Aperture measuring device for sand core filter funnel

Abstract

The utility model relates to the technical field of detection and metering equipment, in particular to a device for measuring the aperture of a sand core filter funnel. The sand core filtering funnel and the suction filtration bottle are matched and sleeved together; the electron microscope is vertically arranged on a filter plate at the top of the sand core filtering funnel; the electric full-automatic pressure calibration instrument is hermetically communicated with the side wall of the suction filtration bottle through a ventilation pipeline and is used for pressurizing; the precise three-way valve is arranged on the ventilation pipeline; the digital pressure gauge is connected with the precise three-way valve, and the digital pressure gauge and the electron microscope are both connected with the computer; a layer of purified water thin water film is dropped on a filter plate, then an electric full-automatic pressure calibrator is started to slowly pressurize a suction flask, and the condition that preset bubbles appear on the surface of the filter plate and the pressure value of a digital pressure gauge at the moment are observed through an electron microscope, so that the maximum aperture and the average aperture of the sand core funnel can be calculated; through uncertainty evaluation of the method for measuring the hole diameter of the sand core funnel, the accurate hole diameter of the sand core funnel can be measured.

Description

Technical Field

[0001] This utility model relates to the field of testing and measurement equipment technology, and in particular to a device for measuring the aperture of a sand core filter funnel. Background Technology

[0002] A sand core filter funnel is a commonly used laboratory filtration device, mainly composed of a filter plate, filter membrane, and sand core. It is a tool used to separate and filter precipitates and microorganisms of different particle sizes to clarify liquids. In recent years, due to its high filtration accuracy, fast filtration speed, and ease of operation, sand core filter funnels have been widely used in laboratory research and production in fields such as chemistry, biology, and medicine. In many biological, chemical, and road-related experiments, it is necessary to measure the pore size of the sand core filter funnel. This is because the funnel's diameter and capacity affect the filtration speed, and the capacity determines the amount of liquid that can be processed at one time. However, depending on the application scenario, sand core filter funnels generally have pore sizes ranging from 0.6μm to 30μm. The pore size is relatively small, and the structure is special. The smallest measuring size of the standard gauge blocks used in the industry is 0.5mm, so direct measurement is not possible. We can only rely on the manufacturer's information. However, some experiments require knowledge of the maximum and average pore sizes; otherwise, inaccurate test data due to inaccurate manufacturer-specified pore sizes can have significant consequences. Therefore, there is an urgent need for a device to accurately measure the pore size of the sand core filter funnel filter plate. Utility Model Content

[0003] This utility model discloses a sand core filter funnel aperture measuring device, which aims to solve the technical problems existing in the prior art.

[0004] The present invention adopts the following technical solution:

[0005] A device for measuring the pore size of a sand core filter funnel includes a sand core filter funnel and a suction flask that are fitted together; an electron microscope vertically mounted on the top of the sand core filter funnel for observing the filter plate of the sand core filter funnel; an electric fully automatic pressure calibrator that is sealed to the side wall of the suction flask through a venting pipe for pressurization; a precision three-way valve installed on the venting pipe; and a digital pressure gauge connected to the precision three-way valve for real-time pressure display. The digital pressure gauge and the electron microscope are both connected to a computer, enabling the computer to display simultaneously on the screen the condition of preset bubbles appearing on the surface of the filter plate and the pressure value at that time.

[0006] In some embodiments, the precision three-way valve and the digital pressure gauge are respectively fixed on a fixed support device; the fixed support device includes a horizontal base and a vertical plate connected at right angles, the vertical plate is provided with a horizontal short plate for installing the precision three-way valve and a horizontal long plate for installing the digital pressure gauge, wherein the horizontal short plate is installed on the vertical plate by fasteners.

[0007] In some embodiments, the precision three-way valve is connected to the digital pressure gauge, the electric fully automatic pressure calibrator, and the vacuum filtration flask via the venting pipeline, and a pressure outlet valve is provided on the venting pipeline connected to the vacuum filtration flask.

[0008] In some embodiments, the ventilation pipeline includes a PC material air guide tube and a quick plug that mates with the air guide tube, so that the gas in the entire device is in a sealed state during the measurement process.

[0009] In some embodiments, the connection between the sand core filter funnel and the suction flask is sealed, so that the suction flask is in a sealed state.

[0010] In some embodiments, the electron microscope and the digital pressure gauge are connected to a computer terminal via USB and RS232 interfaces, respectively, and the computer display screen can simultaneously display the preset bubble state and pressure value.

[0011] In some embodiments, the digital pressure gauge is set to grade 0.05 and the measurement range is set to 0 kPa to 40 kPa.

