Mixer for flow injection instrument

Abstract

The invention discloses a mixer for a flow injector, and relates to the technical field of flow injectors, the mixer comprises a mixing unit, a gas inlet unit and a heated self-opening unit, the mixing unit comprises a mixing box and a feeding box; a first mixing chamber, a second mixing chamber and a discharging chamber are sequentially arranged in the mixing box, and the first mixing chamber is communicated with the feeding box; a first sealing circular plate is slidably arranged at the bottom of the feeding box; a second sealing circular plate is rotationally arranged at the bottom of the mixing box, a stirrer is arranged on the second sealing circular plate, and the stirrer is connected with the first sealing circular plate through an elastic telescopic rod; the gas inlet unit comprises a plurality of gas inlet pipes arranged on the mixing box; and the heated self-opening unit is enclosed to form the side wall of the first mixing chamber. A liquid mixture formed after a sample and a current-carrying liquid are injected into the feeding box can be gradually mixed in the feeding box, the first mixing chamber and the second mixing chamber in sequence, and the mixed liquid mixture finally flows into the discharging chamber and then is conveyed to the detector through the discharging pipe to be detected.

Description

Technical Field

[0001] The invention relates to the technical field of flow injection apparatus, in particular to a mixer used for a flow injection apparatus. Background Art

[0002] Flow Injection Analysis (FIA) refers to an analytical instrument designed based on the concept of flow injection proposed by J. Ruzicka and EH. Hansen of the Technical University of Denmark. According to the continuous flow method, the pump tubes of different diameters are compressed by a peristaltic pump, and the reaction reagents and the sample to be tested are proportionally injected into a closed, continuous flow carrier. A color reaction occurs in the chemical reaction unit, and its signal value is measured in the detector. The concentration of the sample to be tested is determined according to the standard curve method. In soil analysis, it is mainly used to determine soil ammonium nitrogen, nitrate nitrogen, nitrite nitrogen, etc.; in water quality analysis, it is mainly used to determine water quality ammonium nitrogen, nitrate nitrogen, nitrite nitrogen, total nitrogen, phosphate, total phosphorus, carbonate, bicarbonate, chloride, sulfate, permanganate index, total chemical, total volatile phenol, surfactant, sulfide, silicate and borate, etc.

[0003] The flow injection analyzer is mainly composed of a sample injector, a peristaltic pump, a chemical reaction unit, a detector and an A / D converter. Flow injection analysis is actually a pipelined continuous flow analysis method. It mainly includes three processes: the sample solution is injected into the carrier, the sample solution and the carrier are mixed and reacted (the dispersion and reaction of the sample), and the sample solution flows into the detector at a constant speed with the carrier to be detected. The specific working process is as follows: Step 1: First, the sample is introduced into the carrier fluid pump through the sampler and mixed with the carrier fluid. The carrier fluid pump controls the flow rate and speed of the fluid through the distribution valve to ensure a constant flow of sample and carrier fluid.

[0004] Step 2: Next, the sample and carrier fluid enter the mixer through the injection valve. The injection valve is responsible for controlling the volume and injection time of the sample so that the sample is evenly mixed into the carrier fluid.

[0005] Step 3: The sample and the carrier liquid are thoroughly mixed in a mixer to form a uniform sample-carrier liquid mixture. The mixer can be a static mixer, a spiral mixer or other mixers.

[0006] Step 4: Finally, the mixture is transferred to a detector for detection. The detector can be an absorbance detector, a fluorescence detector, a conductivity detector, or other suitable detectors. They are used to measure the concentration or characteristics of the components contained in the mixture.

[0007] Regarding the mixing process in the above steps 2 and 3, traditional mixers often have problems such as low mixing efficiency and uneven mixing, which affects the accuracy and reliability of the analysis results; in addition, existing mixers also have the problem of insufficient adaptability when mixing fluids of different properties.

[0008] Therefore, a mixer for a flow injection apparatus is proposed. Summary of the invention

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a mixer for a flow injection apparatus.

[0010] The objective of the present invention is achieved through the following technical solutions: A mixer for a flow injection instrument comprises a mixing unit, an air intake unit and a heated self-opening unit arranged on the above-mentioned second sealing circular plate, the above-mentioned mixing unit comprises a mixing box and a feed box arranged on the top of the above-mentioned mixing box; the above-mentioned mixing box is provided with a first mixing chamber, a second mixing chamber and a discharge chamber in sequence from the center to the edge along its own radial direction, and the above-mentioned first mixing chamber is connected with the above-mentioned feed box; a first sealing circular plate is slidably provided at the bottom of the above-mentioned feed box; a second sealing circular plate is rotatably provided at the bottom of the above-mentioned mixing box, and an agitator is provided on the above-mentioned second sealing circular plate and located in the above-mentioned first mixing chamber, and the above-mentioned agitator is connected to the above-mentioned first sealing circular plate by an elastic telescopic rod, and the telescopic direction of the above-mentioned elastic telescopic rod is the same as the sliding direction of the above-mentioned first sealing circular plate; the above-mentioned air intake unit comprises a plurality of air intake pipes arranged on the above-mentioned mixing box, one end of any of the above-mentioned air intake pipes is connected with the above-mentioned discharge chamber, and the other end is connected with the above-mentioned feed box; the above-mentioned heated self-opening unit encloses and forms the side wall of the above-mentioned first mixing chamber.

