Dynamic sealing device and internal pressure 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 dynamic sealing device and an internal pressure test furnace. The dynamic sealing device includes: a sealing sleeve, a first sealing ring group, a second sealing ring group and a rotating shaft. The first sealing ring group is arranged in the sealing sleeve, and the first sealing ring group includes a plurality of first lip-shaped sealing rings with the same opening direction. The second sealing ring group is arranged in contact with the first sealing ring group in the sealing sleeve, and the second sealing ring group includes a plurality of second lip-shaped sealing rings with the same opening direction. The rotating shaft is arranged radially inward of the plurality of first lip-shaped sealing rings and the plurality of second lip-shaped sealing rings. The plurality of first lip-shaped sealing rings and the plurality of second lip-shaped sealing rings can abut against the rotating shaft to form a dynamic seal. The opening direction of the plurality of first lip-shaped sealing rings is opposite to the opening direction of the plurality of second lip-shaped sealing rings. The dynamic sealing device of the embodiment of the present application can achieve dynamic sealing in a high-temperature vacuum environment.

Description

Technical Field

[0001] The present invention relates to testing or analyzing materials by means of measuring the chemical or physical properties of the materials, and in particular to a dynamic sealing device and an internal pressure test furnace used in a high-temperature vacuum environment. Background Art

[0002] Internal pressure test furnaces used for internal pressure testing are typically stationary. In some cases, it is desirable to be able to rotate. However, because the interior of an internal pressure test furnace is typically a vacuum and high-temperature environment, existing dynamic sealing devices are typically used for oil seals and are not suitable for dynamic sealing in vacuum and high-temperature environments. Summary of the Invention

[0003] In response to the above technical problems, embodiments of the present application provide a dynamic sealing device and an internal pressure test furnace having the dynamic sealing device.

[0004] In a first aspect, an embodiment of the present application provides a dynamic sealing device, comprising:

[0005] Sealing sleeve;

[0006] A first sealing ring group is arranged in the sealing sleeve, and the first sealing ring group includes a plurality of first lip-shaped sealing rings with the same opening direction;

[0007] A second sealing ring group, disposed in contact with the first sealing ring group and in the sealing sleeve, the second sealing ring group including a plurality of second lip sealing rings with the same opening direction; and

[0008] a rotating shaft, disposed radially inwardly of the plurality of first lip seals and the plurality of second lip seals, and capable of rotating relative to the plurality of first lip seals and the plurality of second lip seals;

[0009] wherein the plurality of first lip seals and the plurality of second lip seals are capable of abutting against the rotating shaft to form a dynamic seal;

[0010] The opening direction of the plurality of first lip seal rings is opposite to the opening direction of the plurality of second lip seal rings.

[0011] In a second aspect, an embodiment of the present application provides an internal pressure test furnace, comprising:

[0012] Fixed table;

[0013] A rotating platform is rotatably arranged above the fixed platform;

[0014] The annular base is arranged on the rotating platform to rotate along with the rotating platform;

[0015] The upper furnace body is used to connect with the annular base to form a sealed furnace cavity;

[0016] The dynamic sealing device of the first aspect of the present application, wherein the sealing sleeve passes through the fixed platform and is fixedly connected to the fixed platform, and the rotating shaft extends upward from the sealing sleeve through the rotating platform to the radial inner side of the annular base and is fixedly connected to the annular base; and

[0017] The pressure medium supply part includes a pressure supply pipeline and a pressure joint connected to the pressure supply pipeline. The pressure supply pipeline extends from the radial inner side of the rotating shaft to the furnace cavity. The rotating shaft can rotate relative to the pressure supply pipeline. The pressure joint is used to be sealed and connected to the test sample to provide pressure medium to the inside of the test sample.

