A tubular furnace

Abstract

This utility model relates to a tube furnace, including a box-type furnace body, a furnace cover, a furnace tube, a heating element, and a sample crucible. One side of the furnace cover is hinged to the box-type furnace body; when closed, the furnace cover and the box-type furnace body enclose a chamber. The heating element is disposed within the inner wall of the chamber. The furnace tube is inserted through the chamber, with both ends protruding. The sample crucible is used to hold samples and is pushed into the furnace tube. A sealing structure is provided between the furnace tube and the side wall of the chamber. The sealing structure includes a sealing strip and a groove formed on the side wall of the chamber. When the furnace cover and the box-type furnace body are closed, the sealing strip is embedded in the groove to seal the gap between the furnace tube and the side wall of the chamber. By providing a sealing structure between the furnace tube and the side wall of the chamber, the sealing performance is improved; the problem of hot gas escaping from between the furnace body and the furnace tube during heating is avoided; the risk of burns to laboratory personnel and the problem of increased energy consumption are eliminated; the use of a groove and a sealing strip filling the groove when closed results in a simple structure and low sealing cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of heating equipment, specifically relating to a tubular furnace. Background Technology

[0002] Furnaces are common heating devices widely used in industries such as metallurgy, ceramics, glass, plastics, and heat treatment for processes such as calcination, purification, drying, quenching, and sintering of samples, with heating temperatures reaching over 1700℃. Furnaces can be classified into vertical furnaces, square furnaces, and cylindrical furnaces, depending on their type. Among these, tube furnaces are an important type of cylindrical furnace.

[0003] A tube furnace mainly consists of furnace tubes, heating elements, a temperature control system, and an atmosphere control system. The furnace generates heat by passing an electric current through the heating elements, which then transfers the heat to the furnace tubes and the materials inside. Simultaneously, thermocouples measure the temperature and provide feedback to the temperature control system, which automatically adjusts the heating element power according to the set value to maintain a stable temperature. Furthermore, the atmosphere inside the furnace can be controlled by a gas flow control system. In laboratory applications of tube furnaces for catalyst sintering, it was observed that hot gas escaped from the furnace body at the connection between the furnace body and the furnace tubes; this poses a risk of burns to laboratory personnel and increases energy consumption. Utility Model Content

[0004] To address the problem of hot gas escaping from the furnace body at the connection between the furnace body and the furnace tubes, this invention provides a tubular furnace. To achieve the above objective, the specific technical solution adopted by this invention is as follows:

[0005] A tubular furnace includes a box-type furnace body, a furnace cover, a furnace tube, a heating element, and a sample crucible. One side of the furnace cover is hinged to the box-type furnace body; when closed, the furnace cover and the box-type furnace body enclose a chamber. The heating element is disposed within the inner wall of the chamber for heating the chamber. The furnace tube is inserted through the chamber, with both ends protruding. The sample crucible is used to hold a sample and is pushed into the furnace tube. A sealing structure is provided between the furnace tube and the side wall of the chamber. The sealing structure includes a sealing strip and a groove formed on the side wall of the chamber. When the furnace cover and the box-type furnace body are closed, the sealing strip is embedded in the groove to seal the gap between the furnace tube and the side wall of the chamber.

[0006] The beneficial effects of this utility model of a tube furnace are as follows: by setting a sealing structure between the furnace tube and the side wall of the chamber, the sealing performance is improved; the problem of hot gas escaping from between the furnace body and the furnace tube during heating is avoided; the risk of burns to experimental personnel and the problem of increased energy consumption are eliminated; the method of using a groove and filling the groove with a sealing strip when fastening results in a simple structure and low sealing cost.

[0007] Furthermore, an annular boss is provided on the furnace tube. The cross-section of the annular boss is trapezoidal. The position and shape of the annular boss are adapted to the position of the groove. When the furnace cover and the box-type furnace body are fastened together, the annular boss is inserted into the groove.

[0008] Beneficial effects: The annular boss and the groove cooperate to change the gap between the furnace tube and the side wall of the chamber from a straight line to a "U" shape, increasing the mating area and improving the sealing effect.

[0009] Furthermore, the heating element includes a plurality of heating rods, which are evenly spaced along the circumference of the furnace tube within the box-type furnace body and the furnace cover; the plurality of heating rods are connected in parallel.

[0010] Beneficial effects: The heating rods are evenly spaced along the circumference of the furnace tube, which makes the furnace tube heat up evenly and improves the uniformity of temperature inside the furnace tube.

[0011] Furthermore, the furnace tube includes a tube body, a first plug, a second plug, and a temperature measuring probe. The first plug and the second plug are respectively embedded at both ends of the tube body, and the temperature measuring probe is inserted into the first plug for detecting the temperature inside the tube body.

[0012] Beneficial effects: The tube body, the first plug, and the second plug form a chamber for holding samples; the temperature measurement probe is used to monitor the temperature inside the furnace tube in real time.

