Gas safety valve

Abstract

This invention belongs to the field of valve technology and discloses a gas safety valve, including a valve body, a valve core assembly, a flow sensor, a first rectifier, a second rectifier, and a filter screen. The valve body has an inlet channel, an outlet channel, and a valve cavity. A portion of the valve core assembly is movably disposed within the valve cavity. The valve core assembly is configured to open or close the fluid passage between the inlet and outlet channels. The flow sensor is disposed within the outlet channel. The first rectifier, the second rectifier, and the filter screen are sequentially disposed within the channels of the valve body along the direction of medium flow, and are all located upstream of the flow sensor. The gas safety valve provided by this invention can perform two-stage rectification of the gas medium and filter impurities, improving the fluid state flowing into the flow sensor, avoiding flow detection accuracy errors caused by turbulent flow and impurity accumulation, reducing the probability of misidentification of operating conditions by the main control unit, and improving the operational reliability and user experience of the gas safety valve.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more particularly to a gas safety valve. Background Technology

[0002] A gas safety valve is a device used to cut off, connect, and regulate gas in pipelines to ensure gas safety. Gas enters the gas safety valve from four directions (top, bottom, left, and right) through the right-angle bend at the inlet, creating high-intensity eddies and asymmetrical turbulence. First, significant flow velocity fluctuations cause serious deviations in the flow sensor's measurement accuracy. Second, oil and solid impurities carried in the gas easily accumulate in the sensitive area of ​​the flow sensor's chip, clogging the sensor's flow path over time and continuously reducing flow detection accuracy. Furthermore, the flow sampling noise caused by turbulence significantly interferes with the valve's main control AI algorithm's identification of leaks and overflow conditions. Normal gas fluctuations are easily misinterpreted as malfunctions, frequently resulting in accidental gas supply cutoffs and a poor user experience.

[0003] Therefore, there is an urgent need to provide a gas safety valve to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a gas safety valve that can perform secondary rectification of the gas medium and filter impurities, improve the fluid state flowing into the flow sensor, avoid the flow detection accuracy deviation caused by eddy currents and turbulence and impurity accumulation, reduce the probability of the main control unit misidentifying the operating condition, and improve the working reliability of the gas safety valve and the user experience.

[0005] To achieve this objective, the present invention adopts the following technical solution: A gas safety valve, comprising: The valve body is provided with an air inlet channel, an air outlet channel, and a valve cavity connecting the air inlet channel and the air outlet channel; A valve core assembly, a portion of which is movably disposed within the valve cavity, is configured to open or close the fluid passage between the inlet passage and the outlet passage. A flow sensor is installed inside the air outlet channel; The first rectifier, the second rectifier, and the filter screen are sequentially arranged in the channel of the valve body along the direction of medium flow, and are all located upstream of the flow sensor.

[0006] As an optional solution, the first rectifier and the second rectifier are sequentially arranged in the air inlet channel along the flow direction of the medium, and the filter screen is arranged at the inlet end of the air outlet channel.

[0007] As an optional solution, a sleeve is also included, which is detachably connected to the air intake channel. Along the direction of medium flow, the first rectifier and the second rectifier are sequentially fixed inside the sleeve at intervals.

[0008] As an optional solution, the first rectifier is a fan-blade rectifier, which includes a central hub, an outer ring body, and a plurality of guide fan blades. The outer ring body is disposed around the outer periphery of the central hub, and the plurality of guide fan blades are evenly spaced along the circumference of the central hub. The inner end of the guide fan blade is connected to the central hub, and the outer end of the guide fan blade is connected to the outer ring body. A flow gap is formed between two adjacent guide fan blades.

[0009] As an alternative, the guide fan blade is a torsion surface blade.

[0010] As an alternative, the second rectifier is a plate rectifier, which includes a plate and a plurality of through-holes formed on the plate.

[0011] As an alternative, the flow guide hole is constructed as a fan-shaped annular hole extending circumferentially along the plate.

[0012] As an alternative, the filter screen is a thin plate structure with several through-holes.

[0013] As an alternative, the filter screen is made of stainless steel.

[0014] As an optional solution, the valve core assembly is a ball valve assembly, which includes: A ball valve core, which is rotatably disposed within the valve cavity, and is used to open or close the fluid passage between the air inlet passage and the air outlet passage; A valve stem, one end of which is connected to the ball valve core, and the other end of which extends outside the valve body; A drive component is connected to one end of the valve stem that extends out of the valve body and is used to drive the valve stem to rotate the ball valve core.

