Liquid phase temperature control device for preparing mercury standard gas

Abstract

The utility model provides a liquid phase temperature control device for preparing mercury standard gas. The liquid phase temperature control device comprises an outer bottle, an inner bottle, a bottle cap, a plurality of inner bottle connectors and a plurality of outer bottle connectors, the outer bottle is provided with a first containing cavity used for containing temperature control liquid. The inner bottle is provided with a second accommodating cavity for accommodating mercury to be detected, and the inner bottle is placed in the first accommodating cavity; the bottle cap is connected to the outer bottle and can seal the first containing cavity, and the bottle cap is connected to the inner bottle and can seal the second containing cavity. The inner bottle connectors are connected to the bottle cap and communicate with the second containing cavity. The outer bottle connectors are connected to the bottle cap and communicate with the first containing cavity. The device disclosed by the utility model has the advantages of good heating performance, good temperature control effect, simplicity in operation, convenience in use, good repeatability and the like, and can generate high-precision and high-accuracy mercury standard gas with preset mass concentration to calibrate and calibrate a gaseous mercury analyzer.

Description

TECHNICAL FIELD

[0001] The utility model relates to environmental monitoring equipment technical field more specifically, relate to a kind of for preparing liquid phase temperature control device of mercury standard gas. BACKGROUND

[0002] Mercury is a kind of heavy metal pollutants, which is toxic and harmful to ecological environment and human health. The gaseous mercury analyzer with high precision and ultra-low detection limit needs to be calibrated and adjusted regularly during use, which requires a gaseous mercury calibration device that can produce high-accuracy mercury standard gas. Some existing gaseous mercury calibration devices usually use saturated mercury vapor method to prepare mercury standard gas. The saturated mercury vapor method has the advantages of high accuracy, traceability and stability, and is a relatively practical and promising method. However, the saturated mercury vapor pressure method is very sensitive to temperature, so it requires very good temperature control effect. The current classic and reliable gaseous mercury calibration source device (such as The temperature in the mercury pool is controlled by the thermal conductivity of the metal, which needs a relatively long time to stabilize. After the temperature is stabilized, a syringe is used to manually extract mercury vapor. During the extraction process, the operation needs to be stable and the injection operation for the instrument to be calibrated needs to be completed in a very short time to prevent the mercury vapor in the syringe from escaping and causing errors. Although this technical solution can complete the calibration of the instrument, there are small differences in the temperature of the mercury pool controlled by the semiconductor. When extracting mercury vapor, different regions may have different mercury vapor concentration, which may cause errors. Finally, the manual injection method requires high skills, has poor reproducibility, and has operational uncertainty. Therefore, the gaseous mercury calibration device using this method has low accuracy. SUMMARY

[0003] (I) Technical problem to be solved

[0004] The technical problem to be solved by the utility model is that the temperature control effect of the existing mercury detection device on mercury vapor is not good, which may affect the accuracy of the final measurement.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0007] The utility model provides a kind of for preparing mercury standard gas liquid phase temperature control device, including outer bottle, inner bottle, bottle cap, multiple inner bottle interfaces and multiple outer bottle interfaces;Outer bottle has first containing cavity for containing temperature control liquid;Inner bottle has second containing cavity for containing to be measured mercury, the inner bottle is placed in the first containing cavity;Bottle cap is connected to the outer bottle and can close the first containing cavity, is connected to the inner bottle and can close the second containing cavity;Multiple inner bottle interfaces are connected to the bottle cap and are communicated with the second containing cavity;Multiple outer bottle interfaces are connected to the bottle cap and are communicated with the first containing cavity.

[0008] Preferably, the inner bottle interface includes an inner bottle temperature measuring interface and a gas extraction interface, and the outer bottle interface includes an outer bottle temperature measuring interface, a liquid inlet interface, and a liquid outlet interface.

[0009] Preferably, a first thermometer is further included, which passes through the inner bottle temperature measuring interface and is arranged in the second containing cavity.

[0010] Preferably, the inner bottle temperature measuring interface includes a threaded stud, a sealing element, and a locking element, the bottle cap is provided with a threaded recess, the threaded stud is threadedly connected with the threaded recess, the threaded stud is provided with a mounting hole for penetrating the first thermometer, the sealing element is arranged between the mounting hole and the first thermometer, and the locking element is threadedly connected with the threaded stud and abuts against the sealing element.

[0011] Preferably, the sealing element includes a sleeve and a silica gel pad, the sleeve is provided with a tapered hole for penetrating the first thermometer, the silica gel pad is provided with a through hole for penetrating the first thermometer, one end of the silica gel pad abuts against the sleeve, and the other end of the silica gel pad abuts against the locking element.

