JP2018049015A - Flameproof electrical feed-through - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flameproof feed-through.SOLUTION: A flameproof feed-through 200 includes a feed-through element 210 comprising a substantially planar shape, a first interface region 211, and a second interface region 212, where one or more conductors 217 extend between the first interface region 211 and the second interface region 212. The flameproof feed-through 200 further includes one or more body portions 220A, 220B attached to the feed-through element 210, with the one or more body portions 220A, 220B holding the feed-through element 210 with respect to an aperture.SELECTED DRAWING: Figure 4

Description

  The present invention relates to flameproof feedthroughs, and more particularly to flameproof feedthroughs that provide impedance control.

  Vibratory conduit sensors, such as Coriolis mass flow meters (flow meters) and vibratory densitometers, generally operate by detecting the motion of an oscillating conduit containing a flowing material. Yes. Physical properties relating to the material in the conduit, such as mass flow, density, etc., can be determined by processing measurement signals received from motion transducers connected to the conduit. The vibration mode of a vibration system filled with a substance is generally affected by a combination of the containing conduit and the mass, stiffness and damping characteristics of the substance contained in the conduit.

  A typical Coriolis mass flow meter is connected in-line to a piping or other transfer system and has one or more conduits that transfer substances such as fluids, slurries, emulsions, etc. in the system. . Each conduit can be considered to have a set of unique vibration modes including, for example, a simple bending mode, a torsion mode, a radial mode, and a coupling mode. In a typical application of Coriolis mass flow measurement, when a substance is flowing through a conduit, the conduit is excited in one or more vibration modes, and the movement of the conduit is at multiple locations located at spaced intervals of the conduit. Measured. The excitation is usually applied by an actuator such as an electromechanical device such as a voice coil type driver that periodically perturbs the conduit. The mass flow rate can be obtained by measuring a delay time or a phase difference between vibrations at a plurality of transducer installation positions. Two such transducers (or pick-off sensors) are typically used to measure the vibration response of one or more flow conduits and are typically placed upstream and downstream of the actuator. These two pickoff sensors are connected to an electronic instrumentation device. The electronic instrumentation device receives signals from the two pickoff sensors and processes these signals to calculate, for example, mass flow measurements. Accordingly, vibration flow meters including Coriolis mass flow meters and densitometers use one or more flow tubes that vibrate to measure fluid.

Depending on the environment, it may be necessary to transmit electrical signals through a flame barrier physical barrier. For example, the flame proof physical barrier may be adapted to isolate a compartment of the transmitter housing that attaches to the field. For process control transmitters designed to be used in hazardous environments, a combination of multiple protection methods using flameproof housings and / or barriers to avoid uncontrolled explosions of flammable gases Is often used. International regulations provide compliance requirements for flameproof devices and structures.
In the case of a Coriolis flow meter transmitter, the active electronics components are placed in a flameproof compartment so that no explosive gas explosion caused by electrical energy in the electrical equipment can propagate across the enclosure. Is well known. In addition, user-accessible electronic equipment connection facilities are not flame proof as a protection method and prove that the connection equipment does not generate sparks and therefore does not ignite flammable gases. Sometimes it is preferred to take "safety". In any case, active electronic equipment that may cause a fire should be enclosed in a compartment that is not allowed to propagate from within the compartment in any fire. It has become.

  A flameproof feedthrough is used to electrically connect the two compartments. A typical conventional flameproof feedthrough is a cemented joint bushing. In cemented joint bushing, a cemented joint may be formed between the conductor and the bushing case, or the cemented joint may be formed between the conductor insulation coating and the bushing case. May be formed between the two. Non-cemented joints use a low-tolerance interface between the bushing case and the compartment wall, including threaded bushing cases, spigot bushing cases, and joint interfaces to other bushing cases. Also good. In order to be approved as flameproof, both types of joints must meet certain requirements. Specific requirements include, for example, temperature index rating and chemical compatibility, extremely tight tolerances (eg, on the order of about 0.1 or 0.15 millimeters), thread count and Depth, tolerance on a threaded joint, etc. are included.

  FIG. 2 shows a conventional spigot-type feed-through. Wires, pins or other conductors are formed in the feedthrough body and penetrate the feedthrough body. The peripheral surface of the spigot type feedthrough body substantially contacts with the inner surface of the opening to form a so-called spigot joint (spigot joint). Between the outer surface of the feedthrough body and the inner surface of the opening is a gap and thus a flame path. A spin-got type feedthrough body must achieve a gap that is unacceptably large and a minimal gap that does not have an unacceptably short flame path.

The spin-got type feedthrough body may be composed of a potting material such as plastic. The pottery material is formed, for example, in the shape of an opening, hardened or hardened, and is mounted in the opening as a spingot joint feedthrough.
FIG. 3 shows a conventional flange type feedthrough. The flange-type feedthrough main body is arranged so as to cover the opening so as to close the opening. The flange-type feedthrough body is larger than the opening and overlaps the opening. The gap and flame path are radial paths that extend outward from the axis between the flange-type feedthrough body and the outer surface of the other structure including the barrier, housing or opening.

