Horn-mouth floating ball for floating ball liquid level meter of wet equipment

Abstract

The utility model discloses a flared floating ball for a floating ball liquid level meter of wet equipment, which belongs to the technical field of liquid level measurement and comprises a central rod, one end of the central rod is fixedly connected with a junction box, the other end of the central rod is provided with a positioning ring, and the middle of the central rod is sleeved with a lantern ring capable of axially sliding; a floating ball assembly is integrally formed on the radial inner side of the lantern ring, the floating ball assembly comprises an upper floating ball part and a lower floating ball part which are coaxially arranged, and through guide through holes are formed in the centers of the upper floating ball part and the lower floating ball part; the two ends of the guide through hole are provided with horn mouth structures, the hole diameter of each horn mouth structure is gradually expanded in the direction away from the center of the floating ball to form a conical surface, the surface roughness Ra of each conical surface is smaller than or equal to 0.8 micron, and each conical surface is provided with a nano ceramic coating; the stability and the anti-interference capability of the floating ball in liquid level measurement and the smoothness of matching with the central rod are improved, so that the accuracy and the reliability of measurement of the floating ball liquid level meter are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to liquid level measurement technical field, concretely relates to a loudspeaker mouth floating ball for wet process equipment floating ball liquid level meter, especially applicable to the liquid level measurement scene of existence liquid fluctuation, impurity adhesion and high flow rate working condition, aims at improving floating ball stability, anti -interference ability and service life. BACKGROUND

[0002] At present, in the wet process equipment, its floating ball liquid level meter is widely used in the measurement of liquid level. But the floating ball of the existing floating ball liquid level meter has some problems in the actual use. For example, when the liquid fluctuation is large, the ordinary floating ball is easy to produce the jamming and the like, which leads to the inaccurate liquid level measurement or the failure to work normally. Moreover, in some liquid environment containing impurities or having a certain flow rate, the floating ball surface is easy to be attached by impurities or affected by liquid scouring, thereby affecting the buoyancy and normal work of the floating ball, reducing the reliability and service life of the liquid level meter. At the same time, the cooperation between the floating ball and the center rod has the problems of large friction resistance and easy wear and the like.

[0003] Therefore, in view of the above defects, the utility model provides an improved loudspeaker mouth floating ball structure. CONTENT

[0004] 1. Technical problem to be solved:

[0005] In view of the problems existing in the prior art, the utility model aims to provide a loudspeaker mouth floating ball for wet process equipment floating ball liquid level meter, so as to improve the stability, anti-interference ability and smoothness of the cooperation with the center rod of the floating ball in the liquid level measurement, thereby improving the accuracy and reliability of the floating ball liquid level meter measurement.

[0006] 2. Technical scheme:

[0007] In order to solve the above problems, the utility model adopts the following technical scheme.

[0008] A loudspeaker mouth floating ball for wet process equipment floating ball liquid level meter, comprising a center rod, one end of the center rod is fixedly connected with a terminal box, the other end is provided with a positioning ring, the middle part of the center rod is sleeved with a sleeve ring which can axially slide;

[0009] The radial inner side of the sleeve ring is integrally formed with a floating ball assembly, the floating ball assembly comprises an upper floating ball part and a lower floating ball part arranged coaxially, the center of the upper floating ball part and the lower floating ball part is provided with a through guide through hole;

[0010] The two ends of the guide through hole are provided with a loudspeaker mouth structure, the hole diameter of the loudspeaker mouth structure gradually expands to form a conical surface along the direction away from the center of the floating ball, the surface roughness Ra of the conical surface is ≤0.8 μm and is provided with a nano ceramic coating;

[0011] Four Nd-Fe-B permanent magnets are evenly distributed in the circumference of the floating ball part, and the central angle interval of adjacent permanent magnets is 90°, and the floating ball assembly is made of polyether ether ketone composite material with a density less than the measured medium.

[0012] Further improvement is that the inner wall of the guide through hole is compounded with a polytetrafluoroethylene wear-resistant layer, the thickness of the wear-resistant layer is 1-2 mm, the cooperation gap between the wear-resistant layer and the center rod is 0.5-1 mm, and the surface friction coefficient of the wear-resistant layer is less than 0.1.

[0013] Further improvement is that the conical angle α of the horn mouth structure is 20°±0.5°, and the thickness of the nano ceramic coating of the conical surface is 50-100 μm, and the coating hardness is ≥HV800.

[0014] Further improvement is that the wear-resistant layer is combined with the inner wall of the guide through hole through a molding process, and the material of the wear-resistant layer is polytetrafluoroethylene or perfluoroalkoxy resin.

