A liquid level gauge for accurately measuring the liquid level height in a liquid level tube

Abstract

The present invention discloses a liquid level gauge for accurately measuring the liquid level height in a liquid level tube, which is arranged on a standard metal measuring vessel. There is a liquid level tube on the standard metal measuring vessel, and the liquid to be measured is contained in the liquid level tube. It includes a main scale cylinder, the main scale cylinder is sleeved outside the liquid level tube, the main scale cylinder is axially provided with main scale graduations, and a vernier cylinder is also sleeved outside the main scale cylinder. The vernier cylinder is axially provided with vernier scale graduations, and the ends of the main scale graduations are tangent to the vernier scale graduation lines; a main scale cylinder observation window is provided on the main scale cylinder, and a vernier cylinder observation window is provided on the vernier cylinder. The main scale cylinder observation window corresponds to the vernier cylinder observation window. In this way, the liquid level of the liquid to be measured in the liquid level tube can be observed through the vernier cylinder observation window and the main scale cylinder observation window. A aiming and positioning mechanism is also provided on the vernier cylinder, and the aiming and positioning mechanism is arranged on the vernier cylinder observation window. Its advantages are as follows: its structure is simple, the layout is reasonable, the design defects existing in the liquid level measurement of the existing metal measuring vessel are improved, and the influence of systematic error and random error on the measurement result can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level measurement of standard metal measuring vessels, and particularly refers to a liquid level gauge for accurately measuring the liquid level height in a liquid level tube. Background Art

[0002] At present, when measuring the relative height of the liquid level of a standard metal measuring vessel, the vast majority of the used liquid level gauges are modified vernier caliper type liquid level gauges transformed from vernier calipers. This kind of vernier caliper type liquid level gauge removes the original measuring claws of the vernier caliper. There are holes for fixing at both ends of the main scale. An organic glass ring with scale lines is installed on the vernier caliper frame. The scale lines are used to aim at the vertex of the concave liquid level in the liquid level tube, and the relative height of the liquid level is read on the vernier scale. Its resolution is generally 0.02 mm.

[0003] The existing vernier type liquid level gauges have the following problems: The axis of its main scale is not on the same line as the axis of the measured liquid level tube. Although these two axes are arranged in parallel, the distance between the two axes is greater than 25 mm, which does not conform to the Abbe measurement principle that the measurement axis and the measured axis are on the same straight line. The greater the distance between the two axes, the greater the influence on the accuracy of the measurement result; Secondly, the installation randomness of the vernier main scale is relatively large, resulting in the perpendicularity between the main scale and the liquid level in the standard metal measuring vessel not being effectively controlled; Thirdly, the liquid level tube is made of glass, and the exposed installation is prone to breakage under external force impact, posing a relatively large safety hazard; In addition, as the service life of the liquid level gauge extends, some thermally bent organic glass rings may have reduced transparency and crack marks due to reasons such as material aging and internal stress release, affecting the accurate positioning of the liquid level; Thirdly, the width of the positioning scale lines on some organic glass rings does not meet the requirement of being less than 0.25 mm, which does not conform to the provisions of Article 6.2.4 of the National Metrological Verification Regulation JJG 259-2005 "Standard Metal Measuring Vessels"; In addition, there are many uncertain factors in the installation of the existing organic glass rings, and the installation inclination phenomenon is relatively common, resulting in the problem that the plane of the positioning scale lines is not parallel to the liquid plane.

[0004] The foregoing problems have a great impact on the liquid level positioning and measurement in the standard metal measuring vessel, introducing certain systematic errors and random errors. Summary of the Invention

[0005] The purpose of the present invention is to provide a liquid level gauge for accurately measuring the liquid level height in a liquid level tube, which has a simple structure and reasonable layout, improves many design defects existing in the liquid level measurement of existing metal measuring vessels, and can effectively reduce the influence of systematic errors and random errors on the measurement result.

