A moisture meter quantitative tube assembly

Abstract

This utility model relates to the field of moisture analyzer technology and discloses a quantitative tube assembly for a moisture analyzer, including a quantitative tube; the quantitative tube is disposed inside a quantitative tube protective cover; a liquid outlet connector is installed at the output end of the quantitative tube protective cover; the lower end of the quantitative tube protective cover is threadedly connected to a lower pressure cap; the quantitative tube is clamped between the liquid outlet connector and the lower pressure cap; a piston assembly is provided inside the quantitative tube; the piston assembly includes a piston part one, a piston part two, and a piston push rod; the rear end face of piston part one and the front end face of piston part two are sealed and abutted; multiple evenly distributed annular inner grooves are provided on the outer circumferential surface of piston part two, and sealing gaskets are installed in the annular inner grooves; piston part one and piston part two are tightly fitted to the inner wall of the quantitative tube; piston part two and piston push rod are threadedly screwed together; the lower end of the piston push rod extends to the outside of the quantitative tube and the quantitative tube protective cover. This application has the advantages of improving sealing performance, enhancing structural stability, and improving measurement accuracy through the multi-stage sealing of the piston assembly.

Description

Technical Field

[0001] This utility model relates to the field of moisture meter technology, specifically to a quantitative tube assembly for a moisture meter. Background Technology

[0002] In many fields such as chemical engineering, pharmaceuticals, food processing, and scientific research, moisture analyzers are key equipment. Their core function is to accurately and quickly determine the moisture content of samples, playing an irreplaceable role in ensuring product quality, controlling production processes, and conducting scientific research. Among these components, the quantitative tube assembly is the crucial unit for achieving high-precision quantitative liquid dispensing in the moisture analyzer, and its performance and reliability directly determine the accuracy of the final analytical results. However, existing quantitative tube assemblies have several shortcomings. The sealing performance of existing quantitative tubes is unstable, leading to frequent liquid leaks during actual measurements. When liquid flows along the tube wall or push rod, especially corrosive or volatile liquids such as organic solvents, strong acids, and strong alkalis, it not only contaminates the instrument and experimental environment but also poses a potential threat to the health of operators. More seriously, such leaks can cause measurement deviations, reduce measurement accuracy, and consequently affect the entire production or experimental process and results. Utility Model Content

[0003] The purpose of this invention is to provide a quantitative tube assembly for a moisture meter to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] A quantitative tube assembly for a moisture meter includes a quantitative tube; the quantitative tube is disposed inside a quantitative tube protective cover; a liquid outlet connector is installed at the output end of the quantitative tube protective cover; the lower end of the quantitative tube protective cover is threadedly connected to a lower pressure cap; the quantitative tube is clamped between the liquid outlet connector and the lower pressure cap; a piston assembly is provided inside the quantitative tube; the piston assembly includes a piston part one, a piston part two, and a piston push rod; the rear end face of piston part one and the front end face of piston part two are sealed and abutted; a plurality of evenly distributed annular inner grooves are provided on the outer peripheral surface of piston part two, and sealing gaskets are installed in the annular inner grooves; piston part one and piston part two are tightly fitted to the inner wall of the quantitative tube; piston part two and piston push rod are threadedly connected; the lower end of piston push rod extends to the outside of the quantitative tube and the quantitative tube protective cover.

[0006] In one feasible implementation, a protective cover for the metering tube is disposed on the outside of the metering tube to protect it.

[0007] In one feasible implementation, the pressure cap is located at the bottom of the metering tube to prevent liquid leakage.

[0008] In one feasible implementation, one end of the liquid outlet connector extends to the outside of the metering tube protective cover; the other end of the liquid outlet connector is provided with a liquid outlet connector sealing ring at the connection between it and the metering tube protective cover.

[0009] In one feasible implementation, the lower end of the metering tube protective cover is provided with an internal thread; the lower pressure cover is provided with an external thread.

[0010] In one feasible implementation, the rear end face of piston part one is further provided with a lower annular step surface; the front end face of piston part two is provided with an outwardly extending annular step; a sealing ring is sleeved between the annular step and the lower annular step surface.

[0011] In one feasible implementation, piston part one and piston part two are made of corrosion-resistant material.

[0012] In one feasible implementation, the ball at the lower end of the piston rod is inserted into the circular groove of the moisture meter.