All these approaches share certain drawbacks. First, the presence of individual conductors limits the ability to control electrical connection characteristic impedance. As a result, the signal frequency that can be effectively carried by the electrical connection is limited by the impedance of the conventional feedthrough. Second, the method of manufacturing the feedthrough requires the application and hardening of cement to form a physical barrier around the individual conductors or a plastic over-molding process.
process). These steps increase the manufacturing time, complexity and cost of manufacturing acceptable conventional flameproof feedthroughs.

In one aspect of the present invention, a flameproof feedthrough configured for use in an opening has a generally planar shape, a first interface region, and a second interface region. One or more conductors extending between the first interface region and the second interface region, a feedthrough element, attached to the feedthrough element and opening the feedthrough element One or more body portions that are held in place with respect to the first interface region of the feedthrough element at least partially extending to the first side of the flameproof feedthrough. The second interface region of the feedthrough element extends at least partially to the second side of the flameproof feedthrough ing.

Preferably, the feedthrough element is a printed circuit board (PCB).
Preferably, the one or more conductors are one or more inner or outer conductors.
Preferably, the feedthrough element provides a predetermined impedance characteristic to the one or more conductors.
Preferably, the feedthrough element is machined to a predetermined profile tolerance.
Preferably, the one or more body parts are two or more body parts and are machined such that the feedthrough end of the feedthrough element is substantially flush with the circumferential surface of the two or more body parts. The
Preferably, the one or more body parts are two or more body parts sandwiching a feedthrough element to form a spigot type joint, the circumferential surface of the two or more body parts and the feed The feedthrough end of the through element is machined to a predetermined perimeter size and shape to form a substantially flameproof interface between the feedthrough element and the opening.

Preferably, the one or more body parts are two or more body parts sandwiching the feedthrough elements to form a spigot type joint, the peripheral surfaces of the two or more body parts and the feedthrough element feed The through end is machined to a predetermined perimeter size and shape to form a substantially flameproof interface between the feedthrough element and the opening, and the feedthrough element is connected to the feedthrough element Machined to predetermined profile tolerances to form a substantially flameproof interface between two or more body portions.
Preferably, the one or more body portions are a single body portion, and the feedthrough element is
Machined to a predetermined profile tolerance to form a substantially flameproof flange-type interface between the single body portion, the feedthrough element, and the surface surrounding the opening.

  In one aspect of the invention, a method of forming a flameproof feedthrough adapted to be used in an opening includes a feed having a generally planar shape, a first interface region, and a second interface region. Providing a through element, wherein one or more conductors extend between the first interface region and the second interface region, and providing the feed through element; Attaching one or more body portions to the feedthrough element to hold in place relative to the feedthrough element, wherein the first interface region of the feedthrough element is at least on the first side of the flameproof feedthrough Partially extending, the second interface region of the feedthrough element is less on the second side of the flameproof feedthrough. Kutomo partially extends.

Preferably, the feedthrough element is a printed circuit board (PCB).
Preferably, the one or more conductors are one or more inner or outer conductors.
Preferably, the feedthrough element provides a predetermined impedance characteristic to the one or more conductors.
Preferably, the method further includes machining the feedthrough element to a predetermined profile tolerance.
Preferably, the one or more body portions are two or more body portions, and the feedthrough end of the feedthrough element is machined so as to be substantially flush with the peripheral surfaces of the two or more body portions.

Preferably, the one or more body portions are two or more body portions, and the mounting described above causes the feedthrough elements to be sandwiched between the two or more body portions to form a spigot type joint; Feed of two or more body portions and feedthrough elements to a predetermined perimeter size and shape to form a substantially flameproof interface between the flameproof feedthrough and the opening Machining the through end.
Preferably, the one or more body portions are two or more body portions, and the attachment described above forms a substantially flameproof interface between the feedthrough element and the two or more body portions. Machining the feedthrough element to a predetermined profile tolerance, sandwiching the feedthrough element between two or more body parts to form a spigot type joint, and Machining the peripheral surface of two or more body portions and the feedthrough end of the feedthrough element to a predetermined perimeter size and shape to form a substantially flameproof interface with the opening Including.
Preferably, the one or more body parts are a single body part, such a method comprising a substantially flameproof flange between the single body part, the feedthrough element and the surface surrounding the opening. The method further includes machining the feedthrough element to a predetermined profile tolerance to form a type interface.

The same reference number represents the same part on all drawings. The scale of the drawings is not necessarily uniform.
It is a figure which shows the vibration type flow meter concerning a certain embodiment of this invention. It is a figure which shows the conventional spigot type feedthrough. It is a figure which shows the conventional flange type feedthrough. It is an exploded view showing a flameproof feedthrough according to an embodiment of the present invention. It is a figure which shows the flame-proof feedthrough located in the opening concerning one embodiment of this invention. It is an exploded view showing a flameproof feedthrough according to another embodiment of the present invention. FIG. 7 shows a first body portion and a second body portion attached to the feedthrough element of FIG. 6. It is a figure which shows the flame-proof feedthrough concerning other embodiment of this invention.

