Test furnace

Abstract

The present application relates to testing or analyzing materials by means of measuring the chemical or physical properties of the materials, and specifically to a test furnace, which includes a fixed table, a rotating table, an annular base, an upper furnace body and a sample support portion. The rotating table is rotatably arranged above the fixed table. The annular base is arranged on the rotating table to rotate with the rotating table. The upper furnace body is used to connect with the annular base to form a sealed furnace chamber. The sample support portion is used to support the test sample. The sample support portion is arranged on the radial inner side of the annular base and extends upward from the bottom of the annular base to the furnace chamber. The annular base can rotate relative to the sample support portion. A vacuum channel is formed inside the sample support portion, which is connected to the furnace chamber and is used to evacuate the furnace chamber. The test furnace of the embodiment of the present application not only ensures that the upper furnace body and the annular base can rotate relative to the test sample, but also does not adversely affect the sealing of the vacuum channel when the upper furnace body and the annular base rotate.

Description

Technical Field

[0001] This invention relates to testing or analyzing materials by determining their chemical or physical properties and particularly to a test furnace. Background Art

[0002] When conducting certain tests on materials, it is sometimes desired that the test furnace be able to rotate relative to the test sample. However, existing test furnaces are usually stationary and cannot meet the rotation requirement.

[0003] Furthermore, for test furnaces that require vacuuming, a vacuum port is typically provided on the furnace wall or lid, with the furnace chamber evacuated via a vacuum line connected to the port. However, when the test furnace is configured to rotate, placing the vacuum port on the furnace wall or lid can cause the vacuum line to interfere with the furnace body during rotation, thereby compromising the seal between the vacuum line and the port. Summary of the Invention

[0004] In response to the above technical problems, an embodiment of the present application provides a rotatable test furnace, which will not adversely affect the sealing of the vacuum interface when rotating.

[0005] The test furnace of the embodiment of the present application includes: a fixed table; a rotating table, which is rotatably arranged above the fixed table; an annular base, which is arranged on the rotating table to rotate with the rotating table; an upper furnace body, which is used to connect with the annular base to jointly form a sealed furnace chamber; and a sample support part, which is used to support the test sample, and the sample support part is arranged on the radial inner side of the annular base and extends upward from the annular base to the furnace chamber. The annular base can rotate relative to the sample support part, wherein a vacuum channel connected to the furnace chamber for vacuuming the furnace chamber is formed inside the sample support part.

[0006] The test furnace of the embodiment of the present application has the upper furnace body and the annular base configured to rotate relative to the sample support portion, and a vacuum channel connected to the furnace chamber is formed inside the sample support portion, thereby ensuring that the upper furnace body and the annular base can rotate relative to the test sample. At the same time, when the upper furnace body and the annular base rotate, the vacuum channel is relatively stationary, which will not have an adverse effect on the sealing of the vacuum channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Other objects and advantages of the present invention will become apparent from the following description of the present invention with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present invention.

[0008] Figure 1 is a schematic structural diagram of a test furnace according to one embodiment of the present invention;

[0009] Figure 2 yes Figure 1 A schematic cross-sectional view of the test furnace is shown;

[0010] Figure 3 yes Figure 2 An enlarged view of a part of the test furnace is shown;

[0011] Figure 4 is a schematic structural diagram of a test furnace according to another embodiment of the present invention, in which the upper furnace body is omitted;

[0012] Figure 5 yes Figure 4 a schematic cross-sectional view of the test furnace shown; and

[0013] Figure 6 yes Figure 5 An enlarged view of a portion of the test furnace is shown.

[0014] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

[0015] Description of reference numerals:

[0016] 100. Test furnace; 10. Upper furnace body; 101. Furnace cavity;

[0017] 11. Fixed platform;

[0018] 12. Rotating table;

[0019] 13. Annular base; 130. Annular base body; 131. Rotating shaft; 132. Bottom insulation ring; 133. Bushing;

[0020] 14. Sample support; 140. Vacuum channel; 141. Sample connection; 142. First tube; 1420. First through hole; 1421. Second through hole; 1422. Thick tube section; 1423. Thin tube section; 143. Second tube; 144. Vacuum chamber; 1441. Vacuum port; 145. Support;

[0021] 15. Shell; 151. Top wall; 152. Side wall; 1521. Inner cavity; 153. Sealing strip;

[0022] 160, top insulation body; 161, first insulation ring; 162, second insulation ring; 163, third insulation ring; 164, fourth insulation ring;

[0023] 171, upper heating section; 172, middle heating section; 173, lower heating section;

[0024] 18. Measuring window;

[0025] 21. First temperature measuring part; 22. Second temperature measuring part; 23. Third temperature measuring part;

[0026] 31. Support rod; 32. Slider;

[0027] 41. Screw shaft; 43. Furnace driving part;

[0028] 51. Rotation drive unit;

[0029] 81. Measuring sensor; 82. Sensor lifting mechanism;

[0030] 91. Sealing sleeve; 92. Sealing ring; 921. First sealing ring; 922. Second sealing ring;

[0031] 94. Top end cover;

[0032] 95. Bottom end cap;

[0033] 96. End plug;

[0034] 200. Test samples. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application should have the common meanings understood by persons having ordinary skills in the field to which the invention belongs.

