A quantitative liquid inlet device suitable for online chemical analysis of water vapor

Abstract

The present invention provides a quantitative liquid inlet device suitable for online chemical analysis of water vapor, comprising: a liquid reservoir, a transfer device, a first electrically controlled valve, a second electrically controlled valve, a liquid level detection component and a controller; the liquid reservoir is provided with a liquid outlet on its bottom wall; the transfer device has a liquid storage chamber, and the bottom of the liquid storage chamber is provided with a liquid inlet and a liquid outlet; the first electrically controlled valve controls the on-off of the liquid inlet; the second electrically controlled valve controls the on-off of the liquid outlet; the liquid level detection component is provided on the transfer device to detect the liquid in place in the liquid storage chamber. By providing a transfer device, the present application allows the liquid in the liquid reservoir to quantitatively enter the liquid storage chamber under the action of gravity, and then flow into the reaction tank through the liquid outlet at the bottom. In the process of quantitative liquid delivery, no power source needs to be added, so it has the characteristics of simple structure and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of quantitative supply equipment, and in particular to a quantitative liquid inlet device suitable for online chemical analysis of water vapor. Background Art

[0002] The quantitative supply of liquid is a crucial step in online water vapor chemical analysis, and its accuracy directly impacts the analysis results. Existing water vapor chemical analysis systems typically use peristaltic pumps for sample and drug delivery. However, peristaltic pumps are complex in structure and primarily operate by squeezing a flexible tube to deliver liquid, resulting in a hose lifespan of only about one year. Consumables must be replaced annually, leading to high maintenance costs. Furthermore, if the peristaltic pump outlet hose becomes clogged with drug crystals and is not promptly detected and addressed, continued liquid delivery could cause the hose to burst, posing a safety risk. Summary of the Invention

[0003] In view of the above shortcomings of the prior art, the present invention provides a quantitative liquid inlet device suitable for online chemical analysis of water vapor, so as to improve the technical problems of the peristaltic pump in the prior art, such as the complex structure and high maintenance cost.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides a quantitative liquid inlet device suitable for online chemical analysis of water vapor, comprising: a liquid reservoir, a transfer device, a first electrically controlled valve, a second electrically controlled valve, a liquid level detection component and a controller; the liquid reservoir is provided with a liquid outlet on its bottom wall; the transfer device has a liquid storage chamber, and the top wall of the liquid storage chamber is lower than the liquid reservoir, and the bottom of the liquid storage chamber is provided with a liquid inlet and a liquid outlet, the liquid inlet is connected to the liquid outlet through a liquid inlet pipe; the liquid outlet is connected to the reaction tank through a liquid outlet pipe, and the height is higher than the height of the liquid level in the reaction tank; the first electrically controlled valve controls the on-off of the liquid inlet pipe; the second electrically controlled valve controls the on-off of the liquid outlet pipe; the liquid level detection component is provided on the transfer device to detect the liquid in place status in the liquid storage chamber; the controller is electrically connected to the first electrically controlled valve, the second electrically controlled valve and the liquid level detection component respectively.

[0005] In an example of the quantitative liquid feeding device of the present invention, a liquid level regulating component is further provided in the liquid storage chamber to adjust the capacity of the liquid in the liquid storage chamber.

[0006] In an example of the quantitative liquid inlet device of the present invention, the liquid level adjustment assembly includes a float and a float limiter. The float limiter is arranged on the inner wall of the liquid storage chamber and is adjustable along the height direction of the inner wall of the liquid storage chamber. The float limiter is provided with an air circulation hole connecting the inside and outside of the liquid storage chamber; the float floats on the liquid surface between the float limiter and the bottom wall of the liquid storage chamber, and the float can be sealed and abutted against the air circulation hole.

[0007] In an example of the quantitative liquid feeding device of the present invention, the liquid storage chamber is a perspective structure, and scale lines for measuring the volume of the liquid are provided on the side walls of the liquid storage chamber.

[0008] In an example of the quantitative liquid feeding device of the present invention, an internal thread is provided on the inner wall of the liquid storage chamber, and an external thread is provided on the outer wall of the float limiter. The float limiter is movably connected to the inner wall of the liquid storage chamber through the thread.

[0009] In an example of the quantitative liquid feeding device of the present invention, the float limiter is sealed and connected to the inner wall of the liquid storage chamber via a tapered thread.

