JP2001356041A - Detector adapted to be explosion proof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detector adapted to be explosion proof having costs reduced. SOLUTION: There are included a conductor 7 where an electricity flows and a detecting part 5 set to an end part of the conductor 7. The detecting part 5 and the end part of the conductor 7 of the side where the detecting part is set are inserted in a tubular body 3 with one end part shut. The tubular body 3 is shut by a synthetic resin filled in an end part 8 of the tubular body 3 of the side from which at least the conductor 7 is drawn in. In this constitution, the detector 1 adapted to be explosion proof is formed in an explosion- proof construction, and therefore the need of using a barrier relay and the like equipment is eliminated and costs are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric explosion-proof detector, and more particularly to a detector having a pressure-resistant explosion-proof structure.

[0002]

2. Description of the Related Art A conventional electric explosion-proof detector includes a conductor through which electricity flows, a detector provided at one end of the conductor,
Further, it includes devices such as a barrier relay for electrically connecting the detector to a control circuit and other devices and devices.

[0003]

As described above, the conventional electric explosion-proof detector is a barrier relay for coping with an intrinsically safe explosion-proof structure when electrically connected to a control circuit and other devices and devices. It is necessary to connect to a control circuit, other devices, and devices via devices such as the above, and the cost of the detector is increased by devices such as a barrier relay.

An object of the present invention is to reduce the cost of an electric explosion-proof detector.

[0005]

An electric explosion-proof detector according to the present invention includes a conducting wire through which electricity flows, and a detecting portion provided at an end of the conducting wire. The end on the side where the portion is provided is inserted into a tubular body whose one end is closed, and the tubular body is formed of a synthetic resin material at least on the end of the tubular body on which the lead is drawn. The above-mentioned problem is solved by filling. Further, the detection part and the end of the conductor on the side where the detection part is provided are inserted into the bottomed hole, and the bottomed hole is provided at least at the end of the bottomed hole on which the lead is drawn in. The above problem is solved by being filled with a synthetic resin material.

[0006] With this configuration, the detection portion which may generate an electric spark or the like and the end on the side where the detection portion of the conductive wire is provided have a bottom with a synthetic resin material filled in the opening. It can be a fully closed structure enclosed in a hole or tube. Therefore, the electric explosion-proof detector of the present invention is:
The structure is compatible with the explosion-proof structure, and when electrically connected to the control circuit and other devices and devices, there is no need to connect via devices such as barrier relays, and devices such as barrier relays are unnecessary. Therefore, the cost of an electric explosion-proof detector can be reduced.

Furthermore, if the tube is made of metal or the bottomed hole is defined by a metal wall, and the synthetic resin material is entirely filled in the tube or the bottomed hole, It is possible to insulate the detecting portion or the conductor from the tube or the bottomed hole with a synthetic resin material. Therefore, the internal volume of the tube or the bottomed hole can be reduced, and the reference value of the internal pressure with respect to the pressure-resistant explosion-proof structure can be lowered, which facilitates the production, which is preferable.

Further, the present invention provides a detector having the above explosion-proof structure, wherein the detector comprises a reed switch, has a magnet, and has a float movable along a tube. Further, it is a detector provided with the above-mentioned explosion-proof structure, and is a temperature detector that detects a temperature based on an electrical change of the detection unit.

Further, if the liquid level detector is a liquefied gas evaporator installed in a tank containing a heat medium for heating a heat exchanger through which the liquefied gas flows, the liquefied gas evaporator can be used. This is preferable because the cost can be reduced.

