Combustible gas detector for preventing poisoning of internal catalytic combustion sensor

Abstract

The utility model discloses a combustible gas detector for preventing poisoning of an internal catalytic combustion sensor, a filtering device is buckled in the vertical direction of an end cover of the detector, the filtering device comprises a protective cover and a breathable adsorption film, the protective cover is tightly matched and connected with the end cover, and the breathable adsorption film is arranged on the end cover. The cover top of the protection cover is provided with a ventilation through hole and a flow guide part, the ventilation through hole is located in the middle, the flow guide part is arranged around the ventilation through hole, the flow guide part is formed in the mode that the side portion of the cover top is in inward concave and inclined transition towards the ventilation through hole, and the ventilation adsorption film is attached to the inner wall of the cover top and covers the ventilation through hole. A flow guide groove is further formed in the outer wall of the cover top. The combustible gas detector protects the sensor, prevents the sensor from being in contact with external toxic substances, plays a role in protecting the activity of a catalyst in the sensor, filters out toxic substances appearing on site, and guarantees the normality of the catalytic combustion sensor in the detector.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial and commercial purposes point type combustible gas detector field, especially can prevent internal catalytic combustion sensor poisoning combustible gas detector. BACKGROUND

[0002] The combustible gas detector using catalytic combustion principle in the market at present, inside is catalytic combustion sensor, the catalytic combustion sensor reaction principle used in the combustible gas detector inside, is using the thermal effect of catalytic combustion, by detection element and compensation element pairing constitutes the measurement bridge, under certain temperature conditions, combustible gas occurs flameless combustion under the action of catalyst on the surface of detection element carrier, the carrier temperature just rises, through its internal platinum resistance also rises accordingly, thereby the balance bridge loses balance, and exports an electric signal proportional to combustible gas concentration.

[0003] This type sensor is susceptible to influence of toxic substances in the field environment during use in the industrial field, leads to sensor poisoning, and further affects the accuracy of combustible gas detection of the detector. CONTENT OF THE UTILITY MODEL

[0004] The utility model solves the technical problem that increases active carbon filter device to combustible gas detector, filters toxic substances appearing in the field, and guarantees normal of catalytic combustion sensor in the detector.

[0005] In order to solve the above technical problem, the utility model provides a combustible gas detector for preventing internal catalytic combustion sensor poisoning, the filter device is buckled in the vertical direction of the end cover, the filter device includes protective cover and breathable adsorption film, the protective cover is closely matched with the end cover, the cover top of protective cover has gas permeation hole and flow guide part, the gas permeation hole is located in the middle position, the flow guide part is arranged around the gas permeation hole, the flow guide part is inclined and transitioned into the gas permeation hole along the side of cover top, the breathable adsorption film is attached to the inner wall of cover top and covers the gas permeation hole, and the outer wall of cover top is also provided with flow guide groove.

[0006] Further optimization scheme, the flow guide groove is provided with a plurality of strips along the circumferential surface of the cover top along the circumference.

[0007] Further optimization scheme, a plurality of grooves are formed in the outer side surface of the protective cover.

[0008] Further optimization scheme, a plurality of convex ribs are distributed along the circumference on the inner wall of the protective cover close to the cover top, and the convex ribs extend along the cover top to the cover opening direction and are not arranged close to the cover opening.

[0009] Further optimization scheme, the shape of the convex rib is strip-shaped, and the height is not higher than 0.1 mm.

[0010] Further optimization scheme, the air-permeable adsorption film is activated carbon cloth.

[0011] Further optimization scheme, the material of the protective cover is nitrile rubber.

[0012] Further optimization scheme, the detector is provided with a limiting device for preventing the air-permeable adsorption film from moving.

[0013] Further optimization scheme, the groove and the flow guide groove are arranged in staggered positions.

[0014] Further optimization scheme, the flow guide groove is provided with 6, and the groove is provided with 18.

