General throttling calibration cover for diffusion type combustible gas alarm

Abstract

The present application relates to the technical field of gas detection instrument calibration, in particular to a universal throttling calibration cover for a diffusion type combustible gas alarm, comprising: a main shell provided with a hollow inner cavity, the main shell being provided with an air inlet and an air outlet located at different sides; an interface, at least two being provided; a throttling layer, provided in the inner cavity, the throttling layer separating the inner cavity into an upstream air inlet buffer cavity and a downstream gas distribution cavity in communication, the air inlet buffer cavity being in communication with the air inlet, and the gas distribution cavity being in communication with the interface. The calibration cover provided by the present application can connect multiple alarms at a time and realize synchronous calibration, which helps to improve batch operation efficiency; the high-speed airflow is converted into large-area low-speed uniform upward airflow in the cover through the throttling layer, and the path of entering from below and exiting from above is matched, so that the concentration in the gas distribution cavity and around each probe is quickly and uniformly homogenized, thereby improving calibration precision and consistency, and the calibration cover is suitable for professional fields related to gas alarm management, maintenance and quality assurance.

Description

Technical Field

[0001] This invention relates to the field of gas detection instrument calibration technology, specifically a universal throttling calibration cover for a diffusion-type combustible gas alarm. Background Technology

[0002] Diffusion-type combustible gas detectors are widely used in industrial safety and require periodic calibration using standard gases. During calibration, a calibration cover must be installed on the gas sensor probe of the detector to form a sealed chamber through which standard gas is introduced. For example, CN211827527U discloses a gas switching device for calibrating a diffusion-type combustible gas alarm. It includes gas standard substance A, gas standard substance B, gas standard substance C, zero-point gas, pressure regulating valve A, pressure regulating valve B, pressure regulating valve C, pressure regulating valve D, check valve A, check valve B, check valve C, check valve D, pneumatic valve A, pneumatic valve B, pneumatic valve C, pneumatic valve D, electronic flow meter, calibration cover, and control unit. The four pressure regulating valves control the pressure status of the four standard gases, the four check valves prevent the bypass gas from flowing back in the pipeline, the control unit controls the opening and closing status of the four pneumatic valves to introduce the appropriate gas standard substance into the combustible gas alarm under test, the control unit controls the electronic flow meter to introduce the appropriate gas flow rate into the combustible gas alarm under test, and the calibration cover is used to fully cover the gas inlet of the combustible gas alarm under test.

[0003] However, current calibration devices generally suffer from the following problems: First, poor versatility; interfaces are mostly designed for specific models, requiring testing institutions to stock various specifications of covers, resulting in high management costs. Second, poor sealing; non-original covers are incompatible with the housing, easily leading to gas leakage, unstable concentration within the cavity, and affecting calibration accuracy. Third, only one device can be calibrated at a time, resulting in low efficiency. When facing batch calibration tasks, repeated disassembly and assembly, and waiting are required, which is time-consuming and labor-intensive. Fourth, the gas directly impacts the sensor at high speed, resulting in an uneven concentration field within the cavity and easily fluctuating readings.

[0004] Therefore, there is an urgent need for a universal and efficient calibration device that can be adapted to the shape of various alarm probes, can form a stable and uniform concentration field, and can calibrate multiple alarms simultaneously. Summary of the Invention

[0005] To address the problems in the prior art, the present invention provides a universal throttling calibration cover for a diffusion-type combustible gas alarm.

[0006] This invention is achieved through the following technical solution: A universal throttling calibration cover for a diffusion-type combustible gas alarm includes: The main housing has a hollow inner cavity, and air inlets and outlets are located on different sides of the main housing; There are at least two interfaces located on the main housing, which are used to connect to the alarm probe. A throttling layer is installed in the inner cavity, which divides the inner cavity into an upstream intake buffer chamber and a downstream gas distribution chamber. The intake buffer chamber is connected to the intake port, and the gas distribution chamber is connected to the interface.

[0007] Preferably, an elastic sealing ring is provided at the interface, which is used to connect the interface and the alarm probe.

[0008] Preferably, the elastic sealing ring has a flared, trumpet-shaped structure.

[0009] Preferably, multiple interfaces are evenly arranged on the main housing.

[0010] Preferably, the interface is also provided with a locking mechanism, which is an adjustable structure such as a buckle, clamp, or strap.

