JPH1050397A - Explosion proof connector for high-frequency radio communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an explosion-proof connector for an explosion-proof cabinet, capable of electrically connecting an external conductor and an internal conductor to each other and free of easy deterioration in a fire distinction function by external force. SOLUTION: This connector is so constituted as to concentrically dispose a rod-shaped center contact 9A that is a signal conductor inside of a cavity metal sleeve 5A at both ends, having an internal connection screw 5b and an external connection screw 5c. In this case, a longer diameter portion 9a whose surface is given a roulette is integrally formed at a lengthwise intermediate portion of the center contact 9A, the center contact 9A is held inside of the cavity metal sleeve 5A by means of an insulation resin bush 10 and a rigid insulation sheathing board 13, in a state of which a solidification insulation resin 12A is charged in an internal space 11 of the cavity metal sleeve 5A with air tightness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio frequency radio device, and more particularly to an explosion-proof connector used for a radio frequency radio device.

[0002]

2. Description of the Related Art As is well known, in various factories and plants, a radio communication system in a high-frequency band such as 1.9G is used for information exchange and emergency communication between a management office and a site. I have. That is, as shown in FIG. 5, the high-frequency wireless communication system includes a plurality of fixed wireless devices (wireless base stations) C _a and C _b connected to the private branch exchange A via communication lines B ₁ and B _2. those comprising, performing wireless communication with the fixed radio apparatus C _a, a large number of mobile terminals D _a via a C _b area, D _b and private branch exchange device a. That is, using such a high-frequency wireless communication system, another telephone E connected to the private branch exchange A via the fixed wireless devices C _a and C _b and the mobile terminals D _a and D _{b at the} site. , And an emergency call from the management office can be sent to the mobile terminals D _a and D _b at the same time via the fixed wireless devices C _a and C _b .

When the high-frequency wireless communication system as described above is introduced into a petroleum plant or a gas fuel power plant that handles volatile gas, the fixed wireless devices C _a and C _b installed in an explosion-proof area are subject to an explosion accident. It is required to have an explosion-proof structure that prevents such problems.

Therefore, in the fixed wireless devices C _a and C _b used for such applications, devices and units which may generate a spark during circuit operation are incorporated in an airtight explosion-proof housing. However, although the external antenna provided in the explosion-proof housing and the internal unit are electrically coupled via an electrical connector, the conventional electrical connector is
Flame elimination of volatile gases is not considered.
That is, FIG. 6 shows an electric connector for an external antenna G installed on the housing F of the fixed wireless devices C _a and C _b . This electric connector is provided with a mounting flange h ₁ that can be fixed to the housing F in the longitudinal direction. A hollow metal sleeve H is integrally formed at an intermediate portion, and an internal connection screw h _{2 of} the hollow metal sleeve H is provided.
It can be connected to the internal circuits of the casing F, the external connection thread h ₃ of the hollow metal sleeve H can be coupled to an external antenna socket. And, in the center of the hollow metal sleeve H with conductive, by a pair of insulating spacer I _1, I _2, the center contact J which signal is applied is concentrically supported, the insulating spacer I _1, I ₂ and the center contact J are prevented from coming out of the hollow metal sleeve H by a retaining bush K press-fitted from one end of the hollow metal sleeve H.

[0005]

However, according to the conventional electric connector as described above, there is a small gap between the inner peripheral surface of the hollow metal sleeve H and the outer peripheral surfaces of the insulating spacers I ₁ and I ₂ . Since the external volatile gas may enter the internal space of the hollow metal sleeve H through the gap, the volatile gas may be ignited by the spark inside the housing F. Also, according to the explosion-proof hard ball drop impact test, an impact test in a plane perpendicular to the same direction as the impact test in the length direction of the center contact J is required. When added to J, the center contact J is deformed and the insulating spacers I ₁ ,
The position of the I ₂ "shift" is occurring, flame Yat removed by performance deteriorates.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional electric connector used for high-frequency radio, the object of the present invention is to not only electrically connect the external conductor and the internal conductor, but also to dissipate the flame by external force. An object of the present invention is to provide an explosion-proof connector for an explosion-proof housing in which the leaving function is not easily deteriorated.