[0037] In the description of the embodiments of the present invention, “a plurality of” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] See also Figures 1 to 4 The test furnace 100 of the embodiment of the present application includes: a fixed platform 11, a rotating platform 12, an annular base 13, an upper furnace body 10 and a sample support portion 14.

[0039] The fixed platform 11 can be arranged to be stationary. For example, the fixed platform 11 can be mounted at the bottom of the working panel. Alternatively, the fixed platform 11 can be the working panel. The rotating platform 12 is rotatably disposed above the fixed platform 11. In other words, the rotating platform 12 is disposed above the fixed platform 11 and can rotate relative to the fixed platform 11.

[0040] See also Figure 4, the annular base 13 is arranged on the rotating platform 12 to rotate with the rotating platform 12. Specifically, the annular base 13 is fixedly arranged on the rotating platform 12, and when the rotating platform 12 rotates, the annular base 13 is driven to rotate coaxially and synchronously.

[0041] The upper furnace body 10 is used to connect with the annular base 13 to form a sealed furnace chamber 101 .

[0042] The sample support 14 is used to support the test sample 200. It is located radially inward of the annular base 13 and extends upward from the bottom of the annular base 13 to the furnace chamber 101. The annular base 13 and the sample support 14 are rotatable relative to each other. A vacuum channel 140 is formed within the sample support 14, communicating with the furnace chamber 101 and used to evacuate the chamber 101.

[0043] The test furnace 100 of the embodiment of the present application has the upper furnace body 10 and the annular base 13 configured to rotate relative to the sample support portion 14, and a vacuum channel 140 connected to the furnace chamber 101 is formed inside the sample support portion 14, thereby ensuring that the upper furnace body 10 and the annular base 13 can rotate relative to the test sample 200. At the same time, when the upper furnace body 10 and the annular base 13 rotate, the vacuum channel 140 is relatively stationary and does not rotate with the upper furnace body 10 and the annular base 13, so as not to adversely affect the sealing of the vacuum channel 140.

[0044] In addition, the embodiment of the present application can reasonably utilize space by forming a vacuum channel 140 inside the sample support portion 14 .

[0045] The test sample 200 may be, for example, a radioactive sample. In some embodiments, the test sample 200 may be a cladding tube sample, and the test furnace 100 is used for internal pressure testing. In some embodiments, the test sample 200 may also be other samples.

[0046] The upper furnace body 10 can be mounted on the rotating platform 12 so as to rotate with the rotating platform 12. In some embodiments, the upper furnace body 10 is configured to move up and down relative to the annular base 13, thereby enabling it to connect with the annular base 13 to form a furnace chamber 101 for sealing the sample support 14 and the test sample 200. Specifically, by moving up and down relative to the annular base 13, the upper furnace body 10 can connect with the annular base 13 to form a furnace chamber 101 for sealing the sample support 14 and the test sample 200; or it can separate from the annular base 13 to expose the sample support 14 and the test sample 200 (i.e., open the furnace chamber 101).

[0047] In other embodiments, the upper furnace body 10 may not be disposed on the rotating platform 12 , but may be covered on the annular base 13 and rotate coaxially with the annular base 13 .

[0048] See also Figure 5 In some embodiments, the annular base 13 may include: an annular base body 130 and a hollow rotating shaft 131. The rotating shaft 131 is arranged on the radial inner side of the annular base body 130. The rotating shaft 131 extends downward through the rotating table 12 and the fixed table 11 in sequence to the bottom of the fixed table 11. The rotating shaft 131 is configured to be fixedly connected to the rotating table 12 and can rotate relative to the fixed table 11. The sample support part 14 extends upward inside the rotating shaft 131 to above the annular base 13. The rotating shaft 131 can rotate relative to the sample support part 14. A bushing 133 may be provided between the sample support part 14 and the upper end of the rotating shaft 131.

[0049] See also Figure 6 In some embodiments, the test furnace 100 may further include: a sealing sleeve 91 , a sealing ring 92 , and a vacuum chamber 144 .