[0006] To achieve the above object, the present invention designs a liquid level gauge for accurately measuring the liquid level height in a liquid level tube, which is arranged on a standard metal measuring vessel. The standard metal measuring vessel is provided with a liquid level tube, and the liquid level tube contains a liquid to be measured with a liquid level height to be measured. It includes a main scale tube, the main scale tube is sleeved outside the liquid level tube, the main scale tube is axially provided with a main scale, and a vernier tube is also sleeved outside the main scale tube. The vernier tube is axially provided with a vernier scale, and the end of the main scale coincides with the end of the vernier scale line; a main scale tube observation window is provided on the main scale tube, and a vernier tube observation window is provided on the vernier tube. In this way, the liquid level of the liquid to be measured in the liquid level tube can be observed through the vernier tube observation window and the main scale tube observation window. A aiming and positioning mechanism is also provided on the vernier tube, and the aiming and positioning mechanism is arranged on the vernier tube observation window.

[0007] Further, the standard metal measuring vessel is provided with an upper mounting seat and a lower mounting seat. The upper mounting seat is arranged at the top of the liquid level tube, and the lower mounting seat is arranged at the bottom of the liquid level tube. The main scale tube is fixed on the standard metal measuring vessel through the upper mounting seat and the lower mounting seat. In this way, by fixing the main scale tube on the standard metal measuring vessel through the upper mounting seat and the lower mounting seat, it can not only play a role in stabilizing the main scale tube, but also play a role in protecting the liquid level tube, avoiding damage to the liquid level tube caused by external force impact, and ensuring the safety of the device.

[0008] Even further, an oil-resistant gasket is provided in the lower mounting seat, and the oil-resistant gasket is arranged between the lower bottom surface of the main scale tube and the lower mounting seat. In this way, it can prevent the liquid to be measured in the standard metal measuring vessel from leaking and affecting the accuracy of the measurement result.

[0009] Further, a sealing ring is also provided in the lower mounting seat, and the sealing ring is arranged between the outer periphery of the lower bottom of the main scale tube and the lower mounting seat. In this way, the sealing ring can ensure a certain gap and elastic connection between the outer periphery of the lower bottom of the main scale tube and the lower mounting seat, playing a secondary role in preventing leakage and slightly adjusting the relative position of the main scale tube and the lower mounting seat, ensuring that the axis of the main scale tube is perpendicular, and achieving the purpose of reducing the system error.

[0010] Even further, a sealing ring is also provided in the upper mounting seat, and the sealing ring is also arranged between the outer periphery of the upper top of the main scale tube and the upper mounting seat. In this way, the sealing ring can ensure a certain gap and elastic connection between the outer periphery of the upper top of the main scale tube and the upper mounting seat, playing a secondary role in preventing leakage and slightly adjusting the relative position of the main scale tube and the upper mounting seat, ensuring that the axis of the main scale tube is perpendicular, and achieving the purpose of reducing the system error.

[0011] Further, a sealing ring is also provided on the inner periphery of the upper top of the main scale tube, and the sealing ring is arranged between the inner periphery of the upper top of the main scale tube and the liquid level tube. In this way, the sealing ring can fix the relative position between the main scale tube and the liquid level tube, playing a role in shock buffering and secondary leakage prevention, reducing the probability of damage to the liquid level tube caused by external force, and ensuring the safety of the device.

[0012] Furthermore, a sealing ring is also provided on the inner circumference of the lower bottom of the main scale cylinder, and the sealing ring is arranged between the inner circumference of the lower bottom of the main scale cylinder and the liquid level tube. In this way, the sealing ring can fix the relative position between the main scale cylinder and the liquid level tube, play a role in shock buffering and secondary anti-leakage, reduce the probability of the liquid level tube being damaged by external forces, and ensure the safety of the device.

[0013] As an optimal option, the main scale cylinder observation window is arranged on both sides of the main scale, and the vernier cylinder observation window is arranged on both sides of the vernier scale. In this way, it is convenient to observe the concave liquid level of the liquid to be measured in the liquid level tube through the main scale cylinder observation window and the vernier cylinder observation window, so as to realize the positioning and measurement of the object in the vernier cylinder structure.

[0014] As an optimal option, a refracting mirror is provided on the vernier cylinder, and the refracting mirror is arranged on one of the vernier cylinder observation windows. In this way, the aiming and positioning direction can be changed through the refracting mirror, so that the aiming and positioning direction is consistent with the reading direction, which is convenient for improving the measurement work efficiency.