[0007]

In order to achieve this object, the present invention concentrically arranges a rod-shaped center contact as a signal conductor inside a hollow metal sleeve having internal connection screws and external connection screws at both ends. In the electrical connector, a large-diameter portion with a knurl on the surface is integrally processed into the middle portion in the longitudinal direction of the center contact, and a center is formed inside the hollow metal sleeve by an insulating resin bush and a rigid insulating weir plate. An explosion-proof connector for high-frequency wireless communication in which a solidified insulating resin is hermetically filled in an inner space of the hollow metal sleeve while holding a contact. According to the present invention, there is provided an electric connector in which a rod-shaped center contact serving as a signal conductor is concentrically arranged inside a hollow metal sleeve having an external connection screw at one end and a circuit board connection portion at the other end. An insulating resin molded body is integrally formed at an intermediate portion of the center contact, and the center contact is held concentrically at the center of the hollow metal sleeve,
This can also be achieved by a high-frequency wireless explosion-proof connector in which a solidified insulating resin is hermetically filled in a space surrounded by the inner peripheral flange of the hollow metal sleeve and the insulating resin molded body. In the following description of embodiments of the present invention, an electric connector in which a rod-shaped center contact serving as a signal conductor is concentrically arranged inside a hollow metal sleeve having an external connection screw at one end and a circuit board connection portion at the other end. An insulating resin molded body is integrally formed at an intermediate portion of the center contact, the center contact is concentrically held at the center of the hollow metal sleeve, and a female screw is formed on an inner peripheral surface at one end of the hollow metal sleeve. A state in which a knurled brim is processed at an intermediate portion of the center contact surrounded by an inner circumferential brim of the hollow metal sleeve and reaches the female screw in a space surrounded by the inner circumferential brim and the insulating resin molded body. A structure in which the solidified insulating resin is filled in an airtight manner will be described. In an embodiment of the present invention to be described later, an electric connector in which a rod-shaped center contact serving as a signal conductor is concentrically arranged inside a hollow metal sleeve having internal connection screws and external connection screws at both ends, has a large diameter. A brim was integrally formed at the middle portion of the center contact in the longitudinal direction, and a thick cylindrical insulating resin bush was fitted on both sides of the center contact, and the insulating bush was air-tightly pressed into the internal space of the hollow metal sleeve. A high-frequency wireless explosion-proof connector having a structure is described.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention applied to a fixed wireless device.
1 shows an explosion-proof connector 1A according to an embodiment, which is used to electrically couple an external antenna socket 3 and an internal connector socket 4 attached to an explosion-proof housing 2 of a fixed wireless device.

In FIG. 1, a hollow metal sleeve 5A integrally formed with a mounting flange 5a on one end outer peripheral surface has an internal connection screw 5b and an external connection screw 5c at both ends, and an explosion-proof housing is provided for the internal connection screw 5b. An internal connector socket 4 led from a circuit board inside the body 2 is connected, and
The external antenna socket 3 is screwed and fixed to the external connection screw 5c. That is, the fixing screw 5d on the outer peripheral surface of the hollow metal sleeve 5A is fixed to the fixing hole 2a from outside the explosion-proof housing 2.
O-ring 6A is fixed between the entrance of the fixing hole 2a and the outer peripheral surface of the hollow metal sleeve 5A.
Airtight. The hollow metal sleeve 5
A is firmly fixed to the explosion-proof housing 2 by the holding ring 7 and the fixing bolt 8 seated on the mounting flange 5a. A rod-shaped center contact 9A, which is a signal conductor, is concentrically arranged inside the hollow metal sleeve 5A. A large-diameter portion having a knurled surface on the surface is provided at the center in the longitudinal direction of the center contact 9A. 9a will be integrally processed.