[0018] The dynamic sealing device of the embodiment of the present application can achieve dynamic sealing in a high-temperature vacuum environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 is a schematic structural diagram of a dynamic sealing device according to one embodiment of the present invention;

[0021] Figure 2 is a cross-sectional schematic diagram of a rotating shaft lip seal ring according to one embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of an internal pressure test furnace according to one embodiment of the present invention;

[0023] Figure 4 yes Figure 3 A schematic cross-sectional view of an internal pressure test furnace is shown;

[0024] Figure 5 yes Figure 4 A partial enlarged view of the internal pressure test furnace shown;

[0025] Figure 6 yes Figure 3 The diagram shows a partial structure of the internal pressure test furnace, with the upper furnace body omitted;

[0026] Figure 7 yes Figure 6 A schematic cross-sectional view of the internal pressure test furnace shown; and

[0027] Figure 8 yes Figure 7 A partial enlarged view of the internal pressure test furnace is shown.

[0028] 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.

[0029] Description of reference numerals:

[0030] 100. Internal pressure test furnace; 10. Upper furnace body; 101. Furnace cavity;

[0031] 11. Fixed platform;

[0032] 12. Rotating table;

[0033] 13. Ring base; 130. Base body; 132. Bottom insulation ring; 133. Bushing;

[0034] 141. Pressure connector; 142. Pressure supply line; 143. Vacuum line; 1430. Through hole; 1431. Upper vacuum line; 1432. Lower vacuum line; 144. Vacuum chamber; 1441. Vacuum port; 145. Support portion;

[0035] 15. Shell; 151. Top wall; 152. Side wall; 1521. Inner cavity; 153. Sealing strip;

[0036] 160, top insulation body; 161, first insulation ring; 162, second insulation ring; 163, third insulation ring; 164, fourth insulation ring;

[0037] 171, upper heating section; 172, middle heating section; 173, lower heating section;

[0038] 18. Peep window;

[0039] 21. First temperature measuring part; 22. Second temperature measuring part; 23. Third temperature measuring part;

[0040] 31. Support rod; 32. Slider;

[0041] 41. Screw shaft; 42. Ball nut; 43. Vertical drive unit;

[0042] 51. Rotation drive unit;

[0043] 91. Sealing sleeve;

[0044] 92, first lip seal ring; 921, annular body; 9211, convex portion; 922, inner lip; 9220, lip opening; 9221, conical surface; 9222, cylindrical surface; 9223, groove; 923, outer lip;

[0045] 93. Second lip seal;

[0046] 94. Top end cover;

[0047] 95. Bottom end cap;

[0048] 96. End plug; 961. Peripheral portion; 962. Protruding portion;

[0049] 97. Rotating axis;

[0050] 200. Test samples. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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.

[0054] The present application provides a dynamic sealing device. Figure 1 The dynamic sealing device includes: a sealing sleeve 91, a first sealing ring group, a second sealing ring group, and a rotating shaft 97.

[0055] The first sealing ring assembly is disposed within the sealing sleeve 91 and includes a plurality of first lip-shaped sealing rings 92 with the same opening orientation. The second sealing ring assembly is disposed within the sealing sleeve 91, adjacent to the first sealing ring assembly. As will be readily understood, the second sealing ring assembly adjoining the first sealing ring assembly means that there is no other component separating the second sealing ring assembly from the first sealing ring assembly.

[0056] The second sealing ring assembly includes multiple second lip seals 93 with the same opening direction. A rotating shaft 97 is disposed radially inward of the first and second lip seals 92, 93 and is rotatable relative to the first and second lip seals 92, 93. The first and second lip seals 92, 93 abut against the rotating shaft 97, forming a dynamic seal. The opening direction of the first lip seal 92 is opposite to that of the second lip seal 93.

[0057] The embodiment of the present application greatly increases the dynamic sealing performance between the sealing sleeve 91 and the rotating shaft 97 by arranging multiple first lip-shaped sealing rings 92 and multiple second lip-shaped sealing rings 93 between the sealing sleeve 91 and the rotating shaft 97, and setting the opening direction of the first lip-shaped sealing ring 92 to be opposite to the opening direction of the second lip-shaped sealing ring 93, so that the dynamic sealing performance between the sealing sleeve 91 and the rotating shaft 97 is greatly increased, so that the dynamic sealing device can achieve dynamic sealing in a high-temperature vacuum environment.

