JP7277285B2 - heater - Google Patents

Description

The present invention relates to heaters.

2. Description of the Related Art Conventionally, a natural convection type heater is known that has a heat generating portion such as a sheathed heater and radiates the heat of the heat generating portion directly or indirectly from the outer surface of fins. Such a heater includes a room temperature sensor that detects the room temperature, and controls the output of the heat generating section according to the detected room temperature.

JP-A-9-60900

In order for the heater to control the output of the heater according to the room temperature, it is important that the room temperature sensor accurately detect the room temperature. For example, the room temperature sensor is preferably placed near the air intake that draws in room air.

A natural convection type heater has a smaller flow rate of sucked air than a forced convection type heater that sucks air with a blower, and heat tends to stay in the heat generating part. Therefore, depending on the location of the room temperature sensor, the room temperature sensor is susceptible to heat, and there is a risk that the room temperature cannot be measured accurately.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heater capable of accurately detecting room temperature.

In order to solve the above-described problems, a heater according to the present invention includes a heater, a main control board that controls power supply to the heater according to room temperature, and a housing that accommodates the heater and the main control board. a body, a caster-equipped leg fixed vertically downward of the housing, and a room temperature sensor fixed to the caster-equipped leg to supply information about room temperature to the main control board , wherein the caster-equipped leg is It has a caster and a fixture that attaches the caster to the housing and opens downward to form a space inside, and the room temperature sensor is arranged in the space inside the fixture.

The room temperature can be detected with high accuracy in the heater according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view seen from the right front of the heater which shows one Embodiment of the heater which concerns on this invention. The perspective view which removed the front plate and right-and-left panel of a heater, and was seen from the right front. Sectional drawing which follows the III-III line of FIG. The functional block diagram of a heater. FIG. 4 is an enlarged view of the front leg portion of FIG. 3;

An embodiment of a heater according to the present invention will be described with reference to the attached drawings.

FIG. 1 is a perspective view of a heater 1 according to an embodiment of the present invention, viewed from the front right.
FIG. 2 is a perspective view of the heater 1 with the front plate 31 and the left and right panels 35 removed and viewed from the front right.
FIG. 3 is a cross-sectional view taken along line III--III in FIG.
FIG. 4 is a functional block diagram of the heater 1. As shown in FIG.

In the following description, "front (front)", "rear (back)", "top", "bottom", "right" and "left" follow the definitions in FIGS. The vertical direction corresponds to the vertical direction when the heater 1 is installed. The front-rear direction and the left-right direction correspond to the horizontal direction when the heater 1 is installed.

The heater 1 mainly includes a radiator 10 , a heater 20 , a housing 30 , a main control board 70 and a power supply board 80 .

The heat radiating section 10 has an upper heat radiating section 10a, a middle heat radiating section 10b, and a lower heat radiating section 10c. The upper heat radiating section 10a, middle heat radiating section 10b, and lower heat radiating section 10c (hereinafter simply referred to as "heat radiating section 10" when they are not distinguished) include an upper heater 20a, a middle heater 20b, and a lower heater 20c (hereinafter, these heaters). , simply referred to as "heater 20"), and the heat of the heater 20 is dissipated from the outer surface. The heat radiating portion 10 is, for example, an aluminum alloy die-cast product. The heat radiating section 10 has a heater accommodating section 11 and a plurality of fins 12 . The heater housing portion 11 is formed between two plate-like members 13 having a surface direction along the front-rear direction, and houses the heater 20 . The fins 12 protrude substantially vertically from the plate-like member 13 in the left-right direction and extend in the up-down direction (having a surface direction along the up-down direction). The fins 12 are arranged, for example, at substantially equal intervals along the front-rear direction. The heat radiating section 10 is connected to fixtures 15 by bolts 14 on the left and right side surfaces. The heat radiating section 10 is fixed (installed) to the pair of heat shield plates 50 via the fixtures 15 .

The heater 20 is, for example, a sheathed heater having terminals 21 at both ends. The heater 20 has a U-shape extending mainly in the front-rear direction. The heater 20 is accommodated in the heater accommodating portion 11 with the terminals 21 exposed from the heat radiating portion 10 . The heater 20 is integrally formed with the heat radiating section 10 by being cast inside the heat radiating section 10 .

