JPH11135195A - Two-pole connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-pole connector which is free of misconnections about the polarities and can prevent electrical discharges between connecting terminal pairs which are installed adjacent. SOLUTION: In a module side connector 9, a pair of cylindrical parts 30A and 30B having different outside diameters are formed parallel separated by certain spacings, and female terminals 45 are accommodated in the foremost parts of the cylindrical parts 30A and 30B. In a receptacle side connector 50, a pair of bottomed inserting holes 70A and 70B having inside diameters corresponding to the respective cylindrical parts 30A and 30B are formed parallel, in such a way so as to be apart with a partition wall 53 interposed in between, and male terminals 45 are accommodated in the inserting holes 70A and 70B. The cylindrical parts 30A and 30B are inserted into the corresponding inserting holes 70A and 70B to generate connections of the two connectors 9 and 50, and thereby the male terminals 45 and female terminals 95 are connected together inside the inserting holes 70A and 70B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a two-pole connector used in a photovoltaic power generation system or the like, for example.

[0002]

2. Description of the Related Art In recent years, various photovoltaic power generation systems for ordinary houses have been developed. In such a photovoltaic power generation system, for example, a plurality of photovoltaic modules in which a plurality of photovoltaic cells are put together are arranged on a roof of a house, and each photovoltaic module is connected in series or in parallel to obtain a high voltage and a high current. ing.

Conventionally, the connection between these solar cell modules has been made by a one-pole type connector.

[0004]

However, when the solar cell modules are to be connected to each other by the one-pole type connector as described above, the positive and negative poles of the solar cell module are connected to each other. Therefore, the number of connectors required is twice as large as the number of solar cell modules to be installed, which has led to an increase in the installation cost of the solar power generation system.

Therefore, in order to solve the above problem, 2
It is conceivable to connect the solar cell modules using a polar type connector.

However, in a connector in which two terminals are simply arranged in parallel, there is a risk that the polarity may be incorrectly connected.

Further, since a voltage of several tens of volts to several hundreds of volts is applied to the connection portion between the solar cell modules described above, a pair of connection terminals on the positive pole side and a connection terminal pair on the negative pole side are applied. It is also necessary to prevent discharge between them.

Therefore, the present invention has been made to solve the above-mentioned problems, and it is possible to prevent the polarity from being erroneously connected and to prevent the discharge between the positive terminal side and the negative terminal side connection terminal pair. 2-pole type that can also prevent
It is intended to provide a pole connector.

[0009]

In order to solve the above-mentioned problems, a two-pole connector according to a first aspect of the present invention has a pair of cylindrical portions having different outer diameters formed in parallel at predetermined intervals. A module-side housing, a module-side connector having a female terminal housed and disposed in each of the tubular portions, and a pair of bottomed insertion holes having an inner diameter corresponding to each of the tubular portions, separated by a partition wall. A receptacle-side housing formed in parallel, and a receptacle-side connector having a male terminal housed and arranged in each of the bottomed insertion holes, respectively, and the two cylindrical portions are inserted into the two bottomed insertion holes having corresponding dimensions. The receptacle terminal is connected to the module side connector by inserting the female terminal and the male terminal by inserting the female terminal and the male terminal, respectively.

According to a second aspect of the present invention, the base portions of the two cylindrical portions are connected to each other through a base end connecting portion, and the base portion is connected to a front end portion of the receptacle side housing. A cover portion covering the end connection portion is formed, and a first seal member is provided around an annular contact portion between the outer peripheral surface of the base end connection portion and the inner peripheral surface of the cover portion. Second and third seal members may be provided around each annular contact portion with the inner peripheral surface of each bottomed insertion hole.

Further, as set forth in claim 3, the second and third seal members are provided on the outer peripheral surface side of the tubular member, and the second and third seal members are respectively colored differently. At the same time, a positive polarity display or a negative polarity display may be provided at each position on the outer peripheral surface of the receptacle side housing corresponding to each of the bottomed insertion holes.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a two-pole connector according to an embodiment of the present invention will be described.

This two-pole connector is, as shown in FIG.
Module-side connector 9 having a pair of female terminals 45
And a receptacle-side connector 50 having a pair of male terminals 95.

As shown in FIGS. 1 to 5, the module side connector 9 is connected to the housing main body 11 and the base connecting portion 17.
A module-side housing 10 in which a pair of cylindrical portions 30A and 30B are formed in parallel via a cap, and a cap 100 attached to the base end of the module-side housing 10.

