CN104764860A - Analyzing and metering device and liquid analysis system - Google Patents
Analyzing and metering device and liquid analysis system Download PDFInfo
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- 238000004458 analytical method Methods 0.000 title claims abstract description 120
- 239000012530 fluid Substances 0.000 claims abstract description 65
- 239000002699 waste material Substances 0.000 claims abstract description 28
- 238000004891 communication Methods 0.000 claims description 6
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- 239000007924 injection Substances 0.000 description 4
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- 238000004313 potentiometry Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002572 peristaltic effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004737 colorimetric analysis Methods 0.000 description 2
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- 238000001514 detection method Methods 0.000 description 2
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Abstract
The invention discloses an analyzing and metering device and a liquid analysis system, relating to the technical field of fluid analysis and aiming to solve the problem of inaccuracy in liquid metering and achieve accuracy in metering of liquids in different volumes, thus improving the measurement accuracy of the liquid analysis system. The analyzing and metering device mainly comprises a first control valve, a reaction analysis device, a metering tube and a fluid driver, wherein the first control valve comprises a public port and a plurality of distribution ports which can be alternatively communicated with the public port; the plurality of distribution ports include at least one blind hole port and an air port communicated with the atmosphere; the reaction analysis device is provided with a first channel opening and a second channel opening; the metering tube is connected between the public port and the first channel opening; a first connecting tube orifice is formed in the wall of the metering tube and is connected with a first waste liquid tube by a second control valve; the inner diameter of the metering tube is less than 4mm; the fluid driver is connected with the reaction analysis device. The analyzing and metering device is mainly used in the technical field of chemical analysis instruments.
Description
Technical Field
The present invention relates to the field of fluid analysis technologies, and in particular, to an analytical metering device and a liquid analysis system.
Background
In chemical analysis instruments, the design of a liquid path metering system is extremely important, and the design directly influences the accuracy of analysis results. The existing liquid analysis system is generally provided with an analysis metering device for metering an acquired liquid sample, and the analysis metering device is used for accurately metering liquid so as to ensure the measurement precision of the liquid analysis system.
In the prior art, liquid storage units are mostly adopted for transferring liquid in a metering mode, but when the volume of liquid in a reaction analysis device is larger than that of the liquid storage units in the metering mode, transfer operation needs to be performed more than once in a reciprocating mode, the transfer steps are complex and time-consuming, liquid films and even liquid beads are easily remained on the inner walls of the liquid storage units, and the measurement accuracy of an analysis system is affected.
Disclosure of Invention
In view of the above, the present invention provides an analysis and measurement device and a liquid analysis system, and aims to solve the problem of inaccurate liquid measurement, achieve accurate measurement of liquids with different volumes, and improve the measurement accuracy of the liquid analysis system.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
in one aspect, an embodiment of the present invention provides an analytical metering device, including:
a first control valve including a common port and a plurality of distribution ports capable of alternatively communicating with the common port, the plurality of distribution ports including at least one blind hole port and an air port communicating with the atmosphere;
a reaction analysis device having a first port and a second port;
the metering pipe is connected between the public port and the first channel port, a first connecting pipe port is arranged on the pipe wall of the metering pipe, and the first connecting pipe port is connected with a first waste liquid pipe through a second control valve; wherein the metering tube is a tube with an inner diameter of less than 4 mm;
and the fluid driver is connected with the reaction analysis device.
As previously mentioned, the inner diameter of the metering tube is in the range of 0.2mm to 2 mm.
As previously mentioned, the internal diameter of the reaction analysis device is greater than 6 mm.
As mentioned above, further comprising: a liquid detector; the liquid detector is disposed on the metering tube.
As mentioned above, the liquid detector disposed on the metering tube specifically includes:
the liquid detector is arranged on the line section between the first passage opening and the first connection opening.
As mentioned above, further comprising: a connecting pipe;
the fluid driver is connected with the reaction analysis device and specifically comprises:
the fluid driver is connected with the second passage port through the connecting pipe.
As mentioned above, the connection between the fluid driver and the reaction analysis apparatus is specifically:
the fluid driver is disposed in a conduit section of the metering tube, and the second port is in communication with the atmosphere.