3-8 and the following description depict specific embodiments to teach those skilled in the art how to make and use the invention in its best mode. In order to teach the principles of the invention, some of the prior art may be simplified or omitted. As will be apparent to those skilled in the art, variations on these embodiments are also within the scope of the present invention. It will also be apparent to those skilled in the art that the components described below can be combined in various ways to form multiple variations of the invention. Accordingly, the invention is not limited to the specific embodiments described below, but only by the claims and their equivalents.

  FIG. 1 shows a vibratory flow meter 5 according to the present invention. The vibration type flow meter 5 includes a flow meter assembly 10 and meter electronic equipment 20. Meter electronics 20 is connected to meter assembly 10 via lead 100 and is one or more measurements of density, mass flow, volume flow, total mass flow, temperature, and other measurements or information. Is provided via the communication path 26. As will be apparent to those skilled in the art, the vibratory flow meter 5 may be any vibratory flow meter regardless of the number of drivers, pickoff sensors, flow conduits or operating vibration modes. In some embodiments, the vibratory flow meter 5 may be a Coriolis mass flow meter. In addition to or instead of this, it goes without saying that the vibration type flow meter 5 may be a vibration type densitometer.

The flow meter assembly 10 includes a pair of flanges 101, 101b, manifolds 102, 102b, a driver 104, pick-off sensors 105, 105b, and flow conduits 103A, 103B. Driver 104 and pickoff sensors 105, 105b are connected to flow conduits 103A, 103B.
The flanges 101a and 101b are fixed to the manifolds 102a and 102b. In some embodiments, the manifolds 102, 102 b may be fixed at both ends of the spacer 106. The spacer 106 maintains a distance between the manifold 102 and the manifold 102b so that the piping force is not transmitted to the flow conduits 103A and 103B. When the flow meter assembly 10 is inserted into a pipe (not shown) that carries the fluid to be measured, the fluid flows through the flange 10 into the flow meter assembly 10 and enters the inlet manifold 102a. , The total amount of flowing fluid flows into the flow conduits 103A, 103B, flows through the flow conduits 103A, 103B, enters the outlet manifold 102b, and flows out of the meter assembly 10 from the flange 101b.

The flowing fluid may be a liquid. The flowing fluid may be a gas. The flowing fluid may be a multiphase fluid such as a liquid containing entrained gas and / or entrained solids.
The flow conduits 103A, 103B are selected to have substantially the same mass distribution, moment of inertia, and elasticity module relative to the bending axes Wa-Wa, Wb-Wb, respectively, and the inlet manifold 102a and the outlet manifold 102b It is attached properly. The flow conduits 103A and 103B extend substantially in parallel from the manifolds 102a and 102b toward the outside.
The flow conduits 103A, 103B are caused to vibrate by the driver 104 about opposite bending axes Wa, Wb, respectively, and in the so-called first antiphase bending mode of the vibratory flow meter 5, in opposite directions. The driver 104 may have one of a plurality of known configurations, such as a configuration in which a magnet is attached to the flow conduit 103A and a coil paired therewith is attached to the flow conduit 103B. An alternating current is passed through this opposing coil to vibrate both conduits. An appropriate drive signal is applied to the driver 104 via the lead 110 by the meter electronics 20. Other driver devices are contemplated and are also within the specification and claims.

The meter electronic device 20 receives sensor signals from the lead wire 111 and the lead wire 111b, respectively. Meter electronics 20 generates a drive signal on lead 110, which causes driver 104 to vibrate flow conduits 103A, 103B. Other sensor devices are also contemplated and are also within the scope of the specification and claims.
The meter electronics 20 processes the left and right speed signals from the pickoff sensors 105, 105b and calculates, for example, the flow rate. Communication path 26 provides input and output means that allow meter electronics 20 to communicate with an operator or other electronic device. The description of FIG. 1 provides only an example of the operation of a Coriolis flow meter and is not intended to limit the teaching of the present invention.
In one embodiment, meter electronics 20 is configured to vibrate flow tubes 103A, 103B. The vibration is performed by the driver 104. Further, the meter electronic device 20 further receives vibration signals obtained from the pick-off sensors 105a and 105b. These vibration signals are response vibrations of the flow tubes 103A and 103B. The meter electronics 20 processes these response vibrations to determine the response frequency and / or phase difference. The meter electronics 20 also processes response vibrations to determine measurements related to one or more flows including the mass flow rate and / or density of the flowing fluid. Other response vibration characteristics and / or flow measurements are also contemplated and are also included in the specification and claims.

In one embodiment, the flow tubes 103A, 103B may be substantially U-shaped flow tubes as shown. Alternatively, in other embodiments, the flow tubes 103A, 103B may be a substantially straight flow tube or one or more curved flow tubes other than a U-shaped flow tube. Also good. Additional flow meter shapes and / or configurations may be used and are also included in the specification and claims.
FIG. 4 is an exploded view of a flameproof feedthrough 200 according to an embodiment of the present invention. The flameproof feedthrough 200 according to the present embodiment includes a feedthrough element 210 having a substantially planar shape, a first interface region 211, and a second interface region 212. One or more conductors 217 extend between the interface region 211 and the second interface region 212. The flameproof feedthrough 200 further comprises one or more body portions 220 that are attached to the feedthrough element 210. One or more body portions 220 are adapted to hold the feedthrough element 210 in place with respect to the opening. The first interface region 211 of the feedthrough element 210 extends at least partially to the first side 201 of the flameproof feedthrough 200. The second interface region 212 of the feedthrough element 210 extends at least partially to the second side 202 of the flameproof feedthrough 200.

