JP5220686B2 - Steam generator safety structure - Google Patents

Description

  The present invention relates to a safety structure of a steam generator.

  As a steam generator, there is a hot water heater of an automotive air conditioning control device disclosed in JP-A-10-287123 (Patent Document 1). As shown in FIG. 3, the hot water heater includes a hot water tank 1 that stores a predetermined amount of hot water and an electric heater 2 that heats the hot water in the hot water tank 1. Here, when the electric heater 2 is energized, a heating element made of nichrome wire or the like inside the electric heater 2 generates heat, and the hot water is heated by this heat. Usually, the amount of hot water is kept in the hot water tank 1 so that the heat generating part of the electric heater 2 is in the hot water. The water level of the hot water tank 1 is detected by the thermistor 3. The thermistor 3 is housed in a thermistor case 4, and the thermistor case 4 is hermetically attached so that hot water does not enter the upper surface of the hot water tank 1, and a lead-out portion of the lead wire 5 is disposed outside the hot water tank 1. .

  The water level of the warm water is normally at the water level A in the warm water tank 1, and the thermistor case 4 is in the warm water. The temperature of the thermistor 3 rises as the water level falls and the degree of exposure of the thermistor case 4 increases. When the temperature reaches 110 ° C. or higher, the energization of the electric heater 2 is cut off. Reference numeral 6 denotes a pump.

  Although not a conventional technique, in addition to the thermistor as the water level detection device, a thermostat as a high-temperature safety shut-off device that shuts off the power to the electric heater when the water temperature exceeds a set temperature using a bimetal mechanism or the like is provided. There is a steam generator. FIG. 4 is a perspective view of a steam generator provided with the thermistor and the thermostat. 5 is a cross-sectional view taken along the line AA ′ in FIG.

  4 and 5, the steam generation device 11 has a pot 12 that is formed in a pot shape and stores water, and a cover portion 13 that covers an opening at the top of the pot 12, and is formed around the pot 12. By tightening and fixing the flange portion 12a and the flange portion 13a formed around the cover portion 13 with a screw 14, water in the pot 12 is prevented from leaking to the outside.

  In the pot 12, a sheathed heater 15 in which a coiled heating wire is enclosed in a metal pipe is installed in a spiral shape, and both end portions 15 a and 15 b of the sheathed heater 15 are inserted through holes provided in the cover portion 13. 16 is exposed to the outside. The periphery of both end portions 15 a and 15 b of the sheathed heater 15 in the insertion hole 16 is closed from the inside by a lid member 17.

  A mounting opening 18 is provided in the cover portion 13 along with the insertion hole 16. Around the mounting opening 18, a flange of a mounting bracket 21 that is formed of a metal in a concave shape (a bowl shape) and has a thermistor 19 and a thermostat 20 attached to the bottom is an upper side of the thermistor 19 and the thermostat 20. It is attached and fixed by screws 22 from the inside so that the (terminal side) is exposed to the outside from the attachment opening 18.

  A commercial 100V AC power supply is connected to the terminals 20a and 20b of the thermostat 20, and the power to the sheathed heater 15 is cut off when the water temperature in the pot 12 exceeds the set abnormal temperature.

  However, the steam generator provided with the thermistor 19 and the thermostat 20 as shown in FIGS. 4 and 5 has the following problems.

  That is, the cover portion 13 is formed by molding with a resin together with a cylindrical steam supply passage 23 for supplying generated steam to a necessary portion. The thermostat 20 as the high-temperature safety shut-off device is installed in the vicinity of the sheathed heater 15 so as to reliably detect abnormal heat generation. Accordingly, a metal mounting bracket 21 to which the thermistor 19 and the thermostat 20 are mounted is attached to the resin cover portion 13 in close contact with the screw 22 at the beginning. However, since the heat from the sheathed heater 15 is transmitted to the cover portion 13 via the mounting bracket 21, distortion occurs around the mounting opening 18 in the cover portion 13 due to aging, and the resin cover portion 13 and the metal cover portion 13 are made of metal. There may be a gap between the flange of the mounting bracket 21. In that case, the boiling hot water leaks from the gap and flows entirely into the mounting bracket 21 that is located below the cover portion 13 and has a recess, and the thermostat 20 that operates at an AC voltage of 100 V is short-circuited. There is a possibility of fire.

JP-A-10-287123

  Accordingly, an object of the present invention is to provide a safety structure for a steam generator that can prevent an electrical component attached to the mounting bracket from being short-circuited even if hot water leaks between the resin cover and the metal mounting bracket. Is to provide.

