Liquid metering device

Abstract

The utility model relates to the field of water quality monitoring, and discloses a liquid metering device which comprises a metal plate frame, a glass tube, sealing assemblies and a metering sensing assembly, a cavity for containing the glass tube is formed in the middle of the metal plate frame, and the two ends of the glass tube are connected into the cavity in a sealed mode through the sealing assemblies. The sealing assembly comprises an upper sealing cover, a lower sealing cover and at least two O-shaped sealing rings, the two ends of the glass tube are embedded into radial sealing grooves of the sealing cover, the O-shaped sealing rings are arranged in the radial sealing grooves and form radial sealing with gaps of the outer wall of the glass tube, and the sensing end of the metering sensing assembly corresponds to the side wall of the glass tube to meter liquid. According to the device, traditional axial sealing is replaced with radial sealing, the glass tube is only subjected to controllable radial pressure, dependence on axial assembly precision is avoided, and the problems that the glass tube is prone to breakage and the device is prone to damage due to traditional axial stress are solved.

Description

Technical Field

[0001] This utility model relates to the field of water quality monitoring, specifically to a liquid metering device. Background Technology

[0002] In the field of water quality monitoring, liquid metering devices are key equipment for accurately measuring parameters such as liquid flow rate and volume. Existing liquid metering devices typically consist of a machined frame, a sensor, a thin-walled glass tube, and an end-face seal. The sealing method involves applying specific axial pressure to make the end-face seal fit against the end face of the thin-walled glass tube.

[0003] However, the existing structure described above has the following drawbacks:

[0004] The overall structure has high assembly complexity and strict requirements for axial assembly dimensional accuracy and axial pressure accuracy. Assembly failure is easily caused by deviations in dimensional or pressure control during the assembly process.

[0005] Thin-walled glass tubes are prone to rupture during assembly or use due to uneven axial force or excessive pressure, which can lead to device damage and metering interruption.

[0006] The O-ring wire diameter in the end face seal is small, and the required compression is extremely small. If the axial assembly dimensions are not properly controlled, it can easily lead to seal failure and liquid leakage, affecting the accuracy of measurement and the safety of the device.

[0007] The components of the device are tightly assembled and rely on axial pressure to maintain the seal. When replacing or cleaning and maintaining components such as glass tubes and seals, the axial pressure structure needs to be disassembled and the assembly dimensions recalibrated, making the maintenance operation cumbersome and time-consuming.

[0008] The high cost of machining the outer frame and the high precision required for assembly lead to an increased scrap rate during production, resulting in a high overall cost for the device. Utility Model Content

[0009] The purpose of this utility model is to provide a liquid metering device that achieves radial sealing of the glass tube through an upper sealing cap, a lower sealing cap, and an O-ring. The glass tube can withstand controllable radial pressure, which can eliminate the dependence on axial assembly accuracy and solve the problem that the glass tube is prone to breakage and the device is prone to damage due to traditional axial force.

[0010] This utility model is achieved through the following technical solution:

[0011] A liquid metering device, comprising:

[0012] A sheet metal frame, wherein a cavity for accommodating a glass tube is formed in the middle of the sheet metal frame;

[0013] A glass tube, the two ends of which are respectively sealed and connected to the cavity of the sheet metal frame by a sealing assembly;

[0014] The sealing assembly includes an upper sealing cap, a lower sealing cap, and at least two O-rings. The two ends of the glass tube are respectively embedded in the radial sealing grooves of the upper sealing cap and the lower sealing cap. The O-rings are disposed in the gap between the radial sealing groove and the outer wall of the glass tube to form a radial seal.

[0015] A metering sensing component, wherein the sensing end of the metering sensing component is disposed corresponding to the side wall of the glass tube, is used to sense and measure the liquid flowing through the glass tube.