In the illustrated embodiment, two or more body portions 220 are used, for example, a first body portion 220A and a second body portion 220B. Alternatively, in other embodiments, a single body portion 220 may be used. In still other embodiments, more than two body portions 220 may be assembled to form a flameproof feedthrough 200.
When the flameproof feedthrough 200 according to this embodiment is assembled, the feedthrough element 210 is sandwiched between the first body portion 220A and the second body portion 220B. When assembled, the first body portion 220A, the feedthrough element 210, and the second body portion 220B are substantially protected between the feedthrough element 210 and each of the first body portion 220A and the second body portion 220B. A flammable interface is formed. The first body portion 220A and the second body portion 220B are configured to be fitted into the opening to substantially close the opening (see, for example, FIG. 5).

The opening may be an opening provided in a barrier, wall or other partition. Alternatively, the opening may be an opening provided in the shell, chamber, or housing. The opening may also require the use of feedthroughs that transmit power and / or electrical signals between the two side surfaces or between the chamber and the outside of the chamber.
In some embodiments, the feedthrough element 210 may have a generally planar shape. The feedthrough element 210 has a generally flat or planar surface that is clamped by the first body portion 220A and the second body portion 220B. However, the feedthrough element 210 may be formed in any desired or necessary shape. The feedthrough element 210 has a first interface area 211 and a second interface area 212. In some embodiments, the second interface region 212 may be located substantially opposite the first interface region 211. However, this is not a requirement and the second interface area 212 may be in any position / orientation relative to the first interface area 211.

The feedthrough element 210 has one or more conductors 217 that extend from the first interface region 211 to the second interface region 212. The one or more conductors 217 may be outer conductors that are formed on the outer surface of the feedthrough element 210. Alternatively, the one or more conductors 217 may be inner conductors that are partially or fully formed within the feedthrough element 210. One or more conductors 217 may be adapted to transmit electrical and / or electrical signals between the first interface region 211 and the second interface region 212.
The feedthrough element 210 may be an electrically insulating material. The feedthrough element 210 may be a non-flammable material, a flameproof material, or a heat resistant material. In some embodiments, the feedthrough element 210 may be a printed circuit board (PCB). The one or more conductors 217 may be formed on the outer surface of the feedthrough element 210 or may be partially or fully provided within the feedthrough element 210.

  When the illustrated feedthrough element 210 is secured between the first body portion 220A and the second body portion 220B, the first interface region 211 is at least partially from the first side 201. The second interface region 212 extends at least partially from the second side 202 (see FIG. 5). Accordingly, the ends of one or more conductors 217 in the first interface region 211 are exposed to be electrically contacted or coupled. Similarly, the ends of one or more conductors 217 in the second interface region 212 are similarly exposed to be electrically contacted or coupled. A first electrical connector (or similar device) may be attached to or secured to the first interface region 211 and its conductors. A second electrical connector (or similar device) may be attached to or secured to the second interface region 212 and its conductors.

When the first body portion 220A, the feedthrough element 210 and the second body portion 220B are assembled and the feedthrough element 210 is sandwiched by the first body portion 220A and the second body portion 220B, the feedthrough element A substantially flameproof interface is formed between 210 and each of first body portion 220A and second body portion 220B. When the flameproof feedthrough 200 is assembled, a potential flame path is formed on either side of the feedthrough element 210. The potential flame path is the contact surfaces 231A, 231B of the first body portion 220A and the second body portion 220B (ie, the first body portion 220A and the second body portion 220B are in contact with the feedthrough element 210). The flame path length is equal to the thickness of the surface. It is important to minimize the gap between each of the two contact surfaces 231A, 231B and the feedthrough element 210. The flame path between the feedthrough element 210 and the body portion 220 depends on both the gap size and the flame path length. According to the flameproof standard, it is necessary to keep the gap small, the flame path length long, or both.
If the gap between the feedthrough element 210 and each of the first body portion 220A and the second body portion 220B is less than a predetermined gap tolerance, the flame path length is sufficient to contain the heat to cause ignition. A flame having an amount or energy content may be selected such that it does not propagate from one side of the flameproof feedthrough 200 to the other.

The fit between each of body portion 220A and body portion 220B and feedthrough element 210 is very important. Desirably no gap exists. The gap allows gas to leak and can cause gas ignition. The gap may allow ignition products to propagate through the junction. Thus, the feedthrough element 210 and the contact surfaces 231A, 231B are very smooth and uniform, i.e. meet certain surface finish requirements.
In addition, it may be important that the outer surface 232 of the body portion 220 fits into the opening. It is highly desirable that the gap between the body portion 220 and the inner surface of the opening achieve one or both of a minimum gap and an appropriate flame path length.
In some embodiments of the assembly method, one or more body portions 220 may be attached to the feedthrough element 210 to form a spigot type joint. The assembled flame-proof feedthrough 200 is then planed, milled, grindered, etched and turned so that its peripheral surface achieves a predetermined gap with respect to the inner surface of the opening. Or otherwise processed. In other words, the outer surface of the assembled flameproof feedthrough 200 is treated to achieve a gap that is less than a predetermined gap tolerance for the opening.