[0050] The sealing sleeve 91 passes through the fixing platform 11 and is fixedly connected to the fixing platform 11. The rotating shaft 131 extends downward into the sealing sleeve 91, and the lower end of the rotating shaft 131 is located radially inward of the sealing sleeve 91.

[0051] The sealing ring 92 is disposed in the sealing sleeve 91 and is configured to abut against the rotating shaft 131 to form a dynamic seal.

[0052] The vacuum chamber 144 is located below the sealing sleeve 91 . The sample support portion 14 extends downwardly from the rotating shaft 131 and the sealing sleeve 91 , so that the vacuum channel 140 is in communication with the vacuum chamber 144 .

[0053] It is easy to understand that the vacuum chamber 144 is not connected to the sealing sleeve 91. The vacuum chamber 144 is connected to the furnace chamber 101 only through the vacuum channel 140, so that the furnace chamber 101 can be evacuated using a vacuum pump (not shown). The vacuum chamber 144 has a vacuum port 1441, which is connected to the vacuum pump via a vacuum pipeline (not shown).

[0054] Since the vacuum chamber 144, the vacuum port 1441, the vacuum channel 140 and the vacuum pipeline do not rotate with the upper furnace body 10 and the annular base 13, and the sealing sleeve 91 and the sealing ring 92 are used to form a dynamic seal on the rotating shaft 131, the sealing of the furnace chamber 101 is ensured.

[0055] The number of sealing rings 92 can be multiple. These sealing rings 92 can be lip-shaped. The upper plurality of first sealing rings 921 have upward-facing openings, while the lower plurality of second sealing rings 922 have downward-facing openings. The lowermost first sealing ring 921 is directly connected to the uppermost second sealing ring 922, with no other components separating them. In this embodiment, the dynamic seal between the sealing rings and the rotating shaft 131 prevents communication between the interior of the rotating shaft 131 and the external environment.

[0056] Since better sealing is required under high temperature and high vacuum conditions, the embodiment of the present application specifically sets the number of second sealing rings 922 with openings facing downward to be smaller than the number of first sealing rings 921 with openings facing upward. When the rotating shaft 131 rotates, the multiple lip-shaped sealing rings in the sealing sleeve 91 can ensure that the furnace chamber 101 does not leak under high temperature and vacuum environment.

[0057] In some embodiments, the first sealing ring 921 and the second sealing ring 922 are lip-shaped sealing rings with the same structure. The lip-shaped sealing rings can be made of rubber. For example, the lip-shaped sealing rings can be made of high-temperature resistant rubber.

[0058] In this embodiment, the test furnace 100 further includes an end plug 96 disposed radially inwardly of the sealing sleeve 91 for sealing the lower end of the sealing sleeve 91. The rotating shaft 131 is located above the end plug 96. The first tube 142 extends downwardly through the end plug 96 to the vacuum chamber 144.

[0059] In some embodiments, the test furnace 100 further includes a top end cover 94 disposed on the top of the sealing sleeve 91 , with a gap existing between the top end cover 94 and the rotating shaft 131 .

[0060] The test furnace 100 further includes a bottom end cap 95 disposed at the bottom of the sealing sleeve 91 and fixedly connected to the end plug 96. The top end cap 94 and the bottom end cap 95 may be flange structures. The lower portion of the bottom end cap 95 defines a vacuum chamber 144.

[0061] In some embodiments, a sealing ring may be provided between the top end cover 94 and the rotating shaft 131 .

[0062] In some embodiments, the sample support portion 14 includes a sample connecting portion 141 and a first tube 142. The sample connecting portion 141 is located in the furnace cavity 101 and is used to connect with the test sample 200.

[0063] The first tube 142 is connected to the sample connecting portion 141 . The sample connecting portion 141 is supported in the furnace chamber 101 by the first tube 142 .

[0064] The first tube 142 extends downward from the sample connection portion 141, communicates with the vacuum chamber 144 via the rotating shaft 131 and the sealing sleeve 91, and defines a vacuum channel 140. The section of the first tube 142 located within the furnace chamber 101 is provided with a first through-hole 1420, through which the vacuum channel 140 communicates with the furnace chamber 101.

[0065] There may be a plurality of first through holes 1420. The plurality of first through holes 1420 are evenly spaced and distributed around the circumference of the first tube body 142. For example, there may be two, four, five, or the like first through holes 1420.

[0066] In some embodiments, the portion of the first tube body 142 located within the rotating shaft 131 is further provided with a plurality of second through holes 1421 for evacuating the rotating shaft 131. It is easy to understand that in order to prevent the heat inside the furnace cavity 101 from being significantly dissipated to the rotating shaft 131, the gap between the rotating shaft 131 and the first tube body 142 is usually small. In this case, when the furnace cavity 101 is evacuated through the first through hole 1420, the vacuuming effect inside the rotating shaft 131 is usually not good. In particular, the embodiment of the present application also provides a plurality of second through holes 1421 in the portion of the first tube body 142 located within the rotating shaft 131, thereby improving the vacuuming effect on the rotating shaft 131, thereby improving the vacuuming effect on the furnace cavity 101.