The outer diameter of the cylindrical portion 30A on one side of the two cylindrical portions 30A and 30B is finished to be larger than the outer diameter of the cylindrical portion 30B on the other side.
The outer diameters of 0B are finished in different sizes. Further, female terminal receiving holes 31A and 31B having the same inner diameter are formed inside the respective cylindrical portions 30A and 30B. That is, the two cylindrical portions 30A and 30B are formed to have different outer diameters by changing the thickness of the respective peripheral walls.

The two female terminal receiving holes 31A and 31B are
As shown in FIG. 5, the steps 32A, 32B and 33A, 3
3B, it is formed so as to spread in a stepwise manner toward the base end side, and among them, the step portions 32A, 32B on the front end side include:
Each of the female terminals 45 is configured to be held at a fixed position by pressing the distal end of the terminal connection portion 46 of the female terminal 45.

Further, at the tip openings of both female terminal receiving holes 31A, 31B, there are formed expanded portions 34A, 34B, which insert corresponding male terminals 95 into the respective female terminal receiving holes 31A, 31B. Act as a guide when you do.

The housing body 11 has electric wire insertion holes 12A and 12B continuous with the female terminal housing holes 31A and 31B, respectively, and a retainer housing 13 formed at a base end thereof. Then, as shown in FIG. 1, by mounting the module-side retainer 25 to the retainer accommodating portion 13 and pressing the two female terminals 45 toward the distal ends, the female terminals 45 are held at fixed positions. It is configured.

That is, guide projections 15a project from the base end surfaces of the partition walls 15 of the electric wire insertion holes 12A and 12B into the retainer housing 13, and both sides of the peripheral wall 13a of the retainer housing 13 are provided. , Retainer engaging holes 14 are formed at two places on the upper surface side and one place on the lower surface side.

On the other hand, the module-side retainer 25 has a pair of terminal pressing portions 27 projecting in parallel on one side of an elliptical flat plate portion 26 having a shape corresponding to the retainer accommodating portion 13. The flat plate portion 26 has a guide recess 29 in which the guide protrusion 15a is fitted on one surface side, and a retainer engaging protrusion which is engageable with the retainer engaging hole 14 on an outer peripheral portion thereof. 28 are formed. The terminal pressing portion 27 is formed in a thin cylindrical shape, and an electric wire insertion hole through which the electric wire 2 can be inserted is formed from the terminal pressing portion 27 to the flat plate portion 26.

Then, in a state where the electric wires 2 crimped to the electric wire crimping portions 47 of the female terminals 45 are led out to the rear of the module side retainer 25 through the terminal pressing portions 27, the terminal pressing portions 27 are connected to the respective electric wires. Each female terminal 4 is inserted through the insertion hole 12A, 12B, and is
5 forward, and the tip of each female terminal 45 is
Each retainer engaging projection 28 is engaged with each retainer engaging hole 14 in a state where the female terminals 45 are locked.
Are held at fixed positions in the terminal receiving holes 32A and 32B.

A second ring groove 35 and a third ring groove 36 are provided on the outer periphery of the base ends of the cylindrical portions 30A and 30B, respectively.
Are formed, and a first ring groove 18 is formed along the outer periphery of the base end connecting portion 17 that connects the base ends of the two cylindrical portions 30A and 30B to each other.

As shown in FIG. 1, a first O-ring 21 as a sealing member is mounted in the first ring groove 18, and a red second O-ring 22 as a sealing member is mounted in the second ring groove 35. The black third O-rings 23 are mounted in the third ring grooves 36, respectively, so that inner and outer seals between the module-side connector 10 and the receptacle-side connector 50 connected to each other are achieved.

Further, an elastic member 19 is provided in a cantilever shape from the base end side of the base end connecting portion 17 to both sides of the tubular portions 30A, 30B. At the distal end of each elastic member 19, an engaging hole 20 is formed for engaging and disengaging an engaging portion 53 of the receptacle-side connector 50 described later, and both side surfaces 19a of the distal end of each elastic member 19 are formed. But these engagement holes 20
Is tapered so that the width dimension is gradually reduced toward the distal end on the distal end side from the position where is formed.

Further, an engagement groove 16 for mounting a cap 100, described later, is provided around the body of the housing body 11 between the portion where the elastic member 19 is cantilevered and the retainer housing 13. I have.