[0016] In this solution, a sheet metal frame replaces the traditional machined outer frame as the installation base for the overall device, thereby significantly reducing costs. At the same time, the upper and lower sealing grooves of the upper and lower sealing caps are embedded at both ends of the defined glass tube, and O-rings are placed in the gap between the radial sealing grooves and the outer wall of the glass tube to form a radial seal structure. This achieves a sealing method in which the glass tube bears controllable radial pressure instead of the traditional axial pressure seal, eliminating the dependence on axial assembly precision and thus solving the problem that the glass tube is prone to breakage and the device is prone to damage due to traditional axial force.

[0017] As a further technical solution for the liquid metering device, the sheet metal frame includes a front cover plate, a rear cover plate, and at least two fastening screws. The front cover plate and the rear cover plate are fastened together to form a cavity for accommodating the glass tube. The fastening screws pass through the front cover plate and are threadedly connected to the rear cover plate, so that the front cover plate and the rear cover plate can be laterally clamped. This fixing method, combined with the radial sealing structure of the sealing assembly, provides a stable installation foundation for the glass tube and the sealing assembly, and avoids the influence of axial pressure on the glass tube in the traditional structure.

[0018] As a further technical solution for the liquid metering device, the inner diameter of the radial sealing groove is 0.2 to 0.5 mm larger than the outer diameter of the glass tube, and the cross-sectional diameter of the O-ring is 1.2 to 1.5 times the depth of the radial sealing groove. This avoids sealing failure due to excessive gap or difficulty in assembling the glass tube due to insufficient gap, and further refines the implementation method of radial sealing.

[0019] As a further technical solution for the liquid metering device, the sheet metal frame also includes an upper connecting frame and a lower connecting frame. The upper connecting frame and the lower connecting frame are respectively connected to the upper and lower ends of the rear cover plate. Furthermore, the middle of the upper connecting frame and the lower connecting frame is provided with clearance notches corresponding to the two ends of the glass tube, providing installation and working space for the two ends of the glass tube and the sealing components.

[0020] The front cover plate has a limiting recess on its side for placing the upper connecting frame and the lower connecting frame. The fastening screw passes through the front cover plate and is threadedly connected to the upper connecting frame and the lower connecting frame to ensure uniform lateral clamping force and a stable structure.

[0021] As a further technical solution for the liquid metering device, a positioning plate is provided at the notch of the upper connecting frame. The positioning plate is located in the fastening direction of the front cover plate and the rear cover plate, and a positioning groove matching the positioning plate is provided on the wall surface of the limiting recess. This positioning structure can guide and limit the fastening position of the front cover plate and the rear cover plate during the assembly process, avoid lateral displacement during fastening, and ensure that the cavity formed after the two are fastened can accommodate the glass tube and sealing components.

[0022] As a further technical solution for the liquid metering device, the two ends of the rear cover are connected to limit plates, and the side wall of the limit recess is provided with a limit groove that matches the limit plate. This limit structure can play a lateral guiding and limiting role during the fastening process of the front cover and the rear cover, avoiding left and right displacement during fastening, and ensuring that the cavity formed after the two are fastened is accurately positioned.

[0023] As a further technical solution for the liquid metering device, both the upper sealing cap and the lower sealing cap are provided with a liquid interface at the end away from the glass tube. The liquid interface is connected to the inner cavity of the glass tube, and the axis of the liquid interface is collinear with the axis of the glass tube. This ensures that the liquid maintains smooth axial flow when entering and exiting the glass tube, avoiding liquid turbulence or stagnation caused by interface misalignment, thereby ensuring the accuracy of the metering sensing component in measuring the liquid in the tube.

[0024] As a further technical solution for the liquid metering device, in order to further improve the metering sensitivity and accuracy, the glass tube is a thin-walled glass tube with a wall thickness of 0.5 to 2 mm.

[0025] As a further technical solution for the liquid metering device, the metering sensing component includes a photoelectric sensor, which is connected to the rear cover plate and the sensing end of the photoelectric sensor faces the glass tube to avoid distortion of the metering signal due to sensing position deviation, thereby ensuring the accuracy of the metering.

