CN212722748U - Heating constant temperature device for ion chromatograph - Google Patents
Heating constant temperature device for ion chromatograph Download PDFInfo
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- CN212722748U CN212722748U CN202021427183.2U CN202021427183U CN212722748U CN 212722748 U CN212722748 U CN 212722748U CN 202021427183 U CN202021427183 U CN 202021427183U CN 212722748 U CN212722748 U CN 212722748U
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Abstract
The utility model provides a heating constant temperature equipment for ion chromatograph, including column incubator casing and leacheate preheating module, leacheate preheating module sets up in column incubator casing, the inside of column incubator casing is provided with base, silica gel heating film, aluminum alloy bottom plate, aluminum alloy upper plate and aluminum alloy lower plate, all seted up U type recess on aluminum alloy upper plate and the aluminum alloy lower plate, and the installation board of aluminum alloy lower plate is provided with the chromatogram post clamp, the chromatogram post clamp is in the third of aluminum alloy bottom plate total length; the leacheate preheating module comprises a leacheate pipeline and a pipeline accommodating groove, and the pipeline accommodating groove is formed in one side, back to the chromatographic column, of the aluminum alloy upper plate and the aluminum alloy lower plate. The utility model provides a heating constant temperature device for an ion chromatograph, which uses a buckle type design and is convenient for taking and placing chromatographic columns; the temperature consistency of the leacheate and the chromatographic column is ensured by the leacheate preheating module, and the accuracy of detection and analysis results is further ensured.
Description
Technical Field
The utility model belongs to the ion chromatogram field, concretely relates to ion chromatograph is with heating constant temperature equipment.
Background
Ion chromatography separates a sample by means of adsorption, ion exchange, or the like, which is in a chemically or physically balanced state and has a large temperature dependence. In particular, in the ion chromatograph equipped with the conductivity detector, in the working process of the ion chromatograph, the conductivity of the solution changes by 2-2.5% every time the temperature changes by 1 ℃, and therefore, the temperature inside the chromatographic column and the temperature of a system flow path have great influence on the detection result.
At present, the temperature of the chromatographic column is mostly controlled by adopting a method for controlling the column temperature, and the equilibrium can be stabilized by stably maintaining the column temperature, so that good reproducibility can be obtained on the separation, selectivity and retention time of a sample. Chinese patent cn201620021948.x a homogenizing treatment device for heated air in an ion chromatographic column incubator, which designs an ion chromatographic system, and the technical scheme is as follows: a heating wire, a temperature sensor, a heating block, a turbofan and a turbofan air channel are fixedly arranged in the incubator; the heating wire is fixed on the heating block, and a temperature sensor is also arranged on the heating wire; the fan is arranged at the upper part in the column incubator and is communicated with the turbofan air duct, and the turbofan air duct is communicated to the lower part in the incubator from top to bottom; the heating block is heated to a set temperature by controlling the heating wires through the temperature sensor, and floating hot air is sucked by the turbofan and guided into the bottom of the column box through the fan air duct to forcibly form air circulation. This scheme will heat air in the circulation of column incubator formation through a fan, has the heat conduction homogeneity not good and the problem of accuse temperature accuracy deviation. In addition, column incubator among the prior art, for fixed arrangement chromatographic column, two chromatographic column presss from both sides about setting up at least to a chromatographic column, and the chromatographic column presss from both sides the pine can make the chromatographic column fixed insecure easily not hard up moreover, and the chromatographic column presss from both sides the inconvenient getting of tension and puts.
In addition, in the prior art, the leacheate is directly conveyed to the chromatographic column, and the temperature of the leacheate is inconsistent with that of the chromatographic column, so that the accuracy of a detection and analysis result is influenced. Because the system flow path is long, no good method for controlling the temperature of the leacheate in the flow path of the ion chromatography system exists at present. The temperature difference between the leacheate and the chromatographic column ensures that the temperature of the chromatographic column is not stable all the time, so that the problems of poor reproducibility and poor accuracy of a detection result occur.
