High temperature furnace for internal pressure testing

Abstract

The present application relates to testing or analyzing materials by determining their chemical or physical properties. Specifically, it relates to a high-temperature furnace for internal pressure testing, comprising a base, a pressure medium supply unit, and an upper furnace body. The upper furnace body is connected to the base to form a sealed furnace chamber. The pressure medium supply unit includes a pressure supply line and a pressure connector. The pressure connector is used to supply pressure medium to the interior of the test sample. The pressure supply line extends upward from the base into the furnace chamber. The upper furnace body includes a shell, lateral insulation rings, and a heating unit. The shell includes a top wall and side walls extending downward from the periphery of the top wall. The lateral insulation rings are disposed radially inward of the side walls. The heating unit is disposed radially inward of the lateral insulation rings for heating the furnace chamber. The base includes a bottom insulation ring, and the pressure supply line extends radially inward of the bottom insulation ring into the furnace chamber. The upper end surface of the bottom insulation ring has a high center portion and a low periphery. The lower end surface of the lateral insulation rings conforms to the upper end surface of the bottom insulation ring.

Description

Technical Field

[0001] The present invention relates to testing or analyzing materials by measuring their chemical or physical properties, and in particular to a high-temperature furnace for internal pressure testing. Background Art

[0002] Due to the unique nature of their application, reactor fuel cladding tubes require internal pressure testing to measure their mechanical properties both before and after irradiation. Prior to this testing, high-temperature furnaces used for internal pressure testing of cladding tubes suffered from uneven internal temperatures and poor insulation, reducing the accuracy of test sample measurements. Summary of the Invention

[0003] In response to the above technical problems, an embodiment of the present application provides a high-temperature furnace for internal pressure testing, which is used to improve the measurement accuracy of the internal pressure test.

[0004] The high-temperature furnace provided in the embodiment of the present application includes:

[0005] base;

[0006] an upper furnace body, configured to connect with the base to form a sealed furnace cavity; and

[0007] A pressure medium supply portion, comprising a pressure supply pipeline and a pressure joint connected to the pressure supply pipeline, wherein the pressure supply pipeline extends upward from the base to the furnace chamber, and the pressure joint is used to be sealedly connected to the test sample to provide pressure medium to the interior of the test sample;

[0008] Among them, the upper furnace body includes:

[0009] The shell includes a top wall and side walls extending downward from the periphery of the top wall;

[0010] a lateral heat-insulating ring, disposed radially inwardly of the side wall, wherein the radially inner surface of the lateral heat-insulating ring defines the side wall of the furnace cavity; and

[0011] The heating part is arranged on the radial inner side of the lateral heat preservation ring and is used for heating the furnace cavity;

[0012] The base includes a bottom insulation ring, and the pressure supply pipeline extends upward from the radial inner side of the bottom insulation ring to the furnace cavity;

[0013] The upper end face of the bottom insulation ring has a shape with a high middle part and a low periphery, and the lower end face of the side insulation ring is matched with the upper end face of the bottom insulation ring. When the upper furnace body and the base are connected to form a furnace cavity together, the lower end face of the side insulation ring is fitted with the upper end face of the bottom insulation ring.

[0014] In the embodiment of the present application, a lateral thermal insulation ring is provided on the upper furnace body, a bottom thermal insulation ring is provided on the base, and the upper end face of the bottom thermal insulation ring is provided to have a high middle portion and a low periphery, and the lower end face of the lateral thermal insulation ring is provided to match the upper end face of the bottom thermal insulation ring. On the one hand, this is conducive to making the pressure supply pipeline more stable, and on the other hand, it extends the path of hot gas flowing from the furnace cavity through the gap between the lower end face of the lateral thermal insulation ring and the upper end face of the bottom thermal insulation ring (that is, the opening of the furnace cavity) to the external space, thereby greatly enhancing the thermal insulation effect of the furnace cavity, being conducive to achieving uniform temperature inside the furnace cavity, thereby ensuring uniform temperature of the test sample, and being conducive to improving measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 is a structural schematic diagram of a high-temperature furnace according to one embodiment of the present invention;

[0017] Figure 2 yes Figure 1 A schematic cross-sectional view of a high-temperature furnace is shown;

