Nitrogen compensation closed-loop circulation type constant-temperature saturated mercury vapor generator
By designing a nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator, the leakage risk and concentration instability problems of traditional mercury vapor generators have been solved, realizing a safe and convenient supply of low-frequency trace mercury vapor, reducing the cost of use and the difficulty of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- EARTHQUAKE ADMINISTRATION OF BEIJING MUNICIPALITY
- Filing Date
- 2026-03-19
- Publication Date
- 2026-05-08
AI Technical Summary
Traditional open-circuit purging mercury vapor generators have potential leakage risks due to multiple gas path interfaces, continuous consumption of high-purity gas, and high operating costs. The concentration of the simple static mercury bottle cannot be kept stable and negative pressure is formed after multiple samplings, making operation difficult and unsafe.
A nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator is designed. It adopts a closed structure and adjustable fixing measures. Through closed-loop circulation and intelligent nitrogen compensation technology, it forms an integrated, self-contained, zero-leakage system. It utilizes components such as a micro-circulation pump, a two-way pressure balancing valve group, a micro-differential pressure transmitter, and an aluminum foil nitrogen bag to achieve low-speed gas circulation and pressure balance.
It provides a safe, convenient, accurate, and stable saturated mercury vapor source, eliminating the need for an external gas source, reducing operating costs, and ensuring operational safety and concentration stability.
Smart Images
Figure CN121993779A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of analytical instrument calibration and environmental monitoring technology, specifically to a nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator. Background Technology
[0002] Traditional open-circuit purging generators require an external high-pressure nitrogen cylinder to continuously purge a mercury cylinder with carrier gas to generate saturated vapor. This system is not portable, has potential leakage risks due to multiple gas interface points, and continuously consumes high-purity gas, resulting in high operating costs. It is mainly suitable for stationary laboratories.
[0003] The simple static mercury bottle is just a sealed mercury bottle with a constant temperature. When sampling, the vapor inside the bottle is directly extracted. Each sampling causes a drop in pressure and a decrease in vapor concentration inside the bottle, making it impossible to maintain a stable concentration. Moreover, after multiple samplings, a negative pressure is formed, making the operation difficult and unsafe.
[0004] All of the above methods may lead to leakage of highly toxic mercury vapor due to improper operation or poor equipment sealing, posing a threat to human health and the environment. Summary of the Invention
[0005] The purpose of this invention is to provide a nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator, which solves the problems of potential leakage risks caused by multiple gas circuit interfaces in traditional open-loop purging generators, continuous consumption of high-purity gas, high operating costs, inability to maintain stable concentration in simple static mercury cylinders, negative pressure formation after multiple sampling, and difficult and unsafe operation.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] A nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator includes an openable external housing, an internal panel, a water bath, a mercury cylinder, and a control device. The openable external housing surrounds the mercury vapor generator. Inside the openable external housing is the internal panel, which is secured by cover bolts. A sealing partition is located at the bottom of the internal panel. The water bath is located in the space to the left of the sealing partition, and the mercury cylinder is located inside the water bath. The control device is located in the space to the right of the sealing partition.
[0008] The mercury bottle includes a fixing frame, a stainless steel fixing ring, a bottle body, and a bottle cap. The fixing frame is screwed to the inside of the water bath. The fixing frame is provided with the surrounding stainless steel fixing ring. The stainless steel fixing ring is provided with a hand-adjustable fastening nut. The inside of the stainless steel fixing ring is adjusted and locked to the bottle body by the hand-adjustable fastening nut. The bottle body is provided with the bottle cap. From left to right, a microcirculation air outlet tube, an air intake tube, and a microcirculation air inlet tube are respectively inserted into the upper part of the bottle cap.
[0009] The control device includes a micro-circulation pump, a bidirectional pressure balancing valve group, a micro-differential pressure transmitter, an aluminum foil nitrogen bag, and an activated carbon adsorption tank. The other end of the micro-circulation inlet pipe is connected to the micro-circulation pump. The other end of the micro-circulation pump is connected to the right connection port one of the bidirectional pressure balancing valve group via a three-way valve one. The third port of the three-way valve one is connected to a three-way valve two. The other end of the three-way valve two is connected to the right connection port two of the bidirectional pressure balancing valve group. The third port of the three-way valve two is connected to the micro-differential pressure transmitter. The other port of the micro-differential pressure transmitter is connected to the micro-circulation outlet pipe. The left connection port three of the bidirectional pressure balancing valve group is connected to the aluminum foil nitrogen bag. The left connection port four of the bidirectional pressure balancing valve group is connected to the activated carbon adsorption tank.