[0012] In some embodiments, the electron microscope and the filtration flask are both mounted on a fixed support unit. The fixed support unit includes a stabilizing block, a vertical rod inserted into the stabilizing block, and two parallel horizontal support rods detachably mounted on the vertical rod. The upper end of the horizontal support rod is provided with a clamping ring for clamping the electron microscope, and the lower end of the horizontal support rod is provided with a clamping ring for clamping the neck of the filtration flask.

[0013] In some embodiments, the horizontal support rod and the vertical rod are connected by a clamping ring unit. The horizontal support rod and the vertical rod are respectively inserted into the horizontal hole and the vertical hole provided in the clamping ring unit. One end of the clamping ring body is also provided with a vertical gap, which is connected to the vertical hole. The end is also provided with a through hole through the gap. After the fastener passes through the through hole and is tightened, the vertical rod is fixedly connected to the clamping ring body.

[0014] In some embodiments, the pore size of the sand core filter funnel is set to 0.6μm~30μm. Beneficial effects

[0015] This utility model discloses a device for measuring the pore size of a sand core filter funnel. Compared with the prior art, this utility model has the following advantages:

[0016] This invention includes a sand core filter funnel and a vacuum filtration flask that are fitted together; an electron microscope vertically mounted on top of the sand core filter funnel for observing the filter plate; an electric fully automatic pressure calibrator sealed to the side wall of the vacuum filtration flask via a venting pipe for pressurization; a precision three-way valve installed on the venting pipe; and a digital pressure gauge connected to the precision three-way valve for real-time pressure display. Both the digital pressure gauge and the electron microscope are connected to a computer, allowing the computer to simultaneously display the appearance of preset bubbles on the filter plate surface and the pressure value at that time. By dripping a layer of pure water of preset thickness onto the filter plate of the sand core filter funnel using a burette, and then slowly pressurizing the vacuum filtration flask by activating the electric fully automatic pressure calibrator, the appearance of preset bubbles on the filter plate surface and the pressure value of the digital pressure gauge are observed through the electron microscope. The maximum and average pore sizes of the sand core filter funnel can be calculated using the Laplace formula. The accuracy of the maximum and average pore size measurements is then determined by the computer's determination of certainty, ensuring the accuracy of the sand core filter funnel pore size measurement. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below, constituting a part of this utility model. The illustrative embodiments of this utility model and their descriptions explain this utility model and do not constitute an improper limitation of this utility model; in the drawings:

[0018] Figure 1 This is a schematic diagram of the technical solution structure disclosed in the embodiments of this utility model;

[0019] Figure 2 for Figure 1 View from direction A;

[0020] Figure 3 This is a schematic diagram of the technical solution for the fixed support device;

[0021] Figure 4 This is a schematic diagram of the technical solution structure of the clamping ring unit.

[0022] In the picture:

[0023] Fixed support unit 1; horizontal support rod 11; vertical rod 12; clamping ring unit 13; horizontal hole 131; vertical hole 132; gap 133; clamping ring body 134; clamping ring 14; stabilizing block 15; electron microscope 2; vacuum filtration flask 3; sand core filter funnel 4; filter plate 41; air passage 5; quick plug 51; air guide tube 52; precision three-way valve 6; fixed support device 7; upright plate 71; horizontal base 72; horizontal short plate 73; short plate mounting hole 731; horizontal long plate 74; long plate mounting hole 741; digital pressure gauge 8; electric fully automatic pressure calibrator 9; computer 10; wire 20; pressure outlet valve 30; fastener 40. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this utility model, it should be noted that the term "comprising" mentioned in the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "a number" refers to more than 3.

[0025] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments; based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] like Figures 1-4 As shown, the technical solution disclosed in this utility model is as follows:

[0028] A sand core filter funnel aperture measuring device includes a sand core filter funnel 4 and a vacuum flask 3 fitted together, an electron microscope 2 vertically mounted on the top of the sand core filter funnel 4 for observing the filter plate 41 of the sand core filter funnel 4, an electric fully automatic pressure calibrator 9 sealed to the side wall of the vacuum flask 3 through a ventilation pipe 5 for pressurization, a precision three-way valve 6 installed on the ventilation pipe 5, and a digital pressure gauge 8 connected to the precision three-way valve 6 to display the pressure value in real time. The digital pressure gauge 8 and the electron microscope 2 are both connected to a computer 10, so that the computer 10 can display the condition of preset bubbles appearing on the surface of the filter plate 41 and the pressure value at that time on the same screen.

