Anti-electromagnetic interference gas detector

Abstract

The utility model discloses an anti-electromagnetic interference gas detector, which comprises a shell assembly, a protective cover assembly, a soft rubber sleeve, a cable joint and a sensor module, the shell assembly comprises an upper shell and a lower shell, a cavity is arranged in the lower shell, the inner wall surface of the cavity is provided with a vent hole communicated with the outside, and the protective cover assembly is arranged in the cavity. The protective cover assembly comprises an inner protective cover and an outer protective cover, the outer protective cover is matched with the inner protective cover in a sleeved mode, a connecting module is fixedly installed in the inner protective cover, the sensor module is connected and matched with the connecting module, the upper shell, the lower shell, the inner protective cover and the outer protective cover are all made of metal, and the cable connector is arranged on the outer side of the lower shell. The soft rubber sleeve is arranged on the outer surface of the lower end of the outer protective cover. According to the utility model, protection can be carried out from a structure angle, then processing is carried out from a circuit angle, anti-electromagnetic interference protection is carried out in all directions, and the device can be applied to various places with severe electromagnetic environments.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas detector technical field especially relates to a kind of anti-electromagnetic interference's gas detector. BACKGROUND

[0002] At present, the existing gas detector applied will be filled with various electromagnetic interference in use environment, such as the wireless signal emitted by mobile phone, radio FM frequency signal, the electric fast pulse group signal generated by PLC control cabinet start-stop, lightning, electrostatic discharge and so on, these electromagnetic interference especially influence the precision of gas detector measurement signal, and further influence the reliability of gas detector, and the method for the common gas detector to resist electromagnetic interference is to make anti-electromagnetic interference circuit processing, which improves the anti-interference performance of gas detector to some extent. This anti-electromagnetic interference circuit processing method is helpful for slight electromagnetic interference environment, but it does not have the desired effect for places with slightly stronger electromagnetic interference.

[0003] Through retrieval, the utility model patent document with announcement No.CN215263393U discloses an anti-interference gas detector, which comprises a shielding cover and a gas detector body, the inner wall of the shielding cover is coated with a conductive material layer, the gas detector body is provided with a ground plane, and the shielding cover covers the outside of the gas detector body, and the inner wall thereof is electrically connected with the ground plane.

[0004] The above-mentioned gas detector mainly enhances the anti-interference ability of the gas detector through the shielding cover and the conductive material layer of the inner wall thereof, but the shielding layer still has a communication with the outside, cannot achieve comprehensive protection, and has a protection loophole. UTILITY MODEL CONTENT

[0005] The utility model aims at providing an anti-electromagnetic interference gas detector, which can be protected from the structural point of view first, and then processed from the circuit point of view, and can be protected against electromagnetic interference in all directions, and is suitable for various places with severe electromagnetic environment.

[0006] The utility model adopts the following technical solutions:

[0007] An anti-electromagnetic interference gas detector, comprising a shell assembly, a protective cover assembly, a soft rubber sleeve, a cable joint and a sensor module,

[0008] The shell assembly comprises an upper shell and a lower shell, the lower shell is provided with a cavity, and a ventilation hole communicating with the outside is formed in the inner wall surface of the cavity,

[0009] The protective cover assembly comprises an inner protective cover and an outer protective cover, the outer protective cover is sleeved with the inner protective cover, the inner protective cover is fixedly installed with a connecting module, and the sensor module is connected with the connecting module,

[0010] The upper shell, the lower shell, the inner protective cover and the outer protective cover are made of metal,

[0011] The cable joint is arranged on the outer side of the lower shell,

[0012] The soft rubber sleeve is arranged on the outer surface of the lower end of the outer protective cover.

[0013] Optionally, the rear end of the inner protective cover is provided with a connecting pipe, and the inner protective cover is connected and matched with the air hole through the connecting pipe at the upper end.

[0014] Optionally, the middle part of the upper shell is provided with an observation hole, and a circular tempered glass is fixedly arranged on the lower surface of the upper shell at a position corresponding to the observation hole, wherein the tempered glass has a sandwich layer, and a high-transmittance electromagnetic shielding adhesive film is arranged in the sandwich layer.

[0015] Optionally, the upper shell and the lower shell are fixedly connected in a threaded mode, and a circuit board protective cover is fixedly arranged in the inner cavity of the lower shell, and an integrated circuit board is fixedly installed below the circuit board protective cover.

[0016] Optionally, the lower end surface of the outer protective cover is provided with a stepped accommodating groove, the accommodating groove is provided with a fiber felt, and the lower end surface of the soft rubber sleeve is provided with a through hole communicating with the outside.