[0010] In an example of the quantitative liquid feeding device of the present invention, a groove is provided on the upper surface of the float limiter, and the groove is engaged with a screwdriver.

[0011] In an example of the quantitative liquid inlet device of the present invention, the liquid level detection component is a magnetic induction ring, which is movably mounted on the outer wall of the liquid storage chamber, and the installation height is consistent with the installation height of the float limiter; the float contains magnetic material, and the magnetic induction ring sends a liquid inlet signal to the controller by sensing the position of the float.

[0012] In an example of the quantitative liquid inlet device of the present invention, a liquid sensor is provided on the liquid discharge pipe to detect whether liquid is flowing in the liquid discharge pipe, and the liquid sensor is electrically connected to the controller.

[0013] In an example of the quantitative liquid inlet device of the present invention, a liquid storage part and a detection part are provided on the liquid discharge pipe, one end of the liquid storage part is connected to the liquid discharge port, and the other end is connected to the detection part, the detection part is horizontally arranged, and the height of the detection part is flush with the 0 scale line on the liquid storage chamber, and the liquid storage part is arranged lower than the detection part.

[0014] The present invention provides a quantitative liquid inlet device suitable for online water vapor chemical analysis. By providing a transfer device, liquid in a liquid reservoir can be quantitatively transported into a liquid storage chamber under the action of gravity, and then flow into a reaction tank through a liquid discharge port at the bottom. During this quantitative liquid delivery process, no additional power source is required, resulting in a simple structure and low cost. A controller also controls a first electrically controlled valve, a second electrically controlled valve, and a liquid level detection element to achieve automatic quantitative delivery of liquid from the liquid reservoir to the reaction tank. During the quantitative liquid delivery process, the liquid inlet and discharge pipes of this device are not subjected to additional compression during operation, resulting in a relatively long service life and the need for frequent replacement, which reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure of a quantitative liquid feeding device in one embodiment of the present application;

[0017] Figure 2 This is a top view of the local structure of the transfer device in an embodiment of the present application.

[0018] Component number description

[0019] 1. Quantitative liquid inlet device; 11. Liquid reservoir; 111. Liquid outlet; 12. Transfer device; 121. Liquid storage chamber; 1211. Scale line; 1212. Internal thread; 122. Liquid inlet; 123. Liquid discharge port; 124. Liquid level adjustment assembly; 1241. Float; 1242. Float limiter; 12421. Air circulation hole; 12422. External thread; 12423. Groove; 13. Liquid inlet pipe; 14. Liquid discharge pipe; 141. Liquid storage unit; 142. Detection unit; 143. Liquid discharge unit; 15. First electrically controlled valve; 16. Second electrically controlled valve; 17. Liquid level detection unit; 18. Liquid sensor; 2. Reaction pool. DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following examples and the features in the examples can be combined with each other unless they conflict. It should also be understood that the terms used in the examples of the present invention are for the purpose of describing specific embodiments, not for the purpose of limiting the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0021] When numerical ranges are given in the examples, it should be understood that unless otherwise specified herein, both endpoints of each numerical range and any value between the two endpoints may be used. Unless otherwise defined, all technical and scientific terms used herein are consistent with the prior art as understood by those skilled in the art and the description of the present invention. Any prior art methods, devices, and materials similar or equivalent to those described in the examples of the present invention may also be used to implement the present invention.

[0022] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0023] See also Figures 1 to 2 The present invention provides a quantitative liquid feeding device 1, which uses a transfer device 12 to allow the liquid in the liquid reservoir 11 to enter the liquid storage chamber 121 in a quantitative manner under the action of gravity. The liquid in the liquid storage chamber 121 automatically flows into the reaction pool 2 set at a lower position under the action of gravity. The structure is simple and does not require electric energy to achieve liquid transportation. The manufacturing cost and operating cost are relatively low; and under the electrical control of the controller (not shown in the figure), the liquid in the liquid reservoir 11 can also be automatically and quantitatively transported to the reaction pool 2.

