JPH0441557Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a temperature detection device suitable for use in heating appliances such as rice cookers, rice cookers, electric pots, electromagnetic cookers, microwave ovens, etc.
By constructing the support member that supports the sensor from a heat-resistant insulating resin molded body, the insulation treatment of the sensor and its lead wires is facilitated, the sensor is prevented from being damaged or cracked, and the number of parts is reduced.
This simplifies assembly.

<Prior art> The most well-known conventional temperature detection device of this type is the center thermo method, which detects the presence or absence of an object to be heated such as a pan, and connects the heater power supply circuit to the machine. It was configured to open and close using a manual switch, and was not configured to continuously detect the temperature of the heated object and perform temperature control.
As a conventional technology capable of temperature control, there is also a known technology that detects the presence or absence of an object to be heated at the bottom of the pan, and also detects the temperature on the side of the pan to control the temperature. Since there are two detection points, one for detecting the heated object and the other for temperature detection, there is a problem that the number of parts is doubled and the cost is increased.

Conventional techniques for eliminating such drawbacks include, for example, as disclosed in Japanese Utility Model Application No. 59-184436, a movable body that moves forward and backward depending on the presence or absence of a heated object, and a movable body that is turned on and off by the forward and backward movement of the movable body. A temperature detection device has been proposed that includes a switch and a temperature sensing element mounted on the movable body to detect the temperature of the heated body.

FIG. 18 is a partial cross-sectional view of a conventional temperature detection device.
FIG. 19 is a partial cross-sectional view of the device in use. In the figure, reference numeral 1 denotes a storage case made of a highly heat-resistant material, such as a metal plate. A magnetic shielding plate 102 is provided protruding from the bottom plate 101 of the storage case 1 .

A movable body 3 is arranged inside the storage case 1. The movable body 3 includes a cylindrical cover member 31,
A case-shaped support member 32 is housed in the inner diameter of the cover member 31, a support member 33 is coupled to the upper opening of the support member 32, and a support member 33 is crimped onto the periphery of the cover member 31 from above the support member 33. It is configured to include a lid 34 that is coupled by means such as the like. The movable body 3 is supported inside the storage case 1 by a coil spring 4 wrapped around the outside of the cover member 31.

The support member 32 is formed of a metal plate material, and has a slit 3 approximately in the middle of the bottom plate through which the magnetic shielding plate 102 provided in the storage case 1 is inserted.
21, and on both sides of the slit 321, a magnet 5 and a magnetically responsive switch 6 consisting of a reed switch are arranged and fixed in opposition.

Next, the support member 33 is made of a metal plate like the support member 32. This support member 33
A recess 331 is formed in a part of the surface side of the recess 331, and the temperature sensing element 7 is positioned and fixed within this recess 331. As the temperature sensing element 7, an NTC thermistor or a PTC thermistor is used. Among these, glass-sealed NTC thermistors are particularly preferred. Glass-sealed NTC thermistors are moisture resistant,
This is because it has excellent stability.

The lead wires 61 of the magnetically responsive switch 6 and the lead wires 71 of the temperature sensing element 7 are coated with insulation, and then folded into bent pieces 32 formed on the supporting members 32 and 33.
2, 333, etc., and is fixedly attached to the surface of the case member 32 and guided. In addition, these lead wires 61,
Since this temperature detection device is placed in a high-temperature atmosphere, the insulating coating of No. 71 is coated with a heat-shrinkable insulating tube, heat-shrinked, and then aged to improve reliability against heat. It has been improved.

In the temperature detection device having the above structure, when there is no object to be heated on the lid 34 of the movable body 3, the movable body 3 is at the upper limit position as shown in FIG. 321, and responds to the magnetic action from the magnet 5. When a normal oven type reed switch is used as the magnetic response switch 6, the magnetic response switch 6 is turned on, for example. Become. Therefore, the temperature sensing element 7 is short-circuited by the magnetic response switch 6, current no longer flows through the temperature sensing element 7, and the temperature sensing operation is stopped. In other words, if there is no object to be heated and therefore no temperature measuring operation is required, the temperature detection circuit is shut off.