[0011] Furthermore, in the present invention, a top cover is rotatably provided on the top of the mixing box, and the plurality of air inlet pipes are all provided on the top cover; a through hole adapted to the feed box is provided in the middle of the top cover, and the bottom of the feed box is provided in the through hole.

[0012] Further, in the present invention, the above-mentioned heated self-opening unit includes a plurality of heat-conducting sleeves arranged on the above-mentioned second sealing circular plate, a plurality of heat-conducting rods arranged one-to-one in the plurality of heat-conducting sleeves, a plurality of heat-conducting metal sheets arranged one-to-one on the plurality of heat-conducting sleeves, and a gear ring arranged on the above-mentioned top cover, the plurality of heat-conducting sleeves are distributed in a circular array about the central axis of the above-mentioned second sealing circular plate, the plurality of heat-conducting sleeves and the plurality of heat-conducting metal sheets enclose the side wall of the above-mentioned first mixing chamber; the diameter of any of the above-mentioned heat-conducting rods is equal to the inner diameter of any of the above-mentioned heat-conducting sleeves, any of the above-mentioned heat-conducting rods is rotatably connected to the above-mentioned top cover, any of the above-mentioned heat-conducting rods is provided with a gear adapted to the above-mentioned gear ring, and any of the above-mentioned gears is meshed with the above-mentioned gear ring; the above-mentioned second sealing circular plate is transmission-connected to a driving motor.

[0013] Furthermore, in the present invention, any of the above-mentioned heat-conducting metal sheets is a sheet-shaped rectangular structure, and the outer surface of the above-mentioned heat-conducting metal sheet is covered with a wrapping layer; one of the length sides of the above-mentioned heat-conducting metal sheet is connected to the above-mentioned heat-conducting sleeve, and the other length side is abutted against the adjacent heat-conducting sleeve; the bottom end of the above-mentioned heat-conducting metal sheet is attached to the above-mentioned second sealing circular plate.

[0014] Furthermore, in the present invention, the above-mentioned heat-conducting metal sheet includes an outer iron sheet and an inner copper sheet which are bonded to each other, and the above-mentioned outer iron sheet and the above-mentioned inner copper sheet are both located in the above-mentioned wrapping layer; the above-mentioned outer iron sheet is arranged close to the above-mentioned second mixing chamber, and the above-mentioned inner copper sheet is arranged close to the above-mentioned first mixing chamber; the above-mentioned inner copper sheet is provided with a plurality of first through grooves spaced from top to bottom on the length edge of the adjacent heat-conducting sleeve, and any of the above-mentioned first through grooves passes through the above-mentioned outer iron sheet.

[0015] Furthermore, in the present invention, the inner copper sheet has a top and a bottom, and the bottom end is attached to the second sealing circular plate. The inner copper sheet is provided with a plurality of second through grooves spaced from the top to the bottom along the length side of the adjacent heat-conducting sleeve, and the plurality of second through grooves and the plurality of first through grooves are staggered; any of the second through grooves penetrates the outer iron sheet; the lengths of the plurality of second through grooves are distributed in a stepped manner, and the length of the second through grooves near the bottom end is greater than the length of the second through grooves near the top end.

[0016] Furthermore, in the present invention, a foamed polyurethane layer is provided in the mixing box, and two sides of the foamed polyurethane layer are respectively the second mixing chamber and the discharge chamber.

[0017] Furthermore, in the present invention, one end of part of the heat-conducting rod away from the second sealing circular plate extends into the air intake pipe, and the end of the heat-conducting rod located in the air intake pipe is provided with a turbine blade; a one-way valve is provided at one end of any of the air intake pipes close to the feed box.

[0018] Furthermore, in the present invention, the agitator is of a conical structure, the large diameter end of the agitator is connected to the second sealing circular plate, and the small diameter end is arranged close to the first sealing circular plate; and spiral stirring blades are arranged on the conical surface of the agitator.

[0019] Furthermore, in the present invention, a plurality of feed pipes are provided on the feed box; a discharge pipe is provided on the mixing box, and the discharge pipe is communicated with the discharge chamber.