[0015] As an optimal option, a fastening screw is provided on the vernier cylinder, a limiting strip is arranged between the main scale cylinder and the vernier cylinder, the limiting strip is arranged on the opposite side of the main scale, and the fastening screw is installed in cooperation with the limiting strip. In this way, by adjusting the fastening screw, a certain frictional force is generated among the main scale cylinder, the vernier cylinder and the limiting strip, so as to achieve the purpose of fixing the vernier cylinder.

[0016] In Embodiment 1, a fixing rivet is provided on the vernier cylinder observation window, the aiming and positioning mechanism is a metal wire, and the metal wire is arranged on the vernier cylinder observation window through the fixing rivet. In this way, the metal wire is arranged in the V-shaped groove of the vernier cylinder through the fixing rivet and appears in the observation window. By adjusting the position of the vernier cylinder, the metal wire is driven to be flush with the concave liquid level of the liquid to be measured in the liquid level tube, so as to achieve accurate positioning.

[0017] In Embodiment 2, a plane mirror is provided on the vernier cylinder, the plane mirror is arranged on the vernier cylinder observation window on the opposite side of the refracting mirror, and the aiming and positioning mechanism is a positioning line arranged on the plane mirror. In this way, by adjusting the position of the vernier cylinder, the positioning line on the plane mirror is driven to be flush with the concave liquid level of the liquid to be measured in the liquid level tube, so as to achieve accurate positioning.

[0018] The advantages of the present invention are as follows:

[0019] Its measurement principle is simple and the operation is convenient, without the need to retrain the operators; it reduces the distance between the axis of the liquid level tube and the measurement axis of the main scale, reduces the influence not conforming to the Abbe measurement principle, and significantly reduces the systematic error caused by the excessive distance between the axis of the liquid level tube and the axis of the main scale cylinder; its appearance structure is more concise, changing from the original parallel structure of the metering neck, liquid level tube, and measuring scale to the parallel structure of the metering neck and liquid level gauge, or the single structure where the liquid level gauge is the metering neck; the main scale cylinder plays a role in protecting the liquid level tube to a certain extent, reducing the probability of damage to the liquid level tube caused by being easily impacted by external forces; it solves the problems such as aging, cracking, and unqualified engraved line width of the heat-bent plexiglass ring in the existing measurement method, reducing the random error introduced thereby; its aiming and positioning mechanism has a higher levelness, improving the positioning accuracy and reducing the systematic error; by processing multiple annular V-grooves with a certain spacing or scribing multiple symmetrically distributed positioning lines, the range of the liquid level gauge can be expanded by 40 mm; its installation and maintenance are simple. When installing or disassembling the liquid level gauge, it can be easily achieved with only two specifications of hexagon wrenches; it can also be applied to the capacity measurement of other non-pressure-bearing metal containers. It systematically solves many design defects existing in the existing standard metal measuring vessels. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 is a schematic diagram of the internal structure of the present invention and its installation position with respect to the standard metal measuring vessel;

[0022] Figure 3 is a schematic diagram of the internal structure of the present invention from another perspective;

[0023] Figure 4 is a schematic diagram of the internal structure of the present invention in the axial direction;

[0024] Figure 5 is a schematic diagram of the structure of the vernier cylinder and the aiming and positioning mechanism in Embodiment 1;

[0025] Figure 6 is a schematic diagram of the structure of the vernier cylinder and the aiming and positioning mechanism in Embodiment 2;

[0026] Figure 7 is a schematic diagram of the structure of the vernier cylinder and the aiming and positioning mechanism in Embodiment 3.

[0027] In the figure: main scale barrel 1 (wherein: main scale graduation 1.1, main scale barrel observation window 1.2), vernier barrel 2 (wherein: vernier scale 2.1, vernier barrel observation window 2.2, fixed rivet 2.3), aiming and positioning mechanism 3, standard metal measuring device 4, liquid level tube 5, upper mounting seat 6, lower mounting seat 7 (wherein: oil-resistant gasket 7.1), sealing ring 8, refracting mirror 9, plane mirror 10, fastening screw 11, limit strip 12, hollow compression screw 13, positioning direction a, reading direction b. Detailed implementation mode

[0028] The following further describes the present invention in detail in conjunction with the accompanying drawings and specific embodiments:

[0029] As Figures 1 to 4, A liquid level gauge for accurately measuring the liquid level height in a liquid level tube, which is arranged on a standard metal measuring container 4. A liquid level tube 5 is provided on the standard metal measuring container 4, and the liquid level tube 5 contains the liquid to be measured. It includes a main scale cylinder 1, the liquid level tube 5 is sleeved in the main scale cylinder 1, a main scale 1.1 is provided axially on the main scale cylinder 1, and a vernier cylinder 2 is also sleeved outside the main scale cylinder 1. A vernier scale 2.1 is provided axially on the vernier cylinder 2, and the line ends of the main scale 1.1 and the vernier scale 2.1 are tangent; a main scale cylinder observation window 1.2 is provided on the main scale cylinder 1, and a vernier cylinder observation window 2.2 is provided on the vernier cylinder 2. In this way, the liquid surface of the liquid to be measured in the liquid level tube 5 can be observed through the vernier cylinder observation window 2.2 and the main scale cylinder observation window 1.2. A aiming and positioning mechanism 3 is also provided on the vernier cylinder 2, and the aiming and positioning mechanism 3 is arranged on the vernier cylinder observation window 2.2. An upper mounting seat 6 and a lower mounting seat 7 are provided on the standard metal measuring container 4. The upper mounting seat 6 is arranged at the top of the liquid level tube 5, and the lower mounting seat 7 is arranged at the bottom of the liquid level tube 5. The main scale cylinder 1 is fixed on the standard metal measuring container 4 through the upper mounting seat 6 and the lower mounting seat 7. An oil-resistant gasket 7.1 is provided in the lower mounting seat 7, and the oil-resistant gasket 7.1 is arranged between the lower bottom surface of the main scale cylinder 1 and the lower mounting seat 7. The oil-resistant gasket 7.1 is also arranged between the upper mounting seat 6 and the liquid level tube 5, and the oil-resistant gasket 7.1 is fixed between the upper mounting seat 6 and the lower mounting seat 7 through a hollow compression screw 13. A sealing ring 8 is also provided in the lower mounting seat 7, and the sealing ring 8 is arranged between the outer periphery of the lower bottom of the main scale cylinder 1 and the lower mounting seat 7. A sealing ring 8 is also provided in the upper mounting seat 6, and the sealing ring 8 is arranged between the outer periphery of the upper top of the main scale cylinder 1 and the upper mounting seat 6. A sealing ring 8 is also provided on the inner periphery of the upper top of the main scale cylinder 1, and the sealing ring 8 is also arranged between the inner periphery of the upper top of the main scale cylinder 1 and the liquid level tube 5. The main scale cylinder observation window 1.2 is arranged on both sides of the main scale 1.1, and the vernier cylinder observation window 2.2 is arranged on both sides of the vernier scale 2.1. A refracting mirror 9 is provided on the vernier cylinder 2, and the refracting mirror 9 is arranged on one of the vernier cylinder observation windows 2.2. A fastening screw 11 is provided on the vernier cylinder 2, a limiting strip 12 is provided on the main scale cylinder 1, and the limiting strip 12 is arranged on the opposite side of the main scale 1.1. The fastening screw 11 and the limiting strip 12 are in interference fit. A threaded hole is provided on the vernier cylinder 2. The fastening screw 11 selects different types according to functions and plays a positioning, fastening and adjusting role respectively. The fastening screw 11 can be a tip set screw, a flat-end high-head knurled screw or a flat-end set screw. A limiting groove is provided on the main scale cylinder 1, and the limiting groove is arranged on the opposite side of the main scale 1.1. The limiting strip 12 is installed in the limiting groove through a positioning strip mounting threaded hole, and the limiting strip 12 is in frictional contact with the limiting groove.

[0030] In one embodiment, a V-shaped groove is provided on the outer circumference of the cursor tube 2. Rivet holes are provided at both ends of the V-shaped groove. A V-shaped groove is accurately machined 20 mm above and below the V-shaped groove to increase the measuring range. The aiming and positioning mechanism 3 is a wire, which is tensioned and installed in the V-shaped groove through a fixing rivet 2.3. The installed wire appears on the observation windows of the two cursor tubes as two parallel wires. The plane formed by the two wires is perpendicular to the axis of the cursor tube. When the vertices of the two wires and the liquid level to be measured are in the same plane, it is accurate positioning.