[0015] The beneficial effects of this invention are: This invention provides a gas safety valve. A first rectifier, a second rectifier, and a filter are sequentially arranged upstream of the flow sensor along the direction of medium flow. Gas flows through these components before passing through the flow sensor. The two-stage rectification structure effectively eliminates the high-intensity eddies and asymmetrical turbulence generated by the right-angle bend at the inlet, stabilizing the airflow velocity and improving fluid conditions passing through the flow sensor. This prevents significant velocity fluctuations that could cause serious deviations in the flow sensor's measurement accuracy. The filter intercepts oil and solid impurities in the gas, preventing their accumulation in the sensitive area of ​​the flow sensor's chip and maintaining its long-term detection accuracy. Simultaneously, flow sampling noise caused by turbulent flow is suppressed, reducing the probability of misidentification of operating conditions by the main control unit and improving the gas safety valve's reliability and user experience. Attached Figure Description

[0016] Figure 1 This is an isometric sectional view of the gas safety valve provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the air inlet end of the first rectifier provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the air outlet end of the first rectifier provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the second rectifier provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the filter screen provided in an embodiment of the present invention.

[0017] In the picture: 1. Valve body; 11. Valve chamber; 12. Inlet passage; 13. Outlet passage; 2. Valve core assembly; 21. Ball valve core; 211. Through hole; 22. Drive component; 3. Flow sensor; 4. First rectifier; 41. Center hub; 42. Outer ring; 43. Guide fan blades; 44. Flow clearance; 5. Second rectifier; 51. Plate; 52. Flow guide hole; 6. Filter screen; 61. Filter holes; 7. Sleeve. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 As shown, this embodiment provides a gas safety valve, including a valve body 1, a valve core assembly 2, and a flow sensor 3. The valve body 1 is provided with an inlet channel 12, an outlet channel 13, and a valve cavity 11 connecting the inlet channel 12 and the outlet channel 13. The inlet channel 12 and the outlet channel 13 are arranged coaxially. Part of the valve core assembly 2 is movably disposed in the valve cavity 11. The valve core assembly 2 is configured to open or close the fluid passage between the inlet channel 12 and the outlet channel 13. The flow sensor 3 is disposed in the outlet channel 13.

[0023] Combination Figure 1 When the gas safety valve is working normally, the valve core assembly 2 opens the fluid passage between the inlet channel 12 and the outlet channel 13. The gas medium flows in along the axial direction of the inlet channel 12 and is transported outward through the outlet channel 13. At the same time, the flow sensor 3 installed in the outlet channel 13 can collect the gas flow signal in real time and continuously, and transmit the detection signal to the main control unit of the equipment. When the main control unit identifies abnormal safety conditions such as gas leakage or overflow through the flow signal, it can control the valve core assembly 2 to quickly close the fluid passage between the inlet channel 12 and the outlet channel 13, cut off the gas supply, and achieve safety protection.

[0024] In an optional embodiment, the flow sensor 3 may employ, as shown in the example below. Figure 1The inserted sensor shown has its probe inserted into the gas outlet channel 13, directly contacting the gas medium. In another optional embodiment, the flow sensor 3 can also be a non-insertion sensor, that is, an installation channel communicating with the gas outlet channel 13 is opened on the pipe wall of the gas outlet channel 13, and the probe of the sensor is embedded in the installation channel, which can also directly contact the gas medium, but the probe does not extend into the gas outlet channel 13.

[0025] In one embodiment, such as Figure 1 As shown, the valve core assembly 2 is a ball valve assembly, which includes a ball valve core 21, a valve stem, and a drive component 22. The ball valve core 21 is rotatably disposed in the valve cavity 11 and is used to open or close the fluid passage between the inlet channel 12 and the outlet channel 13. One end of the valve stem is connected to the ball valve core 21, and the other end of the valve stem extends outside the valve body 1. The drive component 22 is connected to the end of the valve stem that extends outside the valve body 1 and is used to drive the valve stem to rotate the ball valve core 21. The ball valve core 21 has a through hole 211 for connecting the inlet channel 12 and the outlet channel 13. The valve stem can be driven to rotate by the drive component 22, and the valve stem drives the ball valve core 21 to rotate around a reference axis, so that the ball valve core 21 switches between an open state and a closed state. When the ball valve core 21 is in the open state (… Figure 1 As shown, the through hole 211 of the ball valve core 21 is completely aligned with the axes of the inlet channel 12 and the outlet channel 13 to allow the flow of the gas medium. When the through hole 211 is perpendicular to the axes of the inlet channel 12 and the outlet channel 13, the ball valve core 21 can be closed, thereby cutting off the gas medium. The ball valve assembly has a fast opening and closing speed and requires little effort to operate. It only requires a 90° rotation of the valve stem to fully open or close, which is much faster than gate valves and globe valves, making it suitable for scenarios that require rapid shut-off or connection.

