Liquid metering device

Abstract

The utility model discloses a kind of liquid metering devices, including support frame, measuring box, sampling mechanism and storage mechanism, wherein, measuring box is set on support frame, liquid inlet pipe is equipped on measuring box, sampling mechanism is set on measuring box, storage mechanism includes connecting assembly, storage box, discharge assembly, exhaust component and first drive mechanism, wherein, storage box is set on measuring box by connecting assembly, and be located below support frame, discharge assembly is set on storage box, exhaust component is set on storage box, first drive mechanism is set on storage box. Therefore, improve piston movement stability and precision, maintain piston air tightness, cooperate with the guidance flow of multiple one-way valve, reduce liquid volume storage, prestore after liquid sampling and discharge, to improve the measurement precision of liquid.

Description

Technical Field

[0001] This utility model relates to the technical field of metering and sampling equipment, and in particular to a liquid metering device. Background Technology

[0002] Liquid metering devices are used for the precise measurement and delivery of liquids and are widely used in industries such as chemical, pharmaceutical, and food.

[0003] In related technologies, common liquid metering devices include piston type, peristaltic pump type, or gravity type structures. Among them, piston type devices lack guidance, and the seals are prone to eccentric vibration during movement, which aggravates local wear. Peristaltic pump hoses will deform after long-term use, and liquid in the pipe or cavity cannot be completely discharged, resulting in accumulation and affecting metering accuracy. Gravity type is affected by liquid density and viscosity, and it is difficult to guarantee stable metering.

[0004] In actual use, the aforementioned devices generally suffer from technical problems such as insufficient measurement accuracy, liquid residue, and airtightness defects, which affect subsequent measurement and lead to reduced measurement accuracy. Utility Model Content

[0005] This utility model aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, the purpose of this utility model is to propose a liquid metering device that improves the stability and accuracy of piston movement, maintains piston airtightness, and reduces liquid accumulation by cooperating with multiple one-way valves to guide the flow. Liquid is pre-stored after sampling and then discharged, thereby improving the metering accuracy of the liquid.

[0007] To achieve the above objectives, this utility model proposes a liquid metering device, including a support frame, a metering box, a sampling mechanism, and a storage mechanism. The metering box is mounted on the support frame and has an inlet pipe. The sampling mechanism is mounted on the metering box. The storage mechanism includes a connecting assembly, a storage box, a discharge assembly, an venting assembly, and a first driving mechanism. The storage box is mounted on the metering box via the connecting assembly and is located below the support frame. The discharge assembly and the venting assembly are mounted on the storage box. The first driving mechanism is mounted on the storage box.

[0008] In addition, the liquid metering device proposed above according to this utility model may also have the following additional technical features:

[0009] Specifically, the connecting assembly includes a connecting pipe, a rubber valve, and a first one-way valve. The connecting pipe is disposed on the support frame and is connected to the metering box and the storage box respectively. The rubber valve is disposed on the connecting pipe, and the first one-way valve is disposed on the connecting pipe and located below the rubber valve.

[0010] Specifically, the sampling mechanism includes a limiting frame, a second driving component, and a piston. The limiting frame is disposed on the metering box, and the piston is movably connected to the metering box through the second driving component and slides against the inner wall of the metering box.

[0011] Specifically, a second check valve is provided on the inlet pipe, and the second check valve is located near the metering box.

[0012] Specifically, the first drive mechanism includes an air intake pipe, a first drive device, and a third one-way valve. The first drive device is mounted on the storage box via the air intake pipe and is connected to the storage box. The third one-way valve is mounted on the air intake pipe.

[0013] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: The liquid metering device of this utility model, through the second driving component, stably drives the piston to move, thereby improving the negative pressure liquid sampling accuracy of the metering box. Through the synergistic effect of the optimized connecting component, the liquid inlet pipe and multiple one-way valves, the directional flow of liquid is realized, minimizing the liquid accumulation in the pipeline. At the same time, the storage mechanism temporarily stores the sampled liquid in the storage box for observation, and then achieves controllable discharge through active pressurization, thereby improving the liquid metering accuracy.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0016] Figure 1 This is a schematic diagram of the overall structure of the liquid metering device of this utility model;

[0017] Figure 2 This is a half-sectional view of the liquid metering device of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the liquid metering device of this utility model.

