A sampling mechanism of an SDI tester

Abstract

The utility model relates to the technical field of SDI determination, disclose a kind of sampling mechanism of SDI determination instrument, including box, the inside of the box is separated into sampling room located upper portion and sampling room located lower portion by partition, the inside of the sampling room is equipped with SDI determination instrument, the top of the SDI determination instrument is connected with the main pipe of the oblique upward arrangement, one end of the main pipe is connected with the branch pipe of multiple branches, one end of the branch pipe is connected with multiple sampling tubes of different lengths across the shell of box;The utility model can be aimed at the position of different density suspended particulate matter different, respectively collect water sample of different depth, and after the water sample collection of certain depth, pipeline will be cleaned, residual suspended particulate matter in water sample is washed into membrane box, reduce suspended particulate matter residue, ensure the accuracy of each test.

Description

Technical Field

[0001] This utility model relates to the field of SDI measurement technology, specifically to a sampling mechanism for an SDI measuring instrument. Background Technology

[0002] An SDI meter is an instrument used to determine the SDI (Soil Degradation Index) value in a reverse osmosis system. It measures the degree to which suspended particulate matter in water clogs the filter media. The sampling mechanism of the SDI meter is used to collect and quantify the flow rate attenuation data of water samples as they pass through a standard filter membrane, and then calculate the SDI value to assess the risk of water quality contamination to the reverse osmosis (RO) membrane system.

[0003] A search revealed that patent application number CN202120961923.9 discloses a mobile offline SDI measuring device, comprising a vehicle body, a water tank, and an SDI tester. The water tank is located on the inner side of the upper part of the vehicle body, and a water pump is located on the inner side of the bottom of the vehicle body. An inlet pipe is fixedly connected between the bottom outlet of the water tank and the water pump. The SDI tester is located on the outer side of the upper part of the vehicle body, and an outlet pipe is fixedly connected between the water pump and the inlet of the SDI tester. This utility model has a reasonable and compact structure, is easy to use, and effectively overcomes the limitations of existing water quality SDI measuring devices regarding sampling points and inherent characteristics. It enables mobile offline SDI measurement, providing stable monitoring pressure and flow rate during measurement, improving measurement accuracy, and quickly identifying anomalies in process steps, thus contributing to the stable and high-quality operation of the production system.

[0004] In reverse osmosis systems, different suspended particles have different densities and therefore exist at different depths. However, traditional SDI meters are only equipped with one sampling pipe, meaning they can only collect water samples at a certain depth at a time, which reduces the accuracy of SDI measurement. Therefore, we need to propose a sampling mechanism for SDI meters. Utility Model Content

[0005] The purpose of this invention is to provide a sampling mechanism for an SDI measuring instrument. Through the design of a main pipe, branch pipes, and multiple sampling tubes of different lengths, water samples can be collected at different depths based on the location of suspended particles of different densities. After collecting water samples at a certain depth, the pipes are cleaned to flush the residual suspended particles in the water sample into the membrane box, thereby reducing the residue of suspended particles and ensuring the accuracy of each test, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sampling mechanism for an SDI measuring instrument, comprising a housing, the interior of which is divided into an upper sampling chamber and a lower sampling chamber by a partition, wherein an SDI measuring instrument is installed inside the sampling chamber, and a main pipe inclined upward is connected to the top of the SDI measuring instrument, one end of which is connected to a branch pipe with multiple branches, and one end of the branch pipe passes through the outer shell of the housing and is connected to multiple sampling tubes of different lengths; The sampling room is equipped with a sample collection mechanism, which includes a rotating plate on which multiple sample cups are placed, the number of which is the same as the number of sampling tubes.

[0007] Preferably, the sampling room is also provided with a cleaning mechanism located on the partition. The cleaning mechanism includes a water tank, and a cleaning pipe is connected to the outlet of the water tank. One end of the cleaning pipe is connected to the main pipe.

[0008] Preferably, the SDI measuring instrument includes a water inlet pipe connected to the main pipe, a water inlet ball valve is installed at the upper end of the outer wall of the water inlet pipe, a pressure gauge for monitoring the internal pressure of the water inlet pipe and a pressure regulating valve for adjusting the internal pressure of the water inlet pipe according to the pressure gauge are installed at the middle end of the outer wall of the water inlet pipe.

[0009] Preferably, a membrane box is installed at the lower end of the outer wall of the water inlet pipe. The membrane box includes an upper cover, a lower cover, and a test membrane installed between the upper cover and the lower cover.

[0010] Preferably, the bottom of the water inlet pipe is connected to a frustum-shaped water outlet, which is located above the sample cup.

[0011] Preferably, the sample collection mechanism further includes a motor installed at the bottom of the sampling chamber, one end of the motor's output shaft being connected to a support base, and the rotating plate being installed on the support base.

[0012] Preferably, a positioning block is installed on the surface of the support base, and a positioning groove is opened at the bottom of the rotating plate, with the positioning block engaging inside the positioning groove.