[0026] It should be noted that, along the direction of medium flow, two annular valve seats (existing technology, not shown) are sequentially arranged in the valve cavity 11, respectively abutting against both sides of the ball valve core 21, thereby achieving the limiting installation of the ball valve core 21 and ensuring a certain sealing effect.

[0027] In one embodiment, the drive component 22 is a servo motor assembly, which can drive the valve stem to rotate after receiving a signal from the main control unit. Its specific structure and working principle are existing technologies and will not be described in detail here. In other embodiments, the drive component 22 can also be any other automated structure capable of driving the valve stem to rotate, and no specific limitation is made here.

[0028] Furthermore, such as Figure 1As shown, the gas safety valve also includes a first rectifier 4, a second rectifier 5, and a filter screen 6. The first rectifier 4, the second rectifier 5, and the filter screen 6 are sequentially arranged in the channel of the valve body 1 along the direction of medium flow, and are all located upstream of the flow sensor 3. In the gas safety valve provided in this embodiment, the gas flows sequentially through the first rectifier 4, the second rectifier 5, and the filter screen 6 before flowing through the flow sensor 3. When the gas flows through the first rectifier 4 and the second rectifier 5, the two-stage rectification structure can effectively eliminate the high-intensity eddies and asymmetrical turbulence generated by the right-angle bend at the inlet, stabilize the airflow velocity, improve the fluid conditions passing through the flow sensor 3, and avoid serious deviations in the metering accuracy of the flow sensor 3 caused by large fluctuations in flow velocity. The filter screen 6 can intercept oil and solid impurities in the gas, prevent impurities from accumulating in the sensitive area of ​​the chip of the flow sensor 3, and maintain the long-term detection accuracy of the flow sensor 3. At the same time, the flow sampling noise caused by the turbulent flow field is suppressed, reducing the probability of the main control unit misidentifying the operating conditions, and improving the working reliability of the gas safety valve and the user experience.

[0029] Specifically, in this embodiment, as Figure 1 As shown, the first rectifier 4 and the second rectifier 5 are sequentially arranged in the intake channel 12 along the flow direction of the medium, and the filter screen 6 is arranged at the inlet end of the outlet channel 13. The first rectifier 4 and the second rectifier 5 can sequentially perform two-stage rectification of the gas flowing into the intake channel 12, eliminating the eddies and turbulence generated by the right-angle bend at the inlet, making the gas flow field uniform and stable. The filter screen 6 is arranged at the inlet end of the outlet channel 13, downstream of the two-stage rectifiers and upstream of the flow sensor 3. The stable airflow after the two-stage rectification passes through the through hole 211 of the ball valve core 21 and then through the filter screen 6. This can avoid the impact and damage of the filter screen 6 by local high-speed airflow, and can also intercept oil and solid impurities in the gas, preventing impurities from contaminating the flow sensor 3. In another embodiment, the filter screen 6 can also be arranged at the outlet end of the intake channel 12.

[0030] In one embodiment, such as Figure 1 As shown, the gas safety valve also includes a sleeve 7, which is detachably connected to the air inlet channel 12. Along the direction of medium flow, the first rectifier 4 and the second rectifier 5 are sequentially fixed within the sleeve 7 at intervals. The sleeve 7 integrates the first rectifier 4 and the second rectifier 5 into a single integrated rectifier assembly. The sleeve 7 is detachably mounted within the air inlet channel 12. On one hand, the first rectifier 4 and the second rectifier 5 are pre-assembled within the sleeve 7; during assembly, only the entire sleeve 7 needs to be inserted into the air inlet channel 12, reducing the assembly difficulty inside the valve body 1 and improving assembly efficiency. In one embodiment, the first rectifier 4 and the second rectifier 5 can be assembled within the sleeve 7 by interference fit, threaded connection, or snap-fit ​​connection. The sleeve 7 can also be assembled within the air inlet channel 12 of the valve body 1 by interference fit, threaded connection, or snap-fit ​​connection; no specific limitations are made here.

