Roots flowmeter rear cover structure and roots flowmeter

Abstract

The utility model relates to the technical field of flowmeter equipment, in particular to a rear cover structure of a roots flowmeter and the roots flowmeter. The end face of the bearing sleeve sinks in the shaft hole to form a concave structure, the axial depth of the concave structure enables a non-contact anti-abrasion gap to be formed between the end face of the bearing sleeve and the inner side face of the rear cover, a certain axial distance exists between the waist wheel and the bearing sleeve under the action of high-speed rotation and medium pressure, and direct contact is avoided. Frictional wear between the waist wheel and the bearing sleeve is avoided as far as possible, the long-term use metering precision and the service life of the waist wheel flowmeter are improved, the frequency of frequent replacement and maintenance due to damage of parts is reduced, and the maintenance cost and the downtime are reduced. Meanwhile, the end face of the bearing sleeve does not need to be flush with the inner side face of the rear cover, the requirements for the axial size of the bearing sleeve and the machining precision of a shaft hole are lowered, and the manufacturing difficulty and cost caused by high-precision machining are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to flowmeter equipment technical field especially relates to waist wheel flowmeter back cover structure and waist wheel flowmeter. BACKGROUND

[0002] Waist wheel flowmeter as a kind of high-precision volumetric flow measuring device, waist wheel flowmeter accounts for a large proportion of market share in natural gas measurement;Waist wheel in waist wheel flowmeter directly affects the measurement accuracy and service life;Waist wheel in waist wheel flowmeter and bearing sleeve generally adopt stainless steel material to meet the corrosion resistance demand, waist wheel flowmeter back cover includes the inner side surface located inside and the outer side surface located outside;In prior art, the rear cover of waist wheel flowmeter is provided with shaft hole, the bearing sleeve installed in shaft hole is usually designed as the end face of its towards inner side surface flush with the inner side surface of rear cover, however, the structure has significant defects:

[0003] 1, when the end face of bearing sleeve flushes with the inner side surface of rear cover, waist wheel will contact with bearing sleeve, under the action of high-speed rotation and medium pressure, the contact area of waist wheel and bearing sleeve is prone to wear due to long-term friction, the wear caused by friction can cause the measurement accuracy to decline, even cause leakage risk, affect the service life of waist wheel;2, to realize the complete flush of the end face of bearing sleeve and the inner side surface of rear cover, the bearing sleeve axial dimension and shaft hole machining precision are required to be high, and high-precision machining significantly increases manufacturing cost;3,

[0004] Based on this, the applicant considers designing a waist wheel flowmeter back cover structure and waist wheel flowmeter capable of improving service life and processing fault tolerance. INVENTION CONTENTS

[0005] In view of the above technical problems of prior art, the technical problem to be solved by the utility model is: how to provide a waist wheel flowmeter back cover structure and waist wheel flowmeter capable of improving service life and processing fault tolerance.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0007] Waist wheel flowmeter back cover structure, including back cover and waist wheel, the bearing is sleeved on the waist wheel rotating shaft, the back cover includes oppositely arranged inner side surface and outer side surface, the shaft hole is set on the inner side surface, the bearing sleeve for accommodating the bearing is arranged in the shaft hole, the end face of bearing sleeve towards inner side surface is sunken in the shaft hole, and the recess structure maintaining axial spacing with the inner side surface of back cover is formed.

[0008] The working principle and advantages of the technical scheme of waist wheel flowmeter back cover structure and waist wheel flowmeter are:

[0009] The end surface of the bearing sleeve is sunken in the shaft hole to form a recess structure, the axial depth of the recess structure forms a non-contact wear-preventing gap between the end surface of the bearing sleeve and the inner side surface of the rear cover, so that there is a certain axial spacing between the waist wheel and the bearing sleeve under the action of high-speed rotation and medium pressure, direct contact is avoided, friction and wear between the waist wheel and the bearing sleeve are avoided as much as possible, the measurement accuracy and service life of the waist wheel flowmeter during long-term use are improved, the frequency of frequent replacement and maintenance due to component damage is reduced, and the maintenance cost and downtime are reduced; meanwhile, since the end surface of the bearing sleeve does not need to be flush with the inner side surface of the rear cover, the requirements for the axial size of the bearing sleeve and the machining precision of the shaft hole are reduced, and the manufacturing difficulty and cost caused by high-precision machining are reduced.