Incidentally, in the conventional liquefied gas evaporator,
An expansion-type temperature detector is used as the temperature detector. The inflatable temperature detector includes a heat sensitive tube, a body connected to one end of the heat sensitive tube and having a contact which is activated by expansion of a liquid or the like sealed in the heat sensitive tube. The expansion-type temperature detector has a contact that opens and closes in accordance with a set temperature at one point. Therefore, in the conventional liquefied gas evaporator, a main thermo switch for controlling the on / off of the heating means to manage a heating state for evaporating the liquefied gas, a low temperature state in which the liquefied gas is not sufficiently evaporated. Multiple temperature detectors must be provided, such as a low-thermo switch for detection. In addition, when the expansion type temperature detector is installed in the liquefied gas evaporator and the temperature detector and the control unit of the liquefied gas evaporator are electrically connected, a terminal block corresponding to the intrinsically safe explosion-proof structure is provided on the main body. The conductor from the terminal block is connected to the control unit via devices such as a barrier relay. As described above, the conventional liquefied gas evaporator requires a plurality of temperature detectors, and further requires a plurality of devices such as a terminal block and a barrier relay corresponding to an intrinsically safe explosion-proof structure according to the number of the temperature detectors. is there. Therefore, the cost of the liquefied gas evaporator is increased.

On the other hand, the liquefied gas evaporator of the present invention uses a temperature detector provided with the above-described pressure-resistant explosion-proof structure for detecting the temperature based on the electric change of the detecting section, to convert the liquid-phase liquefied gas. It is provided in an evaporator for heating and evaporating. According to such a configuration, the temperature detector detects the temperature based on the electrical change of the detection unit, so that the temperature change can be continuously detected. It can handle a plurality of thermoswitches. further,
The detector and the end of the conductor on the side where the detector is provided have an explosion-proof structure sealed in a bottomed hole or tube with synthetic resin material filled in the opening, so intrinsic safety Equipment such as terminal blocks and barrier relays compatible with explosion-proof construction is not required. Therefore, the cost of the liquefied gas evaporator can be reduced. Furthermore, it is preferable that the temperature detector be a thermistor so that the temperature can be detected with high accuracy.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of an electric explosion-proof detector according to the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing a schematic configuration of a temperature detector which is an electric explosion-proof detector to which the present invention is applied. FIG. 2 is a sectional view showing a schematic configuration of a liquid level detector which is an electric explosion-proof detector to which the present invention is applied. FIG. 3 is a diagram illustrating a schematic configuration of a liquefied gas evaporator including the temperature detector and the liquid level detector according to the present embodiment. In this embodiment, the electric explosion-proof detectors are a temperature detector and a liquid level detector,
A case where these temperature detector and liquid level detector are used in a liquefied gas evaporator will be described as an example.

As shown in FIG. 1, the temperature detector 1 of the present embodiment includes a protective tube 3, a thermistor 5, which is a detecting portion, a conductor 7, a synthetic resin material 9, and the like. The protective tube 3 has a metal tube whose one end is closed, and a top plate 15 of a tank 13 containing a heat medium 11 of a liquefied gas evaporator.
Attached to. The conductor 7 and the thermistor 5 attached to the end of the conductor 7 are inserted into the protection tube 3 so as not to touch the wall surface of the protection tube 3. An end portion 8 of the protection tube 3 on the side where the lead wire 7 is drawn is filled with a synthetic resin material 9 so as to fill a space between the periphery of the lead wire 7 and the inner surface of the end portion 8 and is in a hardened state. That is, the cured synthetic resin material 9 is fixed to the periphery of the conductor 7 and the end 8 of the protective tube 3.

As shown in FIG. 2, the liquid level detector 17 of the present embodiment includes a protection tube 19, a reed switch 2 serving as a detection unit.
1, a conductor 23, a synthetic resin material 25, a float 27, a magnet 29 and the like. The protection tube 19
One end is closed by a metal tube, and attached to a top plate 15 of a tank 13 containing a heat medium 11 of a liquefied gas evaporator. The conductor 23 and the reed switch 21 attached to the end of the conductor 23 are inserted into the protection tube 19 so as not to touch the wall surface of the protection tube 19. A portion of the conductor 23 located outside the top plate 15 of the tank 13 is covered with a sheath 31 for bundling the conductor 23 composed of a plurality of electric wires.