Therefore, how to design an ion chromatography heat preservation device which is convenient to use and improves the accuracy of analysis results is the technical problem to be solved by the utility model.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem in the background art and providing a heating constant temperature device for an ion chromatograph. The utility model provides a heating constant temperature device for an ion chromatograph, which uses a buckle type design and is convenient for taking and placing chromatographic columns; including the leacheate preheating module, the temperature consistency of the leacheate and the chromatographic column is ensured, and then the accuracy of a detection and analysis result is ensured.
The above technical purpose of the present invention is achieved by the following technical solutions:
a heating constant temperature device for an ion chromatograph comprises a column temperature box shell and an eluent preheating module, wherein the eluent preheating module is arranged in the column temperature box shell, a base, a silica gel heating film, an aluminum alloy bottom plate, an aluminum alloy upper plate and an aluminum alloy lower plate are arranged inside the column temperature box shell, the base is close to a rear cover, the base, the silica gel heating film and the aluminum alloy bottom plate are sequentially connected, the aluminum alloy upper plate is arranged on the upper portion of the aluminum alloy bottom plate, the aluminum alloy lower plate is arranged on the lower portion of the aluminum alloy bottom plate, U-shaped grooves for accommodating chromatographic columns are formed in the aluminum alloy upper plate and the aluminum alloy lower plate, a mounting plate portion of the aluminum alloy lower plate is provided with a chromatographic column clamp for clamping the chromatographic columns, and the chromatographic column clamp is located below the aluminum alloy bottom plate and is located in;
the leacheate preheating module comprises a leacheate pipeline and a pipeline accommodating groove for accommodating the leacheate pipeline, a liquid outlet of the leacheate pipeline is connected with an inlet of the chromatographic column, and the pipeline accommodating groove is formed in one side, back to the chromatographic column, of the aluminum alloy upper plate and the aluminum alloy lower plate.
As above a heating constant temperature equipment for ion chromatograph, the chromatographic column presss from both sides including post clamp installation department, supporting part, arc portion and jaw portion, the post clamp installation department is provided with the mounting hole, the supporting part includes first supporting part and second supporting part, arc portion includes first arc portion and second arc portion, jaw portion includes first jaw portion and second jaw portion, first arc portion, first supporting part, post clamp installation department, second supporting part, second arc portion and second jaw portion connect gradually into an organic whole structure, first jaw portion, first arc portion, first supporting part use the center of installation department to take out as the symmetry with second jaw portion, second arc portion, second supporting part difference one-to-one symmetry.
In the heating thermostat device for an ion chromatograph, the first and second jaws are outwardly opened at an angle of 40 to 60 degrees.
As above a heating constant temperature equipment for ion chromatograph, column temperature case casing is equipped with two chromatographic columns, the aluminum alloy upper plate includes first U type recess and second U type recess, the aluminum alloy hypoplastron includes third U type recess and fourth U type recess, first U type recess forms the cavity that holds one of them chromatographic column with third U type recess cooperation, third U type recess and fourth U type recess cooperation form the cavity that holds another chromatographic column.
According to the heating constant temperature device for the ion chromatograph, the length of the eluent pipeline is 0.5-1.0 m.
According to the heating constant temperature device for the ion chromatograph, the aluminum alloy bottom plate is provided with the pipeline guide groove for guiding the leacheate pipeline.
According to the heating constant temperature device for the ion chromatograph, the aluminum alloy bottom plate is provided with the temperature sensor.
According to the heating constant temperature device for the ion chromatograph, the column oven shell comprises the front cover, the side cover and the rear cover, the rear cover is fixedly connected with the periphery of the side cover, and the front cover is detachably connected with the side cover.
According to the heating thermostat device for the ion chromatograph, the front cover and the side cover are detachably connected through the buckles.
According to the heating thermostat device for the ion chromatograph, the front cover, the side cover and the rear cover respectively comprise an outer shell and an inner shell, and heat-preservation and heat-insulation materials are filled between the outer shell and the inner shell.