[0019] As shown in the figure: 1. Support frame; 2. Metering box; 21. Liquid inlet pipe; 211. Second one-way valve; 3. Sampling mechanism; 31. Limiting frame; 32. Second drive assembly; 33. Piston; 4. Storage mechanism; 41. Connecting assembly; 411. Connecting pipe; 412. Rubber valve; 413. First one-way valve; 42. Storage box; 43. Discharge assembly; 44. Exhaust assembly; 45. First drive mechanism; 451. Air inlet pipe; 452. First drive device; 453. Third one-way valve. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Rather, the embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0021] The liquid metering device of this utility model embodiment will now be described with reference to the accompanying drawings.

[0022] like Figures 1-3 As shown, the liquid metering device of this utility model embodiment may include a support frame 1, a metering box 2, a sampling mechanism 3, and a storage mechanism 4.

[0023] The metering box 2 is mounted on the support frame 1, and the metering box 2 is equipped with an inlet pipe 21. The sampling mechanism 3 is mounted on the metering box 2.

[0024] It should be noted that the support frame 1 described in this embodiment can stably support the metering box 2, the sampling mechanism 3 and the storage mechanism 4. The metering box 2 is made of transparent material and has scales marked on its surface (not shown in the figure), like the graduated cylinder structure in the prior art. The liquid inlet pipe 21 is connected to the bottom of the metering box 2 to facilitate the piston 33 to pressurize and discharge the liquid.

[0025] The storage mechanism 4 includes a connecting component 41, a storage box 42, a discharge component 43, an exhaust component 44, and a first drive mechanism 45.

[0026] The storage box 42 is mounted on the metering box 2 via the connecting component 41 and is located below the support frame 1. The discharge component 43 is mounted on the storage box 42. The exhaust component 44 is mounted on the storage box 42. The first drive mechanism 45 is mounted on the storage box 42.

[0027] It should be noted that the storage box 42 proposed in the above embodiment is also a transparent container with scale markings on the surface. The exhaust component 44 is located on the upper side wall of the storage box 42 and adopts an exhaust pipe and switch valve structure. At the same time, the discharge component 43 adopts a discharge pipe and switch valve structure, which facilitates the control of the discharge of gas and liquid in the storage box 42.

[0028] Specifically, during the actual metering and sampling process, the relevant personnel connect the liquid inlet pipe 21 to an external storage device (not shown in the figure). In the initial state, the piston 33 is located at the bottom of the metering box 2, and the switch valves of the discharge component 43 and the exhaust component 44 are in the closed state.

[0029] During sampling, the second drive assembly 32 drives the piston 33 to rise, creating a negative pressure between the piston 33 and the lower part of the metering box 2. Liquid enters the metering box 2 from the feed pipe and the second one-way valve 211, stabilizing the height of the piston 33, maintaining the airtightness of the piston 33 movement, and observing the markings on the metering box 2 for measurement. Then, the second drive assembly 32 pushes the piston 33 down, causing the liquid to be pressed into the storage box 42 through the connecting assembly 41. At this time, the switch valve on the exhaust assembly 44 can be opened to discharge the gas in the storage box 42. The piston 33 is moved repeatedly to perform sampling operations and pre-store the liquid in the storage box 42, thus realizing liquid metering and sampling.

[0030] When discharging liquid, the switch valve on the exhaust assembly 44 is closed and the switch valve on the discharge assembly 43 is opened. The first drive mechanism 45 is used to pressurize the storage box 42 to discharge the liquid in the storage box 42.

[0031] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the connecting assembly 41 includes a connecting pipe 411, a rubber valve 412, and a first one-way valve 413.

[0032] The connecting pipe 411 is mounted on the support frame 1 and is connected to the metering box 2 and the storage box 42 respectively. The rubber valve 412 is mounted on the connecting pipe 411, and the first one-way valve 413 is mounted on the connecting pipe 411 and located below the rubber valve 412.