[0012] Preferably, a second thermometer is further included, which passes through the outer bottle temperature measuring interface and is arranged in the first containing cavity.

[0013] Preferably, a heat exchange assembly is further included, an output end of the heat exchange assembly is connected with the liquid inlet interface, and an input end of the heat exchange assembly is connected with the liquid outlet interface.

[0014] Preferably, the inner bottle is threadedly connected with the bottle cap.

[0015] Preferably, the outer bottle is threadedly connected with the bottle cap.

[0016] Preferably, a plurality of vertical ridge protrusions are arranged at intervals on the outer circumferential side of the bottle cap.

[0017] (Three) beneficial effects

[0018] The above technical solution of the utility model has at least the following advantages:

[0019] The utility model discloses a first accommodating cavity of outer bottle is provided with the heat exchange medium that can circulate and flow, produce a heating environment of constant temperature through the heat exchange medium of relatively constant temperature, can carry out high stability temperature control to mercury vapor, and the circulating heat exchange medium can reduce the temperature difference of saturated mercury vapor in different areas in the inner bottle. The utility model discloses the automatic trace metering pump of adaptation, can realize the operation of automatic extraction mercury vapor and injection mercury vapor, avoided the uncertainty of artificial operation. Compared with prior art gaseous mercury calibration device technical scheme, the utility model has the advantages of good heating performance, good temperature control effect, simple operation, convenient to use, good repeatability etc., can produce the high precision, high accuracy mercury standard gas of preset mass concentration, calibrates and calibrates to gaseous mercury analyzer. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be to the drawing needed to use in the embodiment briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0021] Figure 1 It is the structure schematic drawing of liquid phase temperature control device for preparing mercury standard gas provided by the embodiment of the utility model.

[0022] Figure 2 It is the structure explosion drawing of liquid phase temperature control device for preparing mercury standard gas provided by the embodiment of the utility model.

[0023] Figure 3 It is the structure explosion drawing of bottle cap, inner bottle interface and outer bottle interface provided by the embodiment of the utility model.

[0024] Figure 4 It is the structure explosion drawing of inner bottle temperature measuring interface provided by the embodiment of the utility model.

[0025] Figure 5 It is the structure schematic drawing of bottle cap provided by the embodiment of the utility model.

[0026] The reference numerals in the drawing are as follows:

[0027] 1, outer bottle;2, inner bottle;3, bottle cap;4, inner bottle temperature measuring interface;5, gas extraction interface;6, outer bottle temperature measuring interface;7, liquid inlet interface;8, liquid outlet interface;11, first accommodating cavity;21, second accommodating cavity;31, thread groove;32, vertical thread protrusion;33, outer bottle threaded connection section;34, inner bottle threaded connection section;41, stud;42, sealing element;43, locking element;411, mounting hole;421, clamping sleeve;422, silica gel pad;4211, tapered hole. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and should not be understood as indicating relative importance or indicating the number of technical features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited. The specific implementation of the present application will be described in more detail below in combination with specific embodiments:

[0032] As shown in Figures 1 to 5 The present application embodiment provides a liquid phase temperature control device for preparing mercury standard gas, which comprises an outer bottle 1, an inner bottle 2, a bottle cap 3, a plurality of inner bottle interfaces and a plurality of outer bottle interfaces. The outer bottle 1 has a first containing cavity 11 for containing temperature control liquid. The inner bottle 2 has a second containing cavity 21 for containing mercury to be measured, and the inner bottle 2 is placed in the first containing cavity 11. The bottle cap 3 is connected to the outer bottle 1 and can close the first containing cavity 11, and is connected to the inner bottle 2 and can close the second containing cavity 21. The plurality of inner bottle interfaces are connected to the bottle cap 3 and are in communication with the second containing cavity 21. The plurality of outer bottle interfaces are connected to the bottle cap 3 and are in communication with the first containing cavity 11. Specifically, in the present embodiment, the outer bottle 1, the inner bottle 2 and the bottle cap 3 are preferably Teflon material.

[0033] As one of the optional embodiments of the present embodiment, the inner bottle interface comprises an inner bottle temperature measuring interface 4 and a gas extraction interface 5, and the outer bottle interface comprises an outer bottle temperature measuring interface 6, a liquid inlet interface 7 and a liquid outlet interface 8.

[0034] As one of the optional embodiments of the present embodiment, a first thermometer is further included, which passes through the inner bottle temperature measuring interface 4 and is arranged in the second accommodating cavity 21.

