Sliding rod transmission passive pressure ultra-high alarm device

Abstract

The utility model discloses a kind of passive pressure ultrahigh alarm devices of slide bar drive, including shell, pressure sensing component, pressure regulating component and sensor component;Shell is composed of lower shell and upper shell, lower shell is equipped with pressure tapping;Pressure sensing component includes leather film, membrane disc, locating rod and compression cap, leather film is sealed between upper and lower shell, locating rod is penetrated through leather film and membrane disc and is locked by compression cap;Pressure regulating component includes adjusting column and adjusting spring, adjusting column is screwed in upper shell, spring is arranged between adjusting column and membrane disc;Sensor component includes slide bar, magnetic switch and magnet, one end magnet of slide bar is adsorbed compression cap, the other end magnet is opposite magnetic switch.Magnetic switch is passive switch, connection alarm host computer.When pressure is over limit, leather film pushes slide bar and makes magnet close to switch, triggers alarm signal, realizes passive alarm, eliminates the hidden danger of explosion-proof of active sensor, improves reliability and reduces cost.

Description

Technical Field

[0001] This utility model belongs to the field of gas transmission and distribution safety technology, and in particular relates to a slide bar driven passive high pressure alarm device. Background Technology

[0002] In the gas transmission and distribution sector, ensuring pipeline pressure remains within safe limits is crucial for preventing accidents. Currently, industrial and commercial gas users typically install gas leak alarm systems. These systems mainly consist of combustible gas detectors, alarm control panels, and solenoid valves, used to detect the concentration of gas in the air and trigger alarms and shut off the gas supply in case of leaks. However, these systems lack effective monitoring capabilities for potential risks arising from abnormally high pipeline pressures rather than leaks.

[0003] For pipeline pressure exceeding the set value, the main existing equipment for handling this issue consists of a vent valve and a shut-off valve installed in the pressure regulating box. When the pipeline pressure exceeds the set value, the vent valve opens to release pressure; if the pressure continues to rise, the shut-off valve activates to stop the gas supply. However, a monitoring blind spot exists in practical applications: when the pipeline pressure rises and remains below the vent valve's activation pressure, but is significantly higher than the rated operating pressure of the gas-using equipment, the vent valve will not activate. However, the higher pressure can cause abnormal operation of the gas-using equipment (such as stoves and boilers), making gas leaks highly likely from valves and interfaces, posing a significant safety hazard.

[0004] To address the monitoring problem of the aforementioned pressure blind zone, dedicated high-pressure acquisition devices have emerged in the prior art, such as the single-sided adjustable high-pressure acquisition device disclosed in Chinese Patent CN221629528U. This device senses pipeline pressure through a pressure tap and uses diaphragm deformation to push a diaphragm disc, changing the distance between it and an active proximity switch sensor, thereby triggering an alarm. Although this device can achieve high-pressure alarm, the active sensor it uses (i.e., the proximity switch requiring external power supply) has the following inherent drawbacks: 1) In flammable and explosive gas environments, introducing circuitry and power supply ports increases the complexity and cost of intrinsically safe explosion-proof design; 2) The reliability and stability of electronic sensors under long-term operation face challenges, and their cost is relatively high.

[0005] Therefore, there is an urgent need for a high-pressure alarm device that is simple in structure, low in cost, requires no external power supply, is inherently safe and highly reliable, in order to fill the monitoring gap in the pressure blind zone before the vent valve is activated and further improve the gas safety protection system. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a solution to the problems of explosion-proof safety hazards, low reliability, and high cost of existing high pressure acquisition devices that use active sensors. It provides an inherently safe, power-free, and structurally reliable slide-driven passive high pressure alarm device.

