Sodium-potassium alloy filling equipment

Abstract

The utility model discloses sodium-potassium alloy filling equipment, which relates to the field of filling equipment, and comprises a glove box and a vacuum system, the vacuum system comprises a sodium-potassium alloy container arranged in the glove box, a vacuumizing pipeline, a reverse vacuumizing tool, a reverse vacuumizing pipeline connected with the reverse vacuumizing tool, and a vacuum pump arranged outside the glove box, the first vacuum system is sequentially connected with a vacuum buffer tank, a vacuumizing pipeline and a sodium-potassium alloy tank which are arranged in the glove box through a first vacuum pump arranged outside the glove box, a parallel main pipeline is arranged on the vacuumizing pipeline, and at least one group of paired branch pipelines for filling the same pressure sensor is arranged on the parallel main pipeline; and the second vacuum system is connected with reverse vacuumizing tools at the two ends of the pressure sensor through a second vacuum pump arranged outside the glove box and a reverse vacuumizing pipeline arranged in the glove box. According to the utility model, the filling qualified rate of the pressure sensor is improved, and the filling efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of filling equipment, and in particular relates to sodium-potassium alloy filling equipment. Background Art

[0002] Sodium-potassium alloy is a eutectic mixture of sodium and potassium. The lowest melting point sodium-potassium alloy has a mass fraction of 22.8% Na and 77.2% K. At 101.325 kPa, it has a melting point of -12.6°C and a boiling point of 785°C. It can remain liquid in environments with low and high temperatures, as well as those with large temperature differences. Therefore, sodium-potassium alloy can replace silicone oil with a lower melting point as a pressure transmission medium in high-temperature environments and is used in pressure sensors.

[0003] Chinese invention patent CN108489658B discloses a device and method for filling an isolation capillary with sodium-potassium alloy. The device primarily comprises a device for filling the isolation capillary tube of a pressure sensor comprised of a data processing end, an isolation capillary tube, and a diaphragm end with sodium-potassium alloy. The device, housed within a vacuum glove box, includes a lower outlet sealedly connected to the upper opening of a tee, a filling funnel for storing the sodium-potassium alloy, a filling connector sealedly connected to the lower opening of the tee via a first hose, and a sealing connection to the end of the isolation capillary tube located on the data processing end. The device also includes a vacuum fixture sealedly connected to the diaphragm end, a second hose sealingly connecting a vacuum system to the lateral opening of the tee, and a third hose sealingly connecting the vacuum system to the vacuum fixture. Valves are provided between the vacuum system and the second and third hoses, as well as on the upper and lateral openings of the tee.

[0004] In combination with the above-mentioned patent, the device has the following defects. First, it only performs vacuum extraction from one end of the capillary. As the capillary grows, the pressure loss gradually increases, resulting in inconsistent vacuum degrees at the proximal and distal ends of the pressure sensor vacuum interface, residual air inside the pressure sensor, and inaccurate readings; second, since the sodium-potassium alloy container of the device is a funnel-shaped device, and the sodium-potassium alloy outlet is at the bottom of the funnel, the density of the oxide after oxidation of the sodium-potassium alloy is higher than that of the alloy, it will settle at the bottom of the funnel and cause blockage in the pipeline. At the same time, the device and method are only suitable for filling a single device. The canning needs of multiple devices can only be achieved by repeating the above method, which is more cumbersome. Utility Model Content

[0005] A sodium-potassium alloy filling device includes a glove box and a vacuum system, wherein the vacuum system includes a sodium-potassium alloy container arranged in the glove box, a vacuum pumping pipeline, a back-pumping tool, a back-pumping pipeline connected to the back-pumping tool, and a vacuum pump arranged outside the glove box. The vacuum system includes a first vacuum system and a second vacuum system, wherein the first vacuum system is a positive vacuum system, in which a first vacuum pump arranged outside the glove box is sequentially connected to a vacuum buffer tank, a vacuum pumping pipeline, and a sodium-potassium alloy tank arranged in the glove box, a parallel main line is provided on the parallel main line, and at least one set of paired branch lines for filling the same pressure sensor is provided on the parallel main line. The second vacuum system is a back-pumping vacuum system, in which a second vacuum pump arranged outside the glove box is connected to both ends of the pressure sensor through a back-pumping pipeline arranged in the glove box.

[0006] Furthermore, the sodium-potassium alloy tank includes a tank body, a cover body is fixedly provided on the top of the tank body, and at least one feed pipe is provided in the tank body and extends into the tank body, and the feed pipe is connected to the vacuum pipeline.