The housing 30 accommodates the heat radiating section 10 and forms an outer shell of the heater 1 . The housing 30 has a front plate 31 , a rear plate 32 , a lower plate 33 , an upper cover 34 , left and right panels 35 , a heat shield plate 50 and a partition plate 60 . The front plate 31, the rear plate 32, the lower plate 33, the upper cover 34, and the left and right panels 35 are made of thin steel plates such as cold-rolled steel plates and hot-dip galvanized steel plates. The heat shield plate 50 and the partition plate 60 are made of, for example, thin steel plates.

The front plate 31 is arranged along the front surface of the heater 1 . The front panel 31 has a display section 37 , an operation section 38 and a front handle 39 . The display unit 37 is, for example, a liquid crystal display panel that displays the operating state and operation details of the heater 1 . The operation unit 38 receives instructions for turning on/off the power of the heater 1 and for operating details. The front handle 39 is arranged above the display section 37 and used by the user to move the heater 1 . The rear plate 32 is arranged along the rear surface of the heater 1 . The rear plate 32 has a rear handle (not shown) at a position paired with the front handle 39 in the front-rear direction.

The lower plate 33 is arranged to be positioned below the housing 30 . The lower plate 33 serves as a base for the front plate 31 , the rear plate 32 and the heat shield plate 50 . The lower plate 33 is arranged across the heater chamber 30a and the substrate chamber 30b in the front-rear direction. The lower plate 33 positioned on the heater chamber 30a side has a heater chamber side suction port 40a for taking air into the heater chamber 30a. The lower plate 33 located on the substrate chamber 30b side has a substrate chamber side suction port 40b for taking air into the substrate chamber 30b. The lower plate 33 has a pair of legs 41 with casters that are used to move the heater 1 . The leg with casters 41 is fixed vertically downward of the housing 30 . The details of the legs 41 with casters will be described later.

The upper cover 34 is arranged along the upper surface of the heater 1 . The upper cover 34 has a grille 42 , a wire mesh 43 and panel fixtures 45 . The grill 42 has a heater-chamber-side air outlet 46a that blows out the air that is taken in from the heater-chamber-side inlet 40a or the substrate-chamber-side inlet 40b and that flows upward in the heater 1 from below. The wire mesh 43 is arranged below the grill 42 so as to block the heater chamber side outlet 46a. The panel fixture 45 is a frame member that is arranged below the wire netting 43 and spans between the pair of heat shield plates 50 in the front-rear direction. The panel fixture 45 has claw portions 45a, which are structures for fixing the left and right panels 35, on the left and right frame surfaces.

The left and right panels 35 are arranged along the left and right side surfaces of the heater 1, respectively. The left and right panels 35 cover and shield the heat radiating section 10 in order to ensure the safety of the user against high-temperature heat from the heat radiating section 10 . Thereby, the inside of the heater 1 is not visually recognized by the user.

The left and right panels 35 have inner folds (not shown) at their upper ends. The upper ends of the left and right panels 35 are fixed by hooking the claws 45 a of the panel fixture 45 on the folded back. The lower ends of the left and right panels 35 are fixed by being screwed to the lower plate 33 . Front and rear ends of the left and right panels 35 are engaged with the front plate 31 and the rear plate 32, respectively. The central portion 36a of the left and right panels 35 has a shape that bulges away from the heat radiating portion 10 with respect to the outer edge portion 36b. As a result, the left and right panels 35 are fixed in a non-contact manner with the heat shield plate 50 , and a certain gap is provided between them and the heat radiating section 10 . Therefore, the left and right panels 35 are prevented from excessive temperature rise.

The heat shield plate 50 shields the heat from the heat radiating portion 10 between the front plate 31 and the rear plate 32 and the heat radiating portion 10 . The heat shield plate 50 has a lower portion fixed to the lower plate 33 and an upper portion fixed to the panel fixture 45 positioned above the heat shield plate 50 . Thereby, the heat shield plate 50, the panel fixture 45, and the lower plate 33 constitute the internal framework of the heater 1 (heater chamber 30a).