Compared with the prior art, the utility model has the advantages of it is following and beneficial effect:
1. the utility model provides a pair of ion chromatograph is with heating constant temperature equipment, preheat the module including column incubator casing and leacheate, the leacheate preheats the module and sets up in column incubator casing, has realized preheating in advance of leacheate for the temperature that flows into the leacheate of chromatographic column or the leacheate that bears the sample through the leacheate pipeline keeps unanimous with the inside temperature of chromatographic column, has avoided the temperature difference, has guaranteed analysis result's accuracy.
2. The utility model provides a pair of ion chromatograph is with heating constant temperature equipment, all set up the U type recess that holds the chromatographic column on aluminum alloy upper plate and the aluminum alloy hypoplastron, the chromatographic column is partly surrounded to U type recess, has good heat preservation effect.
3. The utility model provides a pair of ion chromatograph is with heating constant temperature equipment, the chromatographic column presss from both sides and is located aluminum alloy bottom plate below and in the third department of aluminum alloy bottom plate total length, the chromatographic column presss from both sides including column clamp installation department, supporting part, arc portion and clamp oral area, structure integrated into one piece to a chromatographic column only need a chromatographic column press from both sides can, compare in prior art, the chromatographic column not only has good clamping capacity, and it is convenient to get the chromatographic column moreover, has more saved the use of material, has practiced thrift manufacturing cost.
4. The utility model provides a pair of ion chromatograph is with heating constant temperature equipment, simple structure, the ion chromatograph that can arrange any producer production uses, has vast application prospect.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art, and it is obvious that the following description is only one embodiment of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of an external structure of a heating thermostat for an ion chromatograph according to the present invention;
fig. 2 is a schematic view of the internal structure of a heating thermostat for an ion chromatograph according to the present invention;
fig. 3 is a schematic view of the cross-sectional structure of a heating thermostat for an ion chromatograph according to the present invention;
FIG. 4 is a schematic structural view of the aluminum alloy bottom plate, the aluminum alloy upper plate and the aluminum alloy lower plate of the present invention;
FIG. 5 is a partial enlarged view of portion A of FIG. 4;
fig. 6 is a schematic back structural view of the aluminum alloy upper plate and the aluminum alloy lower plate of the present invention;
fig. 7 is a schematic perspective view of the chromatographic column holder of the present invention;
FIG. 8 is a schematic top view of the chromatographic column clamp of FIG. 7;
FIG. 9 is a schematic front view of the chromatographic column clamp of FIG. 7;
fig. 10 is a schematic diagram of the position of the temperature sensor according to the present invention.
1-front cover, 2-side cover, 3-back cover, 4-buckle, 5-chromatographic column, 6-chromatographic column clamp, 7-base, 8-silica gel heating film, 9-aluminum alloy bottom plate, 10-aluminum alloy upper plate, 11-aluminum alloy lower plate, 12-pipeline guide groove, 13-pipeline containing groove, 14-pipeline through hole, 15-leacheate pipeline, 16-temperature sensor, 61-installation part, 62-clamping opening part, 63-arc part, 64-support part, 101-first U-shaped groove, 102-second U-shaped groove, 103-first bolt hole, 111-third U-shaped groove, 112-fourth U-shaped groove, 113-second bolt hole, 114-installation plate part, 610-installation hole, 621-first clamping opening part, 622-second nip portion, 631-first arc portion, 632-second arc portion, 641-first support portion, 642-second support portion.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained without creative work by the ordinary skilled person in the art all belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
Example 1:
referring to fig. 1-6, a heating thermostat for an ion chromatograph includes a column oven housing and an eluent preheating module, the eluent preheating module is disposed in the column oven housing, a base 7, a silica gel heating film 8, an aluminum alloy bottom plate 9, an aluminum alloy upper plate 10 and an aluminum alloy lower plate 11 are disposed inside the column oven housing, the base 7 is close to a rear cover 3, the base 7, the silica gel heating film 8 and the aluminum alloy bottom plate 9 are sequentially connected, the aluminum alloy upper plate 10 is disposed on an upper portion of the aluminum alloy bottom plate 9 through a first bolt hole 103 by a bolt, the aluminum alloy lower plate 11 is disposed on a lower portion of the aluminum alloy bottom plate 9 through a second bolt hole 113 by a bolt, U-shaped grooves for accommodating a chromatographic column 5 are respectively disposed on the aluminum alloy upper plate 10 and the aluminum alloy lower plate 11, a mounting plate portion 114 of the aluminum alloy lower plate 11 is provided with a chromatographic column clamp 6 for clamping the chromatographic column, the chromatographic column clamp 6 is positioned below the aluminum alloy bottom plate 9 and is one third of the total length of the aluminum alloy bottom plate 9; the leacheate preheating module comprises a leacheate pipeline 15 and a pipeline accommodating groove 13 for accommodating the leacheate pipeline 15, a liquid outlet of the leacheate pipeline 15 is connected with an inlet of the chromatographic column 5, and the pipeline accommodating groove 13 is formed in one side, back to the chromatographic column 5, of the aluminum alloy upper plate 10 and the aluminum alloy lower plate 11.