[0015] The technical effect of the utility model lies in: the utility model discloses a combustible gas detector capable of preventing internal catalytic combustion sensor poisoning, a filter device is buckled in the vertical direction of the end cover of the detector, the filter device includes a protective cover and an air-permeable adsorption film, the protective cover is tightly connected with the end cover, the air-permeable adsorption film protects the sensor, avoids contacting external toxic substances, and plays a role in protecting the activity of the internal catalyst of the sensor. The air-permeable adsorption film is attached to the inner wall of the cover top and covers the air-permeable hole, the outer wall of the cover top is also provided with a flow guide groove, which can guide rainwater faster, saves materials, reduces cost and is more beautiful. DRAWINGS

[0016] Figure 1 It is the combustible gas detector capable of preventing internal catalytic combustion sensor poisoning of the utility model;

[0017] Figure 2 It is the front view of the combustible gas detector of the utility model;

[0018] Figure 3 It is the three-dimensional structure schematic view of the filter device of the utility model;

[0019] Figure 4 It is the front view of the filter device of the utility model;

[0020] Figure 5 It is the side view of the filter device of the utility model;

[0021] Figure 6 It is the longitudinal sectional view of the filter device of the utility model;

[0022] Figure 7 It is the structure schematic view of the air-permeable adsorption film of the utility model. CONCRETE IMPLEMENTATION

[0023] The utility model will be further described below in combination with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings of the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0025] The utility model discloses a combustible gas detector 1 of preventing internal catalytic combustion sensor poisoning, the filter device 2 is buckled in the vertical direction of the end cover 3 of the detector 1 and is installed upside down, prevents rainwater from pouring into the inside of the protective cover. The filter device 2 includes protective cover 21 and breathable adsorption membrane 22, the protective cover 21 is connected with the end cover 3 closely, and the cover top 215 of protective cover 21 has breathable through -hole 212 and flow guide part 211, breathable through -hole 212 is located in the middle position, the flow guide part 211 is arranged around breathable through -hole 212, the flow guide part 211 is inwards recessed and inclined transition along the side of cover top 215 to breathable through -hole 212, breathable adsorption membrane 22 is attached to the inner wall of cover top 215 and covers breathable through -hole 212, and the outer wall of cover top 215 also is provided with flow guide groove 213. Flow guide groove 213 is provided with a plurality of strips along the circumferential surface of 360 degrees. A plurality of grooves 214 are formed on the outer side of protective cover 21. The groove 214 and the flow guide groove 213 are arranged in staggered positions. In the embodiment, the flow guide groove 213 is provided with 6, which can guide the rainwater faster, and save materials, reduce cost, and be more beautiful.

[0026] The groove 214 is provided with 18, which can increase the elasticity of the protective cover 21, and also has the effect of guiding rainwater.

[0027] The inner wall of protective cover 21 is close to cover top 215 position and is distributed with a plurality of convex ribs 217 along the circumference, and the convex rib 217 extends along the cover top 215 to the cover mouth 216 direction and is not close to the cover mouth 216 setting. The shape of the convex rib 217 is strip-shaped, and the height is not higher than 0.1mm. The rib can effectively prevent the protective cover 21 from loosening or falling off due to vibration or other reasons, and the length of the convex rib 217 does not extend to the cover mouth 216, leaving a distance, so that the convex rib 217 does not cause the contact surface to be uneven, affecting the sealing between the protective cover 21 and the detector end cover 3. The protective cover 21 and the end cover 3 are interference fit, and such fit can make the sealing of the protective cover 21 better.

[0028] The breathable adsorption film 22 is activated carbon cloth, which is made by using high polymer adhesive material to adhere on non-woven substrate, has good adsorption performance, thin thickness and good air permeability, can effectively adsorb various waste gas in use process, prevents the detector 1 from being poisoned, and the detector 1 is provided with a limiting device for preventing the breathable adsorption film 22 from moving.

[0029] The protective cover 21 is made of butyronitrile rubber, which is a copolymer polymerized by acrylonitrile and butadiene monomers, is not easy to volatilize gas, avoids poisoning of the detector 1, and has high wear resistance, good heat resistance, good water resistance, air tightness and excellent bonding performance.

[0030] The utility model discloses a combustible gas detection of preventing internal catalytic combustion sensor poisoning, and the filter device 2 of detector 1 is increased or decreased to carry out contrast test, and the anti-poisoning condition of detector 1 after increasing filter device 2 is verified.The assembly process is that first, the breathable adsorption film 22 selects activated carbon cloth, arranges the activated carbon cloth flat, puts into butyronitrile rubber protective cover 21, then the protective cover 21 is buckled in the vertical direction on the end cover 3 of detector 1, and the activated carbon cloth filter device 2 is installed to the limiting device.

