JP6752135B2 - Flameproof electric feedthrough - Google Patents

Description

The present invention relates to flameproof feedthrough, and in particular to flameproof feedthrough that provides impedance control.

Vibrating conduit sensors, such as the Koriori mass flow meter (flow meter) and the vibrating densitometer, are generally activated by detecting the motion of the vibrating conduit containing the fluid. There is. Physical properties related to substances in the conduit, such as mass flow rate and density, can be determined by processing the measurement signal received from the motion transducer connected to the conduit. The vibration mode of a material-filled vibration system is generally influenced by a combination of the contained conduit and the mass, stiffness and damping properties of the material contained in the conduit.

A typical mass flow meter is connected in-line to a pipe or other transfer system and has one or more conduits for transferring 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 twisting mode, a radial mode and a coupling mode. In a typical application of Koriori mass flow measurement, when a substance is flowing through a conduit, the conduit is excited in one or more modes of vibration and the movement of the conduit is at multiple sites spaced apart from the conduit. Be 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 determined by measuring the delay time or phase difference between vibrations at multiple 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 usually located upstream and downstream of the actuator. These two pick-off sensors are connected to an electronic instrumentation device. The electronic instrumentation device receives signals from two pick-off sensors and processes these signals to calculate, for example, a mass flow rate measurement. Therefore, oscillating flow meters, including Coriolis mass flow meters and densitometers, use one or more oscillating flow tubes to measure fluid.

In some environments, it may be necessary to transmit electrical signals through a flameproof physical barrier. For example, a flameproof physical barrier may be designed to separate the compartments of the transmitter housing to be installed in the field. For process controlled transmitters designed for use in hazardous environments, a combination of multiple protection methods with flameproof housings and / or barriers to avoid uncontrolled explosions of flammable gases. Is often used. International Covenants provide compliance requirements for flameproof devices and structures.
For Koriori flowmeter transmitters, the active electronics component must be placed in a flameproof compartment to prevent the possible gas explosion caused by the electrical energy in the electrical equipment from propagating beyond the enclosure. Is well known. In addition, user-accessible electronics connections are "enhanced" to prove that they are not flameproof as a protective method and that they do not ignite flammable gases because they do not generate sparks. Sometimes it is preferred to take "safety". Under either agreement, active electronics that may cause ignition should be enclosed in a compartment that prevents any ignition from propagating from within the compartment. It has become.

A flameproof feedthrough is used to electrically connect the two compartments. A typical flameproof feedthrough of the past is a cemented joint bushing. In cemented joint bushes, a cement-based joint may be formed between the conductor and the bush case, or a cement-based joint may be formed between the conductor's insulating coating and the bush case. It may be formed between and. Cement-free joints have come to use a low tolerance interface between the bush case and the wall of the compartment, including a joint interface to threaded bush cases, spigot bush cases and other bush cases. May be good. Both types of joints must meet specific requirements in order to be approved as flameproof. Specific requirements include, for example, temperature evaluation and chemical compatibility, extremely tight tolerances (eg, about 0.1 or 0.15 mm), thread count, and Depth, tolerance on a threaded joint, etc. are included.

FIG. 2 shows a conventional spigot-type fed-throw. Wires, pins or other conductors are formed within the feedthrough body and penetrate the feedthrough body. The peripheral surface of the spigot type feedthrough body is substantially in contact with the inner surface of the opening to form a so-called spigot joint (spigot joint). There is a gap, and thus a flame path, between the outer surface of the feedthrough body and the inner surface of the opening. Spingot-type feedthrough bodies must provide minimal gaps with unacceptably large gaps and unacceptably short flame paths.

The spin-got type feedthrough body may be made of a potting material such as plastic. The pottery material is formed, for example, in the shape of an opening, hardened or hardened, and installed in the opening as a spingot joint feedthrough.
FIG. 3 shows a conventional flange type feedthrough. The flange-type feedthrough 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 is designed to overlap the openings. The gaps and flame paths are radial paths that extend outward from the axis between the flange-type feedthrough body and the outer surface of other structures, including barriers, housings or openings.

All these approaches share some drawbacks. First, the presence of individual conductors limits the ability to control the 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 feedthroughs requires the application and hardening of cement to form a physical barrier around the individual conductors or the plastic over-molding process.
process) is required. These steps add manufacturing time, complexity and cost when manufacturing an acceptable conventional flameproof feedthrough.