[0013] In one feasible implementation, a positioning annular protrusion is provided at the end away from the output end of the quantitative tube protective cover; the quantitative tube protective cover is pressed tightly onto the top surface of the positioning annular protrusion and fastened onto the quantitative tube seat of the moisture meter.

[0014] In one feasible implementation, the metering tube protective cover cap has internal threads; the positioning annular protrusion has external threads.

[0015] In one feasible implementation, a metering tube protective cover is used to secure the metering tube protective cover.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention provides a quantitative tube assembly for a moisture meter, which, through multi-stage sealing of the piston assembly, has the advantages of improving sealing performance, enhancing structural stability, and increasing measurement accuracy. Attached Figure Description

[0018] Figure 1 This is an exploded view of the structure of a quantitative tube assembly for a moisture meter according to this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of a quantitative tube assembly for a moisture meter according to this utility model;

[0020] Figure 3 This is a schematic diagram of the piston assembly of a moisture meter quantitative tube assembly according to the present invention.

[0021] Figure 4 This is an exploded view of the piston assembly structure of a quantitative tube assembly for a moisture meter according to this utility model.

[0022] Figure 5This is a schematic diagram of the piston part two of the quantitative tube assembly of a moisture meter according to this utility model;

[0023] Figure 6 This is a schematic diagram of the piston push rod of a quantitative tube assembly for a moisture meter according to this utility model.

[0024] Among them, the metering tube-1, metering tube protective cover-2, liquid outlet connector-3, liquid outlet connector sealing ring-4, lower pressure cap-5, piston assembly-6, metering tube protective cover pressure cap-7, positioning annular protrusion-21, piston part one-61, piston part two-62, piston push rod-63, lower annular step surface-611, annular inner groove-621, sealing gasket-622, and annular step-623 are all included. Detailed Implementation

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a full understanding of the implementation of embodiments of the present invention. Example 1

[0026] See Figures 1-6 In one embodiment of this application, a quantitative tube assembly for a moisture meter includes a quantitative tube 1. A quantitative tube protective cover 2 is disposed on the outside of the quantitative tube 1 to isolate the external environment from direct contact with the quantitative tube 1 and protect the quantitative tube 1. A liquid outlet connector 3 is installed at the output end of the quantitative tube protective cover 2. The liquid outlet connector 3 is connected to a liquid outlet pipe for discharging liquid from the quantitative tube 1. One end of the liquid outlet connector 3 extends to the outside of the quantitative tube protective cover 2. A liquid outlet connector sealing ring 4 is provided at the connection between the other end of the liquid outlet connector 3 and the quantitative tube protective cover 2 to prevent liquid from seeping out from the connection of the liquid outlet connector 3, eliminating measurement system errors caused by liquid leakage, and ensuring the data accuracy of the moisture meter under continuous liquid addition conditions.

[0027] The lower end of the metering tube protective cover 2 has an internal thread; the lower pressure cap 5 has an external thread. When the lower end of the metering tube protective cover 2 is screwed tightly into the lower pressure cap 5, the axial pressure generated during the thread engagement keeps the metering tube 1 continuously clamped between the liquid outlet connector 3 and the lower pressure cap 5. The self-locking characteristic of the threaded connection resists loosening caused by mechanical vibration, preventing seal failure due to component displacement. The lower pressure cap 5 is located at the bottom of the metering tube 1 to prevent liquid leakage. A positioning annular protrusion 21 is provided at the end furthest from the output end of the metering tube protective cover 2. The metering tube protective cover cap 7 has an internal thread, and the positioning annular protrusion 21 has an external thread. By tightening the metering tube protective cover cap 7, it presses against the top surface of the positioning annular protrusion 21 and onto the metering tube holder of the moisture meter. The metering tube protective cover cap 7 is used to secure the metering tube protective cover 2. The metering tube 1 is equipped with a piston assembly 6; the piston assembly 6 includes a first piston part 61, a second piston part 62, and a piston push rod 63; the first piston part 61 and the second piston part 62 are made of corrosion-resistant material, and the rear end face of the first piston part 61 is also provided with a lower annular step surface 611; the front end face of the second piston part 62 is provided with an outwardly extending annular step 623; a sealing ring is fitted between the annular step 623 and the lower annular step surface 611, and the rear end face of the first piston part 61 and the front end face of the second piston part 62 are sealed and abutted; the outer circumferential surface of the second piston part 62 is provided with a plurality of evenly distributed annular inner grooves 621, and a sealing gasket 622 is installed in the annular inner grooves 621; the first piston part 61 and the second piston part 62 are tightly fitted to the inner wall of the metering tube 1; the second piston part 62 and the piston push rod 63 are threadedly connected; the lower end of the piston push rod 63 extends to the outside of the metering tube 1 and the metering tube protective cover 2.