[0018] Figure 3 yes Figure 2 A partial enlarged view of the high temperature furnace is shown;

[0019] Figure 4 is a projection contour line of the upper end surface of the bottom insulation ring according to one embodiment of the present invention on a vertical plane;

[0020] Figure 5 is a structural schematic diagram of a high-temperature furnace according to another embodiment of the present invention;

[0021] Figure 6 yes Figure 5 The diagram shows a partial structure of a high-temperature furnace, with the upper furnace body omitted;

[0022] Figure 7 yes Figure 6 A schematic cross-sectional view of a high-temperature furnace is shown;

[0023] Figure 8 is a schematic structural diagram of a second insulation ring according to an embodiment of the present invention; and

[0024] Figure 9 FIG. 1 is a schematic structural diagram of a heat dissipation cover according to an embodiment of the present invention.

[0025] 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.

[0026] Description of reference numerals:

[0027] 100. High-temperature furnace; 101. Furnace cavity;

[0028] 11. Fixed platform; 12. Rotating platform; 13. Base; 130. Base body; 131. Rotating shaft; 132. Bottom insulation ring; 1321. First horizontal section; 1322. Second horizontal section; 1323. First inclined section; 1324. Vertical section; 1325. Second inclined section; 133. Bushing;

[0029] 141, pressure connector; 142, pressure supply pipeline; 143, vacuum pipeline; 1430, through hole; 1431, upper vacuum pipeline; 1432, lower vacuum pipeline;

[0030] 144, vacuum chamber; 1441, vacuum port;

[0031] 15. Shell; 151. Top wall; 152. Side wall; 1521. Inner cavity; 153. Sealing strip;

[0032] 160, top insulation body; 161, first insulation ring; 162, second insulation ring; 1621, annular body; 1622, step surface; 1623, clearance groove; 163, third insulation ring; 164, fourth insulation ring;

[0033] 171, upper heating section; 172, middle heating section; 173, lower heating section;

[0034] 18. Peep window; 19. Heat dissipation cover; 191. Heat dissipation fins; 192. Make way opening;

[0035] 21. First temperature measuring part; 22. Second temperature measuring part; 23. Third temperature measuring part;

[0036] 31. Support rod; 33. Slider;

[0037] 41. Screw shaft; 42. Ball nut; 43. Vertical drive unit;

[0038] 51. Rotation drive unit;

[0039] 91. Sealing sleeve; 92. Sealing ring;

[0040] 200. Test samples. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] The present application provides a high temperature furnace for internal pressure testing. Figures 1 to 3 The high temperature furnace 100 of the embodiment of the present application includes: a base 13, a pressure medium supply part and an upper furnace body.

[0045] The upper furnace body is connected to the base 13 to form a sealed furnace chamber 101. The pressure medium supply unit includes a pressure supply line 142 and a pressure connector 141 connected to the pressure supply line 142. The pressure supply line 142 is mounted on the base 13. Specifically, the pressure supply line 142 extends upward from the base 13 to the furnace chamber 101 above the base 13.

[0046] The pressure connector 141 is used to sealably connect with the test sample 200, thereby providing pressure medium to the interior of the test sample 200. The pressure connector 141 may have a threaded interface. One end of the test sample 200 is closed, and the other end is equipped with a connector with an air passage. This connector has a threaded interface, and the connector of the test sample 200 and the pressure connector 141 can be sealed via the threaded interface. As will be readily understood, the pressure connector 141 can support the test sample 200.

[0047] The test sample 200 may be, for example, a cladding tube sample. The cladding tube sample may be radioactive.

[0048] In some embodiments, the upper furnace body is configured to move up and down relative to the base 13, thereby connecting with the base 13 to jointly form a furnace chamber 101 for sealing the pressure joint 141 and the test sample 200; or separating from the base 13 to expose the pressure joint 141 and the test sample 200.

[0049] In some embodiments, the high-temperature furnace 100 can be a lifting furnace. The high-temperature furnace 100 also includes a plurality of support rods 31 and a drive mechanism. The upper furnace body is vertically slidably mounted on the support rods 31 via sliders 33. The drive mechanism is configured to drive the upper furnace body to move vertically relative to the base 13.

