JPH0719459Y2 - Heater for medical polymeric materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a heater for heating a medical polymerization material such as a dental technical material or a biomaterial, and particularly to heating the medical polymerization material to a constant temperature. It relates to a heater that keeps the temperature.

(Prior Art) In a conventional heater for a medical polymerizable material, as shown in FIG. 5, a heating internal space 52 for accommodating a device to be heated O is formed in a container 51 having a relatively small heat capacity, and the container 51 is heated. ON / OFF of the temperature sensitive switch TS such as a thermostat in which the heater 53 is provided on one outer wall surface and the heater 53 is provided on the inner peripheral wall 51a of the container 51.
The heating internal space 52 is controlled to obtain a constant heating temperature.

Further, in another heater as shown in FIG. 6, the temperature is detected by the temperature detecting element TE provided in the heating inner space 52, and the heater 53 is controlled in place of the simple ON / OFF control. PID (Proportional Integr) via circuit 55 and control element 54
It was trying to realize heating at a constant temperature by performing control such as al differential).

(Problems to be solved by the invention) First, in the former conventional heater, a temperature sensitive switch is used.
Although it is configured inexpensively by using ON / OFF control by TS,
Since the container 51 has a small heat capacity, it is greatly affected by the ambient environmental temperature, and the temperature-sensitive switch TS is separated from the heater 53, so that the control is delayed as shown in FIG. It is greatly affected by temperature fluctuations. Therefore, the temperature distribution in the container 51 and the heating internal space 52 was not uniform, and it was difficult to maintain a constant heating temperature. Also,
Since the temperature cannot be controlled to be constant, it was difficult to perform variable temperature control.

In the latter conventional heater, the temperature detection element TE
Control circuit 55 processes the detected temperature signal from
The heat generation of the heater 53 is controlled via 54 to obtain a constant heating temperature.
54, the power supply 56 for the control circuit was required, and the size was increased, resulting in high material costs and man-hours for manufacturing, resulting in high cost.
Moreover, although the container 51 has a large heat resistance and a small heat capacity, although the control circuit 55 is provided, the temperature distribution is not always constant, and there is a problem that an overshoot peculiar to this type of control occurs. Was.

The present invention has been devised in view of the above-mentioned conventional problems, and has the same constant temperature holding performance as a heater using a conventional temperature detecting element and a control circuit, and has no overshoot. The temperature distribution in the internal space can be made uniform and almost no temperature fluctuations can be achieved, and the size and cost can be reduced as much as the ON / OFF temperature control type heater, and the heating temperature can be changed as necessary. It is an object of the present invention to provide a heater for a medical-use polymerized material, which can realize a temperature that can be achieved and has almost no effect on the ambient temperature.

(Means for Solving the Problems) In order to achieve the above object, the configuration of the heater for a medical polymerizable material of the present invention will be described in detail with reference to the examples corresponding to the examples. The present invention has good thermal conductivity and A heating container 1 made of a metal material having a heat capacity larger than that of a material to be heated, a lid 2 configured to be openable and closable with respect to the heating container 1, and a planar heating element provided in contact with the outside of the heating container 1. 3 and a thermostat 4 which is provided in contact with the sheet heating element 3 and controls the sheet heating element 3 so as to keep the temperature in the heating container 1 substantially constant.
And a timer 5 for controlling the heat generation time of the sheet heating element 3.
The heat-insulating material 22 is integrated with the upper surface of a metal material having a good heat conductivity and a relatively large heat capacity, and the lid body 2 is integrated with the lid body 2 and placed on the upper surface of the heating container 1. Material heater.

(Operation) In the heater of the medical polymerizable material configured as described above, the material S to be heated such as a dental technical material or a biomaterial is used.
Is accommodated in the heated space 11 of the heating container 1 and the heat of the heating element 3 provided outside the heating container 1 is in contact with the heating element without contacting the container 1 at a constant sensitive temperature. Control. The heating container has a large heat capacity and is made of a material with low thermal resistance so that it can be heated from the outside of the container. The temperature distribution in the space 11 is also uniform. Further, since the temperature control means 4 is in contact with the heating element 3 instead of in contact with the container 1, the response is quick and the temperature fluctuation of the heating element 3 itself is reduced, and as a result, the container 1 and the heated space 11 inside thereof are reduced. It is possible to further reduce the internal temperature fluctuation.

If the temperature control means 4 can change its temperature sensitive setting or the container 1 is provided with means for changing the thermal resistance between the outside air (including the inside and outside air of the case), the entire heat flow rate can be changed. Can be changed.

Furthermore, the ratio of the thermal resistance between the heating element 3 and the temperature control means 4, the thermal resistance between the temperature control means 4 and the outside air (including the outside air inside the housing), and the thermal resistance between the heating element 3 and the container 1. If the ratio of the thermal resistance between the container and the outside air (including the outside air inside the housing) is made equal, the sensitive temperature of the temperature control means 4 (average value with hysteresis) and the temperature of the heating container 1 are Since it corresponds to 1: 1, fluctuations due to ambient temperature (outside air temperature) can be reduced to zero in principle.

(Embodiment) (Embodiment 1) FIGS. 1 and 2 show a first embodiment of the present invention.

The heater is a heating container 1, a heating element 3 housed in an outer casing 7,
Temperature control means 4 and timer 5 (however, the operating portion 6 is exposedly attached to the outer casing 7) and heating container 1
And the lid body 2 of The heating element 3 is a planar heating element, and the temperature control means 4 is a temperature sensitive switch (thermostat). As a material of the container 1, stainless steel having a heat capacity larger than that of the material S to be heated and a small heat resistance,
It is made of copper, aluminum, or the like. As the material to be heated S, a thermopolymerizable material as a dental prosthesis material is used. The lid 2 is the second
As shown in the figure, it comprises an inner lid 21 made of metal, a heat insulating material 22 and an outer lid 23. Reference numeral 8 is a main switch, and 9 is a heating display lamp.

