CN203324745U - Compound explosion-proof electronic switch - Google Patents
Compound explosion-proof electronic switch Download PDFInfo
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- CN203324745U CN203324745U CN2013204673213U CN201320467321U CN203324745U CN 203324745 U CN203324745 U CN 203324745U CN 2013204673213 U CN2013204673213 U CN 2013204673213U CN 201320467321 U CN201320467321 U CN 201320467321U CN 203324745 U CN203324745 U CN 203324745U
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Abstract
Provided is a compound explosion-proof electronic switch which comprises a casing. The casing is composed of a horizontal cavity and a vertical cavity which are communicated. The front end of the horizontal cavity is in sealing connection with a plug and the rear end of the horizontal cavity is in sealing connection with a cable sealing joint to form an explosion-proof chamber; one end of the vertical cavity is connected with the explosion-proof chamber via a safety barrier, and the other end of the vertical cavity is in sealing connection with a perforated joint to form an intrinsic safe chamber; and the joint is equipped with a respirator assembly and communicated with the intrinsic safe chamber, a metal leading-out wire of a piezoelectric core penetrates through a press ring II in a cavity II of the intrinsic safe chamber and is connected with one end of the safety barrier, and the other end of the safety barrier is connected with a main circuit board and a display circuit board in the explosion-proof chamber. According to the utility model, it is solved the problems that a single explosion-proof electronic switch has large measuring errors when satisfying explosion-proof characteristics, and that an intrinsic safe switch requires an additional safety barrier, thereby successively realizing comprehensive explosion-proof characteristics of the electronic switch, and possessing very highly practical values.
Description
Technical field
The utility model belongs to oil-well drilling equipment intellectualized technology field, is specifically related to a kind of compound explosion-prevention electronic switch.
Background technology
As everyone knows, due to the on-the-spot bad working environments environment that oil gas blast and field work easily occur of oil drilling and extracting equipment, pressure (liquid level) electronic switch that general conventional environment is used easily produces electric spark and dangerous temperature, and can not be for there be the oil-well drilling equipment of flammable explosive gas, steam in institute's warp.And electronic switch is to realize indispensable vitals in oil drilling and extracting equipment automatic improving system, the effective application problem that solves electronic switch under high-risk environment is significant to the transformation of oil drilling and extracting equipment digital intelligent.There is on the market at present two kinds of explosion-proof type pressure (liquid level) switch, but all there is critical defect in its structure: a kind of blast resistance construction is flame-proof type: in order structurally to meet requirement of explosion proof, all be arranged on " explosion-proof chamber " measuring sensitive element together with circuit, measure the pressure-sensitive face of sensitive element substantially in sealing or partial vacuum state, therefore just there is the errors of principles in this electronic switch (being less than or equal to atmospheric pressure) when measuring little pressure, but 2-3 times of its error maximum deviation theory value, in fact this instrument has lost real use value; Another kind of blast resistance construction is " intrinsic safety type ", although there is not measurement principle error in this structure, must buy in addition special-purpose " safety barrier " supporting with it, otherwise can not reach the technical standard of explosion-proof electric apparatus.The defect that said two products exists, greatly restricted the actual of Explosion-proof electronic switch and applied, and therefore is necessary to improve.
The utility model content
The technical matters that the utility model solves: a kind of compound explosion-prevention electronic switch is provided, structurally be designed to " explosion-proof chamber " and " intrinsic safety chamber " that be integrally connected and mutually isolate, install in addition breather component additional and be communicated with " intrinsic safety chamber " on jointing, not only can be effectively explosion-proof, and can eliminate measurement principle error, provide technique guarantee for improving the electronic switch precision.
The technical solution adopted in the utility model: compound explosion-prevention electronic switch, there is casing, described casing by horizontal cavity and vertically cavity form and UNICOM between the two, two ends, described horizontal cavity left and right are tightly connected with left end cap and right end cap respectively, the front and back end of horizontal cavity respectively with plug and the cable sealed joint formation explosion-proof chamber that is tightly connected, described vertical cavity one end is connected with explosion-proof chamber by safety barrier, vertically the cavity other end is tightly connected and forms the intrinsic safety chamber with jointing with holes, wherein on jointing, be provided with breather component and be communicated with the intrinsic safety chamber, the piezoelectricity core body is arranged on the interior pressure ring I sealing compression of also using of cavity I in intrinsic safety chamber, the metal extension line of described piezoelectricity core body connects safety barrier one end through the pressure ring II in the cavity II that is arranged on the intrinsic safety chamber, the described safety barrier other end is connected with display circuit board with the main circuit board in being arranged on explosion-proof chamber.
Wherein, described breather component comprises housing of respirator and powder metallurgy rod, be shaped with spiracle and hole on described housing of respirator, described powder metallurgy rod is included in hole, described housing of respirator one end screw-in jointing is communicated with the intrinsic safety chamber and compresses with housing screw, and the housing of respirator other end is in communication with the outside by spiracle.