[0024] See also Figure 1The present invention provides a quantitative liquid inlet device 1 suitable for online chemical analysis of water vapor, comprising: a liquid reservoir 11, a transfer device 12, a liquid inlet pipe 13, a liquid discharge pipe 14, a first electrically controlled valve 15, a second electrically controlled valve 16, a liquid level detection element 17 and a controller; the shape of the liquid reservoir 11 can be any shape that can accommodate liquid, such as a cylinder, a rectangular parallelepiped, etc., and a liquid outlet 111 is processed on the lowest surface of the bottom wall of the liquid reservoir 11; the transfer device 12 is formed with a liquid storage chamber 121, and the top wall of the liquid storage chamber 121 is lower than the lowest surface of the bottom wall of the liquid reservoir 11; the shape of the liquid storage chamber 121 can be any shape that can accommodate liquid, such as a cylinder, a rectangular parallelepiped, etc. In this embodiment, in order to facilitate processing and manufacturing, Preferably, the liquid storage chamber 121 is set to be cylindrical; a liquid inlet 122 and a liquid discharge port 123 are processed on the bottom wall of the liquid storage chamber 121, and the liquid inlet 122 is connected to the liquid outlet 111 through the liquid inlet pipe 13; the liquid discharge port 123 is connected to the reaction tank 2 through the liquid discharge pipe 14, and the height of the liquid discharge port 123 is higher than the highest height of the liquid level in the reaction tank 2; wherein the liquid discharge pipe 14 and the liquid inlet pipe 13 can be a hose or a hard pipe, preferably, the liquid inlet pipe 13 and the liquid inlet 122, and the liquid discharge pipe 14 and the liquid discharge port 123 are required to be sealed, which can reduce the overflow and leakage at the liquid inlet 122 and the liquid discharge port 123 during the liquid delivery process, which affects the accuracy of the liquid delivery; the first electric control valve 15 controls To control the on-off of the liquid inlet pipe 13, the first electrically-controlled valve 15 can be arranged at the liquid outlet 111 of the liquid reservoir 11, or at the liquid inlet 122 of the liquid storage chamber 121, or on the liquid inlet pipe 13; preferably, in this embodiment, the first electrically-controlled valve 15 is arranged on the liquid inlet pipe 13, and is close to one end of the liquid inlet 122; such an arrangement facilitates the installation and connection of the first electrically-controlled valve 15, and is easy to control the timeliness of the liquid inlet on-off, thereby improving the liquid inlet accuracy; the second electrically-controlled valve 16 controls the on-off of the liquid discharge pipe 14, and the second electrically-controlled valve 16 can be arranged at the liquid discharge port 123 of the liquid storage chamber 121, or on the liquid discharge pipe 14; preferably, in this embodiment, the second electrically-controlled valve 16 is arranged on the liquid discharge pipe 14, and close to one end of the drain port 123; such a configuration facilitates the installation and connection of the second electrically controlled valve 16, and is easy to control the timeliness of the drain on and off, thereby improving the accuracy of liquid discharge; the liquid level detection component 17 is installed on the transferor 12 to detect the liquid in place in the liquid storage chamber 121, and the installation method can be any connection and fixing method such as snap connection and threaded connection. The liquid level detection component 17 can be installed on the inner wall of the liquid storage chamber 121, or on the outer wall of the liquid storage chamber 121; the controller can be set on the transferor 12, or at any other operable display position, and the first electrically controlled valve 15, the second electrically controlled valve 16 and the liquid level detection component 17 are all electrically connected to the controller.

[0025] When the quantitative liquid inlet device 1 is working, the controller controls the first electrically controlled valve 15 to open, and the liquid flows from the liquid reservoir 11 set at the upper position through the liquid inlet pipe 13 through the liquid outlet 111 to the liquid inlet 122 in the lower liquid storage chamber 121, and then enters the liquid storage chamber 121. When the liquid level detection member 17 detects that the liquid in the liquid storage chamber 121 reaches the set capacity, the liquid level detection member 17 sends a signal to the controller, and the controller controls the first electrically controlled valve 15 to close, stop the liquid from entering the liquid storage chamber 121, and complete the quantitative liquid storage in the liquid storage chamber 121. At the same time, the controller controls the second electrically controlled valve 16 to open, and the liquid in the liquid storage chamber 121 enters the drain pipe 14 through the drain port 123, and flows into the reaction tank 2 set at the lower position through the drain pipe 14; when the second electrically controlled valve 16 runs to the set time value (the liquid in the liquid storage chamber 121 can be completely discharged within the set time value), the electric signal is fed back to the controller, and the controller controls the second electrically controlled valve 16 to close, thereby completing a quantitative delivery of the liquid in the liquid reservoir 11 to the reaction tank 2, and this cycle is repeated until multiple quantitative automatic delivery of liquid is completed. The quantitative liquid feeding device 1 is set at a height difference between the liquid reservoir 11, the transfer device 12 and the reaction tank 2, so that the liquid forms a flow from a high place to a low place under the action of its own weight, which simplifies the overall structure of the device and reduces the cost. At the same time, by setting a controller to control the first electrically controlled valve 15, the second electrically controlled valve 16 and the liquid level detection member 17, the liquid in the liquid reservoir 11 is automatically and quantitatively delivered to the reaction tank 2.