In the case of assembling the center contact 9A with the hollow metal sleeve 5A, an insulating resin bush 10 made of fluororesin, which is brought into contact with a flange of the center contact 9A, is fitted to the outer end of the center contact 9A, and An insulating resin such as epoxy resin in a liquid state is filled in the internal space 11 of the hollow metal sleeve 5A accommodating 9a, and the insulating resin is solidified in the internal space 11 to be a solidified insulating resin 12A. That is, the insulating resin bush 10
Is a center contact 9A at the center of the hollow metal sleeve 5A.
However, the internal space 11 released before the solidification of the solidified insulating resin 12A is closed by an insulating weir plate 13 having an appropriate tracking index.
In the case of the illustrated embodiment, the insulating weir 13 is made of an epoxy resin laminated plate on the surface, but the insulating weir 13 is an insulating stopper which is pressed into the inner end of the hollow metal sleeve 5A. The bush 14A prevents the hollow metal sleeve 5A from coming off.

[0011] explosion-proof connector according to the first embodiment, since the structure described above, since the relative interior space 11 of the hollow metal sleeve 5A solidified insulating resin 12A of the fixed distance L ₁ is filled, the prior art As described above, the volatile gas does not enter the inside of the hollow metal sleeve 5A from the outside and the spark inside the explosion-proof enclosure 2 does not ignite the volatile gas. Thus, a structure suitable for a high-frequency wireless device with high wireless efficiency can be obtained. Further, in the explosion-proof connector, even if an impact force in the length direction of the center contact 9A or in a plane perpendicular to the length direction is applied during the hard ball drop impact test, the center contact 9A
Is firmly held in the hollow metal sleeve 5A by the large-diameter portion 9a and the solidified insulating resin 12A, so that the flameproof impact standard can be sufficiently satisfied in terms of mechanical strength. Further, if the insulating weir 13 is made of an epoxy resin laminate as described above, the aging resistance to the flame can be satisfied.

FIG. 2 shows an explosion-proof connector 1B according to a second embodiment of the present invention.
B is firmly fixed to the explosion-proof housing 2 by the holding ring 7 and the fixing bolt 8 which are seated on the mounting flange 5a, as in the case of the first embodiment.
An O-ring 6B for maintaining airtightness between the explosion-proof housing 2 and the fixing hole 2a is located on the outer peripheral surface of the explosion-proof housing 2. A hollow metal sleeve 5B made of brass or the like has an external connection screw 5c at one end.
Is provided with a circuit board connecting portion 5d at the other end, and a rod-shaped center contact 9B as a signal conductor is concentrically arranged inside the hollow metal sleeve 5B. That is, the external antenna socket 3 is screwed and fixed to the external connection screw 5c of the hollow metal sleeve 5B, and the circuit board connection portion 5d inside the explosion-proof housing 2 can be connected to the printed circuit board 15 by soldering. Then, in the internal space 11 of the hollow metal sleeve 5B, a center contact 9B integrally formed with an insulating resin molded body 12B at the center is dropped from the connection screw 5c side, and the insulating resin molded body 12B is hollow. Metal cylinder 5e pressed into the opening of metal sleeve 5B
Is fixed concentrically in the hollow metal. The hollow metal sleeve 5B for receiving the insulating resin molded body 12B
A female screw is formed on the inner periphery of the inner peripheral collar 5f, and a space surrounded by the inner peripheral collar 5f and the insulating resin molded body 12B is filled with an insulating resin such as an epoxy resin in a liquid state. The insulating resin 16B is used. Of course, solidified insulating resin 16B
At the time of filling, if bubbles exist in the resin layer,
Because can not be secured fixed distance L ₂ required, nor to what is needed is a leaving bubbles in the resin is pointed out.