[0015] Further improvement is that the wall thickness tolerance of the hollow cavity of the floating ball assembly is ±0.1 mm, the outer surface roughness Ra is ≤0.4 μm, and the anti-attachment corrugated structure is arranged on the outer surface, the peak distance of the corrugated structure is 2-3 mm, and the wave height is 0.2-0.5 mm.

[0016] 3. Beneficial effects:

[0017] Compared with the prior art, the technical scheme has the following beneficial effects:

[0018] (1) Impact resistance is improved: the horn mouth structure disperses 30%-50% of the liquid impact force, and the floating ball deviates by ≤3 mm under high flow rate (2 m / s);

[0019] (2) Anti-pollution ability is enhanced: the nano ceramic coating and the corrugated surface reduce the impurity adhesion rate by 60%-70%;

[0020] (3) Low friction and long service life: the wear-resistant layer is designed in cooperation with a precise gap, the wear rate is reduced by 75%, and the service life is ≥5 years;

[0021] (4) Precise measurement: the uniform distribution of the permanent magnets ensures stable liquid level signal transmission, and the deviation is only 20% of the traditional floating ball.

[0022] It should be noted that the structures not introduced in the utility model are the same as or can be realized by the prior art, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is a three-dimensional structure schematic diagram of the utility model as a whole;

[0024] Fig. 2 Figure is a structure diagram of the floating ball assembly of the utility model;

[0025] Fig. 3 Figure is a structure diagram of the whole section of the utility model.

[0026] Figure label explanation:

[0027] 1, center pole; 2, junction box; 3, positioning ring; 4, collar; 5, floating ball assembly; 5a, upper floating ball part; 5b, lower floating ball part; 51, trumpet mouth structure; 52, permanent magnet; 53, wear-resistant layer. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings, the drawings show several embodiments of the utility model, however, the utility model can be realized in many different forms, and is not limited to the embodiments described herein, on the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0029] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0030] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing", "provided with", "provided in" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. Embodiment

[0032] As Figs. 1-3 shown, a kind of horn mouth floating ball for wet equipment floating ball liquid level meter, the horn mouth floating ball includes following core structure:

[0033] 1, center pole 1: one end fixed terminal box 2, for signal transmission;The other end is set positioning ring 3, limit floating ball stroke;Middle part is sleeved with the sleeve ring 4 that can axial sliding.

[0034] 2, floating ball assembly 5: sleeve ring 4 is integrally formed with coaxial upper floating ball part 5a and lower floating ball part 5b on the inside, the center of both is equipped with the guide through hole.

[0035] 3, horn mouth structure 51: the guide through hole is designed as the conical surface of hole diameter gradually expanding (conical angle α=20 °±0.5 °) at both ends, surface roughness Ra≤0.8 μm, and is coated with 50~100 μm thick nanometer ceramic coating (hardness ≥HV800), to disperse liquid impact and reduce resistance;

[0036] Nanometer ceramic coating hardness HV800 (referring to GB / T 4340.1-2009 test standard).

[0037] 4, Nd-Fe-B permanent magnet 52: four permanent magnets are evenly distributed in the inner periphery of upper floating ball part, the center angle interval of adjacent magnet is 90 °, to ensure that liquid level signal is evenly transmitted.

[0038] 5, wear layer 53: the inner wall of guide through hole is compounded 1~2mm thick polytetrafluoroethylene or perfluoroalkoxy resin layer, with the clearance of 0.5~1mm between center pole 1, friction coefficient <0.1.

[0039] 6, material and process: floating ball assembly 5 is made of polyether ether ketone (PEEK) composite material with density lower than the medium to be measured, the wall thickness tolerance of hollow cavity is ±0.1mm, the outer surface is provided with anti-attachment wave structure (peak distance 2~3mm, wave height 0.2~0.5mm), to further suppress impurity deposition;

[0040] The density of polyether ether ketone composite material is 1.3g / cm³ (referring to GB / T 1033-1986 test standard).

[0041] Specific operation steps include as follows:

[0042] Step 1: floating ball assembly 5 manufacturing

[0043] (1) material preparation: select polyether ether ketone (PEEK) composite material, pre-process as hollow cylindrical blank, density ≤1.3g / cm³;

[0044] (2) Injection molding: Precise mold injection molding of the upper floating ball part 5a and the lower floating ball part 5b to ensure the wall thickness tolerance of the hollow cavity ±0.1mm;

[0045] (3) Surface treatment: The outer surface is processed with a corrugated structure (peak-to-peak distance 2.5mm, wave height 0.3mm), and the roughness Ra≤0.4μm;

[0046] (4) The guide through hole is processed with a horn mouth with a conical angle of 20° at both ends, and is sprayed with a nano ceramic coating (thickness 80μm);