[0031] In another embodiment, plane mirrors 10 are symmetrically arranged on the cursor tube 2. The plane mirrors 10 are arranged on the observation window 2.2 of the cursor tube on the opposite side of the refracting mirror 9. The aiming and positioning mechanism 3 is a positioning line provided on the plane mirror 10. Positioning lines are engraved in parallel 20 mm above and below the positioning line of the aiming and positioning mechanism 3 to increase the measuring range. The aiming mechanism 3 is an integral body composed of the plane mirror 10 and the positioning line. When the positioning line and the vertex of the liquid level to be measured are in the same plane, it is accurate positioning.

[0032] Embodiments of the present invention:

[0033] The core components of the present invention are a main scale tube 1, a cursor tube 2 coaxially installed with the liquid level tube 5, and an aiming and positioning mechanism 3.

[0034] The liquid level tube 5 is a transparent glass tube with both ends open. Its upper end communicates with the atmosphere, and its lower end communicates with the inside of the standard metal measuring device 4, in the form of a communicating vessel, serving to display the liquid level height in the standard metal measuring device 4.

[0035] The main scale tube 1 is longitudinally provided with a pair of symmetrically arranged long strip main scale tube observation windows 1.2, a scale plane provided with main scale graduations 1.1, and guide grooves longitudinally distributed for installing the limit strips 12; the main scale tube observation windows 1.2 are symmetrically distributed; the limit strips 12 are installed in the guide grooves. The limit strips 12 are copper strips, which cooperate with the cursor tube 2 through fastening screws 11 to play a role in limiting and maintaining friction. The cursor tube 2 can only slide longitudinally along the main scale tube 1 without relative rotation.

[0036] The axis of the main scale tube 1 coincides with the axis of the liquid level tube 5 to be measured. The main scale graduations 1.1 are engraved on the surface of the main scale tube. The engraving pitch of the main scale graduations 1.1 is 1 mm, which also has the function of a main scale; the main scale tube 1 is a stainless steel tube with an outer radius of 10 mm and a wall thickness of 3 mm. Its radius is the distance between the axis to be measured (liquid level tube 5) and the scale axis (main scale graduations 1.1), and this distance is much smaller than the distance between the axis to be measured and the scale axis in the existing measurement structure (generally greater than 25 mm), reducing the systematic error introduced by not conforming to the Abbe principle.

[0037] The aiming and positioning mechanism 3 is an additional mechanism added to the cursor tube 2 for accurately positioning the liquid level.

[0038] The liquid level tube 5, the main scale tube 1, the vernier tube 2 and the aiming and positioning mechanism 3 are combined into a metering assembly.

[0039] The upper mounting seat 6 and the lower mounting seat 7 are respectively welded on the standard metal measuring vessel 4. Before welding, the levels of the upper mounting seat 6 and the lower mounting seat 7 are adjusted using a level and a special mounting member to ensure that the metering assembly to be installed subsequently is perpendicular to the liquid level in the liquid level tube 5.

[0040] The sealing ring 8 is an O-shaped flexible sealing component, which is sleeved on the liquid level tube 5, leaving a certain gap between the main scale tube 1 and the liquid level tube 5 to prevent the measured liquid from overflowing through the gap between the two, playing a secondary sealing role and at the same time protecting the glass liquid level tube 5. Oil-resistant gaskets 7.1 are provided in both the upper mounting seat 6 and the lower mounting seat 7. The main scale tube 1 and the liquid level tube 5 are installed between the upper mounting seat 6 and the lower mounting seat 7 through hollow compression screws 13 at the upper part to ensure no liquid leakage.

[0041] Embodiment 1:

[0042] As Figure 5 shown, the vernier tube 2 is longitudinally provided with a pair of symmetrically arranged long strip-shaped vernier tube observation windows 2.2 and a graduated plane provided with vernier scales 2.1; the vernier tube observation windows 2.2 are symmetrically arranged and correspond to the main scale tube observation windows 1.2;

[0043] The graduated plane is engraved with vernier scales 2.1 with a pitch of 0.98 mm. The vernier scales 2.1 are tangent to the main scale 1.1 to complete the function of accurately indicating the height; the aiming and positioning mechanism 3 is installed on the outer circumference of the vernier tube 2 to achieve accurate positioning of the liquid level.