In order to solve the above problems, the safety structure of the steam generator of the present invention is:
A pot for storing water with an opening at the top;
A heater for steam generation that is installed in the pot and heats water in the pot;
A high-temperature safety shut-off device that operates at a commercial voltage, detects that the temperature of water in the pot has reached a preset abnormal temperature, and shuts off the power to the steam generating heater,
Covering the opening of the pot, and a cover portion provided with an attachment opening for attaching the high-temperature safety shut-off device;
It is formed in a substantially concave shape with metal, the high temperature safety shut-off device is attached to the bottom, and the mounting bracket is attached to the mounting opening of the cover part from the outside,
The mounting bracket is
A main body having a concave shape, a flange extending radially outward from an annular edge of the main body, and a rib extending so as to protrude from the front end side of the flange to the side opposite to the bottom side;
The flange is attached to the attachment opening by being attached around the attachment opening on the surface of the cover portion.

  According to the above-described configuration, the mounting bracket that is formed in a substantially concave shape with metal and that has the high-temperature safety shut-off device attached to the bottom is attached to the mounting opening of the cover portion that covers the opening of the pot for collecting water from the outside (upper side). The flange of the mounting bracket is mounted, and is mounted around the mounting opening on the surface of the cover portion, and the high-temperature safety shut-off device is mounted on the cover portion.

  In that case, the cover portion is made of resin, and distortion occurs around the mounting opening in the cover portion due to secular change due to heat transmitted from the steam generating heater to the cover portion via the mounting bracket, Even if a gap is formed between the resin cover part and the flange of the metal mounting bracket, and the hot water in the pot leaks from the gap, the flange as a mounting surface to the cover part Hot water that flows into the mounting bracket is blocked by a rib that protrudes from the front end side to the side opposite to the bottom side and extends at a position where the front end is higher than the mounting surface. Therefore, leaked hot water can be prevented from flowing into the substantially concave mounting bracket, and a high-temperature safety shut-off device operating at commercial voltage attached to the bottom of the mounting bracket can be prevented from short-circuiting to cause a fire or the like. it can.

The safety structure of the steam generator of the present invention is
In addition to the high-temperature safety shut-off device, the bottom of the mounting bracket detects that the temperature of the water in the pot has reached a preset temperature lower than the preset abnormal temperature, and generates the steam. A water temperature detection device for turning off the heater is attached.

  According to this embodiment, even if a gap is formed between the resin cover part and the metal mounting bracket, and the hot water in the pot leaks from the gap, the leaked hot water is concave. Can be prevented from flowing into the mounting bracket. Therefore, in addition to the high-temperature safety shut-off device, it is possible to prevent the water temperature detection device attached to the bottom of the mounting bracket from being short-circuited and becoming inoperable.

The safety structure of the steam generator of the present invention is
A cylindrical main body formed of metal and mounted with the mounting bracket, a flange extending radially outward from an annular edge of the main body, and protruding from the front end side of the flange to the main body side And an annular member that is attached to the mounting opening from the outside,
Around the mounting opening on the surface of the cover portion, a groove into which the rib of the annular member attached to the mounting opening from the outside is inserted is formed.
The mounting bracket is mounted on the annular member mounted on the mounting opening from the outside, and the mounting opening is attached to the surface of the cover portion via the flange of the annular member. It is attached to.

  According to this embodiment, the metal annular member is interposed between the mounting bracket and the cover portion. Therefore, a part of the heat transferred from the steam generating heater to the cover part via the mounting bracket can be dispersed by the metal annular member. In this way, the temperature rise of the cover part can be suppressed, and distortion generated around the mounting opening in the cover part can be suppressed.

  Furthermore, when the annular member is provided with a rib projecting and extending from the front end side of the flange to the main body side, the rib is attached to the surface of the cover portion when the annular member is attached to the mounting opening from the outside. It is inserted into a groove formed around the mounting opening. Therefore, when the distortion generated around the mounting opening in the cover part is slight, the rib of the annular member can be prevented from being separated from the cover part. As a result, when the distortion is slight, the hot water in the pot can be prevented from leaking from between the flange of the annular member and the cover portion.

  As is clear from the above, the safety structure of the steam generator according to the present invention is made of a metal and has a substantially concave shape. Since the high-temperature safety shut-off device is attached to the cover portion by attaching the mounting opening of the cover portion to be closed from the outside and attaching the flange of the mounting bracket around the attachment opening on the surface of the cover portion, the cover portion Is made of resin, and a distortion occurs around the mounting opening in the cover part, and a gap is formed between the resin cover part and the flange of the metal mounting bracket. Even if the hot water leaks, the mounting is performed by the rib extending from the front end side of the flange, which is the mounting surface to the cover portion, to the side opposite to the bottom side. It is possible to block the hot water to be flow into the ingredients.