[0010] Furthermore, the openable external housing includes a shell, an upper carrying handle, a side carrying handle, a buckle, and a power socket. The upper carrying handle is located on the upper part of the shell, and the side carrying handles are located on both sides of the shell. The upper cover of the shell is rotatably fixed to the lower housing. The front of the cover and the housing are provided with buckles, and the right side of the shell is provided with a power socket.
[0011] Furthermore, the inner panel of the chamber includes a display screen, a water bath temperature control button, a sampling port, a micro-circulation pump switch, a main power knob, and cover plate fixing bolts. The display screen is embedded in the upper left corner of the inner panel, the water bath temperature control button is located to the right of the display screen, the sampling port is located below the display screen, the micro-circulation pump switch is located to the right of the sampling port, and the main power knob is located to the right of the micro-circulation pump switch. The sampling port is connected to the gas extraction tube, and the inner panel of the chamber is fixed to the openable outer chamber by the cover plate fixing bolts.
[0012] Furthermore, the bottle body is a high borosilicate glass bottle, the bottle cap is an integrally molded frosted glass cap, and a frosted sealing opening is provided between the high borosilicate glass bottle and the integrally molded frosted glass cap.
[0013] Furthermore, the control device is also equipped with a power supply and a counterweight. The power supply is electrically connected to the micro-circulation pump, the bidirectional pressure balance valve group, and the micro-differential pressure transmitter. The counterweight is located in the space on the right side of the sealing partition.
[0014] Furthermore, the water bath includes a pot body and a pot lid. Several fixing posts are provided on the inner wall of the left side space of the sealing partition. The pot body is engaged with the space inside the fixing posts, and the size of the inner space of the fixing posts matches the size of the pot body. The pot lid covers the upper part of the pot body. Several lid fixing bolts are provided on the edge of the pot lid, and the lid fixing bolts are screwed to the fixing posts. The pot lid is provided with a water bath cover plate and a pressure relief hole. The pot lid is provided with three pagoda connectors for transmitting gas through the annular gas outlet pipe, the gas intake pipe, and the micro-circulation gas inlet pipe.
[0015] An adjustable mercury bottle fixing rod is provided on the lower surface of the pot lid above the bottle cap, and a metal base pad is screwed onto the adjustable mercury bottle fixing rod.
[0016] Furthermore, the connecting pipes used to connect the microcirculation outlet pipe, the microcirculation intake pipe, the microcirculation pump, the bidirectional pressure balance valve group, the activated carbon adsorption tank, the aluminum foil nitrogen bag, and the micro differential pressure transmitter are polytetrafluoroethylene (PTFE) pipes.
[0017] Furthermore, the bottom of the inner wall of the bottle is provided with a high borosilicate sand core filter plate.
[0018] The beneficial effects of this invention are as follows: This application forms an integrated, self-contained, zero-leakage saturated mercury vapor generator through a closed structural design and adjustable fixing measures. Without the need for an external gas source, it provides a safe, convenient, accurate and stable saturated mercury vapor source for low-frequency, micro-volume instrument calibration work through closed-loop circulation and intelligent nitrogen compensation technology.
[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure when opened, as shown in an embodiment of the present invention.
[0021] Figure 2 This is a schematic diagram of the overall structure when closed, as shown in an embodiment of the present invention.
[0022] Figure 3 This is a schematic diagram of the overall elevation structure according to an embodiment of the present invention.
[0023] Figure 4 This is a partial structural schematic diagram of component 4 according to an embodiment of the present invention.
[0024] Figure 5 This is a schematic diagram of the overall planar structure according to an embodiment of the present invention.
[0025] Figure 6 This is a schematic diagram of the overall system flow according to an embodiment of the present invention.