[0067] In some embodiments, the test furnace 100 is an internal pressure furnace. In such embodiments, the test sample 200 may be a tubular sample. The sample connection portion 141 is a pressure connector for sealingly connecting with the test sample 200 to provide pressure medium to the interior of the test sample 200.

[0068] The sample connection part 141 may have a threaded interface, and a closed joint is installed at one end of the test sample 200, and a joint with an air channel is installed at the other end. The joint with the air channel of the test sample 200 may have a threaded interface, which can be sealed with the sample connection part 141 through the threaded interface.

[0069] The sample connection portion 141 is rigidly and sealedly connected to the test sample 200 to support the test sample 200 and provide pressure medium to the interior of the test sample 200 .

[0070] In such an embodiment, the sample supporting portion 14 further includes a second tube 143 disposed inside the first tube 142. The second tube 143 is connected to the sample connecting portion 141 and is used to supply pressure medium to the sample connecting portion 141.

[0071] The annular gap between the second tube body 143 and the first tube body 142 forms a vacuum channel 140. The second tube body 143 extends downward from the first tube body 142 into the vacuum chamber 144 and extends outward to connect to a pressure medium source.

[0072] In the test furnace 100 of the embodiment of the present application, when the upper furnace body 10 and the annular base 13 rotate, the vacuum channel 140 and the pressure supply pipeline (i.e., the second tube body 143) do not rotate with the upper furnace body 10 and the annular base 13, thereby not causing adverse effects on the sealing of the vacuum channel 140 and the pressure supply pipeline.

[0073] In addition, the embodiment of the present application can reasonably utilize space by forming a vacuum channel 140 inside the sample support portion 14 and providing a pressure supply pipeline.

[0074] The first tube body 142 may include a thick tube section 1422 at the top and a thin tube section 1423 at the bottom. The thick tube section 1422 is connected to the sample connection portion 141. The thin tube section 1423 is connected to the thick tube section 1422. The thin tube section 1423 may extend downward until it is connected to the vacuum chamber 144.

[0075] The inner diameter of the thick tube section 1422 is larger than that of the thin tube section 1423. The first through hole 1420 and the second through hole 1421 can be respectively provided in the section of the thick tube section 1422 located within the furnace chamber 101 and the section located within the rotating shaft 131. Thus, the thick tube section 1422 can be used to support the sample connection portion 141. Furthermore, the increased spacing between the first tube body 142 and the second tube body 143 also helps improve the vacuuming effect.

[0076] The test furnace 100 may further include a support portion 145 disposed between the rotating shaft 131 and the thin tube segment 1423, for axially supporting the thick tube segment 1422 and / or radially supporting the thin tube segment 1423. The support portion 145 is supported by the end plug 96, and the rotating shaft 131 is rotatable relative to the support portion 145. The provision of the support portion 145 ensures a non-contact and friction-free relationship between the thin tube segment 1423 and the rotating shaft 131, while also improving the stability of the sample support portion 14.

[0077] See also Figure 1 In some embodiments, a measuring window 18 is provided on the side wall of the upper furnace body 10 ; when the upper furnace body 10 and the annular base 13 are connected to form the furnace cavity 101 , the measuring window 18 faces the test sample 200 .

[0078] The test furnace 100 further includes a measuring sensor 81 configured to rotate along with the rotating platform 12 and disposed facing the measuring window 18 for measuring the contour data of the test sample 200 in the furnace cavity 101 .

[0079] In order to utilize the measuring sensor 81 to perform real-time measurement of the test sample 200 in the furnace cavity 101 during the internal pressure test, the embodiment of the present application is provided with a measuring window 18 on the side wall of the upper furnace body 10, so that the measuring sensor 81 can perform real-time measurement of the test sample 200 in the furnace cavity 101 through the measuring window 18. Since the embodiment of the present application is provided with the measuring window 18 on the side wall of the upper furnace body 10, there is a significant temperature difference in the temperature of the furnace cavity 101 along the circumferential direction. The embodiment of the present application provides a rotating table 12 so that the annular base 13 and the upper furnace body 10 can rotate relative to the sample support portion 14 and the test sample 200, which is beneficial to ensure that the circumferential temperature of the test sample 200 is uniform during the high-temperature internal pressure test, so as to prevent the accuracy of the measurement from being affected by the local temperature difference of the test sample 200.