[0020] The beneficial effects of the present invention are: 1. The mixer for flow injection instrument mainly comprises a feed box and a first mixing chamber, a second mixing chamber and a discharge chamber in the mixing box. The liquid mixture formed after the sample and the carrier liquid are injected into the feed box can be gradually mixed in the feed box, the first mixing chamber and the second mixing chamber in sequence. The mixed liquid mixture finally flows into the discharge chamber and then is transported to the detector through the discharge pipe for detection. The heated self-opening unit installed in the mixing box can generate heat during the mixing process of the mixer. Part of the heat will be transferred to the liquid mixture in the first mixing chamber, thereby helping to improve the reaction rate and mixing rate of the liquid mixture. Another part of the heat will be transferred to the heat-conducting sleeve and the heat-conducting metal sheet. The heat-conducting metal sheet will expand and deform when heated, thereby causing a gap in the side wall of the first mixing chamber to facilitate the liquid mixture in the first mixing chamber to flow into the second mixing chamber. 2. Combined with the actual application scenarios of flow injection instrument (it is mainly used to determine soil ammonium nitrogen, nitrate nitrogen, nitrite nitrogen, etc. in soil analysis; it is mainly used to determine water quality ammonium nitrogen, nitrate nitrogen, nitrite nitrogen, total nitrogen, phosphate, total phosphorus, carbonate, bicarbonate, chloride, sulfate, permanganate index, total chemical, total volatile phenol, surfactant, sulfide, silicate and borate, etc. in water quality analysis), it can be known that the composition of the mixed liquid analyzed and detected by flow injection analyzer is generally complex, and there will be substances with different viscosities in it. On the one hand, this mixer is designed with multiple mixing chambers inside, and on the other hand, its special structural design can fully mix substances with different viscosities in the mixed liquid, thereby improving the accuracy and reliability of the analysis results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 For the present invention Figure 1 A cross-sectional view of Figure 3 This is a schematic diagram of the installation of a heated self-opening unit according to an embodiment of the present invention; Figure 4 This is a schematic structural diagram of a heated self-opening unit according to an embodiment of the present invention; Figure 5 This is a schematic structural diagram of a heated self-opening unit according to an embodiment of the present invention; Figure 6 The top view of the heat-conducting metal sheet according to the embodiment of the present invention is deformed by heat.

[0022] In the figure: 101-mixing box; 1011-first mixing chamber; 1012-second mixing chamber; 1013-discharging chamber; 102-feeding box; 201-first sealing circular plate; 301-second sealing circular plate; 401-agitation device; 501-elastic telescopic rod; 601-inlet pipe; 602-check valve; 603-pump air chamber; 701-top cover; 801-heat-conducting sleeve; 802-heat-conducting rod; 803-heat-conducting metal sheet; 8031-outer iron sheet; 8032-inner copper sheet; 804-gear ring; 805-gear; 806-driving motor; 901-first through groove; 1001-second through groove; 1101-foam polyurethane layer; 1201-turbine blade; 1301-feeding pipe; 1401-discharging pipe; 1501-limiting net; 1601-exhaust valve. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-6 , the present invention provides a technical solution: A mixer for a flow injection instrument, which is installed at a corresponding position of the flow injection instrument in actual use. The mixer includes a mixing unit, an air intake unit and a heat-induced self-opening unit installed on a second sealing circular plate 301. The mixing unit includes a mixing box 101 and a feed box 102 installed on the top of the mixing box 101; the mixing box 101 is provided with a first mixing chamber 1011, a second mixing chamber 1012 and a discharge chamber 1013 in sequence from the center to the edge along its own radial direction, and the first mixing chamber 1011 is connected to the feed box 102. A plurality of feed pipes 1301 are installed on the feed box 102; a discharge pipe 1401 is installed on the mixing box 101, and the discharge pipe 1401 is connected to the discharge chamber 1013. The plurality of feed pipes 1301 can be connected to the injection valve of the flow injection instrument, and the sample and the carrier fluid can be injected into the feed box 102 through the injection valve and the plurality of feed pipes 1301 in sequence. The uniformly mixed mixture is transported to the detector through the discharge pipe 1401 for detection.

[0025] Reference Figure 2, the bottom of the feed box 102 is slidably installed with a first sealing circular plate 201, and the first sealing circular plate 201 can slide in the vertical direction. The bottom bearing of the mixing box 101 is connected with a second sealing circular plate 301, and an agitator 401 is installed on the second sealing circular plate 301 in the first mixing chamber 1011, and the agitator 401 is connected to the first sealing circular plate 201 through an elastic telescopic rod 501. The telescopic direction of the elastic telescopic rod 501 is the same as the sliding direction of the first sealing circular plate 201. In this embodiment, the elastic telescopic rod 501 includes a support rod and a spring, and a limiting hole with a diameter identical to that of the support rod is installed on the agitator 401, and the support rod is placed in the limiting hole. The top of the support rod is fixedly connected to the first sealing circular plate 201, and its bottom end is connected to one end of the spring, and the other end of the spring is connected to the bottom of the limiting hole.