As mentioned above, the fluid driver is disposed in the pipe section of the metering pipe, specifically:
the fluid driver is arranged in the pipeline section between the liquid detector and the first passage port; or,
the fluid driver is arranged in a pipeline section between the liquid detector and the first connecting port; or,
the fluid driver is disposed in the conduit section between the first connector nozzle and the common port.
As mentioned above, further comprising: at least one third control valve;
the pipe wall of the metering pipe is also provided with at least one second connecting pipe orifice and is positioned on the pipe wall between the first connecting pipe orifice and the public port;
the at least one second connecting nozzle is connected to the second waste pipe through the at least one third control valve.
In one aspect, embodiments of the present invention provide a liquid analysis system, including:
a first control valve including a common port and a plurality of distribution ports capable of alternatively communicating with the common port, the plurality of distribution ports including at least one blind hole port and an air port communicating with the atmosphere;
a reaction analysis device having a first port and a second port;
the metering pipe is connected between the public port and the first channel port, a first connecting pipe port is arranged on the pipe wall of the metering pipe, and the first connecting pipe port is connected with a first waste liquid pipe through a second control valve; wherein the metering tube is a tube with an inner diameter of less than 4 mm;
and the fluid driver is connected with the reaction analysis device.
A control circuit for controlling the start and stop of the operations of the first control valve, the second control valve, the reaction analysis device, and the fluid driver;
wherein the first control valve, the second control valve, the reaction analysis device and the fluid driver are all connected with the control circuit.
By the technical scheme, the analysis and metering device and the liquid analysis system at least have the following advantages:
the analysis metering device is provided with the first control valve, the metering pipe, the reaction analysis device and the fluid driver which are connected in series, and the plurality of distribution ports provided with the first control valve comprise an air port communicated with the atmosphere, so that liquid always moves in the same direction when liquid is fed or discharged, the defect that a sequential injection type flow path system must transfer the liquid through the liquid storage unit is avoided, the length of the liquid flowing through the pipeline and the surface area of the pipeline wall are reduced when the liquid is fed, the probability of liquid film residue or wall hanging on the pipeline wall is reduced, the liquid feeding precision is improved, and particularly the liquid feeding precision is improved when the liquid is slightly fed (such as below 0.1 ml); and due to the small size of the metering tube: the measuring tube is a tube with the inner diameter smaller than 4mm, so that liquid can directly and smoothly flow upwards into the reaction analysis device by utilizing the surface tension and viscosity of the liquid in the thin tube, and the liquid cannot flow backwards along the tube wall; on the other hand, the plurality of distribution ports of the first control valve comprise at least one blind hole port, the pipe wall of the metering pipe is provided with the connecting pipe orifice, and the first connecting pipe orifice is connected with the first waste liquid pipe through the second control valve, so that when the waste liquid is discharged, the waste liquid in the metering pipe and the waste liquid in the reaction analysis device can be conveniently and smoothly discharged only by switching the first control valve to the blind hole port and opening the second control valve.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an analytical metering device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another analytical metering device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a further analytical metering device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a reaction analysis apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of another reaction analysis apparatus provided in the embodiment of the present invention;
FIG. 6 is a schematic structural view of another reaction analysis apparatus provided in the embodiment of the present invention;
FIG. 7 is a schematic structural view of still another reaction analysis apparatus provided in the embodiment of the present invention;
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined object, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As shown in fig. 1, an embodiment of the present invention provides an analytical metering device, which includes:
a first control valve 1, a reaction analysis device 2, a metering tube 3, a second control valve 4, and a fluid actuator 5. Wherein,
a first control valve 1 including a common port 11 and a plurality of distribution ports 12 capable of alternatively communicating with the common port 11, the plurality of distribution ports 12 including a blind hole port 121 and an air port 122 communicating with the atmosphere; the number of the blind hole ports 121 may be one or multiple, which is not limited in the specific embodiment of the present invention and may be set as required.