[0029] like Figures 1-4 As shown, the preferred embodiment of this utility model is as follows:

[0030] A sand core filter funnel aperture measuring device includes a sand core filter funnel 4 and a vacuum flask 3 fitted together, an electron microscope 2 vertically mounted on the top of the sand core filter funnel 4 for observing the filter plate 41 of the sand core filter funnel 4, an electric fully automatic pressure calibrator 9 sealed to the side wall of the vacuum flask 3 through a ventilation pipe 5 for pressurization, a precision three-way valve 6 installed on the ventilation pipe 5, and a digital pressure gauge 8 connected to the precision three-way valve 6 to display the pressure value in real time. The digital pressure gauge 8 and the electron microscope 2 are both connected to a computer 10, so that the computer 10 can display the condition of preset bubbles appearing on the surface of the filter plate 41 and the pressure value at that time on the same screen.

[0031] In some embodiments, the precision three-way valve 6 and the digital pressure gauge 8 are respectively fixed on a fixed support device 7; the fixed support device 7 includes a horizontal base 72 and a vertical plate 71 connected at right angles. A horizontal long plate 74 and a horizontal short plate 73 are provided in the same direction on the vertical plate 71. The horizontal long plate 74 is a fixed plate, and the horizontal short plate 73 is a movable plate. According to actual needs, they are fixed in a suitable position on the vertical plate 71 by fasteners 40. The precision three-way valve 6 is installed on the horizontal short plate 73, and the digital pressure gauge 8 is installed on the horizontal long plate 74.

[0032] The precision three-way valve 6 is connected to the digital pressure gauge 8, the electric fully automatic pressure calibrator 9 and the vacuum filter bottle 3 respectively through the air supply pipe 5. It can control the air intake flow of the electric fully automatic pressure calibrator 9. A pressure outlet valve 30 is provided on the air supply pipe 5 connected to the vacuum filter bottle 3. The pressure outlet valve 30 controls the gas to enter the vacuum filter bottle 3.

[0033] The fixed support device 7 can fix the standard interface of the precision three-way valve 6 and the digital pressure gauge 8, ensuring stability during the measurement process.

[0034] Pressure measurement standard interface: used to connect pressure measurement standard equipment such as 0.4 grade precision pressure gauge and 0.05 grade digital pressure gauge 8. In this embodiment, 0.05 grade digital pressure gauge 8 is selected, and the gas is air.

[0035] Air source interface: used to connect to a manual pressure pump or an electric fully automatic pressure calibrator; in this embodiment, an electric fully automatic pressure calibrator 9 is selected.

[0036] The ventilation pipe 5 includes a PC material air guide pipe 52 and a rigid quick plug 51 that is connected to the air guide pipe 52. During the measurement process, the gas in the entire device is in a sealed state.

[0037] The connection between the sand core filter funnel 4 and the suction flask 3 is in a sealed state. That is, before placing it, the outer wall of the sand core filter funnel 4 is moistened with water and then screwed into the matching suction flask 3, so that the suction flask 3 is in a sealed state.

[0038] The electron microscope 2 and the digital pressure gauge 8 are connected to the computer 10 terminal via USB and RS232 interfaces, respectively. The computer 10 display screen can simultaneously display preset bubble states and pressure values, such as... Figure 1 , Figure 2 As shown.

[0039] In this embodiment, the digital pressure gauge 8 is set to the 0.05 grade, and the measurement range is set to 0 kPa to 40 kPa; the pore size of the sand core filter funnel 4 and the filter plate 41 is set to 0.6 μm to 30 μm.

[0040] In this embodiment, the fixed support unit 1 includes a stabilizing block 15, a vertical rod 12 inserted into the stabilizing block 15, and two parallel horizontal support rods 11 detachably mounted on the vertical rod 12. The upper end of the horizontal support rod 11 is provided with a clamping ring 14 for clamping the electron microscope 2, and the lower end of the horizontal support rod 11 is provided with a clamping ring 14 for clamping the neck of the vacuum filtration bottle 3.

[0041] In this embodiment, the horizontal support rod 11 and the vertical rod 12 are connected by a clamping ring unit 13. The horizontal support rod 11 and the vertical rod 12 are respectively inserted into the horizontal hole 131 and the vertical hole 132 provided in the clamping ring unit 13. One end of the clamping ring body 134 provided in the clamping ring unit 13 is also provided with a vertical gap 133. The gap 133 communicates with the vertical hole 132. The end of the clamping ring body 134 passes through the gap 133 and is also provided with a through hole. After the fastener 40 passes through the through hole and is tightened, the vertical rod 12 and the clamping ring body 134 are firmly connected. Figure 1 , Figure 4 As shown.

[0042] This sand core filter funnel aperture measuring device can be used to measure the maximum aperture and average aperture of the filter plate 41 of the sand core filter funnel 4.