[0026] At the same time, if Figure 2 As shown, in order to limit the vertical displacement of the first sealing circular plate 201 in the feed box 102, a corresponding limiting groove can be designed in the above-mentioned limiting hole, and the extension direction of the limiting groove is parallel to the central axis of the limiting hole. At the same time, a limiting block adapted to the limiting groove is installed on the support rod. When the limiting block moves to the top of the limiting groove with the movement of the support rod, the first sealing circular plate 201 can no longer move upward in the feed box 102.

[0027] The air intake unit includes a plurality of air intake pipes 601 installed on the mixing box 101, one end of any air intake pipe 601 is connected to the discharge chamber 1013, and the other end is connected to the feed box 102. The heated self-opening unit encloses and forms the side wall of the first mixing chamber 1011. At the same time, an exhaust valve 1601 is also installed on the top cover 701, and the pipeline on which the exhaust valve 1601 is installed is connected to the first mixing chamber 1011. The gas in the first mixing chamber 1011 can be discharged to the outside through the exhaust valve 1601.

[0028] Reference Figure 1 and Figure 2 In this embodiment, a top cover 701 is rotatably installed on the top of the mixing box 101, and a plurality of air inlet pipes 601 are installed on the top cover 701; a through hole adapted to the feed box 102 is opened in the middle of the top cover 701, and the bottom of the feed box 102 is installed in the through hole.

[0029] Reference Figure 2-Figure 6In this embodiment, the heated self-opening unit includes a plurality of heat-conducting sleeves 801 installed on the second sealing circular plate 301, a plurality of heat-conducting rods 802 installed one-to-one in the plurality of heat-conducting sleeves 801, a plurality of heat-conducting metal sheets 803 installed one-to-one on the plurality of heat-conducting sleeves 801, and a gear ring 804 installed on the top cover 701. The plurality of heat-conducting sleeves 801 are distributed in a circular array about the central axis of the second sealing circular plate 301. The plurality of heat-conducting sleeves 801 and the plurality of heat-conducting metal sheets 803 enclose the side wall of the first mixing chamber 1011. The diameter of any heat-conducting rod 802 is equal to the inner diameter of any heat-conducting sleeve 801. Any heat-conducting rod 802 is rotatably connected to the top cover 701. A gear 805 adapted to the gear ring 804 is installed on any heat-conducting rod 802, and any gear 805 meshes with the gear ring 804. The second sealing circular plate 301 is transmission-connected to a driving motor 806. Refer to Figure 3-Figure 5 In this embodiment, the cross section of any heat-conducting metal sheet 803 is arc-shaped, and the center of the arc surface is located in the first mixing chamber 1011.

[0030] There are various structures that can generate heat by friction, and these structures can convert mechanical energy into heat energy when rubbing against each other. For example, metal materials such as copper, iron, aluminum, etc. deform and plastically change on the surface during friction, generating a large amount of heat energy. In this embodiment, both the heat-conducting sleeve 801 and the heat-conducting rod 802 can be made of common metal materials to facilitate frictional heat generation. In other implementations of this embodiment, the diameter of the portion of the heat-conducting rod 802 located in the heat-conducting sleeve 801 can also be smaller than the inner diameter of the heat-conducting sleeve 801, but a number of friction balls need to be designed on the outer wall of the portion of the heat-conducting rod 802 located in the heat-conducting sleeve 801, so that the friction balls on the heat-conducting rod 802 can continuously rub against the inner wall of the heat-conducting sleeve 801 during the rotation process, thereby generating a large amount of heat.

[0031] In this embodiment, the heat-conducting sleeve 801 and the heat-conducting rod 802 are both made of aluminum alloy. Aluminum alloy is light in weight, has good thermal conductivity, and can improve wear resistance through surface treatment. For example, the surface of aluminum alloy is often coated or oxidized, such as anodizing, which can significantly improve the hardness and wear resistance of the aluminum alloy surface, thereby enhancing its anti-friction ability. At the same time, the thermal conductivity of aluminum alloy is very excellent, and its thermal conductivity coefficient is as high as 204 W / (m·K), which is much higher than other metal materials such as stainless steel (about 14 W / (m·K)), which means that aluminum alloy can conduct heat faster.

[0032] In this embodiment, any thermally conductive metal sheet 803 is a sheet-shaped rectangular parallelepiped structure, and the outer surface of the thermally conductive metal sheet 803 is covered with a wrapping layer; one length side of the thermally conductive metal sheet 803 is connected to the thermally conductive sleeve 801, and the other length side abuts against the adjacent thermally conductive sleeve 801; the bottom end of the thermally conductive metal sheet 803 is attached to the second sealing circular plate 301.