A reaction analysis device 2 having a first passage port 21 and a second passage port 22;
a measuring pipe 3 connected between the common port 11 and the first passage port 21, a first connection pipe 311 being provided on a pipe wall 31 of the measuring pipe 3, the first connection pipe 311 being connected to a first waste pipe (not shown in the figure) through a second control valve 4; wherein the metering tube 3 is a tube with an inner diameter of less than 4 mm;
a fluid driver 5 connected to the reaction analyzer 2;
specifically, the first control valve 1 is used for injecting and switching different kinds of liquid, and has a common port 11 and a plurality of distribution ports 12, which can be alternatively communicated with the common port 11, such as by controlling the control system to realize the communication between the common port 11 and any one of the distribution ports 12. According to the test requirement, part of the distribution ports 12 are used for being connected with different types of liquids to be tested, waste liquid containers and the like; the air port 122 is connected to the atmosphere, and when the common port 11 is switched to be connected to the air port 122, air can be drawn into the pipeline and the reaction analysis device 2 to perform a function of feeding the liquid in the metering pipe 3 into the reaction analysis device 2, and the liquid in the reaction analysis device 2 can be mixed or the pipeline can be cleaned. The number of distribution ports 12 can be selected according to the actual need. Of course, the first control valve 1 may also be a multi-channel control valve formed by a plurality of two-way valves and a plurality of connecting pipes, wherein two ends of each two-way valve are respectively connected to the common port and the distribution port, and the specific embodiment of the present invention is not limited thereto, as long as it can have a common port and a plurality of distribution ports that can alternatively communicate with the common port, all belong to the protection scope of the embodiment of the present invention.
The reaction analysis device 2 is used for storing the metered different kinds of liquids, the different kinds of liquids react in the reaction analysis device 2, and the related characteristics of the liquids in the reaction analysis device 2 are detected through some detection components. The reaction and analysis device 2 may be an integral structure or a separate structure including a reaction device and an analysis device, and the specific embodiment of the present invention is not limited thereto, as long as the functions of reaction and analysis can be achieved, and the present invention is within the scope of the embodiment of the present invention.
According to the analysis metering device provided by the embodiment of the invention, the first control valve 1, the metering pipe 3, the reaction analysis device 2 and the fluid driver 5 are connected in series, and the plurality of distribution ports 12 of the first control valve 1 comprise the air port 122 communicated with the atmosphere, so that liquid always moves in the same direction when liquid is fed or discharged, the defect that a sequential injection type flow path system is required to transfer the liquid through a liquid storage unit is avoided, the length of the liquid flowing through a pipeline and the surface area of the pipeline wall when the liquid is fed are reduced, the probability of residual liquid film or wall hanging on the pipeline wall of the liquid is reduced, the liquid feeding precision is improved, and particularly the liquid feeding precision when the liquid is slightly fed (such as below 0.1 ml) is improved; and due to the small size of the metering tube: the measuring tube is a tube with the inner diameter smaller than 4mm, so that liquid can directly and smoothly flow upwards into the reaction analysis device by utilizing the surface tension and viscosity of the liquid in the thin tube, and the liquid cannot flow backwards along the tube wall; on the other hand, by arranging the plurality of distribution ports 12 of the first control valve 1 to include the blind hole port 121, arranging the first connection pipe opening 311 on the pipe wall 31 of the metering pipe 3 and arranging the first connection pipe opening 311 to be connected with the first waste liquid pipe through the second control valve 4, when the waste liquid is discharged, the waste liquid in the metering pipe 3 and the waste liquid in the reaction analysis device 2 can be conveniently and smoothly discharged only by switching the first control valve 1 to the blind hole port 121 and opening the second control valve 4.
Furthermore, in order to make the liquid in the thin tube utilize the surface tension and viscosity of the liquid to directly and smoothly feed the liquid upwards into the reaction analysis device 2, the inner diameter of the measuring tube 3 is in the range of 0.2mm-2mm, at this moment, the liquid in the measuring tube 3 utilizes the surface tension and viscosity of the liquid to directly and smoothly feed the liquid upwards into the reaction analysis device 2, thereby preventing the liquid from flowing backwards along the tube wall.