[0017] Optionally, the inner cavity of the outer protective cover communicates with the accommodating groove, and a filter sheet is arranged at the bottom of the inner cavity, a compression ring is arranged above the filter sheet, the compression ring is threadedly matched with the inner wall of the outer protective cover, and the filter sheet is fixed in position.

[0018] Optionally, a sealing ring is arranged on the inner bottom surface of the compression ring, and the sealing ring is in contact with the sensor module.

[0019] Optionally, a column is fixedly arranged on the right end surface of the outer protective cover, and a plastic buckle is fixedly arranged on the outer end surface of the column.

[0020] Optionally, a countersunk hole is arranged on the stepped end surface of the inner protective cover and corresponds to the column, the large hole diameter of the countersunk hole is matched with the diameter of the column, and the small hole diameter is matched with the plastic buckle.

[0021] Optionally, a cable interface is arranged on the left side surface of the lower shell, and the cable joint is connected with the cable interface.

[0022] In summary, the utility model has the following beneficial effects:

[0023] 1. The utility model discloses a shell, the electromagnetic interference contact source of air inlet, toughened glass, cable interface etc. is treated to resist electromagnetic interference, protects from the structure angle first, then handles from the circuit angle, and the electromagnetic interference protection of all -round is carried out, can be applied to various electromagnetic environment bad place

[0024] 2. The utility model discloses a shell, the electromagnetic interference contact source of air inlet, toughened glass, cable interface etc. is treated to resist electromagnetic interference, protects from the structure angle first, then handles from the circuit angle, and the electromagnetic interference protection of all -round is carried out, can be applied to various electromagnetic environment bad place DRAWINGS

[0025] Figure 1 It is the whole structure schematic diagram of the utility model;

[0026] Figure 2 It is the explosion structure schematic diagram of the utility model;

[0027] Figure 3 It is the sectional view of the utility model Figure 2 ;

[0028] Figure 4 It is the structure schematic diagram of the lower shell of the utility model;

[0029] Figure 5 It is the structure schematic diagram of the protective cover subassembly of the utility model;

[0030] Figure 6 It is the sectional view of the protective cover subassembly of the utility model Figure 1 ;

[0031] Figure 7 It is the sectional view of the protective cover subassembly of the utility model Figure 2 .

[0032] In the drawing, 1, shell subassembly;2, protective cover subassembly;3, soft rubber cover;31, fiber felt;4, cable joint;51, sensor module;52, connecting module;11, lower shell;111, air hole;12, upper shell;121, toughened glass;13, circuit board protective cover;14, integrated circuit board;21, lower protective cover;211, cylinder;212, plastic buckle;213, placing groove;214, filter disc;215, compression ring;216, sealing ring;22, upper protective cover;221, countersunk hole;222, rubber ring;223, connecting pipe. DETAILED DESCRIPTION

[0033] The principles and spirits of the utility model are explained in detail below by referring to several representative embodiments of the utility model.

[0034] Referring to Figures 1-7 , the utility model will be described in detail below in combination with the drawings and examples:

[0035] As Figures 1-3 shown, an electromagnetic interference resistant gas detector, comprising a shell assembly 1, a protective cover assembly 2, a soft rubber sleeve 3, a cable joint 4 and a sensor module 51, the shell assembly 1 and the protective cover assembly 2 can be assembled and merged, the shell assembly 1 comprises an upper shell 12 and a lower shell 11, the lower shell 11 is provided with a cavity, a gas hole 111 communicating with the outside is formed in the inner wall surface of the cavity, the protective cover assembly 2 comprises an inner protective cover 22 and an outer protective cover 21, the outer protective cover 21 is sleeved outside the inner protective cover 22, the inner protective cover 22 is fixedly installed with a connecting module 52, the sensor module 51 is arranged in the connecting module 52 to detect and analyze the gas, the above-mentioned sensor module 51 and connecting module 52 are prior art, and will not be described in detail here.

[0036] As Figures 1-3 shown, the upper shell 12, the lower shell 11, the inner protective cover 22 and the outer protective cover 21 are all made of metal material, and the metal is widely used as electromagnetic shielding material due to its high conductivity and reflection and absorption effect on electromagnetic waves to protect the internal electronic equipment or system from the interference of external electromagnetic waves.

[0037] As Figures 1-5 shown, the rear end of the inner protective cover 22 is provided with a connecting pipe 223, the inner protective cover 22 is communicated with the inner cavity of the lower shell 11 through the connecting pipe 223 and the gas hole 111, and the connecting pipe 223 can be connected with the inner wall of the gas hole 111 in a threaded connection mode; the connecting pipe 223 can also be connected with the gas hole 111 in a plug-in mode, and a jacking bolt is used to jack the connecting pipe 223, so that the inner protective cover 22 is more stable in connection with the lower shell 11.