A front heat shield plate 51 disposed in front and opposed to the front plate 31 partitions the inside of the housing 30 and isolates the heat radiating section 10 from the electronic components. That is, the front heat shield plate 51 is configured such that the housing 30 has a heater chamber 30a in which the heater 20 is housed, and a board chamber 30b in which the power supply board 80, the thermostat 85, the lead wires 87 and the main control board 70 are housed. , partition the inside of the housing 30 . The substrate chamber 30b is separated from the heater chamber 30a in the front-rear direction (horizontal direction perpendicular to the vertical direction). The front heat shield plate 51 has a substrate chamber side outlet 46b (air outlet) vertically upward. The substrate chamber side air outlet 46b discharges the air that rises in the substrate chamber 30b by natural convection to the heater chamber 30a side.

The partition plate 60 is arranged in the board chamber 30 b and divides the board chamber 30 b into a first space 90 containing the power supply board 80 and the lead wires 87 and a second space 91 containing the main control board 70 . The second space 91 is a space positioned forward of the partition plate 60 in the vertical range where the partition plate 60 is positioned. The first space 90 is a space other than the second space 91 in the substrate chamber 30b. As is clear from FIGS. 2 and 3, not all boundaries between the first space 90 and the second space 91 are clearly separated by the partition plate 60 .

The partition plate 60 has a base surface 61 , an inclined surface 62 and fixed pieces 63 . The base surface 61 is a flat plate having a surface direction along the vertical direction. The base surface 61 is arranged rearward of the main control board 70 and forward of the power supply board 80 and the lead wires 87, as shown in FIG. The upper end 61 a of the base surface 61 (the upper end of the partition plate 60 ) is located above the main control board 70 in consideration of heat dissipation from the power supply board 80 and noise from the lead wires 87 . It is preferable that no gap be provided between the left and right sides 61b of the base surface 61 and the heat shield plate 50 in terms of heat shielding and noise shielding properties.

The inclined surface 62 is a flat plate formed continuously with the lower end of the base surface 61 (base surface lower end 61c), and is inclined downward from the position of the base surface lower end 61c so as to approach the front plate 31 . A lower end of the inclined surface 62 (an inclined surface lower end 62 c ) has a gap 92 with respect to the front plate 31 . The lower end 62c of the inclined surface is located below the main control board 70. As shown in FIG. The fixing pieces 63 are intermittently provided on the left and right sides 61 b of the base surface 61 to fix the partition plate 60 to the left and right side surfaces 51 a of the front heat shield plate 51 .

At the lower end 62c of the inclined surface (the lower end of the partition plate 60), the partition plate 60 has a first flow path and a second flow path for the air sucked from the substrate chamber side air inlet 40b and directed to the substrate chamber side air outlet 46b. and branches to The first flow path is a flow path that passes through the first space 90 , that is, the rear of the partition plate 60 . The second flow path is a flow path that passes through the second space 91 , that is, the front side of the partition plate 60 .

The main control board 70 is a circuit board having a microcomputer that controls the heater 1 in an integrated manner. The main control board 70 receives a user's instruction via the operation unit 38 and controls power supply from the power supply board 80 to the heater 20 based on this instruction. The main control board 70 also controls the display section 37 to display necessary information. The main control board 70 is fixed to the rear side of the display section 37 and the operation section 38 of the front panel 31 together with the display section 37 and the operation section 38 .

Main control board 70 is connected to room temperature thermistor 71 and plug thermistor 72 . A room temperature thermistor 71 (room temperature sensor) is fixed to the caster-equipped leg 41 , sets the temperature outside the heater 1 to room temperature, and supplies information about the room temperature to the main control board 70 . The main control board 70 controls power supply to the heater 20 according to the room temperature obtained from the room temperature thermistor 71 . The plug thermistor 72 is a thermistor housed within the power plug 86 and detects the temperature of the power plug 86 . The main control board 70 turns off the heater 1 (stops power supply to the heater 20) when an abnormally high temperature is detected from the plug thermistor 72 so as to indicate that a tracking phenomenon or the like has occurred.