[0007] This utility model is implemented as follows: a slide-driven passive high-pressure alarm device, characterized by: a housing, a pressure sensing component, a pressure regulating component, and a sensor component; the housing includes a lower housing and an upper housing, the lower housing having a pressure tap; the pressure sensing component includes a diaphragm, a diaphragm disc, a positioning rod, and a clamping cap, the diaphragm being sealed between the lower and upper housings, the positioning rod passing through the diaphragm, diaphragm disc, and clamping cap and being locked by the clamping cap; the pressure regulating component includes an adjusting column and an adjusting spring, the adjusting column being threadedly connected to the upper housing, and the adjusting spring being disposed between the adjusting column and the diaphragm disc; the sensor component includes a slide rod, a reed switch, and a magnet, one end of the slide rod having a magnet that attracts the clamping cap, and the other end having a magnet that is opposite to the reed switch; the reed switch is a passive switch used to connect to an alarm control host.

[0008] More preferably, the lower housing is provided with a positioning sleeve, the positioning sleeve is provided with a flow channel hole, and the positioning rod passes through the positioning sleeve.

[0009] More preferably, the positioning sleeve is made of a material with a low coefficient of friction.

[0010] More preferably, the sensor assembly further includes a sleeve, the slide rod is inserted through the sleeve, and the reed switch is disposed inside the sleeve.

[0011] In a further preferred embodiment, the sleeve is connected to the signal line connector via a wiring conduit, and a sealing ring is provided between the wiring conduit and the sleeve and it is fixed by a set screw.

[0012] More preferably, the slide bar is provided with a limiting pin to prevent the slide bar from coming out of the sleeve.

[0013] More preferably, the lower housing is provided with at least one support pin, the top of which contacts the bottom of the membrane, for supporting the membrane assembly and adjusting its initial position.

[0014] More preferably, the upper shell is provided with a vent to maintain pressure balance inside and outside the shell.

[0015] More preferably, the adjusting column is locked and fixed by a locking nut.

[0016] More preferably, the reed switch is a normally open reed switch.

[0017] The advantages and technical effects of this utility model are as follows: Compared with the prior art, the slide-driven passive high-pressure alarm device provided by this utility model achieves significant technological progress and multiple beneficial effects. First, its core advantage lies in its inherent safety. By using a completely passive reed switch as the sensing element, the risk of electric sparks caused by the need for power supply to the monitoring terminal is completely eliminated, making it extremely suitable for flammable and explosive gas environments with a high safety level. Second, the device has a simple, reliable, and low-cost structure. It utilizes a sophisticated mechanical structure and magnetic induction principle to achieve pressure-signal conversion, eliminating the need for expensive pressure transmitters or active sensors that require matching circuitry, thus reducing manufacturing costs and maintenance complexity. Third, it has superior performance. The large-area diaphragm design makes it highly sensitive to pressure changes; the guiding mechanism (positioning sleeve, tube) ensures the accuracy and consistency of the action; and the spring adjustment mechanism facilitates flexible setting of the alarm pressure value with a wide adjustment range. Fourth, it exhibits good compatibility and adaptability. The output passive switch signal can be directly connected to existing gas leak alarm systems, achieving high pressure alarm functionality without modifying the main unit. This seamlessly expands the system's protection dimensions and effectively fills the "blind spot" in pressure monitoring before the vent valve is activated. In summary, this utility model is a safe, reliable, economical, and efficient gas pressure safety protection device with high practical value and promising market prospects. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] In the diagram: 1. Pressure tap; 2. Positioning rod; 3. Positioning sleeve; 4. Lower housing; 5. Support pin; 6. Diaphragm; 7. Fastening screw; 8. Breathing hole; 9. Upper housing; 10. First magnet; 11. Slide rod; 12. Sleeve; 13. Adjusting column; 14. Connecting pipe; 15. Signal line connector; 16. Locking nut; 17. Sealing ring; 18. Set screw; 19. Reed switch; 20. Second magnet; 21. Limit pin; 22. Locking nut; 23. Adjusting spring; 24. Pressure cap; 25. Positioning plate; 26. Diaphragm plate; 27. Flow channel hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0021] Please see Figure 1A passive high-pressure alarm device with sliding rod drive includes a housing, a pressure sensing component, a pressure regulating component, and a sensor component. The housing includes a lower housing 4 and an upper housing 9, which are fixedly connected by fastening screws. The lower housing 4 is provided with a pressure tap 1. The pressure sensing component includes a diaphragm 6, a diaphragm disc 26, a positioning rod 2, and a pressure cap 24. The diaphragm 6 is sealed between the lower housing 4 and the upper housing 9. The positioning rod 2 passes through the diaphragm 6, the diaphragm disc 26, and the pressure cap 24 and is locked by the pressure cap 24. Preferably, the positioning plate between the diaphragm disc 26 and the pressure cap 24 is used to position an adjusting spring 23. The pressure regulating component includes an adjusting column 13 and an adjusting spring 23. The adjusting column 13 is threaded to the upper housing 9, and the adjusting spring 23 is disposed on the adjusting column 13. Between column 13 and diaphragm plate 26; the sensor assembly includes slide rod 11, reed switch 19 and second magnet 20. One end of slide rod 11 is provided with first magnet 10 which is attracted to clamping cap 24, and the other end is provided with second magnet 20 which is opposite to reed switch 19; reed switch 19 is a passive switch used to connect to alarm control host; the alarm control host can issue local alarm indication after receiving passive switch signal, and at the same time, it will shut off the solenoid valve. The linkage control box that is commonly used in gas alarm systems on the market can realize this function.