[0035] As one of the optional embodiments of the present embodiment, the inner bottle temperature measuring interface 4 includes a threaded stud 41, a sealing member 42 and a locking member 43. A threaded groove 31 is formed on the bottle cap 3, the threaded stud 41 is threadedly connected with the threaded groove 31, the threaded stud 41 is provided with a mounting hole 411 for passing the first thermometer (not shown), the sealing member 42 is arranged between the mounting hole 411 and the first thermometer, that is, the first thermometer passes through the hole of the sealing member 42 arranged in the mounting hole 411, and the locking member 43 is threadedly connected with the threaded stud 41 and abuts against the sealing member 42. Specifically, the threaded stud 41 is threadedly connected with the threaded groove 31 to achieve the fixed installation of the inner bottle temperature measuring interface 4. The locking member 43 can lock and fix the sealing member 42.

[0036] As one of the optional embodiments of the present embodiment, the sealing member 42 includes a sleeve 421 and a silica gel pad 422. The sleeve 421 is provided with a tapered hole 4211 for passing the first thermometer, and the silica gel pad 422 is provided with a through hole for passing the first thermometer. One end of the silica gel pad 422 abuts against the sleeve 421, and the other end of the silica gel pad 422 abuts against the locking member 43. Specifically, the sleeve 421 can support and fix the lower end of the first thermometer to prevent the first thermometer from falling into the second accommodating cavity 21 during use. Specifically, in the present embodiment, the silica gel pad functions to cover the hole above the sleeve 421 to achieve the sealing of the sleeve 421, which can avoid the escape of mercury vapor in the second accommodating cavity 21 from the hole above the sleeve 421 during use. Specifically, the silica gel pad 422 has a certain material elasticity, and the diameter of the through hole of the silica gel pad 422 should be slightly smaller than the diameter of the first thermometer, so that when the first thermometer passes through the through hole, the inner wall of the through hole of the silica gel pad 422 can tightly abut against the outer circumferential side of the first thermometer to achieve the sealing effect.

[0037] As one of the optional embodiments of the present embodiment, a second thermometer is further included, which passes through the outer bottle temperature measuring interface 6 and is arranged in the first accommodating cavity 11. Specifically, the outer bottle temperature measuring interface 6 for installing the second thermometer has the same structure as the inner bottle temperature measuring interface. Specifically, the outer bottle temperature measuring interface 6 has the same structure as the inner bottle temperature measuring interface 4, and no silica gel pad 422 is arranged therein.

[0038] As one of the optional embodiments of the embodiment, a heat exchange assembly (not shown) is further included, an output end of the heat exchange assembly is connected to the liquid inlet interface 7, and an input end of the heat exchange assembly is connected to the liquid outlet interface 8. The heat exchange assembly is used to output a heat exchange medium with a preset temperature, so as to realize heating of the mercury to be measured. Specifically, the heat exchange assembly can heat or cool the heat exchange medium according to the set temperature, so that the circulating heat exchange medium is in a relatively constant temperature range.

[0039] As one of the optional embodiments of the embodiment, as shown in Figure 5 Specifically, the bottle cap 3 is provided with an inner bottle threaded connection section 34, and a threaded section at a bottle mouth of the inner bottle 2 is threadedly connected with the inner bottle threaded connection section 34, so as to realize sealing of the second containing cavity 21. Meanwhile, the threaded connection can realize a better sealing effect and is convenient for dismounting and mounting.

[0040] As one of the optional embodiments of the embodiment, the outer bottle 1 is threadedly connected with the bottle cap 3. Specifically, the bottle cap 3 is provided with an outer bottle threaded connection section 33, and a threaded section at a bottle mouth of the outer bottle 1 is threadedly connected with the outer bottle threaded connection section 33, so as to realize sealing of the first containing cavity 11. Meanwhile, the threaded connection can realize a better sealing effect and is convenient for dismounting and mounting.

[0041] As one of the optional embodiments of the embodiment, a plurality of vertical ridge protrusions 32 are arranged at intervals on an outer periphery side of the bottle cap 3. The vertical ridge protrusions 32 have an anti-skid effect, and a hand of a person is not easy to slide when the bottle cap 3 is twisted. The outer bottle 1, the inner bottle 2 and the bottle cap 3 can be better tightened, so as to ensure that the outer bottle 1 does not leak liquid and the inner bottle 2 does not leak gas and liquid.

