Three-rotor flow meter convenient to maintain

Abstract

The utility model provides a three-rotor flow meter convenient to maintain. The three-rotor flow meter convenient to maintain comprises a shell, two partition cavity end plates, two end covers, two air pressure balance assemblies, two access covers and two sealing pressing assemblies. The air pressure balance assembly comprises a balance core pipe and a breathable liquid-blocking film, the balance core pipe is inserted into the through hole, an internal flow channel, a first air hole and a second air hole are formed in the balance core pipe, and the breathable liquid-blocking film is detachably installed on the balance core pipe. When the access cover is installed in place, the sealing pressing assembly enables the balance core pipe to be assembled in the through hole in a sealed mode so as to prevent media in the first cavity from entering the second cavity through the through hole. Through the cooperation of the balance core pipe, the first air hole, the second air hole, the internal flow channel and the breathable liquid blocking film, the air pressure of the first cavity and the second cavity can be balanced, and the metering precision is ensured. When the breathable liquid blocking film needs to be replaced or overhauled, the end cover does not need to be disassembled, the air pressure balance assembly in the second cavity can be contacted only by disassembling the overhaul cover, and the overhaul steps are simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to flow measurement equipment technical field, concretely relates to a three rotor flowmeter convenient to maintain. BACKGROUND

[0002] Three rotor flowmeter as a kind of high-precision flow measurement equipment, is widely used in petroleum, chemical industry, metallurgy and other industrial fields, and it realizes accurate measurement to medium flow by the cooperative rotation of multiple rotors in shell.In the long-term use of three rotor flowmeter, to ensure measurement accuracy and equipment stability, internal key components need to be overhauled regularly.

[0003] The sealing and air pressure balance structure of existing three rotor flowmeter is designed in an integrated manner, when the air pressure balance component, such as air-permeable liquid-blocking membrane, needs to be replaced or overhauled, the shell of the entire flowmeter often needs to be disassembled, not only the disassembly steps are complicated, time-consuming and laborious, but also the core components such as shell, rotor and meter head may be damaged during disassembly, affecting the stability and safety of subsequent use of equipment.

[0004] To solve the above problems, a three rotor flowmeter convenient to maintain is proposed, which can complete the overhaul and maintenance of internal components without disassembling the entire equipment, simplify the maintenance process, improve the maintenance efficiency, and ensure the stability and safety of equipment operation. UTILITY MODEL CONTENTS

[0005] In view of the defects in the prior art, the utility model aims to provide a three rotor flowmeter convenient to maintain to solve or at least alleviate one or more of the above technical problems or other aspects in the prior art.

[0006] To achieve the above purpose, the utility model provides a three rotor flowmeter convenient to maintain, which comprises a shell, two openings are respectively arranged at two ends, two cavity end plates are respectively fixed at two openings, and the cavity end plates and the inner wall of the shell form a first cavity, the cavity end plates are penetrated by through holes, and the through holes are communicated with the first cavity, two end covers are arranged outside the cavity end plates on the corresponding side, and the end covers and the cavity end plates form a second cavity, two second cavities are respectively arranged on the two sides of the first cavity, and the end covers are provided with maintenance holes communicated with the corresponding second cavities.

[0007] Two air pressure balancing assemblies correspond to the two chamber end plates respectively, the air pressure balancing assembly comprises a balancing core pipe and a gas-permeable liquid-blocking film, the balancing core pipe is inserted into the through hole, an internal flow channel is arranged in the balancing core pipe, a first air hole is arranged at one end of the balancing core pipe close to the first chamber, a second air hole is arranged on the wall of the balancing core pipe, the internal flow channel is in communication with the first air hole and the second air hole respectively, and the gas-permeable liquid-blocking film is detachably arranged on the end face of the balancing core pipe and covers the first air hole; two maintenance covers are detachably arranged in the corresponding maintenance holes respectively; and two sealing and pressing assemblies correspond to the balancing core pipes respectively, when the maintenance cover is installed in place, the sealing and pressing assembly is used for applying pressure to the balancing core pipe towards the first chamber, so that the balancing core pipe is sealingly assembled in the through hole, so as to prevent the medium in the first chamber from entering the second chamber through the through hole.