[0058] In some embodiments, the sealing sleeve 91 extends vertically, and the first sealing ring group connects to the second sealing ring group above the second sealing ring group. The openings of all second lip sealing rings 93 are set upward, and the openings of all first lip sealing rings 92 are set downward.

[0059] In some embodiments, when the temperature and / or vacuum degree of the first sealing ring group is lower than the temperature and / or vacuum degree of the second sealing ring group, the number of second lip sealing rings 93 is greater than the number of first lip sealing rings 92.

[0060] Since better sealing is required under high temperature and / or high vacuum conditions, the embodiment of the present application specifically makes the number of second lip seals 93 greater than the number of first lip seals 92, so that for a device having the dynamic sealing device of the embodiment of the present application, when the rotating shaft 97 rotates, the multiple first lip seals 92 and the multiple second lip seals 93 in the sealing sleeve 91 can ensure that no air leakage occurs inside the device under high temperature and / or vacuum environment.

[0061] exist Figure 1 In the illustrated embodiment, the number of the second lip seals 93 is three, and the number of the first lip seals 92 is two.

[0062] In some embodiments, the first lip seal ring 92 and the second lip seal ring 93 are lip seal rings with the same structure. The lip seal rings can be made of rubber. For example, the lip seal rings can be made of high-temperature resistant rubber.

[0063] See also Figure 2 The lip seal ring includes an annular body 921, an inner lip 922 and an outer lip 923 extending from the radial inner and outer peripheries of the annular body 921, respectively. The annular body 921, the inner lip 922 and the outer lip 923 together form an opening. It is easy to understand that for Figure 2 The lip seal is shown with its opening facing upward.

[0064] The extension direction of the outer lip 923 ( Figure 2 The outer lip 923 (shown as extending vertically upward) is parallel to the axis Z of the annular body 921 (axis Z is vertical in the figure). The surface of the inner lip 922 facing away from the outer lip 923 (i.e., the radially inner surface of the entire lip seal ring) includes a conical surface 9221 extending obliquely from the radially inner periphery of the annular body 921 away from the outer lip 923, and a cylindrical surface 9222 extending from the conical surface 9221 in the direction of the axis Z of the annular body 921. As will be readily understood, the junction of the conical surface 9221 and the cylindrical surface 9222 forms a lip opening 9220. A lip seal ring with this structure can ensure both dynamic sealing and smooth rotation of the rotating shaft 97 relative to the multiple lip seal rings.

[0065] In some embodiments, the surface of the inner lip 922 facing the outer lip 923 extends obliquely from the annular body 921 in a direction away from the outer lip 923. In some embodiments, an inwardly recessed groove 9223 is further provided on this surface at a location corresponding to the lip opening 9220. In other words, the surface of the inner lip 922 facing the outer lip 923 is provided with an inwardly recessed groove 9223 corresponding to the junction of the conical surface 9221 and the cylindrical surface 9222.

[0066] When a medium such as gas or fluid flows into the opening of the lip seal ring, the medium will squeeze the inner lip 922 and the outer lip 923. In particular, the medium flowing into the groove 9223 of the inner lip 922 will squeeze the lip 9220 toward the rotating shaft 97. At the same time, due to the special shape of the lip 9220, the contact area between the lip 9220 and the rotating shaft 97 is smaller, thereby ensuring both dynamic sealing performance and smooth rotation of the rotating shaft 97 relative to the lip seal ring.