[0007] Furthermore, two relative branch lines on the parallel main line are used to fill the same pressure sensor, one of which is connected to the distal interface through a fourth hose, the other is connected to one end of the second hose, the other end of the second hose is connected to the first hose and one end of the third hose through a tee, the other end of the first hose is connected to the upper end of the feed pipe, and the other end of the third hose is connected to the proximal interface of the pressure sensor.

[0008] Furthermore, the second hose is provided with a fourth clamping point, the first hose is provided with a first clamping point, a second clamping point and a third clamping point, the third hose is provided with a fifth clamping point, and the fourth hose is provided with a sixth clamping point.

[0009] Furthermore, one end of the parallel main pipeline relative to the branch pipeline is a quick-connect structure. When no other components are connected, one end is in a closed state, and the other end is connected to the vacuum buffer tank.

[0010] Furthermore, two adjacent branch lines for filling the same pressure sensor are provided on the parallel main line, one of the branch lines is connected to the distal interface of the pressure sensor through a fourth hose, the other branch line is connected to the proximal interface of the pressure sensor through a third hose, and one end of the parallel main line is connected to the upper end of the feed port of the sodium-potassium alloy tank through a first hose.

[0011] Furthermore, a fifth clamping point is provided on the third hose, a first clamping point, a second clamping point and a third clamping point are provided on the first hose, a sixth clamping point is provided on the fourth hose, and a valve is provided between two adjacent branch pipes on the parallel main pipe for filling the same pressure sensor.

[0012] Furthermore, the vacuum buffer tank is provided with an absolute pressure gauge, a buffer tank outlet pipe and a buffer tank inlet pipe. The buffer tank outlet pipe is connected to the first vacuum pump, and the buffer tank inlet pipe is connected to the parallel main line.

[0013] Furthermore, the back-pump vacuum pipeline includes a back-pump main pipe, a second back-pump hose and a first back-pump hose. The second vacuum pump is connected to one end of the back-pump main pipe, and the other end of the back-pump main pipe is connected to the first back-pump hose and the second back-pump hose through a connecting piece, wherein the end of the first back-pump hose away from the back-pump main pipe is connected to the proximal back-pump tooling, and the end of the second back-pump hose away from the back-pump main pipe is connected to the distal back-pump tooling, and the proximal back-pump tooling and the distal back-pump tooling are respectively sealed and connected to the two ends of the pressure sensor.

[0014] Furthermore, the first vacuum pump is a molecular vacuum pump, and the second vacuum pump is a common vacuum pump.

[0015] The structure of the first vacuum system and the second vacuum system described above enables the simultaneous filling of multiple pressure sensors. Furthermore, by vacuuming both ends of the pressure sensor, the gradual increase in pressure loss as the capillary grows is minimized, which can lead to inconsistent vacuum levels at the proximal and distal ends of the pressure sensor's vacuum interface, residual air within the pressure sensor, and inaccurate readings. Furthermore, since reverse vacuuming does not require absolute vacuum, while positive vacuuming requires absolute vacuum, a conventional vacuum pump is used for reverse vacuuming, while a molecular vacuum pump is used for positive vacuuming. This avoids using the same vacuum pump for both positive and reverse vacuuming, which places excessive load on the vacuum pump. Furthermore, molecular vacuum pumps are much more expensive than conventional vacuum pumps. Reducing the load on the molecular vacuum pump helps extend its service life, thereby saving costs.

[0016] The structure of the sodium-potassium alloy tank allows the sodium-potassium alloy to sink to the bottom after oxidation, thereby avoiding pipeline blockage caused by the absorption of sodium-potassium oxides into the pipeline during the filling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of filling the pressure sensor in Example 1 of the present utility model;

[0018] Figure 2 This is a schematic diagram of filling the pressure sensor in Example 2 of the present utility model;

[0019] In the picture:

[0020] 001. Glove box;

[0021] 002. Sodium-potassium alloy tank; 021. Tank body; 022. Cover; 023. Feed pipe;

[0022] 003. First vacuum pump; 031. First hose; 311. First pinch point; 312. Second pinch point; 213. Third pinch point; 032. Second hose; 321. Fourth pinch point; 033. Third hose; 331. Fifth pinch point; 034. Fourth hose; 341. Sixth pinch point; 035. Parallel main line; 036. Valve;

[0023] 004. Second vacuum pump; 041. First back-pump hose; 042. Second back-pump hose; 043. Back-pump main pipe;