[0008] Preferably, the sealing and pressing assembly comprises a spring, a stop block, a sealing assembly and a pressing column; the stop block is arranged on the side of the balancing core pipe away from the first air hole, the stop block is configured to be movable only in the axial direction of the balancing core pipe, the spring is connected to the stop block and the balancing core pipe respectively, the spring is used for applying elastic force to the stop block, so that the stop block has a tendency to move away from the first chamber; the sealing assembly is used for fixing the gas-permeable liquid-blocking film and keeping the balancing core pipe and the through hole sealed; and the pressing column is fixed to the inner side of the maintenance cover, when the maintenance cover is installed in place, the pressing column abuts against the stop block, so that the spring is compressed, thereby pressing the balancing core pipe on the chamber end plate.

[0009] Preferably, the side of the chamber end plate away from the first chamber is recessed to form a first mounting groove coaxial with the through hole; the sealing assembly comprises a first sealing ring, a first sealing sleeve and a second sealing sleeve, the first sealing ring is mounted in the first mounting groove, the first sealing sleeve covers the end face of the balancing core pipe close to the first air hole, and the first sealing sleeve is provided with a third air hole coaxial with the first air hole; the second sealing sleeve is sleeved outside the first sealing sleeve and the balancing core pipe, the second sealing sleeve abuts against the first sealing ring, and the second sealing sleeve is provided with a fourth air hole coaxial with the first air hole; and the gas-permeable liquid-blocking film is clamped between the first sealing sleeve and the second sealing sleeve.

[0010] Preferably, the balance core pipe is internally provided with a containing cavity, an end face of the balance core pipe away from the first gas hole is provided with a clearance hole in communication with the containing cavity, a hole diameter of the clearance hole is smaller than an inner diameter of the containing cavity; the spring and the stopper are both arranged in the containing cavity, an outer diameter of the stopper is larger than the hole diameter of the clearance hole, the compression column can pass through the clearance hole and abut against the stopper; one end of the spring abuts against a cavity wall of the containing cavity, and the other end of the spring abuts against the stopper.

[0011] Preferably, the cavity end plate away from the first cavity is provided with a plurality of support rods, the support rods are parallel to the axis of the balance core pipe, and the outer wall of the balance core pipe is provided with a plurality of first lugs, each of the first lugs corresponds to one of the support rods, and the first lug is provided with a first mounting hole through which the support rod passes.

[0012] Preferably, the outer wall of the end cover is provided with a plurality of limiting seats, and a limiting opening is formed between the limiting seat and the outer wall of the end cover; the maintenance cover is radially extended to form a plurality of limiting protrusions, the number of the limiting protrusions corresponds to the number of the limiting seats, and the limiting protrusion can be clamped into the limiting opening.

[0013] Preferably, the end cover away from the second cavity is recessed to form a second mounting groove coaxial with the maintenance hole, and a second sealing ring is arranged in the second mounting groove; the inner side of the maintenance cover is provided with a boss, the boss abuts against the second mounting groove, and the compression column is arranged on the boss.

[0014] Preferably, the maintenance cover is radially extended to form a plurality of second lugs, the second lugs are provided with second mounting holes, the end cover away from the second cavity is provided with a plurality of screw holes, and when the limiting protrusion is completely clamped into the limiting opening, the second mounting hole is aligned with the corresponding screw hole.

[0015] The utility model discloses beneficial effects:

[0016] The utility model discloses a three rotor flowmeter convenient to maintain, which balances the air pressure of the first cavity and the second cavity through the cooperation of the balance core pipe, the first gas hole, the second gas hole, the internal flow channel and the air-permeable liquid-blocking membrane, avoids the unstable operation of the equipment caused by the change of the medium pressure in the first cavity, and ensures the measurement accuracy. When the sealing compression assembly is installed in place, the balance core pipe is subjected to the pressure towards the first cavity, so that the balance core pipe is tightly and sealingly assembled in the through hole, thereby effectively preventing the medium in the first cavity from entering the second cavity through the through hole, improving the sealing performance, and ensuring the sealing performance and safety of the equipment operation.