An end of the protective tube 19 on the side where the lead wire 23 is drawn in is a cylindrical protrusion 32 protruding from the top plate 15 outside the tank 13, and the protrusion 32 has a sheath of the lead wire 23. The synthetic resin material 25 is filled and hardened so as to fill the space between the periphery 31 and the inner surface of the protrusion 32.
That is, the cured synthetic resin material 25 is fixed to the periphery of the sheath 31 and to the protrusion 32 of the opening of the protective tube 19. The protection tube 19 is inserted into a through hole formed at the center of a hollow, substantially cylindrical float 23, and the float 23 can move along the protection tube 19. On the outer surface of the protection tube 19, a float 23 is provided.
A projection 33 is provided for defining the range of movement. A ring-shaped magnet 29 is attached to the inner bottom of the float 23.

The protective tubes 3 and 19 can be made of various materials such as stainless steel and other alloy steels, for example. It is preferable to use a material capable of forming a tube, and furthermore, a material having corrosion resistance and heat conductivity. Various synthetic resin materials can be used for the synthetic resin materials 9 and 25. However, the conductive wires 7 are required to satisfy the internal pressure resistance standard of the pressure-resistant explosion-proof structure when cured.
A material that sufficiently adheres to the periphery of the protective tube 3 and the opening of the protective tube 3 and to the periphery of the sheath 31 and the opening of the protective tube 19 is used. Thus, the temperature detector 1 of the present embodiment
The liquid level detector 17 has a pressure-resistant explosion-proof structure.

The temperature detector 1 and the liquid level detector 1 of the present embodiment
As shown in FIG. 3, the liquefied gas evaporator provided with
It comprises a combustion section 35, an evaporating section 37, a control section 39 and the like. The combustion unit 35 includes a blower 45, which is a gas supply unit that supplies a protective gas to the electric device chamber 41 and the combustion chamber 43, which are internal pressure vessels, a protective gas to the electric device room 41, the combustion chamber 43, and the like, and a fuel that supplies fuel. Supply pipe 49, fuel supply pipe 4
9, a gas valve 51 comprising an electromagnetic valve and a regulating valve 5
3. It is provided with an ignition 55, a frame rod 57 and the like for igniting the fuel. The electrical equipment room 41 and the combustion chamber 43 communicate with each other via an air chamber 59. The electrical equipment room 41 and the air chamber 59 are provided with an opening 6 formed in a part of a partition wall 61 that separates the electrical equipment room 41 and the air chamber 59.
3 communicates. A fuel supply pipe 49 is inserted into the electrical equipment room 41 and the air chamber 59.
The end 65 on the side from which the fuel is ejected is open in the combustion chamber 43.

Outside the electrical equipment room 41, the electrical equipment room 4
A pressure switch 67 is provided which operates when the pressure difference between the inside and outside of the pressure sensor 1 exceeds a predetermined pressure difference and outputs a signal. The pressure switch 67 uses a pressure-resistant explosion-proof structure. Air chamber 59 and combustion chamber 43
The communication part 7 formed around the end 65 of the fuel supply pipe 49 of the partition wall 69 that partitions the air chamber 59 and the combustion chamber 43.
It communicates with 1. The blower 45 is an explosion-proof blower, and the blower tube 73 of the blower 45 communicates with the air chamber 59 of the electric equipment room 41 on the opposite side, that is, on the upstream side with respect to the flow of the protective gas in the electric equipment room 41. ing. An intake port 75 of the blower 45 communicates with an intake pipe 77. Exhaust pipe 47
Communicates with the portion of the combustion chamber 43 opposite to the air chamber 59, that is, downstream of the flow of the protective gas in the combustion chamber 43. The intake port 79 of the intake pipe 77 and the exhaust port 81 of the exhaust pipe 47 open to the non-dangerous area 83, respectively.
Therefore, in this embodiment, clean air is used as the protective gas, and this air is also used as combustion air.