[0031] Selecting four industrial and commercial point type combustible gas detectors 1, first, zero setting, calibration, reading back and other operations are carried out, so as to ensure that the detector 1 is accurate before the poisoning test, then two detectors 1 are selected at random, three layers of filter devices 2 are installed by using correct installation method, the breathable adsorption film 22 selects activated carbon cloth, the remaining two detectors 1 are not installed filter device 2, the above four detectors 1 are put into a sealed box, organic silicon gas is input, the detector 1 is sealed in the sealed box and is placed for 6 hours, after 6 hours, the sealed box is opened, the four detectors 1 are taken out and are placed in a gas-polluted environment for one hour, the detector 1 is waited to be stable, the detector 1 is ventilated after being stable, the same specification detection gas is input to the four detectors 1, and test data in the whole process are recorded.

[0032]

[0033] Through observation of the data recorded in the test process, it can be found that the two detectors 1 with activated carbon cloth filter device 2 have little influence on the data before and after inputting 1000ppm organic silicon gas, and the two detectors 1 without filter device 2 are poisoned and cannot work normally.

[0034] In summary, the filter device 2, i.e., the activated carbon cloth, can effectively block the influence of external substances on the sensor poisoning.

[0035] In the description of the utility model, it is necessary to explain that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the utility model, it is necessary to explain that, unless otherwise expressly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] The above-described embodiments are only preferred embodiments for fully illustrating the utility model, and the protection scope of the utility model is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the utility model are within the protection scope of the utility model. The protection scope of the utility model is subject to the claims.

Claims

1. A combustible gas detector that prevents poisoning of an internal catalytic combustion sensor, characterized by, The filter device is arranged in the vertical direction of the end cover of the detector, and comprises a protective cover and a breathable adsorption film. The protective cover is tightly connected with the end cover. The cover top of the protective cover is provided with a breathable through hole and a flow guide part. The breathable through hole is located at the middle position of the cover top. The flow guide part is arranged around the breathable through hole. The flow guide part is inclined and transitioned into the breathable through hole along the side of the cover top. The breathable adsorption film is attached to the inner wall of the cover top and covers the breathable through hole. The outer wall of the cover top is also provided with a flow guide groove.

2. A combustible gas detector that prevents poisoning of an internal catalytic combustion sensor according to claim 1, wherein The flow guide groove is provided with a plurality of flow guide grooves along the circumferential surface of 360 degrees.

3. A combustible gas detector that prevents poisoning of an internal catalytic combustion sensor as defined in claim 1, wherein A plurality of grooves are arranged on the outer side of the protective cover.

4. A combustible gas detector that prevents poisoning of an internal catalytic combustion sensor according to claim 1, wherein A plurality of convex ribs are arranged on the inner wall of the protective cover near the cover top in the circumferential direction. The convex ribs extend along the cover top to the cover opening direction and are not arranged close to the cover opening.

5. A combustible gas detector to prevent poisoning of an internal catalytic combustion sensor according to claim 4, wherein, The convex rib is in the shape of a strip and is not higher than 0.1 mm.

6. A combustible gas detector that prevents poisoning of an internal catalytic combustion sensor according to claim 1, wherein The breathable adsorption film is activated carbon cloth.

7. A combustible gas detector that prevents poisoning of an internal catalytic combustion sensor as defined in claim 1, wherein The material of the protective cover is nitrile rubber.

8. A combustible gas detector that prevents poisoning of an internal catalytic combustion sensor according to claim 1, wherein The detector is provided with a limiting device for preventing the breathable adsorption film from moving.

9. A combustible gas detector that prevents poisoning of an internal catalytic combustion sensor according to claim 3, wherein The groove and the flow guide groove are arranged in staggered positions.

10. A combustible gas detector to prevent poisoning of an internal catalytic combustion sensor according to claim 9, wherein, The flow guide groove is provided with 6 flow guide grooves, and the groove is provided with 18 grooves.

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