  Therefore, leaked hot water can be prevented from flowing into the substantially concave mounting bracket, and a high-temperature safety shut-off device that operates at the commercial voltage attached to the bottom surface of the mounting bracket can be prevented from short-circuiting to cause a fire or the like. it can.

It is an external appearance perspective view in the safety structure of the steam generator of this invention. It is BB 'arrow sectional drawing in FIG. It is a block diagram of the hot water heater of the conventional air conditioning control apparatus for motor vehicles. It is a perspective view of the steam generator provided with the thermistor and the thermostat. It is AA 'arrow sectional drawing in FIG.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is an external perspective view of the safety structure of the steam generator according to the present embodiment. 2 is a cross-sectional view taken along the line BB ′ in FIG.

  As shown in FIGS. 1 and 2, a pot 32, a cover portion 33, a flange portion 32a, a flange portion 33a, a screw 34, a sheathed heater 35, and end portions 35a, 35b of the sheathed heater in the steam generator 31 of the present embodiment. , The insertion hole 36, the lid member 37, the mounting opening 38 and the steam supply passage 39 are formed in the pot 12, the cover part 13, the flange part 12a, the flange part 13a, the screw 14, and the sheath in the steam generator 11 shown in FIGS. Since it has the same configuration as the heater 15, the end portions 15 a and 15 b of the sheathed heater, the insertion hole 16, the lid member 17, the mounting opening 18 and the steam supply passage 23, detailed description is omitted.

  The mounting opening 38 provided in the cover part 33 is formed in a concave shape (saddle shape) with metal, and the thermistor 42 is attached to the upper stage (upper bottom part) 41a of the bottom part formed in two stages. A mounting bracket 40 to which a thermostat 43 is mounted is attached and fixed to the lower stage (lower stage bottom) 41b. Thus, the thermistor 42 and the thermostat 43 are attached to the cover portion 33 with their terminal sides exposed to the outside from the attachment opening 38.

  A commercial 100V AC power supply is connected to the terminals 43a and 43b of the thermostat 43, and the power of the sheathed heater 35 is cut off when the water temperature in the pot 32 is higher than a preset abnormal temperature. .

  The mounting bracket 40 in the present embodiment is provided with a flange 44 extending radially outward from an annular edge of a concave (saddle-shaped) main body, and the distal end of the flange 44 is the above-mentioned The rib 45 is formed by being bent at a substantially right angle on the side (upper side) opposite to the bottom side.

  When mounting the mounting bracket 40 having the above configuration in the mounting opening 38, it is performed as follows. First, a cylindrical main body having an outer periphery of the same shape as the inner periphery of the mounting opening 38, a flange extending radially outward from an annular edge of the main body and having a shape substantially the same as the flange 44, A metal annular member 46 having a rib formed by bending the front end portion of the flange to the main body side at a substantially right angle is attached to the attachment opening 38 from the outside (upper side). In that case, the rib of the annular member 46 is press-fitted into a groove formed around the attachment opening 38 on the surface of the cover portion 33, and the flange of the annular member 46 is brought into close contact with the cover portion 33. Then, the mounting bracket 40 is mounted in the annular member 46 from the outside (upper side), overlapped with the flange of the annular member 46 and the flange 44 of the mounting bracket 40, and fixed to the cover portion 33 with the stud screw 47. .

  Thus, the metal annular member 46 is sandwiched between the mounting bracket 40 and the cover portion 33. Therefore, the mounting bracket 40 is removed from the sheathed heater 35 even when the lower bottom portion 41b of the mounting bracket 40 is disposed in the vicinity of the sheathed heater 35 so that the thermostat 43 as the high-temperature safety shut-off device can reliably detect abnormal heat generation. Part of the heat transmitted to the resin cover portion 33 can be dispersed by the metal annular member 46, and the temperature rise of the cover portion 33 can be suppressed.

  Further, the lower part and the periphery of the sheathed heater 35 are surrounded by metal plates 48a and 48b. By doing so, part of the heat transmitted from the sheathed heater 35 to the resin cover portion 33 can be dispersed by the metal metal plates 48a and 48b, and the temperature rise of the cover portion 33 can be suppressed. In this way, the resin cover portion 33 is prevented from being deformed by the heat from the sheathed heater 35.