The power board 80 supplies power to each heater 20 under the control of the main control board 70 . The power supply board 80 mainly has a triac 81 and a heat sink 82 . The triac 81 controls power supply to the heater 20 on and off. The heat sink 82 radiates heat from the triac 81 .

Also, the power board 80 is connected to a thermostat 85 and a power plug 86 . Thermostat 85 is connected in series with power plug 86 via lead wire 87 and power supply board 80 . Thermostat 85 is arranged vertically above power supply board 80 and above main control board 70 and partition plate 60 . The thermostat 85 is fixed to the front heat shield plate 51, and turns off the heater 1 (cuts off the power supply to the heater 20) when the ambient temperature in the substrate chamber 30b becomes abnormally high.

The main control board 70 is arranged in the second space 91 between the power supply board 80 and the thermostat 85 . The power board 80 is arranged in the first space 90 below the main control board 70 . The lead wire 87 extends vertically through the first space 90 .

Next, the details of the leg 41 with casters will be described. FIG. 5 is an enlarged view of the front leg 41a portion of FIG.

The leg 41 with casters has a front leg 41 a fixed to the front of the lower plate 33 and a rear leg 41 b fixed to the rear of the lower plate 33 . The front leg 41a and the rear leg 41b are fixed outside the heater chamber side suction port 40a in the longitudinal direction so as not to block the heater chamber side suction port 40a. The rear leg 41b has substantially the same configuration as the front leg 41a, except that the room temperature thermistor 71 is fixed to the front leg 41a and the front leg 41a has the required configuration associated therewith. Therefore, the configuration of the front leg 41a will be specifically described below.

The front leg 41 a has casters 101 , connectors 102 and leg fixtures 103 . Two casters 101 are provided side by side in the left-right direction. The connector 102 is a member for connecting the caster 101 to the leg fixture 103 . The connector 102 fixes and supports the caster 101 by screws, fitting, or the like. The connector 102 is fixed to the leg fixture 103 with screws or the like. The leg fixture 103 is, for example, a thin steel plate that attaches the caster 101 to the lower plate 33 via the connector 102 . The leg fixture 103 has a U-shaped cross section in the up-down direction (vertical direction) having an opening 103b at the bottom. The leg fixture 103 is fixed to a portion of the lower plate 33 that overlaps with the substrate chamber 30b when viewed in the up-down direction (vertical direction). Since the leg fixture 103 overlaps the board chamber side suction port 40b, it has an air hole 104 connecting the outside of the housing 30 and the board chamber side suction port 40b at a position corresponding to the board chamber side suction port 40b. As a result, the space formed by the inner peripheral surface 103a of the leg fixture 103 serves as a flow path for the air taken into the substrate chamber side suction port 40b.

The leg fixture 103 has a top surface 110 and a pair of hanging portions 111 . The top surface 110 is a flat plate having a surface direction along the horizontal direction. The top surface 110 has long sides 110a extending in the left-right direction and short sides 110b extending in the front-rear direction (FIG. 2). The pair of hanging portions 111 are flat plates that extend downward in a direction perpendicular to the top surface 110 from opposing long sides 110 a of the top surface 110 .

Here, the top surface 110 has a thermistor hole 110c through which the room temperature thermistor 71 connected to the main control board 70 by a cable 71a penetrates the top surface 110 and protrudes from the substrate chamber 30b. Similarly, holes through which the room temperature thermistor 71 passes are provided at positions corresponding to the thermistor holes 110c of the lower plate 33 and the front heat shield plate 51, respectively. These holes and the thermistor hole 110</b>C have an inner diameter slightly larger than the outer shape of the tip 71 b of the room temperature thermistor 71 . As a result, the room temperature thermistor 71 protrudes from the substrate chamber 30 b into the space formed by the inner peripheral surface 103 a of the leg fixture 103 outside the housing 30 . The room temperature thermistor 71 is fixed to the inner peripheral surface 103 a of the leg fixture 103 by the support 75 of the room temperature thermistor 71 . At this time, room temperature thermistor 71 is fixed so that tip 71b protrudes downward from opening 103b of leg fixture 103 .