As shown in FIGS. 1 and 6 to 9, the cap 100 attached to the base end of the module side housing 10 includes a cap body 101 covering the base end side of the module side housing 10, and a pair of caps 101. A lead portion 110 from which the cable 3 in which the electric wires 2 are bundled and whose periphery is covered is led out.

On the inner peripheral surface near the opening of the cap main body 101, an engaging projection 102 is formed over the entire periphery thereof, and as shown in FIG. Each cap 100 is configured to be attached to the base end of the module side housing 10 by engaging with the engagement groove 16 of the base end of the housing 10.

The lead-out section 110 has an inner peripheral surface formed in a shape corresponding to the outer peripheral shape of the cable 3, and includes a pair of electric wires 2 connected to the female terminal 45.
Is derived from the derivation unit 110 to the outside.

Further, the outer peripheral surface of the lead-out portion 110 is formed in a bellows shape, so that stress relaxation for the cable 3 led out from the lead-out portion 110 is achieved.

Then, in a state where the cable 3 is led out from the lead-out part 110, the engaging protrusion 102 of the opening of the cap main body 101 is engaged with the engaging groove 16, and the cap 100 is connected to the base end of the module side housing 10. By mounting the module-side connector, the module-side connector 9 is assembled.

The cap 100 is also used for the receptacle-side connector 50 described below.

On the other hand, as shown in FIGS. 1 and 10 to 13, the receptacle side connector 50 includes a pair of bottomed insertion holes 70A and 70B formed in parallel, and the receptacle side housing 51. And a cap 100 attached to the base end of the cap.

The bottomed insertion holes 70A and 70B are formed with a partition wall 52 in the receptacle side housing 51 therebetween. The inner diameter of the bottomed insertion hole 70A on one side is the outer diameter of the cylindrical portion 30A. The inner diameter of the bottomed insertion hole 70B on the other side is formed substantially the same as the outer diameter of the cylindrical portion 30B.

Each of the bottomed insertion holes 70A, 70B is formed on the seal peripheral surfaces 72A, 72B whose inner diameter is set slightly larger on the opening side, and the cylindrical portions 30A, 30B are formed on the bottom thereof. Boss portions 73A, 73B having a shape corresponding to the expanded portions 34A, 34B are formed.

A pair of male terminal accommodating holes 80 communicating with the bottomed insertion holes 70A and 70B through the through holes 81 are formed inside the base end of the receptacle-side housing 51.

The male terminal 95 accommodated in each male terminal accommodating hole 80 has a flange 93 formed between an electric wire crimping portion 91 and a pin-shaped male connecting portion 92, and a distal end is formed by a receptacle-side retainer 65 described below. And is positioned and held in the male terminal receiving hole 80.

That is, on the base side of each male terminal accommodation hole 80, a retainer accommodation part 60 is provided. A guide projection 61 projects from the base end face of the partition wall 59 between the male terminal receiving holes 80 in the receptacle side housing 51 into the retainer receiving section 60 and the retainer receiving section 6 is formed.
Retainer engagement holes 63 are formed at two locations on both sides, the upper surface side, and one location on the lower surface side of the 0 peripheral wall 62.

On the other hand, the receptacle side retainer 65 is an elliptical flat plate portion 66 having a shape corresponding to the retainer housing portion 60.
A pair of electric wire insertion holes 67 are formed at positions corresponding to the male terminal accommodation holes 80 of the flat plate portion 66,
A retainer engaging projection 68 is formed at each position on the peripheral surface corresponding to each retainer engaging hole 63.

The male connecting portion 9 of the male terminal 95
2 are inserted into the through holes 81 so that the male connection portions 92 protrude from the bottoms of the bottomed insertion holes 70A and 70B, and the electric wires 2 connected to the electric wire crimping portions 91 of the male terminals 95 are connected to the respective receptacles 65. In a state of being drawn out from the electric wire insertion hole 67, the receptacle-side retainer 65 is fitted into the retainer accommodating portion 60, and each retainer engaging protrusion 6 is inserted.
The male terminals 95 are pressed by the receptacle-side retainer 65 toward the distal end side of the receptacle-side housing 51 by engaging the male terminals 9 with the respective retainer engagement holes 63, and each male terminal 9 is pressed.
5, the male terminal 95 is positioned and held by locking the flange portion 93 of the male terminal accommodating hole 80 at the distal end side cut portion.