[0050] The drive mechanism may include a vertical drive unit 43 and a transmission assembly. The vertical drive unit 43 may be a servo motor. The transmission assembly may include a screw shaft 41 and a ball nut 42. The ball nut 42 is connected to the upper furnace body and is configured to move axially along the screw shaft 41 when the screw shaft 41 rotates, thereby driving the upper furnace body up or down. It is easy to understand that the screw shaft 41 and the ball nut 42 together constitute the ball screw.

[0051] In other embodiments, the upper furnace body can be moved up and down relative to the base 13 by other lifting mechanisms.

[0052] In some embodiments, the upper furnace body includes: a shell 15, a lateral insulation ring and a heating part.

[0053] 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 to heat the furnace cavity 101.

[0054] The base 13 includes a bottom insulation ring 132 . The pressure supply line 142 extends radially inwardly from the bottom insulation ring 132 upwardly to the furnace chamber 101 .

[0055] The upper end surface of the bottom insulation ring 132 has a shape with a high middle part and a low periphery, and the lower end surface of the side insulation ring is matched with the upper end surface of the bottom insulation ring 132. When the upper furnace body and the base 13 are connected to form the furnace cavity 101 together, the lower end surface of the side insulation ring is fitted with the upper end surface of the bottom insulation ring 132.

[0056] In the embodiment of the present application, a lateral insulation ring is provided on the upper furnace body, a bottom insulation ring 132 is provided on the base 13, and the upper end face of the bottom insulation ring 132 is provided to have 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. On the one hand, it is beneficial to make the pressure supply pipeline 142 more stable, and on the other hand, it extends the path of hot air flowing 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, and being beneficial to achieving uniform temperature inside the furnace cavity 101, thereby ensuring uniform temperature of the test sample 200, and being beneficial to improving measurement accuracy.

[0057] 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 high-temperature furnace 100 as a whole.

[0058] See also Figure 4 In some embodiments, the vertical projection of the upper end surface of the bottom insulation ring 132 includes, radially inward from the outside, a first horizontal section 1321, a transition section, and a second horizontal section 1322. The second horizontal section 1322 is higher than the first horizontal section 1321. This arrangement lengthens the path for hot air flowing from the opening of the furnace chamber 101 to the outside. Furthermore, because the hot air needs to change direction twice when flowing outward, the flow velocity of the hot air is reduced, thereby improving the thermal insulation effect of the furnace chamber 101.

[0059] In some embodiments, the transition section may be a straight line section or a curved line section extending obliquely upward from the first horizontal section 1321 to the second horizontal section 1322 .

[0060] In other embodiments, the transition segment includes multiple line segments that are not on the same straight line. Figure 4 The transition section includes a first inclined section 1323 extending obliquely upward from the first horizontal section 1321, a vertical section 1324 extending vertically upward from the first inclined section 1323, and a second inclined section 1325 extending obliquely upward from the vertical section 1324. This arrangement further extends the path for hot air to flow from the opening of the furnace chamber 101 to the outside space, while also allowing the hot air flow direction to be changed multiple times, thereby reducing the hot air flow velocity and improving the heat preservation effect of the furnace chamber 101.

[0061] See also Figure 7 The base 13 further includes a base body 130. The periphery of the base body 130 protrudes upward to form an annular rib. A bottom insulation ring 132 is mounted on the base body 130 and located radially inward of the annular rib. When the upper furnace body and the base 13 are connected to form the furnace chamber 101, the sidewall 152 of the housing 15 seals against the annular rib of the base body 130.

[0062] 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.

[0063] In some embodiments, the housing 15 can be made of stainless steel. In some embodiments, a heat dissipation cover 19 is provided on the radially outer side of the side wall 152 of the housing 15. Figure 9The heat dissipation cover 19 is provided with a plurality of heat dissipation fins 191 extending vertically. The upper surface of the top wall 151 of the housing 15 is provided with a plurality of concentric annular grooves for dissipating heat from the housing 15 .

[0064] In some embodiments, the sidewall 152 of the housing 15 defines an inner cavity 1521 for allowing a cooling medium to flow through, thereby reducing the temperature of the housing 15. The sidewall 152 also defines an inlet and an outlet communicating with the inner cavity 1521, respectively allowing the cooling medium to flow into and out of the inner cavity 1521. The cooling medium may be water or gas, for example.