The control section 39 is installed in an electrical box 83 which is a box having a pressure-resistant explosion-proof structure. Evaporation section 3
Reference numeral 7 denotes a tank in which the combustion chamber 43 of the combustion section 35 is disposed, a tank 13 in which the heat medium 85 is accommodated, and a pipe through which the liquefied gas flows, and is disposed so as to be partially immersed in the heat medium 85. A heat exchanger 87, a temperature detector 1 for detecting the temperature of the heat medium, a liquid level detector 17 for detecting the water level of the heat medium, and the like. The liquefied gas evaporator of the present embodiment heats the liquefied gas in the liquid phase flowing through the heat exchanger 87, for example, liquefied petroleum gas (LPG) or liquefied natural gas (LNG) by the combustion unit 35. LPG or L in the gas phase is evaporated by the heat of the medium 85.
NG is obtained. Further, the combustion section 35 uses LPG, LNG, or the like as fuel.

Accordingly, the electric box 30 containing the combustion section 35, the evaporating section 37, and the control section 39, which constitute the liquefied gas evaporating apparatus, is located in a dangerous place 89. The electric box 30, the blower 45, the pressure switch 67, and the gas valve 5 in an internal pressure vessel such as the electrical equipment room 41
1, the wiring 91 for electrically connecting the ignition 55, the frame rod 57 and the like, the wiring for electrically connecting the electrical box 30 to the temperature detector 1 and the liquid level detector 17, that is, the conductors 7 and 23 , Explosion-proof wiring. The wiring 91 is electrically connected to the gas valve 51, the ignition 55, the frame rod 57, and the like via a wiring 93 which is a normal wiring electrically connected to the wiring 91 in an internal pressure vessel such as the electric equipment room 41. It is connected to the. When the electrical box 30 is electrically connected to the temperature detector 1 and the liquid level detector 17, the temperature detector 1 and the liquid level detector 17 correspond to a flameproof structure.
The conductors 7 and 23 are connected to the electrical box 30 without using devices such as barrier relays.

Here, in the temperature detector 1 of the present embodiment,
A temperature detection circuit for detecting a temperature based on a change in the resistance value of the thermistor 5 due to a temperature change is incorporated in a control unit 39 which controls the operation of the combustion unit 35 of the liquefied gas evaporator. Then, the temperature detector 1 of the present embodiment turns off the combustion unit 35 via the control unit 39 when the temperature becomes equal to or higher than the set temperature in order to keep the temperature of the heat medium 85 substantially constant.
A main thermo switch that turns on the combustion unit 35 via the control unit 39 when the temperature becomes lower than the set temperature, and an alarm or the like via the control unit 39 that the temperature of the heat medium 85 has decreased to a level at which the liquefied gas cannot be sufficiently evaporated. It plays the role of a low switch that emits and informs you of abnormalities.

On the other hand, when the heat medium 85 is at a predetermined liquid level position, the liquid level detector 17 of this embodiment
The magnetic force of the magnet 29 provided in the reed switch 2
Since the reed switch 21 is in a conductive state to act on the first position, it is detected that the heat medium 85 is filled to a normal liquid level position. When the heat medium 85 falls below a predetermined liquid level, the float 27 moves downward and the magnet 2
9 does not act on the reed switch 21,
When the reed switch 21 becomes non-conductive, it detects that the liquid level of the heat medium 85 has dropped. Thereby, an operation such as issuing an alarm or the like through the control unit 39 to notify the abnormality or stopping the operation of the combustion unit 35 can be performed. When the liquid level of the heat medium 85 becomes higher than the normal liquid level position due to replenishment of the heat medium 85 or the like, the float 2
7 moves upward and the magnetic force of the magnet 29 acts on the reed switch 21.
1 is again brought into the conducting state, thereby detecting that the heat medium 85 is filled to the normal liquid level position.

As described above, in the temperature detector 1 and the liquid level detector 17 which are the electric explosion-proof detectors of the present embodiment, portions which may generate an electric spark, such as the thermistor 5 and the reed switch 21, are provided. And the protection tubes 3 and 19 having the resistance to a predetermined internal pressure, and the protection tubes 3 and 19 have the end portions of the conducting wires 7 and 23 provided with the detection portions.
And the synthetic resin material packed in the end portions 8 and the protruding portions 32. Therefore, when the temperature detector 1 and the liquid level detector 17 are electrically connected to the control unit 39, the conductors 7 and 23 are directly connected to the control unit 39 without using devices such as barrier relays. Can be connected to
Therefore, devices such as barrier relays become unnecessary,
The cost of an electric explosion-proof detector can be reduced.