In one aspect of the invention, the flameproof feedthrough configured to be used for an opening is a feedthrough element having a substantially planar shape and a first interface region and a second interface region. A feedthrough element in which one or more conductors extend between the first interface area and the second interface area, and a feedthrough element attached to the feedthrough element to open the feedthrough element. The first interface area of the feedthrough element extends at least partially to the first side of the flameproof feedthrough, with one or more body portions that hold it in place with respect to. , The second interface region of the feedthrough element extends at least partially to the second side of the flameproof feedthrough.

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 one or more conductors with a given impedance characteristic.
Preferably, the feedthrough element is machined to a predetermined profile tolerance.
Preferably, one or more body parts are two or more body parts and the feedthrough end of the feedthrough element is machined to be substantially flush with the peripheral surfaces of the two or more body parts. To.
Preferably, one or more body parts are two or more body parts that sandwich a feedthrough element to form a spigot-type joint, and the peripheral surface and feed of the two or more body parts. 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, one or more body parts are two or more body parts that sandwich the feedthrough element to form a spigot-type joint, and the peripheral surfaces of the two or more body parts and the feed of the feedthrough element. 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 with the feedthrough element. It is machined to a predetermined profile tolerance to form a substantially flameproof interface between the two or more body parts.
Preferably, one or more body parts are single body parts and the feedthrough element is
It 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, the method of forming a flameproof feedthrough adapted to be used for an opening is a feed having a substantially planar shape and a first interface region and a second interface region. A step of providing a feedthrough element, in which one or more conductors are extended between a first interface region and a second interface region, and a step of providing a feedthrough element and opening the feedthrough element. The first interface area of the feedthrough element is at least on the first side of the flameproof feedthrough, including the step of attaching one or more body parts to the feedthrough element to hold it in place with respect to Partially extended, the second interface region of the feedthrough element extends at least partially to the second side of the flameproof feedthrough.

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 one or more conductors with a given impedance characteristic.
Preferably, it further comprises the step of machining the feedthrough element to a predetermined profile tolerance.
Preferably, one or more main body portions are two or more main body portions, and the feedthrough end portion of the feedthrough element is machined so as to be substantially flush with the peripheral surface of the two or more main body portions.

Preferably, one or more body parts are two or more body parts, and the attachment described above causes the feedthrough elements to be sandwiched between the two or more body parts in order to form a spigot type joint. , Feed-through of two or more body parts and feed-through elements to form a substantially flame-retardant interface between the flame-retardant feedthrough and the opening to fit a given perimeter size and shape. Further includes machining the through end.
Preferably, one or more body parts are two or more body parts, and the attachment described above forms a substantially flameproof interface between the feedthrough element and the two or more body parts. To machine the feedthrough element to a given profile tolerance, to narrow the feedthrough element into two or more body parts to form a spigot type joint, and to use the feedthrough element. Machining the peripheral surfaces of two or more body parts and the feedthrough ends of feedthrough elements to a predetermined perimeter size and shape to form a substantially flameproof interface with the opening. And include.
Preferably, one or more body parts are a single body part, such a method is a substantially flameproof flange between the single body part and the feedthrough element and the surface surrounding the opening. It further includes machining feedthrough elements to a predetermined profile tolerance to form a type of interface.

The same reference number represents the same part on all drawings. The scale of the drawings is not always uniform.
It is a figure which shows the vibration type flow meter which concerns on an embodiment of this invention. It is a figure which shows the feedthrough of the conventional spigot type. It is a figure which shows the feedthrough of the conventional flange type. It is an exploded view which shows the flameproof feedthrough which concerns on an embodiment of this invention. It is a figure which shows the flameproof feedthrough located in the opening which concerns on an embodiment of this invention. FIG. 5 is an exploded view showing a flameproof feedthrough according to another embodiment of the present invention. It is a figure which shows the 1st main body part and the 2nd main body part attached to the feedthrough element of FIG. It is a figure which shows the flameproof feedthrough which concerns on other embodiment of this invention.

3-8 and the following description show specific embodiments for teaching one of ordinary skill in the art how to implement and utilize the present invention in the best mode. In order to teach the principles of the present invention, some of the prior art may be simplified or omitted. As will be apparent to those skilled in the art, variations of these embodiments are also included within the scope of the present invention. Also, as will be apparent to those skilled in the art, the components described below can be combined in various ways to form a plurality of variants of the invention. Therefore, the present invention is not limited to the specific embodiments described below, but only by the claims and their equivalents.