Further, in order to facilitate the reaction and detection analysis of various liquids in the reaction and analysis device 2, the inner diameter of the reaction and analysis device 2 is larger than 6 mm, and the structure is designed to facilitate the uniform mixing of various liquids in the reaction and analysis device 2 and the discharge of redundant bubbles from the reaction and analysis device 2.
Further, in order to improve the liquid feeding efficiency, as shown in fig. 1, the liquid feeding device further includes: a liquid detector 6; the liquid detector 6 is provided on the metering tube 3.
Specifically, the liquid detector 6 is a non-contact liquid level sensor that is not in contact with the fluid, or a non-contact photoelectric meter that is not in contact with the fluid, and may also be other non-contact liquid detectors that are not in contact with the fluid, or may also be a liquid detector that is in contact with the liquid.
Further, the liquid detector 6 is disposed on a pipe section between the first passage port 21 and the first connection port 311.
Further, the analytical metering device further comprises: a connecting pipe 7; as shown in fig. 1, the fluid driver 5 is connected to the second passage port 22 via a connection pipe 7.
Further, in addition to the fluid driver 5 being connected to the second passage opening 22 via the connecting pipe 7, the fluid driver 5 may be disposed in a pipe section of the measuring pipe 3, as shown in fig. 2, the fluid driver 5 being disposed in a pipe section of the measuring pipe 3; the second port 22 is in communication with the atmosphere.
Further, the fluid driver 5 may be disposed in a pipe section between the liquid detector 6 and the first passage port 21, in a pipe section between the liquid detector 6 and the first connection pipe port 311, and in a pipe section between the first connection pipe port 311 and the common port 11. The specific embodiment of the present invention is not limited thereto, as long as it can drive the liquid to flow to the reaction analysis apparatus through the first control valve, and thus the embodiment of the present invention is within the protection scope of the embodiment of the present invention.
In the embodiment of the present invention, the fluid driver 5 is disposed in the pipe section of the metering pipe 3, so that the analysis and metering device can drive the liquid to flow to the reaction and analysis device 2 through the first control valve 1 by the fluid driver 5, and the second passage 22 of the reaction and analysis device 2 is disposed to communicate with the atmosphere, so that the space above the reaction and analysis device 2 no longer has a positive pressure or a negative pressure with respect to the atmosphere, when the fluid driver 5 stops driving, the liquid can immediately stop flowing, and the liquid level in the reaction and analysis device 2 does not generate disturbance. Therefore, the volume precision of the liquid taken by the analysis and measurement device can be ensured; in addition, the fluid actuator 5 itself stops the flow of liquid when it is not operating, corresponding to the function of a stop valve.
Further, in order to discharge the excess liquid and automatically discharge the waste liquid after the liquid analysis is completed, no extra liquid discharging device is required, the fluid driver 5 is a fluid driver driven in both forward and reverse directions, wherein the fluid driver 5 may be a peristaltic pump, and when the peristaltic pump stops working, the peristaltic pump stops the flow of the liquid, which is equivalent to the function of a stop valve. Of course, the fluid driver 5 may be other types of pump and valve combinations, and the specific embodiment of the present invention is not limited thereto, as long as the fluid driver is a bi-directional fluid driver and has a shut-off valve function, and thus the present invention is within the scope of the embodiments.
Further, in order to achieve accurate metering of more different volumes of liquid, the analytical metering device further comprises: at least one third control valve 8, as shown in figure 3,
the pipe wall 31 of the metering pipe 3 is further provided with at least one second connecting pipe opening 312, and the second connecting pipe opening 312 is positioned on the pipe wall between the first connecting pipe opening 311 and the public port 11;
the at least one second connecting nozzle 312 is connected to a second waste pipe (not shown) via the at least one third control valve 8.
Further, as shown in fig. 4, the reaction analysis apparatus 2 includes a light source 23 and a light detector 24.
When the reaction analysis apparatus 2 is of an integral structure, as shown in fig. 4, the light source 23 and the photodetector 24 are respectively disposed on both sides of the reaction analysis apparatus 2, and the light source 23 and the photodetector 24 are on the same optical path. The light emitted from the light source 23 is transmitted through the liquid in the reaction analyzer 2, and then received by the photodetector 24, and the liquid is analyzed by the principle of photometric colorimetry.