[0026] As a further technical solution for the liquid metering device, an observation window is provided on the front cover plate. The observation window faces the photoelectric sensor, providing the operator with a channel to directly observe the relative position and working status of the photoelectric sensor and the glass tube, which facilitates the calibration of the sensing position of the photoelectric sensor during the device assembly process.

[0027] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0028] 1. This utility model replaces the traditional axial seal with a radial seal. The radial sealing grooves of the upper and lower sealing caps are embedded at both ends of the glass tube. The O-ring seal forms a seal in the radial gap. The glass tube only bears controllable radial pressure, which eliminates the dependence on axial assembly accuracy and effectively avoids the problems of easy breakage of the glass tube and easy damage of the device caused by traditional axial force. At the same time, the compression of the O-ring seal in the radial sealing structure is easier to control, which solves the problem of liquid leakage caused by insufficient or excessive compression of the O-ring seal in traditional end face seal, and improves the sealing reliability.

[0029] 2. This utility model uses a sheet metal frame to replace the traditional machined outer frame, which greatly reduces manufacturing costs. Furthermore, the lateral clamping structure of the front cover plate, rear cover plate, and fastening screws, combined with the limiting design of the upper and lower connecting frames, simplifies the assembly process, reduces the requirements for assembly accuracy, and solves the problems of complex assembly and high scrap rate caused by the strict control of axial dimensions and pressure accuracy in traditional devices. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a front view structural diagram of the present utility model;

[0032] Figure 2 for Figure 1 A cross-sectional view of the structure marked AA.

[0033] Figure 3 This is a schematic diagram of the exploded structure of this utility model.

[0034] The attached diagram shows the markings and corresponding component names:

[0035] 1-Sheet metal frame, 10-Rear cover plate, 11-Front cover plate, 12-Upper connecting frame, 13-Observation window, 14-Fasting screw, 15-Positioning plate, 16-Positioning groove, 17-Limiting plate, 18-Limiting groove, 19-Lower connecting frame;

[0036] 2-Sealing assembly, 20-Upper sealing cap, 21-First O-ring seal, 22-Lower sealing cap, 23-Second O-ring seal;

[0037] 3-Glass tube, 4-Metering sensing component. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0039] Example 1

[0040] This embodiment 1 provides a liquid metering device, such as... Figures 1-3 As shown, it includes a sheet metal frame 1, a glass tube 3, a sealing assembly 2, and a metering sensing assembly 4;

[0041] Please refer to Figure 1 and Figure 2 As shown, a cavity for accommodating a glass tube 3 is formed in the middle of the sheet metal frame 1, and the two ends of the glass tube 3 are respectively sealed and connected to the cavity of the sheet metal frame 1 by a sealing component 2.

[0042] Specifically, the sheet metal frame 1 serves as the basic support structure for the entire liquid metering device. It includes a front cover plate 11 and a rear cover plate 10. The rear cover plate 10 is a mounting back plate. The front cover plate 11 and the rear cover plate 10 form a cavity to accommodate the glass tube 3 through a snap-fit ​​structure. All fastening screws 14 pass through the front cover plate 11 and are threadedly connected to the rear cover plate 10, so that the front cover plate 11 and the rear cover plate 10 can be laterally clamped.

[0043] To ensure uniform lateral clamping force and structural stability, the sheet metal frame 1 also includes an upper connecting frame 12 and a lower connecting frame 19. The upper connecting frame 12 and the lower connecting frame 19 are respectively connected to the upper and lower ends of the rear cover plate 10 by welding or high-strength bolts. The middle of the upper connecting frame 12 and the lower connecting frame 19 is provided with clearance notches corresponding to the two ends of the glass tube 3, providing installation and working space for the two ends of the glass tube 3 and the sealing components. At the same time, a limiting recess is provided on the side end of the front cover plate 11 to place the upper connecting frame 12 and the lower connecting frame 19. It should be noted that the cavity formed by the front cover plate 11 and the rear cover plate 10 through the fastening structure is provided for the limiting recess. The fastening screw 14 passes through the front cover plate 11 and is threadedly connected to the upper connecting frame 12 and the lower connecting frame 19, so that the front cover plate 11 and the rear cover plate 10 are tightly fastened, forming a closed and precise cavity to accommodate the glass tube 3 between them.