[0067] In some embodiments, the inner lip 922 and the outer lip 923 have the same height along the axis Z direction of the annular body 921. In other words, the end surfaces of the inner lip 922 and the outer lip 923 are in the same plane. A protrusion 9211 is formed on the radially outer periphery of the annular body 921, facing away from the outer lip 923. A stepped surface is formed between this protrusion 9211 and the remaining surface of the annular body 921 facing away from the opening. In this embodiment of the present application, by ensuring that the inner lip 922 and the outer lip 923 have the same height along the axis Z direction of the annular body 921 and providing the protrusion 9211, the outer lip 923 of one of the adjacent first lip-shaped seal rings 92 (or adjacent second lip-shaped seal rings 93) in the first sealing ring set (or second sealing ring set) is in contact with the annular body 921 of the other (or second) lip-shaped seal ring, while the inner lip 922 of the first sealing ring set is not in contact with the annular body 921 of the second sealing ring. Therefore, the annular body 921 of the latter will not squeeze the inner lip 922 of the former. When the rotating shaft 97 has an inevitable and slight offset during the rotation process, the inner lip 922 of the former is conducive to automatically adjusting to adapt to the offset in an interference state.

[0068] In some embodiments, the rotating shaft 97 is a hollow tubular structure, with one end of the rotating shaft 97 extending out of the sealing sleeve 91 and the other end located inside the sealing sleeve 91 , that is, the other end is located radially inward of the sealing sleeve 91 .

[0069] In such an embodiment, the dynamic sealing device further includes an end plug 96 , which is disposed radially inwardly of the sealing sleeve 91 and is used to seal a port on one side of the sealing sleeve 91 .

[0070] In such an embodiment, dynamic sealing between the first sealing ring group and the second sealing ring group and the rotating shaft 97 can prevent the interior of the rotating shaft 97 from communicating with the external environment.

[0071] Furthermore, the end surface of the end plug 96 facing the rotating shaft 97 includes a peripheral portion 961 facing the end surface of the rotating shaft 97 and a protrusion 962 extending radially inwardly of the rotating shaft 97. A gap exists between the peripheral portion 961 and the end surface of the rotating shaft 97, and a gap exists between the protrusion 962 and the radially inner surface of the rotating shaft 97. In this embodiment, when a pipeline (such as the vacuum pipeline 143 described below) is disposed within the rotating shaft 97, the end plug 96 can serve to provide passage for the pipeline and provide support for the pipeline.

[0072] In some embodiments, the dynamic sealing device further includes: a top end cover 94 disposed on the top of the sealing sleeve 91 , and a gap exists between the top end cover 94 and the rotating shaft 97 .

[0073] The dynamic sealing device further comprises a bottom end cover 95, which is disposed at the bottom of the sealing sleeve 91 and is fixedly connected to the end plug 96. The top end cover 94 and the bottom end cover 95 can be flange structures.

[0074] In some embodiments, a sealing ring may be provided between the top end cover 94 and the rotating shaft 97 . A sealing ring may be provided between the protrusion 962 and the radial inner surface of the rotating shaft 97 .

[0075] Based on the dynamic sealing device of the embodiment of the present application, the embodiment of the present application also provides an internal pressure test furnace.

[0076] See also Figures 3 to 5 The internal pressure 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, a dynamic sealing device of any embodiment of the present application, and a pressure medium providing part.

[0077] The fixed platform 11 can be arranged to be stationary. For example, the fixed platform 11 can be mounted on the bottom of the working panel, or the fixed platform 11 can be the working panel itself. The rotating platform 12 is rotatably arranged above the fixed platform 11. In other words, the rotating platform 12 is arranged above the fixed platform 11 and can rotate relative to the fixed platform 11.

[0078] See also Figure 6 and Figure 7 , 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.

[0079] The upper furnace body 10 is configured to connect with the annular base 13 to form a sealed furnace chamber 101. Specifically, the upper furnace body 10 can be mounted on a rotating platform 12 so as to rotate with the rotating platform 12. The upper furnace body 10 can move up and down relative to the annular base 13, connecting with the annular base 13 to form the furnace chamber 101, or separating from the annular base 13 to open the furnace chamber 101.

[0080] The sealing sleeve 91 passes through the fixed platform 11 and is fixedly connected to the fixed platform 11 . The rotating shaft 97 extends upward from the sealing sleeve 91 through the rotating platform 12 to the radial inner side of the annular base 13 and is fixedly connected to the annular base 13 .