During the use, adopt the circular telegram of silica gel heating film 8 to heat, the heat transmits to aluminum alloy upper plate 10 and aluminum alloy hypoplastron 11 through aluminum alloy bottom plate 9, sets up the leacheate pipeline 15 in pipeline storage tank 13 and is heated, all set up the U type recess that holds chromatographic column 5 on aluminum alloy upper plate 10 and the aluminum alloy hypoplastron 11 and be used for semi-surrounding chromatographic column 5, U type recess has good heat preservation and heat transfer effect, and chromatographic column 5 is heated and keeps warm. The technical scheme of this embodiment has guaranteed the uniformity of the temperature of leacheate pipeline 15 and chromatographic column 5, has realized preheating in advance of leacheate for the temperature of the leacheate that flows into chromatographic column 5 through leacheate pipeline 15 or the leacheate that bears the weight of the sample keeps unanimous with the inside temperature of chromatographic column 5, has avoided the temperature difference, has guaranteed the accuracy of analysis result.
Preferably, the length of the leacheate pipeline 15 is between 0.5 and 1.0 m. Specifically, the leacheate pipeline 15 is a PEEK pipeline, and is coiled into a ring shape, a spiral shape or any other bendable shape and is arranged in the pipeline accommodating groove 13, the length of the leacheate pipeline 15 is shorter than 0.5m and cannot reach the preheating effect, the length of the leacheate pipeline 15 is longer than 1.0m, and the PEEK pipeline has extremely high rigidity, hardness and tensile strength and is not easy to bend and place.
Preferably, the aluminum alloy bottom plate 9 is provided with a pipeline guide groove 12 for guiding the leacheate pipeline 15. Specifically, the pipeline guide groove 12 is provided at the upper end and the lower end of the aluminum alloy bottom plate 9, the eluent pipeline 15 at the eluent inlet penetrates into the pipeline accommodating groove 13 through the pipeline guide groove 12 at the lower end of the aluminum alloy bottom plate 9, and the eluent pipeline 15 at the eluent outlet is connected with the chromatographic column 5 through the pipeline guide groove 12 at the upper end of the aluminum alloy bottom plate 9.
Referring to fig. 10, preferably, a temperature sensor 16 is disposed on the aluminum alloy bottom plate 9. In this embodiment, there are two temperature sensors 16, which are respectively disposed on the aluminum alloy bottom plate 9 near the aluminum alloy upper plate 10 and the aluminum alloy lower plate 11, and can respectively monitor the temperatures of the aluminum alloy upper plate 10 and the aluminum alloy lower plate 11 in real time, and transmit the monitored temperature data to the control system, thereby implementing the thermostatic control of the buckle-type ion chromatography heat preservation device of this embodiment.
Preferably, the column incubator shell comprises a front cover 1, a side cover 2 and a rear cover 3, wherein the rear cover 3 is fixedly connected with the periphery of the side cover 2, and the front cover 1 is detachably connected with the side cover 2. Preferably, the front cover 1 and the side cover 2 are detachably connected through a buckle 4. The design of buckle 4 formula, the appearance is pleasing to the eye, and convenient operation has realized fine sealed setting moreover, is favorable to getting of chromatographic column 5 and puts.