On the other hand, as shown in FIG. 19, when the object to be heated 8 is placed and temperature measuring operation becomes necessary, the movable object
moves down against the coil spring 4, and the magnetic shielding plate 102 enters the slit 321 and the magnet 5
Magnetism from the magnetically responsive switch 6 is shielded, the magnetically responsive switch 6 is turned off, current flows through the temperature sensing element 7, and a temperature detection signal is taken out from the lead wire 71. Temperature control is possible by controlling the heat generation temperature of the heater using this temperature detection signal. Reference numeral 9 is a heater.

<Problems to be Solved by the Invention> However, in the above-described conventional temperature detection device, the magnet 5, the magnetically responsive switch 6, and the temperature sensing element 7 are mounted on two supporting members 3, which are separate components.
Since the support members 32 and 33 are attached to the support members 2 and 33 individually and then assembled by further inserting them into the inside of the cylindrical cover member 31, there is a problem that the assembly becomes extremely troublesome.

Therefore, an object of the present invention is to solve the above-mentioned problems and provide a temperature detection device that is easy to assemble.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention provides a movable body that is supported by a spring so as to be movable and moves back and forth depending on the presence or absence of a heated object, and a movable body that moves back and forth depending on the presence or absence of a heated object, and A temperature detection device comprising: a switch that turns on and off when the movable body is turned on; a temperature sensing element provided on the movable body to detect the temperature of the heated body; and a case supporting the spring and the movable body, the movable body has a support member and a cylindrical cover member, the support member is formed of a heat-resistant insulating resin integrally molded body, and has a recess for accommodating the switch and the temperature-sensitive element. , a portion thereof has a radial length such that it can be fitted in sliding contact with the inside of the cover member while a portion thereof is along the inner circumferential surface of the cover member, and the cover member has the supporting member built therein. At the same time, the support member is clamped and fixed by a bent piece formed on one end face side facing the bottom face of the case and a lid provided on the other end side.

<Function> The support member is formed of a heat-resistant insulating resin integrally molded body and has a recessed portion for accommodating the switch and the temperature sensing element, so the switch and the temperature sensing element can be integrated on the support member and the unit can be assembled easily. Further, by utilizing the electrical insulation properties of the molded body constituting the support member, it is possible to support the switch, the temperature sensing element, and its lead wires, and to ensure electrical insulation. Therefore, there is no need to provide a special insulation treatment member, the number of parts is reduced, and the structure is simplified.

The support member has a radial length that allows the support member to be fitted in sliding contact with the inside of the cover member with a portion thereof along the inner circumferential surface of the cover member, and the cover member incorporates the support member, and The supporting member is clamped and fixed by the bent piece formed on one end facing the bottom of the case and the lid provided on the other end, so that the supporting member does not swing within the cover member. The support member is accurately positioned relative to the cover member. Therefore, the support member can be accurately positioned by simply fitting the support member to the cover member, and stable and reliable temperature measuring and switching operations can be performed.

Since the support member is fitted inside the cover member, the cover member serves as a support member, a protective case for the temperature sensing element, and the switch. Therefore, the support member, the temperature sensing element thereon, and the switch are protected and are less likely to be damaged. Moreover, the movable body is integrated into one component, making it easier to handle and assemble.

<Example> FIG. 1 is an exploded perspective view of a temperature detection device according to the present invention, and FIG. 2 is an assembled sectional view thereof. In the figure, the same reference numerals as in FIGS. 18 and 19 indicate the same components, and the movable body 3 is supported movably by a spring 4 and moves back and forth depending on the presence or absence of the heated body 8, and the movable body a switch 6 that is turned on and off by the forward and backward movements of the movable body 3; a temperature sensing element 7 that is provided on the movable body 3 and detects the temperature of the heated body 8;
It includes a spring 4 and a case 1 that supports a movable body 3.