Further, described left end cap, right end cap, plug, cable sealed joint and jointing all are connected with casing sealing by screw thread, and threaded flameproof joint is screwed into the degree of depth and is not less than 8mm, and the joggle number is no less than 5 buttons.
Further, on described pressure ring I and pressure ring II excircle, all be shaped with external thread and respectively with the intrinsic safety chamber in the cavity I and cavity II internal face on the internal thread that is shaped with screw and be tightly connected.
Further, described safety barrier is placed in explosion-proof chamber and becomes independently circuit board by the epoxide-resin glue encapsulation.
Further, described powder metallurgy rod is stainless steel powder metallurgical rod core, and its volumetric porosity is 30%-40%, aperture 10-30 μ m.
Further, be provided with the saturating window of glass in described left end cap, the saturating window of described glass is placed in display circuit board the place ahead.
The utility model compared with prior art efficiently solves the large problem of measurement principle error that single flame-proof type electronic switch produces when meeting explosion-resistance characteristic, having solved again intrinsic safety type needs the structure that the configuration safety barrier brings in addition to disturb contradiction, successfully realize the comprehensive explosion-resistance characteristic of electronic switch, there is very high practical value.
The accompanying drawing explanation
Fig. 1 is the utility model structural representation;
The A-A cut-open view that Fig. 2 is Fig. 1.
Embodiment
Below in conjunction with accompanying drawing 1-2, a kind of embodiment of the present utility model is described.
The compound explosion-prevention electronic switch, there is casing 2, described casing 2 by horizontal cavity and vertically cavity form and UNICOM between the two, two ends, described horizontal cavity left and right are tightly connected with left end cap 1 and right end cap 3 respectively, the front and back end of horizontal cavity is tightly connected and forms explosion-proof chamber 16 with plug 14 and cable sealed joint 15 respectively, described vertical cavity one end is connected with explosion-proof chamber 16 by safety barrier 6, vertically the cavity other end is tightly connected and forms intrinsic safety chamber 17 with jointing with holes 11, wherein on jointing 11, be provided with breather component and be communicated with intrinsic safety chamber 17, piezoelectricity core body 12 is arranged on the interior pressure ring I 13 sealing compressions of also using of cavity I 18 in intrinsic safety chamber 17, the metal extension line of described piezoelectricity core body 12 connects safety barrier 6 one ends through the pressure ring II 7 in the cavity II 19 that is arranged on intrinsic safety chamber 17, described safety barrier 6 other ends are connected with display circuit board 5 with the main circuit board 4 in being arranged on explosion-proof chamber 16.
Above-mentioned breather component comprises housing of respirator 8 and powder metallurgy rod 9, be shaped with spiracle 20 and hole 21 on described housing of respirator 8, described powder metallurgy rod 9 is included in hole 21, described housing of respirator 8 one ends screw in jointing 11 and are communicated with intrinsic safety chamber 17 and use housing screw 10 to compress, and housing of respirator 8 other ends are in communication with the outside by spiracle 20.Above-mentioned left end cap 1, right end cap 3, plug 14, cable sealed joint 15 and jointing 11 all are tightly connected by screw thread and casing 2, and threaded flameproof joint is screwed into the degree of depth and is not less than 8mm, and the joggle number is no less than 5 buttons; On above-mentioned pressure ring I 13 and pressure ring II 7 excircles, all be shaped with external thread and respectively with intrinsic safety chamber 17 in cavity I 18 and cavity II 19 internal faces on the internal thread that is shaped with screw and be tightly connected; Above-mentioned safety barrier 6 is placed in explosion-proof chamber 16 and becomes independently circuit board by the epoxide-resin glue encapsulation, safety barrier 6 elements are arranged in explosion-proof chamber 16, independently become a circuit board, use the epoxide-resin glue encapsulation, the input and output voltage between semiconductor pressure drag component and main circuit board 4 is protected; Described powder metallurgy rod 9 is stainless steel powder metallurgical rod core, and its volumetric porosity is 30%-40%, aperture 10-30 μ m; Be provided with the saturating window 22 of glass in described left end cap 1, the saturating window 22 of described glass is placed in display circuit board 5 the place aheads.
Principle of work: the processing that the through hole of the pressure of measured medium on jointing 11 passes through safety barrier 6 and main circuit board 4, display circuit board 5 again by piezoelectricity core body 12 is transformed into electric signal, realizes the purpose of the high point of measured pressure medium/liquid level and low point control.Explosion-proof chamber 16 is comprised of left end cap 1, casing 2, right end cap 3, cable sealed joint 15 and plug 14.The interior installation main circuit board 4 of explosion-proof chamber 16, safety barrier 6, display circuit board 5, its design is carried out by the requirement of GB3836.1-2010 " Electric Equipment in Explosive Gas Atmosphere part 1: General Requirement " and GB3836.2-2010 " Electric Equipment in Explosive Gas Atmosphere part 2: flame-proof type " d " ".Safety barrier 6 is to utilize the current limiting pressure-limiting circuit, has limited the energy that is delivered to hazardous area from harbor; Intrinsic safety equipment in hazardous area can work under such energy, but such energy shortage even intrinsic safety equipment self breaks down, can not produce any electric spark that is enough to ignite or heating surface with the explosion environment that ignites yet.Therefore, no matter be the pulpit equipment of harbor or the intrinsic safety device fails of hazardous area, as long as the normal operation of the current limiting pressure-limiting circuit of safety barrier 6, whole system all can be in a safe condition, can not produce blast.