FIG. 1 shows a vibration type flow meter 5 according to the present invention. The vibrating flow meter 5 includes a flow meter assembly 10 and a meter electronic device 20. The meter electronic device 20 is connected to the meter assembly 10 via a lead wire 100 and is one or more of density, mass flow rate, volume flow rate, total mass flow rate, temperature, and other measurements or information. Is configured to be provided via the communication path 26. As will be apparent to those skilled in the art, the vibrating flow meter 5 may be any vibrating flow meter, regardless of the number of drivers, pick-off sensors, flow conduits or operating vibration modes. Depending on the embodiment, the vibration type flow meter 5 may be a Coriolis type mass flow meter. It goes without saying that the vibrating flow meter 5 may be a vibrating densitometer in addition to or instead of that.

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. The driver 104 and the pick-off sensors 105 and 105b are connected to the flow conduits 103A and 103B.
The flanges 101a and 101b are fixed to the manifolds 102a and 102b. Depending on the embodiment, the manifolds 102 and 102b may be fixed to both ends of the spacer 106. The spacer 106 is adapted to maintain a distance between the manifold 102 and the manifold 102b so that the force of the pipe is not transmitted to the flow conduits 103A, 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 the inflow inlet manifold 102a. The entire amount of the fluid flows into the flow conduits 103A and 103B, flows through the flow conduits 103A and 103B, flows into the outlet manifold 102b, and flows out of the flange 101b to the outside of the meter assembly 10.

The fluid fluid may be a liquid. The fluid fluid may be a gas. The fluid may be a polyphase fluid such as a liquid containing a mixed gas and / or a mixed solid.
The flow conduits 103A and 103B are selected to have substantially the same mass distribution, moment of inertia and elastic module with respect to the bending axes Wa-Wa and Wb-Wb, respectively, and the inlet manifold 102a and outlet manifold 102b. Can be properly attached to. The flow conduits 103A and 103B extend outward in substantially parallel from the manifolds 102a and 102b.
The flow conduits 103A and 103B are vibrated by the driver 104 in the opposite directions to each other in the so-called first anti-phase bending mode of the vibration type flow meter 5 centering on the corresponding bending axes Wa and Wb, respectively. The driver 104 may have one of a plurality of known configurations, such as a magnet attached to the flow conduit 103A and a coil paired thereto attached to the flow conduit 103B. Alternating current is passed through the opposing coils to vibrate both conduits. The meter electronics 20 applies an appropriate drive signal to the driver 104 via the lead wire 110. Other driver devices are also considered and are also within the scope of this specification and claims.

The meter electronic device 20 receives sensor signals from the lead wire 111 and the lead wire 111b, respectively. The meter electronic device 20 generates a drive signal on the lead wire 110, and the driver 104 vibrates the flow conduits 103A and 103B by this signal. Other sensor devices are also considered, which are also within the scope of this specification and claims.
The meter electronic device 20 processes the left-side velocity signal and the right-side velocity signal from the pick-off sensors 105 and 105b, and calculates, for example, a flow rate. The communication path 26 provides input and output means that allow the meter electronic device 20 to communicate with an operator or other electronic device. The description in FIG. 1 provides only an example of the operation of the Coriolis flow meter and is not intended to limit the teachings of the present invention.
In one embodiment, the meter electronic device 20 is configured to vibrate the flow tubes 103A, 103B. The vibration is performed by the driver 104. Further, the meter electronic device 20 further receives the vibration signal obtained from the pick-off sensors 105a and 105b. These vibration signals are the response vibrations of the flow tubes 103A and 103B. The meter electronic device 20 processes these response vibrations to determine the response frequency and / or phase difference. Further, the meter electronic device 20 processes the response vibration to obtain a measured value for one or more flows including the mass flow rate and / or density of the fluid. Other response vibration characteristics and / or flow measurements are also considered and are also within the scope of this 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. May be good. Additional flow meter shapes and / or forms may be used, which are also included herein and in the claims.
FIG. 4 is an exploded view showing a flameproof feedthrough 200 according to an embodiment of the present invention. The flameproof feedthrough 200 according to the present embodiment has a feedthrough element 210 having a substantially planar shape, a first interface region 211, and a second interface region 212, and the first one. One or more conductors 217 are extended between the interface region 211 and the second interface region 212. The flameproof feedthrough 200 further comprises one or more body portions 220 attached to the feedthrough element 210. One or more body portions 220 hold the feedthrough element 210 in an appropriate position 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, such as the first body portion 220A and the second body portion 220B, are used. 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 the present embodiment is assembled, the feedthrough element 210 is sandwiched between the first main body portion 220A and the second main body portion 220B. When the first main body portion 220A, the feedthrough element 210 and the second main body portion 220B are assembled, the feedthrough element 210 is substantially prevented from being placed between each of the first main body portion 220A and the second main body portion 220B. A flaming 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. It may also be necessary to use feedthroughs in the opening to transmit power and / or electrical signals between the two sides or between the chamber and the outside of the chamber.
Depending on the embodiment, the feedthrough element 210 may have a substantially planar shape. The feedthrough element 210 has a substantially flat or planar surface that is fastened by a first body portion 220A and a second body portion 220B. However, the feedthrough element 210 may be formed in any desired or required 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 to the first interface region 211. However, this is not a requirement and the second interface area 212 may be in any position / orientation with respect to the first interface area 211.