[0017] Meanwhile, by setting inspection holes and detachable inspection covers on the end caps, when it is necessary to replace or repair the gas-permeable liquid-resistant membrane, it is not necessary to disassemble the end caps. Only the inspection cover needs to be removed to access the air pressure balance component located in the second chamber, which greatly simplifies the maintenance steps, shortens the maintenance time, and reduces the workload of maintenance personnel. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 A schematic diagram of a three-rotor flowmeter for easy maintenance provided in an embodiment of this utility model;

[0020] Figure 2 This is a schematic cross-sectional view of the three rotor flowmeter;

[0021] Figure 3 This is a partial schematic diagram of the inspection hole.

[0022] Figure 4 This is a schematic diagram of the balanced core tube structure;

[0023] Figure 5 A schematic diagram of a structure in which a first sealing sleeve and a second sealing sleeve are installed for the balancing core tube;

[0024] Figure 6 for Figure 5 A cross-sectional view under the condition;

[0025] Figure 7 This is a schematic diagram of the structure of the cavity end plate;

[0026] Figure 8 This is a partial schematic diagram of the through hole;

[0027] Figure 9 This is a structural diagram of the inspection cover;

[0028] Figure 10 for Figure 2 A partial schematic diagram of point A in the middle;

[0029] Figure label:

[0030] 10, housing; 11, first cavity; 20, partition cavity end plate; 21, through hole; 22, first mounting groove; 23, support rod; 30, end cover; 31, second cavity; 32, access hole; 33, limiting seat; 34, limiting port; 35, second mounting groove; 36, screw hole; 40, balance core tube; 41, internal flow channel; 42, first air hole; 43, second air hole; 44, containing cavity; 45, clearance hole; 46, first lug; 461, first mounting hole; 50, breathable liquid-blocking membrane; 60, access cover; 61, limiting protrusion; 62, boss; 63, second lug; 631, second mounting hole; 71, spring; 72, stop block; 73, compression column; 74, first sealing ring; 75, first sealing sleeve; 751, third air hole; 76, second sealing sleeve; 761, fourth air hole. DETAILED DESCRIPTION

[0031] The embodiments of the technical scheme of the utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, and therefore only serve as examples, and cannot limit the protection scope of the utility model.

[0032] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meaning understood by the technical personnel in the field to which the utility model belongs.

[0033] In the description of the present application, it should be 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", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0034] In addition, the terms "first", "second", and the like are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] like Figures 1-10 As shown, in one embodiment of this utility model, a three-rotor flowmeter that is easy to maintain is provided, including a housing 10, two partition end plates 20, two end caps 30, two air pressure balancing components, two inspection covers 60, and two sealing and pressing components. The housing 10 has openings at both ends. The three-rotor flowmeter is installed vertically, therefore, the inlet of the housing 10 faces upwards and the outlet faces downwards. The two partition end plates 20 are fixed to the two openings respectively, and the two partition end plates 20 and the inner wall of the housing 10 enclose a first cavity 11. A through hole 21 is passed through the partition end plates 20, and the through hole 21 communicates with the first cavity 11. Each end cap 30 is installed over the cavity end plate 20 on the corresponding side and together with the cavity end plate 20 forms a second cavity 31. The two second cavities 31 are located on both sides of the first cavity 11. The second cavity 31 is connected to the first cavity 11 through the through hole 21. The end cap 30 is provided with an inspection hole 32 that is connected to the corresponding second cavity 31. The inspection hole 32 is coaxially arranged with the through hole 21.

[0038] Two air pressure balancing assemblies correspond to two cavity end plates 20 respectively, and each air pressure balancing assembly comprises a balancing core pipe 40 and a gas-permeable liquid-blocking film 50, and the balancing core pipe 40 is inserted into the through hole 21. The balancing core pipe 40 is internally provided with an internal flow channel 41, and a first air hole 42 is formed at one end of the balancing core pipe 40 close to the first cavity 11, and a second air hole 43 is formed in the wall of the balancing core pipe 40, and the internal flow channel 41 is in communication with the first air hole 42 and the second air hole 43 respectively. The gas-permeable liquid-blocking film 50 can be an oil-repellent modified expanded polytetrafluoroethylene (ePTFE) microporous film, and the gas-permeable liquid-blocking film 50 is detachably installed on the end face of the balancing core pipe 40 and covers the first air hole 42. Two maintenance covers 60 are detachably installed in the corresponding maintenance holes 32 respectively, and each sealing and pressing assembly corresponds to one balancing core pipe 40, and when the maintenance cover 60 is installed in place, the sealing and pressing assembly is used to apply pressure to the balancing core pipe 40 towards the first cavity 11, so that the balancing core pipe 40 is tightly sealed and assembled in the through hole 21, so as to prevent the medium in the first cavity 11 from entering the second cavity 31 through the through hole 21.