[0044] A V-shaped groove is machined on the outer circumference of the vernier tube 2. Using the characteristic that the plane of the V-shaped groove is perpendicular to the axis of rotation, a wire is tensioned and installed in the V-shaped groove and fixed in the rivet hole with a rivet 2.3. The wire is the positioning line 3, and the liquid level surrounded by the vernier tube 2 is aimed and positioned by the wire. The positioning direction a is perpendicular to the reading direction b. V-shaped grooves can be machined at 20 mm above and below the vernier tube 2 respectively to expand the measurement range.

[0045] Embodiment 2:

[0046] As Figure 6 shown, the vernier tube 2 is longitudinally provided with a pair of symmetrically arranged long strip-shaped vernier tube observation windows 2.2 and a graduated plane provided with vernier scales 2.1; the vernier tube observation windows 2.2 are symmetrically arranged and correspond to the main scale tube observation windows 1.2;

[0047] On the graduated line plane, vernier scales 2.1 with a pitch of 0.98 mm are engraved. The vernier scales 2.1 are tangent to the main scale graduations 1.1 to complete the function of accurately indicating the height. An aiming and positioning mechanism 3 is installed on the outer circumference of the vernier cylinder 2 to achieve accurate positioning of the liquid level.

[0048] On the observation window 2.2 of the vernier cylinder, plane mirrors 10 with positioning lines are symmetrically installed. During installation, ensure that the plane of the paired positioning lines 3 is perpendicular to the axis of the liquid level tube 5. Aim at the liquid level surrounded by the vernier cylinder 2 with the plane of the positioning lines 3. The aiming direction a is perpendicular to the reading direction b. A positioning line can be added 20 mm above and below the plane mirror 10 respectively to expand the measurement range.

[0049] Embodiment 3:

[0050] As Figure 7 shown, the vernier cylinder 2 is longitudinally provided with a pair of symmetrically arranged long strip-shaped vernier cylinder observation windows 2.2 and a graduated line plane with vernier scales 2.1. The vernier cylinder observation windows 2.2 are symmetrically arranged and correspond to the main scale cylinder observation windows 1.2.

[0051] On the graduated line plane, vernier scales 2.1 with a pitch of 0.98 mm are engraved. The vernier scales 2.1 are tangent to the main scale graduations 1.1 to complete the function of accurately indicating the height. An aiming and positioning mechanism 3 is installed on the outer circumference of the vernier cylinder 2 to achieve accurate positioning of the liquid level.

[0052] On the observation window 2.2 of the vernier cylinder 2, a refracting mirror 9 with positioning lines and a plane mirror 10 with positioning lines are symmetrically installed. Ensure that the plane of the paired positioning lines 3 is perpendicular to the axis of the liquid level tube 5. Aim at the liquid level surrounded by the vernier cylinder 2 with the plane of the positioning lines 3. The aiming direction a is parallel to the reading direction b, which is convenient for positioning and reading. A parallel positioning line is added 20 mm above and below the refracting mirror 9 and the plane mirror 10 respectively to expand the measurement range.

[0053] Usage method of the present invention:

[0054] During installation, first adjust the anchor bolts of the standard metal measuring device 4 to make the liquid bubble of the standard metal measuring device 4 at the center of the level bubble.

[0055] During use, the anchor bolts of the standard metal measuring device 4 should also be adjusted first to make the liquid bubble of the standard metal measuring device 4 at the center of the level bubble, ensuring that the standard metal measuring device 4 is in a usable state. At this time, the main scale cylinder 1 is in a vertical state.

[0056] When the liquid to be measured is injected into the standard metal measuring vessel 4, the measuring personnel should closely monitor the liquid level in the observation window 1.2 of the main scale cylinder. When the liquid to be measured just appears in the liquid level tube 5, reduce the injection flow rate of the liquid to be measured. When the liquid level height of the liquid to be measured reaches the ideal height, stop the injection; wait for the bubbles in the liquid to be measured in the standard metal measuring vessel 4 to disappear until the liquid level surface of the liquid to be measured is clear; move the vernier cylinder 2 up and down along the main scale cylinder 1, driving the aiming and positioning mechanism 3 to move synchronously. At the same time, keep the line of sight synchronized with the two positioning lines before and after the aiming and positioning mechanism 3. When the plane of the positioning line 3 is tangent to the top of the concave liquid surface of the liquid to be measured, tighten the fastening screw 11 on the vernier cylinder 2; read the value according to the reading method of the vernier. The read value is the liquid level height, and the reading is reserved to two significant figures, and the mantissa is a multiple of 0.02.