[0080] Furthermore, since the test furnace 100 of the embodiment of the present application can perform real-time measurement of the test sample 200 in the furnace chamber 101 through the measuring window 18, it is possible to measure the actual state of the test sample 200 at different temperatures, different pressures, and different times; at the same time, since the measuring sensor 81 can rotate with the rotating table 12, that is, it can rotate around the test sample 200, the measuring sensor 81 can measure the dimensions of the test sample 200 in different circumferential directions, realize circumferential scanning of the test sample 200, and improve the authenticity and reliability of the measurement data.

[0081] It can be seen that the test furnace 100 of the embodiment of the present application realizes real-time and accurate measurement of the test sample 200 in the furnace chamber 101 during the internal pressure test by setting the measurement sensor 81, the measurement window 18 and the rotating table 12.

[0082] In some embodiments, the measurement sensor 81 may be fixedly mounted on the rotating table 12 or the upper furnace body 10 so as to rotate with the rotating table 12. In other words, the measurement sensor 81 remains at a constant height relative to the rotating table 12 or the upper furnace body 10 and rotates with the rotating table 12.

[0083] In some embodiments, when the test sample 200 is sealed with the sample connection portion 141, the test sample 200 extends vertically. The test furnace 100 further includes a sensor lifting mechanism 82 for driving the measurement sensor 81 up and down to measure the profile data of the test sample 200 at different heights within the furnace chamber 101. Thus, the test furnace 100 of the present application can further perform full-scale profile measurement of the test sample 200, including at any position in the axial and circumferential directions, further improving the authenticity and accuracy of the measured data.

[0084] The sensor lifting mechanism 82 can rotate along with the rotating stage 12 , thereby ensuring that the measuring sensor 81 remains facing the measuring window 18 .

[0085] In some embodiments, when the upper furnace body 10 is connected to the annular base 13 to jointly form the furnace cavity 101, the lower edge of the measurement window 18 is located above the sample connection portion 141 or is basically flush with the sample connection portion 141, and the upper edge of the measurement window 18 is located above the test sample 200 or at least flush with the upper end of the test sample 200, so that the measurement sensor 81 can measure the external contour data of the test sample 200 at any height position.

[0086] In some embodiments, the measuring window 18 is made of transparent glass. In some embodiments, the measuring sensor 81 may be a CCD.

[0087] In some embodiments, the measurement sensor 81 may be a laser ranging sensor. A laser ranging sensor includes a transmitter for emitting laser light and a receiver for receiving laser light. In this case, two measurement windows 18 are provided, positioned opposite each other. The transmitter and receiver are each positioned facing a measurement window 18 to measure the diameter of the test sample 200 using laser light. The measurement principles of a laser ranging sensor are well known to those skilled in the art and will not be elaborated upon here.

[0088] The sensor lifting mechanism 82 drives the transmitter and receiver of the laser ranging sensor to move up and down simultaneously, thereby ensuring that the receiver is set relative to the transmitter in real time to measure the shape profile data of the test sample 200 at different heights.

[0089] See also Figure 2 In some embodiments, the test furnace 100 further includes a rotation drive unit 51 disposed on the fixed platform 11 for driving the rotating platform 12 to rotate relative to the fixed platform 11. The rotation drive unit 51 may be a servo motor. In some embodiments, the rotating platform 12 can be controlled by the servo motor to rotate 360° forward and reverse to perform a circular scan of the test sample 200 within the furnace chamber 101.

[0090] In some embodiments, the test furnace 100 further includes a control unit (not shown) configured to control the rotation drive unit 51 to rotate the rotating table 12 by a first angle, and then control the sensor lifting mechanism 82 to move the measurement sensor 81 up and down. During the up and down movement of the measurement sensor 81, the measurement sensor 81 is controlled to collect contour data of the test sample 200. After the measurement sensor 81 collects contour data of the test sample 200 at the current angle, the control unit can further control the rotation drive unit 51 to rotate the rotating table 12 by a first angle, and then control the sensor lifting mechanism 82 to move the two measurement sensors 81 up and down, thereby controlling the measurement sensors 81 to collect contour data of the test sample 200 at another angle. This first angle can be selected based on test requirements. In a similar manner, the full-scale contour of the test sample 200 can be measured.

[0091] In some embodiments, the upper furnace body 10 includes: a shell 15, a lateral insulation ring and a heating part.

[0092] See also Figure 2 and Figure 3 The housing 15 includes a top wall 151 and side walls 152 extending downward from the periphery of the top wall 151. The top wall 151 and the side walls 152 together form a cavity with an opening at the bottom. Lateral insulation rings are disposed radially inward of the side walls 152. The radially inner surfaces of the lateral insulation rings define the side walls of the furnace cavity 101. A heating unit is disposed radially inward of the lateral insulation rings for heating the furnace cavity 101.

