JPH054233Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric heater with a temperature controller used to adjust the temperature of the electric heater to a set temperature.

[Prior Art] Conventionally, electric heaters have a
There is an electric heater in which a heating wire 3 and terminals 4 connected to both ends of the heating wire 3 are fixed inside a metal tube 1 with one end closed through an electric insulator 2. In this electric heater 9, a thermocouple 6 is embedded in an electric insulator 2. Lead wire 7 to thermocouple 6
is connected, and this lead wire 7 is connected to a temperature controller 8.

On the other hand, the terminal 4 is connected in series between the power supply 9 via a power switch 10 and a relay contact 11 driven by a relay provided in the temperature controller 8.

Therefore, the internal temperature of the electric heater is detected by the thermocouple 6, and the relay contact 11 is turned on and off by the temperature controller 8, so that the electric heater is maintained at the set temperature.

[Problems to be solved by the invention] However, the temperature controller 8 and the electric heater are separate bodies, and the electric heater is attached to the object to be heated, and the temperature controller 8 and the relay contact 1 are
The work is difficult because the parts such as 1 must be wired and installed in different locations.

Further, unless the temperature controller 8 is provided apart from the high-temperature part, it cannot be integrated because the heat will have an adverse effect, and the temperature controller 8 also has a complicated mechanism and is expensive.

Therefore, an object of the present invention is to provide an electric heater with a temperature controller that can be easily assembled and installed by integrating the electric heater and the temperature controller.

[Means for Solving the Problems] The electric heater with a temperature controller of the present invention has a temperature detecting section protruding from one side of an insulating housing containing a temperature regulating section, and In the electric heater with a temperature regulator, the temperature detecting section includes a heat-sensitive cylinder made of a high thermal expansion metal material with one end closed, and one end fixed to the closed part of the heat-sensitive cylinder, and the other end fixed to the closed part of the heat-sensitive cylinder. The electric heater has a low thermal expansion metal rod connected to a movable spring provided on the opening side of the heat-sensitive cylinder, and the electric heater has a heating wire and a terminal connected to the heating wire in a protective metal tube with one end closed. The heating wire and the terminal are connected between the heat-sensitive tube and the protective metal tube,
Temperature control characterized in that the terminal fixed through an electrical insulator and protruding from the protective metal tube is connected to a conductive contact in the housing, and the housing and the electric heater are integrally attached. The electric heater with a built-in device and the above-mentioned electric heater have a heat-receiving tube made of a metal material and installed at a predetermined position by inserting a heat-sensitive tube made of a high-expansion metal material, and an electric insulator is interposed between the heat-receiving tube and the protective metal tube. An electric heater with a temperature controller is obtained, which is characterized in that the heating wire is fixed.

[Function] When adjusting the temperature of an electric heater using the temperature control section, the difference in thermal expansion between the heat-sensitive cylinder and the metal rod is used to operate the actuator to connect and separate the contacts, and the on/off of the contacts is mechanically controlled. to be done.

A flange or support is fixed to the electric heater, and a housing is fixed to the flange or support. As a result, the electric heater and the housing are fixed together, and the electric heater is provided on the object to be heated, such as a fluid or solid object, and heating is performed while controlling the temperature.

[Embodiment] FIGS. 1 and 2 show an embodiment of an electric heater with a temperature controller according to the present invention.

The illustrated electric heater with a temperature regulator includes a temperature regulator and an electric heater integrally attached to the temperature regulator. The temperature controller includes an electrically insulating housing 22 containing a temperature adjustment section 21.
and a temperature detection section 23 provided to protrude from one side of the housing 22.

The temperature detection section 23 includes a heat-sensitive tube 24 formed of a high-expansion metal material with one end closed, and a heat-sensitive tube 24
It has a low expansion metal rod 25 provided inside. One end of the metal rod 25 is connected to the closed portion of the heat-sensitive cylinder 24. The other end of the metal rod 25 is connected to a movable spring 27 provided on the open side of the other end of the heat-sensitive tube 24. One end of the movable spring 27 is connected to the heat-sensitive cylinder 24, and the other end of the movable spring 27, which extends outward from the opening side of the heat-sensitive cylinder 24, is provided with an actuator 28 formed of an insulator. There is.