[0010] Further, the axial depth of the recess structure is 0.5mm-2mm.

[0011] Further, a through hole is formed in the outer side surface of the rear cover and communicates with the shaft hole, and a transparent piece is sealingly connected in the through hole.

[0012] Further, the transparent piece is detachably connected in the through hole.

[0013] Further, the transparent piece comprises a nut fixedly connected to a threaded stud, the threaded stud is threadedly connected to the through hole, the threaded stud and the nut are axially provided with a through hole, and a transparent part is arranged in the through hole to block the through hole.

[0014] Further, the transparent part is a transparent block embedded in the through hole.

[0015] Further, a ring groove is formed in the side of the nut facing the threaded stud, and a sealing ring is arranged in the ring groove.

[0016] Further, the rear cover is provided with at least two shaft holes.

[0017] Further, the rear cover is provided with at least one through hole.

[0018] The waist wheel flowmeter comprises the rear cover structure of the waist wheel flowmeter. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a three-dimensional structure schematic view of the waist wheel flowmeter of the embodiment of the utility model;

[0020] Figure 2 It is a three-dimensional structure schematic view of the rear cover of the embodiment of the utility model;

[0021] Figure 3 It is a three-dimensional structure schematic view of the waist wheel and the bearing of the embodiment of the utility model;

[0022] Figure 4A sectional structure schematic view of the waist wheel flowmeter according to an embodiment of the present application;

[0023] Figure 5 For Figure 4 An enlarged schematic view at A in the middle;

[0024] Figure 6 A three-dimensional structure schematic view of the transparent piece according to an embodiment of the present application;

[0025] Figure 7 A three-dimensional structure schematic view of the sealing ring according to an embodiment of the present application;

[0026] Figure 8 A three-dimensional structure schematic view of the transparent block according to an embodiment of the present application;

[0027] In the above drawings: 100, waist wheel flowmeter;

[0028] 200, rear cover; 210, inner side surface; 220, outer side surface; 230, shaft hole; 240, through hole; 250, recessed structure;

[0029] 300, waist wheel; 310, rotating shaft; 320, bearing; 330, bearing sleeve;

[0030] 410, stud; 420, nut; 412, through hole; 421, transparent block; 422, sealing ring. DETAILED DESCRIPTION

[0031] In the description of the present application, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0032] Referring to Figures 1-5 , the present embodiment provides a waist wheel flowmeter 100 rear cover 200 structure, including rear cover 200 and waist wheel 300, the rotating shaft 310 of waist wheel 300 is sleeved with bearing 320, rear cover 200 includes oppositely arranged inner side surface 210 and outer side surface 220, shaft hole 230 is formed on inner side surface 210, bearing sleeve 330 for accommodating bearing 320 is arranged in shaft hole 230, the end surface of bearing sleeve 330 towards inner side surface 210 is sunken in shaft hole 230, forming the recessed structure 250 with the axial spacing of the inner side surface 210 of rear cover 200.

[0033] In this embodiment, the end surface of the bearing sleeve 330 is sunken in the shaft hole 230 to form a recess structure 250, and the axial depth of the recess structure 250 forms a non-contact wear-preventing gap between the end surface of the bearing sleeve 330 and the inner side surface 210 of the rear cover 200, so that there is a certain axial spacing between the waist wheel 300 and the bearing sleeve 330 under the action of high-speed rotation and medium pressure, avoiding direct contact; as much as possible to avoid friction and wear between the waist wheel 300 and the bearing sleeve 330, which helps to improve the measurement accuracy and service life of the waist wheel flowmeter 100 during long-term use, reduces the frequency of frequent replacement and maintenance due to component damage, reduces maintenance costs and downtime; at the same time, since the end surface of the bearing sleeve 330 does not need to be flush with the inner side surface 210 of the rear cover 200, the requirements for the axial size of the bearing sleeve 330 and the machining precision of the shaft hole 230 are reduced, and the manufacturing difficulty and cost caused by high-precision machining are reduced.