[0065] In some embodiments, the upper furnace body may further include a top insulation member 160 extending downward from the top wall 151 to connect with the lateral insulation rings, thereby enhancing the thermal insulation performance of the cavity top. A portion of the lower end surface of the top insulation member 160 (e.g., the middle portion of the lower end surface) defines the top wall of the furnace cavity 101, while another portion of the lower end surface of the top insulation member 160 (e.g., the peripheral portion of the lower end surface) connects with the lateral insulation rings.

[0066] 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 and the 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 pressure joint 141 and is used to heat the position of the furnace cavity 101 where the pressure joint 141 is located.

[0067] 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.

[0068] The high-temperature furnace also includes a first temperature measuring portion 21, a second temperature measuring portion 22, a third temperature measuring portion 23, and a temperature control portion. The first temperature measuring portion 21 extends downward from the top wall 151 of the housing 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 housing 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 housing 15 within the furnace chamber 101 to a position located in the lower heating section 173 and is used to measure the temperature of the pressure joint 141.

[0069] 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 .

[0070] The temperature control part is configured to: adjust the heating power of the upper heating section 171 according to the temperature detected by the first temperature measuring part 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 part 22 and the second preset temperature; adjust the heating power of the lower heating section 173 according to the temperature detected by the third temperature measuring part 23 and the third preset temperature.

[0071] Specifically, when the temperature detected by the temperature measuring unit is lower than a preset temperature, the heating power of the corresponding heating section is increased to make the temperature detected by the temperature measuring unit equal to the preset temperature. When the temperature detected by the temperature measuring unit is higher than the preset temperature, the heating power of the corresponding heating section is reduced to make the temperature detected by the temperature measuring unit equal to the preset temperature.

[0072] 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.

[0073] Each heating section may include a plurality of heating rods or heating wire groups arranged at intervals along the circumferential direction.

[0074] 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.

[0075] Specifically, see Figure 8 The structure of the second heat preservation ring 162 is briefly described below, taking the second heat preservation ring 162 as an example. The second heat preservation ring 162 includes an annular body 1621 , and the upper and lower end surfaces of the annular body 1621 are both formed with step surfaces 1622 .

[0076] The lower end surface of the fourth insulation ring 164 is matched with the upper end surface of the bottom insulation ring 132. When the upper furnace body and the base 13 are connected to form the furnace cavity 101, the lower end surface of the fourth insulation ring 164 is in contact with the upper end surface of the bottom insulation ring 132.

[0077] In some embodiments, the first thermal insulation ring 161 , the second thermal insulation ring 162 , the third thermal insulation ring 163 and the fourth thermal insulation ring 164 may be vacuum-formed alumina fiber blocks.

[0078] 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 .

[0079] When the upper furnace body and the base 13 are connected to form the furnace chamber 101, 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 pressure joint 141; and the fourth insulation ring 164 faces the pressure supply line 142. In such an embodiment, a fourth insulation ring 164 and a bottom insulation ring 132 are further provided below the test sample 200 to insulate the position of the furnace chamber 101 where the pressure supply line 142 is located, thereby facilitating the pressure medium entering the pressure supply line 142 to be within a higher temperature range. Furthermore, when the pressure medium passes through the pressure joint 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 and improving the accuracy of the test.

[0080] 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 pressure supply line 142 and the temperature of the furnace cavity 101 at the pressure joint 141 can be reduced.

[0081] In some embodiments, the radial outer surfaces of the second insulation ring 162, the third insulation ring 163 and the fourth insulation ring 164 are provided with a high-temperature resistant thermal insulation coating. The high-temperature resistant thermal insulation coating is used to prevent the heat in the furnace cavity 101 from dissipating to the side wall 152 of the shell 15 outside the insulation ring. The inner surface of the side wall 152 can be in contact with the high-temperature resistant thermal insulation coating. The thickness of the high-temperature resistant thermal insulation coating can be selected to be within 10nm, for example. The embodiment of the present application can reduce the temperature of the outer surface of the shell 15 to below 60°C by designing the end face shape of the lateral insulation ring and the bottom insulation ring 132, arranging a high-temperature resistant thermal insulation coating on the radial outer side of the insulation ring, and arranging the side wall 152 to have an inner cavity 1521.