[0011] Preferably, the exhaust port is located at the top of the main housing, and the air inlet is located at the bottom of the main housing or below the side wall.

[0012] Preferably, the exhaust port is equipped with a magnetic pressure relief valve. The valve plate of the magnetic pressure relief valve is normally closed under the action of magnetic attraction or gravity. When the air pressure inside the main housing is greater than the external atmospheric pressure, the valve plate is automatically opened to release the air.

[0013] Preferably, the throttling layer is made of a porous material with a pore size of 5~200μm, and the pores of the porous material serve as the connecting channel between the intake buffer chamber and the gas distribution chamber.

[0014] Preferably, the main housing is made of a transparent material.

[0015] Preferably, the interface is detachably connected to the main housing, and the interface is configured with a variety of different specifications.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a universal throttling calibration cover for diffusion-type combustible gas alarms. Multiple interfaces on a single main housing allow for simultaneous connection and calibration of multiple alarms, shortening batch calibration time and improving the operational efficiency of testing organizations. Simultaneously, the throttling layer converts high-speed airflow into a large-area, low-speed, and uniform upward airflow, avoiding direct impact on the alarm. Combined with inlets and outlets on different sides, this ensures rapid homogenization of gas concentration within the gas distribution chamber and around each probe sensor, further improving calibration accuracy and consistency.

[0017] Furthermore, a horn-shaped elastic sealing ring is provided at the interface, which can be tightly fitted to alarm probes of different outer diameters and shapes (cylindrical, square, etc.), allowing for quick connection to different models of alarms without the need to replace parts.

[0018] Furthermore, the magnetic pressure relief valve is used to ensure that a slight positive pressure is maintained in the cavity, while automatically releasing excess pressure to prevent the gas from being compressed and causing changes in concentration.

[0019] Furthermore, defining the positions of the air inlet and outlet to form a bottom-in, top-out gas flow path can improve the gas exchange efficiency within the gas distribution chamber. Moreover, the unidirectional flow from bottom to top ensures that the gas must pass through the entire chamber space, continuously flushing and evenly covering the surface of each probe sensor. This avoids measurement deviations caused by short circuits in the air inlet or local concentration lag, thereby achieving rapid uniformity of gas concentration in both spatial and temporal dimensions, which helps improve real-time and accurate monitoring. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a universal throttling calibration cover for a diffusion-type combustible gas alarm according to the present invention; Figure 2 This is a cross-sectional view of a universal throttling calibration cover for a diffusion-type combustible gas alarm according to the present invention; Figure 3 This is a schematic diagram of a magnetic pressure relief valve in a universal throttling calibration cover for a diffusion-type combustible gas alarm according to the present invention; Figure 4 This is a schematic diagram of the assembly of a universal throttling calibration cover and an alarm for a diffusion-type combustible gas alarm according to the present invention.

[0021] In the diagram, 1. Main housing; 11. Inlet buffer chamber; 12. Gas distribution chamber; 2. Interface; 3. Elastic sealing ring; 4. Throttling layer; 5. Inlet; 6. Exhaust port; 61. Valve plate; 62. Permanent magnet; 7. Locking mechanism; 8. Sensor; 9. Alarm. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0023] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0024] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0025] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0026] This invention discloses a universal throttling calibration cover for a diffusion-type combustible gas alarm, with reference to... Figure 1 , 2 3, including: The main housing 1 has a hollow inner cavity. The main housing 1 is made of a transparent material, such as acrylic, to allow observation of the gas distribution chamber 12 or the interface 2.

[0027] The main housing 1 is provided with an air inlet 5 and an air outlet located on different sides, and the exhaust port 6 is located at the top of the main housing 1. The air inlet 5 is located at the bottom or below the side wall of the main housing 1 to form a bottom-in, top-out path to ensure rapid homogenization of the concentration in the gas distribution chamber 12 and around each probe sensor 8.

[0028] Interface 2, at least two of which are provided, are located on the main housing 1. Interface 2 is used to connect to the alarm probe. A throttling layer 4 is disposed in the inner cavity, dividing the inner cavity into an upstream intake buffer chamber 11 and a downstream gas distribution chamber 12. The intake buffer chamber 11 is connected to the air inlet 5, and the gas distribution chamber 12 is connected to the interface 2. In one embodiment, the throttling layer 4 is made of a porous material, such as porous plastic, porous ceramic, or polymer microporous sheet, with a pore size of 5~200μm, using the pores of the porous material as the connecting channel between the intake buffer chamber 11 and the gas distribution chamber 12.