The feedthrough element 210 has one or more conductors 217 extending from the first interface region 211 to the second interface region 212. The one or more conductors 217 may be outer conductors 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 completely formed within the feedthrough element 210. The 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 nonflammable material, a flameproof material or a heat resistant material. Depending on the embodiment, 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 completely provided inside 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. Extending, the second interface region 212 extends at least partially from the second side 202 (see FIG. 5). Therefore, the ends of one or more conductors 217 of the first interface region 211 are exposed to be electrically contacted or coupled. Similarly, the ends of one or more conductors 217 of the second interface region 212 are similarly exposed to be electrically contacted or coupled. A first electrical connector (or similar device) may be attached or fixed to the first interface region 211 and its conductors. A second electrical connector (or similar device) may be attached or fixed to the second interface region 212 and its conductor.

When the first main body portion 220A, the feedthrough element 210 and the second main body portion 220B are assembled and the feedthrough element 210 is narrowed by the first main body portion 220A and the second main body portion 220B, the feedthrough element A substantially flameproof interface is formed between 210 and each of the first main body portion 220A and the second main 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 that the contact surfaces 231A and 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 come into contact with the feedthrough element 210). It has a flame path length equal to the thickness in the surface). It is important to minimize the gap between each of the two contact surfaces 231A and 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. Compliance with flameproofing standards requires small gaps, long flame paths, 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 will contain sufficient heat to cause ignition. A flame with an amount or energy content may be selected so that it does not propagate from one side of the flameproof feedthrough 200 to the other.

The fit between each of the body portion 220A and the body portion 220B and the feedthrough element 210 is very important. It is desirable that there are no gaps. Gap allows gas to leak and can cause gas to ignite. Gap can allow ignition products to propagate through the joint. Therefore, the feedthrough element 210 and the contact surfaces 231A and 231B are very smooth and uniform, i.e. meet certain surface finishing requirements.
In addition, it may also be important that the outer surface 232 of the body portion 220 fits 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 the minimum gap and the appropriate flame path length.
In some assembly methods according to some embodiments, one or more body portions 220 may be attached to the feedthrough element 210 to form a spigot type joint. The assembled flameproof feedthrough 200 is then flattened, milled, grindered, etched and lathed 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 with respect to the opening to achieve a gap less than a predetermined gap tolerance.

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

In any of the assembly methods, one or both of the body portion 220 and the feedthrough element 210 is to achieve a given surface smoothness and / or a gap less than a given gap tolerance. It suffices if it is machined to achieve the above. For example, the feedthrough element 210 and / or the two or more body portions 220A, 220B are manufactured to be larger than the desired thickness, and then the assembled flameproof feedthrough 200 is a flameproof feedthrough. It may be flattened, milled, etched, polished, or otherwise processed until the 200 has the desired perimeter size and shape as well as the desired uniformity. The feedthrough element 210 and / or two or more body portions 220A, 220B are 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 one or more conductors 217 with a given impedance characteristic. Needless to say, the impedance characteristics of the individual conductors 217 may be the same or different. One or more conductors 217 of the feedthrough element 210 may be formed with high precision. The 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, or may have one or more ground plates. The 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 may include having passive and / or active electrical components as part of the feedthrough element 210 or as part of a subsequent electrical circuit. Further, in some embodiments, the flameproof feedthrough 200 may have interchangeable feedthrough elements 210 with varying impedances / resistors. Therefore, the flameproof feedthrough 200 can be assembled to have a desired impedance / resistance among a plurality of promising candidate impedances / resistors.