The room temperature thermistor 71 fixed in this way can suitably detect the room temperature. That is, the room temperature thermistor 71 is located outside the housing 30 rather than inside the housing 30, which is susceptible to the radiant heat of the heater 20 or the heat generation of the power supply board 80, and is resistant to the radiant heat of the heater 20 or the heat generation of the power supply board 80. It is placed in a space shielded by the leg fixture 103. Therefore, the room temperature thermistor 71 can accurately detect the room temperature. Also, the room temperature thermistor 71 is fixed to the inner peripheral surface 103 a of the leg fixture 103 . Therefore, the room temperature thermistor 71 is mostly hidden from the user, and the appearance of the heater 1 is not spoiled.

Also, the heater 1 sucks air into the substrate chamber 30b from the opening 103b of the leg fixture 103 through the air hole 104 and the substrate chamber side suction port 40b. That is, the space formed by the inner peripheral surface 103a of the leg fixture 103 serves as a flow path for the air taken into the substrate chamber 30b. Therefore, heat retention is suppressed in the space formed by the inner peripheral surface 103a of the leg fixture 103, and the room temperature thermistor 71 can detect a temperature closer to room temperature.

Furthermore, the tip 71b of the room temperature thermistor 71 protrudes from the opening 103b. For this reason, the tip 71b is arranged on the flow path of the high-flow air taken into the heater-chamber-side suction port 40a. Therefore, room temperature thermistor 71 can detect a temperature closer to room temperature.

Therefore, the heater 1 in this embodiment has the room temperature thermistor 71 in the leg 41 with casters, which also serves as a shield from the radiant heat of the heater 20 and the user, so that the room temperature can be detected with high accuracy.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

For example, the room temperature thermistor 71 is used as an example of the room temperature sensor, but other temperature sensors may be used. Also, the heater 20 has been described as a U-shaped sheathed heater that extends mainly in the front-rear direction, but it may extend in the vertical direction, have other shapes such as an I-shape or an L-shape, or have other shapes other than sheathed heaters. Other types of heaters may be used.

1 heater 10 radiator 20 heater 30 housing 30a heater chamber 30b substrate chamber 33 lower plate 40a heater chamber side suction port 40b substrate chamber side suction port 41 leg with caster 71 room temperature thermistor 71a cable 71b tip 101 caster 102 connector 103 leg Fixture 103a Inner peripheral surface 103b Opening 104 Air hole 110 Top surface 110a Long side 110b Short side 110c Thermistor hole 111 Hanging portion

Claims (5)

a heater;
a main control board that controls power supply to the heater according to room temperature;
a housing that accommodates the heater and the main control board;
a leg with casters fixed vertically downward of the housing;
a room temperature sensor fixed to the caster leg and supplying information about room temperature to the main control board ;
The leg with caster has a caster and a fixture that attaches the caster to the housing and opens downward to form a space inside,
The heater , wherein the room temperature sensor is arranged in the space inside the fixture . The housing includes a heater chamber that accommodates the heater, a substrate chamber that is partitioned in a direction perpendicular to the vertical direction from the heater chamber and stores the main control substrate, and the heater chamber and the substrate chamber. Having a lower plate positioned below the housing in the vertical direction,
2. The heater according to claim 1, wherein said legs with casters are fixed to said lower plate overlapping said substrate chamber when viewed in the vertical direction. the lower plate has a substrate-chamber-side suction port for taking in air from outside the housing into the substrate chamber;
The fixture has a hole connecting the outside of the housing and the substrate chamber side suction port, and forms a flow path for the air taken into the substrate chamber in the space formed by the inner peripheral surface. 3. A heater according to claim 2 . the lower plate has a heater-chamber-side suction port for introducing air into the heater chamber;
4. The heater according to claim 3 , wherein said room temperature sensor is arranged on a flow path of said air taken into said heater chamber. The heater according to any one of claims 1 to 4, wherein the room temperature sensor is fixed to the fixture so that a tip thereof protrudes downward in the vertical direction from the opening of the fixture.

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