In some embodiments of the assembly method, the peripheral surface 232 of one or more body portions 220 and the feedthrough end 216 of the feedthrough element 210 may be machined to a predetermined size. is there. The peripheral surfaces 232A, 232B of the two or more body portions 220A, 220B and the feedthrough end 216 of the feedthrough element 210 provide a substantially flameproof interface between the flameproof feedthrough 200 and the opening. May be machined to a predetermined size to form. The feedthrough end 216 of the feedthrough element 210 may be machined to be substantially flush with the peripheral surfaces 232A, 232B of the two or more body portions 220A, 220B.
In an assembly method according to some embodiments, the feedthrough element 210 may be machined to meet a predetermined profile (profile) tolerance. The predetermined profile tolerance may include a predetermined surface flatness. The predetermined profile tolerance may include a predetermined surface smoothness. For example, one or both of the feedthrough element 210 and the cross-opening flanges 230A, 230B (see FIG. 6) may achieve a substantially flameproof interface when assembled, ie, the body portion 220. And may be machined or otherwise machined to achieve a gap that is less than a predetermined allowable gap between the feedthrough element 210 and the feedthrough element 210. The machining may be performed to achieve an external surface tolerance and a minimum gap fit for the opening. The machining may further include machining the contact surfaces 231A, 231B of the two or more body portions 220A, 220B (see FIG. 4). If the one or more body portions 220 are a single body portion 220, the feedthrough element 210 is machined to a predetermined profile tolerance and substantially between the feedthrough element 210 and the face surrounding the opening. A flameproof flange type interface is formed.

Regardless of the method of assembly according to any embodiment, one or both of the body portion 220 and the feedthrough element 210 may achieve a predetermined surface smoothness and / or a gap less than a predetermined gap tolerance. It is only necessary to be machined to achieve the above. For example, the feedthrough element 210 and / or two or more body portions 220A, 220B are manufactured to be greater than the desired thickness, and then the assembled flameproof feedthrough 200 is converted to a flameproof feedthrough. It may be planed, milled, etched, polished, or otherwise processed until the 200 has the desired perimeter size and shape and the desired uniformity. The feedthrough element 210 and / or the two or more body portions 220A, 220B may be one of a predetermined peripheral size, a predetermined peripheral shape, a predetermined peripheral surface smoothness, and / or a predetermined peripheral surface uniformity. It may be machined to achieve the above.

  In addition to performing a flameproof sealing function, the feedthrough element 210 may further provide an electrical interface that provides a predetermined impedance characteristic to the one or more conductors 217. Needless to say, the impedance characteristics of the individual conductors 217 may be the same or different. One or more conductors 217 of feedthrough element 210 may be formed with high precision. One or more conductors 217 may be formed with a predetermined thickness and a predetermined width. The one or more conductors 217 may be formed in a predetermined geometric shape or pattern, and may include one or more ground plates. One or more conductors 217 may be formed from a predetermined conductor composition. Further, the one or more conductors 217 may be formed to have a predetermined DC resistance and / or a predetermined AC impedance. This can include having passive electrical components and / or active electrical components as part of feedthrough element 210 or as part of a subsequent electrical circuit. Further, in some embodiments, the flameproof feedthrough 200 may have a replaceable feedthrough element 210 having various impedances / resistances. Accordingly, the flameproof feedthrough 200 can be assembled to have a desired impedance / resistance from among a plurality of potential candidate impedances / resistances.

In some embodiments, the feedthrough element 210 may be at least partially bendable. In embodiments where the feedthrough element 210 is pliable, the feedthrough element 210 is configured to be sandwiched between the two body portions 220A, 220B, from the outer side 201 of the barrier and the inner side 202 of the barrier. May extend in any direction. For example, in some embodiments, the feedthrough element 210 is a flexible member similar to a ribbon cable.
In some embodiments, the flameproof feedthrough 200 may further include one or more seals (not shown) between the body portion 220 and the feedthrough element 210 and may also be flameproof. The sex feedthrough 200 may have one or more seals (not shown) between the body portion 220 and the inner surface of the opening.

The one or more seals may be one or more solid seals such as O-rings, gaskets, or other components that can be sandwiched between the components described above. Alternatively, the one or more seals are liquids, pastes, greases or other materials that do not have a predetermined shape and can be applied to one or more of the components of the flameproof feedthrough 200. May be. The one or more seals may be a material that does not substantially change. Alternatively, the one or more seals may be a material that hardens, cures, or otherwise changes, or a material that changes during or after the assembly process.
FIG. 5 shows a flameproof feedthrough 200 according to an embodiment of the present invention located within the opening. The flameproof feedthrough 200 according to this embodiment forms a spigot joint. The peripheral surface 232 of the flameproof feedthrough 200 is designed to fit the inner surface of the opening and the resulting gap is less than a predetermined gap threshold. The predetermined gap threshold, along with the flame path length, must meet the flameproof criteria.