[0081] 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 extends from the radially inner side of the rotating shaft 97 to the furnace chamber 101. The rotating shaft 97 is rotatable relative to the pressure supply line 142. The pressure connector 141 is used to seal the test sample 200 to provide pressure medium to the interior of the test sample 200.

[0082] The internal pressure test furnace 100 of the embodiment of the present application is equipped with the dynamic sealing device of the embodiment of the present application, so that the upper furnace body 10 can rotate relative to the test sample 200 to uniformly heat the test sample 200; and when the furnace cavity 101 is in a high temperature state, the dynamic sealing device can be used to ensure the sealing of the furnace cavity 101.

[0083] In some embodiments, the fixed platform 11 and the rotating platform 12 are spaced apart; the upper end surface of the top end cover 94 of the dynamic sealing device does not contact any components, thereby significantly reducing the temperature of the sealing ring group of the dynamic sealing device.

[0084] A bushing 133 may be provided between the pressure supply line 142 and the upper end of the rotating shaft 97 to enable the rotating shaft 97 to rotate relative to the pressure supply line 142. The bushing 133 may be made of stainless steel and be resistant to high temperatures.

[0085] See also Figure 8 In some embodiments, the pressure medium supply unit further includes a vacuum pumping line 143 extending radially inward from the rotating shaft 97 to the furnace chamber 101. The rotating shaft 97 and the vacuum pumping line 143 are rotatable relative to each other. A bushing 133 is disposed between the pressure supply line 142 and the upper end of the rotating shaft 97.

[0086] 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 97, 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.

[0087] 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 .

[0088] 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.

[0089] 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.

[0090] The lower section of the upper vacuum pipeline 1431 is located inside the rotating shaft 97 . The section of the upper vacuum pipeline 1431 located inside the rotating shaft 97 may also be provided with at least one through hole 1430 , thereby facilitating vacuuming the inside of the rotating shaft 97 .

[0091] In some embodiments, the internal pressure test furnace 100 of the present application may further include a vacuum chamber 144. The vacuum chamber 144 is located below the sealing sleeve 91. A vacuum pumping line 143 extends downward from the rotating shaft 97 and the end plug 96, communicating with the vacuum chamber 144. It will be readily understood that the vacuum chamber 144 is not connected to the interior of the sealing sleeve 91; it is connected only to the furnace chamber 101 via the vacuum pumping line 143, thereby evacuating the furnace chamber 101 using a vacuum pump. In some embodiments, the vacuum chamber 144 is formed by a downward extension of the bottom end cap 95.

[0092] Vacuum chamber 144 has a vacuum port 1441 connected to a vacuum pump via a pipeline. A pressure supply line 142 extends from vacuum pump line 143 into vacuum chamber 144 and outward. After exiting vacuum chamber 144, pressure supply line 142 can be connected to a high-pressure medium source via a pipeline to supply high-pressure medium.

[0093] 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.

[0094] Internal pressure test furnace 100 also includes a support portion 145 disposed between rotating shaft 97 and vacuum line 143 for supporting vacuum line 143. Support portion 145 is supported by end plug 96, and rotating shaft 97 is rotatable relative to support portion 145. The provision of support portion 145 ensures contact and friction-free operation between vacuum line 143 and rotating shaft 97, while also improving the stability of the pressure medium supply unit.

[0095] In some embodiments, the internal pressure test furnace 100 further includes a vacuum pump for evacuating the furnace chamber 101. Therefore, before performing an internal pressure test on the test sample 200, the vacuum pump can be used to evacuate the furnace chamber 101 to conduct the internal pressure test under high-temperature vacuum conditions. In some embodiments, the vacuum pump can be a vacuum pump.

[0096] The internal pressure test furnace 100 of the embodiment of the present application is provided with the dynamic sealing device of the embodiment of the present application, thereby ensuring that the furnace chamber 101 does not leak in a high-temperature vacuum environment.

[0097] The pressure connector 141 may have a threaded interface. A closed connector may be mounted on one end of the test sample 200, while a connector with an air passage may be mounted on the other end. The connector with an air passage on the test sample 200 may have a threaded interface, which allows for a sealed connection with the pressure connector 141. The pressure connector 141 may support the test sample 200.