A cover 58 having an inner peripheral surface shape corresponding to the outer peripheral surface of the base connecting portion 17 of the module-side connector 10 is formed on the opening side of both the bottomed insertion holes 70A and 70B. The cover portion 58 is formed so as to cover the base end connecting portion 17 when the side connector 9 and the receptacle side connector 50 are connected.

Guide frames 57 are formed on both sides of the outer peripheral surface of the cover portion 58, and engaging holes 20 of the elastic member 19 are formed in the base ends of the guide frames 57 on both sides of the receptacle side housing 51. Engaging portion 53 that engages with and disengages from
Are formed. Each engaging portion 53 is tapered so that the outer surface thereof gradually decreases in height toward the distal end of the receptacle-side housing 51.

As shown in FIG. 10, in a region corresponding to the cylindrical portion 70A on the upper surface side of the receptacle side housing 51, a display 54A of a "+" character (display of a positive polarity) is formed so as to protrude. In addition, in a region corresponding to the cylindrical portion 70B, a display portion 54B (display of negative polarity) of a character "-" is formed so as to protrude.

Further, an engagement groove 55 is provided on the outer peripheral surface of the peripheral body on the base end side of the receptacle side housing 51. Then, with the cable 3 including the electric wire 2 drawn out from the wire insertion hole 67 of the receptacle side retainer 65 being led out from the lead-out part 110 of the cap 100, the engaging projection 102 of the opening of the cap main body 101 is engaged. By fitting the cap 100 to the base end of the receptacle-side housing 51 by engaging with the groove 55, the receptacle-side connector 50 is assembled.

Next, the connection operation between the module side connector 9 and the receptacle side connector 50 will be described.

First, an operator who wants to connect the connector 9 and the connector 50 has the color of the second O-ring 22 and the third O-ring 33 attached to the cylindrical portions 30A and 30B of the module-side connector 9 and the receptacle side. After visually confirming the display portions 54A and 54B attached to the housing 51 and confirming the polarity, the one cylindrical portion 30A is inserted into the corresponding one of the bottomed insertion holes 70A and the other cylindrical portion. 3
0B is inserted into the corresponding bottomed insertion hole 70B on the other side, and the connector 9 is pushed into the receptacle-side connector 50 side.

As a result, the elastic member 19 is moved 5 in the guide frame.
7 and move on both sides of the receptacle-side housing 51, the engaging portion 53 is elastically engaged with the engaging hole 20 at the distal end thereof, and the connection work of the connectors 9 and 50 is completed.

At this time, the first O-ring 21 mounted on the base connecting portion 17 at the distal end of the housing main body 11 is in close contact with the inner peripheral surface of the cover portion 58, and the waterproofing at the connecting portion between the two connectors 9, 50 is performed. Is achieved.

Further, the second O-ring 22 and the third O-ring 23 of both the cylindrical portions 30A, 30B are in close contact with the inner peripheral surfaces of the bottomed insertion holes 70A, 70B, respectively, so that the bottomed insertion holes 70A, 70B are formed. The waterproof inside is further improved.

On the other hand, to release the connection between the connectors 9 and 50, the distal ends of the elastic members 19 are separated from both sides of the receptacle-side housing 51, and the engaging portions 53 and the engaging holes 2 are released.
This is performed by pulling out the module-side connector 9 from the receptacle-side connector 50 in a state where the engagement with the module 0 is released.

By the way, if the connector connecting operator erroneously tries to insert the cylindrical portion 30A into the bottomed insertion hole 70B and the cylindrical portion 30B into the bottomed insertion hole 70A, that is, to erroneously change the polarity of both connectors. When connecting the first and second connectors 9 and 50, the cylindrical portion 30A having the larger outer diameter interferes with the opening peripheral portion of the bottomed insertion hole 70B having the smaller inner diameter. Incorrect connection is prevented.

According to the two-pole connector configured as described above, the male terminal 95 and the female terminal 45 are connected in the pair of bottomed insertion holes 70A and 70B formed in parallel with the partition wall 52 therebetween. The discharge between the pair of connection terminals (95, 45) on the positive electrode side and the pair of connection terminals (95, 45) on the negative electrode side, which are disposed adjacent to each other with the partition wall 52 interposed therebetween, occurs.
2 ensures prevention. In addition, a pair of cylindrical portions 30
A and 30B are formed to have different outer diameters, and a pair of bottomed insertion holes 70A and 70B
A and 30B are formed to correspond to the inner diameters, respectively. Therefore, even if the receptacle-side connector 50 and the module-side connector 9 are erroneously connected to each other with the wrong polarity, the cylindrical portion 30A having the larger outer diameter is the inner diameter. Interferes with the peripheral edge of the opening 70B having the smaller bottomed insertion hole.
50 misconnections are prevented.