When the reaction analyzer 2 is a separate structure including the reaction device 25 and the analyzer 26, as shown in fig. 5, the analyzer is an integral tube formed by sequentially connecting and continuously communicating a first tube segment 261, a second tube segment 262 and a third tube segment 263, wherein the tube walls of the second tube segment 262 are respectively provided with a planar light-transmitting window, and the light source 23 and the light detector 24 are respectively provided on both sides of the second tube segment 262. The light emitted from the light source 23 is transmitted through the liquid in the second tube 262, and then received by the light detector 24, and the liquid is analyzed by the principle of photometric colorimetry.
Further, the reaction analysis apparatus 2 further comprises an electrode pair 27, as shown in fig. 6, wherein the electrode pair 27 may be one or more pairs,
when the reaction analysis apparatus 2 is of an integral structure, the electrode pair 27 is provided in the reaction analysis apparatus 2, and the liquid is analyzed by potentiometry after the liquid enters the reaction analysis apparatus 2 or reacts in the reaction analysis apparatus 2.
When the reaction analyzer 2 is a separate structure, the electrode pair 27 is provided in the analyzer 26, and the liquid is analyzed by potentiometry after entering the analyzer 26.
Further, the reaction analysis apparatus 2 further comprises one or more ion-selective electrodes 28, as shown in fig. 7;
when the reaction analysis apparatus 2 is of an integral structure, one or more ion selective electrodes 28 are provided in the reaction analysis apparatus 2, and the liquid is analyzed by a permselective membrane and potentiometry after the liquid enters the reaction analysis apparatus 2 or reacts in the reaction analysis apparatus 2.
When the reaction analysis apparatus 2 is of a separate structure, one or more ion selective electrodes 28 are provided in the analysis apparatus 26, and after the liquid has entered the analysis apparatus 26, the liquid is analyzed by a permselective membrane and potentiometry.
Further, the reaction analysis apparatus 2 may also include other structures for analyzing liquid, and the specific embodiment of the present invention is not limited as long as it can analyze liquid, and the embodiments of the present invention are within the protection scope.
The following description will be given by way of example of an analytical metering device provided in fig. 3, in which the analytical metering device allows precise metering of different volumes of liquid.
First, the internal volume of the pipe section between the common port 11 and the second connection pipe port 312 is set to a, and the internal volume of the pipe section between the second connection pipe port 312 and the first connection pipe port 311 is set to B.
The working process of measuring the liquid volume A + B is as follows:
the first step is as follows: switching the first control valve 1 to a distribution port 12 for liquid to be taken, the common port 11 being in communication with the distribution port 12 for liquid to be taken;
the second step is that: controlling the fluid driver 5 to work in a forward driving mode, sucking the liquid corresponding to the distribution port 12 of the liquid to be taken into the metering tube 3 under the driving of the fluid driver 5, and stopping the fluid driver 5 when the liquid detector 6 detects the liquid or stopping the operation after delaying for a period of time;
the third step: the first control valve 1 is switched to the blind hole port 121, the common port 11 is communicated with the blind hole port 121, and the second control valve 4 is opened;
the fourth step: the fluid driver 4 is reversely driven to discharge the liquid in the pipe section between the liquid detector 6 and the first connection pipe 311 through the second control valve 4;
the fifth step: the second control valve 4 is closed, the first control valve 1 is switched to the air port 122, and the common port 11 communicates with the air port 122;
and a sixth step: the fluid driver 5 is driven to work in a forward direction until all the liquid to be sampled in the metering pipe 3 is introduced into the reaction analysis device 2;
the seventh step: by repeating the first to sixth steps, the liquid corresponding to the distribution port 12 of the same first control valve 1 or the distribution ports 12 of other first control valves 1 can be supplied to the reaction analysis device 2 in a desired amount.