The method of using the heater of the first embodiment having the above-described configuration is as follows: (a) The timer 5 is set to preheat. The time is preferably 7 to 8 minutes, during which the heating display lamp 9 lights up,
When the preheat time ends, the lamp 9 goes out.

(B) The material S to be heated is placed in the heating container 1.

(C) Set the timer 5 to 15 minutes as an example. The inside of the heating container 1 is maintained at about 100 ° C. to complete the thermal polymerization. During this time, the lamp 9 is on. Lamp 9 after 15 minutes
Disappears.

(D) The material S to be heated is taken out.

With the above, heat polymerization is completed.

In this example, the heating container 1 is made of a material having a relatively large capacity and a small thermal resistance, and since the heating container 1 is covered with the lid body 2, the space to be heated due to the fluctuation of the outside air temperature.
The temperature influence on 11 is small, and since the temperature control means 4 is in contact with the heating element 3, the temperature error from the control system is small and the control response is good. If the configuration shown in the figure is adopted as the lid body 2, it does not become hot even if the lid body 2 is held and opened and closed by hand, and the structure can be simplified and the manufacturing cost is low.

(Embodiment 2) FIG. 3 shows a longitudinal sectional view of a main portion of a second embodiment.

This example is a special water tank switch as the temperature control means 4.
In the example in which 12 is provided between the bottom of the heating container 1 and the heating element 3,
In the water tank switch 12, a pressure switch valve 122 which also functions as a relief valve is attached to one end of a closed container 121 filled with water, and the heating container 1 and the heating element 3 are thermally conductively coupled to each other. This switch 12 utilizes the fact that the boiling point of water at 1 atm is 100 ° C.
When boiling at 00 ° C. and boiling continues and the pressure inside the container 121 exceeds 1 atm, the pressure switch valve 122 is opened and the container 121 is opened.
The inside is kept at 1 atm and the power supply to the heating element 3 is turned off.
Then, when the pressure inside the container 121 is maintained at 1 atm again, the power supply to the heating element 3 is turned on. The water tank switch 12 is a kind of control switch for keeping the temperature inside the container 1 at about 100 ° C. by using 1 atmospheric pressure as a sensing medium. In this example, the temperature sensitive switch 4 as in the previous example is unnecessary.

The other configuration of this example is the same as that of the previous example, and thus the description thereof is omitted.

In addition, the following is mentioned as a modification aspect of this invention.

(I) Instead of placing the lid 2 on the upper surface of the heating container 1 as in the embodiment, a hinged horizontal door may be used.

(Ii) The water tank switch 12 may be formed integrally with the lower part of the container 1 instead of being a separate member from the heating container 1.

FIG. 4 shows a temperature one-hour diagram using the heater of Example 1. As is clear from the figure, according to this plan, the control system is turned off.
It can be seen that the response of the target temperature to the temperature and ON temperature is fast and there is no change in the target temperature due to the outside air temperature.

(Effect of the Invention) Since the present invention is configured as described above, the conventional temperature detecting element and the control circuit are used to suppress the overshoot with a simple control of only the on / off of the heating operation of the heating element. Achieves a constant temperature superior to the controlled heater,
The temperature distribution of the heated space can be made uniform, and at the same time, the heater can be downsized and the manufacturing cost can be reduced.

In addition, by reducing the fluctuation range of the heating temperature, it is possible to change and set the heating temperature with almost no change in cost as needed, and it is also possible to have a structure that is hardly affected by the ambient outside temperature. .

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a heater for a medically polymerized material of the present invention, FIG. 2 is a vertical sectional view of FIG. 1, and FIG. 3 is a longitudinal sectional view of an essential part showing a second embodiment. Fig. 4, Fig. 4 is a temperature-time diagram showing the operating performance of the heater of the present invention, Fig. 5 is a schematic diagram showing a first example of a conventional heater for a medical polymerizable material, and Fig. 6 is a second diagram. FIG. 7 is a schematic diagram of an example, and is a temperature-time diagram showing the operating performance of the first conventional example. (Explanation of Codes) 1 ... Heating container for medical-use polymerized material, S ... Heated material, 11 ...
Heated space, 2 ... Lid body, 3 ... Heating element, 4 ... Temperature control means, 5 ... Timer, 6 ... Timer operation unit, 7 ... Outer housing, 8
… Main switch, 9… Heating indicator lamp, 12… Water tank switch.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H05B 3/00 310 C 7715-3K

Claims (2)

[Scope of utility model registration request] 1. A heating container made of a metal material having good thermal conductivity and a heat capacity larger than that of a material to be heated, a lid body configured to be openable and closable with respect to the heating container, and contacting the outside of the heating container. Of the sheet heating element, a thermostat that is provided in contact with the sheet heating element and controls the sheet heating element to keep the temperature in the heating container substantially constant, and It is composed of a timer for controlling heat generation time, and the lid body is integrated with an upper surface of a metal material having a good heat conductivity and a relatively large heat capacity by incorporating a heat insulating material, and is placed on the upper surface of the heating container. Heater for medically polymerized materials. 2. The heating container is maintained at about 1 atm at all times.
The heating according to claim 1, further comprising: a water tank incorporating a pressure switch for emitting an ON-OFF signal, the water tank being provided between the heater and the heater, and the temperature control means controlling the heating element by the ON-OFF signal from the pressure switch. vessel.