Further, when a commercially available barrier relay is used, since the terminal shape on the barrier relay side is single, it is necessary to perform wiring work so as to prevent erroneous wiring, and the wiring work cannot be performed efficiently. However, in the present embodiment, since a barrier relay becomes unnecessary, various shaped terminals can be used for wiring, and erroneous wiring can be easily prevented, so that wiring work can be performed efficiently. In addition, since there is no wiring via the barrier relay, the number of wirings is reduced and the number of work steps for connecting the detector to other devices can be reduced. In addition, when it is desired to use devices such as a barrier relay, and when the control unit and the devices such as a barrier relay are stored in one electrical box, the electrical box becomes large.
In the present embodiment, since the barrier relay becomes unnecessary, only the control unit 39 needs to be housed in the electrical box 83, and the electrical box can be downsized.

Further, as exemplified in the present embodiment, if the liquefied gas evaporator provided with the temperature detector 1 and the liquid level detector 17 of the present embodiment corresponding to the explosion-proof structure, etc., the liquefied gas evaporator Therefore, equipment such as a barrier relay can be eliminated from the apparatus, and the cost of the liquefied gas evaporator can be reduced. In addition, the heating medium 8 around the evaporating section 37 is heated.
In the conventional liquefied gas evaporator, water droplets condensed in the conductor may travel along the conductor to reach the detection unit made of an electric component such as a reed switch, which may cause a failure of the detection unit. However, in the liquefied gas evaporator exemplified in the present embodiment, the temperature detector 1 and the liquid level detector 17 are in a state in which the protective tubes 3 and 19 are sealed with the synthetic resin materials 9 and 25, respectively. Since water droplets do not reach the detection unit as in the related art, problems in temperature detection and liquid level detection hardly occur, and the reliability of the device can be improved.

In the conventional liquefied gas evaporator,
An expansion-type temperature detector is used as the temperature detector. The inflatable temperature detector includes a heat sensitive tube, a body connected to one end of the heat sensitive tube and having a contact which is activated by expansion of a liquid or the like sealed in the heat sensitive tube. The expansion-type temperature detector has a contact that opens and closes in accordance with a set temperature at one point. Therefore, in the conventional liquefied gas evaporator, a main thermo switch for controlling the on / off of the heating means to manage a heating state for evaporating the liquefied gas, a low temperature state in which the liquefied gas is not sufficiently evaporated. Multiple temperature detectors must be provided, such as a low-thermo switch for detection. In addition, when the expansion type temperature detector is installed in the liquefied gas evaporator and the temperature detector and the control unit of the liquefied gas evaporator are electrically connected, a terminal block corresponding to the intrinsically safe explosion-proof structure is provided on the main body. The conductor from the terminal block is connected to the control unit via devices such as a barrier relay. As described above, the conventional liquefied gas evaporator requires a plurality of temperature detectors, and further requires a plurality of devices such as a terminal block and a barrier relay corresponding to an intrinsically safe explosion-proof structure depending on whether or not the temperature detector is used. is there. Therefore, the cost of the liquefied gas evaporator is increasing.

On the other hand, the temperature detector 1 of the present embodiment
Since the detection unit is a thermistor 5 capable of continuously detecting a temperature change, if a liquefied gas evaporator equipped with the temperature detector 1 is used, the role of a main thermoswitch, a low thermoswitch, etc., is taken as one temperature. Can be performed by the detector 1,
The number of temperature detectors can be reduced. In addition, since the temperature detector 1 of the present embodiment has a pressure-resistant explosion-proof structure, if a liquefied gas evaporator equipped with the temperature detector 1 is used, the temperature detector 1 is controlled via devices such as a barrier relay. Part 39
No need to connect to. Therefore, if a liquefied gas evaporator equipped with the temperature detector 1 of the present embodiment is used, the cost of the apparatus can be reduced. In addition, it is easy to change the setting of the detected temperature.