[0082] In some embodiments, the side wall 152 is provided with a peep window 18 for observing the test sample 200 in the furnace cavity 101. A clearance groove is provided at the position of the lateral insulation ring facing the peep window 18. Since the second insulation ring 162 faces the test sample 200, a clearance groove 1623 can be provided on the second insulation ring 162. The clearance groove 1623 is formed on the annular body 1621. The clearance groove 1623 faces the peep window 18 in the positive direction. The heating rod or heating wire group of the middle heating section 172 avoids the clearance groove 1623 at the position of the circumferential arrangement of the second insulation ring 162. In an embodiment with a heat dissipation cover 19, a clearance opening 192 is also provided on the heat dissipation cover 19.

[0083] The number of the peep windows 18 can be one or two. When the number of the peep windows 18 is two, the two peep windows 18 are arranged opposite to each other.

[0084] In the embodiment with the peep window 18, the clearance groove 1623 provided on the second insulation ring 162 reduces the insulation effect of the furnace cavity 101, resulting in the temperature of the position adjacent to the clearance groove 1623 in the furnace cavity 101 being lower than the temperature at other positions. Therefore, the embodiment of the present application also specifically configures the upper furnace body and the base 13 to be rotatable relative to the test sample 200 to ensure uniform temperature around the test sample 200.

[0085] See also Figures 1 to 3 The high-temperature furnace 100 of the embodiment of the present application may further include: a fixed platform 11 and a rotating platform 12. The fixed platform 11 may be arranged to be stationary. For example, the fixed platform 11 may be mounted on the bottom of the working panel. The rotating platform 12 may be rotatably arranged above the fixed platform 11. In other words, the rotating platform 12 is arranged above the fixed platform 11 and is rotatable relative to the fixed platform 11.

[0086] See also Figures 5 to 7 The base 13 is mounted on the rotating platform 12 to rotate with it. The base 13 is fixedly mounted on the rotating platform 12. When the rotating platform 12 rotates, the base 13 is driven to rotate synchronously along the same axis. The base 13 and the upper furnace body are both mounted on the rotating platform 12 to rotate with it. The base 13 can rotate relative to the pressure supply line 142.

[0087] It is easy to understand that when the base 13 rotates with the rotating platform 12 , the upper furnace body and the base 13 rotate synchronously coaxially.

[0088] In the embodiment of the present application, a rotating table 12 is provided to enable the base 13 and the upper furnace body to rotate relative to the pressure medium providing part, so that when conducting an internal pressure test, the heating part can rotate around the test sample 200, so that the temperature of the test sample 200 is ensured to be uniform during the high-temperature internal pressure test, so as to prevent the local temperature difference of the test sample 200 from affecting the accuracy of the measurement.

[0089] See also Figure 7 A hollow rotating shaft 131 is provided on the radially inner side of the bottom insulation ring 132. The rotating shaft 131 extends downward through the rotating table 12 and the fixed table 11 in sequence to 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 pressure supply pipeline 142 extends upward inside the rotating shaft 131 to the furnace chamber 101 above the base 13. The rotating shaft 131 can rotate relative to the pressure supply pipeline 142. A bushing 133 can be provided between the pressure supply pipeline 142 and the upper end of the rotating shaft 131.

[0090] The high temperature furnace 100 further includes a rotation driving unit 51 disposed on the fixed platform 11 for driving the rotating platform 12 to rotate relative to the fixed platform 11. A plurality of support rods 31 extend vertically upward from the rotating platform 12.

[0091] In some embodiments, the high-temperature furnace 100 of the present invention may further include a vacuum pumping line 143 extending from the radially inner side of the rotating shaft 131 to the furnace chamber 101. The rotating shaft 131 is rotatable relative to the vacuum pumping line 143. A bushing 133 is disposed between the pressure supply line 142 and the upper end of the rotating shaft 131.

[0092] The pressure supply line 142 is located radially inward of the vacuum pumping line 143. The section of the vacuum pumping line 143 located within the furnace chamber 101 is provided with at least one through-hole 1430, through which the vacuum pumping line 143 communicates with the furnace chamber 101. By disposing the vacuum pumping line 143 between the pressure supply line 142 and the rotating shaft 131, this embodiment of the present application not only rationally utilizes space but also protects the pressure supply line 142 with the vacuum pumping line 143.