Also, the first O-ring 21 is
And the first O-ring 21 is brought into close contact with the inner peripheral surface of the cover portion 58 to achieve waterproofing at the connection portion between the connectors 9 and 50, and within the waterproofed space, each cylindrical portion 30
The second O-ring 22 and the third O-ring 23 attached to the bottomed insertion holes 70A, 70B are brought into close contact with the inner peripheral surfaces of the bottomed insertion holes 70A, 70B, and are waterproofed into the bottomed insertion holes 70A, 70B, and furthermore, each cylindrical portion. Waterproofing inside 30A, 30B is further achieved. Therefore, the connection between the terminals 45 and 95 is double-sealed by the first O-ring 21 or the second O-ring 22 and the third O-ring 23, so that the reliability of the seal is improved. Further, even if the moisture in the gas is liquefied in the space sealed by the first O-ring 21, the respective terminal pairs (45, 95) in the space sealed by the first O-ring 21. Is the second O-ring 2
Since both terminals 45 and 95 are sealed by the second or third O-ring 23, the two terminals 45 and 95
A short circuit between them is prevented.

Further, the second O attached to the cylindrical portion 30A
The ring 22 is colored red and the cylindrical portion 30
While the third O-ring 23 attached to B is colored black, the region corresponding to each of the bottomed insertion holes 70A and 70B on the outer peripheral surface of the receptacle-side housing 51 is
A display portion 54A for a character "+" is provided, and a display portion 54B for a character "-" is provided in an area corresponding to the cylindrical portion 70B.
, The connection direction of the connectors 9 and 50 can be confirmed in advance when connecting the connectors 9 and 50.

Instead of forming the display portions 54A and 54B in a protruding manner, the portions corresponding to the positive pole side and the portions corresponding to the negative pole side of the receptacle side housing 51 are colored differently. Is also good.

The female terminal 45 and the male terminal 95 are connected to the module side housing 10 and the receptacle side housing 51 by the module side retainers 25 and 65.
The female terminal 45 and the male terminal 95 themselves are housed in
It is possible to use a general-purpose device that does not have a special configuration for engaging with the device.

Further, the female terminal 45 is connected to the cylindrical portions 30A, 3A.
Since the male terminal 95 is housed in the bottomed insertion holes 70A and 70B, the female terminal 45 and the male terminal 95 are exposed outside the module-side connector 9 and the receptacle-side connector 50. Never
The operator does not accidentally touch the terminals 45 and 95.

In particular, in this two-pole connector, the male terminal 9
5 male connecting portion 92 has bottomed insertion holes 70A, 70B.
(For example, a test finger specified by JIS is inserted into the bottomed insertion holes 70A, 7A).
When it is inserted into the OB, the distance between the tip of the test finger and the tip of the male connector 92 is at least 2 mm or more, thereby preventing electric shock to the operator.

In this two-pole connector, the cap 1
00 is mounted so as to cover the base end sides of the module-side housing 10 and the receptacle-side housing 51, respectively.
It is also possible to adopt a configuration in which molding is performed on the 51 base end.

The application of the two-pole connector is not limited to the connection between the solar cell modules in the photovoltaic power generation system. The housing 10 and the receptacle-side housing 51 and the cap 1
00 is preferably formed of the following material.

That is, since heat resistance, water resistance, and the like are required on the roof of a house, the module side housing 10 and the receptacle side housing 51 are made of a material that can withstand 100 ° C. or more and does not hydrolyze. For example, it is preferably formed of a modified resin or an unsaturated polyester resin obtained by mixing polyphenylene ether and polypropylene.

The cap 100 is preferably formed of, for example, heat-resistant vinyl chloride resin (PVC) or flame-retardant ethylene propylene rubber (EPDM).

Further, the first to third O-rings 21, 22, 22
23, durometer hardness test (JIS K62
The use of a resin made of an oil-impregnated silicone or a resin such as NBR having a hardness of A60 or less of 53 type A) can reduce the insertion resistance when the module-side connector 9 and the receptacle-side connector 50 are connected.