[0047] Step 2: Assembly of magnet and wear-resistant layer

[0048] (1) Permanent magnet embedding: Nd-Fe-B permanent magnets (N52 grade) are evenly distributed in the floating ball part, with a spacing of 90° between adjacent magnets, and are fixed with epoxy resin;

[0049] (2) Wear-resistant layer molding: Polytetrafluoroethylene powder is pre-filled into the guide through hole, and a 1.5mm thick wear-resistant layer 53 is formed by high temperature molding, with a gap of 0.8mm from the center rod 1;

[0050] Step 3: Assembly and debugging

[0051] (1) Ring assembly: The upper and lower floating ball parts are integrally formed with the ring 4 to ensure coaxiality ≤0.05mm;

[0052] (2) Center rod installation: The center rod 1 is inserted, and the terminal block 2 and the positioning ring 3 are fixed at both ends;

[0053] Step 4: Equipment installation and initial calibration

[0054] (1) Installation positioning: The floating ball liquid level meter is installed vertically in the measured container to ensure that the center rod 1 is perpendicular to the liquid surface with a deviation of ≤1°, avoiding uneven friction between the guide through hole and the center rod due to the inclination of the floating ball assembly 5;

[0055] (2) Terminal block configuration: Connect the terminal block 2 to the signal processing unit, and perform zero point calibration after power on. The initial position of the floating ball is confirmed by the magnetic induction signal;

[0056] (3) Dynamic debugging: Inject the measured liquid to 50% of the full range, manually shake the liquid level meter to simulate liquid fluctuation, and observe whether the floating ball deviation is ≤3mm. If it exceeds the tolerance, check the assembly precision of the horn mouth structure 51 and the wear-resistant layer 53.

[0057] (4) Performance test: Test in a liquid containing impurities with a flow rate of 2m / s, the floating ball deviation is 2.8mm, and the impurity adhesion amount is reduced by 65%;

[0058] After 5000 hours of continuous operation, the wear of the wear-resistant layer is less than 0.1mm, and the signal error is stable at ±0.8%.

[0059] The above-described embodiments only express certain implementation manners of the present application, and the description is relatively specific and detailed, but should not be understood as a limitation on the patent scope of the present application; it should be pointed out that, for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application; therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A bell mouthed float for a wet leg float level gauge comprising a central stem (1) characterised in that: One end of the center rod (1) is fixedly connected with a junction box (2), and the other end is provided with a positioning ring (3), the middle part of the center rod (1) is sleeved with a sleeve ring (4) which can axially slide; The radial inner side of the sleeve ring (4) is integrally formed with a floating ball assembly (5), the floating ball assembly (5) includes coaxially arranged upper floating ball part (5a) and lower floating ball part (5b), the center of the upper floating ball part (5a) and the lower floating ball part (5b) is provided with a through guide hole; Both ends of the guide hole are provided with a flared structure (51), the hole diameter of the flared structure (51) gradually expands to form a conical surface along the direction away from the center of the floating ball, the surface roughness Ra of the conical surface is ≤0.8μm and is provided with a nano ceramic coating; The upper floating ball part (5a) is uniformly distributed with four neodymium iron boron permanent magnets (52) in the circumferential direction, the central angle interval of adjacent permanent magnets is 90°, the floating ball assembly (5) is made of polyether ether ketone composite material with a density less than the measured medium.

2. A bell mouthed float for a wet leg float level gauge according to claim 1 characterised in that: The inner wall of the guide hole is compounded with a polytetrafluoroethylene wear-resistant layer (53), the thickness of the wear-resistant layer (53) is 1-2mm, the cooperation gap between the wear-resistant layer (53) and the center rod (1) is 0.5-1mm, the surface friction coefficient of the wear-resistant layer (53) is less than 0.

1.

3. A bell mouthed float for a wet leg float level gauge according to claim 1 characterised in that: The conical angle α of the flared structure (51) is 20°±0.5°, the thickness of the nano ceramic coating of the conical surface is 50-100μm, and the coating hardness is ≥HV800.

4. A bell mouthed float for a wet leg float level gauge according to claim 2, characterised in that: The wear-resistant layer (53) is combined with the inner wall of the guide hole through a molding process, and the material thereof is polytetrafluoroethylene or perfluoroalkoxy resin.

5. A bell mouthed float for a wet leg float level gauge according to claim 1 characterised in that: The wall thickness tolerance of the hollow cavity of the floating ball assembly (5) is ±0.1mm, the outer surface roughness Ra is ≤0.4μm and is provided with an anti-adhesion corrugated structure, the peak distance of the corrugated structure is 2-3mm, and the wave height is 0.2-0.5mm.

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