[0024] 005. Pressure sensor; 051. Proximal retraction tooling; 052. Distal retraction tooling; 053. Proximal interface; 054. Distal interface;

[0025] 006. Vacuum buffer tank; 061. Buffer tank inlet pipe; 062. Buffer tank outlet pipe; 063. Absolute pressure gauge; DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "horizontal", "inner", "outer", "one side", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or circuit connections; they can be direct connections, indirect connections through an intermediate medium, or internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example 1

[0028] like Figure 1As shown, this embodiment discloses a sodium-potassium alloy filling device comprising a glove box and a vacuum system, wherein the vacuum system comprises a sodium-potassium alloy container arranged in the glove box, a vacuum pumping line, a back-pumping tool, a back-pumping line connected to the back-pumping tool, and a vacuum pump arranged outside the glove box. The feature is that the vacuum system comprises a first vacuum system and a second vacuum system, wherein the first vacuum system is a positive vacuum system, in which a first vacuum pump 003 arranged outside the glove box 001 is sequentially connected to a vacuum buffer tank 006 arranged in the glove box 001, a vacuum pumping line, and a sodium-potassium alloy tank 002, a parallel main line 035 is provided on the parallel main line 035, and at least one pair of branch lines for filling the same pressure sensor 005 is provided on the parallel main line 035; the second vacuum system is a back-pumping system, in which a second vacuum pump 004 arranged outside the glove box 001 is connected to both ends of the pressure sensor 005 through a back-pumping line arranged in the glove box 001; the vacuum buffer tank 006 is used to buffer the speed of vacuum extraction to avoid damage to the device caused by excessive vacuum extraction.

[0029] In this embodiment, the sodium-potassium alloy tank 002 comprises a tank body 021, with a cap 022 fixedly mounted on the top. At least one feed pipe 023 is disposed within the tank body 021 and extends into the tank body 021. Feed pipe 023 is connected to a vacuum line. The vacuum line is used to fill the pressure sensor 005, and the sodium-potassium alloy tank 002 is used to supply the sodium-potassium alloy to the filling line.

[0030] In this embodiment, the parallel main line 035 is used to fill two relative branch lines of the same pressure sensor 005, one of which is connected to the distal interface 054 through the fourth hose 034, and the other branch is connected to one end of the second hose 032. The other end of the second hose 032 is connected to the first hose 031 and one end of the third hose 033 through a tee. The other end of the first hose 031 is connected to the upper end of the feed pipe 023, and the other end of the third hose 033 is connected to the proximal interface 053 of the pressure sensor 005.

[0031] In this embodiment, a fourth clamping point 321 is provided on the second hose 032, a first clamping point 311, a second clamping point 312 and a third clamping point 313 are provided on the first hose 031, a fifth clamping point 331 is provided on the third hose 033, and a sixth clamping point 341 is provided on the fourth hose 034; filling is achieved through the mutual cooperation between multiple clamping points.

[0032] In this embodiment, one end of the parallel main line 035 with the branch line is a quick-connect structure. When not connected to other components, one end is in a closed state, and the other end is connected to the vacuum buffer tank 006.

[0033] In this embodiment, a valve 036 is provided between two adjacent branch pipes on the parallel main pipe 035 for filling the same pressure sensor 005 .

[0034] In this embodiment, the vacuum buffer tank 006 is provided with an absolute pressure gauge 063, a buffer tank outlet pipe 062 and a buffer tank inlet pipe 061. The buffer tank outlet pipe 062 is connected to the first vacuum pump 003, and the buffer tank inlet pipe 061 is connected to the parallel main line 035.

[0035] In this embodiment, the back-pump vacuum pipeline includes a back-pump main pipe 043, a back-pump second hose 042 and a back-pump first hose 041. The second vacuum pump 004 is connected to one end of the back-pump main pipe 043, and the other end of the back-pump main pipe 043 is connected to the back-pump first hose 041 and the back-pump second hose 042 through a connecting piece, wherein the end of the first back-pump hose 041 away from the back-pump main pipe 043 is connected to the proximal back-pump tooling 051, and the end of the second back-pump hose 042 away from the back-pump main pipe 043 is connected to the distal back-pump tooling 052, and the proximal back-pump tooling 051 and the distal back-pump tooling 052 are respectively sealed and connected to the two ends of the pressure sensor 005.

[0036] In this embodiment, the first vacuum pump 003 is a molecular vacuum pump, and the second vacuum pump 004 is a common vacuum pump.