The working process of measuring the liquid volume A is as follows:
the first step is as follows: switching the first control valve 1 to a distribution port 12 for liquid to be taken, the common port 11 being in communication with the distribution port 12 for liquid to be taken;
the second step is that: controlling the fluid driver 5 to work in a forward driving mode, sucking the liquid corresponding to the distribution port 12 of the liquid to be taken into the metering tube 3 under the driving of the fluid driver 5, and stopping the fluid driver 5 when the liquid detector 6 detects the liquid or stopping the operation after delaying for a period of time;
the third step: the first control valve 1 is switched to the blind hole port 121, the common port 11 is communicated with the blind hole port 121, and the third control valve 8 is opened;
the fourth step: the fluid driver 5 is driven reversely to discharge the liquid in the pipe section between the liquid detector 6 and the second connecting pipe port 312 through the third control valve 8;
the fifth step: closing the third control valve 8, switching the first control valve 1 to the air port 122, with the common port 11 communicating with the air port 122;
and a sixth step: the fluid driver 5 is driven to work in a forward direction until all the liquid to be sampled in the metering pipe 3 is introduced into the reaction analysis device 2;
the seventh step: by repeating the first to sixth steps, the liquid corresponding to the distribution port 12 of the same first control valve 1 or the distribution ports 12 of other first control valves 1 can be supplied to the reaction analysis device 2 in a desired amount.
By replacing different volumes of the metering tube 3 or adjusting the position of the liquid detector 6, the volume of liquid entering the reaction analysis apparatus 2 can be adjusted.
The working process of the analysis and metering device for realizing accurate metering of liquids with different volumes is described by taking a liquid detector as an example, and when the analysis and metering device is not provided with the liquid detector, liquid can be taken according to set liquid inlet time in the liquid taking process.
The analysis metering device provided by the embodiment of the invention is provided with the first control valve, the metering pipe, the reaction analysis device and the fluid driver which are connected in series, and the plurality of distribution ports provided with the first control valve comprise the air port communicated with the atmosphere, so that liquid always moves in the same direction when liquid is fed or discharged, the defect that a sequential injection type flow path system must transfer the liquid through the liquid storage unit is avoided, the length of the liquid flowing through the pipeline and the surface area of the pipeline wall are reduced when the liquid is fed, the probability of liquid film residue or wall hanging on the pipeline wall is reduced, the liquid feeding precision is improved, and particularly the liquid feeding precision is improved when the liquid is slightly fed (such as below 0.1 ml); and due to the small size of the metering tube: the measuring tube is a tube with the inner diameter smaller than 4mm, so that liquid can directly and smoothly flow upwards into the reaction analysis device by utilizing the surface tension and viscosity of the liquid in the thin tube, and the liquid cannot flow backwards along the tube wall; on the other hand, the plurality of distribution ports of the first control valve comprise at least one blind hole port, the pipe wall of the metering pipe is provided with the connecting pipe orifice, and the first connecting pipe orifice is connected with the first waste liquid pipe through the second control valve, so that when the waste liquid is discharged, the waste liquid in the metering pipe and the waste liquid in the reaction analysis device can be conveniently and smoothly discharged only by switching the first control valve to the blind hole port and opening the second control valve.
The present invention also provides a liquid analysis system comprising:
a first control valve including a common port and a plurality of distribution ports capable of alternatively communicating with the common port, the plurality of distribution ports including at least one blind hole port and an air port communicating with the atmosphere;
a reaction analysis device having a first port and a second port;
the metering pipe is connected between the public port and the first channel port, a first connecting pipe port is arranged on the pipe wall of the metering pipe, and the first connecting pipe port is connected with a first waste liquid pipe through a second control valve; wherein the metering tube is a tube with an inner diameter of less than 4 mm;
and the fluid driver is connected with the reaction analysis device.
A control circuit for controlling the start and stop of the operations of the first control valve, the second control valve, the reaction analysis device, and the fluid driver;
wherein the first control valve, the second control valve, the reaction analysis device and the fluid driver are all connected with the control circuit.