[0039] The three-rotor flowmeter disclosed in the embodiment is convenient to maintain, and through cooperation of the balancing core pipe 40, the first air hole 42, the second air hole 43, the internal flow channel 41 and the gas-permeable liquid-blocking film 50, the air pressure of the first cavity 11 and the second cavity 31 can be balanced, the unstable operation of the equipment caused by the change of the medium pressure in the first cavity 11 is avoided, and the measurement accuracy is ensured. When the maintenance cover 60 is installed in place, the sealing and pressing assembly will apply pressure to the balancing core pipe 40 towards the first cavity 11, so that the balancing core pipe 40 is tightly sealed and assembled in the through hole 21, thereby effectively preventing the medium in the first cavity 11 from entering the second cavity 31 through the through hole 21, improving the sealing performance and ensuring the sealing performance and safety of the equipment operation.

[0040] Meanwhile, by arranging the maintenance hole 32 and the detachable maintenance cover 60 on the end cover 30, when the gas-permeable liquid-blocking film 50 needs to be replaced or maintained, the end cover 30 does not need to be disassembled, and only the maintenance cover 60 needs to be disassembled to access the air pressure balancing assembly in the second cavity 31, thereby greatly simplifying the maintenance steps, shortening the maintenance time and reducing the working intensity of the operation and maintenance personnel.

[0041] In one embodiment, referring to Figures 4-6The sealing and pressing assembly comprises a spring 71, a stopper 72, a sealing assembly and a pressing column 73. The stopper 72 is arranged on the side of the balance core tube 40 away from the first air hole 42, and is configured to move only in the axial direction of the balance core tube 40. The spring 71 is connected to the stopper 72 and the balance core tube 40 respectively, and is configured to apply an elastic force to the stopper 72, so that the stopper 72 has a tendency to move away from the first cavity 11. The sealing assembly is configured to fix the gas-permeable and liquid-blocking membrane 50 and to seal the balance core tube 40 and the through hole 21. The pressing column 73 is fixed to the inner side of the maintenance cover 60, and when the maintenance cover 60 is installed in place, the pressing column 73 abuts against the stopper 72, so that the spring 71 is compressed, thereby pressing the balance core tube 40 against the partition cavity end plate 20.

[0042] When the maintenance cover 60 is installed in place, the pressing column 73 abuts against the stopper 72 and compresses the spring 71. The elastic force of the spring 71 is transmitted to the balance core tube 40 through the stopper 72, so that the balance core tube 40 is continuously pressed, and the balance core tube 40 is tightly attached to the partition cavity end plate 20. Even after long-term use, the spring 71 can automatically compensate, so that the sealing performance between the balance core tube 40 and the partition cavity end plate 20 is always stable, and the sealing failure caused by wear is avoided.

[0043] The sealing assembly is configured to fix the gas-permeable and liquid-blocking membrane 50 and to seal the balance core tube 40 and the through hole 21. The installation stability of the gas-permeable and liquid-blocking membrane 50 is ensured, and the sealing and pressing of the balance core tube 40 are ensured, so that the components can be replaced and maintained individually.

[0044] When the maintenance cover 60 is removed, the pressure of the pressing column 73 on the stopper 72 disappears, the spring 71 returns to its original state and pushes the stopper 72 to move away from the first cavity 11. In this way, the balance core tube 40 and the gas-permeable and liquid-blocking membrane 50 can be quickly removed by the maintenance personnel for maintenance or replacement, thereby further improving the convenience of maintenance.