[0022] This scheme constitutes an intrinsically safe passive pressure alarm core. The diaphragm sensing pressure drives the entire diaphragm assembly to move. Through the attraction between the first magnet 10 and the pressure cap 24, the pressure signal is transmitted to the slide bar 11 without contact. The displacement of the second magnet 20 at the other end of the slide bar 11 ultimately triggers the passive reed switch 19. The entire process requires no power supply to the sensor, fundamentally eliminating the risk of electrical sparks igniting gas, significantly improving safety in explosive environments. Furthermore, the magnetic triggering method is simple in structure, reliable in operation, long in life, and far less expensive than active electronic sensors.

[0023] Preferably, the lower housing 4 is provided with a positioning sleeve 3, which has a flow channel hole 27, and the positioning rod 2 passes through the positioning sleeve 3. The positioning sleeve 3 provides precise guidance and support for the positioning rod 2, ensuring that the pressure sensing component can only move vertically along the axial direction when subjected to force, avoiding skewness and jamming, thereby ensuring the accuracy and repeatability of the action. The flow channel hole 27 ensures that the gas pressure can pass through quickly and act evenly on the entire effective area of ​​the diaphragm 6, improving the sensitivity and response speed of the pressure sensing.

[0024] Preferably, the positioning sleeve 3 is made of a low-friction coefficient material. Using a low-friction coefficient material (such as polytetrafluoroethylene) to make the positioning sleeve 3 can greatly reduce the frictional resistance when the positioning rod 2 moves, making the device more sensitive to small pressure changes, further improving detection accuracy and sensitivity, while reducing wear on moving parts and extending service life.

[0025] Further preferably, the sensor assembly also includes a sleeve 12, with the slide rod 11 passing through the sleeve 12 and the reed switch 19 disposed within the sleeve 12. The sleeve 12 provides independent guiding and accommodating space for the slide rod 11, separating its movement from the pressure sensing and adjustment components, making the installation and debugging of the sensor section more independent and convenient. Encapsulating the reed switch 19 within the sleeve 12 effectively protects it from external dust, moisture, and mechanical damage, enhancing the environmental tolerance and reliability of the entire sensor assembly.