[0029] An elastic sealing ring 3 is provided at interface 2, which is used to connect interface 2 and the alarm probe. In one embodiment, refer to... Figure 4 The elastic sealing ring 3 has a flared, horn-shaped structure and is used to elastically clamp onto the outer shell of the alarm probe.

[0030] Exhaust port 6 is equipped with a magnetic pressure relief valve, see reference. Figure 3 It includes a valve plate 61 and a permanent magnet. The valve plate 61 is normally closed under the action of magnetic attraction or gravity. When the air pressure inside the main housing 1 is greater than the external atmospheric pressure, the valve plate 61 is automatically opened to exhaust air.

[0031] In one embodiment, multiple interfaces 2 are evenly arranged on the main housing 1, such as 2, 3, 4, 6, etc.

[0032] In one embodiment, a locking mechanism 7 is also provided at the interface 2. The locking mechanism 7 is an adjustable structure such as a buckle, clamp or strap, so as to tighten and fix the flexible sealing ring to the alarm probe housing.

[0033] In one embodiment, the interface 2 is detachably connected to the main housing 1, and the interface 2 is configured with various different specifications.

[0034] Example 1 The main housing 1 is made entirely of transparent polycarbonate material, providing excellent light transmittance and facilitating continuous observation of internal airflow distribution, condensation, and the operational status of each interface 2. (Refer to...) Figure 1 The main housing 1 has four outwardly protruding cylindrical interfaces 2 evenly distributed on its side wall, facing four directions respectively, which can connect to four alarms 9 at a time. At the end opening of each interface 22, there is an integrally vulcanized elastic sealing ring 3 with a flared outward opening in the shape of a horn. The material is silicone, with a thickness of 2mm, and has good elasticity and deformation ability.

[0035] The main housing 1 has an air inlet 55 at its bottom center, with a standard quick-connect fitting at its outer end for quick connection to standard gas lines. The main housing 1 also has an exhaust port 6 at its top center, which can be either equipped with a quick-connect fitting or directly connected to the atmosphere. Inside the main housing 1, above the air inlet 5 and below all the ports 2, a horizontally placed circular throttling layer 4 is formed. This throttling layer 4 is a sintered stainless steel powder sheet with a pore size of approximately 100 μm and a thickness of 3 mm, and is fixed to the inner wall of the housing using sealing slots. The inner ports of all four ports 2 are connected to the side walls of the gas distribution chamber 12, ensuring that airflow can freely enter each port 2.

[0036] like Figure 3 As shown, a magnetic pressure relief valve is integrated into the exhaust port 6 at the top. Its structure is as follows: a ring-shaped permanent magnet 62 is embedded in the inner wall of the exhaust port 6, and a lightweight nickel-plated iron valve plate 61 with a diameter slightly larger than the exhaust hole covers the bottom of the exhaust hole. Under normal conditions, the valve plate 61 is closed by gravity and weak magnetic attraction; when the air pressure inside the cavity is slightly higher than the outside, the air pressure can push the valve plate 61 open a gap to achieve one-way exhaust.

[0037] like Figure 4 As shown, each interface 2 is equipped with a snap-on locking mechanism 7. In this embodiment, it is a toothed plastic clamp, and the tightness can be adjusted by the ratchet. In use, the alarm probe is directly pushed into the elastic sealing ring 3 of the interface 2. Because the sealing ring is flared and funnel-shaped, it automatically guides and adapts to the diameter and shape of the alarm probe's housing. After being pushed in place, the clamp is tightened, so that the elastic sealing ring 3 is evenly tightened on the alarm probe housing, thus forming a reliable seal. At this time, the gas sensor 8 at the front end of the alarm probe is exposed inside the cavity of the interface 2.