[0033] It should be noted that the first one-way valve 413 proposed in the above embodiment can realize the flow from the metering box 2 to the storage box 42, and the rubber valve 412 increases the liquid flow pressure in the connecting pipe 411 while preventing the liquid volume from existing inside the connecting pipe 411.

[0034] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the sampling mechanism 3 includes a limiting frame 31, a second drive assembly 32, and a piston 33.

[0035] The limiting frame 31 is mounted on the metering box 2, and the piston 33 is movably connected to the metering box 2 through the second drive assembly 32 and slides against the inner wall of the metering box 2.

[0036] It should be noted that the second drive assembly 32 described in this embodiment adopts a drive structure of a rotary motor, a stud, a moving plate, and four guide rods. The rotary motor drives the stud to rotate, and the moving plate can be adjusted up and down according to the direction of rotation of the stud. The piston 33 is moved stably through the four guide rods, which are distributed at the four corners of the piston 33. Together with the thread drive of the stud, the airtightness of the piston 33 is increased, thereby improving the liquid collection accuracy.

[0037] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, a second check valve 211 is provided on the inlet pipe 21, and the second check valve 211 is located near the metering box 2.

[0038] It should be noted that the second one-way valve 211 described in this embodiment is used for liquid to enter the metering box 2 through the inlet pipe 21, and the second one-way valve 211 is close to the metering box 2 to prevent liquid from accumulating in the inlet pipe 21.

[0039] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the first drive mechanism 45 includes an intake pipe 451, a first drive device 452, and a third one-way valve 453.

[0040] The first drive device 452 is mounted on the storage box 42 via the air inlet pipe 451 and is connected to the storage box 42. The third one-way valve 453 is mounted on the air inlet pipe 451.

[0041] It should be noted that the first driving device 452 proposed in the above embodiment is an air pump. The air outlet of the air pump is connected to the air inlet pipe 451 and the third one-way valve 453, so that the gas can enter the storage box 42 through the third one-way valve 453 and the air inlet pipe 451 to realize the pressurized discharge of the pre-stored liquid.

[0042] In summary, the liquid metering device of this utility model improves the stability and accuracy of piston movement, maintains piston airtightness, and reduces liquid accumulation by coordinating the flow with multiple one-way valves. Liquid is pre-stored after sampling and then discharged, thereby improving the metering accuracy of the liquid.

[0043] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A liquid metering device, characterized in that, It includes a support frame, a metering box, a sampling mechanism, and a storage mechanism, among which, The metering box is mounted on the support frame, and the metering box is equipped with a liquid inlet pipe; The sampling mechanism is mounted on the metering box; The storage mechanism includes a connecting component, a storage box, a discharging component, an venting component, and a first driving mechanism, wherein, The storage box is mounted on the metering box via the connecting assembly and is located below the support frame; The discharge assembly is mounted on the storage box; The exhaust assembly is disposed on the storage box; The first drive mechanism is disposed on the storage box.

2. The liquid metering device according to claim 1, characterized in that, The connecting assembly includes a connecting tube, a rubber valve, and a first one-way valve, wherein... The connecting pipe is disposed on the support frame and is connected to the metering box and the storage box respectively; The rubber valve is disposed on the connecting tube; The first one-way valve is disposed on the connecting pipe and located below the rubber valve.

3. The liquid metering device according to claim 1, characterized in that, The sampling mechanism includes a limiting frame, a second drive assembly, and a piston, wherein, The limiting frame is disposed on the metering box; The piston is movably connected to the metering box via the second drive assembly and slides against the inner wall of the metering box.

4. The liquid metering device according to claim 1, characterized in that, The inlet pipe is equipped with a second one-way valve, which is located near the metering box.

5. The liquid metering device according to claim 1, characterized in that, The first drive mechanism includes an intake pipe, a first drive device, and a third one-way valve, wherein, The first drive device is mounted on the storage box via the air intake pipe and is connected to the storage box; The third one-way valve is located on the air intake pipe.

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