Further, in this embodiment, the liquefied gas evaporating apparatus for heating the heat medium 85 to perform heat exchange and evaporate the liquefied gas in the liquid phase to obtain the liquefied gas in the gaseous phase has been described. The electric explosion-proof detector is not limited to this and can be applied to liquefied gas evaporators of various configurations. For example, in a liquefied gas evaporator provided with an evaporator for evaporating a liquefied gas in a liquid phase by covering a flow path through which a liquefied gas flows with a heat transfer block and heating the heat transfer block, A bottomed hole is formed in the bottomed hole, and the detecting section and the end of the conducting wire provided with the detecting section are inserted into the bottomed hole, and the synthetic resin material is packed into the end on the side where the conducting wire of the bottomed hole is drawn in. It can also be set as a simple structure.

Further, in the liquefied gas evaporator exemplified in this embodiment, the pressure switch 67 having the explosion-proof structure is used. However, a normal pressure switch which does not correspond to the explosion-proof structure can be used. In this case, in order to connect the pressure switch to a control unit or the like, equipment such as a barrier relay is required in order to support an intrinsically safe explosion-proof structure. However, even in a liquefied gas evaporator equipped with such a normal pressure switch, equipment such as a barrier relay for a temperature detector and a liquid level detector is not required, so that the apparatus cost can be reduced.

In the present embodiment, the temperature detector 1 provided in the liquefied gas evaporator as an electric explosion-proof detector is provided.
Although the liquid level detector 17 has been described, the present invention is not limited to this, and can be applied to various electric explosion-proof detectors provided in various apparatuses and devices. Second Embodiment A second embodiment of an electric explosion-proof detector according to the present invention will be described with reference to FIG. FIG. 4 is a sectional view showing a schematic configuration of a temperature detector which is an electric explosion-proof detector to which the present invention is applied. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and the configuration and features different from those in the first embodiment will be described.

The temperature detector of the present embodiment is different from the temperature detector 1 of the first embodiment in that the diameter of the protective tube, the configuration of the end of the protective tube on which the conductor is drawn, and the synthetic resin material At the filling site. That is, the temperature detector 9 of the present embodiment
In FIG. 5, the end of the protective tube 97 on the side where the lead is drawn is a cap portion 99, and the cap portion 99 is a substantially concave filling portion 10 having a through hole on the bottom surface.
3. It has a connecting portion 105 for connecting to the protection tube 97 and the like. The protective tube 97 is filled with a synthetic resin material 107 throughout the protective tube 97 except for the cap portion 99.
The filling portion 103 of the cap 99 of the protection tube 97 is filled with a synthetic resin material 109.

The cap portion 99 can be made of various materials, but is preferably made of a material having corrosion resistance such as stainless steel. Although various synthetic resin materials can be used for the synthetic resin material 107, the surface of the conductor 7 and the thermistor 5 and the protective tube are so set as to meet the internal pressure resistance standard of the explosion-proof structure when cured. 97 is made of a material that is sufficiently fixed to the inner surface of the
A material having an insulating property, for example, an epoxy resin or a silicon resin is used to insulate the semiconductor device from the thermistor 5. The synthetic resin material 107 is preferably a material having thermal conductivity. Various synthetic resin materials can be used for the synthetic resin material 109. However, the periphery of the lead wire 7 and the filling portion 103 of the cap 99 are filled so as to satisfy the standard for resistance to the internal pressure of the explosion-proof structure when cured. A material that sufficiently adheres to the inner surface is used. The same synthetic resin material can be used for the synthetic resin materials 107 and 109.

In this embodiment, the entirety of the protection tube 97 is filled with the synthetic resin material 107 to insulate the protection tube 97 and the thermistor 5 from each other. In comparison, the distance between the protection tube 97 and the thermistor 5 can be reduced, and the diameter of the protection tube 97 can be made smaller than the diameter of the protection tube 3 of the temperature detector 1 of the first embodiment. Therefore, the internal volume of the protection tube can be reduced.