[0026] Explanation of reference numerals in the attached diagram: 1. Openable external chamber; 2. Internal panel; 3. Water bath; 4. Mercury bottle; 5. Control device; 10. Shell; 11. Top carrying handle; 12. Side carrying handle; 13. Buckle; 14. Power socket; 20. Display screen; 21. Water bath temperature control button; 22. Sampling port; 23. Micro-circulation pump switch; 24. Main power knob; 25. Cover plate fixing bolts; 30. Bath body; 31. Bath lid; 32. Fixing column; 33. Pressure relief hole in the water bath cover; 34. Adjustable mercury bottle fixing top. 35. Rod; 36. Metal base pad; 47. Pagoda connector; 48. Fixing bracket; 49. Stainless steel fixing ring; 40. Bottle body; 41. Bottle cap; 42. Manually adjustable fastening nut; 43. Microcirculation outlet pipe; 44. Gas intake pipe; 45. Microcirculation inlet pipe; 46. High borosilicate sand core filter plate; 57. Microcirculation pump; 58. Two-way pressure balance valve assembly; 59. Micro differential pressure transmitter; 50. Aluminum foil nitrogen bag; 51. Activated carbon adsorption tank; 52. Three-way valve one; 53. Three-way valve two; 54. Power supply; 55. Counterweight. Detailed Implementation
[0027] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.
[0030] Please see Figure 1 A preferred embodiment of this application shows a nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator, comprising an openable external housing 1, an inner panel 2, a water bath 3, a mercury cylinder 4, and a control device 5. The mercury vapor generator is externally provided with the openable external housing 1. Inside the openable external housing 1 is the inner panel 2, which is fixed by cover bolts. A sealing partition is provided at the lower part of the inner panel 2. The water bath 3 is located in the space to the left of the sealing partition, and the mercury cylinder 4 is located inside the water bath 3. The control device 5 is located in the space to the right of the sealing partition.
[0031] The mercury bottle 4 includes a fixing frame 40, a stainless steel fixing ring 41, a bottle body 42, and a bottle cap 43. The fixing frame 40 is screwed into the inside of the water bath 3. The fixing frame 40 is provided with a surrounding stainless steel fixing ring 41. The stainless steel fixing ring 41 is provided with a hand-adjustable fastening nut 44. The inside of the stainless steel fixing ring 41 is adjusted and locked into the bottle body 42 by the hand-adjustable fastening nut 44. The bottle body 42 is provided with a bottle cap 43. From left to right, a micro-circulation air outlet pipe 45, an air intake pipe 46, and a micro-circulation air inlet pipe 47 are respectively inserted into the upper part of the bottle cap 43.
[0032] The control device 5 includes a micro-circulation pump 50, a bidirectional pressure balancing valve group 51, a micro-differential pressure transmitter 52, an aluminum foil nitrogen bag 53, and an activated carbon adsorption tank 54. The other end of the micro-circulation inlet pipe 47 is connected to the micro-circulation pump 50. The other end of the micro-circulation pump 50 is connected to the right connection port 1 of the bidirectional pressure balancing valve group 51 through a three-way valve 1 55. The third port of the three-way valve 1 55 is connected to a three-way valve 2 56. The other end of the three-way valve 2 56 is connected to the right connection port 2 of the bidirectional pressure balancing valve group 51. The third port of the three-way valve 2 56 is connected to the micro-differential pressure transmitter 52. The other port of the micro-differential pressure transmitter 52 is connected to the micro-circulation outlet pipe 45. The left connection port 3 of the bidirectional pressure balancing valve group 51 is connected to the aluminum foil nitrogen bag 53. The left connection port 4 of the bidirectional pressure balancing valve group 51 is connected to the activated carbon adsorption tank 54.
[0033] The openable external housing 1 includes a housing 10, an upper carrying ring 11, a side carrying ring 12, a buckle 13, and a power socket 14. The upper carrying ring 11 is provided on the upper part of the housing 10, and the side carrying rings 12 are provided on both sides of the housing 10. The upper cover of the housing 10 is rotatably fixed to the lower housing. The buckle 13 is provided on the front of the cover and the housing. The power socket 14 is provided on the right side of the housing 10.