[0026] See also Figure 1 In one example of the quantitative liquid feeding device 1 of the present invention, a liquid level adjustment assembly 124 is further provided within the liquid storage chamber 121 to adjust the liquid capacity within the liquid storage chamber 121. The liquid level adjustment assembly 124 can be a float-type liquid level control structure, a static pressure-type liquid level control structure, or any other structure capable of controlling the liquid level within the liquid storage chamber 121 and, thereby, controlling the liquid capacity. This configuration enables the liquid storage chamber 121 to meet the requirements of different quantitative liquid supply values, thereby expanding the scope of application of the liquid storage chamber 121.

[0027] See also Figure 1 and Figure 2In an example of the quantitative liquid feeding device 1 of the present invention, the liquid level adjustment component 124 includes a float 1241 and a float stopper 1242. The float stopper 1242 is installed on the inner wall of the liquid storage chamber 121. The installation method includes but is not limited to a threaded connection. The float stopper 1242 can be adjusted up and down along the height direction of the inner wall of the liquid storage chamber 121. The outer wall of the float stopper 1242 is cylindrical and matches and abuts against the inner wall of the liquid storage chamber 121. An air circulation hole 12421 is opened on the upper surface of the float stopper 1242 through the thickness direction. The inner and outer cavities of the liquid storage chamber 121 are Air flow is achieved through the air circulation hole 12421, and the cross-sectional shape of the air circulation hole 12421 can be any shape such as circular, triangular or long strip; the float 1241 floats on the liquid surface between the float limiter 1242 and the bottom wall of the liquid storage chamber 121, and the float 1241 can be sealed and abutted against the lower surface of the float limiter 1242 after floating into position. The cross-sectional area of the float 1241 is smaller than the cross-sectional area of the liquid storage chamber 121, and the cross-sectional shape of the float 1241 can be any shape such as circular, rectangular, etc. that can make the float 1241 float on the liquid surface. When a fixed amount of liquid needs to be added to the liquid storage chamber 121, the float stopper 1242 is first moved to adjust the set liquid volume of the liquid storage chamber 121. Liquid then enters the liquid storage chamber 121, and the float 1241 rises as the liquid level increases. Simultaneously, air within the liquid storage chamber 121 is discharged outside the liquid storage chamber 121 through the air circulation hole 12421, reducing the gas pressure during the float 1241's ascent. When the float 1241 rises to abut against the bottom surface of the float stopper 1242 and the float 1241 is pressed against the air circulation hole 12421, the space between the float stopper 1242 and the bottom wall of the liquid storage chamber 121 is filled with a fixed amount of liquid, completing the fixed amount of liquid in the liquid storage chamber 121. Subsequently, the liquid level detection element 17 sends a feedback signal to the controller, which controls the first electrically controlled valve 15 to close, stopping the flow of liquid into the liquid storage chamber 121. When the liquid is discharged, the float 1241 moves downward as the liquid level drops, and disengages from the air circulation hole 12421. Air enters the liquid storage chamber 121 again from the air circulation hole 12421, destroying the vacuum state in the liquid storage chamber 121, which is conducive to the smooth discharge of the liquid in the liquid storage chamber 121.

[0028] See also Figure 1 In one example of the quantitative liquid inlet device 1 of the present invention, the liquid storage chamber 121 is a see-through structure, and scale lines 1211 for measuring liquid volume are provided on the sidewalls of the liquid storage chamber 121. The liquid storage chamber 121 can be entirely made of a see-through material, such as glass or PPT, or only the side of the sidewall of the liquid storage chamber 121 marked with scale lines 1211 can be see-through, without specific limitation. This arrangement facilitates adjustment of the liquid level adjustment assembly 124 and allows for more precise adjustment of the liquid level limit height.