[0093] There may be a plurality of through holes 1430 , which are evenly spaced and distributed around the circumference of the vacuum line 143 . For example, there may be two, four, five, or the like through holes 1430 .

[0094] In some embodiments, the vacuum line 143 includes an upper vacuum line 1431 located at the top and a lower vacuum line 1432 located at the bottom. The inner diameter of the upper vacuum line 1431 is larger than that of the lower vacuum line 1432. This allows the upper vacuum line 1431 to support the pressure connector 141. This also increases the distance between the vacuum line 143 and the pressure supply line 142, thereby improving the vacuuming effect. A through hole 1430 may be provided in the upper vacuum line 1431.

[0095] The inner diameter of the lower vacuum pumping pipeline 1432 is larger than the outer diameter of the pressure supply pipeline 142 so that there is a gap between the two, so that when vacuuming, the air in the furnace chamber 101 can flow out through the gap.

[0096] The lower section of the upper vacuum pipeline 1431 is located inside the rotating shaft 131 . The section of the upper vacuum pipeline 1431 located inside the rotating shaft 131 may also be provided with at least one through hole 1430 , thereby facilitating vacuuming the interior of the rotating shaft 131 .

[0097] In some embodiments, the high temperature furnace 100 of the embodiment of the present application may further include: a sealing sleeve 91 , a sealing ring 92 , and a vacuum chamber 144 .

[0098] 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.

[0099] The sealing ring 92 is disposed within the sealing sleeve 91 and is configured to abut against the rotating shaft 131, thereby forming a dynamic seal. There may be multiple sealing rings 92. These sealing rings 92 may be lip-shaped. The upper plurality of sealing rings 92 have their openings facing upward, while the lower plurality of sealing rings 92 have their openings facing downward.

[0100] Since better sealing is required under high temperature and high vacuum conditions, the embodiment of the present application specifically sets the number of sealing rings 92 with openings facing downward to be smaller than the number of sealing rings 92 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 conditions. The vacuum chamber 144 is located below the sealing sleeve 91. The vacuum pumping line 143 extends downward from the rotating shaft 131 and the sealing sleeve 91 and is connected to the vacuum chamber 144. It is easy to understand that the vacuum chamber 144 is not connected to the sealing sleeve 91. The vacuum chamber 144 is only connected to the furnace chamber 101 through the vacuum pumping line 143, so that the furnace chamber 101 is evacuated using a vacuum pump. The vacuum chamber 144 has a vacuum pumping port 1441, which is connected to the vacuum pump through a pipeline.

[0101] The pressure supply line 142 enters the vacuum chamber 144 from the vacuum pumping line 143 and extends outward. After exiting the vacuum chamber 144, the pressure supply line 142 can be connected to a high-pressure medium source through a pipeline to provide high-pressure medium from the high-pressure medium source.

[0102] In some embodiments, the high-pressure medium source is a high-pressure argon gas source. In some embodiments, after exiting the vacuum chamber 144, the pressure supply line 142 can be connected to the high-pressure argon gas source and the vacuum pump, respectively, via a T-joint. This allows the test sample 200 to be evacuated using the vacuum pump before the pressure medium is supplied to the test sample 200. Argon gas is then supplied to the test sample 200 using the high-pressure argon gas source. This vacuuming and argon gas supplying process is repeated multiple times to remove air from the test sample 200. The high-pressure argon gas source is then used to supply the pressure medium to the test sample 200 for internal pressure testing.

[0103] 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.