Here, in the pressure-resistant explosion-proof structure, the reference value of the resistance to the internal pressure is determined according to the internal volume. When the internal volume is small, the reference value of the resistance to the internal pressure is low. Therefore, in the temperature detector 95 of the present embodiment, since the internal volume of the protective tube 97 can be reduced, the reference value of the resistance against the internal pressure required in the pressure-resistant explosion-proof structure is reduced, and the production and the management of the production are easy. become.

In the present embodiment, the temperature detector 95 has been described.
The configuration filled with 7 can also be applied to the temperature detector 1 and the liquid level detector 17 of the first embodiment and other electric explosion-proof detectors.

Further, in the temperature detectors 1 and 95 of the first and second embodiments, the thermistor 5 is used as the detection unit, but an electric detection unit other than the thermistor such as a thermocouple may be used. However, it is preferable to use a thermistor because temperature measurement can be performed with higher accuracy than other detection units.

[0037]

According to the present invention, the cost of an electric explosion-proof detector can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a first embodiment of a temperature detector which is an electric explosion-proof detector to which the present invention is applied.

FIG. 2 is a diagram showing a schematic configuration of an embodiment of a liquid level detector which is an electric explosion-proof detector to which the present invention is applied.

FIG. 3 is a diagram illustrating a schematic configuration of a liquefied gas evaporator including a temperature detector and a liquid level detector according to the present embodiment.

FIG. 4 is a diagram showing a schematic configuration of a second embodiment of a temperature detector which is an electric explosion-proof detector to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Temperature detector 3 Protection tube (tube) 5 Thermistor (detection part) 7 Conductor 9 Synthetic resin material

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshiaki Ban 23 Minami-Kashima, Futamata-cho, Tenryu-shi, Shizuoka Inside Yazaki Keiki Co., Ltd. (72) Inventor Takashi Hosoda 23 Minami-Kashima, Futama-cho, Tenryu-shi, Shizuoka 23 Terms (reference) 2F013 AA02 AA05 AA08 BC02 CA08 CB02 2F056 QC04 QC05 QC09 QC11

Claims (9)

[Claims] 1. A conductor including a conductor through which electricity flows, and a detector provided at an end of the conductor, wherein the detector and one end of the conductor on which the detector is provided are connected to one side. Is inserted into a closed tube at an end thereof, and the tube is closed with a synthetic resin material filled at least at an end of the tube at a side where the conductor is drawn in. Detector. 2. The electric explosion-proof detector according to claim 1, wherein the tube is made of metal, and the synthetic resin material is filled in the entire tube. 3. A conductor including a conductor through which electricity flows, and a detector provided at an end of the conductor, wherein the detector and the end of the conductor on the side where the detector is provided have an An electric explosion-proof detector, which is inserted into a bottom hole, wherein the bottomed hole is filled with a synthetic resin material at least at an end of the bottomed hole where the conductive wire is drawn in. 4. An electric explosion-proof detector according to claim 3, wherein the bottomed hole is defined by a metal wall, and the synthetic resin material is filled in the entire bottomed hole. . 5. A liquid detector having the explosion-proof structure according to claim 1 or 2, wherein the liquid detector comprises a reed switch, has a magnet, and has a float movable along the tubular body. Surface detector. 6. A temperature detector comprising the pressure-resistant explosion-proof structure according to claim 1, wherein the temperature is detected based on an electrical change of the detection unit. 7. A liquefied gas evaporator, wherein the liquid level detector according to claim 5 is installed in a tank containing a heat medium for heating a heat exchanger through which the liquefied gas flows. 8. A liquefied gas evaporator comprising the temperature detector according to claim 6 in an evaporator for heating and evaporating a liquefied gas in a liquid phase. 9. The liquefied gas evaporator according to claim 8, wherein the detection section of the temperature detector is a thermistor.