[0029] See also Figure 1 In one example of the quantitative liquid inlet device 1 of the present invention, the inner wall of the liquid storage chamber 121 is machined with internal threads 1212, the height of which matches the scale height of the liquid storage chamber 121. The outer wall of the float stopper 1242 is provided with external threads 12422, which correspond to the internal threads 1212. The float stopper 1242 is adjusted up and down on the inner wall of the liquid storage chamber 121 through the screw drive of the threads. This arrangement provides a simple connection structure and facilitates adjustment.

[0030] See also Figure 1 In one example of the quantitative liquid inlet device 1 of the present invention, the float stopper 1242 is sealed to the inner wall of the liquid storage chamber 121 via a tapered thread. The tapered thread improves the sealing performance between the float stopper 1242 and the inner wall of the liquid storage chamber 121. During the process of liquid entering the liquid storage chamber 121, the good sealing performance between the float stopper 1242 and the inner wall of the liquid storage chamber 121 can ensure that the pressure in the liquid storage chamber 121 is consistent with the pressure in the liquid reservoir 11. When the float 1241 abuts the air circulation hole 12421 on the float stopper 1242, the liquid cannot further enter the liquid storage chamber 121, thereby further improving the accuracy of the liquid volume in the liquid storage chamber 121.

[0031] See also Figure 1 and Figure 2 In one example of the quantitative liquid inlet device 1 of the present invention, the upper surface of the float stopper 1242 is provided with a groove 12423, which engages with a screwdriver. Groove 12423 can be a straight-line, cross-shaped, or other internal or external hexagonal shape, as long as it matches the working portion of the corresponding screwdriver. The provision of groove 12423 greatly facilitates the vertical adjustment of the float stopper 1242 on the inner wall of the liquid storage chamber 121.

[0032] See also Figure 1 and Figure 2In one example of the quantitative liquid inlet device 1 of the present invention, the liquid level detection member 17 is a magnetic induction ring that is movably mounted on the outer wall of the liquid storage chamber 121. The mounting method can be a movable snap connection, a threaded connection, or any other method that can be adjusted up and down along the outer wall of the liquid storage chamber 121. The upper end surface of the magnetic induction ring is always flush with the lower end surface of the float stop 1242. The float 1241 contains magnetic material, which can be embedded in the outer wall of the float 1241 or sealed inside the float 1241. When the float 1241 abuts the float stop 1242, the magnetic induction ring can magnetically sense the position of the float 1241 and feed this information back to the controller, which controls the first electrically controlled valve 15 to close in a timely manner. The position height of the float 1241 is determined by magnetic induction between the magnetic induction ring and the float 1241. This method has a simple structure, high control accuracy, and low cost.

[0033] See also Figure 1 In an example of the quantitative liquid inlet device 1 of the present invention, a liquid sensor 18 is connected to the discharge pipe 14, and the liquid sensor 18 is electrically connected to the controller. The liquid sensor 18 can be connected at any position along the length of the discharge pipe 14. When the liquid is discharged, the liquid sensor 18 can sense the flow of liquid in the discharge pipe 14, indicating that the liquid in the liquid reservoir 11 has not been completely discharged. When the liquid is completely discharged, there is no longer any liquid flowing in the discharge pipe 14, so the liquid sensor 18 cannot detect the flow of liquid. At this time, the liquid sensor 18 feeds back a signal to the controller, and the controller controls the second electrically controlled valve 16 to close in time. By providing the liquid sensor 18, the second electrically controlled valve 16 can be automatically closed in time, which facilitates the control of the second electrically controlled valve 16 and improves timeliness. At the same time, when blockage occurs during the discharge of liquid in the discharge pipe 14, when the second electric control valve 16 is open, the liquid sensor 18 detects that no liquid is flowing out, and a signal can be fed back to the controller. The controller can issue an alarm message to promptly remind the operator to check the pipeline fault so that the equipment can continue to operate normally.