Reference numeral 11 denotes a support member made of a heat-resistant insulating resin integrally molded body, and is disposed inside the cylindrical cover member 31. In this embodiment, the support member 11 is
As shown in FIGS. 3 to 6, flanges 111 and 112 that fit the inner diameter of the cover member 31 are formed at both ends in the axial direction forming a part of the outer diameter, and the flanges 111- It has a drum-like shape in which columns 112 are integrally connected by columnar parts 113. Tsuba 1
11 and 112 have a radial length that allows them to be fitted in sliding contact with the inside of the cover member 31 in a state along the inner circumferential surface of the cover member 31. Further, a concave portion 114 extending in the radial direction is formed approximately at the center of the surface of the collar portion 111 on one end side in the axial direction. This recess 114
As will be explained later, this is the part where the temperature sensing element 7 is attached. Furthermore, the columnar part 113 has a flange part 112.
A magnetic shielding plate 10 is provided on the bottom surface 101 of the storage case 1 from a certain axial direction toward the inside thereof.
A recess 116 for mounting the magnet 5 and a recess 117 for mounting the magnetically responsive switch 6 are formed on both sides of the slit 115. Further, lead wire insertion holes 118 and 119 are formed in the outer circumference of the collar portion 112, and pin-shaped terminals 12 and 13 are implanted in the inner circumference.

The cover member 31 is a cylindrical body having an axial length and a radial length, and has the support member 11 built therein. The support member 11 includes a bent piece 311 formed at the opening edge on one end side of the cover member 31, and a lid body 15 provided at the opening on the other end side where the temperature sensing element 7 is arranged.
It is sandwiched between. Reference numeral 14 is a heat-resistant insulating plate made of silicone rubber, mica, or the like and having good heat conduction. The lid body 15 is made of metal material.

FIG. 7 is a partially cutaway view showing the mounting structure of the magnetically responsive switch 6, which is composed of the temperature sensing element 7, the magnet 5, and the reed switch, to the support member 11.
First, the temperature sensing element 7 is wrapped in a heat-resistant insulating tube or the like and housed in a recess 114 provided on the surface of the flange 111, and the lead wire 7 is coated with insulation from both ends.
Pull out 1,71. The main body of the magnetically responsive switch 6 is housed in a recess 117, and lead terminals 6a and 6b are soldered and fixed to pin-shaped relay terminals 12 and 13, and insulated lead wires 61 are attached to the relay terminals 12 and 13. , 61 are soldered and fixed.
The lead wires 61, 61 are bent into a U shape near the flange 111, and are inserted into the lead wire insertion hole 18 formed in the flange 112 together with the lead wires 71, 71 of the temperature sensing element 7.
19 and restrained therein (see Fig. 1).

Here, the support member 11 is formed of a heat-resistant insulating resin integrally molded body, and includes a recess 116 for accommodating the magnet 5, the magnetically responsive switch 6, and the temperature sensing element 7.
117 and 114, these parts 5 to 7 can be integrated on the support member 11 to form a unit, making assembly easy. In addition, it is possible to use ordinary heat-resistant insulated lead wires as the lead wires 61 of the magnetically responsive switch 6 and the lead wires 71 of the temperature-sensitive element 7, and the heat-shrinkable tube insertion process, which was previously essential, can be avoided. A heat shrinking process and an aging process are no longer necessary, and there is no need to provide a special insulation treatment member. Furthermore, the elasticity of the support member 11 prevents the magnetically responsive switch 6 from being damaged or cracked.

The cover member 31 is cylindrical and has an opening at one end in the axial direction, and has a lid 15 in the opening at the other end, so when assembled by inserting the support member 11 through the opening at the one end, the lid is closed. The support member 11 can be positioned in the axial direction by means of the body 15 . Therefore, the work of assembling and positioning the support member 11 into the cover member 31 becomes easier.

The support member 11 has a radial length that allows it to be fitted in sliding contact with the inside of the cover member 31 with a part of it along the inner circumferential surface of the cover member 31. Since they are fitted in contact with each other, and are positioned and fixed in contact with the lid body 15, the support member 11 is prevented from swinging within the cover member 31, and the support member 11 is prevented from swinging within the cover member 31. 11 is accurately positioned. For this reason,
By simply fitting the support member 11 into the cover member 31, the support member 11 can be accurately positioned and stable and reliable temperature measuring and switching operations can be performed.

Since the support member 11 is fitted inside the cover member 31, the cover member 31 is fitted inside the support member 1.
1. It is also used as a protective case for the magnet 5, the magnetically responsive switch 6, and the temperature sensing element 7. Therefore, the support member 11, the temperature sensing element 7 thereon, and the switches 5 and 6 are protected and are less likely to be damaged. Moreover, the movable body is integrated into one component, making it easier to handle and assemble.