[0045] In one embodiment, the side of the partition cavity end plate 20 away from the first cavity 11 is recessed to form a first installation groove 22 coaxial with the through hole 21. The sealing assembly comprises a first sealing ring 74, a first sealing sleeve 75 and a second sealing sleeve 76. The first sealing ring 74 is installed in the first installation groove 22. The first sealing sleeve 75 covers the end face of the balance core tube 40 close to the first air hole 42. The first sealing sleeve 75 is provided with a third air hole 751 coaxial with the first air hole 42. The second sealing sleeve 76 is sleeved on the first sealing sleeve 75 and the balance core tube 40. The second sealing sleeve 76 abuts against the first sealing ring 74. The second sealing sleeve 76 is provided with a fourth air hole 761 coaxial with the first air hole 42. The gas-permeable and liquid-blocking membrane 50 is clamped between the first sealing sleeve 75 and the second sealing sleeve 76.

[0046] Through the combined design of the first sealing ring 74, the first sealing sleeve 75 and the second sealing sleeve 76, the first sealing sleeve 75 cooperates with the second sealing sleeve 76 to achieve reliable clamping and fixing of the gas permeable and liquid blocking membrane 50, and the first sealing ring 74 cooperates with the second sealing sleeve 76 to achieve sealing between the compartment end plate 20 and the end face of the balance core pipe 40, the multiple sealing structure improves the sealing reliability, effectively prevents leakage of the medium from the gap between the balance core pipe 40 and the through hole 21, or the installation position of the gas permeable and liquid blocking membrane 50.

[0047] The gas permeable and liquid blocking membrane 50 is clamped between the first sealing sleeve 75 and the second sealing sleeve 76, and only two sealing sleeves need to be separated to take out the gas permeable and liquid blocking membrane 50 during disassembly, so that the replacement operation is simple and convenient, and the maintenance efficiency is improved. The third gas hole 751 and the fourth gas hole 761 are coaxial with the first gas hole 42, which ensures that the gas flow can smoothly pass through the gas permeable and liquid blocking membrane 50 and the internal flow channel 41, and realizes the pressure balance between the first cavity 11 and the second cavity 31, avoiding the influence of the gas flow on the pressure balance effect due to poor gas flow.

[0048] In one embodiment, the balance core pipe 40 is provided with a containing cavity 44, and the end face of the balance core pipe 40 away from the first gas hole 42 is provided with a relief hole 45 in communication with the containing cavity 44, and the diameter of the relief hole 45 is smaller than the inner diameter of the containing cavity 44. The spring 71 and the stop block 72 are arranged in the containing cavity 44, and the outer diameter of the stop block 72 is greater than the diameter of the relief hole 45, and the compression column 73 can pass through the relief hole 45 and abut against the stop block 72. One end of the spring 71 abuts against the cavity wall of the containing cavity 44, and the other end of the spring 71 abuts against the stop block 72. Integrating the spring 71 and the stop block 72 in the containing cavity 44 fully utilizes the internal space of the balance core pipe 40, avoids the structural redundancy caused by externally arranging the spring 71 and the stop block 72, makes the overall structure more compact, and reduces the occupied space.

[0049] In one embodiment, referring to Figure 7 and Figure 8 , the compartment end plate 20 away from the first cavity 11 is provided with three support rods 23, the axis of the support rod 23 is parallel to the axis of the balance core pipe 40, and the outer wall of the balance core pipe 40 is provided with three first ears 46, each first ear 46 corresponds to one support rod 23, and the first ear 46 is provided with a first mounting hole 461 for the support rod 23 to pass through. The cooperation of the support rod 23 and the first ear 46 plays a guiding role in the installation and movement of the balance core pipe 40, and ensures that the balance core pipe 40 always moves in the axial direction. At the same time, since the three-rotor flow meter is installed vertically, the cooperation of the support rod 23 and the first ear 46 can support the balance core pipe 40 as a whole, avoiding the balance core pipe 40 from being separated from the through hole 21 before the maintenance cover 60 is installed.