[0013] Furthermore, the furnace tube also includes an inlet pipe and an exhaust pipe, the inlet pipe being inserted into the second plug and the exhaust pipe being inserted into the first plug; a valve is provided on the inlet pipe and a one-way valve is provided on the exhaust pipe, the one-way valve being open from the pipe body to the outside and stopping from the outside into the pipe body.

[0014] Beneficial effects: By setting up an inlet pipe and an outlet pipe, gas is injected into the furnace tube to achieve heating of samples under different atmospheres; a one-way valve is set on the outlet pipe so that when the furnace tube is heated, the gas pressure inside the furnace tube increases and is discharged through the one-way valve and the outlet pipe; thus maintaining balance.

[0015] Furthermore, the sample crucible includes a strip-shaped pot body, the sidewall of which is an arc-shaped sidewall that is adapted to the inner sidewall of the tube body.

[0016] Beneficial effects: By setting the arc-shaped sidewall, the stability of the sample crucible in the furnace tube is improved, reducing or avoiding the sample crucible tipping over when pushed into the furnace tube and scattering the sample into the furnace tube.

[0017] Furthermore, the sample crucible also includes a lid, with a notch on the inner edge of the strip-shaped crucible body; when the lid is closed, the edge of the lid is inserted into the notch. The wall thickness of the strip-shaped crucible body and the lid is controlled between 10 mm and 12 mm.

[0018] Beneficial effects: By setting a lid, the wall thickness of the lid and the strip-shaped pot body are the same and controlled within 10mm to 12mm; this facilitates uniform heating of the sample in the sample crucible and improves the test results. Attached Figure Description

[0019] Figure 1 This is a perspective view of an embodiment of the tubular furnace of this utility model;

[0020] Figure 2 This is a three-dimensional schematic diagram of the furnace tube in an embodiment of the tubular furnace of this utility model;

[0021] Figure 3 This is a three-dimensional schematic diagram of the furnace cover of an embodiment of the tubular furnace of this utility model;

[0022] Figure 4 This is a three-dimensional schematic diagram of the sample crucible of an embodiment of the tube furnace of this utility model.

[0023] Numbering in the diagram: 1-Box-type furnace body, 2-Furnace cover, 3-Furnace tube, 31-Tube body, 32-First plug, 33-Second plug, 34-Temperature measuring probe, 35-Inlet pipe, 36-Exhaust pipe, 37-Valve, 38-One-way valve, 4-Heating element, 51-Strip-shaped pot body, 52-Pot lid, 53-Arc-shaped side wall, 6-Sealing strip, 7-Annular boss. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] The specific structure of the embodiment of the tubular furnace of this utility model is as follows: Figure 1 and Figure 2 As shown, the furnace includes a box-type furnace body 1, a furnace cover 2, a furnace tube 3, a heating element 4, and a sample crucible. One side of the furnace cover 2 is hinged to the box-type furnace body 1; when closed, the furnace cover 2 and the box-type furnace body 1 enclose a chamber. The heating element 4 is located inside the inner wall of the chamber and is used to heat the chamber. The furnace tube 3 is inserted through the chamber, with both ends protruding. The sample crucible is used to hold the sample and is pushed into the furnace tube 3.

[0026] A sealing structure is provided between the furnace tube 3 and the side wall of the chamber; the sealing structure includes a sealing strip 6 and a groove formed on the side wall of the chamber. When the furnace cover 2 and the box-type furnace body 1 are fastened together, the sealing strip 6 is embedded in the groove to seal the gap between the furnace tube 3 and the side wall of the chamber. The sealing strip 6 is made of refractory cotton. In this embodiment, an annular boss 7 is provided on the furnace tube 3. The cross-section of the annular boss 7 is trapezoidal. The position and shape of the annular boss 7 are adapted to the position of the groove. When the furnace cover 2 and the box-type furnace body 1 are fastened together, the annular boss 7 is inserted into the groove; this changes the gap between the furnace tube 3 and the side wall of the chamber from a straight line to a "U" shape, increasing the mating area and improving the sealing effect. In other embodiments, no annular boss is provided on the tube; the sealing strips are adhered between the furnace tube and the side wall of the chamber.

[0027] The heating element 4 includes several heating rods, which are evenly spaced around the furnace tube 3 within the box-type furnace body 1 and the furnace cover 2. The heating rods are connected in parallel. During heating, the furnace tube 3 is heated evenly, improving the temperature uniformity within the furnace tube 3. In other embodiments, the heating element is a heating wire instead of a heating rod, which is evenly spaced around the furnace tube within the box-type furnace body and the furnace cover.

[0028] In this embodiment, as Figure 2 As shown, the furnace tube 3 includes a tube body 31, a first plug 32, a second plug 33, a temperature measuring probe 34, an inlet pipe 35, and an exhaust pipe 36. The first plug 32 and the second plug 33 are respectively sealed and embedded at both ends of the tube body 31. The first plug 32 and the second plug 33 each include a flange and a plunger. The temperature measuring probe 34 is inserted into the first plug 32 and is used to detect the temperature inside the tube body 31. The plunger of the second plug 33 is threadedly connected to the tube body 31; it is removable during use.