[0034] The inner panel 2 includes a display screen 20, a water bath temperature control button 21, a sampling port 22, a micro-circulation pump switch 23, a main power knob 24, and cover plate fixing bolts 25. The display screen 20 is embedded in the upper left corner of the inner panel 2. The water bath temperature control button 21 is located on the right side of the display screen 20. The sampling port 22 is located on the lower side of the display screen 20. The micro-circulation pump switch 23 is located on the right side of the sampling port 22. The main power knob 24 is located on the right side of the micro-circulation pump switch 23. The sampling port 22 is connected to the gas extraction pipe 46. The inner panel 2 is fixed to the openable outer box 1 by the cover plate fixing bolts 25.
[0035] The bottle body 42 is a high borosilicate glass bottle, and the bottle cap 43 is an integrally molded frosted glass cap. A frosted sealing opening is provided between the high borosilicate glass bottle and the integrally molded frosted glass cap.
[0036] The control device 5 is also equipped with a power supply 57 and a counterweight 58. The power supply 57 is electrically connected to the micro-circulation pump 50, the bidirectional pressure balance valve group 51, and the micro differential pressure transmitter 52. The counterweight 58 is located in the space on the right side of the sealed partition.
[0037] The water bath 3 includes a pot body 30, a pot lid 31, and a pagoda connector 36. Several fixing posts 32 are provided on the inner wall of the left side space of the sealing partition. The pot body 30 is fitted into the space inside the fixing posts 32, and the size of the inner space of the fixing posts 32 matches that of the pot body 30. The pot body 30 is covered by the pot lid 31. Several lid fixing bolts are provided on the edge of the pot lid 31, and the lid fixing bolts are screwed to the fixing posts 32. The pot lid 31 is provided with a water bath cover plate and a pressure relief hole 33. The pot lid 31 is provided with three gas supply pipes 45, gas intake pipes 46, and micro-circulation gas intake pipes 47 for transmitting gas via the pagoda connector 36.
[0038] An adjustable mercury bottle fixing rod 34 is provided on the lower surface of the pot lid 31 above the bottle cap 43, and a metal base pad 35 is screwed onto the adjustable mercury bottle fixing rod 34.
[0039] The connecting pipes used to connect the microcirculation outlet pipe 45, the intake pipe 46, the microcirculation inlet pipe 47, the microcirculation pump 50, the bidirectional pressure balance valve group 51, the activated carbon adsorption tank 54, the aluminum foil nitrogen bag 53, and the micro differential pressure transmitter 52 are polytetrafluoroethylene pipes.
[0040] The bottom of the inner wall of the bottle body 42 is equipped with a high borosilicate sand core filter plate 48. This design can use a very small amount of mercury to form a huge evaporation surface area on the high borosilicate sand core filter plate 48, ensuring rapid gas-liquid equilibrium.
[0041] All pipes and interfaces that come into contact with mercury vapor are made of polytetrafluoroethylene (PTFE) to prevent adsorption and penetration.
[0042] A miniature diaphragm pump with a full PTFE flow path is used to drive low-speed gas circulation within the system, ensuring uniform concentration. Sampling port 22 is equipped with a puncture-resistant self-sealing silicone / PTFE composite septum as the sampling port, specifically designed for airtight syringe needles.
[0043] The micro differential pressure transmitter 52 contains a micro differential pressure sensor that monitors the small pressure difference between the system's internal components and the external atmosphere in real time, with a range of ±50 mbar.
[0044] When the system negative pressure exceeds a set threshold (e.g., 1-2 mbar due to sampling), the two-way pressure balancing valve group 51 opens to replenish high-purity nitrogen from the built-in small nitrogen bag until the pressure is restored.
[0045] When the system experiences abnormal positive pressure (such as due to temperature fluctuations), the valve opens to the other side, allowing the gas to pass through the activated carbon adsorption tank 54 containing sulfur-impregnated activated carbon before being discharged, ensuring absolute safety.
[0046] The aluminum foil nitrogen bag 53 uses a medical-grade aluminum foil composite bag with an initial volume of 100-200mL, pre-filled with high-purity nitrogen. It can support thousands of micro-sampling operations and can be modularly replaced when depleted.
[0047] The water bath cover is equipped with a pressure relief hole, which also serves as a water inlet and an air vent.