[0028] Insert the sealing ring 4 of the liquid outlet connector into the liquid outlet connector 3, then insert the quantitative tube protective cover 2. Install the piston assembly 6 into the quantitative tube 1, place the quantitative tube 1 inside the quantitative tube protective cover 2, and tighten the lower pressure cap 5 so that the quantitative tube 1 is clamped between the liquid outlet connector 3 and the lower pressure cap 5. The ball at the lower end of the piston push rod 63 is inserted into the circular groove of the moisture analyzer. Tighten the pressure cap 7 of the quantitative tube protective cover so that the pressure cap 7 presses tightly against the top surface of the positioning annular protrusion 21 and onto the quantitative tube seat of the moisture analyzer. When the moisture analyzer is started, the motor of the moisture analyzer controls the piston assembly 6 to move up and down to realize the intake and discharge of reagents. When the piston assembly 6 reciprocates, the sealing ring remains in a stable compressed state within the nested space formed by the annular step 623 and the lower annular step surface 611. The nested stepped structure creates physical limits, which, combined with the compression deformation of the elastic sealing ring, effectively fills the gaps at the contact surfaces. This forms a double sealing mechanism at the contact interface between piston part one 61 and piston part two 62, blocking the penetration path of liquid through the piston contact surface and ensuring that the metering tube 1 maintains stable sealing performance during long-term use. Furthermore, when the pressure changes, the multiple sealing gaskets 622 of piston part two 62 deform to compensate for the tiny gaps between the piston and the tube wall of metering tube 1, preventing liquid from seeping along the push rod surface due to assembly gaps.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A moisture meter quantitative tube assembly, characterized in that, The device includes a metering tube; the metering tube is housed inside a metering tube protective cover; a liquid outlet connector is installed at the output end of the metering tube protective cover; the lower end of the metering tube protective cover is threadedly connected to a lower pressure cap; the metering tube is sandwiched between the liquid outlet connector and the lower pressure cap; a piston assembly is provided inside the metering tube; the piston assembly includes a piston part one, a piston part two, and a piston push rod; the rear end face of the piston part one and the front end face of the piston part two are sealed and abutted; the outer circumferential surface of the piston part two is provided with multiple evenly distributed annular inner grooves, and sealing gaskets are installed in the annular inner grooves; the piston part one and the piston part two are tightly fitted to the inner wall of the metering tube; the piston part two and the piston push rod are threadedly connected; the lower end of the piston push rod extends to the outside of the metering tube and the metering tube protective cover.

2. The moisture meter quantitative tube assembly according to claim 1, characterized in that, One end of the liquid outlet connector extends to the outside of the metering tube protective cover; the other end of the liquid outlet connector is provided with a liquid outlet connector sealing ring at the connection between it and the metering tube protective cover.

3. The moisture meter quantitative tube assembly according to claim 1, characterized in that, The lower end of the quantitative tube protective cover is provided with an internal thread; the lower pressure cover is provided with an external thread.

4. The moisture meter quantitative tube assembly according to claim 1, characterized in that, The rear end face of the piston part one is also provided with a lower annular step surface; the front end face of the piston part two is provided with an outwardly extending annular step; a sealing ring is sleeved between the annular step and the lower annular step surface.

5. The moisture meter quantitative tube assembly according to claim 1, characterized in that, The ball at the lower end of the piston rod is inserted into the circular groove of the moisture meter.

6. The moisture meter quantitative tube assembly according to claim 1, characterized in that, The end away from the output end of the quantitative tube protective cover is provided with a positioning annular protrusion; the quantitative tube protective cover is pressed tightly on the top surface of the positioning annular protrusion and fastened onto the quantitative tube seat of the moisture meter.

7. The moisture meter quantitative tube assembly according to claim 6, characterized in that, The measuring tube protective cover has an internal thread; the positioning annular protrusion has an external thread.

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