[0013] Preferably, the surface of the rotating plate is provided with a plurality of annularly spaced mounting grooves, and the sample cup is snapped into the inside of the mounting grooves.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the design of a main pipe, branch pipes, and multiple sampling tubes of different lengths, can collect water samples at different depths based on the location of suspended particles of different densities, detect the pollution level of water samples at different depths, and clean the main pipe after collecting water samples at a certain depth to flush the residual suspended particles in the water sample into the membrane box, thereby reducing the residue of suspended particles and ensuring the accuracy of each test. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the SDI measuring instrument, sampling tube, cleaning mechanism, main pipe and branch pipe of this utility model; Figure 3 This is a schematic diagram of the sample collection mechanism of this utility model; Figure 4 This is a schematic diagram of the SDI measuring instrument of this utility model.

[0016] In the diagram: 1. Housing; 2. SDI meter; 21. Inlet pipe; 22. Inlet ball valve; 23. Pressure regulating valve; 24. Pressure gauge; 25. Membrane box top cover; 26. Membrane box bottom cover; 27. Outlet nozzle; 3. Sampling tube; 4. Sample collection mechanism; 41. Motor; 42. Support base; 43. Positioning block; 44. Rotating plate; 45. Mounting slot; 46. Positioning slot; 47. Sample cup; 5. Cleaning mechanism; 51. Water tank; 52. Cleaning pipe; 6. Main pipe; 7. Branch pipe. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-4 This utility model provides a technical solution: a sampling mechanism for an SDI meter, including a housing 1. The bottom of the housing 1 is equipped with casters to facilitate the movement of the device. The interior of the housing 1 is divided into an upper sampling chamber and a lower sampling chamber by a partition. An SDI meter 2 is installed inside the sampling chamber. The top of the SDI meter 2 is connected to a main pipe 6 that is inclined upward. One end of the main pipe 6 is connected to a branch pipe 7 with multiple branches. One end of the branch pipe 7 passes through the outer shell of the housing 1 and is connected to multiple sampling tubes 3 of different lengths, which facilitates the collection of water samples at different depths for suspended particulate matter of different densities. The testing steps for the SDI meter 2 are as follows: First, open the inlet ball valve 22 to rinse the SDI meter 2 and clean any residual impurities in the instrument's pipeline. Then, close the inlet ball valve 22, install the test diaphragm, and appropriately open the inlet ball valve 22 to expel the air from inside the diaphragm box. Next, fully open the inlet ball valve 22 and adjust the pressure of the SDI meter 2 to 207 kPa. Once the pressure is set, immediately close the inlet ball valve 22. Then, push the hand-operated pressure regulating sleeve of the pressure regulating valve back into place and finally fully open the inlet ball valve 22 again. Start timing and measure the time T0 (seconds) required to filter the initial 500ml water sample, then continue filtration; measure the time T required to filter the 500ml water sample after 15 minutes. 15 (Second).

[0019] The formula for calculating SDI is: .

[0020] The sampling room is equipped with a sample collection mechanism 4 for collecting filtered water samples. The sample collection mechanism 4 includes a rotating plate 44, on which multiple sample cups 47 are placed. The number of sample cups 47 is the same as the number of sampling tubes 3. The water sample collected by each sampling tube 3 flows into the corresponding sample cup 47 after being filtered by the test membrane.

[0021] The sampling room is also equipped with a cleaning mechanism 5 located on the partition. The cleaning mechanism 5 includes a water tank 51, a water pump installed at the outlet of the water tank 51, and a cleaning pipe 52 connected to the outlet of the water tank 51. One end of the cleaning pipe 52 is connected to the main pipe 6. After each sampling of water samples at different depths, the residual water sample inside the main pipe 6 is cleaned so that the suspended particulate matter obtained from the sampling is filtered by the test membrane, thereby improving the test accuracy.

[0022] The SDI measuring instrument 2 includes an inlet pipe 21 connected to the main pipe 6. An inlet ball valve 22 is installed on the upper end of the outer wall of the inlet pipe 21. A pressure gauge 24 for monitoring the internal pressure of the inlet pipe 21 is installed on the middle end of the outer wall of the inlet pipe 21. A pressure regulating valve 23 for adjusting the internal pressure of the inlet pipe 21 according to the pressure gauge 24 is also installed.

[0023] A membrane box is installed at the lower end of the outer wall of the inlet pipe 21. The membrane box includes an upper cover 25, a lower cover 26, and a test membrane installed between the upper cover 25 and the lower cover 26. The upper cover 25 and the lower cover 26 are fixed together with bolts. The test membrane needs to be replaced after each sampling of water at different depths.

[0024] The bottom of the inlet pipe 21 is connected to a frustum-shaped outlet 27, which is located above the sample cup 47 to facilitate the delivery of the filtered water sample into the sample cup 47.