Above-described embodiment, be preferred embodiment of the present utility model, not is used for limiting the utility model practical range, and the equivalence of being done with the described content of the utility model claim therefore all changes, within all should being included in the utility model claim scope.
Claims (7)
1. compound explosion-prevention electronic switch, there is casing (2), it is characterized in that: described casing (2) by horizontal cavity and vertically cavity form and UNICOM between the two, two ends, described horizontal cavity left and right are tightly connected with left end cap (1) and right end cap (3) respectively, the front and back end of horizontal cavity is tightly connected and forms explosion-proof chamber (16) with plug (14) and cable sealed joint (15) respectively, described vertical cavity one end is connected with explosion-proof chamber (16) by safety barrier (6), vertical jointing with holes (11) the formation intrinsic safety chamber (17) that the is tightly connected cavity other end for, wherein on jointing (11), be provided with breather component and be communicated with intrinsic safety chamber (17), piezoelectricity core body (12) is arranged on interior pressure ring I (13) the sealing compression of also using of cavity I (18) in intrinsic safety chamber (17), the metal extension line of described piezoelectricity core body (12) connects safety barrier (6) one ends through the pressure ring II (7) in the cavity II (19) that is arranged on intrinsic safety chamber (17), described safety barrier (6) other end is connected with display circuit board (5) with the main circuit board (4) in being arranged on explosion-proof chamber (16).
2. compound explosion-prevention electronic switch according to claim 1, it is characterized in that: described breather component comprises housing of respirator (8) and powder metallurgy rod (9), be shaped with spiracle (20) and hole (21) on described housing of respirator (8), described powder metallurgy rod (9) is included in hole (21), described housing of respirator (8) one ends screw in jointing (11) and are communicated with intrinsic safety chamber (17) and use housing screw (10) to compress, and housing of respirator (8) other end is in communication with the outside by spiracle (20).
3. compound explosion-prevention electronic switch according to claim 1 and 2, it is characterized in that: described left end cap (1), right end cap (3), plug (14), cable sealed joint (15) and jointing (11) all are tightly connected by screw thread and casing (2), and threaded flameproof joint is screwed into the degree of depth and is not less than 8mm, the joggle number is no less than 5 buttons.
4. compound explosion-prevention electronic switch according to claim 3 is characterized in that: on described pressure ring I (13) and pressure ring II (7) excircle, all be shaped with external thread and respectively with intrinsic safety chamber (17) in cavity I (18) and cavity II (19) internal face on the internal thread that is shaped with screw and be tightly connected.
5. compound explosion-prevention electronic switch according to claim 4 is characterized in that: described safety barrier (6) is placed in explosion-proof chamber (16) and becomes independently circuit board by the epoxide-resin glue encapsulation.
6. compound explosion-prevention electronic switch according to claim 5 is characterized in that: described powder metallurgy rod (9) is stainless steel powder metallurgical rod core, and its volumetric porosity is 30%-40%, aperture 10-30 μ m.
7. compound explosion-prevention electronic switch according to claim 6, it is characterized in that: be provided with the saturating window of glass (22) in described left end cap (1), the saturating window of described glass (22) is placed in display circuit board (5) the place ahead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204673213U CN203324745U (en) | 2013-08-01 | 2013-08-01 | Compound explosion-proof electronic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204673213U CN203324745U (en) | 2013-08-01 | 2013-08-01 | Compound explosion-proof electronic switch |
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| Publication Number | Publication Date |
|---|---|
| CN203324745U true CN203324745U (en) | 2013-12-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204673213U Expired - Fee Related CN203324745U (en) | 2013-08-01 | 2013-08-01 | Compound explosion-proof electronic switch |
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| CN (1) | CN203324745U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616038A (en) * | 2013-12-19 | 2014-03-05 | 无锡格林通安全装备有限公司 | Anti-explosion sensor module |
| CN110109378A (en) * | 2018-02-01 | 2019-08-09 | 深圳市海洋王照明工程有限公司 | A kind of flame-proof switch power circuit and explosion-proof electrical source control cabinet |
-
2013
- 2013-08-01 CN CN2013204673213U patent/CN203324745U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616038A (en) * | 2013-12-19 | 2014-03-05 | 无锡格林通安全装备有限公司 | Anti-explosion sensor module |
| CN103616038B (en) * | 2013-12-19 | 2015-11-11 | 无锡格林通安全装备有限公司 | A kind of anti-explosion sensor module |
| CN110109378A (en) * | 2018-02-01 | 2019-08-09 | 深圳市海洋王照明工程有限公司 | A kind of flame-proof switch power circuit and explosion-proof electrical source control cabinet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20140801 |
|
| EXPY | Termination of patent right or utility model |