On the other hand, the temperature adjustment section 21 includes a movable contact spring 30 that is movable by the pressure of a movable spring 27, and a fixed contact spring 31 that is provided opposite to the movable contact spring 30.
It has Contacts 33 that electrically open and close the movable contact spring 30 and the fixed contact spring 31 are provided on opposing surfaces of the movable contact spring 30 and the fixed contact spring 31, making contact or non-contact with each other. One side of the movable contact spring 30 extends above the actuator 28 of the movable spring 27.

The other end of the movable contact spring 30 is fixed together with the other end of the fixed contact spring 31 by a fixed insulator 32. The upper surface of the fixed contact spring 31 has a housing 2
The tip of an adjustment rod 35 is provided through the top plate of the fixed contact spring 31 in a direction perpendicular to the top surface of the fixed contact spring 31. The adjustment rod 35 extends through a hole (not shown) formed in the movable contact spring 30. This adjustment rod 35 has a threaded portion 37 formed in its middle portion. This threaded portion 37 is screwed into a threaded portion formed on the top plate of the housing 22. The upper part of the adjustment rod 35 protrudes outward from the upper surface of the housing 22, and a temperature control knob 38 is fitted into this protrusion.

Further, inside the housing 22, a conductive contact 40 such as a socket contact is provided toward one side of the housing 22, that is, the one side from which the heat-sensitive cylinder 24 projects.

Holes (not shown) are formed in one side of the housing 22 facing the contacts 40 so as to face each other. Terminals 42 protruding from one end of the electric heater fit into these holes to establish electrical contact.

The electric heater has a protective metal tube 45 and a heating wire 47 fixed inside the protective metal tube 45 via an electrical insulator 46. A terminal 42 is connected to the end of the heating wire 47.

Therefore, the heating wire 47 and the terminal 42 are fixed inside the protective metal tube 45 by the electrical insulator 46, and the terminal 42 protrudes from one end which is the opening of the protective metal tube 45 and is connected to the contact 40. ing. Inside this electric heater, there is a protective metal cylinder 45 that protrudes from the housing 22.
It's decorated.

That is, the heat-sensitive tube 24 is installed inside the protective metal tube 45 in the axial direction. Heating wire 47 and terminal 4
2 is an electrical insulator 4 so as not to come into contact with the outer wall surface of the heat-sensitive tube 24 and the inner wall surface of the protective metal tube 45.
6, it is fixed between the protective metal tube 45 and the heat-sensitive cylinder 24. A metal flange 50 is fixed to the open end of the protective metal tube 45.

The flange 50 is fixed to the open end of the protective metal tube 45 by welding. A through hole 51 for penetrating the terminal 42 and the heat-sensitive tube 24 is formed in the center of the flange 50. One side of the housing 22 and a mounting plate 55 extending from this one side toward the outer peripheral end of the flange 50 are in contact with the opposite side of the flange 50, that is, the side opposite to the electric heater. A plurality of screw holes 57 are formed in the mounting plate 55. Screw holes 58 are formed in the flange 50 at the same positions as these screw holes 57. Screws 59 are screwed into these screw holes 58 to fix the flange 50 and the housing 22 together.

Furthermore, a sealant 60 having electrical insulation properties is provided at the open end of the protective metal tube 45 . This sealant 60 provides electrical insulation between the heat-sensitive tube 24, the terminal 42, and the protective metal tube 45. Inside the housing 22, one contact 4 is connected to one terminal 42.
0 and one power cord 62 are connected.

The other contact 40 connected to the other terminal 42 is connected to the movable contact spring 30. The other power cord 62 is connected to the fixed contact spring 31.

By rotating the temperature control knob 38,
Since the adjustment rod 35 moves up and down, the opening/closing temperature is adjusted by adjusting the position of the fixed contact spring 31. The tip of the movable contact spring 30 and the movable spring 27
The actuator 28 at the tip of the movable spring 27 faces each other, and when the metal rod 25 is exposed to heat and expands, it is pulled against the heat-sensitive tube 24 because it is made of a low-expansion material, and the actuator 28 at the tip of the movable spring 27 moves into the movable contact spring. Push 30.