[0042] The specific use principle of the utility model is as follows:

[0043] First, the to-be-tested mercury is placed in the second containing cavity of the inner bottle, and after the placement is completed, the inner bottle and the bottle cap are screwed tightly to close the second containing cavity; next, the inner bottle is placed in the first containing cavity, and a heat exchange medium is added in the first containing cavity between the inner bottle and the outer bottle, and the addition height of the heat exchange medium is approximately flush with the bottle mouth of the outer bottle, next, the outer bottle and the bottle cap are connected and screwed tightly, and the first containing cavity is closed. The liquid inlet interface is connected with the output end of the heat exchange assembly through a hose, the liquid outlet interface is connected with the input end of the heat exchange assembly through a hose, the heat exchange assembly is started, the heat exchange assembly delivers the heat exchange medium with a preset temperature from the output end to the first containing cavity through the liquid inlet interface, and then flows out from the liquid outlet interface and returns to the heat exchange assembly through the input end, and the circulation is continuously performed to ensure that the temperature of the heat exchange medium is stable, the temperature of the heat exchange medium in the second containing cavity can be monitored through the second thermometer arranged in the temperature measuring interface of the outer bottle, and the temperature of the to-be-tested mercury in the first containing cavity can be monitored through the first thermometer arranged in the temperature measuring interface 4 of the inner bottle. The value of the first thermometer is observed, when the temperature of the to-be-tested mercury reaches the required temperature, the saturated mercury vapor pressure in the inner bottle reaches a constant state, and the mass concentration also remains constant, the to-be-tested mercury in the vapor state is extracted by inserting the air extraction assembly from the air extraction interface 5 into the second containing cavity, and the extracted to-be-tested mercury is injected into the mercury analyzer for calibration. Specifically, the air extraction assembly includes but is not limited to a high-precision syringe and an automatic micro-metering pump.

[0044] The test results of the liquid phase temperature control device for preparing mercury standard gas provided by the patent application are shown in Table 1. 10 μl of saturated mercury vapor is extracted five times continuously at a set temperature of 20℃, 21℃ and 22℃ respectively, and the real-time temperature of the mercury source in the inner bottle and the mercury vapor mass detected by the gaseous mercury analyzer are recorded. The temperature fluctuation range is within 0.03℃, and the maximum error of the detected mercury vapor mass is within 3%, which indicates that the device of the patent application can control the temperature with high precision and generate stable mercury standard gas.

[0045]

[0046]

[0047] Table 1

[0048] The above only describes the preferred embodiments of the utility model and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A liquid phase temperature control device for preparing mercury standard gas, characterized in that, The application relates to a temperature control device for mercury, which comprises the following parts: an outer bottle with a first containing cavity for containing temperature control liquid; an inner bottle with a second containing cavity for containing mercury to be tested, which is placed in the first containing cavity; a bottle cap connected to the outer bottle and capable of sealing the first containing cavity, and connected to the inner bottle and capable of sealing the second containing cavity; a plurality of inner bottle interfaces connected to the bottle cap and communicating with the second containing cavity; a plurality of outer bottle interfaces connected to the bottle cap and communicating with the first containing cavity.

2. The liquid phase temperature control device for preparing mercury standard gas according to claim 1, wherein, The inner bottle interfaces comprise inner bottle temperature measuring interfaces and air extraction interfaces, and the outer bottle interfaces comprise outer bottle temperature measuring interfaces, liquid inlet interfaces and liquid outlet interfaces.

3. The liquid phase temperature control device for preparing mercury standard gas according to claim 2, wherein, The device further comprises a first thermometer which passes through the inner bottle temperature measuring interfaces and is arranged in the second containing cavity.

4. The liquid phase temperature control device for preparing mercury standard gas according to claim 3, wherein, The inner bottle temperature measuring interfaces comprise studs, sealing members and locking members, the bottle cap is provided with threaded grooves, the studs are threadedly connected with the threaded grooves, the studs are provided with mounting holes for penetrating the first thermometer, the sealing members are arranged between the mounting holes and the first thermometer, and the locking members are threadedly connected with the studs and abut against the sealing members.

5. The liquid phase temperature control device for preparing mercury standard gas according to claim 4, wherein, The sealing members comprise clamping sleeves and silica gel pads, the clamping sleeves are provided with tapered holes for penetrating the first thermometer, the silica gel pads are provided with through holes for penetrating the first thermometer, one end of the silica gel pad abuts against the clamping sleeve, and the other end of the silica gel pad abuts against the locking member.

6. The liquid phase temperature control device for preparing mercury standard gas according to claim 2, wherein The device further comprises a second thermometer which passes through the outer bottle temperature measuring interfaces and is arranged in the first containing cavity.

7. The liquid phase temperature control device for preparing mercury standard gas according to claim 2, wherein The device further comprises a heat exchange assembly, an output end of the heat exchange assembly is connected with the liquid inlet interfaces, and an input end of the heat exchange assembly is connected with the liquid outlet interfaces.

8. The liquid phase temperature control device for preparing mercury standard gas according to claim 1, wherein, The inner bottle is threadedly connected with the bottle cap.

9. The liquid phase temperature control device for preparing mercury standard gas according to claim 1, wherein, The outer bottle is threadedly connected with the bottle cap.

10. The liquid phase temperature control device for preparing mercury standard gas according to claim 1, wherein, A plurality of vertical raised lines are arranged on the outer periphery of the bottle cap.

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