[0026] Preferably, the sleeve 12 is connected to the signal line connector 15 via a wiring conduit 14, and a sealing ring 17 is provided between the wiring conduit 14 and the sleeve 12, which is fixed by a set screw 18. This structure achieves sealed outwards of the signal line. The sealing ring 17 ensures the airtightness of the connection between the sleeve 12 and the wiring conduit 14, preventing external flammable gases from entering the device and meeting explosion-proof requirements. The set screw 18 provides mechanical locking, preventing the wiring conduit 14 from loosening and ensuring the long-term stability of the electrical connection. The signal line connector 15 facilitates quick and standardized connection to an external alarm control panel.

[0027] Preferably, the slide rod 11 is provided with a limiting pin 21 to prevent the slide rod 11 from falling out of the sleeve 12. The limiting pin 21 is a simple and effective anti-fall-out structure. During transportation, installation, or debugging, it can prevent the slide rod 11 from completely sliding out of the sleeve 12 due to gravity or accidental operation, avoiding misalignment, loss, or damage of the internal magnets, ensuring the integrity of the product before assembly and final use, and improving the stability of the product.

[0028] Further preferably, the lower housing 4 is provided with at least one support pin 5, the top end of which contacts the bottom of the diaphragm 6, for supporting the diaphragm assembly and adjusting its initial position. The support pin 5 is used to precisely set the initial zero point position of the diaphragm assembly. By screwing in or out the support pin 5, the initial arch height of the diaphragm 6 can be finely adjusted, thereby indirectly calibrating the initial balance state of the entire sensing assembly. This compensates for tolerances in parts processing and assembly, ensures consistency of action between different products, and provides the possibility for on-site fine-tuning.

[0029] More preferably, the upper shell 9 is provided with a breathing hole 8 to maintain the pressure balance inside and outside the shell.

[0030] Technical effect: The breather hole 8 connects the internal cavity of the upper shell 9 with the atmospheric environment, balancing the air pressure on the back pressure side (i.e., the spring side) of the diaphragm plate 26. This eliminates the interference of pressure difference between the inside and outside of the shell caused by changes in ambient atmospheric pressure or temperature on the deformation of the diaphragm 6, so that the output signal of the device responds purely to the gas pressure change at the pressure tap 1, greatly improving the accuracy of measurement and anti-interference ability.

[0031] Preferably, the adjusting column 13 is locked in place by a locking nut 22. The locking nut 22 is used to firmly lock the adjusting column 13 in its current position after the alarm pressure value has been set by rotating it. This effectively prevents the adjusting column 13 from loosening due to vibration or accidental contact during use, avoids unexpected changes in the spring preload, and thus ensures the long-term stability and reliability of the alarm setting value.

[0032] Preferably, the reed switch 19 is a normally open reed switch. With a normally open reed switch, the contacts are open under normal conditions, and the circuit is open. When the pressure exceeds the trigger limit, the sliding rod moves, and the second magnet 20 approaches, the contacts close, sending a closed switch signal. This "normally open, triggered closure" mode is directly compatible with the passive trigger interface of most gas alarm control hosts, simplifying wiring, providing a clear signal, and exhibiting extremely low power consumption and high reliability.