[0050] In one embodiment, referring to Figure 1 , Figure 3and Figure 9 The outer wall of the end cover 30 is provided with two limiting seats 33, and a limiting opening 34 is formed between the limiting seat 33 and the outer wall of the end cover 30. The inspection cover 60 is radially extended and formed with two limiting protrusions 61, the number of the limiting protrusions 61 corresponds to the number of the limiting seats 33, and the limiting protrusions 61 can be clamped into the limiting opening 34. After the limiting protrusions 61 are clamped into the limiting opening 34, the inspection cover 60 can be pre-fixed, so as to prevent displacement of the inspection cover 60 in the subsequent fixing process, and the inspection cover 60 is pushed open under the elastic force of the spring 71, thereby facilitating subsequent reinforcing and fixing operation of the maintenance personnel, and the assembly convenience is improved.

[0051] In one embodiment, a second installation groove 35 coaxial with the inspection hole 32 is formed on the side of the end cover 30 away from the second cavity 31, and a second sealing ring (not shown in the drawings) is installed in the second installation groove 35. The inner side of the inspection cover 60 is provided with a boss 62 abutting against the second installation groove 35, and the pressing column 73 is arranged on the boss 62. The second sealing ring is installed in the second installation groove 35 and tightly abuts against the boss 62 of the inspection cover 60, so as to realize reliable sealing between the inspection cover 60 and the end cover 30, prevent impurities such as dust and water vapor from entering the second cavity 31, avoid pollution of the air pressure balancing assembly or affect the sealing performance, and also prevent gas in the second cavity 31 from leaking.

[0052] In one embodiment, the inspection cover 60 is radially extended and formed with a plurality of second lugs 63, the second lug 63 is provided with a second installation hole 631, and the side of the end cover 30 away from the second cavity 31 is provided with a plurality of screw holes 36. When the limiting protrusion 61 is completely clamped into the limiting opening 34, the second installation hole 631 is aligned with the corresponding screw hole 36. Through cooperation of the second installation hole 631 and the screw hole 36, the inspection cover 60 is reinforced and fixed by bolts, the fixing effect is reliable, the inspection cover 60 can be effectively prevented from loosening due to factors such as vibration and air pressure change during equipment operation, and the continuous and stable sealing and pressing function is ensured.

[0053] In the specification of the utility model, a large number of specific details are explained. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail, so as not to obscure the understanding of the specification.

[0054] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A three rotor flowmeter that facilitates maintenance, characterized by, The utility model relates to a kind of gas pressure balance assemblies, including: Shell (10), two ends are respectively provided with opening; Two bulkhead end plates (20), are respectively fixed in two described openings, two described bulkhead end plates (20) and the wall of the shell (10) are enclosed to form first cavity (11), the through hole (21) is communicated with the first cavity (11) in the bulkhead end plate (20); Two end covers (30), each described end cover (30) is covered in the bulkhead end plate (20) outside corresponding side, and with the bulkhead end plate (20) is enclosed to form second cavity (31), two described second cavities (31) are located at the two sides of the first cavity (11), and the end cover (30) is provided with access hole (32) communicated with corresponding second cavity (31); Two gas pressure balance components correspond to two bulkhead end plates (20) respectively, the gas pressure balance component includes balance core pipe (40) and gas-permeable liquid-blocking membrane (50), the balance core pipe (40) is inserted in the through hole (21), the balance core pipe (40) is provided with internal flow channel (41) inside, the balance core pipe (40) is provided with first air hole (42) in the end close to the first cavity (11), the tube wall of the balance core pipe (40) is provided with second air hole (43), the internal flow channel (41) is communicated with the first air hole (42) and the second air hole (43) respectively, the gas-permeable liquid-blocking membrane (50) is detachably installed on the end face of the balance core pipe (40) and covers the first air hole (42); Two access covers (60) are detachably installed in corresponding access holes (32) respectively;And Two sealing and pressing components, each described sealing and pressing component corresponds to a described balance core pipe (40), when the access cover (60) is installed in place, the sealing and pressing component is used to apply pressure to the balance core pipe (40) towards the first cavity (11), so that the balance core pipe (40) is sealed and assembled in the through hole (21), to prevent the medium in the first cavity (11) from entering the second cavity (31) through the through hole (21).