[0104] 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 high temperature furnace for internal pressure testing, characterized in that: include: Base (13); An upper furnace body, used to connect with the base (13) to form a sealed furnace chamber (101); as well as a pressure medium supply portion, comprising a pressure supply pipeline (142) and a pressure joint (141) connected to the pressure supply pipeline (142), wherein the pressure supply pipeline (142) extends upward from the base (13) to the furnace chamber (101), and the pressure joint (141) is used to be sealedly connected to the test sample (200) to provide pressure medium to the interior of the test sample (200); Wherein, the upper furnace body comprises: A housing (15), the housing (15) comprising a top wall (151) and a side wall (152) extending downward from a periphery of the top wall (151); a lateral heat-insulating ring, arranged on the radial inner side of the side wall (152), wherein the radial inner surface of the lateral heat-insulating ring defines and forms the side wall of the furnace cavity (101); and A heating portion, arranged on the radial inner side of the lateral heat-insulating ring, for heating the furnace cavity (101); The base (13) includes a bottom insulation ring (132), and the pressure supply pipeline (142) extends upward from the radial inner side of the bottom insulation ring (132) to the furnace cavity (101); The upper end surface of the bottom heat-insulating ring (132) has a shape with a high middle portion and a low periphery, and the lower end surface of the lateral heat-insulating ring is matched with the upper end surface of the bottom heat-insulating ring (132). When the upper furnace body and the base (13) are connected to form the furnace cavity (101), the lower end surface of the lateral heat-insulating ring is in contact with the upper end surface of the bottom heat-insulating ring (132).

2. The high temperature furnace according to claim 1, characterized in that The projection contour line of the upper end surface of the bottom insulation ring (132) in the vertical plane includes, radially from the outside to the inside, a first horizontal section (1321), a transition section and a second horizontal section (1322), wherein the second horizontal section (1322) is higher than the first horizontal section (1321).

3. The high temperature furnace according to claim 2, characterized in that: The transition segment includes a plurality of line segments that are not on the same straight line.

4. The high temperature furnace according to claim 1, characterized in that The upper furnace body also includes: A top heat-insulating body (160) extends downward from the top wall (151) of the shell (15) to connect with the lateral heat-insulating ring, and a portion of the lower end surface of the top heat-insulating body (160) defines and forms the top wall of the furnace cavity (101).

5. The high temperature furnace according to claim 1, characterized in that: The heating section comprises, 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. Wherein, when the upper furnace body and the base (13) are connected to form the furnace cavity (101), The upper heating section (171) is located above the test sample (200); The middle heating section (172) faces the test sample (200); The lower heating section (173) faces the pressure joint (141).

6. The high temperature furnace according to claim 5, characterized in that: Also includes: a first temperature measuring portion (21), extending downward from the top wall (151) of the shell (15) in the furnace cavity (101) to a position located in the middle of the upper heating section (171), and used for measuring the temperature above the test sample (200); A second temperature measuring portion (22) extends downward from the top wall (151) of the shell (15) in the furnace chamber (101) to a position in the middle of the middle heating section (172), and is used to measure the temperature of the middle of the test sample (200); A third temperature measuring portion (23) extends downward from the top wall (151) of the shell (15) in the furnace cavity (101) to a position located in the lower heating section (173), and is used to measure the temperature of the pressure joint (141); and a temperature control unit 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 a first preset temperature; adjusting the heating power of the middle heating section (172) according to the temperature detected by the second temperature measuring portion (22) and the second preset temperature; The heating power of the lower heating section (173) is adjusted according to the temperature detected by the third temperature measuring portion (23) and the third preset temperature.

7. The high temperature furnace according to claim 5, characterized in that: The lateral heat preservation ring comprises a first heat preservation ring (161), a second heat preservation ring (162), a third heat preservation ring (163) and a fourth heat preservation ring (164) which are connected in sequence from top to bottom. The lower end surface of the fourth thermal insulation ring (164) is matched with the upper end surface of the bottom thermal insulation ring (132). When the upper furnace body and the base (13) are connected to form the furnace cavity (101), the lower end surface of the fourth thermal insulation ring (164) is in contact with the upper end surface of the bottom thermal insulation ring (132).

8. The high temperature furnace according to claim 7, characterized in that: The upper heating section (171) is provided on the first heat-insulating ring (161), the middle heating section (172) is provided on the second heat-insulating ring (162), and the lower heating section (173) is provided on the third heat-insulating ring (163); When the upper furnace body and the base (13) are connected to form the furnace cavity (101), The first thermal insulation ring (161) is located above the test sample (200), the second thermal insulation ring (162) faces the test sample (200), the third thermal insulation ring (163) faces the pressure connector (141), and the fourth thermal insulation ring (164) faces the pressure supply line (142).