[0048] After power-on, the thermostatic system operates, the circulation pump starts, and the system establishes a stable saturated mercury vapor concentration (Csat) within 2-4 hours. 2. The system maintains low-speed circulation, the display shows "Ready," and the pressure is monitored in real time. The user draws the required volume (0.02-0.1 mL) from the sampling port using a syringe. The micro-pressure sensor detects the small pressure drop caused by sampling. The nitrogen compensation mechanism is triggered only when the pressure drop exceeds a set threshold, replenishing an equal amount of nitrogen. For most micro-sampling, the system may not require gas replenishment, as the rapid evaporation of mercury can maintain concentration and pressure balance.
[0049] Safety precautions: Any abnormal positive pressure (such as misoperation or temperature rise) will trigger the gas-guided adsorption tank to safely discharge the gas and prevent leakage.
[0050] The space between the water bath and the outer wall is filled with a closed-cell insulation material of about 2cm thickness to achieve temperature stability and energy saving, and to prevent the outer shell from burning the user.
[0051] By monitoring pressure in real time, inert gas is replenished from the built-in nitrogen bag only when necessary, and the gas is safely filtered and discharged in case of abnormal positive pressure, thereby maintaining a stable concentration while absolutely preventing air ingress and mercury vapor leakage.
[0052] Example of design parameters:
[0053] Mercury bottle volume: 2 L
[0054] Mercury dosage: 10-20 g
[0055] Constant temperature accuracy: ±0.1 ℃
[0056] Circulation pump flow rate: 10-100 mL / min
[0057] Single sample volume: 0.02 - 0.1 mL
[0058] Pressure compensation trigger threshold: 1 mbar
[0059] Initial volume of nitrogen bag: 100 mL
[0060] Outer insulation layer thickness: 20 mm
[0061] When using:
[0062] 1. Place the equipment in a laboratory fume hood or a well-ventilated area and connect it to a power source.
[0063] 2. Power on. Set the temperature to the desired calibration point (e.g., 24.0°C) via the panel. The equipment will automatically begin temperature control and circulation.
[0064] 3. Wait for equilibrium: After about 2-3 hours, the display screen will indicate "Concentration ready".
[0065] 4. Calibration: Insert the sampling needle (or via syringe adapter) of the instrument to be calibrated into the sampling septum of the device, and draw gas for calibration according to the instrument requirements. Multiple micro-sampling operations can be performed continuously (e.g., ≤50 times). 5. Completion: After calibration, turn off the device. The device is ready for the next task at any time.
[0066] In summary, this invention provides a nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator. Through its closed structural design and adjustable fixing measures, this device forms an integrated, self-contained, and zero-leakage saturated mercury vapor generator. Without the need for an external gas source, it provides a safe, convenient, accurate, and stable saturated mercury vapor source for low-frequency, low-volume instrument calibration work through closed-loop circulation and intelligent nitrogen compensation technology.
[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0068] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator, characterized in that, The device includes an openable external housing (1), an inner panel (2), a water bath (3), a mercury bottle (4), and a control device (5). The mercury vapor generator is equipped with the openable external housing (1) on its exterior. The inner panel (2) is fixed inside the openable external housing (1) by a cover plate fixing bolt. A sealing partition is provided at the bottom of the inner panel (2). The water bath (3) is located in the space on the left side of the sealing partition. The mercury bottle (4) is located inside the water bath (3). The control device (5) is located in the space on the right side of the sealing partition. The mercury bottle (4) includes a fixing frame (40), a stainless steel fixing ring (41), a bottle body (42), and a bottle cap (43). The fixing frame (40) is screwed into the inside of the water bath (3). The fixing frame (40) is provided with the surrounding stainless steel fixing ring (41). The stainless steel fixing ring (41) is provided with a hand-adjustable fastening nut (44). The inside of the stainless steel fixing ring (41) is adjusted and locked to the bottle body (42) by the hand-adjustable fastening nut (44). The bottle body (42) is provided with the bottle cap (43). The upper part of the bottle cap (43) has a micro-circulation air outlet pipe (45), an air intake pipe (46), and a micro-circulation air inlet pipe (47) inserted from left to right. The control device (5) includes a micro-circulation pump (50), a bidirectional pressure balance valve group (51), a micro differential pressure transmitter (52), an aluminum foil nitrogen bag (53), and an activated carbon adsorption tank (54). The other end of the micro-circulation inlet pipe (47) is connected to the micro-circulation pump (50). The other end of the micro-circulation pump (50) is connected to the right side connection port of the bidirectional pressure balance valve group (51) through a three-way valve (55). The third port of the three-way valve (55) is connected to a three-way valve (56). The other end of the three-way valve (56) is connected to the right connection port 2 of the bidirectional pressure balance valve group (51). The third port of the three-way valve (56) is connected to the micro differential pressure transmitter (52). The other port of the micro differential pressure transmitter (52) is connected to the micro circulation outlet pipe (45). The left connection port 3 of the bidirectional pressure balance valve group (51) is connected to the aluminum foil nitrogen bag (53). The left connection port 4 of the bidirectional pressure balance valve group (51) is connected to the activated carbon adsorption tank (54).