The flameproof feedthrough 200 may have straight side surfaces or may have tapered side surfaces. The tapered flame-proof feedthrough 200 can create a greater resistance when removed—for example, a pressure differential exists between the first side 201 and the second side 202. This tapered feature also facilitates product assembly.
The flameproof feedthrough 200 also has a gap between the first body portion 220A and the feedthrough element 210 and a gap between the feedthrough element 210 and the second body portion 220B. ing.

As can be seen, the feedthrough element 210 passes through the flameproof feedthrough 200. The feedthrough element 210 protrudes on the first side 201 and the second side 202. As a result, the first interface region 211 of the feedthrough element 210 extends at least partially to the first side 201, and the second interface region 212 extends at least partially to the second side 202. ing.
FIG. 6 is an exploded view showing a flameproof feedthrough 200 according to another embodiment of the present invention. The flameproof feedthrough 200 according to the illustrated embodiment includes a feedthrough element 210, a first body portion 220A, and at least a second body portion 220B.
In this embodiment, the feedthrough element 210 may have one or more slots 215. One or more slots 215 may function to align a connector or other component.

In this embodiment, the feedthrough element 210 may have one or more fastener openings 218. As shown, one or more fastener openings 218 may be located in the second interface region 212. The one or more fastener openings 218 may be adapted to receive one or more corresponding fasteners 235 that couple the first body portion 220A and the second body portion 220B. Of course, the one or more fastener openings 218 may be arranged so as not to provide a short flame path that would avoid the entire length of the flame path along the feedthrough element 210.
In this embodiment, the feedthrough element 210 can have one or more first openings 213. One or more first openings 213 may be located in the first interface region 211. The one or more first openings 213 may be adapted to receive any electrical conductor or may be adapted to receive a connector or other component. One or more first openings 213 may have any pad, through-plating for conduction, or other functions for bonding conductors.

In this embodiment, the feedthrough element 210 may have one or more second openings 219 in the second interface region 212. The one or more second openings 219 may be adapted to receive any electrical conductor or may be adapted to receive a connector or other component. One or more second openings 219 may have any pad, through-plating for conduction, or other functions for bonding conductors. In some embodiments, one or more conductors 217 may extend between one or more first openings 213 and one or more second openings 219.
In this embodiment, the first body portion 220A and the second body portion 220B have mounting flanges 221A and 221B extending outward. The flanges 221A and 221B for attachment may be configured to be attached to a surface (or a plurality of surfaces) surrounding the opening. The mounting flanges 221A, 221B may be configured to prevent the first body portion 220A and the second body portion 220B from entering too much into or through the opening. The mounting flanges 221A and 221B may have one or more fastener openings 223 for mounting the mounting flanges 221A and 221B to the opening surface portion. Any suitable fastener may be inserted into the one or more fastener openings 223.

In this embodiment, the first body portion 220A and the second body portion 220B may have opening flanges 229A, 229B that extend at least partially into the opening. Opening flanges 229A, 229B correspond to one or more side walls of the opening and may be adapted to fit. The opening flanges 229A and 229B substantially match the shape of the opening.
The peripheral flange 229 may have one or more fastener openings 228. Alternatively, the one or more openings 228 may be one or more alignment openings 228 for receiving one or more alignment nails 227.
The body portions 220A, 220B have cross-opening flanges 230A, 230B that are configured to be pressed against both sides of the feedthrough element 210. The cross opening flanges 230A and 230B extend substantially across the central portion of the opening. In some embodiments, the cross-opening flanges 230A, 230B may substantially bisect the opening, but it goes without saying that the cross-opening flanges 230A, 230B are arranged at any position within the opening. Also good.

The cross opening flanges 230A and 230B may have clearance fastener openings 240A and 240B, or may have engagement fastener openings 241A and 241B. Clearance fastener openings 240 may alternate with engaging fastener openings 241. In this case, the fastener 235 passes through the clearance fastener opening 240 in the one main body portion 220 and engages with the engagement fastener opening 241 in the other main body portion 220. In some embodiments, the engagement fastener opening 241 is a threaded opening and the fastener 235 is a threaded fastener.
The first body portion 220A and the second body portion 220B have face plates 226A, 226B that are configured to close across the barrier opening. The face plates 226A and 226B may extend between the opening flanges 229A and 229B and the cross opening flanges 230A and 230B.
The first body portion 220A and the second body portion 220B may have other alignment functions such as a function 263 or a fastener function. These features 263 may have recesses and / or protrusions that receive or cooperate with one or more components on the first side 201 of the flameproof feedthrough 200.

  When assembled, the feedthrough element 210 is sandwiched between the first body portion 220A and the second body portion 220B, and the feedthrough element 210 is protected from the assembled first interface region 211. Extending at least partially from the first side 201 of the flammable feedthrough 200 and extending at least partially from the second side 202 of the assembled flame proof feedthrough 200. Located in. A first electrical connector (or similar device) may be attached to or secured to the first interface region 211 and the conductors therein. A second electrical connector (or similar device) may be attached to or secured to the second interface region 212 and the conductors therein. The fastener 235 may pass through the clearance openings 240A and 240B, engage with the engagement fastener openings 241A and 241B, and tighten the first body portion 220A and the second body portion 220B. In addition, the fasteners 235 may ensure the alignment of each body portion even after machining operations.