Therefore, the contacts 33 provided on the movable contact spring 30 and the fixed contact spring 31 perform opening and closing operations.

That is, when adjusting the temperature, this temperature regulator 21 operates the actuator 28 to connect and separate the contacts 33 based on the difference in thermal expansion between the heat-sensitive tube 24 and the metal rod 25 made of a low expansion material. It responds to temperature changes by turning on and off mechanically. In this electric heater with a temperature controller, the protective metal tube 45 is made of iron,
Metal materials such as stainless steel, Inconel, or titanium are used.

Magnesia, alumina, etc. are used as the electrical insulating material 46, and such electrical insulating material 46 can be made into a powder and filled inside the protective metal tube 45, or formed into a bobbin shape in advance and used as a powder for the protective metal tube 45. Insert inside.

FIG. 3 shows another embodiment of the electric heater with temperature controller. In this embodiment, the same parts as in FIG. 1 are denoted by the same reference numerals, and their explanation will be omitted.
A metal heat receiving tube 70 for inserting the heat sensitive tube 25 into the electric heater and storing it in a predetermined position.
is provided. This heat receiving tube 70 is a heating wire 47
They are installed at an insulating distance so that they do not come into contact with the A ring-shaped support 72 is fixed to the opening side of the protective metal tube 45. The housing 22 is integrally fixed to this support body 72 with screws 73.

This electric heater with temperature regulator can be used, for example, to heat fluids or solids.
If the device is used for liquids, it can be attached to containers containing liquids or to pipes that guide liquids. Further, when heating a solid, a hole is formed in the solid for inserting the protective metal tube 45, and an electric heater is inserted into the hole to heat the solid.

Incidentally, if the housing 22 is assembled vertically in a bivalve manner, wiring of the terminal 42 and the power cord 62 can be easily made.

[Effects of the invention] As explained above using the embodiments, according to the electric heater with a temperature controller of the present invention, the electric heater and the housing containing the temperature adjustment part can be easily attached using flanges or supporting metal fittings. ,
Assembly and wiring work becomes easier.

Further, since the electric heater and the housing are integrally attached, it is easy to carry, and a compact electric heater with a temperature controller that does not take up much space can be obtained.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the electric heater with temperature regulator of the present invention, and is a side view with the main parts cut away, Fig. 2 is an exploded perspective view of the main parts of Fig. 1, and Fig. 3 is the present invention. FIG. 4 is a cross-sectional side view of a main part of another embodiment of an electric heater with a temperature regulator, and FIG. 4 is a cross-sectional side view of a main part of a conventional electric heater. 21...Temperature adjustment section, 22...Housing, 2
3...Temperature detection unit, 24...Thermosensitive tube, 25...Metal rod, 27...Movable spring, 30...Movable contact spring, 33...Contact, 35...Adjustment rod, 40
...Contact, 42...Terminal, 45...
Protective metal tube, 47... Heat generating wire, 50... Flange, 70... Heat receiving tube, 72... Support body.

Claims (1)

[Claims for Utility Model Registration] 1. An electric heater with a temperature controller, which includes a temperature detecting section protruding from one side of an insulating housing containing a temperature regulating section, and an electric heater containing this temperature detecting section. In the above, the temperature detecting section includes a heat-sensitive tube made of a high thermal expansion metal material with one end closed, and a movable spring having one end fixed to the closed part of the heat-sensitive tube and the other end provided on the open side of the heat-sensitive tube. It has a low thermal expansion metal rod connected to it,
The electric heater has a heating wire and a terminal connected to the heating wire in a protective metal tube with one end closed, and the heating wire and the terminal are electrically insulated between the heat-sensitive tube and the protective metal tube. An electric heater with a temperature controller, characterized in that the terminal is fixed through an object and protrudes from the protective metal tube, and is provided in the housing, and the housing and the electric heater are integrally attached. 2. The electric heater has a heat-receiving tube made of a metal material and installed at a predetermined position by inserting a heat-sensitive tube made of a high-expansion metal material, and a heating wire is inserted between the heat-receiving tube and the protective metal tube via an electrical insulator. An electric heater with a temperature controller that is fixed.