[0098] The test sample 200 may be, for example, a radioactive sample. In some embodiments, the test sample 200 may be a cladding tube sample.

[0099] In some embodiments, the internal pressure test furnace 100 further includes a rotation driving unit 51 disposed on the fixed platform 11 for driving the rotary platform 12 to rotate relative to the fixed platform 11. The rotation driving unit 51 may be a servo motor.

[0100] In some embodiments, the internal pressure test furnace 100 can be a lifting furnace. The internal pressure test furnace 100 further includes a plurality of support rods 31 and a drive mechanism. The upper furnace body 10 is vertically slidably mounted on the plurality of support rods 31 via sliders 32. The drive mechanism is configured to drive the upper furnace body 10 to move vertically relative to the annular base 13.

[0101] 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 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 42 together constitute a ball screw.

[0102] In some embodiments, the upper furnace body 10 includes: a shell 15, a lateral insulation ring and a heating part.

[0103] 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.

[0104] 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 .

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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 pressure joint 141 and is used to heat the position of the furnace cavity 101 where the pressure joint 141 is located.

[0109] 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.

[0110] 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.

[0111] 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 .

[0112] 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 pressure joint 141; and the fourth insulation ring 164 faces the pressure supply line 142.

[0113] The internal pressure test furnace 100 further 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 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 pressure joint 141.

[0114] 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 .

[0115] 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.

[0116] Specifically, when the temperature detected by the temperature measuring unit is lower than a preset temperature, the temperature 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 temperature 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.

[0117] In some embodiments, the annular base 13 includes a bottom insulation ring 132. The lower end surface of the fourth insulation ring 164 is contoured to match 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 is in contact with the upper end surface of the bottom insulation ring 132.

[0118] 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.

[0119] In some embodiments, the side wall 152 is provided with a peep window 18 for observing the test sample 200 within the furnace cavity 101. A clearance groove is provided on the lateral insulation layer facing the peep window 18. Because the second insulation ring 162 faces the test sample 200, a clearance groove can be provided on the second insulation ring 162.

[0120] See also Figure 7 The annular base 13 may further include a base body 130. The periphery of the base body 130 protrudes upward to form an annular rib. The bottom insulation ring 132 is mounted on the base body 130 and located radially inward of the annular rib. When the upper furnace body 10 and the annular base 13 are connected to form the furnace chamber 101, the sidewall 152 of the shell 15 seals against the annular rib of the base body 130.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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. An internal pressure test furnace, characterized in that: include: Fixed table (11); A rotating platform (12) is rotatably arranged above the fixed platform (11); An annular base (13) is arranged on the rotating platform (12) to rotate along with the rotating platform (12); An upper furnace body (10) is used to connect with the annular base (13) to form a sealed furnace chamber (101); A dynamic sealing device, comprising: Sealing sleeve (91); A first sealing ring group is arranged in the sealing sleeve (91), the first sealing ring group comprising a plurality of first lip-shaped sealing rings (92) with the same opening direction; A second sealing ring group, disposed in contact with the first sealing ring group and within the sealing sleeve (91), the second sealing ring group comprising a plurality of second lip sealing rings (93) having the same opening direction; and a rotating shaft (97) disposed radially inward of the plurality of first lip-shaped sealing rings (92) and the plurality of second lip-shaped sealing rings (93), and capable of rotating relative to the plurality of first lip-shaped sealing rings (92) and the plurality of second lip-shaped sealing rings (93); wherein the plurality of first lip-shaped sealing rings (92) and the plurality of second lip-shaped sealing rings (93) are capable of abutting against the rotating shaft (97), thereby forming a dynamic seal; The opening direction of the plurality of first lip-shaped sealing rings (92) is opposite to the opening direction of the plurality of second lip-shaped sealing rings (93); The sealing sleeve (91) passes through the fixed platform (11) and is fixedly connected to the fixed platform (11); the rotating shaft (97) extends upward from the sealing sleeve (91) through the rotating platform (12) to the radial inner side of the annular base (13) and is fixedly connected to the annular base (13); The internal pressure test furnace further includes a pressure medium supply portion, including a pressure supply pipeline (142) and a pressure joint (141) connected to the pressure supply pipeline (142), wherein the pressure supply pipeline (142) extends from the radial inner side of the rotating shaft (97) to the furnace chamber (101), and the rotating shaft (97) can rotate relative to the pressure supply pipeline (142), and the pressure joint (141) is used to be sealed and connected to the test sample (200) to provide pressure medium to the inside of the test sample (200).