[0038] As Figure 2 shown, the upper shell 12 is provided with an observation hole in the middle, and the lower surface of the upper shell 12 at the corresponding position of the observation hole is provided with a circular tempered glass 121 matched therefor, the tempered glass 121 has a sandwich layer, and the sandwich layer is provided with a high-transmittance electromagnetic shielding adhesive film, the transmittance of the high-transmittance electromagnetic shielding adhesive film is greater than 90%, which can not only affect the normal observation of the display of the window, but also effectively prevent electromagnetic interference signals from entering the inside of the shell assembly 1.

[0039] As Figures 1-3As shown, the upper shell 12 and the lower shell 11 are fixedly connected by screwing, and after the upper shell and the lower shell are threadedly connected, the upper shell and the lower shell can be secondarily fixed by using bolts to prevent manual disassembly of the upper shell and the lower shell, and a circuit board protection cover 13 is fixedly arranged in the inner cavity of the lower shell 11, and an integrated circuit board 14 is fixedly arranged below the circuit board protection cover 13, the integrated circuit board 14 adopts a transient suppression, filter differential circuit to amplify differential mode signals and suppress common mode signals, so as to realize the functions of suppression and noise reduction, and the integrated circuit board 14 is prior art and will not be described in detail here.

[0040] As shown in the figure, Figures 1-6 The soft rubber sleeve 3 is arranged outside the front end of the outer protection cover 21 and sleeved on the outer surface of the outer protection cover 21, the lower end surface of the outer protection cover 21 is provided with a stepped accommodating groove 213, the fiber felt 31 is arranged in the accommodating groove 213, and the lower end surface of the soft rubber sleeve 3 is provided with a through hole communicating with the outside;

[0041] In the utility model, the fiber felt 31 in the accommodating groove 213 can be fixed by the soft rubber sleeve 3, the fiber felt 31 is prior art, and is an electromagnetic shielding fiber felt, the electromagnetic shielding fiber felt can normally pass through the detection gas, and can effectively prevent electromagnetic interference signals from entering the inside of the protection cover assembly 2, so that the interference on the sensor module 51 is prevented, and the detection accuracy of the sensor module 51 is effectively improved.

[0042] As shown in the figure, Figures 5-6 The inner cavity of the outer protection cover 21 communicates with the accommodating groove 213, and the bottom of the inner cavity is provided with a filter sheet 214 for filtering the detection gas, the upper side of the filter sheet 214 is provided with a pressing ring 215, the pressing ring 215 is threadedly matched with the inner wall of the outer protection cover 21 to fix the position of the filter sheet 214, and a sealing ring 216 is arranged on the inner bottom surface of the pressing ring 215, the sealing ring 216 is in contact with the sensor module 51 and is used to assist in stabilizing the sensor module 51 to improve the detection accuracy.

[0043] As shown in the figure, Figures 5-7 The right end surface of the outer protection cover 21 is fixedly provided with a column body 211, the outer end surface of the column body 211 is fixedly provided with a plastic buckle 212, a countersunk hole 221 is formed in the stepped end surface of the inner protection cover 22 and corresponds to the position of the column body 211, the large hole diameter of the countersunk hole 221 is matched with the diameter of the column body 211, and the small hole diameter is matched with the plastic buckle 212, the column body 211 and the plastic buckle 212 can be inserted into the countersunk hole 221, and the combined connection of the inner protection cover 22 and the outer protection cover 21 can be completed, the outer protection cover 21 after connection cannot rotate and move, and the stability of the internal sensor module 51 during detection can be effectively protected.

[0044] Specifically, after the inner protective cover 22 is connected and fixed with the lower shell 11, the sensor module 51 is inserted into the connecting module 52, and then the outer protective cover 21 is connected with the inner protective cover 22, at this time, the fiber felt 31 has been fixed in the accommodating groove 213 by the soft rubber sleeve 3, which can facilitate the maintenance and replacement of the sensor module 51 and the regular replacement of the fiber felt 31, and improve the maintenance efficiency of the device.

[0045] As shown in Figures 6-7 The inner protective cover 21 is sleeved with a rubber ring 222 at the position close to the stepped end face, so as to enhance the air tightness of the connection between the outer protective cover 21 and the inner protective cover 22.

[0046] As shown in Figures 1-2 The left side of the lower shell 11 is provided with a cable interface for leading out the power cable, and the cable connector 4 is installed at the position of the cable interface. The cable connector 4 can adopt an anti-electromagnetic interference connector, which can effectively avoid the interference of the wires and terminals in the connector from the external electromagnetic environment. One end of the cable interface is a wiring end connected with the power cable led out from the lower shell 11, and the other end of the cable interface is a plug-in end connected with the cable connector 4. During construction, the cable is connected to the plug-in end of the cable connector 4, and the above-mentioned anti-electromagnetic interference connector is a commercially available product, which will not be described in detail here.