[0033] In this embodiment, the heat-conducting metal sheet 803 is a bimetallic structure and an arc-shaped structure, which is composed of an outer iron sheet 8031 ​​and an inner copper sheet 8032 that fit each other, and the outer iron sheet 8031 ​​and the inner copper sheet 8032 are both located in the wrapping layer; the outer iron sheet 8031 ​​is arranged close to the second mixing chamber 1012, and the inner copper sheet 8032 is arranged close to the first mixing chamber 1011; the inner copper sheet 8032 is close to the adjacent heat-conducting sleeve 801 and is provided with a plurality of first through grooves 901 from top to bottom, and any first through groove 901 passes through the outer iron sheet 8031.

[0034] The principle of the bending of bimetallic strips when heated is based on the different coefficients of thermal expansion of different metal materials. Bimetallic strips are usually made of two different metal sheets, such as iron and copper. When the bimetallic strip is heated, the two metals will expand to different degrees due to their different coefficients of thermal expansion. The metal with a larger coefficient of thermal expansion will expand more, while the metal with a smaller coefficient of thermal expansion will expand less. This different degree of expansion will cause the bimetallic strip to bend, with the metal with a larger coefficient of thermal expansion bending towards the metal with a smaller coefficient of thermal expansion. For example, when the bimetallic strip is made of iron and copper, since copper has a larger coefficient of thermal expansion than iron, the copper will bend towards the iron when heated.

[0035] It should be noted that it takes a certain amount of time for the heat-conducting metal sheet 803 to be bent by heat, during which the following steps can be completed: the liquid mixture is first preliminarily mixed in the feed box 102, and then enters the first mixing chamber 1011 for secondary mixing.

[0036] In this embodiment, the inner copper sheet 8032 has a top and a bottom, and its bottom end is attached to the second sealing circular plate 301. A plurality of second through grooves 1001 are arranged at intervals from the top to the bottom on the length side of the inner copper sheet 8032 close to the adjacent heat-conducting sleeve 801, and the plurality of second through grooves 1001 and the plurality of first through grooves 901 are staggered; any second through groove 1001 passes through the outer iron sheet 8031; the lengths of the plurality of second through grooves 1001 are distributed in a stepped manner, and the length of the second through groove 1001 close to the bottom is greater than the length of the second through groove 1001 close to the top.

[0037] In this embodiment, a foam polyurethane layer 1101 is provided in the mixing box 101, and two sides of the foam polyurethane layer 1101 are respectively a second mixing chamber 1012 and a discharge chamber 1013. Figure 2 As shown, in this embodiment, the foam polyurethane layer 1101 is obliquely installed in the mixing box 101. The foam polyurethane is an elastic material with a porous structure, and the fine pores inside it can prevent liquid from passing through to a certain extent. When subjected to force, the foam polyurethane will deform and the pore diameter can increase, thereby changing its ability to block liquid and facilitating the passage of liquid.

[0038] Reference Figure 1 and Figure 2 In order to facilitate the delivery of external air into the feed box 102, in this embodiment, a pump air chamber 603 is also installed on the air inlet pipe 601, and the end of the heat-conducting rod 802 away from the second sealing disc 301 extends into the pump air chamber 603, and the end of the heat-conducting rod 802 located in the pump air chamber 603 is installed with a turbine blade 1201; at the same time, a one-way valve 602 is installed at the end of any air inlet pipe 601 close to the feed box 102, and the external air can enter the feed box 102 through this one-way valve 602, but the air in the feed box 102 cannot be discharged to the outside through this one-way valve 602. In this way, this design can deliver external air into the feed box 102 through the discharge pipe 1401, the discharge chamber, the air inlet pipe 601, the pump air chamber 603 and the one-way valve 602 in sequence during the process of the driving motor 806 driving the second sealing disc 301 to rotate.

[0039] In order to facilitate the mixer to fully mix the liquid mixture in the first mixing chamber 1011, in this embodiment, the stirrer 401 is designed as a conical structure, and the large diameter end of the stirrer 401 is connected to the second sealing circular plate 301, and the small diameter end is close to the first sealing circular plate 201, and a spiral stirring blade is provided on the conical surface of the stirrer 401. In this way, the liquid mixture at the bottom of the first mixing chamber 1011 can move upward under the action of the spiral stirring blade.

[0040] Working principle: Main reference Figure 2 First, the sample and the carrier fluid can be injected into the feed box 102 through a plurality of feed tubes 1301 by a peristaltic pump.