[0093] The measuring window 18 is provided on the side wall 152 of the housing 15 , and a recess is provided at a position of the lateral thermal insulation ring facing the measuring window 18 .

[0094] In some embodiments, the upper furnace body 10 further includes: a top insulation body 160 , which extends downward from the top wall 151 of the shell 15 to connect with the lateral insulation ring, and is used to increase the insulation performance of the top of the furnace cavity 101 .

[0095] Part of the lower end surface of the top insulation body 160 (such as the middle part of the lower end surface) defines the top wall of the furnace cavity 101, and another part of the lower end surface of the top insulation body 160 (such as the peripheral part of the lower end surface) is connected to the side insulation ring.

[0096] In some embodiments, the heating section includes, from top to bottom, an upper heating section 171, a middle heating section 172, and a lower heating section 173, which are independent of each other. When the upper furnace body 10 and the annular base 13 are connected to form the furnace cavity 101, the upper heating section 171 is located above the test sample 200 and is used to heat the position of the furnace cavity 101 above the test sample 200; the middle heating section 172 faces the test sample 200 and is used to heat the position of the furnace cavity 101 where the test sample 200 is located; and the lower heating section 173 faces the sample connection portion 141 and is used to heat the position of the furnace cavity 101 where the sample connection portion 141 is located.

[0097] The provision of the upper heating section 171 , the middle heating section 172 and the lower heating section 173 is conducive to ensuring uniform temperature of the entire test sample 200 , thereby improving the accuracy of the measurement result.

[0098] Each heating section may include a plurality of heating wires spaced apart along the circumferential direction. In some embodiments, the diameter of the heating wire of the middle heating section 172 may be greater than the diameter of the heating wire of the upper heating section 171 and the lower heating section 173.

[0099] The test furnace 100 further includes a first temperature measuring portion 21, a second temperature measuring portion 22, and a third temperature measuring portion 23. The first temperature measuring portion 21 extends downward from the top wall 151 of the shell 15 within the furnace chamber 101 to a position located in the middle of the upper heating section 171 and is used to measure the temperature above the test sample 200. The second temperature measuring portion 22 extends downward from the top wall 151 of the shell 15 within the furnace chamber 101 to a position located in the middle of the middle heating section 172 and is used to measure the temperature of the middle portion of the test sample 200. The third temperature measuring portion 23 extends downward from the top wall 151 of the shell 15 within the furnace chamber 101 to a position located in the lower heating section 173 and is used to measure the temperature at the sample connection portion 141.

[0100] It is easy to understand that the first temperature measuring part 21 , the second temperature measuring part 22 and the third temperature measuring part 23 all pass through the top heat-insulating body 160 and enter downward into the furnace cavity 101 .

[0101] The control unit is configured to: adjust the heating power of the upper heating section 171 according to the temperature detected by the first temperature measuring unit 21 and the first preset temperature; adjust the heating power of the middle heating section 172 according to the temperature detected by the second temperature measuring unit 22 and the second preset temperature; and adjust the heating power of the lower heating section 173 according to the temperature detected by the third temperature measuring unit 23 and the third preset temperature.

[0102] Specifically, when the temperature detected by the temperature measuring unit is lower than a preset temperature, the control unit controls to increase the heating power of the corresponding heating section so that the temperature detected by the temperature measuring unit is equal to the preset temperature. When the temperature detected by the temperature measuring unit is higher than the preset temperature, the control unit controls to reduce the heating power of the corresponding heating section so that the temperature detected by the temperature measuring unit is equal to the preset temperature.

[0103] In some embodiments, the first preset temperature, the second preset temperature, and the third preset temperature may be the same. In other embodiments, since hot air rises and cold air sinks, and the opening of the oven cavity 101 is located at the bottom, the third preset temperature may be set slightly higher than the first preset temperature and the second preset temperature.

[0104] In some embodiments, the lateral insulation rings include, from top to bottom, a first insulation ring 161, a second insulation ring 162, a third insulation ring 163, and a fourth insulation ring 164, which are connected in sequence. These four insulation rings are independent of each other, and adjacent insulation rings are assembled together. The connecting end surfaces of adjacent insulation rings are stepped, which can both enhance the insulation effect and reduce radiation if the test sample 200 is radioactive.

[0105] A clearance groove is formed in the second heat-retaining ring 162. The clearance groove faces the measuring window 18. The heating portion is arranged at a position in the circumferential direction of the second heat-retaining ring 162 to avoid the clearance groove.

[0106] In some embodiments, the upper heating section 171 is disposed on the first insulation ring 161 , the middle heating section 172 is disposed on the second insulation ring 162 , and the lower heating section 173 is disposed on the third insulation ring 163 .