[0034] Preferably, the axial depth of the recess structure 250 is 0.5mm-2mm; there is an axial spacing of 0.5mm-2mm between the end surface of the bearing sleeve 330 and the inner side surface 210 of the rear cover 200, without the need for extremely high requirements for the axial size of the bearing sleeve 330 and the machining precision of the shaft hole 230, making production and processing easier and reducing the processing difficulty and manufacturing cost.

[0035] Preferably, as shown in Figure 1 , Figure 2 , Figure 4 and Figure 5 , a through hole 240 is formed in the outer side surface 220 of the rear cover 200 and communicates with the shaft hole 230, and a transparent piece is sealingly connected in the through hole 240; the through hole 240 is formed in the outer side surface 220 of the rear cover 200 and communicates with the shaft hole 230, and the transparent piece is sealingly connected in the through hole 240, and the visibility of the transparent piece allows the operator to directly observe the operation of the bearing 320 and the rotating shaft 310 of the waist wheel 300, such as whether there is abnormal vibration, whether it is rotating normally, etc., so as to find problems in time, maintenance and repair, and improve the reliability and stability of the equipment; at the same time, the sealing connection of the transparent piece ensures the sealing of the through hole 240 and prevents medium leakage, ensuring the accuracy of the flowmeter measurement; the transparent piece also allows the operator to more conveniently perform daily inspection and maintenance, find potential problems in time, reduce equipment downtime, and improve production efficiency; in particular, the transparent piece is coaxially arranged with the shaft hole 230.

[0036] Preferably, as shown in Figure 1 , Figure 2 , Figure 4 and Figure 5As shown in the figure, the transparent piece is detachably connected in the through hole 240; since the transparent piece is detachably connected in the through hole 240, when it is necessary to check, maintain or replace the bearing 320 and the rotating shaft 310 of the waist wheel 300, the transparent piece can be conveniently detached to more comprehensively observe and operate the internal structure; at the same time, this connection mode also facilitates cleaning or replacement of the transparent piece, ensuring its transparency and sealing.

[0037] Preferably, as shown in the figure, Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 , the transparent piece includes a nut 420 fixedly connected to a stud 410, the stud 410 is threadedly connected with the through hole 240, and the stud 410 and the nut 420 are axially provided with a through hole 412, and the through hole 412 is provided with a transparent part for sealing the through hole 412; the self-locking and sealing properties of the thread are used to realize the fixation and sealing of the transparent piece, and at the same time, the transparent part is located in the through hole 412, so that the internal condition can be directly observed; the threaded connection facilitates the installation and disassembly of the transparent piece, and maintenance personnel can easily unscrew the nut 420 and the stud 410 to remove the transparent piece for cleaning, replacement or checking of the internal structure, thereby improving the maintenance efficiency.

[0038] Preferably, as shown in the figure, Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 8 , the transparent part is a transparent block 421 embedded in the through hole 412; the transparent part is a transparent block 421 embedded in the through hole 412, and the tight connection of the transparent block 421 with the stud 410 and the nut 420 is realized by embedding the transparent block 421 in the through hole 412; the embedded transparent block 421 tightly cooperates with the through hole 412, and under the assistance of the threaded connection, the sealing property of the transparent piece is further enhanced, effectively preventing medium leakage and ensuring the measurement accuracy and operation safety of the flowmeter; specifically, the transparent piece can be made of transparent acrylic or glass.

[0039] Preferably, as shown in the figure, Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the side of the nut 420 facing the stud 410 is provided with an annular groove, and a sealing ring 422 is arranged in the annular groove; when the nut 420 is tightened with the stud 410, the sealing ring 422 is compressed between the annular groove and the outer side surface 220 to form a seal, preventing medium leakage from the threaded connection and ensuring the measurement accuracy and operation safety of the flowmeter.

[0040] Preferably, as shown in the figure, Figure 2 ,Figure 4 and Figure 5 As shown, the rear cover 200 has at least two shaft holes 230; the rotary flow meter 100 generally includes at least two rotary wheels 300, and the two shaft holes 230 are designed to cooperate with the two rotary wheels 300.