Preferably, the side cover 2 is provided with a pipeline through hole 14, so that the leacheate pipeline 15 can conveniently enter and exit.
Preferably, the front cover 1, the side covers 2 and the rear cover 3 each comprise an outer shell and an inner shell, and a heat insulating material is filled between the outer shell and the inner shell. The front cover 1, the side covers 2 and the rear cover 3 enable the interior of the column oven shell to form a sealed heat-preservation environment, heat loss is reduced, and a better heat-preservation effect is achieved.
Example 2:
referring to fig. 7-9, based on embodiment 1, preferably, the chromatographic column clamp 6 includes a column clamp installation part 61, a support part 62, an arc part 63 and a clamp opening part 62, the post clamp mounting part 61 is provided with a mounting hole 610, the supporting part 62 includes a first supporting part 641 and a second supporting part 642, the arc portion 63 includes a first arc portion 631 and a second arc portion 632, the nip portion 62 includes a first nip portion 621 and a second nip portion 622, the first nip portion 621, the first arc portion 631, the first support portion 641, the post clamp mounting portion 61, the second support portion 642, the second arc portion 632 and the second nip portion 622 are sequentially connected to form an integral structure, the first nip portion 621, the first arc portion 631 and the first support portion 641 are respectively symmetrical to the second nip portion 622, the second arc portion 632 and the second support portion 642 in a one-to-one correspondence manner by taking the center of the mounting portion 61 as a symmetry. The column clamp 6 is mounted to the mounting plate portion 114 by bolts through the mounting holes 610.
Preferably, the first nip portion 621 and the second nip portion 622 are outwardly opened at an angle of 40 ° to 60 °. Referring to fig. 9 again, most preferably, the first clamping opening 621 and the second clamping opening 622 are opened outward at an angle of 50 °, and the opened angle facilitates the taking and placing of the chromatographic column 5, and the arcs of the first arc portion 631 and the second arc portion 632 are adapted to the outer tube of the chromatographic column 5, so as to clamp the chromatographic column 5. In this embodiment, a chromatographic column 5 only need a chromatographic column press from both sides 6 can, compare in prior art, chromatographic column 6 not only has good clamping capacity, and it is convenient to get and put chromatographic column 5 moreover, has more saved the use of material, has practiced thrift manufacturing cost.
Example 3:
referring to fig. 2 and 4, the difference from embodiment 1 is that the column incubator housing is provided with two chromatographic columns 5, the aluminum alloy upper plate 10 includes a first U-shaped groove 101 and a second U-shaped groove 102, the aluminum alloy lower plate 11 includes a third U-shaped groove 111 and a fourth U-shaped groove 112, the first U-shaped groove 101 and the third U-shaped groove 111 cooperate to form a cavity for accommodating one of the chromatographic columns 5, and the third U-shaped groove 111 and the fourth U-shaped groove 112 cooperate to form a cavity for accommodating the other chromatographic column 5. The present embodiment is suitable for a dual-flow-path system of an ion chromatograph, for example, a column oven shell is provided with two chromatographic columns 5, namely an anion chromatographic column and a cation chromatographic column, and correspondingly, a flow-path system of an eluent pipeline 15 is provided with two paths.
The utility model provides a pair of ion chromatograph is with heating constant temperature equipment can solve the unsafe problem of testing result that leacheate temperature and chromatographic column temperature difference are big and lead to, moreover, the ion chromatograph that can arrange any producer production uses.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A heating constant temperature device for an ion chromatograph comprises a column oven shell and an eluent preheating module, wherein the eluent preheating module is arranged in the column oven shell,
a base (7), a silica gel heating film (8), an aluminum alloy bottom plate (9), an aluminum alloy upper plate (10) and an aluminum alloy lower plate (11) are arranged in the column temperature box shell, the base (7) is close to the rear cover (3), the base (7), the silica gel heating film (8) and the aluminum alloy bottom plate (9) are connected in sequence, the aluminum alloy upper plate (10) is arranged at the upper part of the aluminum alloy bottom plate (9), the aluminum alloy lower plate (11) is arranged at the lower part of the aluminum alloy bottom plate (9), the aluminum alloy upper plate (10) and the aluminum alloy lower plate (11) are both provided with U-shaped grooves for accommodating the chromatographic columns (5), the mounting plate part (114) of the aluminum alloy lower plate (11) is provided with a chromatographic column clamp (6) for clamping a chromatographic column (5), the chromatographic column clamp (6) is positioned below the aluminum alloy bottom plate (9) and is one third of the total length of the aluminum alloy bottom plate (9);
the leacheate preheating module comprises a leacheate pipeline (15) and a pipeline accommodating groove (13) for accommodating the leacheate pipeline (15), a liquid outlet of the leacheate pipeline (15) is connected with an inlet of the chromatographic column (5), and the pipeline accommodating groove (13) is arranged on one side, back to the chromatographic column (5), of the aluminum alloy upper plate (10) and the aluminum alloy lower plate (11).