9. The high temperature furnace according to claim 8, characterized in that: The inner diameter of the fourth thermal insulation ring (164) is smaller than the inner diameters of the first thermal insulation ring (161), the second thermal insulation ring (162), and the third thermal insulation ring (163).

10. The high temperature furnace according to claim 7, characterized in that: The radial outer surfaces of the second thermal insulation ring (162), the third thermal insulation ring (163), and the fourth thermal insulation ring (164) are provided with a high-temperature resistant heat-insulating coating.

11. The high temperature furnace according to claim 1, characterized in that: The side wall (152) of the housing (15) is provided with a peep window (18) for observing the test sample (200) in the furnace cavity (101); A clearance groove is provided at a position of the lateral heat-insulating ring facing the peek window (18).

12. The high temperature furnace according to claim 1 or 11, characterized in that: Also includes: Fixed table (11); and A rotating platform (12) is rotatably arranged above the fixed platform (11); Wherein, the base (13) and the upper furnace body are both arranged on the rotating platform (12) to rotate along with the rotating platform (12); The base (13) can rotate relative to the pressure supply pipeline (142).

13. The high temperature furnace according to claim 12, characterized in that: A hollow rotating shaft (131) is provided on the radial inner side of the bottom heat-insulating ring (132), and the rotating shaft (131) extends downward through the rotating platform (12) and the fixed platform (11) in sequence to the fixed platform (11), wherein the rotating shaft (131) is configured to be fixedly connected to the rotating platform (12) and relatively rotatable with the fixed platform (11); The pressure supply pipeline (142) extends upward inside the rotating shaft (131) to above the base (13), and the rotating shaft (131) can rotate relative to the pressure supply pipeline (142).

14. The high temperature furnace according to claim 13, characterized in that: Also includes: A vacuum pumping pipeline (143) extends from the radial inner side of the rotating shaft (131) to the furnace chamber (101), and the rotating shaft (131) and the vacuum pumping pipeline (143) are rotatable relative to each other. The pressure supply pipeline (142) is located radially inward of the vacuum pumping pipeline (143); a through hole (1430) is provided on the pipe section of the vacuum pumping pipeline (143) located inside the furnace cavity (101); and the vacuum pumping pipeline (143) is connected to the furnace cavity (101) through the through hole (1430).

15. The high temperature furnace according to claim 14, characterized in that: Also includes: a sealing sleeve (91), the sealing sleeve (91) passing through the fixing platform (11) and being fixedly connected to the fixing platform (11), the lower end of the rotating shaft (131) being located radially inward of the sealing sleeve (91); a sealing ring (92) disposed in the sealing sleeve (91) and configured to abut against the rotating shaft (131) to form a dynamic seal; and The vacuum chamber (144) is located below the sealing sleeve (91); the vacuum pumping line (143) extends downward from the rotating shaft (131) and the sealing sleeve (91) and is in communication with the vacuum chamber (144); and the pressure supply line (142) enters the vacuum chamber (144) from the vacuum pumping line (143) and extends outward.

16. The high temperature furnace according to claim 12, characterized in that: Also includes: The rotation driving unit (51) is arranged on the fixed platform (11) and drives the rotating platform (12) to rotate relative to the fixed platform (11).

17. The high temperature furnace according to claim 12, characterized in that: Also includes: A plurality of support rods (31) extending vertically upward from the rotating platform (12), and the upper furnace body is slidably disposed on the plurality of support rods (31) in a vertical direction via a slider (33); and A driving mechanism is used to drive the upper furnace body to move vertically relative to the base (13).

18. The high temperature furnace according to claim 11, characterized in that A heat dissipation cover (19) is further provided on the radially outer side of the side wall (152) of the housing (15), and the heat dissipation cover (19) is provided with a clearance opening (192) and a plurality of heat dissipation fins (191) extending vertically; and / or The upper surface of the top wall (151) of the housing (15) is provided with a plurality of concentric annular grooves.

19. The high temperature furnace according to claim 1, characterized in that An inner cavity (1521) is formed inside the side wall (152) of the shell (15) for allowing the cooling medium to flow.

20. The high temperature furnace according to claim 1, characterized in that A sealing strip (153) is provided at the lower end of the side wall (152) of the housing (15) for sealing with the base (13).

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