[0034] See also Figure 1In an example of the quantitative liquid feeding device 1 of the present invention, the discharge pipe 14 is provided with a liquid storage part 141, a detection part 142 and a discharge part 143 in sequence along the length direction. The liquid storage part 141 is an L-shaped structure, the lower end of the L-shaped structure is connected to the discharge port 123, and the higher end of the L-shaped structure is connected to one end of the detection part 142. The detection part 142 is horizontally arranged, and the lowest point of the inner wall of the pipeline of the detection part 142 is flush with the 0 scale line 1211 on the liquid storage chamber 121. The liquid sensor 18 is horizontally connected to the pipeline of the detection part 142 to detect the liquid flow of the detection part 142; the discharge part 143 is vertically arranged, and the upper end of the discharge part 143 is connected to the end of the detection part 142 away from the liquid storage part 141, and the lower end of the discharge part 143 is connected to the reaction pool 2. During the liquid discharge process, when the liquid sensor 18 detects that there is no liquid flowing in the detection part 142, the liquid sensor 18 feeds back a signal to the controller, and the controller controls the second electrically controlled valve 16 to close, and no more liquid is discharged from the liquid discharge part 143; however, because the lowest point of the inner wall of the pipeline of the detection part 142 is flush with the 0 scale line 1211 on the liquid storage chamber 121, liquid is stored in the pipeline below the scale line 1211 of the liquid storage part 1410 to the entire liquid storage part 141 (that is, before and after the second electrically controlled valve 16); such a setting can prevent the formation of bubbles at the connection between the discharge pipe 14 and the second electrically controlled valve 16, so that the liquid cannot flow at the second electrically controlled valve 16, thereby affecting the normal operation of the device; secondly , because the liquid capacity stored in the pipeline below the scale line 1211 of the liquid storage part 1410 to the entire liquid storage part 141 is constant, the volume of liquid discharged from the liquid storage chamber 121 is equal to the volume of liquid discharged from the discharge part 143, which reduces the phenomenon of uncontrollable liquid loss during each discharge process in the discharge pipe 14, and further improves the accuracy of liquid discharge from the discharge pipe 14; finally, because when the liquid storage chamber 121 is filled with liquid, the front and rear pipelines of the discharge valve are filled with liquid, so that the liquid entering the liquid storage chamber 121 is the liquid inlet volume, avoiding the liquid loss caused by the liquid entering between the second electric control valve 16 and the discharge port 123 during the liquid inlet process, and further improving the liquid inlet accuracy in the liquid storage chamber 121.

[0035] When the quantitative liquid inlet device 1 is used for the first time, the exhaust operation is performed first: the float limiter 1242 is adjusted to the 2mL scale of the liquid storage chamber 121 (it can also be any other scale), the first electrically controlled valve 15 and the second electrically controlled valve 16 are opened, and the liquid in the liquid reservoir 11 begins to enter the liquid storage chamber 121. When liquid flows out of the discharge pipe 14, the second electrically controlled valve 16 is closed; the position of the float limiter 1242 is adjusted up and down. At this time, when the float 1241 is in contact with the float limiter 1242, the scale on the lower surface of the float 1241 is the fixed volume of the liquid inlet of the liquid storage chamber 121. Secondly, the liquid inlet operation: when the liquid is inlet, the controller controls the first electrically controlled valve 15 to open at a fixed time, and the liquid in the liquid reservoir 11 enters the liquid storage chamber 121. The float 1241 rises as the water level in the liquid storage chamber 121 rises. At the same time, the control in the liquid storage chamber 121 is discharged through air circulation. When the float 1241 abuts against the air circulation hole 12421 of the float limiter 1242, the magnetic induction ring senses the arrival signal of the float 1241 and feeds back the signal to the controller. The controller controls the first electrically controlled valve 15 to close, and the liquid inlet is completed. During the final drain operation, after controlling the first electrically controlled valve 15 to close, the controller then controls the second electrically controlled valve 16 to open. The liquid in the liquid storage chamber 121 begins to flow out of the liquid storage chamber 121 through the drain pipe 14 and into the reaction tank 2. At the same time, the float 1241 drops with the liquid level and disengages from the air circulation hole 12421, allowing air to re-enter the liquid storage chamber 121 through the air circulation hole 12421. During the draining process, the liquid sensor 18 continuously detects the liquid flow in the detection section 142. When the liquid sensor 18 detects no liquid flow, it sends a feedback signal to the controller, which controls the second electrically controlled valve 16 to close, ending the draining operation. If the liquid sensor 18 does not detect liquid flow after the drain valve is opened, it indicates that there is a blockage or other fault in the drain pipe 14, requiring on-site drainage. At this time, the liquid sensor 18 sends a feedback signal to the controller, which issues an alarm to allow on-site operators to conduct timely troubleshooting. At the same time, in the controller, the liquid storage volume and liquid inlet volume can be set, and the number of times the first electrically controlled valve 15 is opened can be recorded to calculate the remaining liquid volume in the liquid reservoir 11. When the liquid volume is lower than a certain liquid level, a signal is sent to prompt the operator to replenish the liquid in the liquid reservoir in time.