[0057] At this time, the volume of the liquid to be measured is obtained according to the following formula:

[0058] Volume of the liquid to be measured = Nominal capacity of the standard metal measuring vessel + (Relative height of the liquid level measured by the liquid level gauge - Height value corresponding to the nominal capacity of the standard metal measuring vessel) × Graduation capacity of the standard metal measuring vessel

[0059] The nominal capacity of the standard metal measuring vessel 4, the height value corresponding to the nominal capacity of the standard metal measuring vessel 4, and the graduation capacity of the standard metal measuring vessel 4 are all known values. Therefore, by measuring the relative height of the liquid level of the liquid to be measured, the volume of the liquid to be measured can be calculated according to the formula.

[0060] When reading, use the surface of the barrel wall of the main scale cylinder 1 as the main scale facet, and the equal division spacing of the main scale graduation 1.1 is 1 mm. Use the hollow barrel wall of the vernier cylinder 2 as the facet of the vernier scale 2.1, and the equal division spacing of the vernier scale 2.1 is 0.98 mm, with a total of 51 graduation lines, divided into 50 equal parts, and the total length is 49 mm.

[0061] When the "0" graduation line of the main scale graduation 1.1 is aligned with the "0" graduation line of the vernier scale 2.1, the read value is "0.00 mm" at this time; move the vernier cylinder 2 so that the second graduation line of the main scale graduation 1.1 is aligned with the second graduation line of the vernier scale 2.1, indicating that the vernier cylinder 2 has moved a distance of 1 × 0.02 mm. At this time, the read value is "0.02 mm"; and so on, align the 51st vernier graduation line with the 51st main scale graduation line, indicating that the vernier cylinder has moved a distance of 50 × 0.02 mm. At this time, the read value is "1.00 mm".

[0062] In actual work, temperature correction is also required. Since it has nothing to do with the present invention, it will not be described here.

[0063] When the present invention is actually used:

[0064] On the outer walls of the hollow main scale barrel 1 and the vernier barrel 2, a main scale barrel observation window 1.2 and a vernier barrel observation window 2.2 are machined. A glass liquid level tube 5 is sleeved inside, and the observation and aiming at the liquid level enclosed within the vernier barrel 2 are realized by means of the aiming and positioning mechanism 3.

[0065] It arranges the vernier measurement structure by utilizing the wall thickness of the hollow and thick-walled main scale barrel 1 and the vernier barrel 2, and respectively engraves the main scale 1.1 and the vernier scale 2.1, reducing the distance between the measured axis and the main scale axis, and reducing the systematic error introduced by not conforming to the Abbe measurement principle.

[0066] The aiming and positioning mechanism 3 selects a metal wire with a uniform wire diameter, or a refracting mirror 9 and a plane mirror 10 with a uniform positioning line width, and controls the engraved line width to meet the requirement in Article 6.2.4 of the national verification regulation JJG259-2005 "Standard Metal Measuring Vessels" that the positioning scribed line width is not greater than 0.25 mm, reducing the random error introduced by the excessive width of the organic glass scribed line during the positioning process.

[0067] It utilizes the characteristic that the V-shaped groove machined coaxially is perpendicular to the rotation axis of the vernier barrel 2 to ensure that the plane of the metal wire is parallel to the liquid plane, reducing the systematic error introduced by the non-parallelism between the organic glass scribed line and the liquid surface in the original measurement structure.

[0068] It utilizes the fact that the refracting mirror 9 can change the propagation direction of light to make the target positioning direction a parallel to the reading direction b within the vernier barrel 2. The measurer can complete the positioning and reading without changing the working position, which can effectively improve the work efficiency.

[0069] It machines multiple V-shaped grooves or multiple pairs of positioning lines, which can expand the measurement range of the liquid level gauge.