2. The heating thermostat device for the ion chromatograph according to claim 1, wherein the chromatographic column clamp (6) comprises a column clamp installation part (61), a support part (64), an arc part (63) and a clamp opening part (62), the column clamp installation part (61) is provided with an installation hole (610), the support part (64) comprises a first support part (641) and a second support part (642), the arc part (63) comprises a first arc part (631) and a second arc part (632), the clamp opening part (62) comprises a first clamp opening part (621) and a second clamp opening part (622), the first clamp opening part (621), the first arc part (631), the first support part (641), the column clamp installation part (61), the second support part (642), the second arc part (632) and the second clamp opening part (622) are sequentially connected into an integrated structure, and the first clamp opening part (621), The first arc-shaped part (631) and the first supporting part (641) are symmetrically drawn out of the second nip part (622), the second arc-shaped part (632) and the second supporting part (642) by taking the center of the mounting part (61) as a symmetry.
3. The heating thermostat device for ion chromatograph according to claim 2, wherein the first nip portion (621) and the second nip portion (622) are formed to be opened outward at an angle of 40 ° to 60 °.
4. The heating thermostat device for the ion chromatograph according to claim 1, wherein the column oven housing is provided with two chromatographic columns (5), the aluminum alloy upper plate (10) comprises a first U-shaped groove (101) and a second U-shaped groove (102), the aluminum alloy lower plate (11) comprises a third U-shaped groove (111) and a fourth U-shaped groove (112), the first U-shaped groove (101) and the third U-shaped groove (111) cooperate to form a cavity for accommodating one of the chromatographic columns (5), and the third U-shaped groove (111) and the fourth U-shaped groove (112) cooperate to form a cavity for accommodating the other chromatographic column (5).
5. The heating thermostat device for ion chromatograph according to claim 1, wherein the length of the eluent pipe (15) is between 0.5 and 1.0 m.
6. The heating thermostat device for the ion chromatograph according to claim 1, characterized in that the aluminum alloy base plate (9) is provided with a line guide groove (12) for guiding a shower liquid line (15).
7. The heating thermostat device for ion chromatograph according to claim 1, characterized in that a temperature sensor (16) is arranged on the aluminum alloy base plate (9).
8. The heating thermostat device for the ion chromatograph according to claim 1, characterized in that the column oven housing comprises a front cover (1), a side cover (2) and a rear cover (3), the rear cover (3) is fixedly connected with the periphery of the side cover (2), and the front cover (1) is detachably connected with the side cover (2).
9. The heating thermostat device for the ion chromatograph according to claim 8, characterized in that the front cover (1) and the side cover (2) are detachably connected through a buckle (4).
10. The heating thermostat device for the ion chromatograph according to claim 8 or 9, characterized in that the front cover (1), the side covers (2) and the rear cover (3) each comprise an outer shell and an inner shell, and a heat-insulating material is filled between the outer shell and the inner shell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021427183.2U CN212722748U (en) | 2020-07-20 | 2020-07-20 | Heating constant temperature device for ion chromatograph |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021427183.2U CN212722748U (en) | 2020-07-20 | 2020-07-20 | Heating constant temperature device for ion chromatograph |
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| CN212722748U true CN212722748U (en) | 2021-03-16 |
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