In some embodiments, the feedthrough element 210 is at least partially bendable. In an embodiment in which the feedthrough element 210 is bendable, the feedthrough element 210 is configured to be sandwiched between two body portions 220A, 220B, from outside 201 of the barrier and 202 inside the barrier. It may extend in any direction from. For example, in some embodiments, the feedthrough element 210 may be a flexible member similar to a ribbon cable.
In some embodiments, the flameproof feedthrough 200 may further have 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 may be sandwiched between the components described above. Alternatively, the seal may be a liquid, paste, grease or other material that does not have a predetermined shape and can be applied to one or more of the components of the flameproof feedthrough 200. You may. The one or more seals may be materials that are substantially unchanged. Alternatively, the one or more seals may be a material that hardens, cures, or otherwise changes, or may change during or after the assembly process.
FIG. 5 shows a flameproof feedthrough 200 according to an embodiment of the present invention located within an 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 so that the resulting gap is less than a predetermined gap threshold. The predetermined gap threshold, along with the flame path length, must meet the flame protection criteria.

The flameproof feedthrough 200 may have straight sides or may have tapered sides. The tapered flameproof feedthrough 200 can create greater resistance when removed-eg, there is a pressure difference between the first side 201 and the second side 202. In addition, this tapered shape makes it easy to assemble the product.
Further, the flameproof feedthrough 200 further has a gap between the first main body portion 220A and the feedthrough element 210, and a gap between the feedthrough element 210 and the second main body portion 220B. ing.

As can be seen from this figure, the feedthrough element 210 penetrates the flameproof feedthrough 200. The feedthrough element 210 projects to the first side 201 and the second side 202. As a result, the first interface area 211 of the feedthrough element 210 extends at least partially to the first side 201, and the second interface area 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. The one or more slots 215 may function to position the 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 join the first body portion 220A and the second body portion 220B. Needless to say, 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 may have one or more first openings 213. The one or more first openings 213 may be located in the first interface area 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. The one or more first openings 213 may have any pad, through plating for conduction, or other function for coupling 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. The one or more second openings 219 may have any pad, through plating for conduction, or other function for coupling conductors. Depending on the embodiment, 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 that extend outward. The mounting flanges 221A and 221B may be configured to be mounted on a surface (or a plurality of surfaces) surrounding the opening. The mounting flanges 221A and 221B may be configured to prevent the first body portion 220A and the second body portion 220B from entering the opening too much or passing 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 on 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 and 229B that extend at least partially in the opening. The opening flanges 229A and 229B may correspond to and fit one or more side walls of the opening. The opening flanges 229A and 229B are adapted to 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 the one or more alignment nails 227.
The main body portions 220A and 220B have cross-opening flanges 230A and 230B configured to be pressed against both side surfaces of the feedthrough element 210. The cross-opening flanges 230A and 230B extend across substantially the central portion of the opening. Depending on the embodiment, the cross opening flanges 230A and 230B may substantially divide the opening into two, but it goes without saying that the cross opening flanges 230A and 230B are arranged at any position in the opening. May be good.

The cross opening flanges 230A and 230B may have clearance fastener openings 240A and 240B, or may have engaging fastener openings 241A and 241B. The clearance fastener openings 240 may alternate with the engaging fastener openings 241. In this case, the fastener 235 passes through the clearance fastener opening 240 in one main body portion 220 and engages with the engaging fastener opening 241 in the other main body portion 220. Depending on the embodiment, the engaging fastener opening 241 may be a threaded opening and the fastener 235 may be a threaded fastener.
The first body portion 220A and the second body portion 220B have face plates 226A and 226B 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 main body portion 220A and the second main body portion 220B may have other alignment functions such as function 263 or a fastener function. These functions 263 may have recesses and / or protrusions that receive or cooperate with one or more components of 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 prevents the first interface region 211 from being assembled. The second interface region 212 extends at least partially from the first side 201 of the flameproof feedthrough 200 and at least partially extends from the second side 202 of the assembled flameproof feedthrough 200. Located in. The first electrical connector (or similar device) may be attached to or fixed to the first interface region 211 and the conductors therein. The second electrical connector (or similar device) may be attached or fixed to the second interface region 212 and the conductors therein. The fastener 235 may penetrate the clearance openings 240A and 240B, engage with the engaging fastener openings 241A and 241B, and tighten the first main body portion 220A and the second main body portion 220B. In addition, the fastener 235 may be adapted to ensure the alignment of each body portion even after machining work.