[0041] The feed box 102 and the first sealing circular plate 201 form a closed chamber in the feed box 102 (although the feed box 102 is equipped with a plurality of air inlet pipes 601, each air inlet pipe 601 is equipped with a one-way valve 602, and the outside air can enter the feed box 102 through the one-way valve 602, but the air in the feed box 102 cannot be discharged to the outside through the one-way valve 602). Then, the driving motor 806 is started to rotate the second sealing circular plate 301. During the rotation of the second sealing circular plate 301, the plurality of heat-conducting sleeves 801 and the plurality of heat-conducting rods 802 rotate around the central axis of the second sealing circular plate 301, and at the same time, the top cover 701 is driven by the plurality of heat-conducting rods 802 and rotates synchronously with the second sealing circular plate 301. During this process, due to the presence of several gears 805 and gear rings 804, each heat-conducting rod 802 rotates around its own central axis in each heat-conducting sleeve 801 when the second sealing disc 301 rotates. Each turbine blade 1201 located in the pump air chamber 603 rotates synchronously, so that the air pressure in the pump air chamber 603 increases. During this process, the outside air can enter the feed box 102 through the discharge pipe 1401, the discharge chamber, the air intake pipe 601, the pump air chamber 603 and the one-way valve 602 in sequence. After the air with a certain flow rate and pressure is sprayed into the feed box 102, it can produce a vortex in the liquid mixture in the feed box 102 in conjunction with the rotation of the feed box 102, and the liquid mixture is preliminarily mixed.

[0042] Then, as air is continuously input into the feed box 102, the air pressure inside the feed box 102 becomes larger and larger. When this air pressure value overcomes the elastic force of the spring at the bottom of the elastic telescopic rod 501, the first sealing circular plate 201 moves downward (moves toward the second sealing circular plate 301), and when the first sealing circular plate 201 moves down into the first mixing chamber 1011, the feed box 102 is connected with the first mixing chamber 1011. The liquid mixture at the bottom of the feed box 102 can be discharged into the first mixing chamber 1011. At this time, since the feed box 102 is connected with the first mixing chamber 1011, the gas in the first mixing chamber 1011 can be discharged through the exhaust valve 1601. Therefore, when the feed box 102 is connected with the first mixing chamber 1011, the air pressure in the feed box 102 will decrease. When the air pressure decreases, the first sealing circular plate 201 moves upward again under the action of the elastic telescopic rod 501 until the first sealing circular plate 201 is in a balanced state. Then the space in the feed box 102 becomes a closed chamber again, and the air pressure in the feed box 102 gradually increases with time. Repeat the above steps, and finally the liquid mixture in the feed box 102 will be completely discharged into the first mixing chamber 1011.

[0043] When the liquid mixture in the feed box 102 is completely discharged into the first mixing chamber 1011 , the structure design of the agitator 401 located in the first mixing chamber 1011 can remix the liquid mixture in the first mixing chamber 1011 .

[0044] It should be noted that different samples may have different viscosities. The higher the viscosity of a liquid, the easier it is to sink under gravity. Therefore, during the rotation of the second sealing disc 301, if there are substances with different viscosities in the liquid mixture, generally, the liquid with low viscosity in the liquid mixture has better fluidity due to its smaller internal friction between molecules, and is more likely to flow toward the side wall of the first mixing chamber 1011 (i.e., flow toward a plurality of heat-conducting metal sheets 803 and a plurality of heat-conducting sleeves 801) along the radial direction of the second sealing disc 301 under the action of centrifugal force. However, the liquid with high viscosity has a larger internal friction between molecules, and its fluidity is relatively poor, and it is more difficult to quickly flow toward the side wall of the first mixing chamber 1011 along the radial direction of the second sealing disc 301 under the action of centrifugal force.

[0045] However, under the action of centrifugal force, all the liquid mixtures in the first mixing chamber 1011 will eventually move toward the side walls of the first mixing chamber 1011 (i.e., the plurality of heat-conducting sleeves 801 and the plurality of heat-conducting metal sheets 803), but the liquids with different viscosities will contact the heat-conducting sleeves 801 and the heat-conducting metal sheets 803 at different times. Since the inner side wall of the first mixing chamber 1011 is an irregular surface (enclosed by the plurality of heat-conducting sleeves 801 and the plurality of heat-conducting metal sheets 803), the inner side wall of the first mixing chamber 1011 will also play a role in mixing and stirring the liquid mixture during the mixing process of the liquid mixture in the first mixing chamber 1011.