As described above, the feedthrough element 210 is sandwiched between two or more body portions 220A, 220B, and then the assembled flameproof feedthrough 200 has a circumferential surface against the inner surface of the opening. It may be planed, milled, grindered, etched, turned, or otherwise processed to achieve a predetermined gap tolerance. Instead, as described above, one or both of the feedthrough element 210 and the cross-opening flanges 230A, 230B, when assembled, provide a substantially flameproof interface, ie, the body It may be machined to achieve a gap below the predetermined gap threshold between portion 220 and feedthrough element 210 and / or to achieve an outer surface tolerance and minimum gap for the opening. Regardless of the assembly method according to any embodiment, one or both of the body portion 220 and the feedthrough element 210 will be machined to achieve a gap below a predetermined gap threshold. It may be.

FIG. 7 shows a first body portion 220A and a second body portion 220B assembled to the feedthrough element 210 of FIG. As can be seen, there is no substantial gap or flame path between the feedthrough element 210 and the second cross opening flange 230B. The assembled flameproof feedthrough 200 is ready to be placed in the opening.
FIG. 8 shows a flameproof feedthrough 200 according to another embodiment of the present invention. The flameproof feedthrough 200 includes a body portion 220 and a feedthrough element 210. The flameproof feedthrough 200 according to this embodiment forms a flange joint. In the flameproof feedthrough 200 according to this embodiment, one or more body portions 220 are comprised of a single body portion 220. The feedthrough element 210 is machined to a predetermined profile tolerance and a substantially flameproof flange-type interface is formed between the feedthrough element 210 and the face surrounding the opening.
The body portion 220 may overlap the opening and be disposed on one side of the opening surface (shown on the first side 201 for illustrative purposes only). As described above, the body portion 220 may have any suitable thickness and may be formed from any suitable material. The body portion 220 is capable of maintaining structural integrity even when there is a high pressure difference between the first side 201 and the second side 202.

The main body portion 220 may have a shape that matches the shape of the opening. For example, when the opening is circular, the main body portion 220 is circular. In some embodiments, the shape of the body portion 220 matches the shape of the opening so that the body portion 220 maintains a substantially constant and uniform overlap of the openings. In some embodiments, the body portion 220 is designed to completely close the opening. Alternatively, the body portion 220 may be different in shape from the opening.
Similarly, the feedthrough element 210 also overlaps the opening. However, the overlap due to the feedthrough element 210 is not limited to the overlap with the overlap due to the main body portion 220. The feedthrough element 210 is sandwiched between the body portion 220 and the surface surrounding the opening, and the feedthrough element 210 provides a flameproof closure means for the opening by closing the opening. It has become.
The flameproof feedthrough 200 may include one or more fasteners 866 that secure the body portion 220 to a surface surrounding the opening. As shown, one or more fasteners 866 may be adapted to sandwich the feedthrough element 210 between the body portion 220 and the surface surrounding the opening. Accordingly, the body portion 220 and the feedthrough element 210 may have one or more corresponding openings that allow one or more fasteners 866 to engage a surface surrounding the opening.

As mentioned above, the feedthrough element 210 may have any suitable thickness and may be formed from any suitable material. As described above, the feedthrough element 210 may have one or more conductors 217. The feedthrough element 210 may have a shape that matches the shape of the opening. Alternatively, the feedthrough element 210 may differ from the opening in shape. However, the feedthrough element 210 overlaps the opening, completely overlaps the opening, and no part remains uncovered by the portion of the opening.
The feedthrough element 210 has a first interface region (or a plurality of first interface regions) 211 that extends at least partially from the body portion 220 on the first side 201. The first interface region 211 may have or be adapted to receive an electrical connector 860 or other suitable component.

The feedthrough element 210 has a second interface region 212 that resides in the opening and extends at least partially from the feedthrough element 210 on the second side 201. The second interface region 212 is accessible to the second side 202 of the flameproof feedthrough 200. The second interface region 212 may be configured to have or receive an electrical connector 862 or other suitable component.
If desired, the flameproof feedthrough 200 according to the present invention and the method according to the present invention may be embodied according to any of the embodiments described above to provide a plurality of advantages. The flameproof feedthrough 200 may be adapted to prevent the flame from passing through the opening. The flameproof feedthrough 200 may be adapted to provide a constant and / or predetermined electrical impedance. The flameproof feedthrough 200 may be a feedthrough with low tolerance or gap that can be manufactured economically and accurately.

  The above detailed description of the embodiments does not completely cover all embodiments considered by the inventor to be within the scope of the present invention. More precisely, as will be apparent to those skilled in the art, some of the components of the above-described embodiments may be combined or removed in various ways to create further embodiments, and Further embodiments are within the scope and teachings of the present invention. Also, as will be apparent to those skilled in the art, the above-described embodiments may be combined in whole or in part to create further embodiments that fall within the scope of the technology and teachings of the present invention. Accordingly, the scope of the invention is determined by the appended claims.