[0037] The operation process of this embodiment is as follows:

[0038] S01. Before filling, preparations must be made according to Figure 1 As shown, after all components are connected, clamp the first clamping point 311 (the other clamping points are in an open state), turn on the first vacuum pump 003 to start the first vacuum system, and turn on the second vacuum pump to start 004 the second vacuum system.

[0039] S02. After the absolute pressure gauge 063 reaches the absolute pressure, clamp the third clamping point 313 and release the first clamping point 311. At this time, the sodium-potassium alloy will move upward along the pipeline and approach the third clamping point 313.

[0040] S03. Clamp the second pinch point 312 and open the third pinch point 313. At this point, the sodium-potassium alloy and air between the second pinch point 312 and the third pinch point 313 will be drawn into the vacuum buffer tank 006 as the first vacuum pump operates. After the vacuum degree of the first vacuum system 003 reaches absolute pressure, the corresponding vacuum pumping time should be strictly maintained according to the length of the capillary in the pressure sensor. Clamp the fourth pinch point 321 and the sixth pinch point 341. At this time, open the second pinch point 312, and the sodium-potassium alloy will flow from the vacuum distal end to the vacuum proximal end.

[0041] S04. The sodium-potassium alloy flows along the pressure sensor to the sixth clamping point 341 and then clamps the fifth clamping point 331 to remove the workpiece.

[0042] S05. The second vacuum system 004 is started during the entire filling process.

[0043] S06, multiple devices are filling at the same time, press Figure 1 Connect the corresponding equipment in series and repeat the above filling steps until all the pressure sensors 005 are filled. After all the filling is completed, transfer all the pressure sensors 005 out of the vacuum glove box 001. Example 2

[0044] like Figure 2 As shown, the difference between this embodiment and embodiment 1 lies in the structure of the filling pipeline. In this embodiment, two adjacent branch pipelines for filling the same pressure sensor 005 are provided on the parallel main pipeline 035, one of which is connected to the distal interface 054 of the pressure sensor 005 via a fourth hose 034, and the other branch pipeline is connected to the proximal interface 053 of the pressure sensor 005 via a third hose 033. One end of the parallel main pipeline is connected to the upper end of the feed port of the sodium-potassium alloy tank 002 via a first hose 031.

[0045] In this embodiment, first hose 031 is sequentially provided with a first pinch point 311, a second pinch point 312, and a third pinch point 313. Third hose 033 is provided with a fifth pinch point 331. Fourth hose 034 is provided with a sixth pinch point 341. A valve 036 is provided between two adjacent branch lines of parallel main line 035, each used to fill the same pressure sensor 005.

[0046] The operation process of this embodiment is as follows:

[0047] S01. Before filling, preparations must be made according to Figure 2 As shown, after all components are connected, clamp the first clamping point 311 (the other clamping points are in an open state), turn on the first vacuum pump 003 to start the first vacuum system, and turn on the second vacuum pump 004 to start the second vacuum system.

[0048] S02. After the absolute pressure gauge 063 reaches the absolute pressure, clamp the third clamping point 313 and release the first clamping point 311. At this time, the sodium-potassium alloy will move upward along the pipeline and approach the third clamping point 313.

[0049] S03. Clamp the second pinch point 312 and open the third pinch point 313. The sodium-potassium alloy and air between the second pinch point 312 and the third pinch point 313 will be pumped into the vacuum buffer tank 006 as the molecular vacuum pump operates. When the vacuum degree of the first vacuum system 003 reaches absolute pressure, clamp the sixth pinch point 341 and close the valve 036. At this time, open the second pinch point 312, and the sodium-potassium alloy will flow along the proximal end of the pressure sensor to the distal end.

[0050] S04. The sodium-potassium alloy flows to the sixth clamping point 341 and then clamps the fifth clamping point 331 to remove the workpiece.

[0051] S05. The second vacuum system 004 is started during the entire filling process.

[0052] S06, multiple devices are filling at the same time, press Figure 2 The corresponding equipment is connected in series. During operation, in order to allow the sodium-potassium alloy to flow through the parallel main line to each pressure sensor 005 to be filled, except for the valve 036 of the pipeline connected to the pressure sensor 005 at the far right, the valves on its left side close to the sodium-potassium alloy tank 002 are all in the open state during the filling process.