[0031] In one embodiment, such as Figure 2 As shown, the first rectifier 4 is a fan-blade rectifier, which includes a central hub 41, an outer ring 42, and several guide fan blades 43. The outer ring 42 is arranged around the outer periphery of the central hub 41, and the several guide fan blades 43 are evenly spaced along the circumference of the central hub 41. The inner end of the guide fan blade 43 is connected to the central hub 41, and the outer end of the guide fan blade 43 is connected to the outer ring 42. A flow gap 44 is formed between two adjacent guide fan blades 43. When the gas medium flows through this fan-blade rectifier, the airflow passes through each flow gap 44. The guide fan blades 43 can guide and disperse eddies and vortices, and straighten the rotating turbulent airflow into an axially stable airflow, reducing the rotational disturbance of the fluid. The circumferentially evenly arranged guide fan blades 43 can make the airflow distribution more balanced in the circumferential direction. At the same time, the flow gaps 44 ensure smooth gas flow and reduce pressure loss.

[0032] In one embodiment, combined with Figure 2 and Figure 3 The guide vane 43 is a torsional curved surface blade. Along the flow direction of the gas medium, the guide vane 43 gradually twists and bends. When the gas medium flows over the torsional curved surface blade, the torsional surface can guide the gas vortex with rotational component and remove the swirling momentum of the airflow. This effectively dissipates the high-intensity rotating vortex generated by the right-angle bend at the entrance, gradually correcting the turbulent airflow with swirling flow into airflow flowing along the axial direction of the channel. The guiding effect of the torsional surface can also make the airflow more uniformly distributed in the circumferential range and suppress the generation of local high-speed flow clusters.

[0033] In one embodiment, such as Figure 4 As shown, the second rectifier 5 is a plate rectifier, which includes a plate 51 and several through-holes 52 formed on the plate 51. The plate 51 is circular and fits into a circular channel. Although the airflow after being processed by the torsional curved blades of the first rectifier 4 has eliminated most of the rotating vortex, there is still turbulent disturbance with uneven local flow velocity. When the gas medium flows through the plate rectifier, the several through-holes 52 play a role in diverting and constraining the airflow, further dividing and dispersing the airflow after being processed by the first rectifier 4, suppressing local flow clusters, making the flow velocity distribution of the airflow more uniform, and realizing secondary rectification. This is beneficial to improving the accuracy and stability of flow detection, reducing the sampling noise of the subsequent flow sensor 3, and reducing the main control unit's misidentification of leakage and overflow conditions.

[0034] In one embodiment, such as Figure 4As shown, the guide hole 52 is constructed as a fan-shaped annular hole extending circumferentially along the plate 51. The fan-shaped annular holes extend circumferentially and are arranged sequentially radially. Compared to circular holes, the fan-shaped annular holes can divide and guide the circumferentially distributed airflow over a larger area, better smoothing out velocity differences in the circumferential direction, uniformly distributing the airflow velocity across the cross-section, further suppressing residual turbulence, achieving a better flow field homogenization effect, and possessing greater flow capacity than circular holes, balancing rectification effect with lower pressure loss. Optionally, the radial width of the fan-shaped annular holes is 1.2 mm to 2.0 mm.

[0035] Without a rectifier structure, the relative deviation of the four-way airflow velocity at a right-angle bend is 11.4%~21.9%. After setting the first rectifier 4 and the second rectifier 5 in this embodiment, taking valve bodies 1 with two mainstream civil-use diameters of DN15 and DN20 as examples: (1) Valve body with standard DN15 nominal diameter Valve body 1 has a nominal diameter of DN15 and a rated maximum flow rate of 4m³ / h. 3 / h, working gauge pressure is 2kPa, working temperature range is -20℃~60℃; CFD simulation boundary conditions: inlet flow rate is 4m³ / h. 3 / h, with an outlet environment of 20℃ and a standard atmospheric pressure of 101.325kPa; simulating four-way air intake conditions (up, down, left, and right) at a right-angle bend, CFD simulation verified that the flow velocity at the monitoring point of the sensitive area of ​​the flow sensor 3 chip is 5.83m / s~5.88m / s, with a maximum relative deviation of 0.85%. The airflow forms a stable and symmetrical laminar flow, eliminating the metering error problem caused by the turbulence at the right-angle bend at the entrance; the steady-state pressure loss of the whole unit is 160Pa, meeting the hard requirement of valve body 1 for a pressure loss of less than or equal to 200Pa, without affecting the gas supply pressure for residential use, and without causing faults such as insufficient gas supply pressure, stove flameout, or difficulty in ignition; the actual measured offline accuracy of the whole unit is 0.02m. 3 / h~2m 3 / h low flow rate tolerance ≤ ±1.8%, 2m 3 / h~4m 3 The tolerance for high flow rates is ≤±3.2%, which meets the product design specifications and is far superior to the national standard limit.