[0107] When the upper furnace body 10 and the annular base 13 are connected to form the furnace cavity 101 together, the first insulation ring 161 is located above the test sample 200; the second insulation ring 162 faces the test sample 200; the third insulation ring 163 faces the sample connecting portion 141; and the fourth insulation ring 164 faces the first tube body 142.

[0108] In some embodiments, the inner diameter of the fourth insulation ring 164 is smaller than the inner diameters of the first insulation ring 161, the second insulation ring 162, and the third insulation ring 163. Thus, the volume of the furnace cavity 101 can be reduced, and the difference in temperature between the furnace cavity 101 at the first tube body 142 and the temperature of the furnace cavity 101 at the sample connection part 141 can be reduced.

[0109] In some embodiments, the annular base 13 includes a bottom insulation ring 132 disposed on the annular base body 130, and a rotation shaft 131 disposed radially inward of the bottom insulation ring 132. The lower end surface of the fourth insulation ring 164 conforms to the upper end surface of the bottom insulation ring 132. When the upper furnace body and the annular base 13 are connected to form the furnace cavity 101, the lower end surface of the fourth insulation ring 164 abuts the upper end surface of the bottom insulation ring 132.

[0110] In such an embodiment, due to the presence of the fourth insulation ring 164 and the bottom insulation ring 132, the position of the furnace chamber 101 where the first tube body 142 is located is insulated, which is conducive to keeping the pressure medium entering the first tube body 142 in a higher temperature range. When the pressure medium passes through the sample connection part 141, it can be quickly heated to the third preset temperature by the lower heating section 173, thereby reducing the temperature difference of the medium in the test sample 200, which is conducive to improving the accuracy of the test.

[0111] In some embodiments, the first insulation ring 161 , the second insulation ring 162 , the third insulation ring 163 , the fourth insulation ring 164 and the bottom insulation ring 132 may be vacuum-formed alumina fiber blocks.

[0112] In some embodiments, the upper end face of the bottom insulation ring 132 has a shape with a high middle portion and a low periphery. In the embodiment of the present application, since a lateral insulation ring is provided on the upper furnace body 10, and a bottom insulation ring 132 is provided on the annular base 13, and the upper end face of the bottom insulation ring 132 is provided with a shape with a high middle portion and a low periphery, and the lower end face of the lateral insulation ring is provided to match the upper end face of the bottom insulation ring 132 in a contoured manner, this is beneficial for making the first tube 142 more stable, and on the other hand, it extends the path for hot air to flow from the furnace cavity 101 through the gap between the lower end face of the lateral insulation ring and the upper end face of the bottom insulation ring 132 (i.e., the opening of the furnace cavity 101) to the external space, thereby greatly enhancing the insulation effect of the furnace cavity 101, facilitating the temperature uniformity in the axial direction of the furnace cavity 101, thereby ensuring the temperature uniformity of the test sample 200, and improving the measurement accuracy.

[0113] In addition, the enhanced thermal insulation performance is also beneficial for reducing the radial thickness of the lateral thermal insulation rings and the bottom thermal insulation ring 132 while ensuring the thermal insulation effect, thereby reducing the radial size of the test furnace 100 as a whole.

[0114] See also Figure 5 The annular base body 130 has an upwardly protruding periphery to form an annular rib. The bottom insulation ring 132 is mounted on the annular base body 130 and located radially inward of the annular rib. When the upper furnace body 10 and the annular base 13 are joined to form the furnace chamber 101, the sidewall 152 of the housing 15 seals against the annular rib of the annular base body 130.

[0115] See also Figure 3 In some embodiments, a sealing strip 153 may be provided at the lower end of the side wall 152 of the housing 15 for sealing with the annular rib. In some embodiments, a sealing strip may also be provided on the annular rib to further strengthen the sealing of the oven cavity 101.

[0116] In some embodiments, a lumen 1521 is formed within the sidewall 152 of the housing 15 for allowing a cooling medium to flow, thereby reducing the temperature of the housing 15. The sidewall 152 is also provided with an inlet and an outlet communicating with the lumen 1521, respectively for allowing the cooling medium to flow into and out of the lumen 1521. The cooling medium may be water or gas, for example.

[0117] In some embodiments, the test furnace 100 may be a lifting furnace. Figure 1 and Figure 2 The test furnace 100 further includes: a plurality of support rods 31 and a driving mechanism.

[0118] A plurality of support rods 31 extend vertically upward from the rotating platform 12. The upper furnace body 10 is slidably disposed on the plurality of support rods 31 via sliders 32 in a vertical direction. The driving mechanism is used to drive the upper furnace body 10 to move vertically relative to the annular base 13.