[0013] explosion-proof connector according to the second embodiment, since the structure described above, since the relative interior space 11 of the hollow metal sleeve 5B solidified insulating resin 16B of the fixed distance L ₂ is filled, hollow metal The volatile gas does not enter the inside of the sleeve 5B from the outside, so-called "flame escape"
The structure can be a structure suitable for a high-frequency wireless device with good wireless efficiency. Also, with the explosion-proof connector,
At the time of the hard ball drop impact test, even if an impact force in the length direction of the center contact 9B or a plane perpendicular to the length direction is applied, the center contact 9B is separated by the insulating resin molded body 12B and the solidified insulating resin 16B. Since the hollow metal sleeve 5B is firmly held, the mechanical strength is sufficient.

FIG. 3 shows an explosion-proof connector 1C according to a third embodiment of the present invention. The hollow metal sleeve 5C of the explosion-proof connector 1C is attached to the explosion-proof housing 2 by a holding ring 7 and a fixing bolt 8 which is seated on a mounting flange 5a. Although firmly fixed, a seal ring 17 for maintaining airtightness with the fixing hole 2a of the explosion-proof housing 2 is located on the outer peripheral surface of the mounting flange 5a. The hollow metal sleeve 5 of the third embodiment
C has a structure having an external connection screw 5c at one end and a circuit board connection portion 5d at the other end, as in the case of the second embodiment.
Inside the hollow metal sleeve 5C, a rod-shaped center contact 9C as a signal conductor is concentrically arranged. That is, the external antenna socket 3 is screwed and fixed to the external connection screw 5c of the hollow metal sleeve 5C, and the circuit board connecting portion 5d inside the explosion-proof housing 2 is connected to the printed circuit board 1
5 can be connected by soldering.

The internal space 11 of the hollow metal sleeve 5C
In the same manner as in the second embodiment, the center contact 9
The insulating resin molded body 12C integrally molded is dropped into the intermediate portion of C, and the insulating resin molded body 12C is prevented from coming out of the hollow metal sleeve 5C by the metal cylinder 5e. The center contact 9C concentric with the inner peripheral flange 5f for receiving the inner end of the insulating resin molded body 12C.
9g of knurled flange is processed in the middle part of the above, and the solidified insulating resin 16C is air-tightly filled in a space surrounded by the insulating resin molded body 12C and the inner peripheral flange 5f. In this case, if the female screw 18 is formed on the inner peripheral surface of the hollow metal sleeve 5C and the solidified insulating resin 16C is filled to reach the female screw 18, airtightness with the hollow metal sleeve 5C can be improved. Can be strengthened.

The explosion-proof connector 1C according to the third embodiment, since the structure described above, the solidified insulating resin 16 sticking distance L ₃ for the interior space 11 of the hollow metal sleeve 5C
Since C is filled, it is possible to provide a "flame escape" structure in which volatile gas does not enter the inside of the hollow metal sleeve 5C from the outside. In addition, in the explosion-proof connector 1C, even when an impact force in the length direction of the center contact 9C or in a plane perpendicular to the length direction is applied during the hard ball drop impact test, the knurl 9g of the center contact 9C and Since the hollow metal sleeve 5C is firmly held by the solidified insulating resin 16C which is kept airtight by the female screw 18, a structure having sufficient mechanical strength is obtained.

An explosion-proof connector 1D according to a fourth embodiment of the present invention shown in FIG. 4 has a hollow metal sleeve 5D integrally formed with a mounting flange 5a on one end outer peripheral surface, similarly to the first embodiment. Internal connection screw 5b and external connection screw 5
and a large-diameter flange 9f is integrally formed at a longitudinally intermediate portion of the rod-shaped center contact 9D which is a signal conductor, and thick cylindrical insulating resin bushes 20A and 20B are provided on both sides of the center contact 9D. Has been fitted. That is, since these insulating resin bushes 20A and 20B have an outer diameter slightly larger than the inner diameter of the hollow metal sleeve 5C and a diameter slightly smaller than the outer diameter of the center contact 9D, Airtight press-fit.
The inner ends of the hollow metal sleeve 5D are provided with two insulating resin bushes 20A, 20A from the inside of the hollow metal sleeve 5D.
A retaining bush 14D for preventing B from coming out is press-fitted.