In the embodiment, the supporting member 11 is further formed with recesses 114, 116, 117, etc., and sensors such as the temperature sensing element 7, the magnet 5, and the magnetically responsive switch 6 can be housed therein. Installation becomes easier.

Further, the support member 11 is attached to the bottom surface 1 of the storage case 1.
It has a slit 115 formed inward from the end face side facing 01, and the magnetic shielding plate 102 provided in the storage case 1 is inserted into and removed from the slit 115, so that the magnetic shielding plate 102 comes in and out while being protected by the support member 11, and the protection of the magnetic shielding plate 102 and the electrical insulation between the magnetic shielding plate 102 and the magnetically responsive switch 6 are improved.

Moreover, the magnetic response switch 6 and the magnet 5
are arranged on both sides of the slit 115 with the slit 115 in between, and the magnetically responsive switch 6 is turned on and off by the magnetic shielding plate 102 that enters and exits the slit 115. The on/off operation does not depend on the relative distance relationship with the magnet 5, but only on the magnetic shielding plate 1.
It is determined by the entry and exit of 02 into and out of the slit 115. Therefore, malfunctions due to misalignment between the magnet 6 and the magnetically responsive switch 6 or relative distance fluctuations are less likely to occur, and reliability is improved.

8 to 10 show another embodiment of the support member 11. FIG. In this embodiment, the support member 11
is molded into a columnar body using heat-resistant insulating resin,
A recess 114 for accommodating the temperature sensing element 7 and a recess 117 for accommodating the magnetically responsive switch 6 are formed on one end surface A side in the axial direction, and a recess 116 for accommodating the magnet 5 is formed on the outer peripheral surface. ing. The recess 114 is formed to have a relatively shallow depth to accommodate the temperature sensing element 7, and the recess 117 is such that the magnetically responsive switch 6 accommodated therein is connected to the magnet 5 accommodated in the recess 116.
A slit 115 is formed between the recess 117 and the recess 116 to allow the magnetic shielding plate 102 to enter and exit. Both ends of the recesses 114 and 117 are connected to the recess 12 formed along the axial direction of the outer peripheral surface.
0 and 121, and this recess 1
Lead wires 61 and 71 are pulled out from 20 and 121.

In the case of this embodiment, the lead wire 61 of the magnetically responsive switch 6 can be directly pulled out through the recesses 120 and 121 provided in the support member 11 without the need for relay terminals, making the assembly work even easier. become. Furthermore, since the lead wires 61, 71 are guided through the recesses 120, 121 of the support member 11, the lead wires 61, 71 do not fall apart, are well organized, and are easy to assemble.

FIGS. 13 to 17 show still another embodiment. In this embodiment, a recess 114 for accommodating the temperature sensing element 7 is formed on one end surface A in the axial direction of the support member 11 made of a heat-resistant insulating resin molded body.
A through hole 12 is provided to penetrate both ends of 4 in the axial direction.
2, 123 leads to the other end surface A side. Concave portions 124 and 125 that are continuous to both ends of the concave portion 114 are respectively formed on the one end surface A side of the support member 11 in which the concave portion 114 is formed, and the ends of these concave portions 124 and 125 are penetrated in the axial direction. The support member 11 is guided to the other end surface R side by through holes 126 and 127.

A through hole 126 is provided on the other end side of the support member 11.
- 127, a recess 117 for housing the magnetically responsive switch 6 is formed, and this recess 11
A recess 116 into which the magnet 5 is inserted is formed at an appropriate interval from the recess 116 and a slit 115 through which the magnetic shielding plate 102 is inserted and removed between the recesses 116 and 117.
has been formed.

To attach the magnetically responsive switch 6 and the temperature sensing element 7 to the support member 11 having the above structure, as shown in FIGS. 16 and 17, the temperature sensing element 7 While passing the lead wires 71, 71 through the through holes 122, 123,
The lead wires 61, 61 of the magnetically responsive switch 6 are inserted into the through holes 126, 12 from the other end side of the support member 11.
7 and guide it to the one end surface A side where the temperature sensing element 7 is located, and then the tip thereof is inserted into the through holes 122, 12.
3, make a U-turn, guide it to the other end side, and tighten the lead wires 61, 61 together with the lead wires 71, 71. This allows the temperature sensing element 7 to move into the recess 114.
Also, the magnetically responsive switches 6 are positioned within the recesses 117, respectively.