[0046] In the above mixing process, since each heat-conducting rod 802 is always in a state of self-rotation under the action of the gear 805 and the gear ring 804, the friction between the heat-conducting rod 802 and the heat-conducting sleeve 801 during the self-rotation process will generate heat. As time goes by, the temperature of the heat-conducting sleeve 801 will become higher and higher, and part of this temperature will be transferred to the liquid mixture in the first mixing chamber 1011. The increase in the temperature of the liquid mixture helps to increase the mixing rate (because when the temperature increases, the thermal motion of the molecules intensifies and the diffusion rate accelerates, making it easier for the molecules to contact each other, thereby increasing the mixing rate).

[0047] For the part of the liquid with higher viscosity in the liquid mixture, the temperature increase can reduce its viscosity. When the viscosity decreases, the fluidity of the liquid increases, the resistance in the mixing process decreases, and the mixing rate increases. Another part of the temperature of the heat-conducting sleeve 801 will be transferred to the heat-conducting metal sheet 803, and the heat-conducting metal sheet 803 will expand when heated.

[0048] Reference Figure 4-Figure 6Since the thermal expansion coefficient of the inner copper sheet 8032 is greater than that of the outer iron sheet 8031, the inner copper sheet 8032 will bend toward the outer iron sheet 8031. Since the heat-conducting metal sheet 803 (bimetallic sheet) composed of the inner copper sheet 8032 and the outer iron sheet 8031 ​​is provided with a plurality of first through grooves 901 on one side close to the adjacent heat-conducting sleeve 801, Figure 5 From the perspective of the heat conducting metal sheet 803, the resistance of the right part of the heat conducting metal sheet 803 when being bent by heat is small, and this part is more likely to bend, rather than the entire heat conducting metal sheet 803 being greatly bent. When the right part of the heat conducting metal sheet 803 is bent, it is equivalent to opening a channel, so that the liquid mixture in the first mixing chamber 1011 enters the second mixing chamber 1012 from the area between the current heat conducting sleeve 801 and the heat conducting metal sheet 803.

[0049] It should be noted that, since liquids with high viscosity are more likely to sink and have lower fluidity, when the above-mentioned channel is opened, liquids with low viscosity are more likely to flow toward the side wall of the first mixing chamber 1011, which will make it difficult for the liquid mixture to be fully mixed. Figure 3 and Figure 5 The heat-conducting metal sheet 803 (bimetallic sheet) is also provided with a plurality of second through slots 1001 on one side close to the adjacent heat-conducting sleeve 801. The lengths of the plurality of second through slots 1001 decrease in sequence and form a step-like shape. Therefore, when the heat-conducting metal sheet 803 is bent by heat, the bending amplitude of the lower part close to one end of the adjacent heat-conducting sleeve 801 will be greater, which will increase the displacement of the high-viscosity liquid at the bottom of the first mixing chamber 1011, so that the high-viscosity liquid has sufficient time to flow into the second mixing chamber 1012.

[0050] Finally, when the bending amount of the lower end of the heat conductive metal sheet 803 reaches the maximum, refer to Figure 6 The portion of the heat-conducting metal sheet 803 protruding from the second mixing chamber 1012 can mix and stir the liquid mixture in the second mixing chamber 1012 during the rotation of the second sealing disc 301; at the same time, this structure can also apply a thrust along the radial direction of the second sealing disc 301 to the liquid mixture in the second mixing chamber 1012, and this thrust is directed toward the discharge chamber 1013. The foamed polyurethane layer 1101 is deformed toward the discharge chamber 1013 after receiving the pressure generated by this thrust, and the diameter of the holes inside it increases, so that the liquid mixture in the second mixing chamber 1012 will enter the discharge chamber 1013, and the liquid mixture in the discharge chamber 1013 will finally be transported to the detector through the discharge pipe 1401 for detection.

[0051] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A mixer for a flow injection apparatus, characterized in that: include: A mixing unit, the mixing unit comprising a mixing box (101) and a feed box (102) arranged on the top of the mixing box (101); a first mixing chamber (1011), a second mixing chamber (1012) and a discharge chamber (1013) are arranged in sequence from the center to the edge of the mixing box (101) along its own radial direction, and the first mixing chamber (1011) is communicated with the feed box (102); a first sealing circular plate (201) is slidably arranged at the bottom of the feed box (102); a second sealing circular plate (301) is rotatably arranged at the bottom of the mixing box (101), and an agitator (401) is arranged on the second sealing circular plate (301) in the first mixing chamber (1011), and the agitator (401) is connected to the first sealing circular plate (201) via an elastic telescopic rod (501), and the telescopic direction of the elastic telescopic rod (501) is the same as the sliding direction of the first sealing circular plate (201); An air intake unit, the air intake unit comprising a plurality of air intake pipes (601) arranged on the mixing box (101), one end of any of the air intake pipes (601) being in communication with the discharge chamber (1013), and the other end of any of the air intake pipes (601) being in communication with the feed box (102); A heated self-opening unit is arranged on the second sealing circular plate (301), and the heated self-opening unit encloses and forms a side wall of the first mixing chamber (1011).