2. The three rotor flow meter of claim 1, wherein, The sealing and pressing component includes spring (71), stop block (72), sealing component and pressing column (73); The stop block (72) is arranged on the side of the balance core pipe (40) away from the first air hole (42), the stop block (72) is configured to move only in the axial direction of the balance core pipe (40), the spring (71) is connected to the stop block (72) and the balance core pipe (40) respectively, the spring (71) is used to apply elastic force to the stop block (72), so that the stop block (72) has a tendency to move away from the first cavity (11) side. The sealing assembly is used for fixing the gas permeable liquid blocking membrane (50) and sealing the balance core pipe (40) and the through hole (21); the pressing column (73) is fixed to the inner side of the maintenance cover (60), and when the maintenance cover (60) is installed in place, the pressing column (73) abuts against the stopper (72), the spring (71) is compressed, and the balance core pipe (40) is pressed against the compartment end plate (20).

3. The three rotor flow meter of claim 2, wherein, The side, away from the first cavity (11), of the compartment end plate (20) is recessed to form a first mounting groove (22) coaxial with the through hole (21); the sealing assembly comprises a first sealing ring (74), a first sealing sleeve (75) and a second sealing sleeve (76), the first sealing ring (74) is mounted in the first mounting groove (22), the first sealing sleeve (75) covers the end face of the balance core pipe (40) close to the first gas hole (42), and the first sealing sleeve (75) is provided with a third gas hole (751) coaxial with the first gas hole (42). The second sealing sleeve (76) is sleeved outside the first sealing sleeve (75) and the balance core pipe (40), the second sealing sleeve (76) abuts against the first sealing ring (74), the second sealing sleeve (76) is provided with a fourth gas hole (761) coaxial with the first gas hole (42); and the gas permeable liquid blocking membrane (50) is clamped between the first sealing sleeve (75) and the second sealing sleeve (76).

4. The three rotor flow meter of claim 2, wherein, The balance core pipe (40) is provided with a containing cavity (44), and the end face, away from the first gas hole (42), of the balance core pipe (40) is provided with a clearance hole (45) in communication with the containing cavity (44), and the hole diameter of the clearance hole (45) is smaller than the inner diameter of the containing cavity (44). The spring (71) and the stopper (72) are arranged in the containing cavity (44), the outer diameter of the stopper (72) is greater than the hole diameter of the clearance hole (45), the pressing column (73) can abut against the stopper (72) after passing through the clearance hole (45), one end of the spring (71) abuts against the cavity wall of the containing cavity (44), and the other end of the spring (71) abuts against the stopper (72).

5. The three rotor flow meter of claim 1, wherein, The side, away from the first cavity (11), of the compartment end plate (20) is provided with a plurality of support rods (23), the axis of the support rod (23) is parallel to the axis of the balance core pipe (40), the outer wall of the balance core pipe (40) is provided with a plurality of first lugs (46), each first lug (46) corresponds to one support rod (23), and the first lug (46) is provided with a first mounting hole (461) through which the support rod (23) passes.

6. The three rotor flow meter of any of claims 2-4, wherein, The outer wall of the end cover (30) is provided with a plurality of limiting seats (33), and a limiting opening (34) is formed between the limiting seat (33) and the outer wall of the end cover (30); the inspection cover (60) is radially extended to form a plurality of limiting protrusions (61), the number of the limiting protrusions (61) corresponds to the number of the limiting seats (33), and the limiting protrusions (61) can be clamped into the limiting opening (34).

7. The three rotor flow meter of claim 6, wherein, The side of the end cover (30) away from the second cavity (31) is recessed to form a second mounting groove (35) coaxial with the inspection hole (32), and a second sealing ring is mounted in the second mounting groove (35); the inner side of the inspection cover (60) is provided with a boss (62), the boss (62) abuts against the second mounting groove (35), and the pressing column (73) is arranged on the boss (62).

8. The three rotor flow meter of claim 6, wherein, The inspection cover (60) is radially extended to form a plurality of second lugs (63), the second lug (63) is provided with a second mounting hole (631), the side of the end cover (30) away from the second cavity (31) is provided with a plurality of screw holes (36), and when the limiting protrusion (61) is completely clamped into the limiting opening (34), the second mounting hole (631) is aligned with the corresponding screw hole (36).

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