The liquid analysis system provided by the embodiment of the invention is characterized in that the first control valve, the metering pipe, the reaction analysis device and the fluid driver are connected in series, and the plurality of distribution ports provided with the first control valve comprise an air port communicated with the atmosphere, so that liquid always moves in the same direction when liquid is fed or discharged, the defect that a sequential injection type flow path system is required to transfer the liquid through the liquid storage unit is avoided, the length of the liquid flowing through the pipeline and the surface area of the pipeline wall are reduced when the liquid is fed, the probability of liquid film residue or wall hanging on the pipeline wall is reduced, the liquid feeding precision is improved, and particularly the liquid feeding precision is improved when the liquid is slightly fed (such as below 0.1 ml); and due to the small size of the metering tube: the measuring tube is a tube with the inner diameter smaller than 4mm, so that liquid can directly and smoothly flow upwards into the reaction analysis device by utilizing the surface tension and viscosity of the liquid in the thin tube, and the liquid cannot flow backwards along the tube wall; on the other hand, the plurality of distribution ports of the first control valve comprise at least one blind hole port, the pipe wall of the metering pipe is provided with the connecting pipe orifice, and the first connecting pipe orifice is connected with the first waste liquid pipe through the second control valve, so that when the waste liquid is discharged, the waste liquid in the metering pipe and the waste liquid in the reaction analysis device can be conveniently and smoothly discharged only by switching the first control valve to the blind hole port and opening the second control valve.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (10)
1. An analytical metering device, comprising:
a first control valve including a common port and a plurality of distribution ports capable of alternatively communicating with the common port, the plurality of distribution ports including at least one blind hole port and an air port communicating with the atmosphere;
a reaction analysis device having a first port and a second port;
the metering pipe is connected between the public port and the first channel port, a first connecting pipe port is arranged on the pipe wall of the metering pipe, and the first connecting pipe port is connected with a first waste liquid pipe through a second control valve; wherein the metering tube is a tube with an inner diameter of less than 4 mm;
and the fluid driver is connected with the reaction analysis device.
2. The analytical metering device of claim 1,
the inner diameter of the metering tube is in the range of 0.2mm-2 mm.
3. The analytical metering device of claim 1 or 2,
the reaction analysis device has an inner diameter greater than 6 mm.
4. The analytical metering device of claim 3, further comprising:
a liquid detector disposed on the metering tube.
5. The analytical metering device of claim 4,
the liquid detector is arranged on the metering pipe and specifically comprises:
the liquid detector is arranged on the line section between the first passage opening and the first connection opening.
6. The analytical metering device of claim 5, further comprising:
a connecting pipe;
the fluid driver is connected with the reaction analysis device and specifically comprises:
the fluid driver is connected with the second passage port through the connecting pipe.
7. The analytical metering device of claim 5,
the fluid driver is connected with the reaction analysis device and specifically comprises:
the fluid driver is disposed in a conduit section of the metering tube, and the second port is in communication with the atmosphere.
8. The analytical metering device of claim 7,
the fluid driver is arranged in the pipeline section of the metering pipe and specifically comprises:
the fluid driver is arranged in the pipeline section between the liquid detector and the first passage port; or,
the fluid driver is arranged in a pipeline section between the liquid detector and the first connecting port; or,
the fluid driver is disposed in the conduit section between the first connector nozzle and the common port.
9. The analytical metering device of claim 1 or 5 further comprising:
at least one third control valve;
the pipe wall of the metering pipe is also provided with at least one second connecting pipe orifice and is positioned on the pipe wall between the first connecting pipe orifice and the public port;
the at least one second connecting nozzle is connected to the second waste pipe through at least one third control valve.
10. A liquid analysis system, comprising:
a first control valve including a common port and a plurality of distribution ports capable of alternatively communicating with the common port, the plurality of distribution ports including at least one blind hole port and an air port communicating with the atmosphere;
a reaction analysis device having a first port and a second port;
the metering pipe is connected between the public port and the first channel port, a first connecting pipe port is arranged on the pipe wall of the metering pipe, and the first connecting pipe port is connected with a first waste liquid pipe through a second control valve; wherein the metering tube is a tube with an inner diameter of less than 4 mm;
a fluid driver connected to the reaction analysis apparatus;
a control circuit for controlling the start and stop of the operations of the first control valve, the second control valve, the reaction analysis device, and the fluid driver;
wherein the first control valve, the second control valve, the reaction analysis device and the fluid driver are all connected with the control circuit.
Priority Applications (1)
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