[0119] The drive mechanism may include a furnace body drive unit 43 and a transmission assembly. The furnace body drive unit 43 may be a servo motor. The transmission assembly may include a screw shaft 41 and a ball nut. The ball nut is connected to the upper furnace body 10 and is configured to move axially along the screw shaft 41 when the screw shaft 41 rotates, thereby driving the upper furnace body 10 upward or downward. It is easy to understand that the screw shaft 41 and the ball nut together constitute the ball screw.

[0120] In other embodiments, the upper furnace body 10 can be moved up and down relative to the annular base 13 by other lifting mechanisms.

[0121] Regarding the embodiments of the present invention, it should also be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0122] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A test furnace, characterized in that: include: Fixed table; A rotating platform is rotatably arranged above the fixed platform; An annular base is provided on the rotating platform to rotate along with the rotating platform; an upper furnace body, configured to connect with the annular base to form a sealed furnace cavity; as well as The sample support portion is used to support the test sample. The sample support portion is arranged on the radial inner side of the annular base and extends upward from the bottom of the annular base to the furnace cavity. The annular base can rotate relative to the sample support portion. Wherein, a vacuum channel is formed inside the sample support portion and is communicated with the furnace cavity and is used to vacuum the furnace cavity.

2. The test furnace according to claim 1, characterized in that The annular base comprises: an annular base body; and A hollow rotating shaft is provided on the radial inner side of the annular base body, and the rotating shaft extends downward through the rotating platform and the fixed platform in sequence to the bottom of the fixed platform. The rotating shaft is fixedly connected to the rotating platform and can rotate relative to the fixed platform. The sample supporting portion extends upward inside the rotating shaft to above the annular base, and the rotating shaft and the sample supporting portion can rotate relative to each other.

3. The test furnace according to claim 2, characterized in that Also includes: a sealing sleeve, the sealing sleeve being fixedly connected to the fixing platform, the lower end of the rotating shaft being located radially inward of the sealing sleeve; a sealing ring disposed in the sealing sleeve and configured to abut against the rotating shaft to form a dynamic seal; as well as The vacuum chamber is located below the sealing sleeve, and the sample support portion extends downward from the rotating shaft and the sealing sleeve so that the vacuum channel is connected to the vacuum chamber.

4. The test furnace according to claim 3, characterized in that The sample support portion comprises: a sample connecting portion, configured to connect to a test sample, the sample connecting portion being located in the furnace cavity; and A first tube body is connected to the sample connection portion, and the first tube body extends downward from the sample connection portion and communicates with the vacuum chamber via the rotating shaft and the sealing sleeve, and the first tube body defines the vacuum channel. A first through hole is provided in the tube section of the first tube body located in the furnace cavity, and the vacuum channel is communicated with the furnace cavity through the first through hole.

5. The test furnace according to claim 4, characterized in that The tube section of the first tube body located inside the rotating shaft is provided with a second through hole for vacuuming the rotating shaft.

6. The test furnace according to claim 5, characterized in that The sample support portion further comprises: The second tube body is disposed inside the first tube body and connected to the sample connection portion, and is used to supply pressure medium to the sample connection portion. The annular gap between the second tube body and the first tube body forms the vacuum channel. The second tube body extends downward from the sample connecting portion into the vacuum chamber and extends outward to be connected to a pressure medium source.

7. The test furnace according to claim 6, characterized in that The first tube body includes: a thick tube section connected to the sample connection portion; and The thin tube section is connected to the thick tube section, The inner diameter of the thick tube section is greater than the inner diameter of the thin tube section, and the first through hole and the second through hole are respectively provided in the tube section of the thick tube section located in the furnace cavity and the tube section located in the rotating shaft.

8. The test furnace according to claim 1, characterized in that A measuring window is provided on the side wall of the upper furnace body, and when the upper furnace body and the annular base are connected to form the furnace cavity, the measuring window faces the test sample; The test furnace further includes a measuring sensor configured to rotate along with the rotating platform and disposed facing the measuring window, for measuring the contour data of the test sample in the furnace cavity.

9. The test furnace according to claim 8, characterized in that Also includes: The sensor lifting mechanism is configured to rotate along with the rotating platform and is used to drive the measuring sensor to move up and down, thereby measuring the contour data of the test sample at different heights in the furnace chamber.

10. The test furnace according to claim 8, characterized in that The upper furnace body comprises: a housing with an opening at the bottom; a heat-insulating layer disposed in the shell; and The heating part is arranged on the radial inner side of the thermal insulation layer and is used to heat the furnace cavity. The measuring window is arranged on the side wall of the shell, and a recess is provided at a position of the thermal insulation layer facing the measuring window.

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