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CN-224216125-U - Positive displacement flowmeter resistant to strong acid and strong alkali

CN224216125UCN 224216125 UCN224216125 UCN 224216125UCN-224216125-U

Abstract

The utility model discloses a positive displacement flowmeter resistant to strong acid and strong alkali, which comprises a flowmeter body, wherein a metering groove for accommodating a pair of meshed metering gears is formed in the flowmeter body, an upper cover is arranged at the upper end of the flowmeter body, the inner surface of the upper cover and the metering groove jointly define a closed metering cavity, a bottom plate is arranged on the bottom surface of the flowmeter body, and a top cover is arranged on the upper cover. The utility model improves the use condition that the positive displacement flowmeter at the present stage is not suitable for strong acid and alkali media such as hydrochloric acid, hydrofluoric acid, sodium hydroxide and the like, and adopts the integrally formed metering cavity body and the upper cover, so that the positive displacement flowmeter resistant to strong acid and alkali can realize the 3MPa pressure resistance.

Inventors

  • WEN HUA
  • MIAO YIJIE

Assignees

  • 华鹍仪器仪表制造(上海)有限公司

Dates

Publication Date
20260508
Application Date
20250630

Claims (5)

  1. 1. The utility model provides a positive displacement flowmeter of resistant strong acid and alkali, includes flowmeter body (1), its characterized in that, offer in flowmeter body (1) and be used for holding a pair of meshing metering gear's metering groove (6), upper cover (8) are installed to flowmeter body (1) upper end, the internal surface of upper cover (8) with metering groove (6) prescribe a limit jointly and form confined measurement cavity, bottom plate (10) are installed to the bottom surface of flowmeter body (1), top cap (9) are installed to upper cover (8).
  2. 2. The positive displacement flowmeter of claim 1, wherein the outer wall of the flowmeter body (1) is provided with two groups of connecting pipes (7), two ends of the two groups of connecting pipes (7) are respectively an inlet end (3) and an outlet end (4), the inlet end (3) and the outlet end (4) are in flange structure, and the flowmeter body (1) is integrally formed with the connecting pipes (7) on two sides and the flange structure.
  3. 3. The positive displacement flowmeter of claim 2, wherein the flowmeter body (1) and the threaded hole (2) are made of PTFE (polytetrafluoroethylene), the flowmeter body (1) is provided with a sealing ring groove (5) along the outer edge of the metering groove (6), and the flowmeter body (1) and the upper cover (8) are sealed by sealing rings arranged on the sealing ring groove (5).
  4. 4. The positive displacement flowmeter of claim 3, wherein the flowmeter body (1) and the upper cover (8) are provided with through holes (11) and sliding holes (13) along the outer circumference of the sealing ring groove (5), the outer walls of the top cover (9) and the bottom plate (10) are provided with threaded holes (2) in a circumferential manner, the threaded holes (2) correspond to the through holes (11) and the sliding holes (13) in number and position one by one, the threaded holes (2) at the bottom plate (10) are internally threaded with screws (12), the screws (12) are movable in the through holes (11) and the sliding holes (13) and extend into the threaded holes (2) at the top cover (9), and the bottom plate (10) is combined with the flowmeter body (1), the upper cover (8) and the top cover (9) into a whole through the screws (12).
  5. 5. The positive displacement flowmeter of claim 4, wherein the top cover (9) and the bottom plate (10) are made of metal materials, and the top cover (9) is provided with a limit groove along the edge of the outer contour of the upper cover (8).

Description

Positive displacement flowmeter resistant to strong acid and strong alkali Technical Field The utility model relates to the technical field of flowmeters, in particular to a positive displacement flowmeter resistant to strong acid and strong alkali. Background In the related industries of chemical industry, pharmacy, sewage treatment and the like, some strong acid and alkali mediums are used, and when encountering strong acid and alkali mediums, the conventional field is to adopt a metering device of PTFE (polytetrafluoroethylene). Because PTFE is inert to almost all chemical media (including strong acid, strong alkali, organic solvent and the like), strong corrosive fluids such as concentrated sulfuric acid, hydrochloric acid, hydrofluoric acid and the like can be safely measured, and the corrosion failure problem of the traditional metal materials is avoided. However, PTFE has low mechanical strength (about 20-30MPa tensile strength), is easy to generate plastic deformation or cold flow phenomenon under high pressure or high load, causes gear clearance change, influences measurement accuracy, and has poor wear resistance, so that the surface of a gear is easy to wear under high speed or high load conditions, and the service life is shortened. Therefore, the positive displacement flowmeter made of PTFE material needs to be periodically inspected, and needs to be periodically replaced after the flowmeter is used for a long time, so that the problem of leakage of the liquid receiving surface caused by abrasion of the PTFE material is avoided. Disclosure of utility model Technical proposal In order to achieve the purpose, the flowmeter comprises a flowmeter body, wherein a metering groove for accommodating a pair of meshed metering gears is formed in the flowmeter body, an upper cover is arranged at the upper end of the flowmeter body, the inner surface of the upper cover and the metering groove jointly define a closed metering cavity, a bottom plate is arranged on the bottom surface of the flowmeter body, and a top cover is arranged on the upper cover. Preferably, two groups of connecting pipes are arranged on the outer wall of the flowmeter body, the two groups of connecting pipes are respectively provided with an inlet end and an outlet end, the inlet end and the outlet end are arranged in a flange structure, and the flowmeter body and the connecting pipes and the flange structures on the two sides are integrally formed. Preferably, the flowmeter body and the threaded hole are made of PTFE polytetrafluoroethylene, a sealing ring groove is formed in the flowmeter body along the outer edge of the metering groove, and the flowmeter body and the upper cover are sealed through a sealing ring arranged on the sealing ring groove. Preferably, the through hole and the sliding hole are formed in the outer periphery of the sealing ring groove along the outer periphery of the sealing ring groove, threaded holes are formed in the periphery of the top cover and the outer wall of the bottom plate, the threaded holes correspond to the through holes and the sliding holes in number and in position one by one, the threaded holes in the bottom plate are connected with screws in the threaded holes in a threaded mode, the screws move in the through holes and the sliding holes, the screws extend into the threaded holes in the top cover, and the bottom plate is combined with the flow meter body, the upper cover and the top cover into a whole through the screws. Preferably, the top cover and the bottom plate are both made of metal materials, and the top cover is provided with a limit groove along the edge of the outer contour of the upper cover. Advantageous effects Compared with the prior art, the utility model provides a positive displacement flowmeter resistant to strong acid and strong alkali, which has the following beneficial effects: 1. The flowmeter body adopts integrated into one piece's flange joint mode, reduces when vibrating too big because the pipeline, probably leads to the inside mechanism of flowmeter not hard up or damage, influences the problem of measuring result's accuracy. 2. On the basis of the PTFE gear flowmeter, the design of the top plate and the bottom plate of the metal material is adopted, the flowmeter body and the upper cover are locked through the top plate and the bottom plate of the bolt and the metal material, so that the tension crack caused by the fact that the bolt is directly connected with the flowmeter body in the long-time use process is avoided, the pressure resistance of the integrated positive-displacement flowmeter is enhanced, and the positive-acid and strong-alkali resistant positive-displacement flowmeter is ensured to be capable of resisting pressure exceeding 3MPa. Drawings FIG. 1 is a schematic structural diagram of a positive displacement flowmeter resistant to strong acid and strong alkali according to the present utility model; FIG. 2 is a schematic diagram of the structure o