[0047] As some terms are used in the description and claims to refer to certain components. Those skilled in the art should understand that hardware manufacturers may use different names to refer to the same component. The description and claims of this specification do not distinguish components by name, but by the functional difference between components. As mentioned throughout the description and claims, "including" is an open term, which should be interpreted as "including but not limited to". "Approximately" means within an acceptable error range, and those skilled in the art can solve the technical problems within a certain error range, and basically achieve the technical effects.

[0048] It should be noted that the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the products or systems comprising a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such products or systems. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the product or system comprising the element.

[0049] The foregoing description illustrates and describes several preferred embodiments of the present application. However, it is to be understood that the application is not limited to the precise forms described, and that changes can be made therein without departing from the scope of the present application. Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. Therefore, the specification and examples are to be considered exemplary only, with a true scope and spirit of the application being indicated by the following claims.

Claims

1. A gas detector resistant to electromagnetic interference, characterized by: The shell assembly (1), the protective cover assembly (2), the soft rubber sleeve (3), the cable joint (4) and the sensor module (51), The shell assembly (1) includes an upper shell (12) and a lower shell (11), and the lower shell (11) is provided with a cavity, and a ventilation hole (111) is formed in the inner wall of the cavity and communicates with the outside, The protective cover assembly (2) includes an inner protective cover (22) and an outer protective cover (21), and the outer protective cover (21) is sleeved with the inner protective cover (22), and the inner protective cover (22) is fixedly installed with a connecting module (52), and the sensor module (51) is connected with the connecting module (52), The upper shell (12), the lower shell (11), the inner protective cover (22) and the outer protective cover (21) are all made of metal, The cable joint (4) is arranged on the outer side of the lower shell (11), The soft rubber sleeve (3) is arranged on the lower end surface of the outer protective cover (21).

2. The electromagnetic interference resistant gas detector of claim 1, wherein: The rear end of the inner protective cover (22) is provided with a connecting pipe (223), and the inner protective cover (22) is connected with the ventilation hole (111) through the connecting pipe (223) at the upper end.

3. The electromagnetic interference resistant gas detector of claim 1, wherein: The upper shell (12) is provided with an observation hole in the middle, and a circular tempered glass (121) is fixedly arranged on the lower surface of the upper shell at the corresponding position of the observation hole, and the tempered glass (121) has a sandwich structure and a high-transmittance electromagnetic shielding film is arranged in the sandwich structure.

4. The electromagnetic interference resistant gas detector of claim 1, wherein: The upper shell (12) and the lower shell (11) are fixedly connected by screwing, and a circuit board protective cover (13) is fixedly arranged in the inner cavity of the lower shell (11), and an integrated circuit board (14) is fixedly installed below the circuit board protective cover (13).

5. The electromagnetic interference resistant gas detector of claim 1, wherein: The lower end surface of the outer protective cover (21) is provided with a stepped accommodating groove (213), the accommodating groove (213) is provided with a fiber felt (31), and the lower end surface of the soft rubber sleeve (3) is provided with a through hole which communicates with the outside.

6. A gas detector resistant to electromagnetic interference according to claim 5, characterized in that: The inner cavity of the outer protective cover (21) communicates with the accommodating groove (213), and a filter sheet (214) is arranged at the bottom of the inner cavity, a pressing ring (215) is arranged above the filter sheet (214), the pressing ring (215) is threadedly connected with the inner wall of the outer protective cover (21) to fix the position of the filter sheet (214).

7. A gas detector resistant to electromagnetic interference according to claim 6, characterised in that: The inner bottom surface of the pressing ring (215) is provided with a sealing ring (216), and the sealing ring (216) is in contact with the sensor module (51).

8. The electromagnetic interference resistant gas detector of claim 1, wherein: The right end surface of the outer protective cover (21) is fixedly provided with a column body (211), and the outer end surface of the column body (211) is fixedly provided with a plastic buckle (212).

9. A gas detector resistant to electromagnetic interference according to claim 8, characterised in that: The stepped end surface of the inner protective cover (22) is provided with a countersunk hole (221) at a position corresponding to the column body (211), and the large hole diameter of the countersunk hole (221) is matched with the diameter of the column body (211), and the small hole diameter is matched with the plastic buckle (212).

10. The electromagnetic interference resistant gas detector of claim 1, wherein: The left side surface of the lower shell (11) is provided with a cable interface, and the cable joint (4) is connected with the cable interface.

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