2. The internal pressure test furnace according to claim 1, characterized in that: Also includes: A vacuum pumping pipeline (143) extends from the radial inner side of the rotating shaft (97) to the furnace chamber (101), and the rotating shaft (97) 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).

3. The internal pressure test furnace according to claim 2, characterized in that: Also includes: The vacuum chamber (144) is located below the sealing sleeve (91), the vacuum pumping line (143) extends downward from the rotating shaft (97) and the end plug (96) of the dynamic sealing device, and is connected to the vacuum chamber (144), and the pressure supply line (142) enters the vacuum chamber (144) from the vacuum pumping line (143) and extends outward.

4. The internal pressure test furnace according to claim 2, characterized in that: Also includes: A support portion (145) is provided between the rotating shaft (97) and the vacuum pumping pipeline (143) and is used to support the vacuum pumping pipeline (143). The support portion (145) is supported by the end plug (96) of the dynamic sealing device, and the rotating shaft (97) is rotatable relative to the support portion (145).

5. The internal pressure test furnace according to claim 1, characterized in that: The temperature and / or vacuum degree of the side where the first sealing ring group is located are lower than the temperature and / or vacuum degree of the side where the second sealing ring group is located. The number of the second lip sealing rings (93) is greater than the number of the first lip sealing rings (92).

6. The internal pressure test furnace according to claim 1, characterized in that: The first lip seal ring (92) and the second lip seal ring (93) are lip seal rings with the same structure. The lip seal ring comprises an annular body (921), an inner lip (922) and an outer lip (923) respectively extending from radial inner and outer peripheries of the annular body (921), wherein the annular body (921), the inner lip (922) and the outer lip (923) together form the opening; Wherein, the extension direction of the outer lip (923) is parallel to the axis of the annular body (921). The surface of the inner lip (922) facing away from the outer lip (923) includes a conical surface (9221) extending obliquely from the radial inner peripheral edge of the annular body (921) in a direction away from the outer lip (923) and a cylindrical surface (9222) extending from the conical surface (9221) along the axial direction of the annular body (921).

7. The internal pressure test furnace according to claim 6, characterized in that: The inner lip (922) and the outer lip (923) have the same height along the axial direction of the annular body (921).

8. The internal pressure test furnace according to claim 6, characterized in that: The annular body (921) is formed with a convex portion (9211) from its radially outer peripheral edge in a direction opposite to the outer lip (923).

9. The internal pressure test furnace according to claim 6, characterized in that: The surface of the inner lip (922) facing the outer lip (923) is provided with an inwardly recessed groove (9223) corresponding to the connection between the conical surface (9221) and the cylindrical surface (9222).

10. The internal pressure test furnace according to claim 1, characterized in that: The rotating shaft (97) is a hollow tubular structure. One end of the rotating shaft (97) is located radially inward of the sealing sleeve (91), and the dynamic sealing device further comprises: An end plug (96) is arranged on the radial inner side of the sealing sleeve (91) and is used to seal a port on one side of the sealing sleeve (91).

11. The internal pressure test furnace according to claim 10, characterized in that: The end face of the end plug (96) facing the rotating shaft (97) includes a peripheral portion (961) facing the end face of the rotating shaft (97) and a protruding portion (962) extending into the radial inner side of the rotating shaft (97), wherein a gap exists between the peripheral portion (961) and the end face of the rotating shaft (97); and a gap exists between the protruding portion (962) and the radial inner surface of the rotating shaft (97).

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