  As described above, the cover portion 33 is not easily deformed, but the cover portion 33 is attached to the cover portion 33 due to aging due to heat transmitted from the sheathed heater 35 to the cover portion 33 via the mounting bracket 40. There are cases where distortion occurs around the opening 38 and a gap is formed between the resin cover 33 and the flange of the metal annular member 46. However, in the present embodiment, the rib formed by bending the front end portion of the flange of the annular member 46 to the main body side (lower side) at a substantially right angle is formed around the mounting opening 38 on the surface of the cover portion 33. Press fit into the groove. Therefore, when the gap formed between the cover portion 33 and the flange of the annular member 46 is small and the rib is still inserted into the groove, the hot water boiled in the pot 32 is removed from the gap. Leakage to the surface of the cover part 33 is prevented.

  Furthermore, even when the distortion generated around the mounting opening 38 in the cover portion 33 increases and the rib of the annular member 46 comes out of the groove of the cover portion 33, in the present embodiment, it is A mounting bracket 40 provided with a flange 44 extending radially outward is mounted on the mounting opening 38 from the outside (upper side). Therefore, the hot water in the pot 32 leaking from the gap between the cover part 33 and the annular member 46 is formed inside the cover part 33 with the flange of the mounting bracket 40 inside, as in the case of the steam generator 11 shown in FIGS. Compared with the case of mounting from the (lower side), overflow of the flange 44 and flow into the mounting bracket 40 can be suppressed.

  Further, in the present embodiment, the rib 45 is formed by bending the tip end portion of the flange 44 to the side opposite to the bottom portion side at a substantially right angle. That is, the tip of the rib 45 is located higher than the flange 44 that is the mounting surface of the mounting bracket 40. Therefore, even if a lot of hot water in the pot 32 leaks from the gap between the cover portion 33 and the flange of the annular member 46, it is blocked by the rib 45 extending to a position higher than the mounting surface. It can prevent more actively flowing into the mounting bracket 40 which has. As a result, it is possible to prevent the thermostat 43 that is attached to the lower stage bottom portion 41b and operates with an AC voltage of 100V from being short-circuited to cause a fire or the like.

  In the above embodiment, the rib 45 of the mounting bracket 40 is formed by bending the front end of the flange 44. Further, the rib of the annular member 46 is formed by bending the front end of the flange. However, the present invention is not limited to this, and a rib 45 formed separately may be attached to the tip of the flange 44. Moreover, you may attach the said rib formed separately in the front-end | tip of the said flange.

31 ... Steam generator,
32 ... pot,
33 ... cover part,
32a, 33a ... flange part,
34 ... Screw,
35 ... Seeds heater,
35a, 35b ... end of sheathed heater,
36 ... insertion hole,
37 ... lid member,
38 ... mounting opening,
39: Steam supply passage,
40: Mounting bracket,
42 ... Thermistor,
43 ... Thermostat,
44 ... Flange,
45 ... ribs,
46 ... annular member,
47 ... Stud screw,
48a, 48b ... Metal plates.

Claims (3)

A pot for storing water with an opening at the top;
A heater for steam generation that is installed in the pot and heats water in the pot;
A high-temperature safety shut-off device that operates at a commercial voltage, detects that the temperature of water in the pot has reached a preset abnormal temperature, and shuts off the power to the steam generating heater,
Covering the opening of the pot, and a cover portion provided with an attachment opening for attaching the high-temperature safety shut-off device;
It is formed in a substantially concave shape with metal, the high temperature safety shut-off device is attached to the bottom, and the mounting bracket is attached to the mounting opening of the cover part from the outside,
The mounting bracket is
A main body having a concave shape, a flange extending radially outward from an annular edge of the main body, and a rib extending so as to protrude from the front end side of the flange to the side opposite to the bottom side;
The safety structure for a steam generator, wherein the flange is attached to the attachment opening by being attached around the attachment opening on the surface of the cover portion. In the safety structure of the steam generator according to claim 1,
In addition to the high-temperature safety shut-off device, the bottom of the mounting bracket detects that the temperature of the water in the pot has reached a preset temperature lower than the preset abnormal temperature, and generates the steam. A steam generator safety structure, wherein a water temperature detector for turning off the heater is attached. In the safety structure of the steam generator according to claim 1 or 2,
A cylindrical main body formed of metal and mounted with the mounting bracket, a flange extending radially outward from an annular edge of the main body, and protruding from the front end side of the flange to the main body side And an annular member that is attached to the mounting opening from the outside,
Around the mounting opening on the surface of the cover portion, a groove into which the rib of the annular member attached to the mounting opening from the outside is inserted is formed.
The mounting bracket is mounted on the annular member mounted on the mounting opening from the outside, and the mounting opening is attached to the surface of the cover portion via the flange of the annular member. A steam generator safety structure characterized by being mounted on

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