[0063]

As described above, according to the two-pole connector of the first aspect of the present invention, the male terminal and the female terminal are respectively connected in the pair of bottomed insertion holes formed in parallel with the partition wall therebetween. Since the connection is made, the discharge between the pair of connection terminals on the positive pole side and the negative pole side is prevented by the partition wall. Further, a pair of cylindrical portions formed at a predetermined interval are formed with different outer diameters, and a pair of bottomed insertion holes are formed with inner diameters corresponding to the respective cylindrical portions, Even if the polarity of the connector on the receptacle side and the connector on the module side are incorrectly connected, the cylindrical part with the larger outer diameter interferes with the peripheral edge of the bottomed insertion hole opening on the smaller inner diameter, and the connectors are incorrectly connected. Is prevented.

Further, a first seal member is provided around an annular contact portion between an outer peripheral surface of the base end connecting portion and an inner peripheral surface of the cover portion, and a space sealed by the first seal member. When the second and third seal members are provided around the respective annular contact portions between the outer peripheral surface of each cylindrical member and the inner peripheral surface of the bottomed insertion hole, in the space sealed by the first seal member, A connection terminal pair of a male terminal and a female terminal on one side (for example, a positive pole side) and a connection terminal pair of a male terminal and a female terminal on the other side (for example, a negative pole side) are respectively formed by a second or third seal member. It is in a sealed state. Therefore, for example, when moisture in the gas is liquefied in the space sealed by the first seal member, a short circuit between the two terminal connection pairs is prevented.

Further, the second and third seal members provided on the outer peripheral surface side of each cylindrical member are respectively colored differently, and the outer peripheral surface of the receptacle side housing is provided. By adding a plus or minus sign to each position corresponding to each bottomed insertion hole, you can check the polarity before connecting the receptacle connector and module connector. Becomes

[Brief description of the drawings]

FIG. 1 is a sectional view showing a two-pole connector according to an embodiment of the present invention.

FIG. 2 is a plan view showing a module-side connector housing.

FIG. 3 is a front view of the module-side connector housing.

FIG. 4 is a rear view of the same module side housing.

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a plan view showing a cap.

FIG. 7 is a front view showing the same cap.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

FIG. 9 is a sectional view taken along line IX-IX of FIG. 6;

FIG. 10 is a plan view showing a receptacle-side connector.

FIG. 11 is a front view showing the receptacle-side connector of the same.

FIG. 12 is a rear view showing the receptacle-side connector of the above.

FIG. 13 is a sectional view taken along line XIII-XIII of FIG. 11;

[Explanation of symbols]

 9 Module side connector 10 Module side housing 30A, 30B Cylindrical part 45 Female terminal 50 Receptacle side connector 51 Receptacle side housing 70A, 70B Bottomed insertion hole 95 Male terminal

Claims (3)

[Claims] A module-side housing having a pair of cylindrical portions having different outer diameters formed in parallel at a predetermined distance from each other; and a module-side connector having female terminals housed and arranged in the two cylindrical portions, respectively. A receptacle-side housing in which a pair of bottomed insertion holes each having an inner diameter corresponding to each of the tubular portions is formed in parallel with a partition wall therebetween, and a male terminal housed and arranged in each of the bottomed insertion holes. The receptacle-side connector and the module by inserting the two tubular portions into the two bottomed insertion holes having the corresponding dimensions and connecting the female terminal and the male terminal. A two-pole connector connected to the side connector. 2. A base portion of the cylindrical portions is connected to each other via a base end connection portion, and a cover portion covering the base end connection portion is provided at a front end portion of the receptacle side housing. A first seal member is provided around an annular contact portion between the outer peripheral surface of the base end connecting portion and the inner peripheral surface of the cover portion, and the outer peripheral surface of each tubular member and the inner peripheral surface of each bottomed insertion hole. 2. The two-pole connector according to claim 1, wherein second and third seal members are provided around each annular contact portion of the two-pole connector. 3. The second and third seal members are provided on the outer peripheral surface side of the tubular member, and the second and third seal members are respectively colored differently, and the receptacle side. The two-pole connector according to claim 2, wherein a positive polarity display or a negative polarity display is provided at each position on the outer peripheral surface of the housing corresponding to each of the bottomed insertion holes.