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 its peripheral surface relative to the inner surface of the opening. It may be flattened, milled, grindered, etched, latheed, or otherwise processed to achieve a predetermined gap tolerance. Instead, as described above, one or both of the feedthrough elements 210 and the cross-opening flanges 230A, 230B, when assembled, provide a substantially flameproof interface, i.e. the body. It may be machined to achieve a gap below a predetermined gap threshold between the portion 220 and the feedthrough element 210 and / or to achieve an outer surface tolerance and minimum gap with respect to the opening. In any of the assembly methods 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. You may be.

FIG. 7 shows a first main body portion 220A and a second main body portion 220B assembled to the feedthrough element 210 of FIG. As can be seen from the figure, there is virtually no 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 main body portions 220 are composed of a single main body portion 220. The feedthrough element 210 is machined to a predetermined profile tolerance to form a substantially flameproof flange type interface between the feedthrough element 210 and the surface surrounding the opening.
The body portion 220 may overlap the openings and be located on one side of the opening surface (shown on the first side 201 for illustrative purposes only). As mentioned above, the body portion 220 may have any suitable thickness and may be made of 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. Depending on the embodiment, the main body portion 220 may be designed to completely close the opening. Instead, the body portion 220 may have a different shape from the opening.
Similarly, the feedthrough element 210 also overlaps the opening. However, the overlap by the feedthrough element 210 is not limited to the one that matches the overlap by 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 is intended to provide a flameproof closing 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 the surface surrounding the opening. As shown, the 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. Thus, 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 that surrounds the openings.

As mentioned above, the feedthrough element 210 may have any suitable thickness and may be formed from any suitable material. As mentioned 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 in shape from the opening. However, the feedthrough element 210 overlaps the openings, completely overlaps the openings, and there is no portion left uncovered by the openings.
The feedthrough element 210 has a first interface region (or a plurality of first interface regions) 211 extending at least partially from the main body portion 220 on the first side 201. The first interface area 211 may have or receive an electrical connector 860 or other suitable component.

The feedthrough element 210 resides in the opening and has a second interface region 212 that extends at least partially from the feedthrough element 210 on the second side 201. The second interface area 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 of the present invention and the method of the present invention may be embodied according to any of the above embodiments to provide multiple advantages. The flameproof feedthrough 200 may be designed 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 a small tolerance or a small gap that can be manufactured economically and accurately.

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

Claims (8)

A method of forming a flameproof feedthrough that is adapted to be used for openings.
A step of providing a feedthrough element having a planar shape, a first interface region, and a second interface region, one between the first interface region and the second interface region. The process of providing the feedthrough element to which the above conductors are extended and
It comprises attaching two or more body portions to the feedthrough element to hold the feedthrough element in an appropriate position with respect to the opening.
The first interface region of the feedthrough element extends at least partially to the first side of the flameproof feedthrough, and the second interface region of the feedthrough element is said flameproof. At least partially extended to the second side of the feedthrough, the peripheral surfaces of the two or more body parts and the feedthrough ends of the feedthrough elements are protected between the flameproof feedthrough and the opening. It has a given perimeter size and shape to create a flammable interface , and also
A method comprising the step of forming a spigot-type joint by sandwiching the feedthrough element (210) between two or more body portions. The method of claim 1, wherein the feedthrough element is a printed circuit board (PCB). The method of claim 1, wherein the one or more conductors are one or more inner or outer conductors. The method of claim 1, wherein the feedthrough element provides the one or more conductors with a given impedance characteristic. The method of claim 1, further comprising machining the feedthrough element to a predetermined profile tolerance. Further comprising the method of claim 1 the step of machining the feed-through end of the feed-through elements so that the peripheral surface flush with the two or more body parts. Between the opening and the flame of the feedthrough to form a flame of interfaces, said two or more body parts circumferential surface and the feed-through end a predetermined of said feed-through element The method of claim 1, further comprising a step of machining into a peripheral size and shape. The mounting process
The first aspect of the present invention includes a step of machining the feedthrough element to a predetermined profile tolerance in order to form a flameproof interface between the feedthrough element and the two or more main body portions. the method of.

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