[0070] Finally, it should be pointed out that the above embodiments are only relatively representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and there can be many variations. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A liquid level gauge for accurately measuring the liquid level height in a liquid level tube, which is arranged on a standard metal measuring vessel (4), and a liquid level tube (5) is provided on the standard metal measuring vessel (4), and the liquid level tube (5) contains the liquid to be measured. It is characterized in that: It includes a main scale cylinder (1) sleeved outside a liquid level tube (5). The main scale cylinder (1) is axially provided with a main scale (1.1). A vernier cylinder (2) is also sleeved outside the main scale cylinder (1). The vernier cylinder (2) is axially provided with a vernier scale (2.1). The line ends of the main scale (1.1) and the vernier scale (2.1) are tangent to each other. A main scale cylinder observation window (1.2) is provided on the main scale cylinder (1), and a vernier cylinder observation window (2.2) is provided on the vernier cylinder (2). The main scale cylinder observation window (1.2) is arranged on both sides of the main scale (1.1), and the vernier cylinder observation window (2.2) is arranged on both sides of the vernier scale (2.1). In this way, the liquid level of the liquid to be measured in the liquid level tube (5) is observed through the vernier cylinder observation window (2.2) and the main scale cylinder observation window (1.2). A refracting mirror (9) and a plane mirror (10) are provided on the vernier cylinder (2). The refracting mirror (9) is arranged on one of the vernier cylinder observation windows (2.2), and the plane mirror (10) is arranged on the vernier cylinder observation window (2.2) on the opposite side of the refracting mirror (9). A aiming and positioning mechanism (3) is further provided on the vernier cylinder (2). The aiming and positioning mechanism (3) is installed on the vernier cylinder observation window (2.2), and the aiming and positioning mechanism (3) is a positioning line arranged on the plane mirror (10).

2. The liquid level gauge for accurately measuring the liquid level height in the liquid level tube according to claim 1, characterized in that: An upper mounting seat (6) and a lower mounting seat (7) are provided on the standard metal measuring device (4). The upper mounting seat (6) is arranged at the top of the liquid level tube (5), and the lower mounting seat (7) is arranged at the bottom of the liquid level tube (5). The main scale cylinder (1) is fixed on the standard metal measuring device (4) through the upper mounting seat (6) and the lower mounting seat (7).

3. The liquid level gauge for accurately measuring the liquid level height in the liquid level tube according to claim 2, wherein: An oil-resistant gasket (7.1) is arranged in the lower mounting seat (7), and the oil-resistant gasket (7.1) is arranged between the lower bottom surface of the main scale cylinder (1) and the lower mounting seat (7).

4. The liquid level gauge for accurately measuring the liquid level height in the liquid level tube according to claim 3, wherein: A sealing ring (8) is also arranged in the lower mounting seat (7), and the sealing ring (8) is arranged between the outer periphery of the lower bottom of the main scale cylinder (1) and the lower mounting seat (7).

5. The liquid level gauge for accurately measuring the liquid level height in the liquid level tube according to any one of claims 2 to 4, characterized in that: A sealing ring (8) is also arranged in the upper mounting seat (6), and the sealing ring (8) is further arranged between the outer periphery of the upper top of the main scale cylinder (1) and the upper mounting seat (6). A sealing ring (8) is also arranged on the inner periphery of the upper top of the main scale cylinder (1), and the sealing ring (8) is further arranged between the inner periphery of the upper top of the main scale cylinder (1) and the liquid level tube (5).

6. The liquid level gauge for accurately measuring the liquid level height in the liquid level tube according to claim 1, wherein: A fixing rivet (2.3) is provided on the vernier cylinder observation window (2.2). The aiming and positioning mechanism (3) is a metal wire, and the metal wire is arranged on the vernier cylinder observation window (2.2) through the fixing rivet (2.3).

7. The liquid level gauge for accurately measuring the liquid level height in the liquid level tube according to claim 1, characterized in that: A fastening screw (11) is provided on the vernier cylinder (2), and a limiting strip (12) is provided on the main scale cylinder (1). The limiting strip (12) is arranged on the opposite side of the main scale (1.1), and the fastening screw (11) is in interference fit with the limiting strip (12).

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