Temperature-controllable electric heating device based on paraffin phase change

Abstract

The utility model relates to the technical field of electric heating devices, in particular to a temperature-controllable electric heating device based on paraffin phase change, which comprises a heating switch, the heating switch comprises a container with an opening at the top, the bottom of the inner side of the container is filled with paraffin, and a conductive metal block is placed at the top of the paraffin; the container cover is fixedly connected to the top of the container; one end of the wire is electrically connected to the device cover, and the other end of the wire is electrically connected to the conductive metal block; the heating resistance wire is electrically connected to the wire, the wire is externally connected with a power supply, and the heating resistance wire is in contact with the bottom of the container; through phase change of paraffin, when the paraffin is in a solid state, the top of the conductive metal block is in contact with the container cover, the circuit is connected, the temperature of the heating resistance wire is transmitted to the container, when the temperature of the container exceeds the phase change temperature of the paraffin, the paraffin begins to melt, the conductive metal sinks and does not make contact with the container cover, then the circuit is disconnected, and finally the temperature is controllable. The cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating devices, in particular to a temperature-controllable electric heating device based on paraffin phase change. Background Art

[0002] When heating objects in containers on a daily basis, some items have certain requirements for the heating temperature range. For example, if the heating temperature of milk exceeds 70 degrees, the nutritional value will be discounted. Therefore, electric heating devices that can control the temperature have broader application prospects.

[0003] The publication number is CN210187194U. It is an automatic temperature-controlled electric heating device for experiments. An opening is set at the bottom of the electric heating sleeve and a fan is installed. When the temperature of the material in the flask is too high, the electric heating sleeve stops heating and the fan quickly cools the material. When the temperature is too low, the fan stops and the electric heating sleeve reheats. It can control the temperature of the material in the flask at a constant temperature within a certain temperature range and reduce the production of side reactions during the reaction. However, the principle of controlling temperature is based on temperature sensing elements, which is costly. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a temperature-controllable electric heating device based on paraffin phase change to solve the above-mentioned problems.

[0005] Based on the above purpose, the utility model provides a temperature-controllable electric heating device based on paraffin phase change, comprising:

[0006] A heating switch, the heating switch comprising a container with an opening at the top, the bottom of the inner side of the container is filled with paraffin, and a conductive metal block is placed on the top of the paraffin;

[0007] A cover, fixedly connected to the top of the container;

[0008] A wire, one end of which is electrically connected to the device cover, and the other end of which is electrically connected to the conductive metal block;

[0009] The heating resistance wire is electrically connected to the conductive wire, the conductive wire is externally connected to a power source, and the heating resistance wire is in contact with the bottom of the container.

[0010] As an optional implementation, when the paraffin is converted from a solid state to a liquid state, the conductive metal block slides out of the container and does not contact the cover.

[0011] As an optional implementation, the conductive metal block is made of copper.

[0012] As an optional embodiment, the phase change temperature of the paraffin is seventy degrees.

[0013] The beneficial effects of the utility model are as follows: the utility model realizes the phase change of paraffin. When the paraffin is solid, the top of the conductive metal block contacts the cover, the circuit is connected, and the temperature of the heating resistance wire is transmitted to the container. When the temperature of the container exceeds the phase change temperature of the paraffin, the paraffin begins to melt, causing the conductive metal to sink and not contact the cover, thereby disconnecting the circuit, and finally making the temperature controllable with low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a schematic diagram of the phase change liquefaction of paraffin in an embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the phase change solidification of paraffin in an embodiment of the utility model.

[0017] The markings in the figure are:

[0018] 1. Heating resistance wire; 2. Wire; 3. Cover; 4. Container; 5. Conductive metal block; 6. Paraffin. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] like Figure 1 , Figure 2As shown, a temperature-controllable electric heating device based on the phase change of paraffin 6 comprises:

[0022] A heating switch, the heating switch comprises a container 4 with an opening at the top, the bottom of the container 4 is filled with paraffin 6, and a conductive metal block 5 is placed on the top of the paraffin 6;

[0023] A cover 3, fixedly connected to the top of the container 4;

[0024] A wire 2, one end of which is electrically connected to the cover 3, and the other end of which is electrically connected to the conductive metal block 5;

[0025] A heating resistance wire 1 is electrically connected to the wire 2, the wire 2 is externally connected to a power source, and the heating resistance wire 1 is in contact with the bottom of the container 4;

[0026] In this embodiment, when the paraffin 6 is in a solid state, the top of the conductive metal block 5 is in contact with the cover 3, the circuit is connected, and the temperature of the heating resistor 1 is transmitted to the container 4. When the temperature of the container 4 exceeds the phase change temperature of the paraffin 6, the paraffin 6 begins to melt, causing the conductive metal to sink and not in contact with the cover 3, thereby disconnecting the circuit and finally making the temperature controllable.

[0027] As an optional implementation, Figure 1 As shown, when the paraffin 6 is transformed from solid to liquid, the conductive metal block 5 slides out of the container 4 and does not contact the cover 3;

[0028] In this way, the conductive metal will drop from the container 4 without the support of the wax 6 .

[0029] As an optional implementation, the conductive metal block 5 is made of copper;

[0030] In this way, the conductive metal block 5 is facilitated to conduct electricity.

[0031] As an optional implementation, the phase change temperature of the paraffin 6 is seventy degrees.

Claims

1. A temperature-controllable electric heating device based on the phase change of paraffin (6), characterized in that: include: A heating switch, the heating switch comprising a container (4) with an opening at the top, the bottom of the inner side of the container (4) being filled with paraffin (6), and a conductive metal block (5) being placed on the top of the paraffin (6); A cover (3) fixedly connected to the top of the container (4); A wire (2), one end of which is electrically connected to the device cover (3), and the other end of which is electrically connected to the conductive metal block (5); The heating resistance wire (1) is electrically connected to the conductive wire (2), the conductive wire (2) is externally connected to a power source, and the heating resistance wire (1) is in contact with the bottom of the container (4).

2. A temperature-controllable electric heating device based on phase change of paraffin (6) according to claim 1, characterized in that: When the paraffin (6) is transformed from a solid state to a liquid state, the conductive metal block (5) slides out of the container (4) and does not contact the cover (3).

3. A temperature-controllable electric heating device based on phase change of paraffin (6) according to claim 1, characterized in that: The conductive metal block (5) is made of red copper.

4. A temperature-controllable electric heating device based on phase change of paraffin (6) according to claim 1, characterized in that: The phase transition temperature of the paraffin (6) is seventy degrees.

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