The top of the upper shell 111 and the bottom of the lower shell 12 are both connected to external silane pipes via flanges. The pipe connected to the bottom of the lower shell 12 is connected to the air mixing mechanism of the silane reactor, and the pipe connected to the top of the upper shell assembly 11 is connected to the silane gas generating device.

[0026] refer to Figure 2 and Figure 3 As shown, a movable sealing assembly 13 is slidably connected to the lower housing 12 via a sliding groove. The movable sealing assembly 13 can slide axially within the sliding groove of the lower housing 12. The movable sealing assembly 13 includes a movable cylinder 131, and a guide nozzle 132 is provided at the bottom of the movable cylinder 131.

[0027] The top of the movable cylinder 131 is connected to a moving coil 134 by a thread, and the moving coil 134 is provided with a venting groove.

[0028] The receiving component 133 is connected to the bottom of the moving coil component 134. The bottom of the receiving component 133 is arc-shaped. The guide nozzle 132 is used to gather and guide the explosive gas from below upwards. The guided explosive gas impacts the arc-shaped surface of the receiving component 133. Then, the explosive gas passes through the gap between the outer extension of the receiving component 133 and the inner wall of the movable cylinder 131, and then upwards through the venting slot in the moving coil component 134. When explosive gas is generated, the impact of the explosion flows back from the mixer through the pipe to the lower housing 12. The guide nozzle 132 at the bottom of the movable sealing component 13 in the lower housing 12 gathers and guides the explosive gas, causing it to impact the arc-shaped surface of the receiving component 133. This pushes the movable sealing component 13 to move upwards along the axial direction of the lower housing 12, causing the fixed sealing component 144 in the fixed sealing component 14 to block the venting slot of the moving coil component 134, thus preventing the explosive gas from passing through the device.

[0029] The sealing assembly 14 includes a sealing member 144. The bottom of the sealing member 144 is provided with a protruding plug corresponding to the vent groove of the moving coil member 134. The sealing member 144 is provided with a vent at a position offset from the protruding plug. A spline shaft 145 is slidably connected to the central axis of the sealing member 144. The spline shaft 145 can only move along the axial direction of the sealing member 144 and cannot rotate.

[0030] A movable seal 147 is rotatably connected to the spline shaft 145. The movable seal 147 corresponds to the vent on the fixed seal 144. A spring 146 is provided on the spline shaft 145. The spring 146 is connected between the spline shaft 145 and the movable seal 147. A toothed ring is provided on the fixed seal 144 corresponding to the movable seal 147. The movable seal 147 is limited by the toothed ring of the fixed seal 144 and cannot be driven to rotate by the spring 146.

[0031] A thrust ring 148 is slidably contacted on the movable seal 147, and a spring is connected between the thrust ring 148 and the upper plate 112.

[0032] When the movable sealing assembly 13 is impacted by the blast gas and moves axially upward, the protruding plug of the fixed sealing member 144 inserts into the vent groove of the moving coil member 134, thus forming an effective seal. As the movable sealing assembly 13 rises, just before reaching its final position, the impacted member 133 contacts the bottom of the spline shaft 145. As the movable sealing assembly 13 continues to rise, it pushes the spline shaft 145, the crank spring member 146, and the movable sealing member 147 upward. At this time, the thrust ring 148 contracts. When the movable sealing assembly 13 reaches its highest end position, the pushed movable sealing member 147 disengages from the gear ring of the fixed sealing member 144. The crank spring member 146 then drives the movable sealing member 147 to rotate around its axis. Under the damping effect of the thrust ring 148, the rotation amplitude of the movable sealing member 147 is relatively small.

[0033] Once the sealing is complete and the deflagration has ended, the movable sealing component 13 will fall back to its pre-deflagration position under its own weight. After returning to its original position, the vent slot of the moving coil component 134 will reopen, thereby ensuring the continued discharge of silane gas.

[0034] When the movable seal 147 is lifted once, since it is not limited by the toothed ring, the spring 146 will drive the movable seal 147 to rotate to a certain extent, which will cause the vent on the fixed seal 144 and the movable seal 147 to be slightly misaligned, reducing the amount of silane gas that can pass through the fixed seal assembly 14.

[0035] During each deflagration that causes the active sealing component 13 to be blocked, the vents of the fixed sealing component 144 and the active sealing component 147 can be continuously staggered. Each deflagration will cause the vents to open wider, thereby reducing the amount of silane gas passing through.

[0036] Working principle: During operation, silane gas enters through a pipe connected to the top of the upper shell assembly 11, passes sequentially through the upper plate 112, the fixed sealing assembly 14, and the movable sealing assembly 13, and finally enters the air mixing mechanism of the silane reactor through a pipe connected to the bottom of the lower shell 12. Under normal ventilation conditions, the movable sealing assembly 13 is initially positioned low within the lower shell 12 under its own weight, the vent of the moving coil 134 remains open, the fixed sealing element 144 in the fixed sealing assembly 14 is disengaged from the moving coil 134, and the movable sealing element 147 is kept at a fixed angle by the limiting force of the spring 146 and the toothed ring of the fixed sealing element 144, allowing the silane gas to pass through smoothly.