[0038] The operating procedure is as follows: First, insert each alarm probe into its respective interface 2 and tighten the seal to ensure a reliable connection. Then, connect the standard gas to the inlet 5 through a flow meter. Set the flow rate (e.g., 800 ml / min). The standard gas enters the inlet buffer chamber 11, is dispersed into numerous slow, fine streams through the large-area micropores of the throttling layer 4, rises horizontally, and quickly fills the entire gas distribution chamber 12. It then evenly reaches the sensor 8 of each alarm probe through each interface 2. The existing air and excess mixture in the chamber are discharged from the top exhaust port 6 through the magnetic valve plate 61. Typically, within 30 seconds, all alarms 9 will be in a completely uniform and stable standard concentration atmosphere. The operator can clearly see through the fully transparent main housing 1 that there is no liquid or impurities in the chamber. After the readings of each alarm 9 stabilize, the data from all four devices are read and recorded at once, completing the batch calibration.

[0039] This invention provides a universal throttling calibration cover for a diffusion-type combustible gas alarm. During use, gas enters the gas buffer chamber through the inlet 5, then passes through the porous structure of the throttling layer 4, where it is uniformly dispersed and slowed down before entering the gas distribution chamber 12. Finally, it flows uniformly to each alarm probe through the interfaces 2. The calibration cover provided by this invention can connect multiple alarms 9 at once and achieve synchronous calibration, which helps improve the efficiency of batch operations. Inside the cover, the throttling layer 4 transforms high-speed airflow into a large-area, low-speed, uniformly rising airflow. Combined with the bottom-in, top-out path, this ensures rapid and uniform concentration within the gas distribution chamber 12 and around each probe, thereby improving calibration accuracy and consistency. This invention is suitable for professional fields involving the management, maintenance, and quality assurance of gas alarms 9.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the technical solution of the present invention in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A universal throttling calibration cover for a diffusion-type combustible gas alarm, characterized in that, include: The main housing (1) has a hollow inner cavity, and the main housing (1) has an air inlet (5) and an air outlet located on different sides; Interface (2), at least two are provided, located on the main housing (1), and interface (2) is used to connect to the alarm probe; Throttling layer (4) is set in the inner cavity. Throttling layer (4) divides the inner cavity into an upstream intake buffer chamber (11) and a downstream gas distribution chamber (12). The intake buffer chamber (11) is connected to the intake port (5), and the gas distribution chamber (12) is connected to the interface (2).

2. The universal throttling calibration cover for the diffusion-type combustible gas alarm according to claim 1, characterized in that, An elastic sealing ring (3) is provided at the interface (2), which is used to connect the interface (2) and the alarm probe.

3. The universal throttling calibration cover for the diffusion-type combustible gas alarm according to claim 2, characterized in that, The elastic sealing ring (3) has a flared, trumpet-shaped structure.

4. The universal throttling calibration cover for the diffusion-type combustible gas alarm according to claim 1, characterized in that, Multiple interfaces (2) are evenly arranged on the main housing (1).

5. The universal throttling calibration cover for the diffusion-type combustible gas alarm according to claim 1, characterized in that, The interface (2) is also provided with a locking mechanism (7), which is an adjustable structure such as a buckle, clamp or strap.

6. The universal throttling calibration cover for the diffusion-type combustible gas alarm according to claim 1, characterized in that, The exhaust port (6) is located at the top of the main housing (1), and the air inlet (5) is located at the bottom of the main housing (1) or below the side wall.

7. The universal throttling calibration cover for the diffusion-type combustible gas alarm according to claim 1, characterized in that, The exhaust port (6) is equipped with a magnetic pressure relief valve. The valve plate (61) of the magnetic pressure relief valve is normally closed under the action of magnetic attraction or gravity. When the air pressure inside the main housing (1) is greater than the external atmospheric pressure, the valve plate (61) is automatically opened to exhaust air.

8. The universal throttling calibration cover for the diffusion-type combustible gas alarm according to claim 1, characterized in that, The throttling layer (4) is made of porous material with a pore size of 5~200μm. The pores of the porous material serve as the connecting channels between the intake buffer chamber (11) and the gas distribution chamber (12).

9. The universal throttling calibration cover for the diffusion-type combustible gas alarm according to claim 1, characterized in that, The main shell (1) is made of transparent material.

10. The universal throttling calibration cover for the diffusion-type combustible gas alarm according to claim 1, characterized in that, The interface (2) is detachably connected to the main housing (1), and the interface (2) is configured with a variety of different specifications of interface (2).

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