Claims (18)

A flameproof feedthrough (200) configured to be used in an opening,
A feedthrough element (210) having a substantially planar shape and having a first interface region (211) and a second interface region (212), wherein the first interface region (211) A feedthrough element (210), wherein one or more conductors (217) extend between the second interface region (212) and the second interface region (212);
One or more body portions (220) attached to the feedthrough element (210) and holding the feedthrough element (210) in position relative to the opening;
The first interface region (211) of the feedthrough element (210) extends at least partially to a first side (201) of the flameproof feedthrough (200), and the feedthrough element ( 210) the second interface region (212) of the flameproof feedthrough (200) extends at least partially to the second side (202) of the flameproof feedthrough (200). .   The flameproof feedthrough (200) of claim 1, wherein the feedthrough element (210) is a printed circuit board (PCB) (210).   The flameproof feedthrough (200) of claim 1, wherein the one or more conductors (217) are one or more inner or outer conductors (217).   The flameproof feedthrough (200) of claim 1, wherein the feedthrough element (210) is configured to provide a predetermined impedance characteristic to the one or more conductors (217).   The flameproof feedthrough (200) of claim 1, wherein the feedthrough element (210) is configured to be machined to a predetermined profile tolerance.   The one or more body portions (220) are two or more body portions (220A, 220B), and a feedthrough end (216) of the feedthrough element (210) is the two or more body portions (220A). 220B), the flame-proof feedthrough (200) of claim 1, machined to be substantially flush with the peripheral surface (232A, 232B) of the outer surface (220B).   The one or more body portions (220) are two or more body portions (220A, 220B) that sandwich the feedthrough element (210) to form a spigot type joint, the two or more A peripheral surface (232A 232B) of the body portion (220A, 220B) and a feedthrough end (216) of the feedthrough element (210) substantially between the feedthrough element (210) and the opening The flameproof feedthrough (200) of claim 1, wherein the flameproof feedthrough (200) is configured to be machined to a predetermined perimeter size and shape to form a flameproof interface. The one or more body portions (220) are two or more body portions (220A, 220B) that sandwich the feedthrough element (210) to form a spigot type joint, the two or more A peripheral surface (232A 232B) of the body portion (220A, 220B) and a feedthrough end (216) of the feedthrough element (210) substantially between the feedthrough element (210) and the opening Machined to a predetermined perimeter size and shape to form a flameproof interface, the feedthrough element (210) is connected to the feedthrough element (210) and the two or more body portions (22
0A, 220B), and configured to be machined to a predetermined profile tolerance to form a substantially flameproof interface. Through (200).   The one or more body portions (220) are a single body portion (220), and the feedthrough element (210) comprises the single body portion (220), the feedthrough element (210), and The flameproof feed of claim 1, machined to a predetermined profile tolerance so as to form a substantially flameproof flange-type interface with a surface surrounding the opening. Through (200). A method of forming a flameproof feedthrough adapted to be used in an opening, comprising:
Providing a feedthrough element having a generally planar shape, a first interface region, and a second interface region, wherein 1 is provided between the first interface region and the second interface region. Providing a feedthrough element in which two or more conductors are extended;
Attaching one or more body portions to the feedthrough element to hold the feedthrough element in position relative to the opening;
The first interface region of the feedthrough element extends at least partially to a first side of the flameproof feedthrough, and the second interface region of the feedthrough element is the flameproofer. Extending at least partially to a second side of the feedthrough.   The method of claim 10, wherein the feedthrough element is a printed circuit board (PCB).   The method of claim 10, wherein the one or more conductors are one or more inner or outer conductors.   The method of claim 10, wherein the feedthrough element provides a predetermined impedance characteristic to the one or more conductors.   The method of claim 10, further comprising machining the feedthrough element to a predetermined profile tolerance. The one or more body portions are two or more body portions, and the feedthrough end of the feedthrough element is machined to be substantially flush with a circumferential surface of the two or more body portions. The method of claim 10, further comprising a step.   The one or more body portions are two or more body portions and the attaching step includes sandwiching the feedthrough element in the one or more body portions to form a spigot type joint; The peripheral surfaces of the two or more body portions and the feedthrough to a predetermined perimeter size and shape to form a substantially flameproof interface between the flameproof feedthrough and the opening 11. The method of claim 10, further comprising machining the feedthrough end of the element. The one or more body portions are two or more body portions and the attaching step forms a substantially flameproof interface between the feedthrough element and the two or more body portions; Machining the feedthrough element to a predetermined profile tolerance; sandwiching the feedthrough element in the two or more body portions to form a spigot type joint; and The peripheral surface of the two or more body portions and the feedthrough end of the feedthrough element to a predetermined perimeter size and shape to form a substantially flameproof interface between the through element and the opening 11. The method of claim 10, comprising machining the part. The one or more body portions are a single body portion; and the method is substantially flame proof between the single body portion, the feedthrough element, and a surface surrounding the opening. The method of claim 10, further comprising machining the feedthrough element to a predetermined profile tolerance to form a flange type interface.

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