[0036] The present invention is suitable for a quantitative liquid inlet device 1 for online water vapor chemical analysis. By providing a transfer device 12 and rationally arranging the height difference between the liquid reservoir 11, transfer device 12, and reaction tank 2, the liquid in the liquid reservoir 11 can be quantitatively transferred into the liquid storage chamber 121 under the action of gravity. The liquid in the liquid storage chamber 121 then automatically flows into the reaction tank 2, which is located lower, under the action of gravity. This eliminates the need for electrical energy to transport the liquid, resulting in relatively low manufacturing and operating costs. Furthermore, under the electronic control of a controller, the liquid in the liquid reservoir 11 can be automatically quantitatively transferred into the reaction tank 2. Therefore, the present invention effectively overcomes some practical problems in the prior art and thus has high utility and practical significance. The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by persons of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A quantitative liquid feeding device suitable for online chemical analysis of water vapor, used for quantitatively feeding liquid into a reaction pool, characterized in that: include: a liquid reservoir having a liquid outlet provided on its bottom wall; The transfer device has a liquid storage chamber, and the top wall of the liquid storage chamber is arranged lower than the liquid reservoir; the bottom of the liquid storage chamber is provided with a liquid inlet and a liquid outlet, the liquid inlet is connected to the liquid outlet through a liquid inlet pipe; the liquid outlet is connected to the reaction tank through a liquid outlet pipe, and the height is higher than the height of the liquid level in the reaction tank; A first electrically controlled valve, controlling the opening and closing of the liquid inlet pipe; A second electrically controlled valve, controlling the on-off of the drainage pipe; A liquid level detection member is provided on the transfer device to detect the liquid level in the liquid storage chamber; a controller electrically connected to the first electrically controlled valve, the second electrically controlled valve, and the liquid level detection element, respectively; The liquid storage chamber is also provided with a liquid level adjustment assembly to adjust the capacity of the liquid in the liquid storage chamber; the liquid level adjustment assembly includes a float and a float stopper, the float stopper is provided on the inner wall of the liquid storage chamber and is adjustable in height along the inner wall of the liquid storage chamber, and the float stopper is provided with an air circulation hole communicating with the inside and outside of the liquid storage chamber; The float floats on the liquid surface between the float limiter and the bottom wall of the liquid storage chamber, and the float can be sealed and abutted against the air circulation hole; an internal thread is provided on the inner wall of the liquid storage chamber, and an external thread is provided on the outer wall of the float limiter, and the float limiter is movably connected to the inner wall of the liquid storage chamber by means of a thread; a liquid sensor is provided on the drainage pipe to detect whether there is liquid flowing in the drainage pipe, and the liquid sensor is electrically connected to the controller; a liquid storage part and a detection part are provided on the drainage pipe, one end of the liquid storage part is connected to the drainage port, and the other end is connected to the detection part, the detection part is horizontally arranged, and the height of the detection part is flush with the 0 scale line on the liquid storage chamber, and the liquid storage part is arranged lower than the detection part.

2. The quantitative liquid feeding device according to claim 1, characterized in that: The liquid storage chamber is a perspective structure, and scale lines for measuring liquid volume are arranged on the side walls of the liquid storage chamber.

3. The quantitative liquid feeding device according to claim 1, characterized in that: The float stopper is sealed and connected to the inner wall of the liquid storage chamber via a tapered thread.

4. The quantitative liquid feeding device according to claim 1, characterized in that: The upper surface of the float limiting component is provided with a groove, and the groove is engaged with the screwdriver.

5. The quantitative liquid feeding device according to claim 1, characterized in that: The liquid level detection component is a magnetic induction ring, which is movably mounted on the outer wall of the liquid storage chamber and has an installation height consistent with the installation height of the float limiter; the float contains magnetic material, and the magnetic induction ring sends a liquid level detection signal to the controller by sensing the float position.

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