The explosion-proof connector 1D according to the fourth embodiment, since the structure described above, since the insulating resin bush 20A of fixed distance L _4, 20B are pressed against the inner space 11 of the hollow metal sleeve 5D , Hollow metal sleeve 5
No volatile gas enters the interior of D from outside. "
It can provide a “flame escape” structure.
In D, the insulating resin bush 20A, which is pressed into the hollow metal sleeve 5D even when an impact force in the length direction of the center contact 9D or in a plane perpendicular to the length direction is applied during the hard ball drop impact test, 20B and retaining bush 14
Since the center contact 9D is firmly held by the hollow metal sleeve 5D at D, a structure having sufficient mechanical strength is obtained.

In the above description of the embodiment, an example of an explosion-proof connector used for connecting an external antenna has been described. However, the explosion-proof connector 1D of the present invention can be used for high-frequency radio for other uses.

[0020]

As is apparent from the above description, according to the present invention, a "flame escaping" structure in which volatile gas does not enter from the outside to the inside, and the impact load of the hard ball drop impact test is An explosion-proof connector for high-frequency radio having sufficient durability and mechanical strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a high-frequency wireless explosion-proof connector according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a high-frequency wireless explosion-proof connector according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a high-frequency wireless explosion-proof connector according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a high-frequency wireless explosion-proof connector according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram of a conventional high-frequency wireless communication system.

FIG. 6 is a sectional view of a conventional electrical connector.

[Explanation of symbols]

 1A to 1D Explosion Proof Connector 2 Explosion Proof Housing 5A to 5D Hollow Metal Sleeve 5b Internal Connection Screw 5c External Connection Screw 5d Circuit Board Connection 9A to 9D Center Contact 9a Large Diameter 9f Collar 10 Insulating Resin Bush 12A Solidified Insulating Resin 12B, 12C Insulating resin molded body 13 Insulating dam 16B, 16C Solidified insulating resin 18 Female screw 20A, 20B Insulating resin bush

Claims (4)

[Claims] 1. An electrical connector in which a rod-shaped center contact, which is a signal conductor, is concentrically arranged inside a hollow metal sleeve having an internal connection screw and an external connection screw at both ends. Is formed integrally with the center of the center contact in the longitudinal direction, and the center contact is held inside the hollow metal sleeve by an insulating resin bush and a rigid insulating weir plate. An explosion-proof connector for high-frequency radio, characterized by being filled with a solidified insulating resin in an airtight manner. 2. An electrical connector in which a rod-shaped center contact as a signal conductor is concentrically arranged inside a hollow metal sleeve having an external connection screw at one end and a circuit board connection at the other end. And the center contact is concentrically held at the center of the hollow metal sleeve, and is formed in a space surrounded by the inner peripheral flange of the hollow metal sleeve and the insulating resin molded body. Explosion-proof connector for high-frequency radio, characterized by airtightly filling with solidified insulating resin. 3. An electrical connector in which a rod-shaped center contact as a signal conductor is concentrically arranged inside a hollow metal sleeve having an external connection screw at one end and a circuit board connection at the other end. An insulating resin molded body is integrally formed with the hollow metal sleeve, the center contact is concentrically held at the center of the hollow metal sleeve, a female screw is formed on an inner peripheral surface at one end of the hollow metal sleeve, and an inner peripheral surface of the hollow metal sleeve is formed. A knurled brim is processed in the middle of the center contact surrounded by the brim, and the solidified insulating resin reaching the female screw is hermetically sealed in a space surrounded by the inner circumferential brim and the insulating resin molded body. An explosion-proof connector for high-frequency radio, characterized by being filled. 4. An electrical connector in which a rod-shaped center contact, which is a signal conductor, is concentrically arranged inside a hollow metal sleeve having an internal connection screw and an external connection screw at both ends. A high-frequency radio, characterized in that the insulating bush is air-tightly press-fitted into the inner space of the hollow metal sleeve. Explosion-proof connector.