[0044] In this embodiment, to reduce the weight of the glass tube 3 itself and lessen the load on the overall support structure of the device, while also making it easier for the metering sensing component to sense the liquid inside the tube, please refer to [link to relevant documentation]. Figures 2-3 As shown, in this embodiment, glass tube 3 is a thin-walled glass tube with a wall thickness of 0.5 to 2 mm. This thin-walled design can effectively improve the sensitivity and accuracy of measurement.

[0045] Please refer to Figures 2-3As shown, the sealing assembly 2 includes an upper sealing cap 20, a lower sealing cap 22, a first O-ring 21, and a second O-ring 23. The upper sealing cap 20 and the lower sealing cap 22 are respectively located in the corresponding clearance notches in the middle of the upper connecting frame 12 and the lower connecting frame 19, and are limited by the clearance notches. The two ends of the glass tube 3 are respectively embedded in the radial sealing grooves of the upper sealing cap 20 and the lower sealing cap 22. The inner diameter of the radial sealing groove is 0.2 to 0.5 mm larger than the outer diameter of the glass tube 3. The first O-ring 21 is disposed in the gap between the radial sealing groove of the sealing cap 20 and the outer wall of the glass tube 3 to form a radial seal. The second O-ring 23 is disposed in the gap between the radial sealing groove of the lower sealing cap 22 and the outer wall of the glass tube 3 to form a radial seal. Here, in order to avoid the sealing failure due to the gap being too large or the glass tube 3 being difficult to assemble due to the gap being too small, the cross-sectional diameter of all O-rings is 1.2 to 1.5 times the depth of the radial sealing groove.

[0046] Meanwhile, the upper sealing cap 20 and the lower sealing cap 22 are both provided with liquid interfaces at the ends away from the glass tube 3. The liquid interfaces are connected to the inner cavity of the glass tube 3, and the axis of the liquid interfaces is collinear with the axis of the glass tube. This ensures that the liquid maintains smooth axial flow when entering and exiting the glass tube 3, and avoids liquid turbulence or stagnation caused by interface misalignment, thereby ensuring the accuracy of the metering sensing component in measuring the liquid in the tube.

[0047] Please refer to the following: Figures 2-3 As shown, the metering sensing component 4 mainly consists of a photoelectric sensor, which is a high-precision model capable of accurately sensing the liquid flowing through the glass tube 3. The photoelectric sensor is connected to the rear cover plate 10. During installation, it is ensured that the sensing end of the photoelectric sensor is precisely calibrated and aligned with the side wall of the glass tube 3. To ensure the sensing effect, the distance between the sensing end of the photoelectric sensor and the glass tube 3 is rigorously tested and adjusted, generally controlled within a range of no more than 5mm. In addition, an observation window 13 is provided on the front cover plate 11. The observation window 13 is made of high-transmittance glass or transparent plastic material, and its position is directly opposite the photoelectric sensor. The observation window 13 facilitates the operator's calibration of the relative position of the photoelectric sensor and the glass tube 3 during device assembly. At the same time, during the use of the device, the operator can use the observation window 3 to view the liquid flow in the metering area and the working status of the photoelectric sensor in real time, facilitating timely detection of problems and maintenance and adjustment.

[0048] Example 2

[0049] To further improve the accuracy and stability of the engagement between the front cover plate 11 and the rear cover plate 10, this embodiment 2 provides another liquid metering device based on the technical solution of embodiment 1, such as... Figure 3As shown, in this embodiment, a positioning plate 15 is provided at the notch of the upper connecting frame 12. The positioning plate 15 is located in the fastening direction of the front cover plate 11 and the rear cover plate 10. Correspondingly, a positioning groove 16 matching the positioning plate 15 is provided on the wall surface of the limiting recess. During assembly, the positioning plate 15 can be accurately embedded into the positioning groove 16, playing a precise positioning and guiding role, preventing the front and rear cover plates from shifting laterally during the fastening process. At the same time, the positioning groove 16 can also axially limit the upper sealing cover 20. In addition, limiting plates 17 are also connected to both ends of the rear cover plate 10. Limiting grooves 18 matching the limiting plates 17 are provided on the side wall surface of the limiting recess, further enhancing the lateral limiting effect, ensuring the stability of the entire frame structure, and avoiding the impact of component displacement on the accuracy of liquid metering during device operation.