[0037] When deflagration occurs in the air mixing mechanism of the silane reactor, the deflagration gases will flow back into the lower shell 12 through the pipe. The backflowing deflagration gases are first gathered and guided upward by the guide nozzle 132 at the bottom of the movable sealing assembly 13, and then concentrated to impact the arc-shaped surface of the impact-receiving member 133. The impact force pushes the movable sealing assembly 13 to slide upward along the groove inside the lower shell 12.

[0038] As the movable sealing assembly 13 rises, the protruding plug at the bottom of the fixed sealing element 144 in the fixed sealing assembly 14 gradually inserts into the vent groove of the moving coil 134, forming an effective seal and preventing the explosive gas from continuing to flow upward through the device. When the movable sealing assembly 13 approaches its highest position, the impact element 133 contacts the bottom of the spline shaft 145 and continues to push the spline shaft 145, the crank spring 146, and the movable sealing element 147 upward together. At this time, the thrust ring 148 is compressed and stores force. When the movable sealing assembly 13 reaches its highest end position, the movable sealing element 147 disengages from the gear ring limit of the fixed sealing element 144, and the crank spring 146 then drives the movable sealing element 147 to rotate around the axis to a certain extent. Under the damping action of the thrust ring 148, this rotation amplitude is small and stable.

[0039] After the deflagration impact ends, the movable sealing component 13 falls back to its initial low position under its own gravity, and the vent of the moving coil 134 reopens, allowing silane gas to flow again. However, because the movable sealing component 147 was rotated by a small angle during the previous lifting process, the vent on the fixed sealing component 144 and the movable sealing component 147 is slightly misaligned, thereby reducing the amount of silane gas that can pass through the fixed sealing component 14.

[0040] When another deflagration occurs, the above process repeats: the movable sealing component 13 rises again to seal, while the splined shaft 145 is pushed again, and the movable sealing element 147 disengages from the gear ring and rotates further under the action of the crank spring 146. Each deflagration further increases the misalignment between the vent of the movable sealing element 147 and the fixed sealing element 144, thereby gradually reducing the amount of silane gas allowed to pass through, achieving self-regulation and safety control of the gas supply in the reactor.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An air premixing mechanism, characterized in that, include: case; The movable sealing component is slidably disposed within the housing and has a first channel for gas to pass through; The sealing assembly is fixedly installed inside the housing and has a second channel for gas to pass through; When subjected to reverse gas impact, the movable sealing component can slide toward the fixed sealing component and form a seal with the fixed sealing component, while driving the adjusting component inside the fixed sealing component to change the effective ventilation area of ​​the second channel.

2. The air premixing mechanism according to claim 1, characterized in that: The movable sealing assembly includes a cylinder, a guide nozzle disposed at the bottom of the cylinder, a moving coil disposed at the top of the cylinder, and a receiving component connected to the bottom of the moving coil. The moving coil is provided with a venting groove for the first channel.

3. An air premixing mechanism according to claim 2, characterized in that: The guide nozzle is used to gather and guide the reverse gas upwards, and the bottom of the impacted component is arc-shaped.

4. An air premixing mechanism according to claim 2, characterized in that: The sealing assembly includes a sealing element, a splined shaft slidably disposed in the sealing element, a spring sleeved on the splined shaft, a movable sealing element rotatably connected to the splined shaft, and a thrust ring abutting against the movable sealing element; the bottom of the sealing element is provided with a protruding plug corresponding to the venting groove, and the sealing element is provided with a venting port of the second channel at a position offset from the protruding plug.

5. An air premixing mechanism according to claim 4, characterized in that: The spline shaft can only move axially relative to the fixed seal and cannot rotate; the fixed seal is provided with a gear ring for restricting the rotation of the movable seal; the spring is connected between the spline shaft and the movable seal and has the tendency to drive the movable seal to rotate.

6. An air premixing mechanism according to claim 5, characterized in that: An elastic element is provided between the thrust ring and the housing to provide damping for the movable seal.

7. An air premixing mechanism according to claim 4, characterized in that: When the movable sealing component slides toward the fixed sealing component, the impact member can contact and push the spline shaft to move axially, causing the movable sealing component to disengage from the gear ring, thereby causing the crank spring to drive the movable sealing component to rotate.

8. An air premixing mechanism according to claim 2, characterized in that: When the movable sealing component slides to the end position towards the fixed sealing component, the protruding plug of the fixed sealing component is inserted into the vent groove of the moving coil component to form the seal.

9. An air premixing mechanism according to claim 2, characterized in that: After the reverse gas impact ends, the active sealing component slides back to its original position under its own gravity, causing the venting slot of the moving coil component to reopen.

10. An air premixing mechanism according to claim 7, characterized in that: Each time the movable seal is pushed and rotated, its relative position to the vent of the fixed seal is misaligned, thereby changing the effective ventilation area of ​​the second channel.

11. An air premixing mechanism according to claim 1, characterized in that: The housing includes an upper housing assembly and a lower housing, which are connected by threads. The upper housing assembly contains an upper plate.

12. A silane reactor, characterized in that, It includes an air premixing mechanism as described in any one of claims 1 to 11.

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