[0033] Working principle explanation: The working principle of this slide-driven passive high pressure alarm device is as follows: Gas pipeline pressure is introduced into the lower housing 4 chamber through pressure tap 1 and acts on the lower surface of diaphragm 6. When the pressure is within the normal range, the gas pressure below diaphragm 6 is balanced by the elastic force of the adjusting spring 23 applied to the diaphragm disc 26 through adjusting column 13. The entire pressure sensing assembly remains stationary, and slide 11 is in its initial position under the attraction of the first magnet 10 and the clamping cap 24. At this time, the second magnet 20 is far from the reed switch 19, and the switch is in its normal state (such as normally open). When the pressure in the pipeline rises abnormally and exceeds the preset alarm value, the pressure acting on diaphragm 6 overcomes the elastic force of the adjusting spring 23, pushing the diaphragm disc 26, positioning rod 2, and clamping cap 24 upward as a whole. The clamping cap 24 drives slide 11 to move upward synchronously through magnetic attraction, and the second magnet 20 fixed at the upper end of slide 11 moves closer to the reed switch 19. When the second magnet 20 approaches the operating distance of the reed switch 19, the reed inside the reed switch 19 actuates under the influence of the magnetic field (or closes if normally open), generating a passive switching signal. This signal is transmitted to the gas alarm control host via the signal line, triggering an audible and visual alarm and simultaneously shutting off the solenoid valve, thereby terminating the gas supply. When the pipeline pressure returns to normal, the elastic force of the adjusting spring 23 pushes the diaphragm 26 assembly to reset, and the slide rod 11 is pulled back by magnetic attraction, moving the second magnet 20 away from the reed switch 19, restoring the switch state, and deactivating the alarm.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A slide-bar driven passive high pressure alarm device, comprising, characterized in that: The system includes a housing, a pressure sensing component, a pressure regulating component, and a sensor component. The housing comprises a lower housing (4) and an upper housing (9). The lower housing (4) is provided with a pressure tap (1). The system is characterized by: The pressure sensing component includes a diaphragm (6), a diaphragm disc (26), a positioning rod (2), and a pressure cap (24). The diaphragm (6) is sealed between the lower housing (4) and the upper housing (9). The positioning rod (2) passes through the diaphragm (6), the diaphragm disc (26), and the pressure cap (24) and is locked by the pressure cap (24). The pressure regulating assembly includes an adjusting column (13) and an adjusting spring (23). The adjusting column (13) is threaded to the upper housing (9), and the adjusting spring (23) is disposed between the adjusting column (13) and the diaphragm (26). The sensor assembly includes a slide bar (11), a reed switch (19), and a second magnet (20). One end of the slide bar (11) is provided with a first magnet (10) that attracts the clamping cap (24), and the other end is provided with a second magnet (20) that is opposite to the reed switch (19). The reed switch (19) is a passive switch used to connect to the alarm control host.

2. The slide-bar driven passive high pressure alarm device according to claim 1, characterized in that, The lower housing (4) is provided with a positioning sleeve (3), the positioning sleeve (3) is provided with a flow channel hole (27), and the positioning rod (2) passes through the positioning sleeve (3).

3. The slide-driven passive high-pressure alarm device according to claim 2, characterized in that, The positioning sleeve (3) is made of a material with a low coefficient of friction.

4. The slide-bar driven passive high pressure alarm device according to claim 1, characterized in that, The sensor assembly also includes a sleeve (12), the slide rod (11) passes through the sleeve (12), and the reed switch (19) is disposed inside the sleeve (12).

5. The slide-bar driven passive high pressure alarm device according to claim 4, characterized in that, The sleeve (12) is connected to the signal line connector (15) through the connector (14). A sealing ring (17) is provided between the connector (14) and the sleeve (12) and is fixed by a set screw (18).

6. The slide-bar driven passive high pressure alarm device according to claim 4, characterized in that, The slide bar (11) is provided with a limiting pin (21) to prevent the slide bar (11) from coming out of the sleeve (12).

7. The slide-bar driven passive high pressure alarm device according to claim 1, characterized in that, The lower housing (4) is provided with at least one support pin (5), the top of the support pin (5) is in contact with the bottom of the membrane (6), and is used to support the membrane assembly and adjust its initial position.

8. The slide-bar driven passive high pressure alarm device according to claim 1, characterized in that, The upper shell (9) is provided with a breathing hole (8) to maintain the pressure balance inside and outside the shell.

9. The slide-bar driven passive high pressure alarm device according to claim 1, characterized in that, The adjusting column (13) is locked and fixed by the locking nut (22).

10. The slide-driven passive high-pressure alarm device according to claim 1, characterized in that, The reed switch (19) is a normally open reed switch.

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