[0050] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A liquid metering device, characterized in that, include: A sheet metal frame (1) has a cavity in the middle for accommodating a glass tube (3). The glass tube (3) is sealed at both ends of the glass tube (3) and connected to the cavity of the sheet metal frame (1) by sealing components (2); The sealing assembly (2) includes an upper sealing cap (20), a lower sealing cap (22) and at least two O-rings. The two ends of the glass tube (3) are respectively embedded in the radial sealing grooves of the upper sealing cap (20) and the lower sealing cap (22). The O-rings are disposed in the gap between the radial sealing groove and the outer wall of the glass tube (3) to form a radial seal. A metering sensing component (4) is provided with its sensing end corresponding to the side wall of the glass tube (3) for sensing and measuring the liquid flowing through the glass tube (3).

2. The liquid metering device according to claim 1, characterized in that, The sheet metal frame (1) includes a front cover plate (11), a rear cover plate (10) and at least two fastening screws (14). The front cover plate (11) and the rear cover plate (10) are fastened together to form a cavity for accommodating the glass tube (3). The fastening screws (14) pass through the front cover plate (11) and are threadedly connected to the rear cover plate (10), so that the front cover plate (11) and the rear cover plate (10) can be laterally clamped.

3. A liquid metering device according to claim 1, characterized in that, The inner diameter of the radial sealing groove is 0.2 to 0.5 mm larger than the outer diameter of the glass tube (3), and the cross-sectional diameter of the O-ring is 1.2 to 1.5 times the depth of the radial sealing groove.

4. A liquid metering device according to claim 2, characterized in that, The sheet metal frame (1) also includes an upper connecting frame (12) and a lower connecting frame (19). The upper connecting frame (12) and the lower connecting frame (19) are respectively connected to the upper and lower ends of the rear cover plate (10), and the middle of the upper connecting frame (12) and the lower connecting frame (19) is provided with clearance notches corresponding to the two ends of the glass tube (3). The front cover plate (11) has a limiting recess on its side end for placing the upper connecting frame (12) and the lower connecting frame (19). The fastening screw (14) passes through the front cover plate (11) and is threadedly connected to the upper connecting frame (12) and the lower connecting frame (19).

5. A liquid metering device according to claim 4, characterized in that, A positioning plate (15) is provided at the notch of the upper connecting frame (12). The positioning plate (15) is located in the fastening direction of the front cover plate (11) and the rear cover plate (10), and a positioning groove (16) matching the positioning plate (15) is provided on the wall surface of the limiting recess.

6. A liquid metering device according to claim 4, characterized in that, The two ends of the rear cover plate (10) are connected to the limiting plate (17), and the side wall of the limiting recess is provided with a limiting groove (18) that matches the limiting plate (17).

7. A liquid metering device according to claim 1, characterized in that, Both the upper sealing cap (20) and the lower sealing cap (22) have a liquid interface at the end away from the glass tube (3). The liquid interface is connected to the inner cavity of the glass tube (3), and the axis of the liquid interface is collinear with the axis of the glass tube (3).

8. A liquid metering device according to claim 1, characterized in that, The glass tube (3) is a thin-walled glass tube with a wall thickness of 0.5 to 2 mm.

9. A liquid metering device according to claim 2, characterized in that, The metering sensing component (4) includes a photoelectric sensor connected to the rear cover plate (10) and the sensing end of the photoelectric sensor is facing the glass tube (3).

10. A liquid metering device according to claim 9, characterized in that, An observation window (13) is provided on the front cover plate (11), and the observation window (13) is directly facing the photoelectric sensor.

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