2. A mixer for a flow injection apparatus according to claim 1, characterized in that: A top cover (701) is rotatably provided on the top of the mixing box (101), and a plurality of the air inlet pipes (601) are all provided on the top cover (701); a through hole adapted to the feed box (102) is provided in the middle of the top cover (701), and the bottom of the feed box (102) is provided in the through hole.

3. A mixer for a flow injection apparatus according to claim 2, characterized in that: The heated self-opening unit comprises a plurality of heat-conducting sleeves (801) arranged on the second sealing circular plate (301), a plurality of heat-conducting rods (802) arranged one-to-one in the plurality of heat-conducting sleeves (801), a plurality of heat-conducting metal sheets (803) arranged one-to-one on the plurality of heat-conducting sleeves (801), and a gear ring (804) arranged on the top cover (701), wherein the plurality of heat-conducting sleeves (801) are distributed in a circular array about the central axis of the second sealing circular plate (301), and the plurality of heat-conducting sleeves (801) are arranged in a circular array. and a plurality of the heat-conducting metal sheets (803) enclose a side wall of the first mixing chamber (1011); the diameter of any of the heat-conducting rods (802) is equal to the inner diameter of any of the heat-conducting sleeves (801); any of the heat-conducting rods (802) is rotatably connected to the top cover (701); any of the heat-conducting rods (802) is provided with a gear (805) adapted to the gear ring (804); any of the gears (805) is meshed with the gear ring (804); and the second sealing circular plate (301) is transmission-connected to a driving motor (806).

4. A mixer for a flow injection apparatus according to claim 3, characterized in that: Any of the heat-conducting metal sheets (803) is a sheet-shaped rectangular parallelepiped structure, and the outer surface of the heat-conducting metal sheet (803) is covered with a wrapping layer; one length side of the heat-conducting metal sheet (803) is connected to the heat-conducting sleeve (801), and the other length side abuts against the adjacent heat-conducting sleeve (801); and the bottom end of the heat-conducting metal sheet (803) is attached to the second sealing circular plate (301).

5. A mixer for a flow injection apparatus according to claim 4, characterized in that: The heat-conducting metal sheet (803) comprises an outer iron sheet (8031) and an inner copper sheet (8032) which are bonded to each other, and the outer iron sheet (8031) and the inner copper sheet (8032) are both located in the wrapping layer; the outer iron sheet (8031) is arranged close to the second mixing chamber (1012), and the inner copper sheet (8032) is arranged close to the first mixing chamber (1011); a plurality of first through grooves (901) are arranged at intervals from top to bottom on the length edge of the inner copper sheet (8032) close to the adjacent heat-conducting sleeve (801), and any of the first through grooves (901) passes through the outer iron sheet (8031).

6. A mixer for a flow injection apparatus according to claim 5, characterized in that: The inner copper sheet (8032) has a top end and a bottom end, and the bottom end is attached to the second sealing circular plate (301). The inner copper sheet (8032) is provided with a plurality of second through grooves (1001) spaced from the top end to the bottom end on a length side close to the adjacent heat-conducting sleeve (801), and the plurality of second through grooves (1001) and the plurality of first through grooves (901) are arranged alternately; any of the second through grooves (1001) passes through the outer iron sheet (8031); the lengths of the plurality of second through grooves (1001) are distributed in a stepped manner, and the length of the second through groove (1001) close to the bottom end is greater than the length of the second through groove (1001) close to the top end.

7. A mixer for a flow injection apparatus according to claim 5, characterized in that: A foam polyurethane layer (1101) is provided in the mixing box (101), and two sides of the foam polyurethane layer (1101) are respectively a second mixing chamber (1012) and a discharge chamber (1013).

8. A mixer for a flow injection apparatus according to claim 3, characterized in that: One end of a portion of the heat-conducting rods (802) away from the second sealing circular plate (301) extends into the air inlet pipe (601), and a turbine blade (1201) is provided at the end of the heat-conducting rods (802) located in the air inlet pipe (601); a one-way valve (602) is provided at one end of any of the air inlet pipes (601) close to the feed box (102).

9. A mixer for a flow injection apparatus according to claim 1, characterized in that: The stirrer (401) is a conical structure; the large-diameter end of the stirrer (401) is connected to the second sealing circular plate (301), and the small-diameter end is arranged close to the first sealing circular plate (201); and a spiral stirring blade is arranged on the conical surface of the stirrer (401).

10. A mixer for a flow injection apparatus according to claim 1, characterized in that: The feed box (102) is provided with a plurality of feed pipes (1301); the mixing box (101) is provided with a discharge pipe (1401), and the discharge pipe (1401) is connected to the discharge chamber (1013).

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