[0041] Preferably, such as Figure 2 , Figure 4 and Figure 5 As shown, the rear cover 200 has at least one through hole 240 to observe the operation of the rotary flow meter 100. Of course, multiple through holes 240 can also be provided to correspond one-to-one with multiple shaft holes 230 to observe the components in each through hole 240.

[0042] Specifically, the aforementioned transparent component can also be extended to other functions. For example, existing equipment can be used in conjunction with the transparent component to measure the speed of the rotating shaft 310 of the rotary wheel 300 inside the rotary wheel flow meter 100 from the outside, thereby calculating the medium flow velocity. During speed measurement, a photoelectric pulse acquisition device, as used in the prior art, can be used. A light-shielding plate, magnetic element, or other structure is preset on the side of the rotating shaft 310 facing the transparent component to periodically trigger the photoelectric sensor, generating a pulse signal proportional to the flow rate. The use of photoelectric pulse acquisition has the following advantages: by optimizing the photoelectric conversion circuit and signal processing algorithm, the temperature can be effectively reduced. Environmental interference such as pressure reduces measurement repeatability; digital pulse signals (such as square waves) are less affected by electromagnetic interference during transmission, and combined with shielding structure and dynamic threshold judgment technology, data reliability is guaranteed; it can be adapted to automation system integration and supports multiple protocol outputs: it supports interfaces such as 4-20mA analog signals and RS485 communication (MODBUS protocol), facilitating seamless integration with control systems such as PLCs and DCSs; at the same time, it avoids the friction loss of traditional mechanical contact detection, which can significantly extend the service life of the rotary flowmeter 100; it has high accuracy, reaching 0.1%~0.5%;

[0043] The rotary flow meter 100 includes the aforementioned rotary flow meter 100 rear cover 200 structure. The rotary flow meter 100 adopts the aforementioned rear cover 200 structure. Through the recessed design of the bearing sleeve 330 in the shaft hole 230 on the inner side 210 of the rear cover 200, the installation of the transparent part, and the threaded connection and sealing ring 422, it brings advantages such as improved measurement accuracy, extended service life, convenient maintenance and observation, and reduced manufacturing cost.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. The rear cover structure of the waist wheel flowmeter, comprising a rear cover and a waist wheel, a bearing is sleeved on the rotation shaft of the waist wheel, the rear cover comprises an inner side and an outer side arranged oppositely, an axle hole is formed on the inner side, and a bearing sleeve for accommodating the bearing is arranged in the axle hole, characterized in that, The end face of the bearing sleeve towards the inner side surface is sunken in the shaft hole, forming a recess structure maintaining axial distance with the inner side surface of the rear cover.

2. The back cover construction for a positive displacement flowmeter as recited in claim 1 wherein, The axial depth of the recess structure is 0.5mm-2mm.

3. The back cover construction for a positive displacement flowmeter as recited in claim 1 wherein, A through hole is formed on the outer side surface of the rear cover and communicates with the shaft hole, and a transparent piece is sealingly connected in the through hole.

4. The back cover construction for a positive displacement flowmeter as recited in claim 3, wherein, The transparent piece is detachably connected in the through hole.

5. The back cover construction for a positive displacement flowmeter as recited in claim 4, wherein, The transparent piece comprises a nut fixedly connected with a stud, the stud is threadedly connected with the through hole, and the stud and the nut are axially provided with a through hole, and a transparent part is arranged in the through hole to seal the through hole.

6. The back cover construction for a positive displacement flowmeter as recited in claim 5, wherein, The transparent part is a transparent block embedded in the through hole.

7. The back cover construction for a positive displacement flowmeter as recited in claim 5, wherein, A ring groove is formed on the side of the nut towards the stud, and a sealing ring is arranged in the ring groove.

8. The back cover construction for a positive displacement flowmeter as recited in claim 3, wherein, The rear cover is provided with at least two shaft holes.

9. The back cover construction for a positive displacement flowmeter as recited in claim 8, wherein, The rear cover is provided with at least one through hole.

10. A positive displacement flowmeter characterized by, A rear cover structure of a waist wheel flowmeter comprising any one of claims 1-9.

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