[0053] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A sodium-potassium alloy filling equipment, comprising a glove box and a vacuum system, wherein: The vacuum system comprises a sodium-potassium alloy container arranged in a glove box, a vacuum pumping line, a back-pumping tooling, a back-pumping line connected to the back-pumping tooling, and a vacuum pump arranged outside the glove box. The vacuum system is characterized in that the vacuum system comprises a first vacuum system and a second vacuum system, wherein the first vacuum system is a positive vacuum system, wherein a first vacuum pump (003) arranged outside the glove box (001) is sequentially connected to a vacuum buffer tank (006) arranged in the glove box (001), the vacuum pumping line, and the sodium-potassium alloy tank (002), a parallel main line (035) is arranged on the vacuum pumping line, and at least one group of paired branch lines for filling the same pressure sensor (005) is arranged on the parallel main line (035); the second vacuum system is a back-pumping system, wherein a second vacuum pump (004) arranged outside the glove box (001) is connected to the back-pumping tooling at both ends of the pressure sensor (005) through the back-pumping line arranged in the glove box (001).

2. The sodium-potassium alloy filling equipment according to claim 1, characterized in that: The sodium-potassium alloy tank (002) comprises a tank body (021), a cover body (022) is fixedly provided on the top of the tank body (021), at least one feed pipe (023) is provided in the tank body (021) and extends into the tank body (021), and the feed pipe (023) is connected to a vacuum pipeline.

3. The sodium-potassium alloy filling equipment according to claim 2, characterized in that: Two opposite branch lines on the parallel main line (035) are used to fill the same pressure sensor (005), wherein one branch line is connected to the distal interface (054) via a fourth hose (034), the other branch line is connected to one end of the second hose (032), the other end of the second hose (032) is connected to the first hose (031) and one end of the third hose (033) via a tee, the other end of the first hose (031) is connected to the upper end of the feed pipe (023), and the other end of the third hose (033) is connected to the proximal interface (053) of the pressure sensor (005).

4. The sodium-potassium alloy filling equipment according to claim 3, characterized in that: The second hose (032) is provided with a fourth clamping point (321), the first hose (031) is provided with a first clamping point (311), a second clamping point (312), and a third clamping point (313), the third hose (033) is provided with a fifth clamping point (331), and the fourth hose (034) is provided with a sixth clamping point (341).

5. The sodium-potassium alloy filling equipment according to claim 3, characterized in that: One end of the parallel main pipe (035) with the branch pipe relatively arranged therein is a quick-connect structure. When no other components are connected, one end is in a closed state, and the other end is connected to the vacuum buffer tank (006).

6. The sodium-potassium alloy filling equipment according to claim 2, characterized in that: Two adjacent branch lines for filling the same pressure sensor (005) are provided on the parallel main line (035), one of the branch lines being connected to the distal interface (054) of the pressure sensor (005) via a fourth hose (034), and the other branch line being connected to the proximal interface (053) of the pressure sensor (005) via a third hose (033). One end of the parallel main line is connected to the upper end of the feed port of the sodium-potassium alloy tank (002) via a first hose (031).

7. The sodium-potassium alloy filling equipment according to claim 6, characterized in that: The first hose (031) is provided with a first clamping point (311), a second clamping point (312), and a third clamping point (313) in sequence, the third hose (033) is provided with a fifth clamping point (331), the fourth hose (034) is provided with a sixth clamping point (341), and a valve (036) is provided between two adjacent branch pipes on the parallel main pipe (035) for filling the same pressure sensor (005).

8. The sodium-potassium alloy filling equipment according to claim 1, characterized in that: The vacuum buffer tank (006) is provided with an absolute pressure gauge (063), a buffer tank outlet pipe (062), and a buffer tank inlet pipe (061). The buffer tank outlet pipe (062) is connected to the first vacuum pump (003), and the buffer tank inlet pipe (061) is connected to the parallel main line (035).

9. The sodium-potassium alloy filling equipment according to claim 1, characterized in that: The back-pump vacuum pipeline comprises a back-pump main pipe (043), a second back-pump hose (042) and a first back-pump hose (041); the second vacuum pump (004) is connected to one end of the back-pump main pipe (043); the other end of the back-pump main pipe (043) is connected to the first back-pump hose (041) and the second back-pump hose (042) via a connector; wherein the end of the first back-pump hose (041) away from the back-pump main pipe (043) is connected to a proximal back-pump tooling (051); the end of the second back-pump hose (042) away from the back-pump main pipe (043) is connected to a distal back-pump tooling (052); the proximal back-pump tooling (051) and the distal back-pump tooling (052) are respectively sealed and connected to two ends of a pressure sensor (005).

10. The sodium-potassium alloy filling equipment according to claim 1, characterized in that: The first vacuum pump (003) is a molecular vacuum pump, and the second vacuum pump (004) is a common vacuum pump.

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