[0036] (2) Valve body with standard DN20 diameter Valve body 1 has a nominal diameter of DN20 and a rated maximum flow rate of 6m³ / h. 3 / h, other conditions are the same as valve body 1 with DN15 standard diameter, the flow velocity at the multi-directional air inlet measuring point of the right angle elbow is 5.84m / s~5.90m / s, and the relative deviation of the flow velocity is <1%; 6m 3 The pressure loss under full flow conditions is 172Pa, which is still lower than the pressure loss limit of 200Pa, and there will be no faults such as insufficient gas supply pressure, stove flameout, or difficulty in ignition.

[0037] In one embodiment, such as Figure 5 As shown, the filter screen 6 is a thin plate structure with several through-holes 61, which are round holes. (See also...) Figure 1 The thin plate structure is compact and easy to arrange at the inlet end of the gas outlet channel 13. The filter screen 6 is close to the inlet end of the gas outlet channel 13 and can be fixed by pressing with the valve seat, occupying little axial space. The filter hole 61 can intercept oil and solid impurities in the gas, prevent impurities from contaminating the chip of the flow sensor 3 and blocking the sensor flow channel, maintain the long-term detection accuracy of the flow sensor 3, and at the same time, the filter hole 61 can also buffer small fluctuations in airflow.

[0038] In one embodiment, the filter screen 6 is made of stainless steel. Stainless steel is resistant to corrosion from water vapor and oil in the gas medium, making it less prone to rust and damage. Furthermore, the material has high strength, preventing deformation under airflow and maintaining stable filter pore size 61, thus ensuring effective impurity interception.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A gas safety valve, characterized in that, include: The valve body (1) is provided with an air inlet channel (12), an air outlet channel (13) and a valve cavity (11) connecting the air inlet channel (12) and the air outlet channel (13). Valve core assembly (2), part of which is movably disposed within the valve chamber (11), the valve core assembly (2) being configured to open or close the fluid passage between the air inlet passage (12) and the air outlet passage (13); A flow sensor (3) is installed in the air outlet channel (13); The first rectifier (4), the second rectifier (5), and the filter screen (6) are arranged sequentially in the channel of the valve body (1) along the direction of medium flow, and are all located upstream of the flow sensor (3).

2. The gas safety valve according to claim 1, characterized in that, The first rectifier (4) and the second rectifier (5) are sequentially arranged in the air inlet channel (12) along the flow direction of the medium, and the filter screen (6) is arranged at the inlet end of the air outlet channel (13).

3. The gas safety valve according to claim 2, characterized in that, It also includes a sleeve (7), which is detachably connected to the air intake channel (12). Along the direction of medium flow, the first rectifier (4) and the second rectifier (5) are fixed in the sleeve (7) at intervals.

4. The gas safety valve according to claim 1, characterized in that, The first rectifier (4) is a fan-blade rectifier, which includes a central hub (41), an outer ring (42) and a plurality of guide fan blades (43). The outer ring (42) is arranged around the outer periphery of the central hub (41). The plurality of guide fan blades (43) are evenly spaced along the circumference of the central hub (41). The inner end of the guide fan blade (43) is connected to the central hub (41), and the outer end of the guide fan blade (43) is connected to the outer ring (42). A flow gap (44) is formed between two adjacent guide fan blades (43).

5. The gas safety valve according to claim 4, characterized in that, The guide fan blade (43) is a torsion surface blade.

6. The gas safety valve according to claim 1, characterized in that, The second rectifier (5) is a plate rectifier, which includes a plate (51) and a plurality of through guide holes (52) opened on the plate (51).

7. The gas safety valve according to claim 6, characterized in that, The flow guide hole (52) is constructed as a fan-shaped annular hole extending circumferentially along the plate (51).

8. The gas safety valve according to claim 1, characterized in that, The filter screen (6) is a thin plate structure with several through-holes (61) on it.

9. The gas safety valve according to claim 8, characterized in that, The filter screen (6) is made of stainless steel.

10. The gas safety valve according to claim 1, characterized in that, The valve core assembly (2) is a ball valve assembly, which includes: Ball valve core (21), which is rotatably disposed in the valve chamber (11) and is used to open or close the fluid passage between the air inlet passage (12) and the air outlet passage (13); A valve stem, one end of which is connected to the ball valve core (21), and the other end of which extends out of the valve body (1); A drive component (22) is connected to one end of the valve stem that extends out of the valve body (1) and is used to drive the valve stem to rotate the ball valve core (21).

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