Of course, this embodiment also provides the same effects as those of the previous embodiment, but furthermore, by tightening the lead wires 61 and 71, the temperature sensing element 7
Since the magnetically responsive switch 6 can be mounted on the support member 11, the work of mounting the temperature sensing element 7 and the magnetically responsive switch 6 on the supporting member 11 is facilitated, and at the same time, the mounting stability is improved.

<Effects of the invention> As described above, according to the invention, the following effects can be obtained.

(a) The support member is made of heat-resistant insulating resin integrally molded and has a recess for housing the switch and temperature-sensing element, so the switch and temperature-sensing element can be integrated on the support member to form a unit. It is easy to assemble, and by utilizing the electrical insulation properties of the support member molded body, it is possible to support the switch, the temperature sensing element and its lead wires, and to ensure electrical insulation.
There is no need to provide a special insulation treatment member, and a temperature detection device with a simple structure and a small number of parts can be provided.

(b) The support member has a radial length that allows the support member to be fitted in sliding contact with the inside of the cover member with a portion along the inner circumferential surface of the cover member, and the cover member includes the support member and Since the supporting member is clamped and fixed by the bent piece formed on one end facing the bottom of the case and the lid provided on the other end, the supporting member can be simply fitted into the cover member. It is possible to provide a temperature detection device that can be accurately positioned and perform stable and reliable temperature measuring and switching operations with a simple operation.

(c) Since the support member is fitted inside the cover member, the cover member can be used as a support member, a protective case for the temperature sensing element and the switch, and has an excellent protective function for these parts. It is possible to provide a temperature detection device that is easy to handle and assemble by integrating it into one component.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a temperature detection device according to the present invention, FIG. 2 is an assembled sectional view thereof, FIG. 3 is a plan view of a support member constituting the temperature detection device according to the present invention, and FIG. Similarly, FIG. 3 is a sectional view taken along the line _A1 - _A1 , FIG. 5 is a side view, FIG. 6 is a bottom view, and FIG. 7 is a side view showing the mounting structure of the temperature sensing element and magnetically responsive switch on the support member. A cutaway view, FIG. 8 is a plan view of another embodiment of the support member, and FIG. 9 is a sectional view taken along line A ₂ - A ₂ in FIG.
Figure 10 is a sectional view taken along line A ₃ - A ₃ in Figure 8;
FIG. 11 is an exploded perspective view showing the mounting structure of the temperature sensing element, magnetically responsive switch, and magnet on the support member shown in FIGS. 8 to 10, and FIG. A plan view, Figure 13 is a sectional view taken along line _A4 - _A4 in Figure 12,
FIG. 14 is a sectional view taken along line A ₅ - _{A 5} in FIG. 12, FIG. 15 is a bottom view, and FIGS. FIG. 18 is a front partial sectional view of a conventional temperature detecting device, and FIG. 19 is a front partial sectional view of the same in use. DESCRIPTION OF SYMBOLS 1... Storage case, 3... Movable body, 4... Spring, 5... Magnet, 6... Magnetic response switch, 7... Temperature sensing element, 11... Support member.

Claims (1)

[Scope of Claim for Utility Model Registration] A movable body that is supported by a spring so as to be movable and moves back and forth depending on the presence or absence of a heated object, a switch that is turned on and off by the forward and backward movements of the movable body, and a switch provided on the movable body. A temperature sensing device includes a temperature sensing element that detects the temperature of the object to be heated, and a case that supports the spring and the movable body, wherein the movable body includes a support member and a cylindrical cover member. The support member is formed of a heat-resistant insulating resin integrally molded body, has a recessed portion for accommodating the switch and the temperature sensing element, and a portion thereof extends along the inner circumferential surface of the cover member. The cover member has a radial length that can be fitted in sliding contact with the inside of the cover member in a hanging state, and the cover member houses the support member and is formed on one end surface facing the bottom surface of the case. A temperature detection device in which the support member is clamped and fixed by the bent piece and a lid provided on the other end side.