[0029] An inlet pipe 35 is inserted into the second plug 33, and an exhaust pipe 36 is inserted into the first plug 32. A valve 37 is installed on the inlet pipe 35, and a one-way valve 38 is installed on the exhaust pipe 36. The one-way valve 38 allows flow outward from the pipe body 31 and stops flow inward from the outside into the pipe body 31. By setting up the inlet pipe 35 and the exhaust pipe 36, gas is injected into the furnace tube 3 to achieve heating of the sample under different atmospheres. The one-way valve 38 on the exhaust pipe 36 allows the gas pressure inside the furnace tube 3 to increase when the furnace tube 3 is heated, and the gas is discharged through the one-way valve 38 and the exhaust pipe 36 to maintain balance.

[0030] In this embodiment, as Figure 4As shown, the sample crucible includes a strip-shaped pot body 51 and a lid 52. The sidewall of the strip-shaped pot body 51 is an arc-shaped sidewall 53, which is adapted to the inner sidewall of the tube 31. By setting the arc-shaped sidewall 53, the stability of the sample crucible in the furnace tube 3 is improved, reducing or avoiding tipping over when the sample crucible is pushed into the furnace tube 3, thus preventing the sample from spilling into the furnace tube 3. A notch is opened on the inner edge of the strip-shaped pot body 51; when the lid 52 is fastened, the edge of the lid 52 inserts into the notch. The wall thickness of the strip-shaped pot body 51 and the lid 52 is controlled at 10mm to 12mm, which is beneficial for the uniform heating of the sample in the sample crucible and improves the test results. In other embodiments, when the sample sintering requirements are not high, the sample crucible only has a strip-shaped pot body; no lid is provided.

[0031] In use, place the sample inside the strip-shaped pot 51, fasten the pot lid 52, remove the second plug 33, and place the sample crucible inside the tube 31; then install and seal the second plug 33. Fasten the furnace lid 2, with the sealing strip 6 embedded in the groove to seal the gap between the furnace tube 3 and the side wall of the chamber. Connect the air inlet pipe 35 to the corresponding air source and adjust the flow rate; then power on the heating element 4 to heat it.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The above description is only a preferred embodiment of this utility model. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A tube furnace, comprising a box-type furnace body, a furnace cover, a furnace tube, a heating element, and a sample crucible; one side of the furnace cover is hinged to the box-type furnace body, and when closed, the furnace cover and the box-type furnace body enclose a chamber; the heating element is disposed within the inner wall of the chamber for heating the chamber; the furnace tube is inserted through the chamber, with both ends protruding; the sample crucible is used to hold a sample and is pushed into the furnace tube; characterized in that, A sealing structure is provided between the furnace tube and the side wall of the chamber; the sealing structure includes a sealing strip and a groove formed on the side wall of the chamber; when the furnace cover and the box-type furnace body are fastened together, the sealing strip is embedded in the groove to seal the gap between the furnace tube and the side wall of the chamber.

2. The tubular furnace according to claim 1, characterized in that: An annular boss is provided on the furnace tube. The cross-section of the annular boss is trapezoidal. The position and shape of the annular boss are adapted to the position of the groove. When the furnace cover and the box-type furnace body are fastened together, the annular boss is inserted into the groove.

3. The tubular furnace according to claim 1 or 2, characterized in that: The heating element includes a plurality of heating rods, which are evenly spaced along the circumference of the furnace tube within the box-type furnace body and furnace cover; the plurality of heating rods are connected in parallel.

4. The tubular furnace according to claim 1, characterized in that: The furnace tube includes a tube body, a first plug, a second plug, and a temperature measuring probe. The first plug and the second plug are respectively sealed and embedded at both ends of the tube body. The temperature measuring probe is inserted through the first plug and is used to detect the temperature inside the tube body.

5. The tubular furnace according to claim 4, characterized in that: The furnace tube also includes an inlet pipe and an exhaust pipe. The inlet pipe is inserted into the second plug, and the exhaust pipe is inserted into the first plug. A valve is provided on the inlet pipe, and a one-way valve is provided on the exhaust pipe. The one-way valve allows flow from the pipe body outward and stops flow from the outside into the pipe body.

6. The tubular furnace according to claim 5, characterized in that: The sample crucible includes a strip-shaped pot body with arc-shaped sidewalls that are adapted to the inner sidewalls of the tube body.

7. The tubular furnace according to claim 6, characterized in that: The sample crucible also includes a lid, with a notch on the inner edge of the strip-shaped crucible body; when the lid is closed, the edge of the lid is inserted into the notch. The wall thickness of the strip-shaped crucible body and the lid is controlled between 10 mm and 12 mm.

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