[0043] Specific working process: First, check the airtightness of the experimental measuring device: close the pressure outlet valve 30 leading to the suction flask 3, start the electric fully automatic pressure calibrator 9 and introduce a certain amount of gas. When the digital pressure gauge 8 displays a value of 2.5Pa~1.5kPa, close the precision three-way valve 6 and observe the change in the value of the digital pressure gauge 8. If the pressure change value within 2 minutes is not greater than 1% of the initial pressure value, the airtightness meets the requirements; otherwise, it does not meet the requirements and the system needs to be reconnected until it is qualified.

[0044] A thin film of pure water is dripped from the top of the sand core filter funnel 4 to the filter plate 41 using a burette. The thickness of the water film is set to 1cm to 2cm, and 1cm is selected in this embodiment.

[0045] The electric fully automatic pressure calibrator 9 is started and pressurized steadily and slowly into the filtration flask 3. The surface of the filter plate 41 is observed through the electron microscope 2. When the first bubble appears, the pressure value P1 of the digital pressure gauge 8 is recorded. The process is displayed on the computer 10. The computer 10 calculates the average pressure of the preset number of tests as ΔP1, and converts it to the average value of the maximum pore size using the Laplace formula. .

[0046] When pressure is continuously applied and bubbles appear uniformly on the surface of the filter plate 41, the pressure value P2 of the digital pressure gauge 8 is recorded at this time. The average pressure value of the preset number of tests is calculated as ΔP2; this is then converted into the average value of the uniform pore size. .

[0047] The computer 10 then calculates the certainty of the measurements of the maximum and average apertures to ensure the accuracy of the aperture measurement of the sand core funnel.

[0048] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A device for measuring the pore size of a sand core filter funnel, comprising a sand core filter funnel and a suction flask fitted together, an electron microscope vertically mounted on the top of the sand core filter funnel for observing the filter plate of the sand core filter funnel, an electric fully automatic pressure calibrator sealed to the side wall of the suction flask via a venting pipe for pressurization, a precision three-way valve installed on the venting pipe, and a digital pressure gauge connected to the precision three-way valve for real-time pressure display, wherein the digital pressure gauge and the electron microscope are both connected to a computer, enabling the computer to simultaneously display the condition of preset bubbles appearing on the surface of the filter plate and the pressure value at that time.

2. The sand core filter funnel aperture measuring device according to claim 1, characterized in that: The precision three-way valve and the digital pressure gauge are respectively fixed on a fixed support device; the fixed support device includes a horizontal base and a vertical plate connected at right angles, the vertical plate is provided with a horizontal short plate for installing the precision three-way valve and a horizontal long plate for installing the digital pressure gauge, wherein the horizontal short plate is installed on the vertical plate by fasteners.

3. The sand core filter funnel aperture measuring device according to claim 2, characterized in that: The precision three-way valve is connected to the digital pressure gauge, the electric fully automatic pressure calibrator and the vacuum filtration bottle respectively through the air supply line, and a pressure outlet valve is provided on the air supply line connected to the vacuum filtration bottle.

4. The sand core filter funnel aperture measuring device according to claim 3, characterized in that: The ventilation pipeline includes a PC material air guide tube and a quick plug that connects to the air guide tube, so that the gas in the entire device is in a sealed state during the measurement process.

5. The sand core filter funnel aperture measuring device according to claim 1, characterized in that: The connection between the sand core filter funnel and the suction flask is sealed, so that the suction flask is in a sealed state.

6. The sand core filter funnel aperture measuring device according to claim 1, characterized in that: The electron microscope and the digital pressure gauge are connected to a computer terminal via USB and RS232 interfaces, respectively, and the computer display screen can simultaneously display the preset bubble state and pressure value.

7. The sand core filter funnel aperture measuring device according to claim 6, characterized in that: The digital pressure gauge is set to grade 0.05 and the measurement range is set to 0 kPa to 40 kPa.

8. The sand core filter funnel aperture measuring device according to claim 1, characterized in that: The electron microscope and the filtration flask are both mounted on a fixed support unit. The fixed support unit includes a stabilizing block, a vertical rod inserted into the stabilizing block, and two parallel horizontal support rods detachably mounted on the vertical rod. The upper horizontal support rod has a clamping ring for holding the electron microscope, and the lower horizontal support rod has a clamping ring for holding the neck of the filtration flask.

9. The sand core filter funnel aperture measuring device according to claim 8, characterized in that: The horizontal support rod and the vertical rod are connected by a clamping ring unit. The horizontal support rod and the vertical rod are respectively inserted into the horizontal hole and the vertical hole on the clamping ring body of the clamping ring unit. One end of the clamping ring body is also provided with a vertical gap, which is connected to the vertical hole. The end is also provided with a through hole through the gap. After the fastener passes through the through hole and is tightened, the vertical rod is fixedly connected to the clamping ring body.

10. The sand core filter funnel aperture measuring device according to claim 1, characterized in that: The pore size of the sand core filter funnel is set to 0.6μm~30μm.

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