[0025] The sample collection mechanism 4 also includes a motor 41 installed at the bottom of the sampling chamber. One end of the output shaft of the motor 41 is connected to a support base 42, and a rotating plate 44 is installed on the support base 42. The motor 41 drives the support base 42 to rotate, the support base 42 drives the rotating plate 44 to rotate, and the rotating plate 44 drives the sample cup 47 to move. The motor 41 drives the rotating plate 44 to rotate 90° each time.

[0026] A positioning block 43 is installed on the surface of the support base 42, and a positioning groove 46 is opened at the bottom of the rotating plate 44. The positioning block 43 is engaged inside the positioning groove 46, realizing the detachable design of the rotating plate 44, which makes it easy to put the rotating plate 44 away.

[0027] The surface of the rotating plate 44 has multiple annularly spaced mounting grooves 45, and the sample cup 47 is snapped into the inside of the mounting groove 45.

[0028] In use, to ensure that water samples of different depths can be collected, multiple sampling tubes 3 of different lengths are placed into the water sample, and the water pump on each sampling tube 3 is turned on individually to collect water samples of different depths in sequence. The water sample enters the main pipe 6 through the corresponding port on the branch pipe 7, and is discharged into the sample cup 47 through the SDI meter 2 (with the inlet ball valve 22 in the open state). During the sampling process, the reading of the pressure gauge 24 is monitored in real time, and the pressure in the inlet pipe 21 of the SDI meter 2 is kept within a constant range through the pressure regulating valve 23. After a water sample is collected from one of the sampling tubes 3, the clean water in the water tank 51 is pumped into the main pipe 6 through the cleaning pipe to clean the water sample remaining on the inner wall of the main pipe 6 during the last sampling. The water sample filtered by the test membrane flows into the sample cup. Then, the motor 41 drives the rotating plate 44 to rotate, which in turn moves the sample cup 47, causing the next sample cup 47 to move below the water outlet 27 and the test membrane to be replaced.

[0029] Then, a water sample is collected from another depth using the second sampling tube 3. The operation process is as described above and will not be repeated here.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sampling mechanism for an SDI meter, characterized by: Includes a housing (1), the interior of which is divided into an upper sampling room and a lower sampling room by a partition. An SDI measuring instrument (2) is installed inside the sampling room. The top of the SDI measuring instrument (2) is connected to a main pipe (6) that is tilted upward. One end of the main pipe (6) is connected to a branch pipe (7) with multiple branches. One end of the branch pipe (7) passes through the outer shell of the housing (1) and is connected to multiple sampling tubes (3) of different lengths. The sampling room is equipped with a sample collection mechanism (4), which includes a rotating plate (44) and multiple sample cups (47) are placed on the rotating plate (44). The number of sample cups (47) is the same as the number of sampling tubes (3).

2. The sampling mechanism of the SDI tester according to claim 1, characterized in that: The sampling room is also equipped with a cleaning mechanism (5) located on the partition. The cleaning mechanism (5) includes a water tank (51), and a cleaning pipe (52) is connected to the outlet of the water tank (51). One end of the cleaning pipe (52) is connected to the main pipe (6).

3. The sampling mechanism of an SDI measuring instrument according to claim 1, characterized in that: The SDI measuring instrument (2) includes an inlet pipe (21) connected to the main pipe (6), an inlet ball valve (22) is installed on the upper end of the outer wall of the inlet pipe (21), a pressure gauge (24) for monitoring the internal pressure of the inlet pipe (21) is installed on the middle end of the outer wall of the inlet pipe (21), and a pressure regulating valve (23) for adjusting the internal pressure of the inlet pipe (21) according to the pressure gauge (24).

4. The sampling mechanism of an SDI measuring instrument according to claim 3, characterized in that: A membrane box is installed at the lower end of the outer wall of the water inlet pipe (21). The membrane box includes a membrane box upper cover (25), a membrane box lower cover (26), and a test membrane installed between the membrane box upper cover (25) and the membrane box lower cover (26).

5. The sampling mechanism of an SDI measuring instrument according to claim 4, characterized in that: The bottom of the water inlet pipe (21) is connected to a frustum-shaped water outlet (27), which is located above the sample cup (47).

6. The sampling mechanism of an SDI measuring instrument according to claim 1, characterized in that: The sample collection mechanism (4) also includes a motor (41) installed at the bottom of the sampling chamber. One end of the output shaft of the motor (41) is connected to a support base (42), and the rotating plate (44) is installed on the support base (42).

7. The sampling mechanism of an SDI measuring instrument according to claim 6, characterized in that: The support base (42) is equipped with a positioning block (43), and the bottom of the rotating plate (44) is provided with a positioning groove (46), and the positioning block (43) is engaged inside the positioning groove (46).

8. The sampling mechanism of an SDI measuring instrument according to claim 1, characterized in that: The surface of the rotating plate (44) is provided with multiple annularly spaced mounting grooves (45), and the sample cup (47) is snapped into the inside of the mounting groove (45).

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