2. The nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator as described in claim 1, characterized in that, The openable external housing (1) includes a housing (10), an upper carrying ring (11), a side carrying ring (12), a buckle (13), and a power socket (14). The upper carrying ring (11) is provided on the upper part of the housing (10), and the side carrying rings (12) are provided on both sides of the housing (10). The upper cover of the housing (10) is rotatably fixed on the lower housing. The front of the cover and the housing is provided with a buckle (13), and the right side of the housing (10) is provided with a power socket (14).
3. The nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator as described in claim 1, characterized in that, The inner panel (2) of the box includes a display screen (20), a water bath temperature control button (21), a sampling port (22), a micro circulation pump switch (23), a main power knob (24), and a cover plate fixing bolt (25). The display screen (20) is embedded in the upper left corner of the inner panel (2). The water bath temperature control button (21) is located on the right side of the display screen (20). The sampling port (22) is located on the lower side of the display screen (20). The micro circulation pump switch (23) is located on the right side of the sampling port (22). The main power knob (24) is located on the right side of the micro circulation pump switch (23). The sampling port (22) is connected to the gas extraction pipe (46). The inner panel (2) of the box is fixed to the openable outer box (1) by the cover plate fixing bolt (25).
4. The nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator as described in claim 1, characterized in that, The bottle body (42) is a high borosilicate glass bottle, and the bottle cap (43) is an integrally molded frosted glass cap. A frosted sealing opening is provided between the high borosilicate glass bottle and the integrally molded frosted glass cap.
5. A nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator as described in claim 1, characterized in that, The control device (5) is also equipped with a power supply (57) and a counterweight (58). The power supply (57) is electrically connected to the micro-circulation pump (50), the bidirectional pressure balance valve group (51), and the micro differential pressure transmitter (52). The counterweight (58) is located in the space on the right side of the sealing partition.
6. A nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator as described in claim 1, characterized in that, The water bath (3) includes a pot body (30), a pot lid (31), and a pagoda connector (36). Several fixing posts (32) are provided on the inner wall of the left side space of the sealing partition. The pot body (30) is engaged in the space inside the fixing posts (32). The inner space of the fixing posts (32) matches the size of the pot body (30). The pot body (30) is covered with the pot lid (31) on the upper part. Several lid fixing bolts are provided on the edge of the pot lid (31). The lid fixing bolts are screwed to the fixing posts (32). The pot lid (31) is provided with a water bath cover plate with pressure relief holes (33). The pot lid (31) is provided with three pagoda connectors (36) for transmitting gas through the annular gas outlet pipe (45), the gas intake pipe (46), and the micro-circulation gas inlet pipe (47). An adjustable mercury bottle fixing rod (34) is provided on the lower surface of the pot lid (31) above the bottle cap (43), and a metal base pad (35) is screwed onto the adjustable mercury bottle fixing rod (34).
7. A nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator as described in claim 1, characterized in that, The connecting pipe used to connect the microcirculation outlet pipe (45), the air intake pipe (46), the microcirculation inlet pipe (47), the microcirculation pump (50), the bidirectional pressure balance valve group (51), the activated carbon adsorption tank (54), the aluminum foil nitrogen bag (53), and the micro differential pressure transmitter (52) is a polytetrafluoroethylene pipe (37).
8. A nitrogen-compensated closed-loop constant-temperature saturated mercury vapor generator as described in claim 1, characterized in that, The bottom of the inner wall of the bottle body (42) is provided with a high borosilicate sand core filter plate (48).